WO2014049695A1 - Optical information recording medium, optical information recording/replaying method, and optical information recording/replaying device - Google Patents

Description

Optical information recording medium, optical information recording and reproducing method, and optical information recording and reproducing apparatus

The present invention relates to a recording medium on which information is recorded using holography, and a recording and reproducing apparatus and a recording method therefor.

At present, the Blu-ray Disc (TM) standard using a blue-violet semiconductor laser has made it possible to commercialize an optical disc having a recording capacity of about 50 GB even for consumer use. In the future, it is desirable to increase the capacity of optical disks to the same extent as the capacity of an HDD (Hard Disk Drive) of 100 GB to 1 TB.

However, in order to realize such a large capacity in an optical disc, a new densification technology by a new method different from the densification technology by shortening the wavelength and increasing the objective lens NA is required.

While research on next-generation storage technology is being conducted, hologram recording technology that records digital information using holography is drawing attention.

In the hologram recording technology, signal light having information of page data two-dimensionally modulated by the spatial light modulator is superimposed on the reference light inside the recording medium, and the interference fringe pattern generated at that time is superimposed in the recording medium. This is a technology for recording information on a recording medium by causing refractive index modulation.

When reproducing information, when the recording medium is irradiated with the reference light used for recording, the hologram recorded in the recording medium acts like a diffraction grating to generate diffracted light. The diffracted light is reproduced as the same light including the recorded signal light and phase information.

The reproduced signal light is two-dimensionally detected at high speed using a photodetector such as a CMOS or a CCD. Thus, the hologram recording technology enables two-dimensional information to be recorded on the optical recording medium at once by one hologram, and further to reproduce this information, and a plurality of recording mediums are present at a plurality of places. Since the page data of can be overwritten, it is possible to perform large-capacity and high-speed recording and reproduction of information.

As a hologram recording technology, there is, for example, JP-A-2004-272268 (Patent Document 1). Patent Document 1 discloses a multiplexing method and apparatus in which the holograms are spatially multiplexed by partial spatial overlap between adjacent stacks of holograms. Each stack is, for example, an angle, a wavelength, The full advantage of another multiplexing technique such as phase code, peristotropic, or fractal multiplexing may be further taken, an amount equal to the beam waist of the signal light writing the hologram separates the individual stacks of the hologram. A certain hologram and the hologram adjacent to the hologram are all read out at the same time.By placing a filter at the beam waist of reproduced data, the read adjacent hologram is not transmitted to the camera plane or , These unwanted reproductions of optics with limited angular passbands In is described as may be filtered. "By the intermediate plane of the angular filter.

Further, examples of methods for providing address information representing a hologram recording position are described in Japanese Patent Application Laid-Open Nos. 2007-41329 (Patent Document 2) and 2010-85582 (Patent Document 3), respectively.

In Patent Document 2, “a hologram recording method for multiplexly recording a hologram corresponding to the angle of the reference light in a page unit by variably controlling the angle of the reference light with respect to the signal light for each stack serving as a unit irradiation area; When multiple page data are multiplexed and recorded as a different hologram for each page to any one of the stack, a stack address indicating the position of the stack on the hologram recording medium corresponding to each page data is used. It is described that "it records".
Patent Document 3 shows an example in which a recording position in the circumferential direction is determined using a detection mark provided on the inner peripheral side of a recording medium.

JP 2004-272268 A JP 2007-41329 A JP, 2010-85582, A

In the example of Patent Document 2, since the address information is recorded in the page data, this type of address information can not be read out on the medium before the page data is recorded. For this reason, there is a problem that another address information is required to determine the position of page data to be recorded first.

In the example of Patent Document 3, there is a problem that the recording position changes depending on the device.

In this example, the position in the circumferential direction is determined using the detection mark attached on the inner circumferential side, but a medium rotation angle detection sensor for detecting the detection mark and a pickup for forming a hologram in the medium Are provided individually. Therefore, the rotational angle position at which the hologram is formed is shifted relative to the position detected by the medium rotation angle detection sensor by the relative position therebetween. This relative position differs depending on the arrangement of parts of the recording and reproducing apparatus, assembly accuracy, and the like, so that even if the hologram is recorded with the same rotational angle detection amount, the recording position is changed by the apparatus.

It is an object of the present invention to record page data in the same position regardless of the apparatus for recording even in the medium in which the page data is not recorded, and to promptly transmit the signal light to the same position even when reproducing. An optical information recording medium, an optical information recording and reproducing method, and an optical information recording and reproducing apparatus, which make it possible to position the

The above problem is solved, for example, by the invention described in the claims.

According to the present invention, even in a medium in which page data is not recorded, page data can be recorded at the same position regardless of the recording apparatus.

Problems, configurations, and effects other than those described above will be apparent from the description of the embodiments below.

Schematic showing an embodiment of the optical information recording medium according to the present invention Schematic showing an embodiment of an optical information recording and reproducing apparatus according to the present invention Schematic showing an embodiment of a pickup in an optical information recording and reproducing apparatus according to the present invention Schematic showing an embodiment of a pickup in an optical information recording and reproducing apparatus according to the present invention Schematic diagram of the processing flow of the optical information recording and reproducing apparatus according to the present invention Schematic showing an embodiment of the optical information recording medium according to the present invention The figure which showed an example of the position reference mark of the optical information recording medium according to this invention The figure which showed another example of the position reference mark of the optical information recording medium according to this invention. First Example of Optical System for Pickup, Signal Light, and Reference Pattern Detection at the Position Reference Pattern Determination According to the Present Invention Second Example of Optical System for Pickup, Signal Light, and Reference Pattern Detection at the Position Reference Pattern Determination According to the Present Invention Third Example of Optical System for Pickup, Signal Light, and Reference Pattern Detection at the Position Reference Pattern Determination According to the Present Invention Schematic diagram showing the configuration of a reference rotation angle detection unit according to the present invention and the periphery thereof The figure showing the internal signal of the reference | standard rotation angle detection part at the time of position reference pattern discrimination | determination according to this invention. Schematic diagram showing the configuration of a reference rotation angle detection unit according to the present invention and the periphery thereof A schematic diagram showing the configuration of a slider unit, a slider movement amount detection unit, and the periphery thereof according to the present invention Flow chart of processing for obtaining correction amount of rotation angle according to the present invention Flow chart of processing for guiding signal light to target position according to the present invention Flow chart of processing for obtaining the correction amount of the rotation angle and the correction amount of the radial position according to the present invention Flow chart of processing for guiding signal light to target position according to the present invention Flow chart of processing for obtaining the correction amount of the rotation angle and the correction amount of the radial position according to the present invention Flow chart of processing for guiding signal light to target position according to the present invention Flow chart of processing for obtaining correction amount of rotational axis deviation of slider unit according to the present invention A schematic diagram showing the configuration of a slider unit, a slider movement amount detection unit, and the periphery thereof according to the present invention

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First, the configuration of the optical information recording and reproducing apparatus common to the respective embodiments and the outline of the processing thereof will be described, and then the detailed embodiment of the present invention will be described.

An embodiment of the present invention will be described according to the attached drawings.
FIG. 2 is a block diagram showing a recording and reproducing apparatus of an optical information recording medium which records and / or reproduces digital information using holography.

The optical information recording / reproducing device 10 is connected to an external control device 91 via an input / output control circuit 90. In the case of recording, the optical information recording / reproducing apparatus 10 receives an information signal to be recorded from the external control device 91 by the input / output control circuit 90. In the case of reproduction, the optical information recording and reproducing apparatus 10 transmits the reproduced information signal to the external control apparatus 91 by the input / output control circuit 90.

The optical information recording / reproducing apparatus 10 includes a pickup 11, a reference light optical system 12 for reproduction, a cure optical system 13, an optical system 14 for detecting a disc rotation angle, a slider 92, an optical system 94 for reference pattern detection, and a reference rotation angle detection unit The optical information recording medium 1 is configured to be rotatable by the rotation motor 50. In addition, the rotary motor 50 is installed in the slider portion 92. The optical system 94 for reference pattern detection and the reference rotational angle detection unit 98 are provided, and correction of the target displacement amount of the rotary motor 50 and the slider unit 92 can be performed based on the signals obtained using these, it is the present embodiment. It is a feature of the form.

The pickup 11 plays a role of emitting reference light and signal light to the optical information recording medium 1 and recording digital information on the recording medium using holography. At this time, an information signal to be recorded is sent by the controller 89 to the spatial light modulator in the pickup 11 via the signal generation circuit 86, and the signal light is modulated by the spatial light modulator.

When reproducing information recorded in the optical information recording medium 1, a light wave causing the reference light emitted from the pickup 11 to be incident on the optical information recording medium 1 in the opposite direction to that at the time of recording is transmitted to the reproduction reference light optical system 12. Generate. A reproduction light reproduced by the reproduction reference light is detected by a photodetector in the pickup 11 described later, and a signal processing circuit 85 reproduces a signal.

The irradiation time of the reference light and the signal light irradiated to the optical information recording medium 1 can be adjusted by controlling the open / close time of the shutter in the pickup 11 by the controller 89 via the shutter control circuit 87.

The cure optical system 13 plays a role of generating a light beam used for pre-cure and post-cure of the optical information recording medium 1. The pre-cure is a process prior to irradiating a predetermined light beam before irradiating the reference light and the signal light to the desired position when recording information at the desired position in the optical information recording medium 1. The post cure is a post-process in which after recording information at a desired position in the optical information recording medium 1, a predetermined light beam is irradiated to make the desired position non-rewritable.

The disc rotation angle detection optical system 14 is used to detect the rotation angle of the optical information recording medium 1. When adjusting the optical information recording medium 1 to a predetermined rotation angle, the disc rotation angle detection optical system 14 detects a signal corresponding to the rotation angle, and the controller 89 acquires the detected signal, and uses this The rotation angle of the optical information recording medium 1 is controlled via the disk rotation motor control circuit 88.

A predetermined light source drive current is supplied from the light source drive circuit 82 to the light sources in the pickup 11, the cure optical system 13, and the rotation angle detection optical system 14, and each light source emits a light beam with a predetermined light amount. it can.

The slider unit 92 is provided with a mechanism capable of sliding the positions of the rotary motor 50 and the optical information recording medium 1, and position control is performed from the controller 89 via the access control circuit 81. As a result, the radial position of the light spot irradiated from the pickup 11 and the curing optical system 13 to the optical information recording medium 1 can be moved. The slider movement amount detection unit 93 is for measuring the movement amount of the slider, and is connected to the controller 89. The controller 89 can obtain the movement amount of the slider via the slider movement amount detection unit 93.

The reference pattern detection optical system 94 is an optical system for detecting the position reference pattern 105 provided on the optical information recording medium 1 as described later. The position reference pattern is detected by detecting the intensity of the return light (reflected light or transmitted light) of the laser light emitted from the pickup 11 through the same optical path as the signal light.

The reference rotation angle detection unit 98 detects the rotation angle in the state where the signal light is positioned on the position reference pattern 105 based on the output of the reference pattern detection optical system 94 and the output of the rotation angle detection optical system 14. It is a part for obtaining the output of the optical system 14 and obtaining reference rotation angle information 97 representing the relationship between the rotation angle position at which the signal light is positioned and the rotation angle detected by the rotation angle detection optical system 14.

