WO2015083247A1 - Optical information recording device and optical information recording method - Google Patents

Abstract

The present invention addresses the problem of providing an interleaving method suitable for a recording format that includes sub-pages for which the portion that is effective data (which includes user data and the like) is smaller than that of other sub-page regions. One example of a means for solving this problem is an optical information recording device that uses holography to record information on an information recording medium, said information recording device being equipped with a signal generation unit that generates two-dimensional data, and a two-dimensional optical modulation unit that displays the two-dimensional data and spatially modulates transmitted or reflected light. The signal generation unit appends an error correction code to data to form p bits of sector data (where p is a natural number), and forms page data by means of q sectors (where q is a natural number). The signal generation unit divides the region to be displayed by the two-dimensional optical modulation unit into r sub-pages (where r is a natural number) so as to include sub-pages for which the portion that is effective data is smaller than that of other sub-page regions, and generates two-dimensional data such that the effective data allocated to each sub-page is an integer multiple of the number of sectors.

Description

Optical information recording apparatus and optical information recording method

The present invention relates to an apparatus and method for recording information on a recording medium using holography.

As a conventional technique, for example, there is JP-A-2008-140485 (Patent Document 1). This publication describes that “recording data within one page is arranged (interleaved) in accordance with a predetermined agreement and the interleaved page data is recorded on a recording medium”.

JP 2008-140485 A

The interleaving described in Patent Document 1 is a method of generating rectangular page data by arranging data in a data sequence arranged in time series in a two-dimensional and discrete manner.

Data recording in the hologram recording apparatus is performed by irradiating the optical information recording medium with signal light and reference light spatially modulated by a spatial light modulator. At the time of recording, the modulated signal light is irradiated onto the optical information recording medium through the objective lens. In general, since an objective lens is substantially circular, when information is recorded using the objective lens, a light spot formed on the optical information recording medium becomes substantially circular according to the shape of the objective lens. In this case, when the page data to be recorded is divided into sub-pages of a predetermined size (for example, a square shape), if an attempt is made to secure as much storage capacity as possible, some sub-pages such as an effective data area (effective objective lens) In the subpage near the circumference of the data area of the page data corresponding to the inner diameter), the effective data portion including the user data is smaller than the subpage area in the circle. However, Patent Document 1 does not describe an interleaving method considering the above-described circumstances.

Therefore, an object of the present invention is to provide an interleaving method adapted to a recording data format including a subpage in which a portion of valid data including user data or the like is smaller than an area of another subpage.

As an example, the above problem can be solved by generating two-dimensional data so that valid data distributed to each subpage is an integral multiple of the number of sectors.

According to the present invention, it is possible to provide an interleaving method suitable for a recording format including a subpage in which a portion of valid data including user data or the like is smaller than an area of another subpage, and to improve error correction capability. it can.

Schematic diagram showing the outline of 1-page recording data Schematic diagram showing an embodiment of an optical information recording / reproducing apparatus Schematic showing an embodiment of a pickup in an optical information recording / reproducing apparatus Schematic showing an embodiment of a pickup in an optical information recording / reproducing apparatus Schematic showing an embodiment of a pickup in an optical information recording / reproducing apparatus Schematic showing an embodiment of the operation flow of the optical information recording / reproducing apparatus Schematic showing an embodiment of the operation flow of the optical information recording / reproducing apparatus Schematic showing an embodiment of the operation flow of the optical information recording / reproducing apparatus Schematic showing the Example of the signal generation circuit in an optical information recording / reproducing apparatus Schematic showing the Example of the signal processing circuit in an optical information recording / reproducing apparatus Schematic showing the Example of the operation | movement flow of a signal generation circuit and a signal processing circuit Schematic showing the Example of the operation | movement flow of a signal generation circuit and a signal processing circuit Schematic diagram showing the outline of 1-page recording data Schematic diagram showing the outline of 1-page recording data Schematic diagram showing the outline of 1-page recording data Schematic diagram showing the outline of 1-page recording data Schematic representing an example of the operation flow of the interleave circuit Schematic diagram showing the outline of 1-page recording data Schematic diagram showing the outline of 1-page recording data

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

Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 2 is a block diagram showing a recording / reproducing apparatus of an optical information recording medium for recording and / or reproducing 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 the information signal to be recorded from the external control device 91 by the input / output control circuit 90. When reproducing, the optical information recording / 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 reproduction reference light optical system 12, a cure optical system 13, a disk rotation angle detection optical system 14, and a rotation motor 50. The optical information recording medium 1 is a rotation motor. 50 can be rotated.

