JP2004134048A - Optical information recording device and optical information reproducing device, and recording medium storing computer-readable program usable for realizing the same - Google Patents

Abstract

An optical information recording apparatus and an optical information reproducing apparatus capable of performing appropriate recording and reproduction data processing efficiently when an error occurs during hologram recording, and a program for realizing such an apparatus. It is an object of the present invention to provide a recording medium in which the data is stored.
An optical information recording apparatus according to the present invention records information on an optical information recording medium using holography. Page data composed of two-dimensional pixel data is recorded at a predetermined position on an optical information recording medium as an interference pattern between an information light carrying page data information and a recording reference light. Is determined as normal, and the optical recording operation is controlled according to the result of the determination. When it is determined that the page data has not been recorded normally, the page data is recorded again at a position different from the predetermined position where the page data was first recorded. Identification information indicating re-recording is added to the re-recorded page data.
[Selection diagram] FIG.

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is directed to an optical information recording apparatus that records information on a recording medium using holography, an optical information reproducing apparatus that reproduces information from a recording medium using holography, and an optical information recording apparatus for reproducing these optical information or optical information. The present invention relates to a recording medium storing a program. More specifically, an optical information recording apparatus capable of appropriately performing processing of a data segment in which an error has occurred during hologram recording, and an optical information reproducing apparatus that reproduces information from an optical information recording medium on which data has been recorded by such processing And a recording medium storing a program for recording and reproducing optical information for such processing.
[0002]
[Prior art]
Holographic recording, in which information is recorded on a recording medium using holography, generally involves superimposing light having image information and reference light inside the recording medium, and generating interference fringes formed at that time on the recording medium. This is done by writing. When reproducing the recorded information, the recording medium is irradiated with reference light, whereby the image information is reproduced by diffraction due to interference fringes.
[0003]
In recent years, volume holography, especially digital volume holography, has been developed in the practical range for ultra-high-density optical recording, and has attracted attention. Volume holography is a method of writing interference fringes three-dimensionally by actively utilizing the thickness direction of the recording medium. Increasing the thickness increases the diffraction efficiency, and increasing the recording capacity by using multiplex recording. There is a feature that can be achieved. The digital volume holography is a computer-oriented holographic recording method that uses the same recording medium and recording method as the volume holography, but limits the image information to be recorded to a binary digital pattern. In this digital volume holography, for example, image information such as an analog picture is once digitized, developed into two-dimensional digital pattern information (also referred to as page data), and recorded as image information. At the time of reproduction, this digital pattern information is read out and decoded, thereby returning to the original image information and displaying it. Thereby, even if the SN ratio (signal-to-noise ratio) is somewhat poor at the time of reproduction, the original information can be reproduced very faithfully by performing differential detection or encoding the binary data and performing error correction. It becomes possible.
[0004]
By the way, in the hologram recording format, since the multiplex recording increases the data use efficiency of the recording medium, this format is suitable for high-density recording. However, all of one block of data to be recorded, that is, one block of data transferred from the host computer (one block of data is composed of a plurality of page data) are sequentially placed in one segment on the optical information recording medium. Since the holograms are not recorded as holograms but are distributed and arranged over a plurality of segments and are recorded, it is checked whether or not each data recorded after recording can be recorded without error (hereinafter, “Verify”). It takes a very long time. In order to solve this drawback, a method called a DRAW (Direct Read After Write) function of recording and verifying each hologram at the same time has already been proposed in Japanese Patent Application Laid-Open No. 11-311938 published on November 9, 1999. ing. The DRAW function is a function for reproducing recorded information immediately after recording the information, thereby enabling collation of the recorded information immediately after recording the information.
[0005]
Here, the principle of the DRAW function in holographic recording will be briefly described. When the interference pattern due to the interference between the recording reference light and the information light starts to be recorded on the hologram recording layer of the optical information recording medium, the recording reference light subsequently irradiated irradiates simultaneously from the position where the interference pattern was recorded. Light is generated. By detecting the reproduced light with a CCD array or a CMOS sensor, a Verify operation can be performed immediately after recording information.
[0006]
As a result of the verify operation, if it is determined that the error is within the recoverable range, the recording operation is continued, and if it is determined that the error is out of the recoverable range, the recording operation is stopped.
[0007]
[Patent Document 1]
JP-A-11-31938
[Problems to be solved by the invention]
However, when an error is detected by using the above-described DRAW function, it is suggested how to handle the information that actually caused the error and how to recover the error, and a specific method. Did not.
[0008]
The present invention has been made in view of such a problem, and an object of the present invention is to provide an optical information recording apparatus capable of multiplex-recording information on a recording medium by using holography, wherein an error occurs during hologram recording. It is an object of the present invention to provide an optical information recording device capable of performing appropriate recording data processing efficiently in such a case.
[0009]
Another object of the present invention is to provide an optical information reproducing apparatus for reproducing information from a recording medium on which information is multiplex-recorded by using holography, wherein the optical information recording medium is subjected to error processing at the time of recording and the information is recorded. An object of the present invention is to provide an optical information reproducing apparatus capable of efficiently and appropriately reproducing information.
[0010]
A further object of the present invention is to provide a recording medium for storing a program for realizing the above-described optical information recording and reproduction.
[0011]
[Means for Solving the Problems]
An optical information recording apparatus according to claim 1, wherein the optical information recording apparatus records information on an optical information recording medium by using holography, and stores page data composed of two-dimensional pixel data in a predetermined area of the optical information recording medium. An optical recording means for recording at a position as an interference pattern between an information light carrying page data information and a recording reference light; and a determination for judging whether the recording of the page data by the optical recording means has been performed normally. Means, and control means for controlling the recording operation of the optical recording means in accordance with the result of the judgment by the judgment means.
[0012]
Further, when it is determined by the determining means that the recording of the page data was not performed normally, the control means controls the optical recording means to re-record the page data at a position different from the predetermined position. Control.
[0013]
Further, the optical recording means is configured to record, along with the page data, identification information indicating that the page data to be recorded is a copy, under the control of the control means.
[0014]
The optical recording means records page identification information for identifying the page data together with the page data. The page identification information is an index number, and the index number is recorded so as to be decremented.
[0015]
The first and second index numbers may be used as the identification information. At this time, the first index number is added in a page unit so as to be decremented, and the second index number is added corresponding to the number of recordings.
[0016]
Further, the writing determining means checks whether or not the page data has been recorded normally by checking a reproduced image generated from the interference pattern recorded almost immediately after the recording of the page data.
[0017]
11. The optical information reproducing apparatus according to claim 10, wherein a plurality of page data are obtained by using holography and an interference pattern caused by interference between an information light carrying page data information composed of two-dimensional pixel data and a recording reference light. Is an optical information reproducing apparatus for reproducing information from an optical information recording medium provided with an information recording layer recorded according to a predetermined order, wherein a reproduction reference light is applied to the interference pattern to generate a reproduction light. Optical reproduction means, reproduction image acquisition means for detecting reproduction light to reproduce page data, determination means for determining whether or not the reproduced page data contains predetermined information; and Control means for replacing the previously reproduced page data with page data containing predetermined information when included in the reproduced page data. .
[0018]
Here, the predetermined information is information indicating that the current page data is the same as the page data recorded immediately before, and is included only in the current page data.
[0019]
Further, the predetermined information is an index number added to each page data, and when the determination result of the determination means is positive, the index number of the current page data and the index number of the immediately preceding page data are It is the same.
[0020]
Further, the index numbers are added so as to be decremented in a plurality of page data.
[0021]
Also, the predetermined information is a first index number added corresponding to each page data and a second index number added corresponding to the number of recordings, and the determining unit determines the first index and the second index number. The control means controls the page data replacement operation based on the presence or absence of the first index number, and performs the data read error correction operation based on the presence or absence of the second index number. You may make it control.