Also. The controller 89 is connected to the program memory 95, and performs processing based on the program code stored therein, and can store data obtained by the processing in the data memory 96 and read stored values. is there. In this embodiment, the data memory 96 stores and reads out the reference rotation angle information 97. Furthermore, the controller 89 is connected to each of the detection units including the rotation angle detection optical system 14, the slider movement amount detection unit 93, and the reference pattern detection optical system 94. These detected results can be obtained through a register, an input port, and an interrupt signal port.

By the way, the recording technology using the principle of angular multiplexing of holography tends to have a very small tolerance for the deviation of the reference beam angle.
Therefore, a mechanism for detecting the amount of deviation of the reference light angle is provided in the pickup 11, the servo signal generation circuit 83 generates a signal for servo control, and the amount of deviation is corrected via the servo control circuit 84. Preferably, the optical information recording and reproducing apparatus 10 includes a servo mechanism for

Further, the pickup 11, the cure optical system 13, and the optical system 14 for detecting the disc rotation angle may be simplified by combining some optical system configurations or all the optical system configurations into one.

FIG. 3 shows the recording principle in an example of the basic optical system configuration of the pickup 11 in the optical information recording and reproducing apparatus 10. As shown in FIG. The light beam emitted from the light source 301 passes through the collimator lens 302 and is incident on the shutter 303. When the shutter 303 is open, after the light beam passes through the shutter 303, the light amount ratio of p-polarized light to s-polarized light becomes a desired ratio by the optical element 304 formed of, for example, a half wavelength plate. After the polarization direction is controlled, the light enters a PBS (Polarization Beam Splitter) prism 305.

The light beam transmitted through the PBS prism 305 acts as a signal light 306, and after the diameter of the light beam is expanded by the beam expander 308, the light beam is transmitted through the phase mask 309, the relay lens 310 and the PBS prism 311 to obtain the spatial light modulator 312. Incident to

The signal light 306 to which information is added by the spatial light modulator 312 is reflected by the PBS prism 311, and propagates through the relay lens 313 and the spatial filter 314. Thereafter, the signal light 306 is condensed on the optical information recording medium 1 by the objective lens 315.

On the other hand, the light beam reflected by the PBS prism 305 acts as the reference beam 307 and is set to a predetermined polarization direction according to the time of recording or reproduction by the polarization direction conversion element 316, and then galvano via the mirror 317 and the mirror 318. The light is incident on the mirror 319. The angle of the galvano mirror 319 can be adjusted by the actuator 320, so that the incident angle of the reference beam 307 incident on the optical information recording medium 1 after passing through the lens 321 and the lens 322 can be set to a desired angle. In order to set the incident angle of the reference beam 307, an element for converting the wavefront of the reference beam 307 may be used instead of the galvano mirror.

As described above, by causing the signal light 306 and the reference light 307 to be incident on the optical information recording medium 1 so as to overlap each other, an interference fringe pattern is formed in the recording medium, and this pattern is written on the recording medium. Record Further, since the incident angle of the reference beam 307 incident on the optical information recording medium 1 can be changed by the galvano mirror 319, recording by angle multiplexing is possible.

Hereinafter, in holograms recorded with different reference beam angles in the same area, a hologram corresponding to each reference beam angle will be called a page, and a set of angle-multiplexed pages in the same area will be called a book. .

FIG. 4 shows the principle of reproduction in an example of the basic optical system configuration of the pickup 11 in the optical information recording and reproducing apparatus 10. As shown in FIG. When reproducing the recorded information, as described above, the reference beam 307 is incident on the optical information recording medium 1, and the light beam transmitted through the optical information recording medium 1 is adjusted by the galvano mirror 324 by the actuator 323. The reflection generates the reproduction reference light.

The reproduction light reproduced by the reproduction reference light propagates through the objective lens 315, the relay lens 313, and the spatial filter 314. Thereafter, the reproduction light passes through the PBS prism 311 and is incident on the light detector 325 so that the recorded signal can be reproduced. For example, an imaging element such as a CMOS image sensor or a CCD image sensor can be used as the light detector 325, but any element may be used as long as page data can be reproduced.

FIG. 5 shows an operation flow of recording and reproduction in the optical information recording and reproducing apparatus 10. Here, a flow relating to recording and reproduction using holography in particular will be described.

FIG. 5 (a) shows an operation flow until the preparation for recording or reproduction is completed after the optical information recording medium 1 is inserted into the optical information recording / reproducing apparatus 10, and FIG. 5 (b) is a light from the preparation completed state. FIG. 5C shows an operation flow until information is recorded on the information recording medium 1, and FIG. 5C shows an operation flow from reproduction ready to reproduction of the information recorded on the optical information recording medium 1.

When the medium is inserted as shown in FIG. 5 (a), the optical information recording / reproducing apparatus 10 determines whether the inserted medium is a medium for recording or reproducing digital information using holography, for example. Perform (502).

As a result of disc discrimination, when it is determined that the optical information recording medium 1 is to record or reproduce digital information using holography, the optical information recording and reproducing apparatus 10 reads control data provided on the optical information recording medium 1 (503) For example, information on the optical information recording medium 1, and information on various setting conditions at the time of recording and reproduction, for example, are acquired.

After reading the control data, various adjustments according to the control data and a learning process related to the pickup 11 are performed (504), and the optical information recording and reproducing apparatus 10 completes preparation for recording or reproduction (505).

As shown in FIG. 5 (b), the operation flow from the ready state to the recording of information first receives data to be recorded (511), and the spatial light modulator in the pickup 11 receives the information according to the data Send to

Thereafter, various recording learning processes such as optimization of the power of the light source 301 and optimization of the exposure time by the shutter 303 are performed in advance, as necessary, so that high-quality information can be recorded on the optical information recording medium 1 512).

After that, in the seek operation (513), the slider portion 92 is controlled via the access control circuit 81 to position the irradiation position of the light spot from the pickup 11 and the cure optical system 13 at a predetermined position of the optical information recording medium 1. .

Thereafter, a predetermined area is precured using the light beam emitted from the curing optical system 13 (514), and data is recorded using the reference light 307 and the signal light 306 emitted from the pickup 11 (515).

After the data is recorded, post curing is performed using the light beam emitted from the curing optical system 13 (516). Data may be verified as needed.

As shown in FIG. 5C, the operation flow from the ready state to the reproduction of the recorded information is first the seek operation (521), and the reference light optical system 12 for reproduction and the slider via the access control circuit 81. The unit 92 is controlled to position the position of the light spot irradiated from the pickup 11 and the reproduction reference light optical system 12 at a predetermined position of the optical information recording medium 1.

Thereafter, the reference beam 307 is emitted from the pickup 11, the information recorded in the optical information recording medium 1 is read out (522), and the reproduction data is transmitted (513).

Next, an example of the configuration of the slider portion 92, the slider movement amount detection portion 93, and the periphery thereof in the embodiment described below will be described with reference to FIG.

The slider portion 92 includes a slider fixing portion 92a and a slider moving portion 92b. The slider movement amount detection unit 93 includes a slider movement amount gauge 93a and a slider movement amount detection optical system 93b. Reference numeral 92a denotes a slider fixing portion, which is a portion of the slider portion 92 fixed to the housing of the optical information recording and reproducing apparatus. Reference numeral 92 b denotes a slider moving portion, which is a portion of the slider 92 that is linearly displaced with respect to the slider fixing portion 92 a. There are methods of displacing, for example, a motor (not shown) controlled by the access control circuit 81 and a method of providing a displacement amount proportional to the rotation angle of the motor through a ball screw mechanism driven by this.

93a is a slider movement gauge. Reference numeral 93b denotes a slider movement amount detection optical system. The slider movement amount detection optical system 93 b has a light source for emitting light and a light detector for detecting the return light intensity, and is mounted on the slider movement unit 92 b. The stopper 99 limits the moving range of the slider moving part 92b. For example, at the end of the movement range, the signal light 306 is provided to be positioned in the buffer area 103 (described later) on the optical information recording medium 1. On the slider moving part 92b, the rotation angle detection optical system 14 and the rotation motor 50 are also mounted. The rotation angle detection optical system 14 determines the installation position so as to irradiate light to the radius range where the rotation angle detection pattern 102 on the optical information recording medium 1 exists. Further, the optical information recording medium 1 is held by the rotary motor 50, and the signal light 306 emitted from the pickup 11 is irradiated.

On the other hand, the slider moving amount gauge 93a is mounted on the slider fixing portion 92a, and disposed so as to irradiate the light emitted from the slider moving amount detecting optical system 93b across the entire movable range of the slider moving portion 92b. Ru. Further, the slider movement gauge 93a is provided with a pattern in which light returning to the slider movement detection optical system 93b changes according to the displacement along the movable direction of the slider movement part 92b. It is possible to obtain the amount of displacement of the slider moving part 92b by detecting.

Here, the angle θ shown in the lower part of FIG. 23 is a difference between the rotation angle position to which the signal light 306 is irradiated and the rotation angle position detected by the rotation angle detection optical system 14. The angle θ is 0 when the rotation angle detection optical system 14 is provided without any error on a straight line passing through the center of the rotary motor 50 and the position where the signal light 306 is irradiated. However, in order to avoid mechanical interference with other parts, it may be arranged at another position. In addition, the position is also shifted due to the tolerance at the time of assembly. Due to such a factor, the angle θ is not necessarily 0, and the position of the signal light 306 can not be determined only by the rotational angle position detected by the rotational angle detection optical system 14.

Similarly, the relative displacement of the slider portion and the signal light 306 can be obtained by using the slider movement detection optical system 93b, but the signal light 306 is irradiated due to an error factor including the displacement at the time of assembly. Variations in the radial position on the optical information recording medium 1 occur among the recording and reproducing devices.

Therefore, by applying an optical information recording medium, an optical information recording and reproducing method, and an optical information recording and reproducing apparatus as described below, the signal light 306 is positioned promptly at the same position regardless of the apparatus performing recording and reproduction. Make it possible.

Hereinafter, embodiments of the optical information recording medium, the optical information recording and reproducing method, and the optical information recording and reproducing apparatus will be described in detail.

A first embodiment of an optical information recording medium 1 according to the present invention will be described with reference to FIG.
(A), (b), (c), (d), (e) and (f) are examples of the optical information recording medium 1 respectively.
In any of these figures, the center hole 101, the rotational angle detection pattern 102, the buffer area 103, the recording radius area 104, and the position reference pattern 105 are provided, but the order of the radial positions at which these are arranged is It is different.
The optical information recording medium 1 has a disk shape having a center hole 101 at the center.
The center hole 101 is connected to the rotary shaft of the rotary motor 50 of the optical information recording / reproducing apparatus 10, and is positioned around the center of the board to position the laser light at a rotational angle at which recording and reproduction are performed.
The recording radius area 104 is a radius area for forming a hologram and recording data.

