JP2015146221A - Optical information reproducing apparatus and optical information reproducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical information reproducing apparatus capable of compensating for a defect in a reproduced image resulting from an optical system such as an optical detector and a lens, and ensuring high reliability.SOLUTION: A plurality of images relating to image signal data acquired by an optical detector 325 of an optical information reproducing apparatus are synthesized to compensate for a defect in a reproduced image resulting from an optical system. A position of a defect in the optical system is stored in advance (103). If decoded data of the read image signal data is defective, optical components such as a lens are moved on the basis of positional information on the stored defect so as to move a position of light incident on the optical detector (104). Image signal data corresponding to a plurality of images acquired before and after the movement of the optical components is synthesized to compensate for the defect in the reproduced image (105).

Description

  The present invention relates to an optical information reproducing apparatus and an optical information reproducing method for reproducing information from an optical information recording medium using holography.

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

  However, in order to realize such an ultra-high density with an optical disc, a high-density technology by a new method is required, which is different from the high-density technology by shortening the wavelength and increasing the NA of the objective lens. While research on next-generation storage technology is underway, hologram recording technology that records digital information using holography is attracting attention.

  Patent Document 1 discloses that “a reference light irradiation unit that irradiates a hologram recording medium with reference light, a spatial modulation unit that generates information light modulated using spatial information corresponding to page data to be written on the medium, and reference light An information light irradiating unit for irradiating information light to the same region as the region to be irradiated, a light detecting unit for receiving reproduction light generated by irradiating the medium with reference light, and a known prestored page data A defect in which the known page data is written on the medium using the data storage unit and the spatial information corresponding to the known page data, and then the known page data written on the medium is read to investigate the defect position of the light detection unit, etc. It is characterized in that it includes an investigation unit and a reproduction control unit that restores and reproduces the data of the defect position included in the reproduction light by using information on the detected defect position.

JP 2006-236536 A

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

  At the time of reproducing information, if the recording medium is irradiated with the reference light used at the time of recording, the hologram recorded in the recording medium acts like a diffraction grating to generate diffracted light. This diffracted light is reproduced as the same light including the recorded signal light and phase information.

  The reproduced signal light is detected two-dimensionally at high speed using a photodetector such as a CMOS or CCD. As described above, the hologram recording technique enables two-dimensional information to be recorded on the optical recording medium at once by one hologram and further reproduces this information. Since the page data can be overwritten, large-capacity and high-speed information recording / reproduction can be achieved.

  By the way, when the defect of the reproduction | regeneration image resulting from the defect of a photon detection part or an optical component is the range which cannot be accept | permitted, the subject that the data recorded on the optical information recording medium cannot be decoded occurred.

  However, in Patent Document 1, information on a defective portion is restored by performing error correction based on detected defect position information. However, data recorded when a defect in a reproduced image exceeds the range of error correction capability. Does not take into account that it becomes impossible to decrypt. Further, in Patent Document 1, the defect portion is avoided by rearranging and recording the page data based on the detected defect position information. However, the defect portion generated after recording cannot be avoided, and the defect portion Depending on the size, it cannot be avoided by rearranging the page data.

  Therefore, an object of the present invention is to provide a highly reliable optical information reproducing apparatus capable of reproducing recorded information even when a defect occurs in a reproduced image due to defects in a light detection unit and optical components. is there.

  The above-described problems are solved by, for example, the invention described in the claims.

  According to the present invention, there is provided a highly reliable optical information reproducing apparatus capable of reproducing recorded information even when a defect occurs in a reproduced image due to a defect occurring in an optical component related to a light detection unit and reproduction. Can be provided.

The block diagram which shows the optical information recording / reproducing apparatus in one Example. 1 is a first schematic diagram showing a configuration of a pickup of an optical information recording / reproducing apparatus in an embodiment. FIG. The 2nd schematic diagram which shows the structure of the pick-up of the optical information recording / reproducing apparatus in one Example. The 1st operation | movement flowchart of the optical information recording / reproducing apparatus in one Example. The 2nd operation | movement flowchart of the optical information recording / reproducing apparatus in one Example. The 3rd operation | movement flowchart of the optical information recording / reproducing apparatus in one Example. The 1st operation | movement flowchart of the signal generation circuit and signal processing circuit in one Example. The 2nd operation | movement flowchart of the signal generation circuit and signal processing circuit in one Example. The block diagram which shows the signal generation circuit of the optical information recording / reproducing apparatus in one Example. The block diagram which shows the signal processing circuit of the optical information recording / reproducing apparatus in one Example. The conceptual diagram which shows the defect detection of the photodetector in one Example. The conceptual diagram which shows the photodetector defect position in one Example. The figure which concerns on the defect compensation of the optical information recording / reproducing apparatus in one Example. The operation | movement flowchart of the signal processing circuit at the time of defect compensation in one Example. The block diagram which shows the defect compensation circuit in one Example. The conceptual diagram which concerns on the defect position of the photodetector in one Example. The 1st schematic diagram of the pickup which shows the position movement of reproduction light in one example. The 2nd schematic of the pickup which shows the position movement of the reproduction | regeneration light in one Example. The 3rd schematic diagram of the pickup which shows the position shift of reproduction light in one example. The 4th schematic diagram of the pickup which shows the position movement of reproduction light in one example. The conceptual diagram which shows the image data acquired before the position movement of the reproduction | regeneration light in one Example. The conceptual diagram which shows the image data acquired after the position movement of the reproduction | regeneration light in one Example. The conceptual diagram which shows the defect complementation by the some reproduced image in one Example. The operation | movement flowchart of the signal processing circuit at the time of defect compensation in one Example. The figure which concerns on the defect compensation of the optical information recording / reproducing apparatus in one Example. The operation | movement flowchart of the signal processing circuit at the time of defect compensation in one Example. The figure which concerns on the defect compensation of the optical information recording / reproducing apparatus in one Example. The block diagram which shows the defect compensation circuit in one Example. The conceptual diagram which shows the detection of the defect of the photodetector in one Example. The operation | movement flowchart of the signal processing circuit at the time of defect compensation in one Example.

  Embodiments of the present invention will be described below with reference to the drawings.

  Embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a block diagram showing an optical information recording / reproducing apparatus 10 in the present embodiment. The optical information recording / reproducing apparatus 10 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. When recording an information signal, the optical information recording / reproducing apparatus 10 receives the information signal to be recorded from the external control device 91 via the input / output control circuit 90. When reproducing, the optical information recording / reproducing apparatus 10 transmits the reproduced information signal to the external controller 91 via 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 irradiates the optical information recording medium 1 with reference light and signal light, and records 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 the information recorded on the optical information recording medium 1 is reproduced, the reproduction reference light optical system 12 generates a light wave that causes the reference light emitted from the pickup 11 to be incident on the optical information recording medium in the opposite direction to that during recording. To do. Reproduction light reproduced by the reproduction reference light is detected by a photodetector (to be described later) in the pickup 11, and the signal processing circuit 85 reproduces the signal.

  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 the optical information recording medium 1 is adjusted to a predetermined rotation angle, the disk rotation angle detection optical system 14 detects a signal corresponding to the rotation angle, and the controller 89 uses the detected signal to cause the controller 89 to perform a disk rotation motor control circuit. 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 position control is performed via the access control circuit 81.

  By the way, in the recording technique using the principle of angle multiplexing of holography, the tolerance for the deviation of the reference beam angle tends to be extremely small.

  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 the optical information recording / reproducing apparatus 10 with a servo mechanism for this purpose.

  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.

  FIG. 2 is a first schematic diagram showing the pickup 11 of the optical information recording / reproducing apparatus 10 in this embodiment, and shows the recording principle in an example of a basic optical system configuration. The light beam emitted from the light source 301 passes through the collimator lens 302 and enters the shutter 303. When the shutter 303 is open, after the light beam passes through the shutter 303, the optical ratio of the p-polarized light and the s-polarized light becomes a desired ratio by the optical element 304 composed of, for example, a half-wave plate. After the polarization direction is controlled, the light enters a PBS (Polarization Beam Splitter) prism 305.

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

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

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

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

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

  FIG. 3 is a second schematic diagram showing the pickup 11 of the optical information recording / reproducing apparatus 10 in this embodiment, and shows the reproduction principle in an example of a basic optical system configuration. When reproducing the recorded information, the reference light is incident on the optical information recording medium 1 as described above, and the light beam transmitted through the optical information recording medium 1 is reflected by the galvanometer mirror 324 whose angle can be adjusted by the actuator 323. By doing so, the reproduction reference light is generated.

  The reproduction light reproduced by the reproduction reference light passes through the objective lens 315, the relay lens 313, and the spatial filter 314. Thereafter, the reproduction light passes through the PBS prism 311 and enters the photodetector 325, and the recorded signal can be reproduced. As the photodetector 325, for example, an image sensor such as a CMOS image sensor or a CCD image sensor can be used. However, any element may be used as long as page data can be reproduced.

  4A to 4C are first to third operation flowcharts of the optical information recording / reproducing apparatus 10 in the present embodiment. Here, a flow relating to recording / reproduction using holography in particular will be described.

  4A shows an operation flow from insertion of the optical information recording medium 1 into the optical information recording / reproducing apparatus 10 until preparation for recording or reproduction is completed. FIG. 4B shows information from the ready state to the optical information recording medium 1. FIG. 4C shows an operation flow until recording, and FIG. 4C shows an operation flow until the information recorded on the optical information recording medium 1 is reproduced from the ready state.

  When a medium is inserted as shown in FIG. 4A (401), the optical information recording / reproducing apparatus 10 discriminates whether or not the inserted medium is a medium for recording or reproducing digital information using holography, for example. (402).

  As a result of disc discrimination, when it is determined that the optical information recording medium records or reproduces digital information using holography, the optical information recording / reproducing apparatus 10 reads control data provided in the optical information recording medium 1 ( 403), for example, information related to the optical information recording medium 1 and information related to various setting conditions during recording and reproduction, for example.

  By performing various adjustments according to the control data and learning processing (404) related to the pickup 11, the optical information recording / reproducing apparatus 10 completes preparation for recording or reproduction (405).

  As shown in FIG. 4B, the operation flow from the ready state to recording of information is as follows. First, the controller 89 receives data to be recorded from the external control device 91 (411), and picks up information corresponding to the data 11 It is sent to the spatial light modulator 312 inside.

  Thereafter, various recording learning processes such as power optimization of the light source 301 and exposure time optimization by the shutter 303 are performed in advance so that high-quality information can be recorded on the optical information recording medium ( 412).

  Thereafter, the controller 89 controls the access control circuit 81 in the seek operation (413) to position the pickup 11 and the cure optical system 13 at predetermined positions with respect to the optical information recording medium 1.

  When the optical information recording medium 1 has address information, it reproduces the address information, checks whether it is positioned at the target position, and calculates the amount of deviation from the predetermined position if it is not positioned at the target position. And repeat the positioning operation.

  Thereafter, the controller 89 pre-cures a predetermined area using the light beam emitted from the cure optical system 13 (414), and records data using the reference light and signal light emitted from the pickup 11 (415).

  After the data is recorded, post cure is performed using the light beam emitted from the cure optical system 13 (416). Data may be verified as necessary.

  As shown in FIG. 4C, the operation flow from the ready state to the reproduction of recorded information is first a seek operation (421). The controller 89 controls the access control circuit 81 to control the pickup 11 and the reproduction reference. The position of the optical optical system 12 is positioned at a predetermined position with respect to the optical information recording medium 1.

  When the optical information recording medium 1 has address information, it reproduces the address information, checks whether it is positioned at the target position, and calculates the amount of deviation from the predetermined position if it is not positioned at the target position. And repeat the positioning operation.

  Thereafter, reference light is emitted from the pickup 11, information recorded on the optical information recording medium is read and reproduced (422), and reproduction data is transmitted to the external control device 91 (423).

  5A and 5B are operation flowcharts of the signal generation circuit 86 and the signal processing circuit 85 in this embodiment. FIG. 5A shows a recording data processing flow in the signal generation circuit 86 after the recording data is received in the input / output control circuit 90 (411 in FIG. 4B) until it is converted into two-dimensional data by the spatial light modulator 312. FIG. 5B shows a reproduction data processing flow in the signal processing circuit 85 from the detection of the two-dimensional data by the photodetector 325 to the reproduction data transmission processing (423 in FIG. 4C) in the input / output control circuit 90.