[0022]
The recording medium according to claim 16 is a recording medium storing a program for recording information on an optical information recording medium using holography, and stores page data composed of two-dimensional pixel data in the optical information recording medium. A first step of recording an interference pattern between an information light carrying page data information and a recording reference light at a predetermined position, and determining whether the page data has been normally recorded in the first step. A computer-readable program including a second step and a third step of controlling a recording operation of the optical recording means according to a result of the determination in the second step is recorded. .
[0023]
According to the recording medium of the present invention, a plurality of page data are determined by holography using an interference pattern caused by interference between an information light carrying page data information composed of two-dimensional pixel data and a recording reference light. A recording medium for storing a program for reproducing information from an optical information recording medium having an information recording layer recorded in accordance with the following order, and irradiating the interference pattern with reproduction reference light to generate reproduction light. A first step, a second step of reproducing the page data by detecting the reproduction light, a third step of determining whether or not the reproduced page data contains predetermined information, When information is included in the reproduced page data, a fourth step is to replace the previously reproduced page data with page data containing predetermined information. Tsu and up, with a, in which is described a computer readable program.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
(First embodiment)
FIG. 1 is an explanatory diagram showing a configuration of a pickup device (hereinafter, simply referred to as a pickup) in an optical information recording / reproducing apparatus according to the present embodiment and an optical information recording medium in the present embodiment, and FIG. FIG. 2 is a block diagram showing an overall configuration of an optical information recording / reproducing device according to an embodiment. Note that the optical information recording / reproducing device includes an optical information recording device and an optical information reproducing device. In the present embodiment, a disc-shaped optical disk is used as an optical information recording medium, but a card-shaped recording medium can be used.
[0025]
First, the configuration of the optical information recording medium according to the present embodiment will be described with reference to FIG. The optical information recording medium 1 has a hologram recording layer 3 as an information recording layer on which information is recorded by using volume holography, and a protective layer formed on one surface of a transparent disc-shaped substrate 2 made of polycarbonate or the like. A transparent substrate 4 having a function and a reflection film 5 are laminated in this order. The transparent substrate 4 is, for example, an address-added substrate created by injection. The substrate 4 is provided with a plurality of address servo areas 6 as a plurality of positioning areas extending linearly in the radial direction at predetermined angular intervals, and a fan-shaped section between adjacent address servo areas 6 is provided in the data area 7. Has become. The reflection film 5 is also formed on the address servo area 6. In the address servo area 6, information for performing focus servo and tracking servo by a sampled servo method and address information are recorded in advance by emboss pits or the like (preformat). Note that focus servo can be performed using the reflection surface of the reflection film 5. For example, wobble pits can be used as information for performing the tracking servo.
[0026]
In the present embodiment, as shown in FIG. 3A, for example, the thickness of the transparent substrate 2 is 0.5 to 0.4 mm, the hologram recording layer 3 is 0.2 to 0.3 mm, The thickness of the film layer 4 is 0.5 mm, and the total thickness of the optical information recording medium 1 is 1.2 mm. The thickness of the reflective film 5 is on the order of Å, and is negligible compared to the thickness of the entire recording medium. Further, in addition to the configuration of the optical information recording medium as shown in FIG. 3A, a hologram recording layer is provided on the transparent substrate 2 as shown in FIG. And the substrate 4 may be provided. Further, in FIG. 3A, the optical information recording medium may be configured such that the protective layer 4 is formed sufficiently thin by spin coating or the like, and a substrate with a reflective film 5 is laminated thereon. The following effect is obtained by adopting a configuration in which the reflection film 5 is directly disposed on the hologram recording layer 3 as shown in FIG. That is, in the present embodiment, the information light is focused on the reflection film 5 as described later. For this reason, the laser irradiation power per unit area in the hologram recording layer becomes higher. Therefore, when an interference pattern is generated on the hologram recording layer 3, the power of the laser light source 28 is set higher than that of the recording medium of FIG. Can also be reduced.
[0027]
In the present embodiment, also in the case of FIGS. 3A and 3B, the entire optical information recording medium has a thickness of 1.2 mm, which is the same as that of a CD or DVD. As a medium, compatibility with them can be maintained. Note that the hologram recording layer 3 is formed of a hologram material whose optical characteristics such as a refractive index, a dielectric constant, and a reflectance change according to the intensity of light when the light is irradiated. As the hologram material, for example, Photopolymers HRF-600 (product name) manufactured by Dupont is used. The reflection film 5 is made of, for example, aluminum.
[0028]
The format of the optical information recording medium (disk) of the present embodiment is as shown in FIG. 4, for example. That is, 45,000 tracks are provided on one side of the disk, and each track is composed of 98 frames. Each frame is composed of 14 segments, and each segment can record 6 to 14 holograms. The above address servo area 6 is provided only in the first segment “Segment # 0”.
[0029]
Next, the configuration of the optical information recording / reproducing apparatus according to the present embodiment will be described with reference to FIG. The optical information recording / reproducing apparatus 10 includes a spindle 81 on which the optical information recording medium 1 is mounted, a spindle motor 82 for rotating the spindle 81, and a spindle motor 82 for maintaining the rotation speed of the optical information recording medium 1 at a predetermined value. And a spindle servo circuit 83 for controlling the motor 82. The optical information recording / reproducing device 10 further irradiates the optical information recording medium 1 with information light and recording reference light to record information, and irradiates the optical information recording medium 1 with reproduction reference light. A pickup 11 for detecting reproduction light and reproducing information recorded on the optical information recording medium 1; and a driving device 84 for moving the pickup 11 in the radial direction of the optical information recording medium 1. It has.
[0030]
The optical information recording / reproducing device 10 further includes a detection circuit 85 for detecting the focus error signal FE, the tracking error signal TE, and the reproduction signal RF from the output signal of the pickup 11, and a focus error signal detected by the detection circuit 85. A focus servo circuit 86 that drives an actuator in the pickup 11 to move the objective lens in the thickness direction of the optical information recording medium 1 to perform focus servo based on the FE, and a tracking error signal TE detected by the detection circuit 85 A tracking servo circuit 87 that drives an actuator in the pickup 11 to move the objective lens in the radial direction of the optical information recording medium 1 to perform tracking servo based on the tracking error signal TE and a command from a controller described later. Drive The device 84 and are controlled and a slide servo circuit 88 for performing a slide servo for moving the pickup 11 in the radial direction of the optical information recording medium 1.
[0031]
The optical information recording / reproducing device 10 further decodes output data of a later-described CMOS sensor or CCD array in the pickup 11 to reproduce data recorded in the data area 7 of the optical information recording medium 1, A signal processing circuit 89 for reproducing a basic clock and determining an address from a reproduced signal RF from the controller 85, a controller 90 for controlling the entire optical information recording / reproducing apparatus 10, and various instructions to the controller 90 And an operating unit 91. The controller 90 receives the basic clock and address information output from the signal processing circuit 89 and controls the pickup 11, the spindle servo circuit 83, the slide servo circuit 88, and the like. The spindle servo circuit 83 receives the basic clock output from the signal processing circuit 89. The controller 90 has a CPU (central processing unit), a ROM (read only memory) and a RAM (random access memory), and the CPU executes a program stored in the ROM using the RAM as a work area. Thereby, the function of the controller 90 is realized.