The rotation angle detection pattern 102 is a pattern provided on the medium to detect the rotation angle amount of the disk, and is provided on the entire circumference of a concentric circle centered on the center hole 101. The rotation angle detection pattern 102 has a physical structure such that a signal corresponding to the rotation angle amount of the irradiation position is detected when the light is irradiated onto this pattern and the intensity of the return light is detected. For example, it comprises a relative rotation angle pattern in which a structure in which the intensity of return light decreases and a structure in which the intensity of return light increases at a constant rotation angle interval is repeated and a reference rotation angle pattern provided at a specific angular position. It is preferable that the rotational angle detection pattern 102 be provided separately from the recording radius area 104, whereby the deterioration of the recording quality and the reproduction signal quality in the recording radius area 104 can be suppressed. With such a rotational angle detection pattern 102, it is possible to find the angular position at which the light spot irradiated with light on the pattern exists over the entire angular range.
The buffer area 103 is provided as an area not used for data recording, while being arranged in a radius area close to the recording radius area 104, the buffer area 103 is disposed in a radius range where the signal light 306 can be irradiated. There is.
The buffer region 103 may or may not contain a material for forming a hologram. Moreover, the physical structure used for another purpose may be provided in the range which does not impair the effect of a present Example.
Such a buffer area 103 is secured as a radius range within which the signal light 306 can be irradiated without affecting the data recording / reproducing quality regardless of the rotation angle around the center hole 101. In the buffer area 103, recording of data (user data) to be transferred to the external control device 91 via the input / output control circuit 90 according to a reproduction request of data from the external control device 91 is not performed. Recording may be performed as long as it is used only for internal processing of the optical information recording and reproducing apparatus 10, such as a pattern for recording power adjustment and data used for processing specific to the model of the optical information recording and reproducing apparatus 10. .

In both of the optical information recording media shown in FIGS. 1A and 1D, buffer areas 103 are provided on both the inner and outer circumferential sides of the recording radius area 104, respectively. In the medium shown in FIG. 1A, the rotational angle detection pattern 102 is provided on the inner circumferential side further than the recording radius area 104 and the buffer area 103 provided on the inner circumferential side. In the medium shown in d), the rotational angle detection pattern 102 is provided further on the outer peripheral side than the recording radius area 104 and the buffer area 103 provided on the outer peripheral side.
In both the optical information recording media shown in FIGS. 1B and 1E, a buffer area 103 is provided on the inner peripheral side of the recording radius area 104. In the medium shown in FIG. 1 (b), the rotational angle detection pattern 102 is provided further inward than the recording radius area 104 and the buffer area 103, while the medium shown in FIG. 1 (d) is used for recording. The rotation angle detection pattern 102 is provided further on the outer peripheral side than the radius area 104 and the buffer area 103.
In both of the optical information recording media shown in FIGS. 1C and 1F, the buffer area 103 is provided on the outer peripheral side of the recording radius area 104. In the medium shown in FIG. 1C, the rotational angle detection pattern 102 is provided further inward than the recording radius area 104 and the buffer area 103. On the other hand, the medium shown in FIG. The rotation angle detection pattern 102 is provided further on the outer peripheral side than the radius area 104 and the buffer area 103.

Further, in any of the optical information recording media of FIGS. 1A, 1B, 2C, 2D, 2E, and 2F, a specific rotation angle of the rotation angle detection pattern 102. , The position reference pattern 105 is disposed along the radial direction. Further, the position reference pattern 105 is provided so as not to be interrupted over the entire radius range of the buffer area 103. That is, one end of the position reference pattern 105 is provided on the inner peripheral side relative to the inner peripheral boundary of the buffer area 103, and the opposite end is provided on the outer peripheral side beyond the outer peripheral boundary of the buffer area 103. I try not to break. In the example illustrated in FIGS. 1A and 1D, the position reference patterns 105 on the inner circumferential side and the outer circumferential side are separated, but even if they are integrated through the recording radius area 104 Good. In the optical information recording medium 1 having the rotation angle detection pattern 102 as described above, when the signal light 306 is positioned within the radius range of the buffer area 103, the signal can be generated during one rotation around the center hole 101. It is ensured that the light 306 always passes over the position reference pattern 105.

The position reference pattern 105 is formed of a structure having a reflectance or transmittance different from that of the other areas in the recording radius area 104. In order to realize the reflectance different from that of the other regions, for example, the position reference pattern 105 may be formed of a suitable metal film. In order to obtain transmittance different from that of other regions, for example, a material having different absorptivity for light of a wavelength incident upon recording may be used as compared with the material of the other regions. Alternatively, the position reference pattern 105 may be formed by a reflective or transmissive diffraction grating, and the diffracted light may be used. The angle of the diffracted light with respect to the medium can be varied by the pitch of the diffraction grating, thus providing flexibility in the placement of the components of the device. When such a position reference pattern 105 is provided, the signal light 306 is incident within the radius range of the buffer area 103 of the optical information recording medium 1, and the reflected light or transmitted light / diffracted light (collectively described below) while changing the rotation angle. It is possible to determine whether the signal light 306 is positioned on the position reference pattern 105 by detecting a change in the intensity of the return light). The spot diameter decreases as the focus position of the signal light 306 gets closer, and high accuracy is obtained. Therefore, the position where the position reference pattern 105 is provided in the thickness direction of the optical information recording medium 1 matches the focus position of the signal light 306. It is desirable to
According to the optical information recording medium 1 described in the first embodiment described above, positioning at the rotation angle at which the signal light 306 is irradiated onto the position reference pattern 105, and from the rotation angle detection pattern 102 at that time It is possible to obtain a detected rotation angle (hereinafter referred to as rotation angle offset). When recording in the recording radius area 104, the difference between the rotation angle detected from the rotation angle detection pattern 102 and the rotation angle offset is determined, whereby the signal light 306 is emitted based on the position reference pattern 105. Therefore, even in a medium where page data is not recorded, the signal light 306 can be promptly positioned at the same rotation angle position regardless of the recording and reproducing apparatus. can get.

A second embodiment of the optical information recording medium 1 according to the present invention will be described with reference to FIG.
In the optical information recording medium 1 of the first embodiment, it is assumed that the rotational angle offset can be regarded as constant regardless of the radial position where the signal light 306 is irradiated. However, it may also differ depending on the radial position to which the signal light 306 is irradiated. The irradiation position of the signal light 306 is ideally moved along the radial direction of the optical information recording medium 1 by the slider 92, but when a shift occurs in the moving direction of the slider 92, the irradiation position of the signal light 306 is Apart from the radial direction, the rotational angle offset changes according to the radial position of the signal light 306 irradiated.

In the optical information recording medium 1 according to the second embodiment, even when the light beam 306 is different depending on the radial position irradiated with the signal light 306, page data can be recorded at the same position regardless of the recording apparatus. I assume.

FIGS. 6A and 6B are both examples of the optical information recording medium 1 according to the present invention. In each of the optical information recording medium 1 shown in FIG. 1A and FIG. 1D, the position reference pattern 105 is integrated from the buffer area 103 on the inner side to the buffer area 103 on the outer side. The reference pattern peripheral buffer area 106 is provided in the rotation angle range around the position reference pattern 105.
First, by providing the buffer areas 103 on both the inner and outer circumferential sides, it is possible to detect the rotational angle offset at each radial position that sandwiches the recording radius area 104. Furthermore, the rotational angle offset at the radial position in between can be estimated by interpolation.

Next, by integrating the buffer area 103 on the outer peripheral side, the rotational angle offset can be located anywhere within the radius range in which the position reference pattern 105 including the recording radius area 104 exists. Can be determined. At this time, the signal light 306 is also irradiated around the position reference pattern 105. However, if the irradiation position of the signal light 306 is determined using the rotation angle offset estimated by interpolation as described above, the recording radius In the area 104, there is no need to provide an area where data recording is not performed over the entire circumference like the buffer area 103, and data recording is performed only in the rotation angle range around the position reference pattern 105 like the reference pattern peripheral buffer area 106. You should not make it.

According to the optical information recording medium 1 described in the second embodiment described above, even when the light beam 306 is different depending on the radial position irradiated with the signal light 306, the signal light can be promptly transmitted to the same position regardless of the apparatus performing recording. The effect of enabling positioning of 306 is obtained.

A third embodiment of the optical information recording medium 1 according to the present invention will be described with reference to FIG.
FIG. 7 shows a first embodiment of the position reference pattern 105 in the optical information recording medium 1 according to the present invention. Although a rectangular shape is shown here for simplification of illustration, it is more desirable to use a fan-like shape that is expanded in the circumferential direction in proportion to the radial position. In FIG. 7, the longitudinal direction represents the radial direction, and the lateral direction represents the circumferential direction.
The first aspect of the third embodiment of the optical information recording medium 1 will be described.

The black-painted area in FIG. 7 is the main area of the position reference pattern 105, and is formed with a structure having a reflectance or transmittance different from that of the other areas in the recording radius area 104. .
On the other hand, the position of white arranged in the black-painted area in the figure is formed in a structure that can provide return light different in intensity from the main area of the position reference pattern 105. For example, the same structure as the periphery of the position reference pattern 105 (the same as the area in which data recording is performed) may be performed.

Further, in FIG. 7, 701 is a marker, 702 is radial position information, and 703 is a 1-bit recording area. The radial position information 702 is arranged so as to have a fixed distance in the radial direction in the range of the recording radius area 104. The radial position information 702 thus provided can be detected by the change in intensity of the return light of the signal light 306, and the signal is obtained by counting the radial position information 702 detected while moving the signal light 306. It is possible to measure the travel distance of the light 306. Furthermore, by comparing the movement distance of the signal light 306 with the movement target amount of the slider, it is possible to correct the movement target amount thereafter and lead the signal light 306 to an accurate radial position.

Next, the second aspect of the optical information recording medium 1 will be described.
In this optical information recording medium, in addition to the configuration of the optical information recording medium of the first aspect described above, the radial interval for providing the radial position information 702 is defined to be the same as the radial interval for recording the book. In this way, the optical information recording medium 1 is rotated at the radial position where the signal light 306 is guided to the radial position where the radial position information 702 corresponding to the book to be recorded is detected, and the signal light 306 is irradiated. By adjusting to the rotation angle, it is possible to obtain the effect that the irradiation position of the signal light 306 can be accurately and easily determined.

Next, the third aspect of the optical information recording medium 1 will be described.

In this example, the radial position information 702 is represented by 1-bit recording areas 703 arranged in the circumferential direction such that the rotational angle positions are equally spaced, and data patterns differ depending on the arranged radial positions. In FIG. 7, assuming that the 1-bit recording area 703 shown in black is “0” and the 1-bit recording area 703 shown in white is “1” data, the radius position information 702 is obtained by arranging these data. It is formed. In this way, the radius on the optical information recording medium 1 to which the signal light 306 is irradiated from the radial position information 702 determined using the signal light 306 as well as the movement distance which can be determined in the first mode An effect is obtained that makes it possible to determine the position itself.

Next, the fourth embodiment of the optical information recording medium 1 will be described.
In this example, markers 701 are arranged at both ends of the radial position information 702 in the second and third embodiments described above, and the markers 701 are provided at the same rotational angle position also in the buffer area 103. Added points.
The marker 701 is provided as a reference indicating the rotational angular position at which the radial position information 702 starts and ends and the radial position at which the radial position information 702 exists. In the example of FIG. 7, the markers 701 in the buffer area 103 are not interrupted in the radial direction. As a result, if the signal light 306 is positioned in the radius range of the buffer area 103 and the optical information recording medium 1 is rotated, the marker 701 can always be detected. Furthermore, if the rotational direction is determined based on the position where the marker 701 is detected in the buffer area 103 and the radial direction is moved, the marker 701 in the recording radius area 104 can be easily detected.
In the example of FIG. 7, the markers 701 are provided at the rotational angle positions of both ends of the radial position information 702, but this makes it possible to use the other one when a defect occurs in one. In addition, by setting the marker 701 determined to be close to the irradiation position of the signal light 306 as a detection target, it is possible to reduce the time required for the detection. On the other hand, if these effects can not be obtained, the marker 701 may be placed only on one side of the radial position information 702.

In this manner, in the state where the marker 701 in the recording radius area 104 is detected, the radial position information 702 can be obtained by detecting the change in the intensity of the return light to the signal light 306 while changing the rotation angle. The effect of determining the irradiating radial position 306 is obtained.