  Data processing during recording will be described with reference to FIG. 5A. When the input / output control circuit 90 receives user data (501), the signal generation circuit 86 divides the data into a plurality of data strings and converts each data string into a CRC (502) so that an error can be detected during reproduction. For the purpose of making the number of off-pixels substantially equal and preventing repetition of the same pattern, scramble (503) is performed to add a pseudo-random data sequence to the data sequence.

  Thereafter, error correction encoding (504) such as Reed-Solomon code is performed so that error correction during reproduction can be performed. Next, this data string is converted into two-dimensional data of M × N, and the two-dimensional data (505) for one page is configured by repeating this data for one page of data.

  A marker serving as a reference for image position detection and image distortion correction at the time of reproduction is added to the two-dimensional data thus configured (506), and the data is transferred to the spatial light modulator 312 of the pickup 11 (507). To do.

  Next, a data processing flow during reproduction will be described with reference to FIG. 5B.

  Image data detected by the photodetector 325 included in the pickup 11 is transferred to the signal processing circuit 85 (511). The signal processing circuit 85 detects the image position with reference to the marker included in the image data (512), corrects distortions such as the tilt, magnification, and distortion of the image (513), and then binarizes (514). Then, the marker is removed (515) to obtain two-dimensional data for one page (516). After the two-dimensional data thus obtained is converted into a plurality of data strings, error correction processing (517) is performed to remove the parity data strings.

  Next, descrambling processing (518) is performed, CRC error detection processing (519) is performed, CRC CRC is deleted, and user data is transmitted from the input / output control circuit 90 to the external control device 91 (520).

  FIG. 6 is a block diagram showing the signal generation circuit 86 of the optical information recording / reproducing apparatus 10 in this embodiment.

  When the input of user data to the output control circuit 90 is started, the input / output control circuit 90 notifies the controller 89 that the input of user data has started. In response to this notification, the controller 89 instructs the signal generation circuit 86 to record data for one page input from the input / output control circuit 90. A processing command from the controller 89 is notified to the sub-controller 601 in the signal generation circuit 86 via the control line 608. Upon receiving this notification, the sub-controller 601 controls each signal processing circuit via the control line 608 so that each signal processing circuit operates in parallel.

  First, the sub-controller 601 controls the memory control circuit 603 to store the user data input from the input / output control circuit 90 via the data line 609 in the memory 602. When the user data stored in the memory 602 reaches a certain amount, the CRC calculation circuit 604 performs control to convert the user data into CRC.

  Next, the scramble circuit 605 scrambles the CRC-converted data by adding a pseudo-random data sequence, and the error correction encoding circuit 606 performs error correction encoding by adding a parity data sequence.

  Finally, the pickup interface circuit 607 reads out the error correction encoded data from the memory 602 in the arrangement order of the two-dimensional data in the spatial light modulator 312 and adds a reference marker at the time of reproduction. The two-dimensional data is transferred to the spatial light modulator 312.

  FIG. 7 is a block diagram showing the signal processing circuit 85 of the optical information recording / reproducing apparatus 10 in this embodiment.

  When the optical detector 325 of the pickup 11 detects the image data, the controller 89 instructs the signal processing circuit 85 to reproduce the data for one page input from the pickup 11. A processing command from the controller 89 is notified to the sub-controller 701 of the signal processing circuit 85 via the control line 711. Upon receiving this notification, the sub-controller 701 controls each signal processing circuit via the control line 711 so that the signal processing circuits are operated in parallel.

  First, the sub-controller 701 controls the memory control circuit 703 to store the image data input from the pickup 11 via the pickup interface circuit 710 via the data line 712 in the memory 702. When the data stored in the memory 702 reaches a certain amount, the image position detection circuit 709 performs control to detect a marker from the image data stored in the memory 702 and extract a valid data range.

  Next, the image distortion correction circuit 708 performs distortion correction such as image inclination, magnification, distortion, and the like using the detected marker, and controls to convert the image data into the expected two-dimensional data size. Each bit data of a plurality of bits constituting the size-converted two-dimensional data is binarized into “0” and “1” in the binarization circuit 707, and the data is stored in the memory 702 in the arrangement of the reproduction data output. Take control.

  Next, the error correction circuit 706 corrects an error included in each data string, the scramble release circuit 705 cancels the scramble added with the pseudo-random number data string, and then the CRC calculation circuit 704 causes an error in the user data in the memory 702. Make sure it is not included. Thereafter, user data is transferred from the memory 702 to the input / output control circuit 90.

  Here, in the optical information recording / reproducing apparatus of the present embodiment described above, reproduction image defect compensation, which is a feature of the present embodiment, will be described. In this defect compensation, when it is determined that the reproduced image cannot be decoded, the reproduction light position in the photodetector is moved so as to avoid the stored defect, then the reproduced image is obtained again, and a plurality of images before and after the movement are obtained. The defect is complemented from the image. This defect compensation method will be described in detail with reference to FIGS.

  FIG. 8 is a conceptual diagram showing defect detection of the photodetector 325 in the present embodiment.

  First, in the data processing at the time of recording, the number of on-pixels and the number of off-pixels are made almost equal, and scramble (FIG. 5A, 803) is performed by adding a pseudo-random data sequence to the data sequence for the purpose of preventing repetition of the same pattern. The recorded data is reproduced by a plurality of pages, and the average of each pixel value of the photodetector 325 is taken. In this way, the pixel average value is expected to be an intermediate value between the on pixel and the off pixel.

  However, as shown in FIG. 8, when the light defect 801 is present in the photodetector 325, the average of the corresponding pixel value 811 is substantially equal to the on-pixel value, and is applicable to the dark defect 802. The average of the pixel values 912 is approximately equal to the off pixel value.

  Therefore, by continuously reproducing a plurality of pages and taking the average value of each pixel of the photodetector 325, it is possible to find the bright defect 801 and the dark defect 802 of the photodetector 325, respectively.

  FIG. 9 is a conceptual diagram showing defect detection of the photodetector 325 in the present embodiment, and FIG. 10 is a diagram relating to defect compensation of the optical information recording / reproducing apparatus 10 in the present embodiment.

