WO2014162580A1 - Information recording and playback device and recording method - Google Patents

Abstract

Due to properties of a hologram recording medium, according to a formation state of an already-recorded hologram recording unit, optimal recording positions when performing recording of recording units in the vicinity of the already-recorded recording unit are different. Specifically, if within a specific amount of time from having performed recording of one recording unit, it is possible to record the next recording unit in a region separated by a first interval; however, after a predetermined amount of time has elapsed, it is necessary to record the next recording unit in a region separated by a second interval. To this end, a recording method that is suitable for the above-mentioned properties is desired, and therefore, it is necessary to provide a suitable recording method for hologram recording. A recording and playback device for an optical information recording medium is characterized by: having a drive unit which executes data recording to the optical information recording medium, and a control unit which controls recording and playback by the drive unit; and the drive unit, when recording data to the vicinity of an already-recorded recording unit in a recording medium for which positions of recording units are established in advance, recording to the recording unit region that is closest to the already-recorded recording unit if the amount of time that has elapsed since performing recording to the already-recorded recording unit is less than a predetermined amount of time, and, if the amount of time that has elapsed since performing recording to the already-recorded recording unit is greater than or equal to the predetermined amount of time, recording the data to a recording unit at a position that is separated by at least one recording unit from the already-recorded recording unit.

Description

Information recording / reproducing apparatus and recording method

The present invention relates to a hologram drive device that records and reproduces information from a recording medium using holography.

As one of the technologies for increasing the capacity of storage, an interference fringe pattern generated when signal light having page data information two-dimensionally modulated by a spatial light modulator is superimposed on reference light inside a recording medium. Therefore, a hologram recording / reproducing technique for recording information on a recording medium by causing refractive index modulation in the recording medium has been devised.

As a hologram recording technique, for example, there is JP-A-2004-272268 (Patent Document 1). According to this publication, “in the method of forming and reproducing a hologram according to the present invention, the first hologram is generated on the holographic medium using the first reference light and the first signal light, and the first signal is generated. The light has a waist, and the second hologram is generated using a second reference light and a second signal light that are the same as the first reference light, and the second signal light also has a waist. At least a portion of the second hologram is spatially superimposed on the first hologram, however, the waist portion of the first signal light is at the same position as any portion of the waist of the second signal light. The first hologram is spatially separated from the second hologram, wherein the first hologram is generated in the first portion of the output light, and at least the second hologram is . The output light generated in the second portion of the output light is described as being filtered to include only reading of substantially the first hologram. ".

JP 2004-272268 A

Due to the nature of the hologram recording medium, the optimum recording position for recording in the recording unit differs in the vicinity of the recorded recording unit depending on the hologram forming state of the recorded recording unit. Specifically, it is possible to perform recording for the next recording unit in an area at a first interval within a predetermined time after recording for one recording unit, but when a predetermined time has elapsed, Next, it is necessary to record the next recording unit in the second interval area. Therefore, a recording method suitable for the above properties is desired.

An object of the present invention is to provide an appropriate recording method in hologram recording.

The above problem can be solved by determining the current recording area according to the elapsed time from the previous recording when the next recording is performed after the recording.

According to the present invention, data can be appropriately recorded according to the recording state.

Schematic of recording position of recording unit on unrecorded recording medium Schematic diagram of recording positions in recording units Schematic diagram of recording positions in recording units Schematic diagram of correspondence table of recording address and recording position Schematic diagram of hologram formed in recording medium Schematic diagram of hologram formed in recording medium Schematic diagram of recording positions in recording units Schematic diagram of recording positions in recording units Schematic diagram of recording positions in recording units Schematic diagram of recording positions in recording units Schematic diagram of correspondence table of usage status for recording addresses Schematic diagram of recording positions in recording units Schematic diagram of recording positions in recording units Schematic diagram showing an embodiment of an optical information recording / reproducing apparatus Schematic diagram showing an embodiment of an optical information recording / reproducing apparatus Schematic diagram of recording position of recording unit in conventional example Schematic of correspondence table of availability for recording addresses Schematic diagram of recording positions in recording units Schematic diagram of recording positions in recording units Schematic diagram of recording positions in recording units Schematic diagram of recording position of recording unit in conventional example Schematic diagram of recording positions in recording units Recording process flow chart

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

The recording image and characteristics of the recording medium in hologram recording will be described.