If the size of the marker 701 in the radial direction is larger than the size of the radial position information 702 in the radial direction, the radial position information 702 may not be detected even though the marker 701 can be detected. Therefore, the radial size of the marker 701 is preferably equal to or smaller than the radial size of the radial position information 702.

According to the optical information recording medium 1 having the position reference pattern 105 shown in FIG. 7 described above, the radial position irradiated with the signal light 306 is detected using the radial position information 702 provided in the position reference pattern 105. It becomes possible. Since the rotational angle position to which the signal light 306 is irradiated is also determined as described in the first embodiment and the second embodiment, both the radial position and the rotational angle position for determining the position on the optical information recording medium 1 are determined. Can be obtained.

A fourth embodiment of the optical information recording medium 1 according to the present invention will be described with reference to FIG.

FIG. 8 shows a pattern different from the example shown in FIG. 7 of the position reference pattern 105 in the optical information recording medium 1 according to the present invention.
In the example of FIG. 7, the recording area 703 of 1 bit is arranged in the circumferential direction, but in the example of FIG. 8, the recording area 703 of 1 bit is arranged in the radial direction.

In addition, although it represents with a rectangle here for simplification of illustration, it is more desirable to set it as the fan shape which extends in the circumferential direction in proportion to a radial position similarly to what was shown in FIG. Similarly, in FIG. 8, the longitudinal direction represents the radial direction, and the lateral direction represents the circumferential direction.

In FIG. 8, a black area is a main area of the position reference pattern 105 and is formed to have a different reflectance or transmittance from the other areas in the recording radius area 104. There is.
On the other hand, the position of white arranged in the black-painted area in the figure is formed in a structure that can provide return light different in intensity from the main area of the position reference pattern 105. For example, the same structure as the periphery of the position reference pattern 105 (the same as the area in which data recording is performed) may be performed.

In FIG. 8, reference numeral 701 denotes a marker, 702 denotes radial position information, and 703 denotes a 1-bit recording area. The radial position information 702 is arranged so as to have a fixed distance in the radial direction in the range of the recording radius area 104. The radial position information 702 thus provided can be detected by the intensity change of the return light of the signal light 306, and the gap between the radial position information 702 or the radial position information 702 detected while moving the signal light 306 It is possible to measure the moving distance of the signal light 306 by counting the number of detections of. Furthermore, by comparing the movement distance of the signal light 306 with the movement target amount of the slider, it is possible to correct the subsequent movement target amount and guide the signal light 306 to the correct radial position.

Here, the radial interval for providing the radial position information 702 may be defined to be the same as the radial interval for recording the book. In this way, the optical information recording medium 1 is rotated at the radial position where the signal light 306 is guided to the radial position where the radial position information 702 corresponding to the book to be recorded is detected, and the signal light 306 is irradiated. By adjusting to the rotation angle, it is possible to obtain the effect that the irradiation position of the signal light 306 can be accurately and easily determined.

In the embodiment shown in FIG. 8, the radial position information 702 is represented by 1-bit recording areas 703 arranged in the circumferential direction so that the radial positions are equally spaced, and the data pattern varies depending on the arranged radial positions. And In FIG. 7, assuming that the 1-bit recording area 703 shown in black is “0” and the 1-bit recording area 703 shown in white is “1” data, the radius position information 702 is obtained by arranging these data. It is formed. By doing this, not only the moving distance which can be obtained in the form of claim 3 from the radial position information 702 determined using the signal light 306, but also the optical information recording medium 1 on which the signal light 306 is irradiated. The effect is obtained that makes it possible to determine the radius position itself of.
Further, the markers 701 may be disposed at both ends of the radial position information 702, and the markers 701 may be provided at the same rotational angle position also in the buffer area 103.

The marker 701 is provided as a reference indicating the rotational angular position at which the radial position information 702 starts and ends and the radial position at which the radial position information 702 exists. In the example of FIG. 8, the markers 701 in the buffer area 103 are not interrupted in the radial direction. As a result, if the signal light 306 is positioned in the radius range of the buffer area 103 and the optical information recording medium 1 is rotated, the marker 701 can always be detected. Further, after the rotational angle is determined based on the position where the marker 701 is detected in the buffer area 103, the radial direction is moved, and if a change in intensity of return light to the signal light 306 is detected, The effect is obtained that the marker 701 and the radial position information 702 connected thereto can be easily detected.

If the size of the marker 701 in the radial direction is larger than the size of the radial position information 702 in the circumferential direction, there may be cases where the radial position information 702 can not be detected even though the marker 701 can be detected. Therefore, it is desirable to make the circumferential size of the marker 701 equal to or smaller than the circumferential size of the radial position information 702.

In addition, a pattern in which areas representing “0” having a length close to the distance (indicated by X in the drawing) between the markers 701 on the side where the radial position information 702 is not sandwiched is a continuous pattern Do not exist. For example, if the radial position information 702 is made up of N bits of information, then X should be at least N + 1 bits long (not shown in FIG. 8 for simplicity of illustration). This is to enable discrimination of the radius area between the markers and the radius area of the radius position information 702 by measuring the length.

According to the optical information recording medium 1 having the position reference pattern 105 shown in FIG. 8 described above, the radial position irradiated with the signal light 306 is detected using the radial position information 702 provided in the position reference pattern 105. It becomes possible. Since the rotational angle position to which the signal light 306 is irradiated is also determined as described in the first embodiment and the second embodiment, both the radial position and the rotational angle position for determining the position on the optical information recording medium 1 are determined. Can be obtained.

An exemplary configuration of the optical information recording and reproducing apparatus 10 will be described below. The schematic configuration is as described above with reference to FIGS. 2, 3 and 4. Here, the characteristic configuration necessary for the present embodiment will be described. The optical information recording and reproducing apparatus 10 in the present embodiment targets the optical information recording medium 1 described in the first to fourth embodiments for recording and reproduction.

(First Embodiment of Reference Pattern Detection Optical System in Optical Information Recording and Reproducing Apparatus 10)
A first embodiment of the reference pattern detection optical system in the optical information recording and reproducing apparatus 10 is shown in FIG.
This form can be applied to the optical information recording medium 1 having the position reference pattern 105 of a structure having a different transmittance from that of the surroundings.
In the configuration of FIG. 9, the optical system 901 for transmitting light and signal light detection on the opposite side of the surface on which the signal light 306 is incident with respect to the configuration already shown in FIG. 3 and FIG. Further, a sensor 902 is added.
The optical information recording medium 1 is irradiated with a laser beam which follows the same optical path as the irradiation of the signal light 306 at the time of recording.

First, after the light beam emitted from the light source 301 passes through the shutter 303, the polarization state is adjusted by the optical element 304 formed of, for example, a half wavelength plate. The target of adjustment of the polarization state at this time is different from that during recording, and the polarization state is adjusted so that the ratio of the intensity of the signal light 306 to the intensity of the reference light 307 or the intensity itself of the signal light 306 becomes maximum. This is because, in the processing described below, the reference light is not used, and the output of the laser light emitted from the light source 301 is allocated to the signal light 306 as much as possible. Furthermore, since the reference light 307 may become noise in the following processing, a second shutter (not shown) may be provided between the path from the PBS prism 305 to the optical information recording medium 1 to block the reference light 307.

The signal light 306 transmitted through the PBS prism 305 is expanded in diameter by the beam expander 308, transmitted through the phase mask 309, the relay lens 310, and the PBS prism 311, and enters the spatial light modulator 312. At this time, the data pattern of the spatial light modulator 312 is the same modulation for all pixels (reflectance if the spatial light modulator 312 modulates the reflected light, transmittance if it modulates transmission type) To give. Since the intensity distribution of the light spot formed in the optical information recording medium 1 is a Fourier transform image of the two-dimensional pattern of the spatial light modulator 312, the light information recording medium 1 can be obtained by making it such a uniform pattern. It is possible to reduce the size of the light spot formed inside. In addition to the improvement in resolution when detecting the position reference pattern 105, the area of the position reference pattern 105 that can not be used for recording data can be miniaturized.

The signal light 306 that has passed through the spatial light modulator 312 is reflected by the PBS prism 311 and propagates through the relay lens 313 and the spatial filter 314. Thereafter, the signal light 306 is condensed on the position reference pattern 105 in the optical information recording medium 1 by the objective lens 315. The transmitted light 903 transmitted through the position reference pattern 105 is collected by the transmitted light optical system 901, and the intensity of the transmitted light 903 is detected using the signal light detection sensor 902. In this embodiment, the transmitted light optical system 901 and the signal light detection sensor 902 constitute a reference pattern detection optical system 94.

Since the position reference pattern 105 in the present embodiment has a structure in which the transmittance is different from that of the surroundings as described above, the transmitted light 903 is thus collected by the transmitted light optical system 901 and the signal light detection sensor 902 is used. From the intensity change of the transmitted light 903 to be obtained, the position reference pattern 105 and the markers 701 and the radial position information 702 arranged in the position reference pattern 105 can be detected.

(Second form of reference pattern detection optical system in optical information recording and reproducing apparatus)
A second embodiment of the reference pattern detection optical system in the optical information recording and reproducing apparatus 10 will be described with reference to FIGS. 10 and 11. FIG.
These forms can be applied to the optical information recording medium 1 having the position reference pattern 105 of a structure having a structure different from that of the surrounding, in particular.
In the configuration of FIG. 10, an optical information recording medium for the reflected light optical system 1001 and the signal light detection sensor 1003 instead of the transmitted light optical system 901 and the signal light detection sensor 902 is used in place of the configuration already shown in FIG. 1 is provided on the same side of the surface on which the signal light 306 is incident.

The optical path until the position reference pattern 105 in the optical information recording medium 1 in the present embodiment is irradiated with the signal light 306 is the same as that in the example of FIG.

The signal light 306 is condensed on the position reference pattern 105 in the optical information recording medium 1 by the objective lens 315. The reflected light 1002 reflected by the position reference pattern 105 is collected by the reflected light optical system 1001, and the intensity of the reflected light 1002 is detected using the signal light detection sensor 1003. In the present embodiment, a reference pattern detection optical system 94 is configured of the reflected light optical system 1001 and the signal light detection sensor 1003.

Since the position reference pattern 105 in the present embodiment has a structure in which the reflectance is different from that of the surroundings as described above, the reflected light 1002 is thus collected by the reflected light optical system 1001 and obtained using the signal light detection sensor 1003. The position reference pattern 105 and the markers 701 and the radial position information 702 disposed in the position reference pattern 105 can be detected from the intensity change of the reflected light 1002.
Further, the same effect as the configuration of FIG. 10 can be obtained also by the configuration of FIG.

In the configuration of FIG. 11, the function of focusing the reflected light on the signal light detection sensor 1003 carried by the reflected light optical system 1001 in the configuration of FIG. 10 is the three elements of the mirror 319, the lens 321 and the lens 322. The reference pattern detection optical system 94 is constituted by the four elements of the signal light detection sensor 1003, the mirror 319, the lens 321, and the lens 322. Since these elements are also used to control the reference beam 307, in addition to the effects of the example of FIG. 10, an effect of simplifying the configuration of the apparatus can be obtained.

(Example of reference rotation angle detection unit in optical information recording and reproducing apparatus)
Next, an example of the reference rotation angle detection unit 98 in the optical information recording and reproducing apparatus 10 will be described with reference to FIGS. 12 and 13. FIG. 12 shows a configuration example of the reference rotation angle detection means 98, and FIG. 13 shows its operation example.