The pickup 11 plays a role of irradiating the optical information recording medium 1 with reference light and signal light and recording digital information on the recording medium using holography. At this time, the 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 the information recorded on the optical information recording medium 1, the reproduction reference light optical system 12 generates a light wave that causes the reference light emitted from the pickup 11 to enter the optical information recording medium in a direction opposite to that during recording. Generate. Reproduction light reproduced by the reproduction reference light is detected by a photodetector (to be described later) in the pickup 11, and a signal is reproduced by the signal processing circuit 85.

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

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. Precure is a pre-process for irradiating a predetermined light beam in advance before irradiating the desired position with reference light and signal light when recording information at a desired position in the optical information recording medium 1. Post-cure is a post-process for irradiating a predetermined light beam after recording information at a desired position in the optical information recording medium 1 so that additional recording cannot be performed at the desired position.

The disk 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, a signal corresponding to the rotation angle is detected by the disk rotation angle detection optical system 14, and a disk rotation motor control circuit is detected by the controller 89 using the detected signal. The rotation angle of the optical information recording medium 1 can be controlled via 88.

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

Further, the pickup 11 and the disc cure optical system 13 are provided with a mechanism capable of sliding the position in the radial direction of the optical information recording medium 1, and the position is controlled via the access control circuit 81.

By the way, the recording technology using the principle of angle multiplexing of holography tends to have a very small tolerance for the deviation of the reference beam angle.

Therefore, a mechanism for detecting the deviation amount of the reference beam angle is provided in the pickup 11, a servo control signal is generated by the servo signal generation circuit 83, and the deviation amount is corrected via the servo control circuit 84. It is necessary to provide a servo mechanism for this purpose in the optical information recording / reproducing apparatus 10.

Further, the pickup 11, the cure optical system 13, and the disk rotation angle detection optical system 14 may be simplified by combining several optical system configurations or all optical system configurations into one.

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

The light beam that has passed through the PBS prism 305 functions as signal light 306, and after the light beam diameter is expanded by the beam expander 308, the light beam passes through the phase mask 309, the relay lens 310, and the PBS prism 311 and passes through the spatial light modulator 312. Is incident on.

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

On the other hand, the light beam reflected from the PBS prism 305 functions as reference light 307 and is set to a predetermined polarization direction according to recording or reproduction by the polarization direction conversion element 316 and then galvano- lated via the mirror 317 and the mirror 318. Incident on the mirror 319. Since the angle of the galvanometer mirror 319 can be adjusted by the actuator 320, the incident angle of the reference light 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 light, an element that converts the wavefront of the reference light may be used instead of the galvanometer mirror.

In this way, the signal light and the reference light are incident on the optical information recording medium 1 so as to overlap each other, whereby an interference fringe pattern is formed in the recording medium, and information is recorded by writing this pattern on the recording medium. To do. In addition, since the incident angle of the reference light incident on the optical information recording medium 1 can be changed by the galvanometer mirror 319, recording by angle multiplexing is possible.

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

FIG. 4 shows a reproduction principle in an example of a basic optical system configuration of the pickup 11 in the optical information recording / reproducing apparatus 10. When reproducing the recorded information, the reference light is incident on the optical information recording medium 1 as described above, and the light beam transmitted through the optical information recording medium 1 is reflected by the galvanometer mirror 324 whose angle can be adjusted by the actuator 323. By doing so, the reproduction reference light is generated.

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 enters the photodetector 325, and the recorded signal can be reproduced. As the photodetector 325, for example, an image sensor such as a CMOS image sensor or a CCD image sensor can be used. However, any element may be used as long as page data can be reproduced.

FIG. 5 is a diagram showing another configuration of the pickup 11. In FIG. 5, the light beam emitted from the light source 501 passes through the collimator lens 502 and enters the shutter 503. When the shutter 503 is open, after the light beam passes through the shutter 503, the optical element 504 configured by, for example, a half-wave plate or the like adjusts the light quantity ratio of p-polarized light and s-polarized light to a desired ratio. After the polarization direction is controlled, the light enters the PBS prism 505.

The light beam transmitted through the PBS prism 505 is incident on the spatial light modulator 508 via the PBS prism 507. The signal light 506 to which information is added by the spatial light modulator 508 is reflected by the PBS prism 507 and propagates through an angle filter 509 that passes only a light beam having a predetermined incident angle. Thereafter, the signal light beam is focused on the hologram recording medium 1 by the objective lens 510.