FIG. 3 shows a hologram formation image on the recording medium. 301 is signal light on which information is superimposed, and 302 is reference light. The signal light and the reference light are superposed in the recording medium, and the monomer in the recording medium moves and polymerizes in the interference fringe pattern generated at this time, and a refractive index distribution corresponding to the interference fringe pattern is formed to record information. To record. Reference numeral 303 denotes an area where a hologram is formed.

If the polymerization is started after the start of recording and is less than the time T determined by the characteristics of the recording medium, the next data may be recorded at a first interval (hereinafter referred to as L1). it can. L1 is an interval that should be kept at a minimum when recording a recording unit in the vicinity of a recorded recording unit.

In addition, when the time T or more has elapsed from the start of recording, the polymerization in the recording medium is completed, and the regions where the interference fringes are formed cannot be overlapped. (Hereinafter referred to as L2) is required to be recorded.

FIG. 4A shows a hologram formation image when a plurality of holograms 401 to 405 are recorded.

Since the hologram was recorded as in 401, and it was less than time T since the 401 was recorded, the first interval L1 was placed from the portion 406 in the center of the medium 401 where the hologram width is minimum. 402 is recorded. Similarly, since it was less than time T since 402 was recorded, it shows that 403 was recorded from 402 to L1. Further, since time T or more has elapsed since 403 was recorded, it is indicated that 404 was recorded with L2 being the second interval apart. Further, since it was less than time T since 404 was recorded, it indicates that 405 was recorded with L1.

FIG. 4B shows an image viewed from the top of the medium, with the central portion of each hologram in FIG. 4A simplified as a recording unit. The square in FIG. 4B corresponds to the hologram portion at the center of the recording medium. The medium center of the 401 area is the recording unit area 1, the medium central of the 402 is the recording unit area 2 (and so on), and the recording unit area 2 and the recording unit areas 2 to L1 are spaced apart from the recording unit area 1. The recording unit area 3 is shown at a separated position, the recording unit area 4 is shown at a position L2 away from the recording unit area 3, and the recording unit area 5 is shown at a position away from the recording unit area 4 by L1.

Hereinafter, this simplified version will be described as a recording image of a hologram recording unit.

As a recording method of the recording unit to cope with the hologram recording with the time restriction described above, a method of determining a recording position of the recording unit in advance and a method of determining the recording position at the time of recording can be considered. In the present invention, a recording method of these recording units will be described, and it will be shown that data can be appropriately recorded according to the recording state.

By making the intervals between recording units all L2 or more and uniquely associating the unique address with the recording position on the recording medium, data can be recorded appropriately according to the recording state, depending on the recording state of the recording unit. FIG. 5A shows that there is no need to adjust the interval between the recording units, and FIG.

The realization method of this method is shown using the information recording / reproducing apparatus shown in FIGS.

First, the basic operation of the information recording / reproducing apparatus shown in FIGS. 8 and 9 will be described.

FIG. 8 is a block diagram showing an information recording / reproducing apparatus using holography. The information recording / reproducing apparatus 801 includes a control unit 802 and a drive unit 803 and is connected to an external network 810 and / or an external memory 811. The external memory may be anything as long as it can hold information, such as an HDD, SSD (Solid State Drive), or an optical information recording medium. At the time of recording, the information recording / reproducing apparatus 801 receives recording data from the external network 810 or the external memory 811. The control unit 802 transfers the received data to the drive unit 803 and issues a recording instruction. The drive unit 803 records the received data on the optical information recording medium 820. At the time of reproduction, the data read from the optical information recording medium 820 by the drive unit 803 is transferred to the control unit 802 and transmitted from the information recording / reproducing apparatus 801 to an external network or an external memory.

FIG. 9 is a block diagram showing a drive unit 803 that performs recording and reproduction of an optical information recording medium that 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. The external control device 91 may be the control unit 802 in FIG. 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.

The procedure for recording on the recording medium shown in FIG. 5A using the information recording / reproducing apparatus described above will be described.