12, reference rotation angle detection means 98 includes peak detection circuit 1201, bottom detection circuit 1202, threshold generation circuit 1203, comparison circuit 1204, edge detection circuit 1205, rotation angle detection circuit 1206, rotation angle detection value holding register. Each has 1207. The reference rotation angle detection means 98 receives signals detected by the reference pattern detection optical system 94 and the disc rotation angle detection optical system 14 as input, and the signals generated by the reference rotation angle detection means 98 are sent to the controller 89. Connected

The peak detection circuit 1201 and the bottom detection circuit 1202 respectively detect the peak level signal 1301 and the bottom level signal 1302 of the reference pattern detection signal 1394 detected by the reference pattern detection optical system 94. Also, based on the peak level signal 1301 and the bottom level signal 1302, the threshold generation circuit 1203 generates a threshold signal 1303 that has a level between them. The comparison circuit 1204 sequentially compares the amplitude levels of the reference pattern detection signal 1394 and the threshold signal 1303, and when the position reference pattern detection signal 1394 is larger than the threshold signal 1303, “1”, the reference pattern When the detection signal 1394 is smaller than the threshold signal 1303, a binarized reference pattern detection signal 1304 which is "0" is output. The edge detection circuit 1205 detects a change in polarity of the binarized reference pattern detection signal 1304, generates a pulse signal 1305 at the timing when the polarity changes, and supplies the pulse signal 1305 to the controller 89 and rotation angle detection value holding register 1207. .

The rotation angle detection circuit 1206 is a rotation that represents the rotation angle position of the light irradiated on the rotation angle detection pattern 102 by the disk rotation angle detection optical system 14 based on the signal from the disk rotation angle detection optical system 14. An angle detection value 1306 is generated. The rotation angle detection value holding register 1207 holds the value of the rotation angle detection value 1306 at the timing when the pulse signal 1305 is supplied, generates a rotation angle detection signal holding signal 1307, and enables the controller 89 to obtain it. The controller 89 reads the value of the rotation angle detection value holding register 1207 at the timing when the pulse signal 1305 is supplied, and obtains the rotation angle detection signal holding signal 1307. The rotation angle detection signal holding signal 1307 obtained in this manner becomes the reference rotation angle information 97.

In FIG. 13, an operation example is shown by taking as an example the case where the signal light 306 passes between the point A and the point B across the position reference pattern 105 shown in FIG. 13A. In each of FIGS. 13 (b), 13 (c), 13 (d), 13 (e) and 13 (f), the horizontal axis represents the rotation angle of the optical information recording medium 1. 13 (b), 13 (c) and 13 (d) represent the signal amplitude, and the vertical axes in FIGS. 13 (e) and 13 (f) represent the rotation angle detection circuit 1206. The rotation angle detection value 1306 is shown.

FIG. 13B shows a reference pattern detection signal 1394, its peak level signal 1301, its bottom level signal 1302, and its threshold signal 1303.
The signal levels of the peak level signal 1301 and the bottom level signal 1302 are at the same level as the maximum value and the minimum value of the reference pattern detection signal 1394, respectively. These levels are obtained, for example, by rotating the disk one turn with the signal light 306 positioned in the radius area of the buffer area 103 and detecting the maximum value and the minimum value of the reference pattern detection signal 1394 between them. It is preferable to obtain in advance before detection of the position reference pattern 105. The threshold signal 1303 is at an intermediate level between the peak level signal 1301 and the bottom level signal 1302. Here, the threshold signal 1303 is determined from the peak level signal 1301 and the bottom level signal 1302, but the relationship between the magnitudes of the peak level signal 1301 and the bottom level signal 1302 (for example, the amplitude ratio or the amplitude difference and their variations) is known. In this case, only one of the peak level signal 1301 and the bottom level signal 1302 may be detected, and the other may be estimated.

FIG. 13C shows a binarized reference pattern detection signal 1304. The amplitude levels of the reference pattern detection signal 1394 and the threshold signal 1303 are compared, and when the position reference pattern detection signal 1394 is larger than the threshold signal 1303, “1”, the reference pattern detection signal 1394 Becomes smaller than the threshold signal 1303. FIG. 13D shows a pulse signal 1305, and a pulse is generated at the timing when the polarity of the binarized reference pattern detection signal 1304 changes. FIG. 13E shows a rotation angle detection value 1306. The inclination (a ratio of the change amount of the rotation angle detection value to the change amount of the rotation angle of the optical information recording medium 1) is a straight line with respect to the rotation angle of the optical information recording medium 1. FIG. 13F shows the rotation angle detection signal holding signal 1307. At the timing when the pulse signal 1305 is generated, the rotation angle detection value 1306 at that timing is held until the timing when the next pulse signal 1305 is generated.

If the reference of the rotation angle is predetermined to one of the generation positions of the pulse signal 1305 in FIG. 13D, the controller 89 detects the rotation of the corresponding pulse signal 1305 as a trigger for detecting the rotation angle detection value. By acquiring 1207, it is possible to acquire a rotation angle detection signal holding signal 1307 when the signal light 306 is positioned on the basis of the rotation angle. As described above, by using the reference rotation angle detection unit 98 of this embodiment, it is possible to obtain the effect that the rotation angle detection signal holding signal 1307 that becomes the reference rotation angle information 97 can be obtained.

According to the optical information recording / reproducing apparatus 10 and the optical information recording medium 1 of the fifth embodiment described above, positioning at the rotation angle at which the signal light 306 is irradiated on the position reference pattern 105 and the rotation angle at that time It is possible to obtain a rotation angle detected from the detection pattern 102 (hereinafter referred to as a rotation angle offset). When recording in the recording radius area 104, the difference between the rotation angle detected from the rotation angle detection pattern 102 and the rotation angle offset can be obtained. As a result, the rotational angle position to which the signal light 306 is irradiated based on the position reference pattern 105 is determined, so that the same rotational angle can be used regardless of the apparatus that performs recording or reproduction even on a medium in which page data is not recorded. The effect of enabling the signal light 306 to be positioned at the position is obtained.

An example of the reference rotation angle detection unit 98 in the optical information recording and reproducing apparatus 10 will be described with reference to FIG. In the present embodiment, the optical information recording medium 1 described in the third embodiment or the optical information recording medium 1 described in the fourth embodiment is targeted for recording and reproduction, and the position reference pattern 105 using return light irradiated with the signal light 306. It is possible to obtain the radial position information 702 included in the above to obtain the radial position of the point on the medium where the signal light 306 is irradiated.

In the configuration of FIG. 14, in addition to the configuration shown in FIG. 12, the controller 89 is configured to be able to acquire a binarized reference pattern detection signal 1304. The address bus of the controller 89 may be connected via a register connected to the data bus, or may be connected directly to the input port of the controller 89. Further, a radial position information storage area 1401 is provided in the data memory 96.

In the case of the optical information recording medium 1 described in the third embodiment, as shown in FIG. 7, the radial position information 702 is formed by the 1 bit recording area 703 arranged in the circumferential direction in the position reference pattern 105. With respect to the position reference pattern 105 of this type, the controller 89 positions both the radial position and the rotational angle position of the signal light 306 at a position where either of the markers 701 at both ends of the radial position information 702 can be detected. The movement in units of rotation angles corresponding to the interval between the recording areas 703 and acquisition of the binarized reference pattern detection signal 1304 at that time is performed for the number of bits of the radial position information 702, and the acquired value is It is stored in the radial position information storage area 1401 provided in the memory 96. The controller 89 reads the value stored in the radial position information storage area 1401 in this way and refers to a table indicating the relationship between the radial position information 702 and the optical information recording medium 1 prepared in advance, and the controller 89 generates the signal light 306 It is possible to know the position of the radial position. The table representing the relationship with the optical information recording medium 1 may be provided in the program memory 95 as long as the controller 89 can refer to the table, or may be provided in another memory element.

In the case of the optical information recording medium 1 according to the fourth embodiment, as shown in FIG. 7, the radial position information 702 in the position reference pattern 105 is formed by 1 bit recording area 703 arranged in the radial direction. With respect to the position reference pattern 105 of this type, the controller 89 positions both the radial position and the rotational angle position of the signal light 306 at a position where either of the markers 701 at both ends of the radial position information 702 can be detected. The movement in units of the radial angle corresponding to the interval of the recording area 703 and acquisition of the binarized reference pattern detection signal 1304 at that time is performed for the number of bits of the radial position information 702, and the acquired value is data It is stored in the radial position information storage area 1401 provided in the memory 96. The controller 89 reads the value stored in the radial position information storage area 1401 in this way and refers to a table indicating the relationship between the radial position information 702 and the optical information recording medium 1 prepared in advance, and the controller 89 generates the signal light 306 It is possible to know the radial position where it is located. The table representing the relationship with the optical information recording medium 1 may be provided in the program memory 95 as long as the controller 89 can refer to the table, or may be provided in another memory element.

The process of positioning both the radial position and the rotational angle position of the signal light 306 at a position where either of the markers 701 at both ends of the radial position information 702 can be detected can be realized as follows.
First, with the signal light 306 positioned within the radius range of the buffer area 103, the disc is rotated to match the rotation angle at which the marker 701 is detected. Thereafter, the slider unit 92 is driven through the access control circuit 81 while monitoring the binarized reference pattern detection signal 1304. In this way, a radius area in which a level representing "0" equal to the distance X between markers defined in advance is detected is searched, and the signal light 306 is located at a position where a level of "1" adjacent thereto is detected. Move the radial position of.
As described above, the processing of positioning both the radial position and the rotational angle position of the signal light 306 at a position where either of the markers 701 at both ends of the radial position information 702 can be detected can be realized.

According to the reference rotation angle detection unit 98 in the optical information recording and reproducing apparatus 10 of the sixth embodiment described above, the radial position where the signal light 306 is located is detected by detecting the radial position information 702 in the position reference pattern 105. I will ask. If the radial position information 702 at a plurality of locations and the displacement amount of the slider moving part 92b corresponding to this are simultaneously obtained, then any rotational angle may be determined based on this relationship without detecting the radial position information 702 thereafter. The radial position of the signal light 306 can be obtained from the amount of displacement of the slider moving part 92b at the position.

As described above, according to the reference rotation angle detection unit 98 of the present embodiment, the signal light 306 can be guided to the same position with respect to the radial position in addition to any rotation angle regardless of the recording and reproducing device. can get.

In the present embodiment, an example of the configuration of the slider portion 92 and its periphery in the optical information recording and reproducing apparatus 10 will be described with reference to FIG.

In FIG. 15, the signal light 306 is irradiated from a straight line extending in the moving direction of the slider portion 92 from the rotation axis of the rotary motor 50 to a position having a deviation amount of ΔY (rotational axis deviation amount). As described above, when the rotational axis deviation amount exists, the difference θ between the rotational angle position irradiated with the signal light 306 and the rotational angle position detected by the optical system for detecting the rotation angle 14 is It changes with the radial position irradiated, and can not be ignored. In the slider portion 92 of this embodiment, the rotational axis shift amount ΔY is corrected, and the difference θ between the rotational angle position irradiated with the signal light 306 and the rotational angle position detected by the rotational angle detection optical system 14 is the radius It is possible to make it constant regardless of the position.