[0032]
Next, the configuration of the pickup 11 in the present embodiment will be described with reference to FIG. When the optical information recording medium 1 is fixed to the spindle 81, the pickup 11 includes an objective lens 12 facing the transparent substrate 2 side of the optical information recording medium 1 and the objective lens 12 in a thickness direction of the optical information recording medium 1. And an actuator 13 movable in a radial direction, and a quarter-wave plate 14, a mirror 15, and a polarizing beam splitter 16 arranged in this order on the opposite side of the optical information recording medium 1 in the objective lens 12 from the objective lens 12 side. It has. Here, the quarter-wave plate receives linearly polarized light, such as P-polarized light or S-polarized light, and the direction of the linearly polarized light forms an angle with the optical axis of the crystal in the quarter-wave plate. At 45 degrees, the transmitted light is changed from linearly polarized light to circularly polarized light. Quarter-wave plates are used to convert linearly polarized light to circularly polarized light, or from circularly polarized light to linearly polarized light. In the case of this embodiment, the P-polarized light enters the quarter-wave plate to become circularly-polarized light, is reflected by the optical information recording medium 1, and the return light exits the quarter-wave plate again. Changes from circularly polarized light to S-polarized light.
[0033]
Further, the pickup 11 has a detecting means for detecting the reproduction light on the side (under the PBS 16) on which the return light (reproduction light) from the optical information recording medium 1 is reflected by the polarization splitting surface 16 a of the polarization beam splitter 16. A CCD or CMOS sensor 29 is provided, and a half mirror 17 is disposed in a direction (right side of the PBS) where the reference light or the information light enters the polarization splitting surface 16a. Further, in the incident direction of the reflected light from the half mirror 17 (below the half mirror 17), a convex lens 18 for defocus, mirrors 19 and 20, and a half-wave plate 21 constituting reference light generating means are arranged. ing. The half-wave plate is provided to make the polarization direction of the reference light the same as the polarization direction of the information light described later. This defocusing convex lens generates reference light that diverges parallel light to the objective lens 12 and enters the objective lens 12.
[0034]
In addition, the pickup 11 is provided with a polarization beam splitter 22 in the light incident direction of the half-wave plate 21 (to the right of the half-wave plate 21). Further, a spatial light modulator 23, a mirror 24, and an optical shutter 25 are provided in the incident direction of the transmitted light of the half mirror 17 (to the right of the half mirror 17). The spatial light modulator 23 has a large number of pixels arranged in a lattice pattern, and spatially modulates light by light intensity by selecting a light transmitting state and a light blocking state for each pixel, An information light carrying information can be generated. The spatial light modulator 23 constitutes an information light generating unit in the present invention. As the spatial light modulator, for example, a DMD or a liquid crystal element can be used.
[0035]
In the pickup 11, a half-wave plate 26 is further disposed on the light incident surface side (below the PBS 22) of the beam splitter 22, and a collimator lens 27 and a light source device 28 are sequentially arranged from the light incident surface side. Are located. Here, by changing the angle of the half-wave plate, the intensity ratio between the information light incident on the optical information recording medium 1 and the recording reference light can be appropriately set so as to be optimal. The light source device 28 emits coherent linearly polarized light, and for example, a semiconductor laser can be used.
[0036]
The pickup 11 irradiates the optical information recording medium with light from the side of the servo light source device 32, and returns the returned light to the objective lens 12, the dichroic mirror 30, the polarizing beam splitter (may be a half mirror) 31, and the convex lens 33. , And is incident on a four-divided photodetector 35 via a cylindrical lens 34. The focus error signal FE, the tracking error signal TE, and the reproduction signal RF are detected by the detection circuit 85 based on the output of the four-division photodetector 35.
[0037]
The spatial light modulator 23 and the light source devices 28 and 32 in the pickup 11 are controlled by the controller 90 in FIG.
[0038]
Further, in the pickup 11 according to the present invention, although not shown, a phase spatial modulator may be arranged between the convex lens 18 for defocusing and the mirror 19, or may be arranged at the same position as the mirror 19 or 20. Alternatively, a reflection-type phase spatial modulator may be arranged instead of the mirror. In this case, the phase spatial modulator has a large number of pixels arranged in a lattice pattern, and can selectively modulate the phase of light by selecting the phase of emitted light for each pixel. Has become. A liquid crystal element can be used as the phase spatial light modulator. Further, a micromirror device in which a micromirror moves in parallel with the output optical axis may be used. This phase spatial modulator is also controlled by the controller 90 in FIG. The controller 90 holds information on a plurality of modulation patterns for spatially modulating the phase of light in the phase spatial light modulator. Further, the operation unit 91 can select an arbitrary modulation pattern from a plurality of modulation patterns. The controller 90 provides the phase spatial light modulator with information on the modulation pattern selected by itself or the modulation pattern selected by the operation unit 91 in accordance with a predetermined condition. According to the information of the pattern, the phase of the light is spatially modulated by the corresponding modulation pattern.
[0039]
Further, in the pickup 11 according to the present invention, the optical path length from the polarizing beam splitter 22 to the mirror 24 via the spatial light modulator 23 to the half mirror 17, the mirror 20 and 19 from the beam splitter 22, and The optical system is set so that the optical path lengths through the convex lens 18 to the half mirror 17 are equal. By doing so, the optical path lengths of the recording reference light and the object light can be made equal. Further, there is an advantage that the contrast of interference fringes can be maximized even when the coherence distance of the laser as the hologram recording light source is short.
[0040]
Next, the operation of the optical information recording / reproducing apparatus according to the present embodiment will be described, including the operation of the DRAW function. Note that the optical information recording medium 1 is controlled by the spindle motor 82 to be controlled so as to maintain a specified number of rotations.
[0041]
The state of the pickup 11 during recording will be described with reference to FIG.
[0042]
The output of the light emitted from the light source device 28 is pulsed to a high output for recording. The controller 90 predicts the timing at which the light emitted from the objective lens 12 passes through the data area 7 based on the basic clock reproduced from the reproduction signal RF, and the light emitted from the objective lens 12 passes through the data area 7. During this time, the above settings are used. While the light emitted from the objective lens 12 passes through the data area 7, the focus servo and the tracking servo maintain the state at the time of passing through the servo area 7, so that the objective lens 12 is fixed. In the following description, it is assumed that the light source device 28 emits P-polarized light to the polarization beam splitter 22.
[0043]
In FIG. 1, the P-polarized light emitted from the light source device 28 is converted into a parallel light beam by a collimator lens 27, and the polarization direction is changed by a half-wave plate (for example, +22.5 degrees) 26. The polarization beam splitter 22 generates light having a P-polarized component and an S-polarized component. This light is incident on the beam splitter 22, a part of the light amount (P-polarized light component) passes through the polarization splitting surface 22a, and the remaining part (S-polarized light component) is reflected by the polarization splitting surface 22a. This reflected light (S-polarized light component) is incident on a half-wave plate (+45 degrees) 21. Here, the polarization direction of the S-polarized light is changed by 90 degrees to generate P-polarized light. This P-polarized light enters the convex lens 18 via the mirrors 19 and 20. The convex reference lens generates recording reference light that diverges in the objective lens 12 described below. The generated recording reference light is reflected by the half mirror 17.
[0044]
When a phase spatial light modulator is disposed between the convex lens 18 and the mirror 19, the phase spatial light modulator sets a predetermined phase for each pixel in accordance with a predetermined modulation pattern with respect to passing light. By selectively giving a phase difference of 0 (rad) or π (rad) or an intermediate phase difference with respect to the reference, the phase of light is spatially modulated, and the phase of light is spatially modulated. The generated recording reference light is generated. The controller 90 provides the phase spatial light modulator with information on the modulation pattern selected by itself or the modulation pattern selected by the operation unit 91 in accordance with a predetermined condition, and the phase spatial light modulator According to the information, the phase of the passing light is spatially modulated.