By the recording start instruction and the recording data transfer from the control unit 802 to the drive unit 803, the position is controlled by the disk rotation motor control circuit 88 and the access control circuit 81 according to the instruction from the controller 89, and picked up at the position corresponding to the address Is moved to the recording position of the recording unit area 1. Next, the light source driving circuit 82 is controlled by an instruction from the controller 89, and recording is performed by irradiating the signal light and the reference light using the pickup 11. The same applies to the recording unit area 2 and thereafter.

Thus, there is no time restriction when recording in the vicinity of the recorded recording unit, and it is not necessary to adjust the recording position of the recording unit, so that handling becomes easy.

Next, it is shown that the recordable area of the recording medium can be used efficiently by preliminarily associating the unique address and the recording position on the recording medium with all the intervals between the recording units as the interval L1.

FIG. 5B is a schematic diagram of recording positions of recording units determined in advance in this example. It indicates that the recording position is associated with the interval of the recording unit area being L1 or more in advance. FIG. 5C is an image diagram when recording is performed in FIG.

This indicates that recording was performed in the recording unit area 1 because the recording unit area 1 was recorded and the elapsed time after recording was less than the time T. Since the time T or more after recording in the recording unit area 2 has elapsed, it is necessary to separate the recording unit area 2 from the recording unit area 2 by L2 or more. In this example, the recording unit area 3 is skipped and recorded in the recording unit area 4 Show.

The realization method of this system is shown using the information recording / reproducing apparatus shown in FIGS. Data transfer from the control unit 802 to the drive unit 803, position control and recording control in the drive unit 803 are the same as those in the first embodiment. The recording unit area 1 corresponding to the address is positioned and recorded in the recording unit area 1. In addition to recording, the controller 89 measures the time from the start of recording. When recording in the next recording unit, it is determined whether or not the measured time is less than the time T. If it is less than time T, the recording unit position corresponding to the address is positioned and recorded. When the time T or more has elapsed, it is necessary to separate L2 from the position of the recorded recording unit. Since the position of each recording unit is determined in advance, recording is performed at a position where one or more recording units are skipped so that the interval from the next recording position is L2 or more.

The controller 89 generates management information shown in FIG. This is information for managing the usage status of the recording unit area because there is a skipped recording unit area. It includes at least two of a unique address assigned to each recording unit and flag information indicating the usage status. Flag information indicating that the recording unit area has been used (denoted as “use” in FIG. 6) is used in the flag information of the used recording unit area. Flag information of the recording unit area that has not been used because of skipping is not used. It is flag information (denoted as un-use in FIG. 6).

Use this management information during playback. When reproducing data, the controller 89 can identify the recording unit area used by referring to this management information, position it at the corresponding position, and irradiate the reference light to obtain the desired data. Can be obtained.

In this method, in data transfer from the control unit 802 to the drive unit 803, when data is continuously transferred so that the time interval at the start of recording between recording units is less than time T, the recording unit interval becomes L1. Thus, the recordable area can be used efficiently. Even when the time interval is equal to or greater than time T, there is no practical problem because recording can be performed with a distance of L2 or greater.

As described above, according to the present invention, data can be appropriately recorded according to the recording state.

A recording method that is effective when the control unit 802 transfers data to the drive unit 803 in units of N recording units will be described. A recording method in which the recording position of a recording unit is set in advance, the recording unit interval of consecutive N recording units is L1, and the interval of L2 is determined in advance for each N recording units will be described. It shows that data can be recorded appropriately.

FIG. 7A is a schematic diagram of recording positions of recording units determined in advance in this example. In FIG. 7A, N = 3, the interval between the three recording units is L1, and the unique address and the recording position on the recording medium are uniquely set as the L2 interval for every three recording units. Indicates that it is associated with. N may be a fixed value or a variable value.

FIG. 7 (b) is an image diagram when recording is performed in FIG. 7 (a). It shows that three recording units were recorded from the control unit, then two recording units were recorded, and finally three recording units were recorded after a time T or more.

First, three recording units are recorded from the recording unit area 1 to the recording unit area 3, and then two recording units are recorded in the recording unit area 4 and the recording unit area 5. Since more than T time has elapsed since the recording area 5 was recorded, it is necessary to separate it from the recording unit area 5 by L2 or more. In this example, the recording unit area 6 is skipped, and the next three recording units are recorded from the recording unit area 7 to the recording unit. It shows that it recorded in the area | region 9.