  The defect detection process of the photodetector is performed at the timing of the learning process 404 shown in FIG. 4A, for example. The detected defect position is shown, for example, as shown in FIG. 9, and is stored in the defect position storage circuit 103 of FIG.

  Although the detection of the defect position of the photodetector has been described here, not only the defect of the photodetector but also the defect position on the photodetector caused by a fixed factor such as dust or dust in the optical path can be detected.

  Next, image defect compensation is performed using the detected defect position information. Image defect compensation will be described with reference to FIGS.

  FIG. 11 is an operation flowchart of the signal processing circuit 85 at the time of defect compensation in this embodiment.

  First, the light detector 325 detects the reproduction light 326 for reproducing a predetermined page (511), detects the image position based on the detected signal (512), and the detected signal is an image distortion correction circuit. The image distortion is corrected in step 708 (513), and the reproduced image in which the image distortion is corrected is input to the image defect compensation circuit 105.

  FIG. 12 is a block diagram showing the defect compensation circuit 105 in one embodiment. The image defect compensation circuit 105 stores the reproduced image whose image distortion, which is the output of the image distortion correction circuit 708, is stored in the image storage circuit 1201 (1101) and is input to the image composition circuit 1203. Since the switch 1202 is open in the initial state, the reproduced image input to the image composition circuit 1203 is input as it is to the error correction circuit 706 and subjected to error correction processing (514).

  Thereafter, the defect compensation control circuit 101 determines whether or not the defect compensation is necessary (1102). Error information included in user data after error correction is used as a criterion for determining whether or not defect compensation is necessary.

  If no error is included in the user data after error correction, the defect compensation control circuit 101 determines that there is no need for defect compensation (No in 1102), and the optical information recording / reproducing apparatus 10 performs error correction processing. Is output to the external control device 91 via the input / output control circuit 90 (520).

  On the other hand, if an error is included, the defect compensation control circuit 101 determines that defect compensation is necessary (Yes in 1102), closes the switch 1202, and causes the controller 89 and the reproduction light position control amount calculation circuit 102 to Notify that retry processing is required.

  At this time, in order to compensate for defects in the reproduced image due to fixed factors such as dust generated on the optical path of the reproduced light 326 and on the photodetector 325, scratches, and defects generated during manufacturing, the reproduced light 326 It is necessary to move the optical path and the reproduction light position on the photodetector 325. The reproduction light position control amount is calculated by inputting defect position information from the defect position storage circuit 103 to the reproduction light position control amount calculation circuit 102.

  An example of a method for calculating the reproduction light position control amount will be described with reference to FIG. FIG. 13 is a conceptual diagram related to the defect position of the photodetector 325 in one embodiment, and shows the positional relationship between the defect position information and the reproduced image.

  Of the defects (a and b in FIG. 13) in the reproduced image information generated by the defect of the photodetector 325, the size in the X direction (the X direction size of a in FIG. 13) of the defect having the largest size in the X direction The size in the Y direction of the defect having the largest size in the Y direction (the Y direction size in FIG. 13B) is compared. The direction in which the size is smaller in comparison of the two sizes, that is, the defect size in the X direction of a in FIG.

  As a result, the smallest reproducing light position control amount necessary for defect compensation is calculated (1103). Although the minimum necessary reproduction light position control amount is obtained here, the reproduction light position control amount may be small or large as long as a plurality of images can be acquired without overlapping defective portions. Further, here, an example in which the calculation of the reproduction light position control amount is performed at the time of retry processing is shown, but the reproduction light position control amount may be calculated when the defect position is detected and stored in the defect position storage circuit 103.

  The reproduction light position control circuit 104 supplied with the calculated reproduction light position control amount 106 controls the reproduction light position (1104).

  An example of a method for controlling the reproduction light position will be described with reference to FIGS. 14A and 14B. 14A and 14B are first and second schematic views of the pickup 11 showing the movement of the position of the reproduction light in the present embodiment. As shown in FIG. 14A, the optical axis of the reproduction light 326 from the recording medium 1 is designed to pass through the centers of the objective lens 315 and the relay lens 313 in the initial state. As shown in FIG. 14B, by changing the angles of the recording medium 1 and the reference light 307, the incident angle 1401 of the optical axis of the reproduction light 326 with respect to the objective lens 315 is changed, and the reproduction light position is controlled.

  Note that the relative angle between the reference light and the recording medium is not changed by changing the incident angle of the optical axis of the reproduction light 326 and the angle of the recording medium 1 together. By controlling the position of the reproduction light in this way, it is possible to accurately compensate for a defect in the reproduction image caused by a defect in the light detection unit or the optical component while satisfying the reproduction condition of the reference light in the angle multiplexing direction.

  Here, the angles of the recording medium 1 and the reference light 307 are changed at the same time, but only the angle of the recording medium or the reference light may be changed. As a result, the number of objects to be controlled is reduced, and the processing can be simplified.

  Further, the reproduction light position may be controlled by shifting the position of the recording medium instead of the angle of the recording medium. As a result, the reproduction light position can be controlled only by shifting the recording medium, so that the processing can be simplified.

  Note that the reproduction light position may be controlled by moving the relay lens 313 instead of the recording medium.

  A method of controlling the reproduction light position by moving the relay lens will be described with reference to FIGS. 15A and 15B. 15A and 15B are third and fourth schematic views of the pickup 11 showing the movement of the position of the reproduction light in the present embodiment. As shown in FIG. 15A, the optical axis of the reproduction light 326 is designed to pass through the center of the relay lens 313 in the initial state. As shown in FIG. 15B, when the position of the relay lens 313 is moved, the optical axis of the reproduction light 326 does not pass through the center of the relay lens 313, so that the reproduction light 326 is refracted. For example, when the relay lens 2301 is moved to the left in the drawing, the center of the reproduction light 326 passes to the right of the relay lens 2301, and is refracted to the left.

  Here, since it is desirable that the reproduction light 326 incident on the photodetector 325 is parallel light, the relay lens 2302 is moved to a position where the reproduction light 326 can be returned to parallel light. By moving the relay lens 2302 around the spatial filter 314 to the opposite side of the relay lens 2301, the reproduction light 325 can be made parallel light.