[0045]
On the other hand, the P-polarized light transmitted through the polarization splitting surface 22 a of the beam splitter 22 is reflected by the mirror 24 and enters the spatial light modulator 23 because the shutter 25 is open during recording. In the spatial light modulator 23, a reflection state (hereinafter, also referred to as ON) and a blocking state (hereinafter, also referred to as OFF) are selected for each pixel according to information to be recorded on the optical information recording medium 1. The information light is generated by spatially modulating the reflected light. In this embodiment, one pixel of information is represented by two pixels, and one of two pixels corresponding to one bit of information is always turned on and the other is turned off. Note that a DMD can be used as the spatial light modulator.
[0046]
The generated information light (P-polarized light) passes through the half mirror 17. Here, the P-polarized information light and the P-polarized recording reference light are integrated again (the optical axes are the same). Since these are both P-polarized lights, they both pass through the polarization beam splitter 16. Although the information light is parallel light, the recording reference light is changed into convergent light by the defocusing convex lens 18, so that it enters the polarization beam splitter 16 while converging. The information light and the recording reference light are both reflected by the mirror 15 and the traveling directions are changed.
[0047]
Thereafter, since the information light is a green laser of, for example, 532 nm as described above, it passes through the dichroic mirror 30 and is changed from P-polarized light to circularly-polarized light by a quarter-wave plate. The circularly polarized information light is emitted from the parallel light by the objective lens 12 so as to converge on the reflective layer 3 of the optical information recording medium 1.
[0048]
On the other hand, the recording reference light once converges between the mirror 15 and the quarter-wave plate 14, and thereafter enters the objective lens 12 as divergent light. Since this recording reference light is also, for example, a green laser, it passes through the dichroic mirror 30 and is polarized by the quarter-wave plate 14 from P-polarized light to circularly-polarized light. The circularly polarized recording reference light enters the objective lens 12 while diverging, and is thereby converted into light that focuses on the point F. That is, the recording reference light is defocused on the reflection film 5 of the optical information recording medium 1, and the light reflected by the reflection film is irradiated so as to converge at the focal point F ′ conjugate with the focal point F.
[0049]
The recording reference light and the information light irradiated on the optical information recording medium thus interfere with each other since the light has the same polarization direction, and an interference pattern is recorded in the hologram recording layer 3. This interference pattern constitutes a transmission hologram (also referred to as a horizontal fringe).
[0050]
Note that a spatial filter (not shown) is provided between the mirror 15 and the dichroic mirror 30, so that only the 0th and ± 1st order light of the information light passes therethrough, and unnecessary high order information light is cut off. . In the present embodiment, since the reference light is not modulated by the spatial light modulator, no light is cut by the spatial filter. However, when the phase of the light is modulated by the phase spatial light modulator to generate the reference light, high-order light is also generated in the reference light. Therefore, only the 0th-order and ± 1st-order reference lights are generated by the spatial filter. Pass through it, and the higher-order reference light is cut off.
[0051]
In the present embodiment, the DRAW function is realized by shifting the timing of stopping the irradiation of the recording reference light and the information light when terminating the recording operation of the page data forming one hologram. That is, when the irradiation of the recording reference light and the information light for a predetermined period sufficient for hologram generation is completed, the end of the irradiation of the information light is momentarily earlier than that of the irradiation of the recording reference light. Termination of the irradiation of only the information light is performed by closing the shutter 25 in FIG. Therefore, the shutter 25 may be closed slightly earlier than before the laser 28 is stopped.
[0052]
Until the laser 28 is stopped by closing the shutter 25, only the recording reference light is applied to the interference pattern just generated. As a result, a reproduction light corresponding to the information light at the time of recording is generated from the generated interference pattern. When generated, this reproduction light is circularly polarized light, but is converted into parallel light by the objective lens 12, and becomes S-polarized light when passing through the quarter-wave plate 14. This reproduction light passes through the dichroic mirror 30, is reflected by the mirror 15, and enters the polarization beam splitter 16. Since this reproduction light is S-polarized light, it is reflected by the polarization splitting surface 16a, and the reproduction image is detected by the CCD or CMOS sensor 29. Then, it is determined whether or not the detected reproduced image includes an error outside the correctable range (Verify operation).
[0053]
Next, a Verify operation and a process performed when an unrecoverable error occurs according to the present embodiment will be described with reference to the flowchart in FIG.
[0054]
When performing the recording operation, a WriteCommand is input as shown in step S101, and the recording operation is started. In step S102, the recording reference light and the information light are irradiated on the hologram recording layer 3 for a predetermined period to record page data, and an interference pattern is formed thereon. After the predetermined period, the recording operation is completed. However, as described above, first, only the information light is stopped, and only the recording reference light is irradiated for a certain period. By irradiating only the recording reference light, reproduction light is generated from the interference pattern just formed. In step S103, it is determined whether or not the reproduction light includes an unrecoverable error. If the detected error can be repaired, the process moves to step S104, and moves to the operation of recording page data to be recorded next. The next page data is not recorded continuously in the same segment as the previous page data, but is recorded discretely in the next segment. If the detected error can be repaired, the recording operation has succeeded, and therefore a CopyMark as described later is not added to the hologram constituting the next page data.
[0055]
If the detected error is unrecoverable in step S103, it means that recording of the current page data has failed, and the process proceeds to step S105. In step S105, a preparation process for recording the same page data again is performed. In other words, the pointer of the segment is incremented by one and the process moves to the next segment. Also, a CopyMark is added to the page data for which the recording has failed, and in step S102, processing is performed until the same page data is recorded in the next segment. The confirmation operation is performed again in step S103 as described above regarding whether or not the recording operation has been successful.
[0056]
In step S106, it is determined whether recording of a block of data (block data) constituting a plurality of page data sent from the host computer has been completed, and if not completed, steps S101 to S105 are performed. Is repeated. If it is determined that the recording has been completed, the recording operation ends.
[0057]
FIG. 6 shows hologram data (a) normally recorded and hologram data (b) to which CopyMark is added. As shown in FIG. 6B, in the hologram data, the upper leftmost sync code (code for positioning) has a characteristic. A sync code different from the hologram data of (a) represents CopyMark.
[0058]
Next, the concept of recording block data according to the present embodiment will be described using a specific example with reference to FIG. This diagram more specifically illustrates the concept of the process shown in the flowchart of FIG.
[0059]
In the example of FIG. 7, a block of data (block data) sent from the host computer is divided into four pages of original Data (1). First, the hologram data HoloData # 0 corresponding to the original Data # 0 is recorded in Seg # n which is the n-th segment ((2)). Then, the DRAW function is performed on the Holo Data # 0, and as a result of the Verify, an unrecoverable error is not detected ((3)), so that the operation shifts to the recording operation of the original Data # 1, which is the next page data. . The hologram data HoloData # 1 corresponding to the next original Data # 1 is recorded in Seg # n + 1 which is the (n + 1) th segment ((4)), and immediately after that, the Verify operation is performed. As a result, in this example, it is found that an uncorrectable error is included in the HoloData # 1 ((5)), and the HoloData # 1 corresponding to the original Data # 1 is again the Seg that is the (n + 2) th segment. # N + 2. That is, in the present embodiment, the same data is recorded in different segments. A copy mark indicating that this is the second recording is added to this HoloData # 1 ([6]). Then, the Verify operation is performed immediately after the recording of the data, and it is determined whether or not there is an unrecoverable error again. If there is no error, the process proceeds to the recording operation of the next original Data # 2 ([7]). ). If it is determined that there is an error that cannot be repaired again, this copying operation is repeated. Thereafter, recording and verifying operations are similarly performed for the original Data # 2 and Data # 3 ([8], [9]). Subsequently, the above processing is repeated for the next block data input from the post computer.
[0060]
As described above, in the present embodiment, when the recording operation is not performed properly, such as when the recorded hologram data includes an unrecoverable error, the same hologram data is stored in another position on the optical information recording medium. Although writing is performed again, information indicating that the data is a copy is included in the target hologram data. By doing so, it is possible to easily identify the data for which the recording has failed and the data for which the recording has succeeded, and the error recovery processing can be performed quickly.