The realization method of this method is shown using the information recording / reproducing apparatus shown in FIG. 8 and FIG. Data transfer from the control unit 802 to the drive unit 803, position control and recording control in the drive unit 803 are the same as those in the first embodiment. The recording unit area corresponding to the address is positioned and recorded in the recording unit area. In addition to recording, the controller 89 measures the time from the start of recording. When recording the next recording unit, it is determined whether or not the measured time is less than the time T. If it is less than time T, the recording unit position corresponding to the address is positioned and recorded. When the time T or more has elapsed, it is necessary to separate L2 from the position of the recorded recording unit. Since the position of each recording unit is determined in advance, recording is performed at a position where one or more recording units are skipped so that the interval from the next recording position is L2 or more.

At this time, as in the first embodiment, information indicating the usage status of the recording unit area is managed using the information shown in FIG. During playback, playback is performed in the same procedure as in the first embodiment.

In this method, in data transfer from the control unit 802 to the drive unit, if data is continuously transferred so that recording unit data corresponding to a predetermined number of recording units can be recorded within a predetermined time, Since recording can be performed at a recording position of a determined recording unit, recording position management can be performed by a simple procedure. Even if the number of recording units is not determined in advance, there is no practical problem because it is possible to record at a distance of L1 or L2 or more after determining the elapsed time T.

As described above, according to the present invention, data can be appropriately recorded according to the recording state.

Next, a recording method for determining the recording position of the recording unit at the time of recording will be described, and it will be shown that data can be appropriately recorded according to the recording state.

1A shows a recording start position when recording is performed on an unrecorded recording medium, and FIGS. 1B and 1C show recording images of recording units of the recording medium according to the present system. A procedure for recording by determining the position of the recording unit as shown in FIGS. 1B and 1C will be described.

FIG. 1A shows that the recording unit area 1 is determined with the recording position 101 determined in advance as the recording start position when recording on an unrecorded recording medium.

FIG. 1B shows that the recording unit area 2 is recorded at a position separated from the recording unit area 1 by L1 since it has been less than time T since the recording was performed on the determined recording unit area 1 and the recording unit area 1 was recorded. Indicates that the decision has been made and recorded. The same applies to the recording unit areas 3 to 5 thereafter.

Next, since time T or more has elapsed since recording in the recording unit area 5, the position of the recording unit area 6 is determined at a position L2 away from the recording unit area 5, and recording is performed. Since the recording unit area 5 is less than the time T since recording, the position of the recording unit area 7 is determined at a position separated from the recording unit area 6 by L1, indicating that recording has been performed.

The realization method of this system is shown using the information recording / reproducing apparatus shown in FIGS. Data transfer from the control unit 802 to the drive unit 803, position control and recording control in the drive unit 803 are the same as those in the first embodiment. In the case of an unrecorded recording medium, it is recorded at a predetermined position. When recording is started, the controller 89 measures the elapsed time from the start. When recording the next data, if the elapsed time is less than T, the controller 89 determines the recording position of the next recording unit at a position separated from the recorded position by L1, and if the elapsed time is T or more. For example, the recording position of the next recording unit is determined at a position separated from the recorded position by L2, and the recording position information for the address is held.

Fig. 14 shows the recording method in this method. In step 1401, it is determined whether or not the recording is on an unrecorded medium. If the recording is to an unrecorded medium, the process proceeds to step 1402, and the specified position is determined as the recording start position. If there is a recorded recording unit, the process advances to step 1403 to determine whether the elapsed time from the previous recording is T or more. If the elapsed time is less than T, the process proceeds to step 1404, and the position of the next recording unit is determined at a position separated from the recorded position by L1. If the elapsed time from the previous recording is equal to or longer than T, the process proceeds to step 1405, and the position of the next recording unit is determined at a position away from the recorded position by L2. In step 1406, the determined recording position information is held. In step 1407, recording is performed at the determined position, and in step 1408, measurement of elapsed time from recording is started.