In FIG. 15, a rotational axis deviation adjustment unit 92c, a rotational axis deviation adjustment amount gauge 93c, and a rotational axis deviation adjustment amount detection optical system 93d are added to the configuration shown in FIG.
The rotation axis offset adjustment unit 92 c is a portion that is displaced in a direction orthogonal to the moving direction of the slider unit 92. The displacement amount is controlled from the controller 89 by an actuator (not shown) installed on the slider moving part 92b. Such a mechanism can be realized, for example, by using a stepping motor controlled in response to the pulse signal 1305 from the controller 89 as an actuator, and replacing the rotational movement of the stepping motor with linear movement via a ball screw mechanism.
The rotation axis offset adjustment optical system 93 d has a light source for emitting light and a light detector for detecting the return light intensity, and is mounted on the rotation axis offset adjustment unit 92 c.

The rotation axis offset adjustment amount gauge 93c is mounted on the slider moving unit 92b, and the light emitted from the rotation axis offset adjustment optical system 92c is irradiated over the entire movable range of the rotation axis offset adjustment unit 92c. Be placed. Further, the rotational axis offset adjustment amount gauge 93c is provided with a pattern in which the light returning to the rotational axis offset adjustment optical system 92c changes according to the displacement amount along the movable direction of the rotational axis offset adjustment unit 92c. By detecting a change in intensity, it is possible to determine the displacement amount of the rotation axis offset adjustment unit 92c.

In this embodiment, the rotation angle detection optical system 14 and the rotation motor 50 are mounted on the rotation axis offset adjustment unit 92c, and are orthogonal to the moving direction of the slider 92 in conjunction with the displacement of the rotation axis offset adjustment unit 92c. It is displaced in the direction of

According to the slider unit 92 of the seventh embodiment described above, the differences θ between the rotational angle positions at a plurality of different radial positions and the rotational angle positions detected by the optical system for detecting the rotational angle 14 are respectively determined and coincide with each other. Thus, the rotational axis shift amount ΔY can be corrected, and the difference θ with the rotational angle position detected by the rotational angle detection optical system 14 can be made constant regardless of the radial position.

In this embodiment, an optical information recording and reproducing method will be described with reference to FIG. 16 and FIG.
The present embodiment is a process of determining the rotation angle of the rotary motor 50 when the optical information recording and reproducing apparatus 10 described in the fifth embodiment records and reproduces the optical information recording medium 1 of the first embodiment.

FIG. 16 shows a flowchart of processing of the controller 89 until acquisition of the reference rotation angle information 97 after the start of activation.
SP 1601 is a step of positioning the slider portion 92 so that the signal light 306 is irradiated to the radius area of the buffer area 103 provided on the inner or outer circumference. In this process, the signal light 306 is not turned on so as not to expose the medium, and the radial position is determined based on the stopper 99 provided on the slider 92 or the slider movement amount detector 93.

SP 1602 is a step of lighting the signal light 306 after moving the position of the slider 92 so that the signal light 306 is irradiated to the buffer area 103 by SP 1601. As described above, the buffer area 103 is an area provided separately from the recording radius area 104 in order to prevent the exposure in this step from deteriorating the data recording quality. SP 1602 corresponds to the first step described in claim 11.

Steps SP1603 and SP1604 monitor the generation of the pulse signal 1305 from the edge detection circuit 1205 while changing the rotation angle of the rotary motor 50, and wait for the signal light 306 to be positioned in the position reference pattern 105. The loop formed by SP 1603 and SP 1604 corresponds to the second step described in claim 11.

SP1605 is a step of detecting the position reference pattern 105 and referring to the rotation angle detection value holding register 1207 to obtain the rotation angle detection signal holding signal 1307 and storing it as the reference rotation angle information 97 on the data memory 96. . SP 1605 corresponds to the third step described in claim 11.

As described above, reference rotation angle information 97 which is the difference between the rotation angle detected by the rotation angle detection optical system 14 and the rotation angle at which the signal light 306 is located is obtained.

Next, the processing of the controller 89 for positioning the rotational angle of the rotary motor 50 at the recording target position will be described using the flowchart of FIG. In this process, using the reference rotation angle information 97 obtained in the above process, a target amount of the rotation angle of the rotation motor 50 such that the signal light 306 is positioned at a desired rotation angle is determined. I am giving it to 88.

SP 1701 is a step of determining the rotational angle position and the radial position to be recorded in response to the recording processing request from the external control device 91.
SP 1702 is a step of obtaining a target amount of rotation angle of the rotary motor 50 according to the recording target position according to the rotation angle correction amount. Specifically, a value obtained by offsetting the rotational angle position of the recording target position by the angle of the reference rotational angle information 97 is set as the target amount of the rotational angle of the rotary motor 50.
SP1703 is a step for preventing the signal light 306 and the reference light 307 from being irradiated to the medium. For example, the shutter 303 blocks the light path from the light source 301. The SP 1703 may be performed before the SP 1704, and may be before the SP 1701 or the SP 1702.
SP 1704 is a step of moving to the target radial position. In this step, since the recording radius area 104 of the optical information recording medium 1 is exposed when the optical information recording medium 1 is irradiated with the signal light 306 and the reference light 307, the step of SP1703 of the former stage is provided. To avoid.
SP 1705 is a step of giving the disk rotation motor control circuit 88 a target amount of the rotation angle of the rotation motor 50. This corresponds to the fifth step of claim 11.
SP 1706 is a step of guiding the rotation angle of the rotary motor 50 to the target rotation amount.
After being positioned at a desired position, the SP 1707 starts irradiating the optical information recording medium 1 with the signal light 306 and the reference light 307 (only the reference light 307 at the time of reproduction), and performs recording on the medium or reproduction from the medium. It is a step.

According to the optical information recording and reproducing method of the present embodiment described above, it is possible to obtain the reference rotation angle information 97 which is the deviation between the rotation angle position irradiated with the signal light 306 and the rotation angle detection optical system. It is. By offsetting this value and giving a control target to the disk rotation motor control circuit 88, an effect of enabling positioning of the signal light 306 at the same desired rotation angle position regardless of the recording and reproducing device can be obtained.

An optical information recording and reproducing method different from that of the eighth embodiment will be described with reference to FIG. 18 and FIG.

FIG. 18 shows a flow chart of the processing of the controller 89.

The steps of SP1601, SP1602, SP1603, SP1604, and SP1605 are the same as those described with reference to FIG.
By executing the steps of SP1801 and SP1802 and SP1803 and SP1804, the signal light is detected by the signal light detection sensor while the rotation angle of the rotary motor is positioned in the vicinity of the rotation angle located in the loop formed by SP1603 and SP1604. It is led to the position where the radial position is detected, and the radial position information at that time and the slider movement amount detected by the slider movement amount detection unit are acquired at a plurality of radial positions. In this embodiment, slider position detection values and radial position information are acquired at two different radial positions. During this time, the signal light 306 moves in the radial direction along the position reference pattern 105 on the optical information recording medium 1, but a reference pattern peripheral buffer area 106 is provided around the position reference pattern 105. Exposure to the area is prevented. SP 1801 is a step of moving to the radial position where the first radial position information 702 is detected. First, move to the radial position to detect markers before and after the radial position information 702, detect the marker and shift to the discrimination processing of the radial position information 702, and the radius position information 702 is successfully acquired Complete. The detailed procedure of the series of processes is as described in the sixth embodiment for the position reference pattern 105 of the type shown in FIG. Similarly, an example of processing performed on the position reference pattern 105 of the type shown in FIG. 8 is as already described in the seventh embodiment.
SP1802 is a step of acquiring the slider position detection value from the slider movement amount detection unit 93 and the radius position information 702 based on the signal from the reference pattern detection optical system 94 at the radial position positioned at SP1801. .
SP 1803 is the step of moving to the radial position where the second radial position information is detected. The processing is the same as that of SP 1801 except that the radial position that is the movement target is different from SP 1803.
SP1804 is a step of acquiring the slider position detection value from the slider movement amount detection unit 93 and the radius position information 702 based on the signal from the reference pattern detection optical system 94 at the radial position located at SP1803.
SP1805 is a step of obtaining the relationship between the slider position detection value and the actual radial position based on the results of SP1802 and SP1804. For example, assuming that the radial position corresponding to the radial position information 702 in SP 1802 is r1, the slider position detection value is r1 ', the radial position corresponding to the radial position information 702 in SP 1804 is r2, and the slider position detection value is r2'. The relationship between the radial position (r) where the signal light 306 is located and the slider position detection value r 'is determined as in the following equation (1).

(1)
r = {(r1-r2) / (r1 '-r2')} (r '+ r2 r1'-r1 r2 ')
Next, the processing of the controller 89 for guiding the rotational angle of the rotary motor 50 and the radial position of the slider unit 92 to the recording target position will be described using the flowchart of FIG. In this process, using the reference rotation angle information 97 obtained in the above process, a target amount of the rotation angle of the rotation motor 50 such that the signal light 306 is positioned at a desired rotation angle is determined. In addition to 88, the target quantity of the position of the slider 92 is obtained using the relationship of Equation 1 and is given to the access control circuit 81.

In FIG. 19, since each step of SP1701, SP1702, SP1704, SP1705, and SP1706 is the same as the step described in the eighth embodiment, the description will be omitted.
SP 1702 corresponds to the sixth step described in claim 12.
SP 1901 is a step for obtaining a slider position corresponding to the target radial position. The target slider position can be determined by using the relationship of Equation 1 with respect to the radial position of the recording target position determined in SP1701.
SP1902 is a step of giving the target amount of the slider position obtained in SP1901 to the access control circuit.
SP1903 is a step of guiding the radial position of the slider portion to the target position.

According to the optical information recording and reproducing method of the ninth embodiment described above, there is obtained an effect that the signal light 306 can be positioned at the desired radial position / rotational angle position of the optical information recording medium 1 without using the device. Be

An optical information recording and reproducing method different from the eighth and ninth embodiments will be described with reference to FIGS.
In this embodiment, when performing recording and reproduction processing on the optical information recording medium 1 described in the third embodiment or the fourth embodiment using the optical information recording and reproducing apparatus 10 described in the sixth embodiment, the signal light 306 is used as an apparatus. This is an optical information recording and reproducing method which makes it possible to position the optical information recording medium 1 at a desired radial position and rotational angular position regardless of the above. A buffer area 103 is provided on both the outer peripheral side and the inner peripheral side of the optical information recording medium 1.

In this embodiment, the amount of change of the reference rotation angle information 97, which is the deviation between the rotation angle position irradiated with the signal light 306 depending on the radial position and the rotation angle detection optical system, is Applicable when it can not be ignored. That is, before positioning the signal light 306 at the recording position, recording is performed by obtaining the relationship between the slider position detection value, the actual radial position, and the reference rotational angle information 97 at a plurality of radial positions. When positioning the signal light 306 at the position, correction of the target amount of the rotation angle of the rotary motor 50 is performed according to the radial position to be positioned, so that the signal light 306 is not an optical information device The effect of enabling positioning at the desired radial position / rotational angle position of the recording medium 1 is obtained.
FIG. 20 shows a flow chart of the processing of the controller 89.