[0061]
Next, with respect to the operation of reproducing data from the optical information recording medium, first, the operation of the pickup 11 at the time of reproduction will be described, and the reproduction operation of data including CopyMark will be described using a specific example.
[0062]
FIG. 8 is an explanatory diagram showing the state of the pickup 11 during reproduction. At the time of reproduction, a shutter 25 disposed between the mirror 24 and the polarization beam splitter 22 is turned on, and the incidence of light on the spatial light modulator 23 is cut. The light incident on the spatial light modulator 23 is blocked by the shutter 25 at the time of reproduction, but all pixels of the spatial light modulator 23 may be turned on just in case.
[0063]
The output of the light emitted from the light source device 28 is set to a low output for reproduction. The controller 90 predicts the timing at which the light emitted from the objective lens 12 passes through the data area 7 based on the basic clock reproduced from the reproduction signal RF, and the light emitted from the objective lens 12 passes through the data area 7. During this time, the above settings are used. In the following description, it is assumed that the light source device 28 emits P-polarized light to the beam splitter 22 at the time of reproduction as well as at the time of recording.
[0064]
As shown in FIG. 8, the P-polarized light emitted from the light source device 28 is converted into a parallel light beam by the collimator lens 27, and then the polarization direction is changed by the half-wave plate (+22.5 degrees) 26. Then, light having a P-wave component and an S-wave component is generated for the beam splitter 20. This light is incident on the beam splitter 20, and a part (P-polarized light) of the light amount passes through the polarization splitting surface 22a, and the remaining part (S-polarized light) is reflected by the polarization splitting surface 22a. The reflected light (S) is incident on the half-wave plate (+45 degrees) 21, where the polarization direction of the S-polarized light is changed by 90 degrees to generate P-polarized light. This P-polarized light enters the convex lens 18 via the mirrors 20 and 19. Reproduction reference light diverging in the objective lens 12 is generated by the convex lens 18. The generated reference light for reproduction is reflected by the half mirror 17 and enters the polarization beam splitter 16. This reproduction reference light is the same light as the recording reference light used at the time of recording. When a phase spatial modulator (not shown) is arranged between the convex lens 18 and the mirror 19 to generate the recording reference light, the controller 90 performs recording at the time of recording information to be reproduced. The information of the modulation pattern of the reference light for use is provided to the phase spatial light modulator. The phase spatial light modulator spatially modulates the phase of the passing light according to the information of the modulation pattern given from the controller 90, and generates the reproduction reference light in which the phase of the light is spatially modulated.
[0065]
The reproduction reference light that has entered the polarization beam splitter 16 is P-polarized light, passes through the polarization splitting surface 16a of the polarization beam splitter 16, is reflected by the mirror 15, and changes its traveling direction. The reproduction reference light is once converged between the mirror 15 and the quarter-wave plate, and thereafter enters the objective lens 12 as divergent light. Since this reproduction reference light is, for example, a green laser, it passes through the dichroic mirror 30 and is polarized by the quarter-wave plate 14 from P-polarized light to circularly-polarized light. The circularly polarized reference light for reproduction is incident on the objective lens 12 while diverging, whereby the light is focused on the point F. That is, the reproduction reference light is defocused on the reflection film 5 of the optical information recording medium 1, and the light reflected by the reflection film is irradiated so as to converge at the focal point F ′ conjugate with the focal point F.
[0066]
Although a spatial filter (not shown) is provided between the mirror 15 and the dichroic mirror 30, in the present embodiment, when the phase of the light is modulated by the phase spatial light modulator to generate the reproduction reference light, Since high-order light is also generated in the reference light, only the 0th-order and ± 1st-order reference lights pass through the spatial filter, and the high-order reference light is cut off.
[0067]
The reproduction light is generated by irradiation with the reproduction reference light. The generated reproduction light is converted into parallel light by the objective lens 12, and further converted from circularly polarized light to S-polarized light by the quarter-wave plate. This reproduction light passes through the dichroic mirror 30, is reflected by the mirror 15, and enters the polarization beam splitter 16. Since this reproduction light is S-polarized light, it is reflected by the polarization splitting surface 16a, and the reproduction image is detected by the CCD or CMOS sensor 29. The detected reproduced image is subjected to signal processing such as error correction and necessary decoding, and the data recorded on the optical information recording medium 1 is reproduced. This series of signal processing is performed by the signal processing circuit 89 in FIG.
[0068]
The data reading process during data reproduction will be described with reference to FIG. When a read command is input in step S201, a process of reading hologram data from the optical information recording medium 1 is started. First, in step S202, hologram data recorded in Seg # k, which is the k-th segment of the optical information recording medium 1, is read, reproduced, and stored in a buffer. Subsequently, in step S203, the data recorded in Seg # k + 1 which is the (k + 1) th segment is read, reproduced, and stored in the buffer. Further, in step S204, it is determined whether or not the reproduction data corresponding to the hologram data of Seg # k + 1 includes CopyMark. If it is determined that the data is not included, the process shifts to step S205 to output the restored data of Seg # k. Further, in step S206, it is determined whether or not the restored data is the last data of the block data sent from the host computer. If the restored data is the last data, the process ends. If the data to be read still remains, the process is continued. If it is determined in step S204 that CopyMark is included, the process proceeds to step S207. In this case, it is indicated that the hologram data of the previous segment Seg # k contains an error that cannot be normally restored, so that in step S207, the reproduction data of Seg # k is converted to Seg # k + 1 by Seg # k + 1. The replacement process is performed. Then, in step S208, preparations are made for reading the data of the next segment, and the hologram data of the segment number Seg # k + 2 is read (S203). When the reading of each page data included in the block data is completed in this manner, the process is also terminated.
[0069]
A specific example of the reproducing operation will be conceptually described with reference to FIG. First, hologram data HoloData # 0 is reproduced from segment Seg # n and stored in buffer # 0 ((1)). Subsequently, the hologram data HoloData # 1 is reproduced from the segment Segn + 1 and stored in the buffer # 1 ((2)). Since the copy mark is not included in the holo data # 1, the holo data # 0 stored in the buffer # 0 is restored and output ([3]). Next, the hologram data HoloData # 2 is reproduced from the segment number Seg # n + 2 and stored in the buffer # 2 ([4]). Since the copy mark is included in the holo data # 2, the holo data # 1 already stored in the buffer # 1 is replaced with the holo data # 1 (copy) stored in the buffer # 2 ([5]). This is because reading of the hologram data from Seg # n + 2 has revealed that HoloData # 1 is not restored to normal data. Thereafter, the hologram data HoloData # 2 is reproduced from the segment number Seg # n + 3 and stored in the buffer # 2 ([6]). This is because the buffer # 2 is empty at this point. This is because Holo Data # 2 has been written to buffer # 1. Since the copy mark is not included in the holo data # 2, the restored data corresponding to the holo data # 2 is output at this time ((7)). Further, data is reproduced from the segment numbers Seg # n + 4 and n + 5, and the above processing is repeated ([8], [9]). Finally, the restoration data is joined to restore one block data.
[0070]
As described above, even if data including an error that cannot be restored to normal data is recorded on the optical information recording medium 1, the data restoration process can be performed accurately and promptly.
(Second embodiment)
The configurations of the optical information recording / reproducing device and the optical pickup according to the second embodiment are the same as those of the first embodiment, and thus the description is omitted. The second embodiment is different from the first embodiment in that data writing and reading processes are performed using Index labels.
[0071]
FIG. 11 is a flowchart of a data recording operation according to the second embodiment.