On the other hand, the light beam reflected from the PBS prism 505 functions as reference light 512, and is set to a predetermined polarization direction according to recording or reproduction by the polarization direction conversion element 519, and then passes through the mirror 513 and the mirror 514 to be a lens. 515 is incident. The lens 515 plays a role of condensing the reference light 512 on the back focus surface of the objective lens 510, and the reference light once condensed on the back focus surface of the objective lens 510 becomes parallel light again by the objective lens 510. Is incident on the hologram recording medium 1.

Here, the objective lens 510 or the optical block 521 can be driven, for example, in the direction indicated by reference numeral 520. By shifting the position of the objective lens 510 or the optical block 521 along the driving direction 520, the objective lens 510 and the objective lens can be driven. Since the relative positional relationship of the condensing points on the back focus surface 510 changes, the incident angle of the reference light incident on the hologram recording medium 1 can be set to a desired angle. Instead of driving the objective lens 510 or the optical block 521, the incident angle of the reference light may be set to a desired angle by driving the mirror 514 with an actuator.

In this way, by causing the signal light and the reference light to enter the hologram recording medium 1 so as to overlap each other, an interference fringe pattern is formed in the recording medium, and information is recorded by writing this pattern on the recording medium. . Further, by shifting the position of the objective lens 510 or the optical block 521 along the driving direction 520, the incident angle of the reference light incident on the hologram recording medium 1 can be changed, so that recording by angle multiplexing is possible.

When reproducing the recorded information, the reference light is incident on the hologram recording medium 1 as described above, and the light beam transmitted through the hologram recording medium 1 is reflected by the galvanometer mirror 516 so that the reproduction reference light is reflected. Generate. The reproduction light reproduced by the reproduction reference light propagates through the objective lens 510 and the angle filter 509. Thereafter, the reproduction light passes through the PBS prism 507 and enters the photodetector 518, and the recorded signal can be reproduced.

The optical system shown in FIG. 5 has an advantage that the size can be greatly reduced by making the signal light and the reference light incident on the same objective lens as compared with the optical system configuration shown in FIG.

FIG. 6 shows an operation flow of recording and reproduction in the optical information recording / reproducing apparatus 10. Here, a flow relating to recording / reproduction using holography in particular will be described.

FIG. 6A shows an operation flow from when the optical information recording medium 1 is inserted into the optical information recording / reproducing apparatus 10 until preparation for recording or reproduction is completed, and FIG. FIG. 6C shows an operation flow until information is recorded on the information recording medium 1, and FIG. 6C shows an operation flow until the information recorded on the optical information recording medium 1 is reproduced from the ready state.

When a medium is inserted as shown in FIG. 6A (601), the optical information recording / reproducing apparatus 10 discriminates whether or not the inserted medium is a medium for recording or reproducing digital information using holography, for example. (602).

As a result of disc discrimination, when it is determined that the optical information recording medium records or reproduces digital information using holography, the optical information recording / reproducing apparatus 10 reads control data provided on the optical information recording medium (603). ), For example, information relating to the optical information recording medium and information relating to various setting conditions during recording and reproduction, for example.

After reading out the control data, various adjustments according to the control data and learning processing (604) related to the pickup 11 are performed, and the optical information recording / reproducing apparatus 10 is ready for recording or reproduction (605).

As shown in FIG. 6B, the operation flow from the ready state to recording information is as follows. First, data to be recorded is received (611), and information corresponding to the data is received from the spatial light modulator in the pickup 11. Send to.

Thereafter, various recording learning processes such as optimization of the power of the light source 301 and optimization of exposure time by the shutter 303 are performed in advance so that high-quality information can be recorded on the optical information recording medium (612). ).

Thereafter, in the seek operation (613), the access control circuit 81 is controlled to position the pickup 11 and the cure optical system 13 at predetermined positions on the optical information recording medium. When the optical information recording medium 1 has address information, it reproduces the address information, checks whether it is positioned at the target position, and calculates the amount of deviation from the predetermined position if it is not positioned at the target position. And repeat the positioning operation.

Thereafter, a predetermined region is pre-cured using the light beam emitted from the cure optical system 13 (614), and data is recorded using the reference light and signal light emitted from the pickup 11 (615).

After recording the data, post cure is performed using the light beam emitted from the cure optical system 13 (616). Data may be verified as necessary.