Since SP1602, SP1603, SP1604, SP1801, SP1802, SP1803, SP1804 and SP1805 are the same as in FIG. 16 and FIG. 18 and are as described in the eighth and ninth embodiments, the description will be omitted.
SP 2001 is processing for determining the position in the radial direction so that the signal light 306 is located in the buffer area 103 provided on the inner peripheral side. In this process, the signal light 306 is not turned on so as not to expose the medium, and the radial position is determined based on the stopper 99 provided on the slider 92 or the slider movement amount detector 93. SP 2001 corresponds to the first step of claim 13.
The loop formed by SP 1603 and SP 1604 irradiates the signal light to the optical information recording medium and changes the rotation angle of the rotation motor so that the position reference pattern is detected by the signal light detection sensor. Position the
SP 2002 is a step of acquiring and holding the slider position and the rotation angle detection value (reference rotation angle information 97) detected by the slider movement amount detection unit 93.
SP 2003 is a step of turning off the signal light 306 so as not to expose the medium when the irradiation position of the signal light 306 moves between the buffer regions 103 provided on the inner circumferential side and the outer circumferential side. If the radial position can be changed while the signal light 306 is accurately positioned on the position reference pattern 105, SP 2003 may not be performed.
SP 2004 is processing for determining the position in the radial direction so that the signal light 306 is located in the buffer area 103 provided on the inner circumferential side. The radial position is determined based on the stopper 99 provided on the slider portion 92 or the slider movement amount detection portion 93. SP 2005 is a step of acquiring and holding the slider position and the rotation angle detection value (reference rotation angle information 97) detected by the slider movement amount detection unit 93 as in SP 2002.
The processing between SP2004 and SP2005 is similar to the processing from SP2001 to SP2003 except where the slider is positioned.
In SP2006, the relationship between the slider radial position and the rotation angle correction amount detected by the slider movement amount detection unit 93 based on the slider radial position and the rotation angle detection value in the inner and outer buffer regions 103 acquired and held in SP2003 and SP2005. Is a processing step for determining For example, the relationship between the rotation angle correction amount (reference rotation angle information 97) at the radial position between the inner and outer buffer regions 103 is determined by linear interpolation. The processing up to SP 2006 enables the signal light 306 to be positioned on the position reference pattern 105 regardless of the radial position of the slider. However, since the relationship between the radial position of the slider and the radial position of the signal light 306 is unknown, this relationship is determined in the subsequent processing up to SP1805.

The steps of SP1801, SP1802, SP1803, and SP1804 are the same as in the ninth embodiment, and thus the description thereof is omitted.
SP1805 is a step of obtaining the relationship between the slider position detection value and the positioned radial position of the signal light 306 based on the results of SP1802 and SP1804. The step is similar to that of the ninth embodiment, so detailed description will be omitted.

According to the above processing, when the relationship between the slider radial position and the rotation angle correction amount obtained in SP2006 and the relationship between the slider position detection value obtained in SP1805 and the radial position of the signal light 306 are matched, the signal light 306 is positioned. It is possible to obtain the movement target position of the slider portion 92 and the rotation angle target amount of the rotary motor 50 corresponding to the desired radial direction and the position of the rotation angle.

Next, the processing of the controller 89 for guiding the rotational angle of the rotary motor 50 and the radial position of the slider portion 92 to the recording target position will be described using the flowchart of FIG.

In FIG. 21, the processing steps of SP1704, SP1705, SP1902, SP1903, and SP1706 are the same as in the eighth and ninth embodiments, and thus the description thereof is omitted.

In FIG. 21, SP 2101 determines the target position of the slider given to the access control circuit 81 from the target radial position of the signal light 306 based on the relationship between the slider position detection value obtained in SP 1805 of FIG. It is a step to be sought.
SP2102 is a step of obtaining a rotation angle correction amount (reference rotation angle information 97) based on the relationship between the slider target position obtained in SP2101 and the slider radial position obtained in SP2006 and the rotation angle correction amount.
The SP 2103 is a target amount of rotation angle of the rotation motor 50 given to the disk rotation motor control circuit 88 based on the rotation angle correction amount (reference rotation angle information 97) obtained in SP 2102 and the rotation angle position for performing recording determined in SP 1701. Is a step of determining
By applying the target position of the slider determined in SP 2101 and the target amount of rotation angle of the rotary motor 50 determined in SP 2103 to the apparatus in SP 1902 and SP 1704, the signal light 306 is desired in both radial direction and rotational angle direction in SP 1903 It is located in the place of

According to the optical information recording and reproducing method described in the tenth embodiment described above, even when the position of the rotation shaft of the rotary motor 50 is shifted, the signal light 306 is not used by the device but the desired of the optical information recording medium 1 The effect of being able to position at the radial position / rotational angle position is obtained.

An optical information recording and reproducing method different from the eighth to tenth embodiments will be described with reference to FIG.

In the present embodiment, when the recording and reproducing process is performed on the optical information recording medium 1 described in the third embodiment or the fourth embodiment using the optical information recording and reproducing apparatus 10 described in the seventh embodiment, the signal light 306 is processed. This is an optical information recording and reproducing method which makes it possible to position the optical information recording medium 1 at a desired radial position and rotational angular position regardless of the above. A buffer area 103 is provided on both the outer peripheral side and the inner peripheral side of the optical information recording medium 1.

In the present embodiment, the amount of change in the reference rotation angle information 97, which is the deviation between the rotation angle position irradiated with the signal light 306 depending on the radial position and the rotation angle detection optical system, is neglected particularly due to the rotation axis offset of the rotation motor 50. Applicable when not possible. That is, prior to positioning the signal light 306 at the recording position, the slider position detection values and the actual radial position corresponding to the radial position information 702 are obtained at a plurality of radial positions, Correct the deviation of As a result, even in the above case, the signal light 306 can be positioned at the desired radial position / rotational angle position of the optical information recording medium 1 without using the device.

FIG. 22 shows a flow chart of the processing of the controller 89.

In FIG. 22, the processing from SP 2001 to SP 1804 is the same as that of the tenth embodiment, except that SP 2201 and SP 2202 are added.
The processing from SP 2001 to SP 1804 is as described above, so the description is omitted.

In SP 2201, the radial position information (set as r 1) obtained in SP 180 2, the rotation angle detection amount (set as θ 1) at this time and the radius position information (set as r 2) obtained in SP 180 4, and the rotation angle detected at this time In this step, the adjustment amount ΔY of the axis deviation adjustment unit 92c of the slider rotation is obtained based on the amount (set as θ2). This can be determined, for example, as Equation 2.

SP2202 is a step of adjusting the axis offset adjustment unit 92c so as to correct only the adjustment amount ΔY which is also stopped in SP2201.

When the processing described above is performed, the position of the rotation axis of the rotation motor 50 is corrected, and the reference rotation which is the deviation between the rotation angle position to which the signal light 306 is irradiated and the rotation angle detection optical system regardless of the radial position. The angle information 97 is constant.
Therefore, the signal light 306 can be positioned at the desired radial position / rotational angle position of the optical information recording medium 1 regardless of the device by performing the same processing as in the ninth embodiment after such processing. It becomes.

According to the optical information recording and reproducing method described in the tenth embodiment described above, even when the position of the rotation shaft of the rotary motor 50 is shifted, the signal light 306 is not used by the device but the desired of the optical information recording medium 1 The effect of being able to position at the radial position / rotational angle position is obtained.

The present invention is not limited to the embodiments described above, but includes various modifications. For example, the embodiments described above are described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. Also, part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. In addition, with respect to a part of the configuration of each embodiment, it is possible to add, delete, and replace other configurations. In the present embodiment, the optical information recording and reproducing apparatus and the optical information recording and reproducing method are described. However, the apparatus and method for performing both recording and reproduction are not necessary, and an optical information recording apparatus, an optical information reproducing apparatus, and optical information It may be a recording method or an optical information reproducing method.

Further, each of the configurations, functions, processing units, processing means, etc. described above may be realized by hardware, for example, by designing part or all of them with an integrated circuit. Further, each configuration, function, etc. described above may be realized by software by the processor interpreting and executing a program that realizes each function. Information such as programs, tables, and files for realizing each function can be placed in a memory, a hard disk, a recording / reproducing apparatus such as a solid state drive (SSD), or a recording medium such as an IC card, an SD card, or a DVD. .

Further, control lines and information lines indicate what is considered to be necessary for the description, and not all control lines and information lines in the product are necessarily shown. In practice, almost all configurations may be considered to be mutually connected.

1 ... optical information recording medium, 10 ... optical information recording and reproducing device, 11 ... pickup
12: Reference light optical system for reproduction, 13: Cure optical system,
14: Optical system for detecting the rotation angle 81: Access control circuit
82: Light source drive circuit 83: Servo signal generation circuit
84: Servo control circuit 85: Signal processing circuit 86: Signal generation circuit
87: Shutter control circuit 88: Disc rotation motor control circuit
89: controller, 90: input / output control circuit, 91: external control device
93: Slider movement amount detection unit 94: Reference pattern detection optical system 98: Reference rotation angle detection unit
103 ・ ・ ・ Buffering area
105: Position reference pattern,
106: Reference pattern peripheral buffer area 301: Light source 303: Shutter 306: Signal light 307: Reference light
308: Beam expander, 309: phase mask,
310 ... relay lens, 311 ... PBS prism,
312 ... spatial light modulator, 313 ... relay lens, 314 ... spatial filter,
315: Objective lens 316: Polarization direction conversion element 320: Actuator
321: lens, 322: lens, 323: actuator,
324 ... mirror, 325 ... light detector 702 ... radius position information

Claims (14)