[0072]
When performing a recording operation, a WriteCommand is input as shown in step S301, and the recording operation is started. In step S302, an index is added to all of the page data to be recorded (also referred to as "HoloData"; note that "HoloData" is used instead of "page data" in FIG. 11). Then, in step S303, the recording reference light and the information light are applied to the hologram recording layer 3 for a predetermined period to record page data, and an interference pattern is formed thereon. After the predetermined period, the recording operation is completed. However, as described above, first, only the information light is stopped, and only the recording reference light is irradiated for a certain period. By irradiating only the recording reference light, reproduction light is generated from the interference pattern just formed. In step S304, it is determined by the DRAW function whether or not the reproduction light includes an unrecoverable error. If the detected error can be repaired, the process moves to step S305, and moves to the operation of recording page data to be recorded next. The next page data is not recorded continuously in the same segment as the previous page data, but is recorded discretely in the next segment. If the detected error can be repaired, the recording operation has succeeded, and the Index added to the page data is recorded only once.
[0073]
If the detected error is unrecoverable in step S304, it means that recording of the current page data has failed, and the process proceeds to step S306. In step S306, a preparation process for recording the same page data again is performed. In other words, the pointer of the segment is incremented by one and the process moves to the next segment. Further, in step S303, the same page data is processed to be recorded in the next segment. As to whether or not the recording operation has been successful, the confirmation operation is performed again as described above in step S304.
[0074]
In step S307, it is determined whether recording of a block of data (block data) constituting a plurality of page data sent from the host computer has been completed, and if not completed, steps S301 to S306 are performed. Is repeated. If it is determined that the recording has been completed, the recording operation ends.
[0075]
Next, the concept of recording block data according to the present embodiment will be described using a specific example with reference to FIG. This diagram more specifically illustrates the concept of the process shown in the flowchart of FIG.
[0076]
In the example of FIG. 12, a block of data (block data) sent from the host computer is divided into original data for X pages ((1)). Indexes # X-1 to # 0 are added to the respective page data (HoloData # 0 to X-1) corresponding to the generated original data. Then, the hologram data HoloData # 0 corresponding to the original Data # 0 is recorded together with the Index # X-1 in Seg # n which is the n-th segment ([2]). Next, the DRAW function was performed on the Holo Data # 0, and as a result of the Verify, an unrecoverable error was not detected ((3)), and the operation shifts to the recording operation of the original Data # 1, which is the next page data. I do. Hologram data HoloData # 1 corresponding to the next original Data # 1 is recorded together with Index # X-2 in Seg # n + 1 which is the (n + 1) th segment ([4]), and the Verify operation is performed immediately thereafter. As a result, in this example, it has been found that an error that cannot be corrected is included in HoloData # 1 ((5)), and Solo # in which HoloData # 1 corresponding to original Data # 1 is the (n + 2) th segment. The data is recorded again in n + 2 together with Index # X-2 ([6]). That is, in the present embodiment, when an unrecoverable error occurs during recording, the same data and the same Index are recorded in different segments. Then, the Verify operation is performed immediately after the recording of the data, and it is determined whether or not there is an unrecoverable error again. If there is no error, the process proceeds to the recording operation of the next original Data # 2 ([7]). ). If it is determined that there is an error that cannot be repaired again, this copying operation is repeated. Thereafter, recording and verifying operations are similarly performed for the original Data # 2 and Data # 3 ((8)). Subsequently, the above processing is repeated for the next block data input from the post computer.
[0077]
As described above, in the present embodiment, when the recording operation is not performed properly, such as when the recorded hologram data includes an unrecoverable error, the same hologram data is stored in another position on the optical information recording medium. Although writing is performed again, a recording operation is performed so that it can be easily determined at the time of reproduction that the target hologram data is a copy. By doing so, it is possible to easily identify the data for which the recording has failed and the data for which the recording has succeeded, and the error recovery processing can be performed quickly.
[0078]
With reference to FIG. 13, a data reading process during data reproduction will be described. When a read command is input in step S401, a process of reading hologram data from the optical information recording medium 1 is started. First, in step S402, hologram data recorded in Seg # k, which is the k-th segment of the optical information recording medium 1, is read, reproduced, and stored in a buffer. Subsequently, in step S403, the data recorded in Seg # k + 1 which is the (k + 1) th segment is read, reproduced, and stored in the buffer. Further, in step S404, the Index of Seg # k and the Index of Seg # k + 1 are compared to determine whether or not they are the same Index. If it is determined that they are not the same, the process shifts to step S405 to output the restored data of Seg # k. Further, in step S406, it is determined whether or not the restored data is the last data of the block data sent from the host computer. If the restored data is the last data, the process ends. If the data to be read still remains, the process is continued. If it is determined in step S404 that the Indexes are the same, the process proceeds to step S407. In this case, it is indicated that the hologram data of the previous segment Seg # k contains an error that cannot be normally restored, and thus, in step S407, the reproduction data of Seg # k is converted to Seg # k + 1 by Seg # k + 1. The replacement process is performed. Then, in step S408, preparations are made for reading the data of the next segment, and the hologram data of the segment number Seg # k + 2 is read (S403). When the reading of each page data included in the block data is completed in this way, the process is also terminated.
[0079]
A specific example of the reproducing operation will be conceptually described with reference to FIG. First, hologram data HoloData # 0 is reproduced from segment Seg # n and stored in buffer # 0 ((1)). Subsequently, the hologram data HoloData # 1 is reproduced from the segment Segn + 1 and stored in the buffer # 1 ((2)). Since the index of HoloData # 0 and HoloData # 1 is different between # X-1 and # X-2, HoloData # 0 stored in buffer # 0 is restored and output ([3]). Next, hologram data is reproduced from the segment number Seg # n + 2 and stored in the buffer # 2 ([4]). Since the index of the hologram data is # X-2, which is the same as the index of Holo Data # 1, the Hol Data # 1 already stored in the buffer # 1 is replaced with the Hol Data # 1 (copy) stored in the buffer # 2. (5). This is because it has been found by reading the hologram data of Seg # n + 2 that HoloData # 1 is not restored to normal data. Then, the restored data corresponding to the HoloData # 1 is output ([6]). Thereafter, the hologram data HoloData # 2 is reproduced from the segment number Seg # n + 3 and stored in the buffer # 2 ([7]). Since the index of the hologram data stored in the buffer # 2 is different from the index of the hologram data stored in the buffer # 1, the restored data corresponding to HoloData # 2 is output at this point ((8)). Further, data is reproduced from the segment numbers Seg # n + 4 and n + 5, and the above processing is repeated ([9], (10)). Finally, the restoration data is joined to restore one block data.
[0080]
Thus, in the second embodiment, the Index number is decremented by one. Data is read in order from the first segment, and if there is data that has not been decremented, the hologram data having the same Index number read earlier is discarded. This idea is basically the same as in the first embodiment using CopyMark.
[0081]
In addition, when this method is adopted, at the time of reading, by reading out the first hologram data, it is possible to predict the number of subsequent data blocks, that is, the number of pages (the number of holo data) from the index number included therein. Therefore, it is possible to secure memory in advance on the device side, which is convenient for handling data.
[0082]
Further, since the index numbers are added to all the data, skipping of the data can be prevented.
[0083]
As described above, even if data including an error that cannot be restored to normal data is recorded on the optical information recording medium 1, the data restoration process can be performed accurately and promptly.
[0084]
Next, with reference to FIG. 15, a description will be given of a countermeasure when an error occurs during Read.
[0085]
Even if DRAW can be read normally due to dust or fingerprints on the surface of the medium, scratches or deformation of the medium, it cannot be said that an error will not occur in the subsequent READ. In order to explain a coping method when such an error occurs, the following case is assumed.