  Although the relay lens 313 has been described in the above configuration, an optical element for controlling the reproduction light position may be disposed instead of the relay lens 313. This makes it possible to control the reproduction light position with high accuracy by moving the optical element. Further, the reproduction light position may be controlled by moving any or all of the components of the optical system. This makes it possible to control the reproduction light position with high accuracy.

  The reproduction light position may be controlled by changing the wavelength of light emitted from the light source. As a result, the reproduction light position can be controlled without moving the recording medium and the optical unit, so that the processing can be simplified.

  After moving the reproduction light position based on the reproduction light position control amount 106 calculated as described above, the controller 89 receives a retry process notification and performs the reproduction process on the same page.

  The reproduction light 326 whose position has been moved is detected again by the photodetector 325 (1105), and image position detection is performed (1106). The detected reproduced image is input to the image distortion correction circuit 708 to correct the image distortion (1107), and the reproduced image whose image distortion has been corrected is input to the image defect compensation circuit 105.

  The image storage circuit 1201 of the image defect compensation circuit 105 stores the reproduction image acquired before moving the reproduction light position, and the switch 1202 in FIG. Then, a reproduction image before reproduction light position control (FIG. 16A) and a reproduction image after reproduction light position control (FIG. 16B) are acquired.

  FIG. 16A is a conceptual diagram showing image data acquired before the position movement of the reproduction light in the present embodiment, and FIG. 16B is a conceptual diagram showing image data acquired after the position movement of the reproduction light in the present embodiment. .

  Using the plurality of reproduced images, a defective portion of the reproduced image is complemented (1108).

  An example of an image defect portion complementing method will be described with reference to FIG. FIG. 17 is a conceptual diagram showing defect complementation by a plurality of reproduced images in one embodiment.

  The image of the portion corresponding to the defective portion (a in FIG. 17) of the image before the movement of the reproduction light is extracted from the image after the movement of the position of the reproduction light (b in FIG. 17) and replaced to complement the reproduction image. . Here, the image is complemented by replacing the defective portion of the image before moving the position of the reproduction light, but conversely, the defective portion of the image after moving the position of the reproduction light is extracted from the image before the movement and replaced. May be supplemented.

  The image synthesized by using the above method is input to the error correction circuit 706 shown in FIG. 10, error correction processing is performed (1109), the switch 1202 is opened, and the reproduced image after the error correction processing is input / output control circuit 90. To the external control device 91 (step 520). At this time, the necessity for defect compensation may be determined again, and the retry process may be repeated if there is a need for defect compensation.

  According to the first embodiment described above, defects in the reproduced image due to defects in the light detection unit and the optical component can be complemented, and highly reliable reproduction is possible.

  In the above configuration, only the defective portion of the reproduced image is replaced, but an average of pixels corresponding to a plurality of images may be taken with respect to the reproduced image portion in which no defect is generated. As a result, noise components can be averaged, so that signal quality can be improved.

  Further, here, a plurality of reproduction images are acquired by moving the position of the reproduction light. However, signal quality may be improved by combining a plurality of reproduction images acquired without moving the position of the reproduction light.

  Further, the optical information recording / reproducing apparatus 10 may perform oversampling for detecting a reproduced image using a photodetector having a larger number of pixels than the spatial light modulator in order to improve the accuracy of distortion correction. In this case, the image distortion correction circuit 708 performs resampling processing for converting the oversampled image into the original reproduction image size. At this time, in this embodiment, the image defect compensation 105 is provided after the image distortion correction circuit 708. However, the image defect compensation may be performed before the image distortion correction. By performing image defect compensation on the reproduced image before image distortion correction, finer defect compensation is possible. The same applies to the following embodiments.

  The present embodiment is different from the first embodiment in that defect compensation determination is not performed and defect compensation is performed on reproduced images of all pages. As described above, the error correction circuit 806 and the defect compensation control circuit 101 determine the necessity of defect compensation of the reproduced image and perform defect compensation. If no compensation is necessary, the retry process associated with the defect compensation process is performed. The number of times can be reduced and the processing can be simplified. However, in order to determine the necessity for defect compensation, it is necessary to correct the error of the reproduced image, and there is a problem that the processing becomes heavy. In view of this, the present embodiment performs defect compensation for a reproduced image of any page.

  The defect compensation procedure of the present embodiment will be described with reference to FIG. 10, FIG. 12, and FIG. FIG. 18 is an operation flowchart of the signal processing circuit during defect compensation in this embodiment.

  Here, the defect position storage circuit 103 stores the defect position of the photodetector 325 and the defect position on the photodetector due to fixed factors such as dust and dirt in the optical path by the above-described defect detection processing of the photodetector. Has been.

  First, the reproduction light 326 is detected by the photodetector 325 (511), the image position is detected (512), the detected reproduction image is input to the image distortion correction circuit 708, and the image distortion is corrected (513). The reproduced image whose distortion has been corrected is input to the image defect compensation circuit 105. The configuration of the image defect compensation circuit 105 is shown in FIG.

  In the image defect compensation circuit 105, a reproduced image obtained by correcting the image distortion output from the image distortion correction circuit 708 is stored in the image storage circuit 1201 (1101) and input to the image composition circuit 1203.

  Since the switch 1202 is open in the initial state, the defect compensation control circuit 101 always closes the switch 1202 so that defect compensation is performed on the reproduced images of all pages, and the controller 89 and the reproduction light position control amount in FIG. The calculation circuit 102 is notified that retry processing is required. In response to the fact that the retry process is required, the controller 89 controls the retry process.

  The configuration and operation of the retry process are the processes indicated by 1103 to 520 in the flowchart of FIG. 18 and are the same as those in the flowchart of FIG.

  According to the second embodiment described above, the signal quality can be improved by performing defect compensation on the reproduced images of all pages.

  This embodiment is different from the second embodiment in that a plurality of images are acquired without moving the reproduction light position. As described above, when a plurality of images are acquired by moving the reproduction light position, it is necessary to control the recording medium and the optical system, which causes a problem that the processing becomes complicated. In view of this, the present embodiment improves signal quality by acquiring and combining a plurality of images without moving the reproduction light position.

  The defect compensation procedure in the present embodiment will be described with reference to FIGS. FIG. 19 is a diagram relating to defect compensation of the optical information recording / reproducing apparatus in the present embodiment, and FIG. 20 is an operation flow diagram of the signal processing circuit at the time of defect compensation in the present embodiment.