As shown in FIG. 6C, the operation flow from the ready state to the reproduction of recorded information is as follows. First, in the seek operation (621), the access control circuit 81 is controlled, and the pickup 11 and the reproduction reference light are reproduced. The position of the optical system 12 is positioned at a predetermined position on the optical information recording medium. When the optical information recording medium 1 has address information, it reproduces the address information, checks whether it is positioned at the target position, and calculates the amount of deviation from the predetermined position if it is not positioned at the target position. And repeat the positioning operation.

Thereafter, reference light is emitted from the pickup 11, information recorded on the optical information recording medium is read (622), and reproduction data is transmitted (613).

FIG. 9 shows a data processing flow at the time of recording and reproduction. FIG. 9A shows the two-dimensional data on the spatial light modulator 312 after the recording data receiving process 611 in the input / output control circuit 90. FIG. 9B shows a recording data processing flow in the signal generation circuit 86 until conversion. FIG. 9B shows the process up to the reproduction data transmission processing 624 in the input / output control circuit 90 after the two-dimensional data is detected by the photodetector 325. The reproduction data processing flow in the signal processing circuit 85 is shown.

The data processing during recording will be described with reference to FIG. When user data is received (901), it is divided into a plurality of data strings, and each data string is converted to CRC (902) so that error detection at the time of reproduction can be performed. In order to prevent repetition, the data sequence is scrambled (903) to add a pseudo-random number data sequence, and then subjected to error correction coding (904) such as Reed-Solomon code so that error correction at the time of reproduction can be performed. Data rearrangement is performed by processing (905). Next, this data string is modulated (906), converted into M × N two-dimensional data, and repeated for one page of data to form two-dimensional data (907) for one page. A marker serving as a reference for image position detection and image distortion correction during reproduction is added to the two-dimensional data configured as described above (908), and the data is transferred to the spatial light modulator 312 (909).

Next, the data processing flow during reproduction will be described with reference to FIG. The image data detected by the photodetector 325 is transferred to the signal processing circuit 85 (911). Image position is detected based on the marker included in the image data (912), distortion such as image tilt, magnification, distortion, etc. is corrected (913), and then binarization processing (914) is performed to remove the marker. (915) to acquire (916) two-dimensional data for one page. The two-dimensional data obtained in this way is converted into a plurality of data strings by demodulation processing (917) and deinterleaving processing (918), and then error correction processing (919) is performed to remove the parity data strings. Next, descrambling processing (920) is performed, CRC error detection processing (921) is performed, CRC CRC is deleted, and user data is transmitted via the input / output control circuit 90 (922).

FIG. 7 is a block diagram of the signal generation circuit 86 of the optical information recording / reproducing apparatus 10.

When the input of user data to the output control circuit 90 is started, the input / output control circuit 90 notifies the controller 89 that the input of user data has started. In response to this notification, the controller 89 instructs the signal generation circuit 86 to record data for one page input from the input / output control circuit 90. A processing command from the controller 89 is notified to the sub-controller 701 in the signal generation circuit 86 via the control line 708. Upon receiving this notification, the sub-controller 701 controls each signal processing circuit via the control line 708 so that the signal processing circuits are operated in parallel. First, the memory control circuit 703 is controlled to store user data input from the input / output control circuit 90 via the data line 709 in the memory 702. When the user data stored in the memory 702 reaches a certain amount, the CRC calculation circuit 704 performs control to convert the user data into CRC. Next, the CRC-converted data is scrambled by adding a pseudo random number data sequence by a scramble circuit 705, and error correction encoded by adding a parity data sequence by an error correction encoding circuit 706, and rearranged and modulated by an interleave circuit 710 A control for modulation processing is performed according to 711. Finally, the pickup interface circuit 707 reads the modulated data from the memory 702 in the arrangement order of the two-dimensional data on the spatial light modulator 312, adds a reference marker at the time of reproduction, and then the space in the pickup 11. Two-dimensional data is transferred to the optical modulator 312.

FIG. 8 is a block diagram of the signal processing circuit 85 of the optical information recording / reproducing apparatus 10.