FIG. 2 shows an example of information associating the unique address of each recording unit with the position on the recording medium when the arrangement of the recording unit area is determined as shown in FIG. This is information regarding the position on the recording medium determined by the controller 89 with respect to the unique address when determining the recording position. For example, the recording unit area 1 is indicated as Addr1, and the position information is information of radius r = 1 and angle Θ = 1. Here, the radius and angle are used as the information representing the coordinates on the disk, but any information can be used as long as the physical position on the disk can be determined, such as an X, Y coordinate system. Although L1 and L2 are also shown as distances, they may be expressed as angles Θ1 and Θ2.

Suppose that the information shown in FIG. 2 is stored at a predetermined position on the recording medium. At the time of reproduction, the information is positioned at the predetermined position and the information shown in FIG. 2 is read out. The position information on the recording medium corresponding to the address is acquired from the read information of FIG. 2, positioned, and reproduced.

Also, L1 and L2 are wider than L1 due to the characteristics of hologram recording.

L1 is an interval at which high quality can be maintained with respect to the reproduction quality of neighboring recording units, since the holograms formed in each recording unit as shown in FIG. It may be determined according to the recording medium specifications, drive specifications, and recording medium characteristics, and may be a distance specified by the control unit 802 to the drive unit 803 as long as it is equal to or greater than the above-described reproduction quality ensuring distance. .

For example, when recording management information on a recording medium, since it is desirable that the reproduction quality is high, it is possible to set a wider interval than L1 and improve the reliability of the information.

As shown in FIG. 3B, L2 is a non-overlapping interval because recording cannot be performed in an area overlapping with the recording area of the recording unit after a time T has elapsed since recording in the recording unit area is performed. It may be determined according to the specifications or the specifications of the drive, and may be a distance specified by the control unit 802 to the drive unit 803 as long as it is greater than the above-described distance.

In this way, by determining the recording position of the recording unit based on the elapsed time since recording the recorded recording unit area at the time of recording, the recording position can be determined flexibly, and appropriate depending on the recording state Can record data.

When the data is continuously transferred from the control unit 802 to the drive unit 803 so that the recording time interval of the recording unit is less than the time T, the use efficiency of the recordable area as in the first embodiment is obtained.

In this embodiment, it is shown that even a disc including a defect can be reliably recorded on the disc by applying the recording method according to the present invention.

The recording area of the disc including the defect is shown in FIG. FIG. 10A shows that a defect 1101 exists in a recording area of a disc that is divided into recording single areas and each assigned a unique address. Hereinafter, the effect of the present invention will be described by taking as an example the case of recording data in the recording area of the disc shown in FIG. 10A in the information recording / reproducing apparatus shown in FIG.

In the information recording / reproducing apparatus shown in FIG. 9, the controller 89 obtains position information regarding the defective area before recording, and recognizes that the defect 1001 exists in the recording unit areas 2, 3, and 4. In addition, the recording area where data is to be recorded is determined by avoiding the location. The position information of the defective area is stored in advance in a medium such as an RFID attached to a cartridge for storing a recording medium, or is generated by a defect search process performed in the information recording / reproducing apparatus.

At the same time, the controller 89 generates the management information shown in FIG. This figure is information for managing whether or not each recording unit area is a defective area, and includes at least two of an address assigned to each recording unit and flag information indicating the state. The flag information of the address of the recording unit area where the defect exists is flag information indicating that the defect exists (denoted as NG in FIG. 10B), and the flag of the address of the normal recording unit area where the defect does not exist The information is flag information indicating this (indicated as OK in FIG. 10B).

The above management information is used when reproducing data. If the controller 89 refers to the management information when reproducing data, the normal recording area can be specified, and the data recorded on the disc can be read out reliably.

The above recording method is effective when the position of each recording unit area shown in the first and second embodiments is determined in advance. The position of each recording unit area is shown in the third embodiment. When recording data, the position of the recording unit area may be determined according to the following procedure. The procedure will be described by taking as an example a case where data is recorded by the information recording / reproducing apparatus shown in FIG. 9 on a disk having a defect in the recording area of the disk shown in FIG.

FIG. 11 shows a recording area of the disc, and shows a state in which data has already been recorded in the recording unit areas 1, 2 and 3. When data is recorded in these recording unit areas and data is newly recorded on the disc in such a state, in the information recording / reproducing apparatus shown in FIG. 9, the controller 89 relates to the position and size of the defect area 1101. Get information. Based on this information, the recording unit area 4 where data is to be recorded next is determined at a position spaced from the defect area 1101 by an interval L3. In this way, since the recording unit area can be arranged in a normal area without a defect, it is possible to realize reliable data recording on a disc including a defect. The information on the position and size of the defect is stored in advance in a medium such as an RFID attached to a cartridge for storing the recording medium, or is generated by a defect search process performed in the information recording / reproducing apparatus. .