  First, the reproduction light 326 is detected by the photodetector 325 (511), the image position is detected (512), the detected reproduction image is input to the image distortion correction circuit 708, and the image distortion is corrected (513). The reproduced image whose distortion has been corrected is input to the image defect compensation circuit 105. The configuration of the image defect compensation circuit 105 is shown in FIG.

  In the image defect compensation circuit 105, a reproduced image obtained by correcting the image distortion output from the image distortion correction circuit 708 is input to the image storage circuit 1201 and the image composition circuit 1203 in FIG. Since the switch 1202 is open in the initial state, the defect compensation control circuit closes the switch 1202 and notifies the controller 89 that retry processing is necessary. In response to the necessity of retry processing, the controller 89 performs playback processing on the same page.

  The reproduction light 326 is detected again by the photodetector 325 (1105), and the image position is detected (1106). The detected reproduced image is input to the image distortion correction circuit 708 to correct the image distortion (1107), and the reproduced image with the corrected image distortion is input to the image defect compensation circuit 105.

  The image storage circuit 1201 of the image defect compensation circuit 105 stores a reproduction image before retry, and the image composition circuit 1203 can acquire an image before retry and a reproduction image after retry. By taking an average of a plurality of reproduced images in the image composition circuit 1203, noise components can be averaged, and signal quality can be improved.

  According to the third embodiment described above, signal quality can be improved with simplified processing by acquiring and combining a plurality of reproduced images without moving the reproduction light position.

  This embodiment is different from the first embodiment in that defect detection is performed based on the error correction result of the reproduced image. As described above, when the method of detecting the defect position in the learning process 404 in FIG. 4A and storing the defect position information in the defect position storage circuit is used, it is possible to detect the defect generated in the process after the learning process 404. There is a problem that it is not possible. In view of this, the present embodiment stores a position where an error has occurred in error correction processing at the time of decoding a reproduced image, and detects a portion where an error has occurred continuously as a defect.

  The defect detection procedure in the present embodiment will be described with reference to FIGS. FIG. 21 is a diagram relating to defect compensation of the optical information recording / reproducing apparatus in the present embodiment, FIG. 22 is a block diagram showing a defect compensation circuit in the present embodiment, and FIG. 23 is a diagram showing defects in the photodetector in the present embodiment. FIG. 24 is a conceptual diagram showing detection, and FIG. 24 is an operation flowchart of the signal processing circuit at the time of defect compensation in this embodiment.

  The reproduced light 326 is detected by the photodetector 325, and the reproduced image whose image distortion has been corrected is input to the image defect compensation circuit 105. The configuration of the image defect compensation circuit 105 is shown in FIG.

  In the image defect compensation circuit 105, a reproduced image obtained by correcting the image distortion output from the image distortion correction circuit 708 is input to the image storage circuit 1201 and the image composition circuit 1203. Since the switch 1202 is open in the initial state, the reproduced image input to the image composition circuit 1203 is input to the error correction circuit 706 as it is to perform error correction processing.

  When error correction processing is performed in the error correction circuit 706, a position where an error has occurred is detected and stored in the error position storage circuit 2101 (2401). The error position is continuously recorded by reproducing the plurality of page data, and the defect position is calculated by inputting the error position information of the stored plurality of page data to the defect position detection circuit 2002 (2402).

  A defect position detection method using error position information will be described with reference to FIG.

  In FIG. 23, the relationship between the photodetector 325, the reproduction light detection position, and the error position is shown by arranging four pages from the Nth page to the N + 3th page.

  In the case of a non-fixed error caused by an error at the time of page data recording or random noise, the error position changes by reproducing a different page (circle in FIG. 23). On the other hand, the error position due to fixed factors such as dust and scratches generated on the optical path of the reproduction light 326 and on the photodetector 325, and defects generated during manufacturing does not change even when different pages are reproduced (FIG. 23). X).

  For example, if an error occurs in the same position on all pages in the same book, an error occurs in the same position even after moving the book, or an error occurs in the same position in the same cure site, there is a defect. It can be judged. Here, the cure site is a minimum recording unit for performing the pre-cure or the post-cure.

  According to the fourth embodiment described above, it is possible to detect a defect in real time by detecting and verifying an error position of a reproduced image, and it is possible to perform highly accurate compensation at the time of defect compensation. Even if the defect detection method is different, for example, a method for moving the position of the reproduction light as shown in the first embodiment is used for defect compensation.

  The present invention is not limited to the above-described embodiments, and includes various modifications. 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.

  The modifications are as follows.

  As a first modification, an optical information reproducing apparatus for reproducing information recorded on an optical information recording medium, the light source unit for irradiating light for reproducing the information recorded on the optical information recording medium, and the light source An optical unit that causes the light emitted from the unit to enter the optical information recording medium, and a reproduction light for reproducing information from the light incident on the optical information recording medium, and based on a signal generated from the reproduction light And generating a third reproduction image of the predetermined signal based on the first and second reproduction images obtained by the light detection unit and the first and second reproduction images obtained by the light detection unit. There is an optical information reproduction device including an image generation unit and a control unit that controls the operation of the optical information reproduction device.

  As a second modification, an optical information reproducing apparatus that reproduces information recorded on an optical information recording medium using interference between signal light and reference light, a light source unit that emits light to the optical information recording medium, An optical unit for generating the reference light from the light emitted from the light source unit and irradiating the optical information recording medium with the reference light, and for reproducing information from the reference light irradiated on the optical information recording medium A light detection unit that detects reproduction light and acquires first and second reproduction images generated from a signal detected from the reproduction light, and the first and second reproduction images acquired by the light detection unit There is an optical information reproducing device comprising: an image generating unit that generates a third reproduced image of the predetermined signal, and a control unit that controls the operation of the optical information reproducing device.

  As a third modification, an optical information reproducing method in an optical information reproducing apparatus for reproducing information recorded on an optical information recording medium, the step of irradiating light for reproducing information recorded on the optical information recording medium And a step of causing the irradiated light to enter the optical information recording medium, and detecting a reproduction light for reproducing information from the light incident on the optical information recording medium, and based on a signal generated from the reproduction light Optical information comprising: obtaining first and second reproduced images; and generating a third reproduced image of the predetermined signal based on the obtained first and second reproduced images. There is a playback method.