When the photodetector 325 in the pickup 11 detects the image data, the controller 89 instructs the signal processing circuit 85 to reproduce the data for one page input from the pickup 11. A processing command from the controller 89 is notified to the sub-controller 801 in the signal processing circuit 85 via the control line 811. Upon receiving this notification, the sub-controller 801 controls each signal processing circuit via the control line 811 so that the signal processing circuits are operated in parallel. First, the memory control circuit 803 is controlled to store the image data input from the pickup 11 via the pickup interface circuit 810 via the data line 812 in the memory 802. When the data stored in the memory 802 reaches a certain amount, the image position detection circuit 809 performs control to detect a marker from the image data stored in the memory 802 and extract an effective data range. Next, the image distortion correction circuit 808 performs distortion correction such as image inclination, magnification, and distortion by using the detected marker, and controls to convert the image data into the expected two-dimensional data size. Each bit data of a plurality of bits constituting the size-converted two-dimensional data is binarized by the binarization circuit 807 to determine “0” or “1”, demodulated by the demodulation circuit 814, and interleaved by the deinterleave circuit 813 Control is performed to store the rearranged data in the memory 802 in the order of the output of the reproduction data. Next, the error correction circuit 806 corrects an error included in each data string, and the scramble release circuit 805 releases the scramble to add the pseudo random number data string. Check not included. Thereafter, user data is transferred from the memory 802 to the input / output control circuit 90.

Here, the interleaving process 905 will be described in detail.

FIG. 1 is a schematic diagram showing an outline of one page of recorded data subjected to error correction coding (904). The error correction code 102 is added (904) to the user data 101 which has been CRC-added (902) to the recorded data (901) and converted into scrambled data (903), thereby forming the data 103 of one sector. A case will be described as an example where p-bit (p: natural number) sector data 103 to which parity 102 as an error correction code is added can be recorded in q sectors (q: natural number) as data that can be recorded on one page. One page of recording area 105 is divided into r (r: natural number) sub-page areas 106 having a block structure, and sector data 103 is allocated to the necessary sub-page areas 106. As described above, since the area condensed by the objective lens is substantially circular, the data area of the page data corresponding to the effective diameter of the objective lens is set as the effective data area. If the entire subpage of the subpage can be used as user data or the like, q × C bits (C: natural number) are allocated to the same number of bits (in this case, C bits) from each sector 103. Then, they are arranged according to a predetermined rule. Further, in the case of an area inscribed in the circumference of the effective data area, q × D bits (D: natural number, D <C) are assigned as the number of bits allocated to each subpage excluding the area corresponding to the outside of the circle. Adjust and arrange only in the valid data area according to a predetermined rule. However, even in this case, it is assumed that the same number of bits (for example, D bits) is allocated from each sector 103. Thereby, the data distributed to each subpage 106 can be distributed by the same number of bits from each sector 103. In FIG. 1, for simplification, the subpage 106 is described as a 4 × 4 block structure, and the page 105 is described as an 8 × 8 subpage structure, but the present invention is not limited to this size.

In this way, an integer multiple of the number of sectors is allocated as the number of valid data to subpages where the portion of valid data including user data is smaller than the area of other subpages in the circle. As a result, the data can be distributed by interleaving while guaranteeing the length of predetermined sector data (for example, data for one page). For example, when there are s subpages (s: natural number) in which the portion of valid data including user data is smaller than the area of other subpages in the circle, the data of valid data in each of the s subpages Allocate an integer multiple of the number of sectors as a number.

Although the data structure of the subpage 106 has been described as including only data extracted from each sector 103, the subpage 106 includes a reference pattern for detecting misalignment, subpage information, and the like. There is no problem even if it is configured.

Also, the order of distribution to the subpages 106 is shown in FIGS. 10 and 11, for example. The quadrant is divided into 90-degree areas from the center of the circle, with the X axis in the horizontal direction and the Y axis in the vertical direction, and divided into quadrants. For example, when r subpage data 106 exist as shown in FIG. 1, r / 4 subpages are distributed to each quadrant, and each quadrant X-direction left to right as shown in FIG. , In the Y direction from top to bottom (or from bottom to top), as shown in FIG. 11, from the center in the X direction to the outside and from the top to bottom (or from bottom to top) in the Y direction. For example, in the first quadrant, subpage No. From (1) to No. (R / 4), the second quadrant has a subpage No. (R / 4 + 1) to No. (R / 2), in the third quadrant, subpage No. (R / 2 + 1) to no. (3 * r / 4), subpage No. (3 * r / 4 + 1) to No. Arrange sequentially so that (r). Thus, by dividing the quadrants and arranging them equally, the processing can be performed independently and in parallel, and high-speed processing is possible.