As described above, by applying the recording method according to the present invention, it is possible to reliably record data on a disc even if the disc includes a defect.

The procedure for determining the recording position of the recording unit area when recording is performed after the curing process, and the recording position of the recording unit can be determined even when the curing process is involved, and data can be recorded appropriately according to the recording state Indicates.

In hologram recording, before performing recording by irradiating signal light and reference light as described above, a pre-process called pre-cure for irradiating light to a recording area in advance may be performed. The size of the area to be cured at a time is determined by the recording medium specification or drive specification.

In this example, the cure size is fixed, and it is assumed that three recording units can be stored in one cure area with the interval between recording units as L1.

Fig. 12 (a) shows a recording image diagram when recording is performed with emphasis on quality. FIG. 12A shows that recording positions of recording units are determined in the cure area, and recording of 6 recording units is performed. Originally, three recording units can be arranged in the cure area, but the recording position is determined by setting the interval between the recording units to L4 so that the recording unit interval is wider than L1 and two recording units are arranged in the cure area. , Indicating that it was recorded. By making it wider than L1, it is possible to suppress the mixing of noise components from adjacent recording unit areas, and the recording quality is improved.

The realization method will be described using the information recording / reproducing apparatus shown in FIGS. In accordance with an instruction from the controller 89, position control is performed by the disk rotation motor control circuit 88 and the access control circuit 81, and the position 1204 is positioned at a position where it can be cured. Next, curing is performed by controlling the light source driving circuit 82 and emitting a light beam from the curing optical system 13. The controller 89 determines the number of recording units to be recorded in the cure area according to the quality level. Here, the number is determined to be two, the recording position of the recording unit is determined at the position of L4 where the distance between the recording units is wider than L1, and the determined position is positioned and recorded. The same operation is performed in the areas 1205 and 1206.

As described above, since the distance between the recording units can be set wider than L1, the mixing of noise components from the neighboring recording unit area can be suppressed, so that the recording quality is improved.

As described above, it is possible to determine the recording position with emphasis on recording quality, but it is also possible to determine the recording position with emphasis on capacity.

FIG. 12B shows a recording image when recording is performed with emphasis on capacity. In this example, three recording units that are the maximum number of recording units that can be recorded in the cure area are recorded. In the area 1207, the recording unit 1 to the recording unit 3 is determined with the distance between the recording units as L1, and the recording position is recorded. The 1207 area is cured, and recording is performed at the determined recording unit position. The same applies to the area 1208.

Thus, the maximum number of recording units that can be recorded in the cure area can be recorded, and the recordable capacity can be used effectively.

Even in the case of emphasizing recording quality and the example of emphasizing capacity, since the recording position is managed using the recording position information shown in FIG. 2, the recording position of the recording unit can be determined flexibly, and the recording state Data can be recorded appropriately according to the situation.

Indicates that even when the cure size can be changed, data can be recorded appropriately according to the recording state.

Example 5 shows an example in which the size of a cure area that can be cured at a time is fixed. However, a recording procedure and a management method when the cure size can be changed by the cure optical system of the recording / reproducing apparatus in FIG. 9 will be described.

Suppose that data for three recording units is transmitted from the control unit 802 to the drive unit 803, then data for two recording units and finally two recording units are transmitted.

FIG. 13A is an image diagram of a cure area and a recording unit when recording is performed when a recording position is determined in advance corresponding to an address. This shows that the area to be cured is changed according to the recording size.

9 shows an implementation method when recording is performed as shown in FIG. 13A using the information recording / reproducing apparatus shown in FIG. 9 and shows that data can be appropriately recorded according to the recording state.

Position control when performing curing, cure control, position control during recording, and recording processing are the same as in the fifth embodiment. Since the first three pieces of data are recorded from the recording unit area 1 to the recording unit area 3, it is necessary to cure these areas. The controller 89 determines the size of the cure area to be 1301, adjusts the cure size, performs cure, and records from recording unit 1 to recording unit 3.