[0086]
It is assumed that data reading is started from Seg # n at the time of READ, and the READ result as shown in FIG. In this case, it is clear that an error occurs during recording with Seg # n + 1, and recording (Retry) is performed again with Seg # n + 2. This is because the Index numbers recorded in these two segments are the same. However, looking at the arrangement of the Index numbers, when picking up only those locations that succeeded in READ, they were arranged in the order of X-1 → X-2 → X-3 → X-4. Not. That is, in this case, the data of Seg # n + 1 determined to have caused an error in the DRAW function is mistaken for normal data.
[0087]
In order to avoid such a problem, the above-mentioned problem is solved by introducing a cyclic index that simply increments or decrements the counter for each write operation independently of Retry, in addition to the index that is further decremented. Can be solved. That is, the hologram recording may be performed as described above, including the two types of identification information of the index number to be decremented and the cyclic index number in each page data included in the data block.
[0088]
In order to explain this solution, it is assumed that when data reading is started again from the start segment, a READ result as shown in FIG.
[0089]
In this case, as shown in FIG. 15 (a), when the result of READ based on only the Index number is determined, the data following Seg # n + 1 to Seg # n + 3 is changed from X-2 to X-3. Because of the transition, it is determined that the data is normal data, and no mistake can be noticed. However, at this time, if the CIndex is monitored at the same time, since the CIndex jumps from 1 to 3, an abnormal change can be detected. In this way, the abnormal situation may be detected, and the error may be appropriately corrected. By providing the CIndex separately from the Index, errors occurring during recording can be processed using the Index, and errors occurring during the Read can be processed separately using the CIndex. Can be realized.
[0090]
In the opposite case, the read of Seg # n + 1 fails, and the read of Seg # n + 2 succeeds. In the case where the state should be as expected, the READ result as shown in FIG. 15C is obtained. In this case, at the time of transition from Seg # n + 2 to Seg # n + 3, the Index number normally transitions from X-2 to X-3, and the CIndex number is also normally incremented from 2 to 3, causing a problem. Has not occurred.
[0091]
Note that the cyclic index only cyclically increments or decrements the data, and there is no special restriction. Even if the data is rotated from 0 to 4 as in this example, it is not changed from 0 to 100. Even if it is turned, it is only necessary that the data be continuous.
[0092]
As described above, the configuration and operation of the present invention have been described based on the principle and the embodiment. However, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the gist of the invention. is there.
[0093]
Note that the series of processes in the first and second embodiments can be executed by hardware, but can also be executed by software. When a series of processing is executed by software, a program constituting the software may be executed by a computer built into dedicated hardware or by installing various programs to execute various functions. It is installed from a program storage medium to a possible general-purpose personal computer or the like.
[0094]
In this specification, the step of describing a program recorded on a recording medium may be performed in a chronological order according to the described order. Alternatively, the processing includes individually executed processing.
[0095]
【The invention's effect】
According to the optical information recording apparatus of the first aspect, an optical information recording apparatus that records information on an optical information recording medium using holography, wherein page data composed of two-dimensional pixel data is stored in the optical information recording medium. An optical recording means for recording an interference pattern between an information light carrying page data information and a recording reference light at a predetermined position, and determining whether page data has been normally recorded by the optical recording means A determination unit and a control unit that controls a recording operation of the optical recording unit according to a determination result of the determination unit. Therefore, even if page data that has been recorded is not normally recorded, appropriate processing can be performed. To record the data.
[0096]
According to the optical information recording apparatus of the present invention, when the judgment means judges that the recording of the page data was not performed normally, the control means separates from the predetermined position where the page data was first recorded. The optical recording means is controlled so as to re-record at the position, so that the interference pattern (hologram) that generates a reproduced image including an uncorrectable error is not left as it is, but only the error within the correctable range is included. The hologram can be recorded normally.
[0097]
According to the optical information recording apparatus of the present invention, the optical recording means records the identification information indicating that the page data to be recorded is a copy together with the page data under the control of the control means. Therefore, holograms containing errors that cannot be corrected at the time of reproduction can be quickly and appropriately processed.
[0098]
According to the optical information recording apparatus of the fourth aspect, the optical recording means records page identification information for identifying the page data together with the page data, so that a hologram including an error that cannot be corrected at the time of reproduction. Thus, it is easy to distinguish a reproduced image from a reproduced image from a hologram that can be normally reproduced, and a hologram including an uncorrectable error can be reproduced quickly and appropriately.
[0099]
According to the optical information recording apparatus of the fifth aspect, the page identification information is an index number, and when the result of the determination means is negative, the page identification information is replaced with the index number of the page data that could not be recorded normally. Since the index numbers of the recorded page data are the same, the sequence of a plurality of holograms to be recorded can be easily grasped, and the processing at the time of reproducing the hologram including an error that cannot be corrected from the sequence can be performed quickly and appropriately. It can be carried out.
[0100]
According to the optical information recording apparatus of the present invention, since the index number is recorded so as to be decremented, the number of page data in the data block can be grasped, and at the time of recording, the number of the currently recorded hologram is determined. Page data, and it is easy to determine how many hologram data to read at the time of reproduction.
[0101]
According to the optical information recording apparatus of the present invention, since the first and second index numbers are used as the identification information, the two index numbers can be used for different purposes, respectively. Can be appropriately performed.
[0102]
Furthermore, according to the optical information device of the eighth aspect, the first index number is added in page units so as to be decremented, and the second index number is added according to the number of recordings. The first index number corresponds to the reproduction processing of a hologram including an error that cannot be corrected, and the second index number corresponds to the processing of a reading error generated due to a scratch or the like on the surface of the recording medium. That is, it is possible to cope with both a writing error and a reading error during reproduction.
[0103]
According to the optical information recording apparatus of the ninth aspect, the judging means checks the reproduced image generated from the interference pattern recorded almost immediately after the recording of the page data, so that the recording of the page data is normal. Is performed, it is possible to quickly check whether or not the recorded hologram data contains an uncorrectable error.
[0104]
According to the optical information reproducing apparatus of the tenth aspect, by using holography, a plurality of interference patterns due to interference between an information light carrying page data information composed of two-dimensional pixel data and a recording reference light, An optical information reproducing apparatus for reproducing information from an optical information recording medium provided with an information recording layer in which page data is recorded in a predetermined order, and irradiates an interference pattern (hologram) with a reproduction reference light to reproduce the information. Optical reproduction means for generating light, reproduction image acquisition means for detecting reproduction light to reproduce page data, and determination means for determining whether or not predetermined information is included in the reproduced page data, When predetermined information is included in the reproduced page data, a system is configured to replace the page data reproduced immediately before with page data including the predetermined information. Because comprising means, and to distinguish the reproduced image corresponding to the page data on the presence or absence of predetermined information, can be processed reproduction processing promptly and properly.
[0105]
According to the optical information reproducing apparatus of the eleventh aspect, the predetermined information is information indicating that the current page data is the same as the page data recorded immediately before. Can be appropriately performed.
[0106]
According to the optical information reproducing apparatus of the twelfth aspect, since the predetermined information is included only in the current page data, a reproduced image of the page data including an uncorrectable error can be easily found and normally recorded. Page data can be reproduced.
[0107]
According to the optical information reproducing apparatus of the thirteenth aspect, the predetermined information is an index number added to each page data, and when the determination result of the determination means is affirmative, the current page is determined. Since the index number of the data is the same as the index number of the immediately preceding page data, it is easy to find a reproduced image of the page data including an uncorrectable error and to reproduce the page data that can be recorded normally. Can be.
[0108]
According to the optical information reproducing apparatus of the present invention, since the index number is added so as to be decremented in a plurality of page data, the number of page data in the data block can be grasped. Hologram data can be easily determined.
[0109]
Furthermore, according to the optical information reproducing apparatus of the present invention, the predetermined information is a first index number added corresponding to each page data and a second index number added corresponding to the number of recordings. The determination means determines the presence or absence of the first index and the second index number, and the control means controls the operation of replacing the page data based on the presence or absence of the first index number. Since the data reading error correction operation is controlled based on the presence or absence of the index number, it is possible to cope with both writing errors and reading errors.