FIG. 14 shows the processing procedure of the interleave processing 905. The recording area 105 on the spatial light modulator 312 is divided into r subpages 106 (1401). Next, p bits × q sectors of data 104 are extracted from each sector by the same number of bits (1402), and the block structure of the subpage 106 is constructed (1403). Next, the recording area 105 is divided into a plurality of quadrants (1404), and the subpage 106 is sequentially arranged (1405) for each quadrant. After that, data such as misalignment detection, brightness adjustment, medium-specific information and page unit information is arranged in each subpage 106 or page 105, and necessary page processing is performed after adding necessary arithmetic processing. 2D is planned. As a result, the sector data 103 can be evenly distributed to the subpages 106 in the page 105 and can be evenly arranged for each signal area. Therefore, there is no bias for each area, and even when there is a luminance variation or a local defect for each area at the time of reproduction, errors can be dispersed and correction ability can be improved. Note that although the quadrant of the recording area has been described as being divided into four, it is not limited thereto.

FIG. 12 is a schematic diagram showing an outline of one-page recording data according to the second embodiment of the present invention. The difference from FIG. 1 of the first embodiment is that the data arrangement from each sector 103 in the subpage 106 is specified.

At the time of interleaving, the same number of bits are allocated to each sub-page 106 for each sector data 103 so that the signal areas 105 can be evenly arranged. At this time, for example, when C bits are allocated from each sector 103 to one subpage 106, they are arranged in order from sector number 1 in a block structure of A × B (A, B: natural number). Further, the order of arrangement for each quadrant as shown in FIGS. 10 and 11 may be changed. Further, the order of arranging the data may be changed for each of a plurality of subpages or for each region. For example, in FIG. 12, the data arrangement order from left to right and from top to bottom corresponds to 1, 2,. . . . However, the arrangement order may be different for each of a plurality of subpages or regions.

Also, randomization may be performed on a bit basis based on a predetermined rule. In the processing procedure of FIG. 14, the sub-page 106 of 1403 is arranged using a predetermined rule.

According to the present embodiment, in addition to eliminating the bias in the page 105, it is possible to eliminate the bias in the subpage 106. Can be improved.

FIG. 13 is a schematic diagram showing an outline of one-page recording data according to the third embodiment of the present invention. The difference from FIG. 1 of the first embodiment is that the sector 103 structure has a product code format.

At the time of interleaving, the same number of bits are allocated to each sub-page 106 for each sector data 103 so that the signal areas 105 can be evenly arranged. At this time, the sector structure 103 having the first error correction code 107 in addition to the user data 101 has a product code format in which the second error correction code 108 is added to the data from each sector by a specific sector. Will be described. In this case, when allocating from each sector 103 to each subpage 106, the allocation is performed after shifting the position so that the second error correction code string varies. Also, the data is allocated to each subpage from a different data position in each sector.

According to the present embodiment, in addition to eliminating the bias in the page of the data string of the first error correction code string, the bias in the page 105 of the data string of the second error correction code string is eliminated. Therefore, it is possible to improve error correction capability by further distributing errors. In this embodiment, the data in the product code format has been described as an example. However, in the structure having the error correction code string only in the sector 103 as in the first embodiment, the subpage 106 of the sector data 103 is similarly displayed. It is also possible to adjust the bit positions to be allocated. In the processing procedure of FIG. 14, a predetermined rule is used when data is extracted from each sector 103 in 1402. Alternatively, the bit position allocated to the subpage 106 may be adjusted after randomizing the sector data 103 based on a predetermined rule.

In the embodiments so far, the description has been made by allocating the number of bits that is an integral multiple of the sector in any subpage. FIG. 15 is a schematic diagram showing an outline of one-page recording data according to the fourth embodiment of the present invention. A difference from FIG. 1 of the first embodiment is that the number of bits allocated to the subpage is not an integer multiple of the sector. For example, when there is q × D / 2 (D: natural number) as data to be allocated to subpages, the number of sectors is an integral multiple of two subpages allocated q × D / 2 bits. Adjust as follows. Note that the present embodiment is not limited to adjustment that is an integral multiple of the number of sectors for two subpages, and the portion of valid data including user data is smaller than the area of other subpages in the circle. When there are s subpages (s: natural number), adjustment may be made so that the number of sectors is an integral multiple of the number of sectors for s subpages.

In this embodiment, not only the size allocation but also the number of bits allocated to a plurality of subpages is set to be an integral multiple of the sector in the entire previous page, so that interleaving can be easily configured. By further relaxing the degree of freedom of the number of bits that can be allocated to sub-pages, it is possible to configure sub-pages in finer units and to realize capacity expansion.