  As a fourth modification, there is provided an optical information reproducing apparatus for reproducing image signal data recorded on an optical recording medium, wherein light for reading the image signal data recorded on the optical recording medium is generated to generate the optical signal. A light source unit for irradiating the optical recording medium, an optical unit for propagating light generated by the light source unit to the optical recording medium and propagating light through the optical recording medium, and the optical unit for the optical recording A light detection unit that detects light propagated from a medium to acquire the image signal data, and the optical unit and the light detection based on a plurality of images generated from the same image signal data acquired by the light detection unit There is an optical information reproducing apparatus including an image defect compensating unit that compensates for a defect in a reproduced image caused by the unit.

  As a fifth modification, in the optical information reproduction apparatus according to the fourth modification, the image defect compensation unit synthesizes the plurality of images to compensate for defects in the reproduction image. .

  As a sixth modification, in the optical information reproducing apparatus according to the fifth modification, when the plurality of images are combined, the image defect compensation unit corresponds to a portion where the defect does not occur between the plurality of images. An optical information reproducing apparatus characterized by obtaining an average value of pixels, or a defect compensation control unit that determines whether or not the reproduced image can be decoded from the reproduced image signal data, and the defect compensation control In the optical information reproducing apparatus, the image defect compensating unit compensates for the defect of the reproduced image when the unit determines that the reproduced image cannot be decoded.

  As a modification example 7, in the optical information device according to the modification example 5, a defect position storage unit that stores information on the position of the defect included in the light detection unit and the optical unit propagated from the optical recording medium A reproduction light position control unit that moves a position where light is irradiated to the light detection unit, and information for the reproduction light position control unit to move the optical unit based on the information stored in the defect position storage unit And a control amount calculation unit for calculating the defect of the first reproduction image acquired by the light detection unit before the reproduction light position control unit moves the optical unit. There is an optical information reproducing apparatus that compensates based on a second reproduced image acquired by the light detecting unit after the reproducing light position control unit moves the optical unit.

  As an eighth modification, in the optical information reproducing apparatus according to the seventh modification, the optical recording medium is a recording medium that records an interference fringe obtained by causing the reference light and the signal light to interfere with each other as a hologram. A defect compensation control unit that determines whether or not the reproduced image can be decoded from the reproduced image signal data, and the defect compensation control unit determines that the reproduced image cannot be decoded. In this case, the image defect compensation unit compensates for defects in the reproduced image, or the defect position storage unit stores information on the position of the defect included in the light detection unit. An optical information reproducing apparatus, wherein the light detection unit learns and stores the image signal data before acquiring the image signal data, or the defect position storage unit stores information on the position of the defect included in the light detection unit. An optical information reproducing apparatus or a reproducing light position control unit, which stores data based on an error correction result with respect to the image signal data acquired by the light recording detecting unit, is a position or an inclination of the optical recording medium. The optical information reproducing apparatus, or the reproducing light position control unit, is configured to move the position where the light propagated from the optical recording medium by the optical unit is irradiated to the light detecting unit. An optical information reproducing apparatus that controls a position or an inclination of the optical unit to move a position at which the light propagated from the optical recording medium by the optical unit is applied to the light detection unit, Alternatively, the reproduction light position control unit controls a wavelength of light generated by the light source unit, and moves a position where light propagated from the optical recording medium by the optical unit is applied to the light detection unit. It is an optical information reproducing apparatus according to claim.

  As a ninth modification, there is provided an optical information reproducing method in an optical information reproducing apparatus for reproducing image signal data recorded on an optical recording medium, wherein the optical information reproducing apparatus includes an image signal recorded on the optical recording medium. A light source unit that generates light for reading data and irradiates the optical recording medium, and the light generated by the light source unit propagates to the optical recording medium and propagates light through the optical recording medium. An acquisition step of acquiring the image signal data by including an optical unit and a light detection unit that acquires the image signal data by detecting light propagated from the optical recording medium by the optical unit; And an image storage step for storing a plurality of images generated from the same image signal data acquired in the acquisition step, and the optical unit and the light detection unit based on the image stored in the image storage step Re There is an optical information reproducing method characterized by and an image defect compensation step of compensating a defect of the image.

  As a tenth modification, in the optical information reproduction method according to the ninth modification, the defect compensation control step for determining whether or not the reproduced image can be decoded from the reproduced image signal data, the defect compensation control step In the optical information reproducing method, when it is determined that the reproduced image cannot be decoded, the image defect compensation step compensates for the defect of the reproduced image.

  As a modified example 11, in the optical information reproducing method according to the modified example 9, a defect position storing step for storing information related to the position of the defect included in the light detection unit, and the optical unit propagates from the optical recording medium. A reproduction light position control step for moving the position at which the light is irradiated on the light detection unit, and the reproduction light position control step for moving the optical unit based on the information stored in the defect position storage step. A control amount calculation step for calculating information, wherein the image defect compensation step includes a defect of the first reproduction image acquired by the light detection unit before the reproduction light position control step moves the optical unit. There is an optical information reproduction method characterized in that the reproduction light position control step compensates based on a second reproduction image acquired by the light detection unit after moving the optical unit. .

  As a modified example 12, in the optical information reproducing method described in the modified example 11, the optical recording medium is a recording medium that records an interference fringe obtained by interfering the reference light and the signal light as a hologram. The optical information reproducing method or the defect position storing step learns and stores information related to the position of the defect included in the light detection unit before the light detection unit acquires the image signal data. The optical information reproducing method or the defect position storing step stores information related to the position of the defect included in the light detection unit based on an error correction result for the image signal data acquired by the light detection unit. There is an optical information reproducing method characterized by this.

  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 memory, a hard disk, a recording device such as an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD.