Since the next two recording units are recorded in the recording unit area 4 and the recording unit area 5, the cure area is determined as the area 1302 by the controller 89 and is recorded in the recording unit 4 and the recording unit 5 after the curing.

The last two recording units are recorded in the recording unit area 7 and the recording unit area 8 because the recording unit area 6 is cured and used. Therefore, the controller 89 determines the cure area 1303, performs the cure by adjusting the cure size, and records the recording unit area 7 and the recording unit area 8.

Further, the controller 89 generates the management information shown in FIG. 6 as in the first and second embodiments, and performs reproduction using the generated management information.

FIG. 13B is an image diagram of the cure area and the recording unit when recording is performed when the recording position is determined during recording. This shows that the area to be cured is changed according to the recording size.

FIG. 13 shows a realization method when recording is performed as shown in FIG. 13B using the information recording / reproducing apparatus shown in FIGS. 8 and 9, and data can be appropriately recorded according to the recording state. Show.

Position control during curing, cure control, position control during recording, and recording processing are the same as in the fifth embodiment. The controller 89 calculates that the number of recording units to be recorded is three from the total size of the data received from the control unit and the size of the recording unit. The recording position and cure size of the recording unit are adjusted so that the interval between the three recording units is L1, and the recording unit interval for each cure unit is L2. The 1304 area is cured with the determined size. After curing, the recording unit area 1 to the recording unit area 3 are recorded at the determined recording position. The same applies to the subsequent steps, and it is calculated that the number of recording units to be recorded is two from the total size of the data received from the control unit and the size of the recording units. The recording position and cure size of the recording unit are adjusted so that the interval between the two recording units is L1, and the recording unit interval for each cure unit is L2. The 1305 area and the 1306 area are cured with the determined size, and recording is performed at the determined recording position after the curing.

Since the recording unit interval in each cure area is L1, the recording position is determined accordingly. The recording interval is L1, but it may be a distance greater than L1. In addition, although the recording unit interval for each cure unit is L2, it may be a distance of L2 or more.

As described above, even in the case where the curing process is involved, even in the recording method in which the recording position is determined in advance or the recording method in which the recording position is determined, the data can be appropriately recorded according to the recording state. .

The example in which the recording position is determined by the elapsed time from the time when the recorded recording unit was recorded has been described. On the premise that the next recording data is transmitted from the control unit 802 to the drive unit 803 in less than time T. A method of predetermining before recording may be used.

For example, on the assumption that the control unit continuously transmits recording data to the drive unit, a recording area size is specified and a recording area securing request is made. The drive unit may calculate the number of recording units from the designated data size and the data size of the recording unit, and determine the recording positions for the calculated number of recording units. The recording position is determined, and the secured recording size is notified from the drive unit to the control unit. For reasons of the cure size, there may be a case where a larger recording size than the specified size is ensured, and therefore the control unit receives a size larger than the requested size as a response when securing. In this case, the data can be appropriately recorded by continuously transmitting the recording data of the notified size to the drive unit instead of the size originally scheduled to be recorded.

A method of determining a recording position of the recording unit at a position at a first interval or a second interval from the recorded recording unit according to an elapsed time after recording the recorded recording unit; A method of determining the position at the second interval regardless of the elapsed time after that may be selected from the control unit. The drive unit performs recording by a method designated by the control unit.

Also, this embodiment can be expressed as follows. That is, in an archive system for recording data in a holographic memory in response to a request from a host, a drive for recording data in the holographic memory, a controller for controlling the drive, and a table indicating addresses on the holographic memory The table stores the position on the holographic memory of data that can be recorded in advance according to the recording unit. When the controller writes data from the host at a position different from the position on the holographic memory of data that can be recorded in advance according to the recording unit when performing recording in response to a data write request from the host Updates the written data and the position on the holographic memory in the table.

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 for realizing each function can be stored in a recording device such as a memory, a hard disk, and an SSD, or a recording medium such as an IC card, an SD card, and 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.