In the embodiments so far, it has been described that user data can be distributed to each sub-page and can be configured to include a reference pattern for detecting displacement and sub-page information. FIG. 16 is a schematic diagram showing an outline of one-page recording data according to the fifth embodiment of the present invention. As one page data, information data such as data 1601 for detecting the position information of the rough page and data 1602 for indicating the boundary of the effective data area are arranged, and the data is configured to improve the reliability of decoding. Can be raised. In that case, it can be realized in the same way by allocating bits so as to be an integral multiple of the sector in the area excluding the information data of the data allocated to each subpage, as in the previous embodiments. .

In addition, this invention is not limited to the above-mentioned Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a 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. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

In addition, each of the above-described configurations, functions, processing units, processing means, and the like may be realized by hardware by designing a part or all of them with, for example, an integrated circuit. Each of the above-described configurations, functions, and the like may be realized by software by interpreting and executing a program that realizes each function by the processor. Information such as programs, tables, and files that realize each function can be stored in a memory, a hard disk, a recording device such as an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD.

Also, the control lines and information lines indicate what is considered necessary for the explanation, and not all the control lines and information lines on the product are necessarily shown. Actually, it may be considered that almost all the components are connected to each other.

DESCRIPTION OF SYMBOLS 1 ... Optical information recording medium, 10 ... Optical information recording / reproducing apparatus, 11 ... Pickup,
12 ... Reference light optical system for reproduction, 13 ... Disc Cure optical system,
14 ... Optical system for detecting disk 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,
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 ... Photodetector 501 ... Light source, 502 ... Collimating lens, 503 ... Shutter, 504 ... Optical element,
505 ... PBS prism, 506 ... signal light, 507 ... PBS prism, 508 ... spatial light modulator,
509 ... Angle filter, 510 ... Objective lens, 511 ... Objective lens actuator,
512 ... Reference light, 513 ... Mirror, 514 ... Mirror, 515 ... Lens,
516 ... Galvano mirror, 517 ... Actuator, 518 ... Photo detector,
519: Polarization direction conversion element, 520: Driving direction, 521: Optical block,
101 ... User data, 102 ... Error correction code, 103 ... Sector data, 104 ... All sector data,
105: page data, 106: subpage data, 107: first error correction code,
108 ... second error correction code,
701: Sub controller, 702: Memory, 703: Memory control circuit,
704 ... CRC calculation circuit, 705 ... scramble circuit, 706 ... error correction coding circuit,
707 ... Pickup interface circuit, 710 ... Interleave circuit,
711 ... modulation circuit,
801 ... Sub-controller, 802 ... Memory, 803 ... Memory control circuit,
804 ... CRC calculation circuit, 805 ... descrambling circuit, 806 ... error correction circuit,
807 ... Binarization circuit, 808 ... Image distortion correction circuit, 809 ... Image position detection circuit,
810: Pickup interface circuit, 813: Deinterleave circuit,
814. Demodulator circuit

Claims (13)