[0110]
According to the recording medium of the present invention, there is provided a program for recording information on an optical information recording medium using holography, wherein page data composed of two-dimensional pixel data is stored at a predetermined position on the optical information recording medium. A first step of recording as an interference pattern between an information light carrying page data information and a recording reference light, and a second step of determining whether the page data has been normally recorded in the first step. And a third step of controlling a recording operation of the optical recording means in accordance with a result of the determination in the second step. Therefore, it is possible to provide a program for realizing an optical information recording apparatus that can cope with a case where page data cannot be recorded normally.
[0111]
According to the recording medium of the present invention, a plurality of page data can be obtained by using holography and an interference pattern caused by interference between an information light carrying page data information composed of two-dimensional pixel data and a recording reference light. Is a program for reproducing information from an optical information recording medium having an information recording layer recorded according to a predetermined order, wherein a reproduction reference light is applied to the interference pattern to generate a reproduction light. Step, a second step of detecting the reproduction light to reproduce the page data, a third step of determining whether or not the reproduced page data contains predetermined information, and reproducing the predetermined information. A fourth step of replacing the previously reproduced page data with page data containing predetermined information when the page data is included in the reproduced page data. A computer-readable program is described, which realizes an optical information reproducing apparatus that performs appropriate processing on a reproduced image of page data (hologram) containing an uncorrectable error. Program can be provided.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a pickup and an optical information recording medium in an optical information recording / reproducing apparatus according to an embodiment of the present invention.
FIG. 2 is a block diagram showing an overall configuration of an optical information recording / reproducing apparatus according to an embodiment of the present invention.
FIG. 3 is a diagram showing a structure of a hologram recording medium used in the optical information recording / reproducing apparatus according to the present invention.
FIG. 4 is a diagram showing a data configuration recorded on a hologram recording medium.
FIG. 5 is a flowchart for explaining a recording operation of the optical information recording / reproducing apparatus according to the first embodiment of the present invention.
FIG. 6 is a diagram showing normal page data and page data including a copy mark.
FIG. 7 is a diagram showing a specific state of recording by the optical information recording / reproducing apparatus according to the first embodiment of the present invention.
FIG. 8 is a diagram for explaining the operation of the pickup during reproduction.
FIG. 9 is a flowchart for explaining a reproducing operation of the optical information recording / reproducing apparatus according to the first embodiment of the present invention.
FIG. 10 is a diagram showing a specific state of reproduction by the optical information recording / reproducing apparatus according to the first embodiment of the present invention.
FIG. 11 is a flowchart for explaining a recording operation of the optical information recording / reproducing apparatus according to the second embodiment of the present invention.
FIG. 12 is a diagram showing a specific state of recording by the optical information recording / reproducing apparatus according to the second embodiment of the present invention.
FIG. 13 is a flowchart for explaining a reproducing operation of the optical information recording / reproducing apparatus according to the second embodiment of the present invention.
FIG. 14 is a diagram showing a specific state of reproduction by the optical information recording / reproducing apparatus according to the second embodiment of the present invention.
FIG. 15 is a diagram showing a specific state of reproduction when a cyclic index is introduced.
[Explanation of symbols]
1 Information recording medium
10 Optical information recording / reproducing device
11 Optical pickup
23 spatial light modulator
28 Light source device (laser)
29 CCD array or CMOS sensor
89 signal processing circuit
90 Controller
91 Drive

Claims (17)

An optical information recording device that records information on an optical information recording medium using holography,
Optical recording means for recording page data composed of two-dimensional pixel data at a predetermined position of the optical information recording medium as an interference pattern between an information light carrying the information of the page data and a recording reference light;
Determining means for determining whether the recording of the page data by the optical recording means was performed normally;
Control means for controlling a recording operation of the optical recording means according to a result of the determination by the determination means;
An optical information recording device, comprising: When the determination unit determines that the recording of the page data was not performed normally, the control unit controls the optical recording unit to re-record the page data at a position different from the predetermined position. 2. The optical information recording apparatus according to claim 1, wherein 3. The optical information recording apparatus according to claim 2, wherein the optical recording unit records, along with the page data, identification information indicating that the page data to be recorded is a copy, under the control of the control unit. apparatus. 3. The optical information recording apparatus according to claim 2, wherein the optical recording means records page identification information for identifying the page data together with the page data. The page identification information is an index number, and if the result of the determination is negative, the index number of the page data that could not be normally recorded and the index number of the re-recorded page data are the same. The optical information recording apparatus according to claim 4, wherein: 6. The optical information recording apparatus according to claim 5, wherein the index number is recorded so as to be decremented. The optical information recording device according to claim 4, wherein first and second index numbers are used as the identification information. 8. The optical information recording apparatus according to claim 7, wherein the first index number is added in units of a page so as to be decremented, and the second index number is added in accordance with the number of times of recording. The determination unit determines whether the recording of the page data is normally performed by checking a reproduced image generated from an interference pattern recorded almost immediately after the recording of the page data. The optical information recording device according to claim 1. An information recording layer in which a plurality of page data are recorded in a predetermined order by an interference pattern caused by interference between an information light carrying page data information composed of two-dimensional pixel data and a recording reference light using holography; An optical information reproducing apparatus for reproducing information from an optical information recording medium comprising:
Optical reproducing means for generating reproduction light by irradiating the interference reference pattern with reproduction reference light,
A reproduction image acquisition unit that detects the reproduction light and reproduces the page data;
Determining means for determining whether or not predetermined information is included in the reproduced page data;
When the predetermined information is included in the reproduced page data, control means for replacing the immediately reproduced page data with page data including the predetermined information,
An optical information reproducing apparatus comprising: 11. The optical information reproducing apparatus according to claim 10, wherein the predetermined information is information indicating that the current page data is the same as the page data recorded immediately before. The optical information reproducing apparatus according to claim 11, wherein the predetermined information is included only in the current page data. The predetermined information is an index number added to each page data, and when the determination result of the determination means is positive, the index number of the current page data and the index number of the immediately preceding page data are The optical information reproducing apparatus according to claim 11, wherein the optical information reproducing apparatus is the same. 14. The optical information reproducing apparatus according to claim 13, wherein the index number is added so as to be decremented in the plurality of page data. The predetermined information is a first index number added corresponding to each page data and a second index number added corresponding to the number of recordings,
The determining means determines whether there is a first index and a second index number,
The control means controls the page data replacement operation based on the presence or absence of the first index number, and controls the data read error correction operation based on the presence or absence of a second index number. Item 12. An optical information reproducing apparatus according to Item 11. A program for recording information on an optical information recording medium using holography,
A first step of recording page data composed of two-dimensional pixel data at a predetermined position of the optical information recording medium as an interference pattern between an information light carrying the information of the page data and a recording reference light;
A second step of determining whether the recording of the page data in the first step has been normally performed;
A third step of controlling a recording operation of the optical recording means according to a result of the determination in the second step; a recording medium in which a computer-readable program is recorded. An information recording layer in which a plurality of page data are recorded in a predetermined order by an interference pattern caused by interference between an information light carrying page data information composed of two-dimensional pixel data and a recording reference light using holography A program for reproducing information from an optical information recording medium comprising:
A first step of generating reproduction light by irradiating the interference reference pattern with reproduction reference light;
A second step of detecting the reproduction light and reproducing the page data;
A third step of determining whether or not predetermined information is included in the reproduced page data;
A fourth step in which, when the predetermined information is included in the reproduced page data, replacing the page data reproduced immediately before with the page data including the predetermined information;
A recording medium on which a computer-readable program is described.

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