801: Information recording / reproducing apparatus 802: Control unit 803 ... Drive unit 810 ... External network 811 ... External memory 820 ... Optical information recording medium

Claims (14)

In an information recording / reproducing apparatus for an optical information recording medium,
A drive unit for performing data recording on an optical information recording medium;
A control unit for controlling the recording and reproduction of the drive unit,
The drive section
In the recording medium where the position of the recording unit is fixed in advance,
When recording data near the recorded unit,
If the time elapsed since the recording of the recorded recording unit is less than a predetermined time, recording in the recording unit area closest to the recorded recording unit;
If the time elapsed since the recording of the recorded recording unit is a predetermined time or more, the data is recorded in a recording unit at one or more positions away from the recorded recording unit. Recording / playback device. In an information recording / reproducing apparatus for an optical information recording medium,
A drive unit for performing data recording on an optical information recording medium;
A control unit for controlling the recording and reproduction of the drive unit,
The drive section
When recording near the recorded unit,
If the time elapsed since the recording of the recorded recording unit is less than a predetermined time, the position of the recording unit is determined to be a position at a first interval from the recorded recording unit;
If the time elapsed since the recording of the recorded recording unit is performed is a predetermined time or more, the position of the recording unit is determined to be a position at a second interval from the recorded recording unit. Information recording / reproducing apparatus. The information recording / reproducing apparatus according to claim 2,
An information recording / reproducing apparatus for recording the determined recording position at a predetermined position on a recording medium as position information of a recording unit. The information recording / reproducing apparatus according to claim 2,
The information recording / reproducing apparatus, wherein the second interval is wider than the first interval. The information recording / reproducing apparatus according to claim 3,
The information recording / reproducing apparatus, wherein the second interval is wider than the first interval. The information recording / reproducing apparatus according to claim 2,
The first interval is an interval in which adjacent hologram forming regions overlap each other;
The information recording / reproducing apparatus, wherein the second interval is an interval in which adjacent hologram forming regions do not overlap each other. The information recording / reproducing apparatus according to claim 3,
The first interval is an interval in which adjacent hologram forming regions overlap each other;
The information recording / reproducing apparatus, wherein the second interval is an interval in which adjacent hologram forming regions do not overlap each other. The information recording / reproducing apparatus according to claim 2,
If the recording medium is unrecorded,
An information recording / reproducing apparatus for recording from a predetermined position of a recording medium. The information recording / reproducing apparatus according to claim 2,
When there is a defect area near the recorded recording unit,
An information recording / reproducing apparatus for recording data at a recording unit recording position at a position spaced from the recording unit position so as to avoid a defective area. The information recording / reproducing apparatus according to claim 3,
The control unit
If the elapsed time from the time of recording of the recording unit is less than a predetermined time, the position of the recording unit is determined to be a position at a first interval from the recorded recording unit,
A recording mode in which the position of the recording unit is determined to be a position at a second interval from the recorded recording unit if the time elapsed since the recording of the recording unit was performed is a predetermined time or more;
Select a recording mode that determines the position of the recording unit regardless of the elapsed time since the recording of the recording unit was performed, and a position at a second interval from the position of the recorded recording unit,
An information recording / reproducing apparatus, wherein the drive unit performs recording according to a selected recording mode. In a method for recording on an optical information recording medium,
When recording near the recorded recording unit,
Determining the position of the recording unit at a first interval from the recorded recording unit if the time elapsed since the recording of the recorded recording unit is less than a predetermined time; and
A step of determining a position of the recording unit at a position spaced a second interval from the recorded recording unit if the time elapsed since the recording of the recorded recording unit is a predetermined time or more. Method. The recording method according to claim 11,
When the optical information recording medium is unrecorded,
A recording method comprising a step of recording from a predetermined position. The recording method according to claim 11,
When recording near the recorded unit,
Determining the presence or absence of a defective area;
A recording method comprising a step of determining a recording position of a recording unit at a position spaced from the recorded recording unit at an interval avoiding the defective area when there is a defective area. In an archive system that records data in holographic memory in response to a request from the host,
A drive for recording data in a holographic memory;
A controller for controlling the drive;
A memory for storing a table indicating addresses on the holographic memory;
Have
In the table, the position on the holographic memory of data that can be recorded in advance according to the recording unit is stored,
When performing recording in response to a data write request from the host, the controller places data from the host at a position different from the position on the holographic memory of data that can be recorded in advance according to the recording unit. When written, the written data and the position on the holographic memory are updated in the table.
Archive system.

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