An optical information recording apparatus for recording information on an information recording medium using holography,
A signal generator for generating two-dimensional data;
A two-dimensional light modulator that displays the two-dimensional data and spatially modulates transmitted or reflected light,
The signal generation unit adds p (p: natural number) bit sector data by adding an error correction code to the data, configures page data by q (q: natural number) sectors,
The signal generation unit includes r (r: natural number) sub-regions so that an area to be displayed on the two-dimensional light modulation unit includes sub-pages in which the effective data portion is smaller than the other sub-page regions. An optical information recording apparatus, characterized in that two-dimensional data is generated so that effective data divided into pages and distributed to each subpage is an integral multiple of the number of sectors. The optical information recording apparatus according to claim 1,
The signal generation unit divides the signal region of the two-dimensional light modulation unit into n (n: natural number) quadrants from the center of the region, and sequentially distributes data to r / n subpages in each quadrant. An optical information recording apparatus that generates two-dimensional data. The optical information recording apparatus according to claim 2,
The optical information recording apparatus, wherein the signal generation unit sequentially distributes data from the center of the signal area to the outer subpage for each quadrant to generate two-dimensional data. The optical information recording apparatus according to claim 2,
The optical information recording apparatus, wherein the signal generation unit sequentially distributes data from the outside of the signal area to the central subpage for each quadrant to generate two-dimensional data. The optical information recording apparatus according to claim 1,
The optical information recording apparatus, wherein the signal generation unit generates two-dimensional data so that an arrangement order of data in a block structure of a subpage is different for each of one or a plurality of the subpages. The optical information recording apparatus according to claim 1,
The optical information recording apparatus, wherein the signal generation unit generates two-dimensional data so as to be distributed to each subpage from a different data position in each sector. An optical information recording apparatus for recording information on an information recording medium using holography,
A signal generator for generating two-dimensional data;
A two-dimensional light modulator that displays the two-dimensional data and spatially modulates transmitted or reflected light,
The signal generation unit adds p (p: natural number) bit sector data by adding an error correction code to the data, configures page data by q (q: natural number) sectors,
The signal generation unit includes r (r: natural number) sub-regions so that an area to be displayed on the two-dimensional light modulation unit includes sub-pages in which the effective data portion is smaller than the other sub-page regions. An optical information recording apparatus, characterized in that it is divided into pages, and two-dimensional data is generated so that the arrangement order of the data in the block structure of the subpages is different for each of the divided subpages. An optical information recording apparatus for recording information on an information recording medium using holography,
A signal generator for generating two-dimensional data;
A two-dimensional light modulator that displays the two-dimensional data and spatially modulates transmitted or reflected light,
The signal generation unit adds p (p: natural number) bit sector data by adding an error correction code to the data, configures page data by q (q: natural number) sectors,
The signal generation unit includes r (r: natural number) sub-regions so that an area to be displayed on the two-dimensional light modulation unit includes sub-pages in which the effective data portion is smaller than the other sub-page regions. An optical information recording apparatus, characterized in that two-dimensional data is generated so as to be divided into pages and distributed to sub-pages from different data positions in each sector. An optical information recording method for recording information on an information recording medium using holography,
A sector data configuration step of adding p (p: natural number) bit sector data by adding an error correction code to the data;
a page data configuration step of configuring page data by q (q: natural number) sectors;
A sub-page dividing step of dividing an area to be displayed on the two-dimensional light modulation unit into r (r: natural number) sub-pages;
An extraction step for extracting data such that valid data distributed to each subpage is an integral multiple of the number of sectors;
A subpage configuration step for configuring a subpage with the extracted data;
A quadrant dividing step of dividing an area in the page into a plurality of quadrants;
An arrangement step of arranging the subpage configured in the subpage configuration step for each quadrant divided in the quadrant division;
An optical information recording method comprising: An optical information recording method for recording information on an information recording medium using holography,
A sector data configuration step of adding p (p: natural number) bit sector data by adding an error correction code to the data;
a page data configuration step of configuring page data by q (q: natural number) sectors;
A subpage dividing step of dividing an area to be displayed on the two-dimensional light modulation unit into r (r: natural number) subpages having a block structure of A × B bits (A, B: natural number);
An extraction step for extracting data such that valid data distributed to each subpage is an integral multiple of the number of sectors;
A subpage configuration step of configuring a subpage with the extracted data so that the arrangement of data from the sector data for each subpage is different;
A quadrant dividing step of dividing an area in the page into a plurality of quadrants;
An arrangement step of arranging the subpage configured in the subpage configuration step for each quadrant divided in the quadrant division step;
An optical information recording method comprising: An optical information recording method for recording information on an information recording medium using holography,
A sector data configuration step of adding p (p: natural number) bit sector data by adding an error correction code to the data;
a page data configuration step of configuring page data by q (q: natural number) sectors;
A sub-page dividing step of dividing an area to be displayed on the two-dimensional light modulation unit into r (r: natural number) sub-pages;
An extraction step of extracting data so that effective data distributed to each subpage is an integral multiple of the number of sectors, so as to distribute to each subpage from different data positions of each sector;
A subpage configuration step for configuring a subpage with the extracted data;
A quadrant dividing step of dividing an area in the page into a plurality of quadrants;
An arrangement step of arranging the subpage configured in the subpage configuration step for each quadrant divided in the quadrant division step;
An optical information recording method comprising: An optical information recording apparatus for recording information on an information recording medium using holography,
A signal generator for generating two-dimensional data;
A two-dimensional light modulator that displays the two-dimensional data and spatially modulates transmitted or reflected light,
The signal generation unit adds p (p: natural number) bit sector data by adding an error correction code to the data, configures page data by q (q: natural number) sectors,
The signal generation unit divides an area to be displayed on the two-dimensional light modulation unit into r (r: natural number) subpages, and there is a subpage in which a portion of valid data is smaller than an area of another subpage. An optical information recording apparatus that generates two-dimensional data so that when s (s: natural number) are included, the effective data of s subpages is an integral multiple of the number of sectors. The optical information recording apparatus according to claim 12,
The optical information recording apparatus, wherein the signal generation unit generates two-dimensional data so that effective data distributed to each s subpages is an integral multiple of the number of sectors.

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