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

DESCRIPTION OF SYMBOLS 1 ... Optical information recording medium, 10 ... Optical information recording / reproducing apparatus, 11 ... Pickup, 12 ... Reference optical system for reproduction | regeneration, 13 ... Disc Cure optical system, 14 ... Disc Rotation angle detection optical system, 81 ... access control circuit, 82 ... light source drive circuit, 83 ... servo signal generation circuit, 84 ... servo control circuit, 85 ... signal processing circuit, 86 ..Signal generation circuit, 87... Shutter control circuit, 88... Disk rotation motor control circuit, 89... Controller, 90. Defect compensation control circuit 102... Reproduction light position control amount calculation circuit 103. Defect position storage circuit 104. Reproduction light position control circuit 105... Image defect compensation circuit 301. Light source, 303 ... Shutter, 306 ... signal light, 307 ... reference light,
308 ... Beam expander, 309 ... Phase mask, 310 ... Relay lens, 311 ... PBS prism, 312 ... Spatial light modulator, 313 ... Relay lens, 314 ..Spatial filter
315 ... objective lens, 316 ... polarization direction conversion element, 320 ... actuator, 321 ... lens, 322 ... lens, 323 ... actuator, 324 ... mirror, 325 ... Photodetector, 326... Reproduction light 1201... Image storage circuit, 1202... Switch, 1203.

Claims (15)

An optical information reproducing apparatus for reproducing information recorded on an optical information recording medium,
A light source unit that emits light for reproducing information recorded on the optical information recording medium;
An optical unit for causing the light emitted from the light source unit to enter the optical information recording medium;
A light detection unit for detecting reproduction light for reproducing information from light incident on the optical information recording medium, and acquiring first and second reproduction images based on a signal generated from the reproduction light;
An image generation unit that generates a third reproduction image of the predetermined signal based on the first and second reproduction images acquired by the light detection unit;
A control unit for controlling the operation of the optical information reproducing apparatus;
An optical information reproducing apparatus comprising: The optical information reproducing apparatus according to claim 1,
When the first reproduction image is acquired, the reproduction light position where the reproduction light is incident on the light detection unit is the same as the reproduction light position where the reproduction light is incident on the light detection unit when the second reproduction image is acquired. Different from the playback light position
An optical information reproducing apparatus characterized by the above. The optical information reproducing apparatus according to claim 2,
The control unit detects a defect in the light detection unit, stores the position of the defect as defect position information, and acquires the second reproduction image, and then acquires the light detection unit based on the defect position information. Control to move the position where the reproduction light enters,
An optical information reproducing apparatus characterized by the above. The optical information reproducing apparatus according to claim 2,
When the control unit acquires the second reproduction image, the reproduction light is incident on the light detection unit by changing at least one of the tilt and the position of the optical information recording medium. Control the playback light position to be different,
An optical information reproducing apparatus characterized by the above. The optical information reproducing apparatus according to claim 2,
The image generation unit extracts an image corresponding to a defective portion of the first reproduced image from the second reproduced image, and complements the defective portion of the first image with the extracted image, Generating a third playback image;
An optical information reproducing apparatus characterized by the above. An optical information reproducing apparatus for reproducing information recorded on an optical information recording medium using interference between signal light and reference light,
A light source unit for emitting light to the optical information recording medium;
An optical unit that generates the reference light from the light emitted from the light source unit and irradiates the optical information recording medium with the reference light;
Light detection for detecting reproduction light for reproducing information from the reference light irradiated on the optical information recording medium and acquiring first and second reproduction images generated from a signal detected from the reproduction light And
An image generation unit that generates a third reproduction image of the predetermined signal based on the first and second reproduction images acquired by the light detection unit;
A control unit for controlling the operation of the optical information reproducing apparatus;
An optical information reproducing apparatus comprising: The optical information reproducing apparatus according to claim 6,
When the first reproduction image is acquired, the reproduction light position where the reproduction light is incident on the light detection unit is the same as the reproduction light position where the reproduction light is incident on the light detection unit when the second reproduction image is acquired. Different from the playback light position
An optical information reproducing apparatus characterized by the above. The optical information reproducing apparatus according to claim 7,
The control unit detects a defect in the light detection unit, stores the position of the defect as defect position information, and acquires the second reproduction image, and then acquires the light detection unit based on the defect position information. Control to move the position where the reproduction light enters,
An optical information reproducing apparatus characterized by the above. The optical information reproducing apparatus according to claim 7,
The control unit obtains at least one of an inclination, a position of the optical information recording medium, and an angle at which the reference light is incident on the optical information recording medium when acquiring the second reproduced image. By changing, it controls to change the reproduction light position where the reproduction light is incident on the light detection unit,
An optical information reproducing apparatus characterized by the above. The optical information reproducing apparatus according to claim 7,
The image generation unit extracts an image corresponding to a defective portion of the first reproduced image from the second reproduced image, and complements the defective portion of the first image with the extracted image, Generating a third playback image;
An optical information reproducing apparatus characterized by the above. An optical information reproducing method in an optical information reproducing apparatus for reproducing information recorded on an optical information recording medium,
Irradiating light for reproducing the information recorded on the optical information recording medium;
Causing the irradiated light to enter the optical information recording medium;
Detecting reproduction light for reproducing information from light incident on the optical information recording medium, and obtaining first and second reproduction images based on a signal generated from the reproduction light;
Generating a third reproduced image of the predetermined signal based on the acquired first and second reproduced images;
An optical information reproducing method comprising: The optical information reproducing method according to claim 11, comprising:
The optical information reproducing apparatus has a light detection unit for detecting reproduction light for reproducing information from light incident on the optical information recording medium,
In the step of acquiring a reproduction image, when the first reproduction image is acquired, the reproduction light position at which the reproduction light is incident on the light detection unit is the light beam position when the second reproduction image is acquired. Different from the reproduction light position where the reproduction light is incident on the detection unit,
An optical information reproducing method characterized by the above. The optical information reproducing method according to claim 12, comprising:
Detecting a defect of the light detection unit;
Storing the position of the defect as defect position information;
In the step of acquiring the reproduction image, when acquiring the second reproduction image, the step of moving the position where the reproduction light is incident on the light detection unit based on the defect position information;
An optical information reproducing method comprising: The optical information reproducing method according to claim 12, comprising:
In the step of obtaining a reproduction image, when obtaining the second reproduction image, the inclination or the position of the optical information recording medium is changed.
An optical information reproducing method characterized by the above. The optical information reproducing method according to claim 12, comprising:
In the step of generating the third reproduced image, an image corresponding to the defective portion of the first reproduced image is extracted from the second reproduced image, and the defective portion of the first image is extracted from the extracted image. Generating the third reproduced image by complementing,
An optical information reproducing method characterized by the above.

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