An optical information recording medium having a disk-like shape and having a recording radius area for recording data as a hologram,
A buffer area not used for recording data is provided over the entire rotation angle on at least one of the outer circumference side of the recording radius area and the inner circumference side of the recording radius area,
A rotational angle detection pattern is extended over the entire circumference of at least one of the recording radius area and the buffer area on the outer circumferential side, and at least the recording radius area and the buffer area on the inner circumferential side. Have
A position reference pattern is provided in the radial direction at a specific rotation angle of the rotation angle detection pattern,
The position reference pattern is provided so as to be continuous over the entire radius range as the buffer area;
The position reference pattern is formed to have a reflected light intensity or a transmittance light intensity different from other areas in the recording radius area.
Optical information storage medium. In the recording radius area,
The position reference pattern exists over the recording radius area,
A reference pattern peripheral buffer area not used for recording data is provided in a rotation angle area adjacent to the position reference pattern.
An optical information recording medium according to claim 1. In the position reference pattern, radial position information representing a radial position is recorded at constant intervals in the radial direction,
The recording area of the 1-bit data indicating the radial position information is such that at least one of the reflectance and the transmittance in any one of the data indicating 1 and the data indicating 0 is different from that in the position reference pattern. Characterized in that
An optical information recording medium according to claim 1 or 2. The optical information recording medium according to claim 3, wherein an interval at which the radial position information is recorded is the same as a radial interval at which data is recorded. The radial position information is recorded by allocating a recording area of the 1-bit data in units of areas divided by rotation angles at equal intervals in the circumferential direction, and arranging a certain number in the circumferential direction,
The radial position information may be a pattern different depending on the arranged radial position,
An optical information recording medium according to claim 3 or 4. The radial position information is recorded by allocating a recording area of the 1-bit data in units of areas divided by rotation angles equally spaced in the radial direction, and arranging a certain number in the radial direction,
The radial position information may be a pattern different depending on the arranged radial position,
An optical information recording medium according to claim 3 or 4. While providing at least one of the beginning and the end of the radial position information with a marker having a reflectance or transmittance different from the surrounding in the position reference pattern,
Of the position reference pattern, in the radius range in which the radial position falls on the buffer area,
Provide a second marker at the same rotational angle position as the marker,
A second marker is provided so as to be continuous in the radial range over the buffer area,
The optical information recording medium according to any one of claims 4 to 6. An optical information recording and reproducing apparatus for recording data on an optical information recording medium having a disk-like shape and having a recording radius area for recording data as a hologram,
A rotary motor for rotating the optical information recording medium;
A laser for emitting light for performing data recording processing or reproduction processing on the optical information recording medium;
A rotary motor control unit that controls a rotation angle of the rotary motor;
A rotation angle detection optical system for detecting a rotation angle from a rotation angle detection pattern provided on the entire circumference of the optical information recording medium;
A spatial light modulator that spatially modulates light according to data to be recorded on the optical information recording medium;
A position reference pattern provided at a specific angle of the rotation angle detection pattern by detecting light transmitted through or reflected from the optical information recording medium through the spatial light modulator and obtained through the spatial light modulator Based on the output of the reference pattern detection optical system for detecting the reference pattern detection optical system and the reference pattern detection optical system, a reference for acquiring reference rotation angle information which is a detected value of the rotation angle detection optical system in the state where the position reference pattern is detected. A rotation angle detection unit,
A slider unit that changes a relative position between the optical information recording medium and the signal light so as to move to a radial position on the optical information recording medium that emits the signal light;
An access control circuit that controls the slider unit to guide the signal light to a target radial position;
A controller having a function of acquiring and holding the reference rotation angle information, a function of giving a target rotation angle to the rotary motor control unit, and a function of giving a target radial position to the slider control unit;
An optical information recording and reproducing apparatus comprising: And a slider movement amount detection unit that detects the displacement amount of the slider and notifies the controller of the displacement amount.
The controller
A function of acquiring a value of a binarized reference pattern detection signal based on the output of the signal light detection sensor and storing the value in a data memory;
A function of reading the value stored in the data memory;
And a function of obtaining a radial position from the value read from the data memory.
The optical information recording and reproducing apparatus according to claim 8. The slider unit
By adjusting the position of the slider portion in the direction orthogonal to the displacement direction, the direction of the straight line connecting the rotation axis of the rotary motor and the irradiation position of the signal light is the same as the displacement direction of the slider portion. Equipped with a rotational axis offset adjustment unit to adjust
An optical information recording and reproducing apparatus according to claim 8 or 9. An optical information recording and reproducing method for recording or reproducing data using an optical information recording and reproducing apparatus with respect to an optical information recording medium having a disk shape and having a recording radius area for recording data as a hologram There,
The optical information recording medium has a buffer area which is not used for recording data over at least one of the outer rotation side and the inner circumference side of the recording radius area over the entire rotation angle, The rotational angle detection pattern is extended over the entire circumference on at least one of the recording radius area and the buffer area on the outer circumferential side, and on the recording radius area and the buffer area on the inner circumferential side. And a position reference pattern is provided in the radial direction at a specific rotation angle of the rotation angle detection pattern, and the position reference pattern is provided continuously over the entire radius range as the buffer area; The position reference pattern is formed in a structure having a reflected light intensity or a transmittance light intensity different from other areas in the recording radius area, Before processing position the signal light position for playback,
Positioning a radial position so as to irradiate the signal light to the buffer area;
The position reference pattern is detected by a reference pattern detection optical system that detects the position reference pattern by changing the rotation angle of a rotary motor that rotates the optical information recording medium while irradiating the optical information recording medium with the signal light. Positioning the rotational angle of the rotary motor so that is detected,
Based on the rotation angle combined in the second step, the rotation angle detection value indicated by the rotation angle sensor for detecting the rotation angle is obtained from the rotation angle detection pattern provided on the optical information recording medium, and the reference rotation angle is calculated. The third step to obtain
Do,
When positioning the signal light at a position where recording or reproduction is to be performed,
A fourth step of determining a target value of a rotational angle to be recorded or reproduced based on the detected value of the rotational angle sensor and the reference rotational angle determined in the third step, and determined in the fourth step Performing a fifth step of giving a target value of a rotational angle to a rotary motor control circuit that controls the rotary motor;
Optical information recording and reproducing method. An optical information recording and reproducing method for recording or reproducing data using an optical information recording and reproducing apparatus with respect to an optical information recording medium having a disk shape and having a recording radius area for recording data as a hologram There,
The optical information recording medium has a buffer area which is not used for recording data over at least one of the outer rotation side and the inner circumference side of the recording radius area over the entire rotation angle, The rotational angle detection pattern is extended over the entire circumference on at least one of the recording radius area and the buffer area on the outer circumferential side, and on the recording radius area and the buffer area on the inner circumferential side. And a position reference pattern is provided in the radial direction at a specific rotation angle of the rotation angle detection pattern, and the position reference pattern is provided continuously over the entire radius range as the buffer area; The position reference pattern is formed in a structure having a reflected light intensity or a transmittance light intensity different from other areas in the recording radius area,
Prior to the process of positioning the signal light at the recording or reproducing position,
Positioning the signal light in the buffer area;
The position reference pattern is detected by a reference pattern detection optical system that detects a position reference pattern by changing the rotation angle of a rotary motor that rotates the optical information recording medium while irradiating the optical information recording medium with the signal light. Positioning the rotational angle of the rotary motor so as to be detected;
Based on the rotation angle positioned in the second step, the rotation angle detection value indicated by the rotation angle sensor for detecting the rotation angle from the rotation angle detection pattern provided on the recording information recording medium is determined, and the reference rotation angle The third step of obtaining
In the state where the rotation angle of the rotary motor is positioned near the rotation angle positioned in the second step, the signal light is guided to the radial position where the radial position information is detected by the signal light detection sensor, Of the radial position information and the slider movement amounts detected by the slider movement amount detection unit that detects the displacement amount of the slider unit that changes the relative position between the optical information recording medium and the signal light at a plurality of radial positions Do the fourth step to acquire,
Furthermore, a fifth step is performed to obtain the relationship between the slider movement amount detected by the slider movement amount detection unit and the radial position at which the signal light is positioned based on the result of the fourth step,
When positioning the signal light at a position where recording or reproduction is to be performed,
A sixth step of determining a target value of the rotational angle of the rotary motor based on the detected value of the rotational angle sensor and the reference rotational angle determined in the fourth step;
Seventh step of determining a movement target position of the slider corresponding to the movement target radial position based on the relationship between the slider movement amount detected by the slider movement amount detection unit and the radial position at which the signal light is positioned When,
Based on the results of the sixth step and the seventh step
An optical information recording and reproducing method comprising: an eighth step of giving a control target amount to a rotary motor control circuit for controlling the rotary motor and the access control circuit for controlling the slider unit. An optical information recording and reproducing method for recording or reproducing data using an optical information recording and reproducing apparatus with respect to an optical information recording medium having a disk shape and having a recording radius area for recording data as a hologram There,
The optical information recording medium has buffer areas which are not used for recording data both on the outer peripheral side of the recording radius area and on the inner peripheral side of the recording radius area over the entire rotation angle, and the recording is performed. A rotational angle detection pattern is provided over the entire circumference on at least one of the outer radius side of both the radius area and the buffer area and the inner radius side of both the recording radius area and the buffer area. A position reference pattern is provided in the radial direction at a specific rotation angle of the rotation angle detection pattern, and the position reference pattern is provided continuously over the entire radius range as the buffer area, The position reference pattern is formed in a structure having a reflected light intensity or a transmittance light intensity different from other areas in the recording radius area,
Before processing for positioning the signal light at a position where recording or reproduction is to be performed,
A first step of positioning the signal light in one of the buffer regions;
The position reference pattern is detected by a reference pattern detection optical system that detects the position reference pattern by changing the rotation angle of a rotary motor that rotates the optical information recording medium while irradiating the optical information recording medium with the signal light. Positioning the rotational angle of the rotary motor so that is detected,
A first rotation angle detection value indicated by a rotation angle sensor for detecting a rotation angle is obtained from a rotation angle detection pattern provided on the optical information recording medium based on the rotation angle positioned in the second step. A third step of obtaining a reference rotation angle;
A fourth step of performing the first step, the second step and the third step with respect to the other buffer area;
It is detected by a slider movement amount detection unit that detects a displacement amount of a slider unit that changes the relative position between the optical information recording medium and the signal light based on the results of the third step and the fourth step. A fifth step of determining the relationship between the slider movement amount and the reference rotation angle;
Based on the relationship determined in the fifth step, the signal light is moved along the position reference pattern and guided to the radial position at which the radial position information is detected by the signal light detection sensor, and at that time A sixth step of acquiring the radial position information and the slider movement amount detected by the slider movement amount detection unit at a plurality of radial positions;
A seventh step of determining a relationship between a slider movement amount detected by the slider movement amount detection unit and a radial position at which the signal light is positioned based on a result of the sixth step;
When positioning the signal light at a position where recording or reproduction is to be performed,
An eighth step of determining a movement target position of the slider corresponding to the movement radial position from the target radial position based on the relation determined in the seventh step;
Based on the detection value of the rotation angle sensor, the reference rotation angle determined in the fourth step, and the movement target value of the slider determined in the eighth step, a target value of the rotation angle of the rotary motor is determined The ninth step,
Based on the results of the eighth step and the ninth step, a control target amount is given to a rotary motor control circuit that controls the rotary motor and an access control circuit that controls the slider unit, and a signal is sent to the target position. And a tenth step of guiding light. An optical information recording and reproducing method for recording or reproducing data using an optical information recording and reproducing apparatus with respect to an optical information recording medium having a disk shape and having a recording radius area for recording data as a hologram There,
The optical information recording medium has buffer areas which are not used for recording data both on the outer peripheral side of the recording radius area and on the inner peripheral side of the recording radius area over the entire rotation angle, and the recording is performed. A rotational angle detection pattern is provided over the entire circumference on at least one of the outer radius side of both the radius area and the buffer area and the inner radius side of both the recording radius area and the buffer area. A position reference pattern is provided in the radial direction at a specific rotation angle of the rotation angle detection pattern, and the position reference pattern is provided continuously over the entire radius range as the buffer area, The position reference pattern is formed in a structure having a reflected light intensity or a transmittance light intensity different from other areas in the recording radius area,
Before processing for positioning the signal light at a position where recording or reproduction is to be performed,
A first step of positioning the signal light in one of the buffer regions;
The position reference pattern is detected by a reference pattern detection optical system that detects the position reference pattern by changing the rotation angle of a rotary motor that rotates the optical information recording medium while irradiating the optical information recording medium with the signal light. Positioning the rotational angle of the rotary motor so that is detected,
A first rotation angle detection value indicated by a rotation angle sensor for detecting a rotation angle is obtained from a rotation angle detection pattern provided on the optical information recording medium based on the rotation angle positioned in the second step. A third step of obtaining a reference rotation angle;
A fourth step of performing the first step, the second step and the third step with respect to the other buffer area;
It is detected by a slider movement amount detection unit that detects a displacement amount of a slider unit that changes the relative position between the optical information recording medium and the signal light based on the results of the third step and the fourth step. A fifth step of determining the relationship between the slider movement amount and the reference rotation angle;
Based on the relationship determined in the fifth step, the signal light is moved along the position reference pattern and guided to the radial position at which the radial position information is detected by the signal light detection sensor, and at that time A sixth step of acquiring the radial position information and the slider movement amount detected by the slider movement amount detection unit at a plurality of radial positions;
Based on the result of the sixth step, by adjusting the position in the direction orthogonal to the displacement direction of the slider unit, the direction of the straight line connecting the rotation axis of the rotary motor and the irradiation position of the signal light is the slider An optical information recording and reproducing method comprising: performing a seventh step of obtaining an adjustment amount to be applied to a rotation axis offset adjustment unit which adjusts in the same direction as a section displacement direction, and correcting the axis offset.

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