WO2007049605A1 - Disque optique multicouche et appareil a disque optique - Google Patents

Disque optique multicouche et appareil a disque optique Download PDF

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Publication number
WO2007049605A1
WO2007049605A1 PCT/JP2006/321145 JP2006321145W WO2007049605A1 WO 2007049605 A1 WO2007049605 A1 WO 2007049605A1 JP 2006321145 W JP2006321145 W JP 2006321145W WO 2007049605 A1 WO2007049605 A1 WO 2007049605A1
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WO
WIPO (PCT)
Prior art keywords
optical disc
information
interlayer
multilayer optical
distance
Prior art date
Application number
PCT/JP2006/321145
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English (en)
Japanese (ja)
Inventor
Ryutaro Futakuchi
Naoyasu Miyagawa
Original Assignee
Matsushita Electric Industrial Co., Ltd.
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Application filed by Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Publication of WO2007049605A1 publication Critical patent/WO2007049605A1/fr

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0945—Methods for initialising servos, start-up sequences
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2403—Layers; Shape, structure or physical properties thereof
    • G11B7/24035—Recording layers
    • G11B7/24038—Multiple laminated recording layers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
    • G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
    • G11B2007/0013—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete layers

Definitions

  • the present invention relates to a multilayer optical disc having a multilayer structure, and an optical disc apparatus for recording information on the multilayer optical disc and reproducing information from a Z or multilayer optical disc.
  • Patent Document 1 As a commercially available multilayer optical disc, a Blu-ray disc (hereinafter referred to as BD) is known, although it has a two-layer structure. Being
  • the interlayer distance is specified as 20 ⁇ m force up to 30 ⁇ m
  • the interlayer variation is specified as less than 2 m.
  • the number of layers is 3, so the variation is 6 ⁇ m, and in the case of the 8-layer structure, the variation is 14 ⁇ m, and the variation increases as the number of layers increases.
  • the size of the increase increases, and in the case of a multilayer structure with more than that, it is assumed that the accumulated variation exceeds 20 m.
  • the accumulation of the variation in the interlayer distance due to the increase in the number of layers is the regulation of the interlayer distance.
  • the accumulated value of the interlayer distance may exceed the total value of multiple interlayer distances.
  • an interlayer focus jump that forcibly moves the position of the objective lens provided in the optical pickup for signal recording / reproducing to within the focal depth of the recording / reproducing surface.
  • the movement distance of the objective lens described above during the interlayer focus jump operation differs for each jump operation.
  • the moving distance is unknown.
  • the accumulated energy of the interlayer distance exceeds the total of the plurality of interlayer distances.
  • the degree of over- or under-examination is so large that it cannot be compared with multi-layering with a relatively small number of layers. In other words, it can be said that further increase in multi-layering promotes a more serious problem.
  • the movement of the objective lens to a desired recording / reproducing surface force is caused by an interlayer focus jump operation in an optical disk having a two-layer structure, that is, from the first recording / reproducing surface to the second recording / reproducing surface. It must be said that it will be extremely difficult compared to the movement leading to.
  • Patent Document 2 for example, even if the moving distance from one recording / reproducing surface to another recording / reproducing surface is unknown, an interlayer distance detecting means is provided and based on the detection result of the interlayer distance detecting means.
  • a method for guaranteeing the interlayer focus jump operation by controlling the setting of the jump pulse generating means for performing the interlayer focus jump operation is disclosed.
  • the addition of the interlayer distance detection means described above further complicates the configuration of the focus servo, and includes the interlayer distance detection means.
  • it requires additional time for verification and evaluation of the validity of the focus servo system, resulting in an overall increase in cost.
  • the method for detecting an interlayer distance according to Patent Document 2 described above uses a generally well-known focus search operation, and the procedure is as follows.
  • the S-shaped waveform in the two layers is observed by forcibly moving the objective lens up and down across the two layers.
  • measure the time interval between the two zero cross points appearing in the S-shaped waveform that is, the point indicating the detection of the focal point position of each layer, and determine the distance between the two layers from the speed at which the objective lens moves up and down. Is calculated.
  • the forced vertical movement of the objective lens in the focus search operation is a periodic movement of about 200 msec
  • the detection of the interlayer distance according to Patent Document 2 described above is a single cycle, that is, Even if the distance between two layers can be detected by one focus search operation, the time required for the detection is at least 200 msec.
  • the number of layers is 3, so the total time required for detection is 600 msec, and in the case of the 8-layer structure, the total detection time is 1400 msec.
  • Patent Document 1 Japanese Patent Publication No. 10-505188
  • Patent Document 2 Japanese Patent Laid-Open No. 10-143872
  • the present invention has been made to solve the above-described problems, and is stable against variations in interlayer distance in each multilayer optical disk and variations in interlayer distance due to disk manufacturing problems. It is an object of the present invention to provide a multilayer optical disc and an optical disc apparatus capable of ensuring the above.
  • the multilayer optical disc according to one aspect of the present invention has a plurality of information recording layers for recording information, and a unique information recording area for preferentially recording the unique information unique to the disc.
  • the specific information includes interlayer distance information for specifying a distance between each information recording layer of the multilayer optical disk.
  • the disc-specific unique information includes the inter-layer distance information for specifying the distance between each information recording layer of the multilayer optical disc. It is possible to greatly relax the restrictions. That is, for example, by determining only the upper limit value of the interlayer distance, it is possible to ensure a high degree of arbitraryness of the interlayer distance value, and freedom in determining the interlayer distance value given to each manufacturer. As a result, the effort required to converge variations caused by the manufacturing process and the effort to converge the design value of the interlayer distance within a certain range can be omitted. It is possible to ensure stability against differences in interlayer distance due to discrepancy in interlayer distance and variations in interlayer distance due to disk manufacturing problems.
  • An optical disc apparatus records information on a multilayer optical disc having a plurality of information recording layers for recording information and information from Z or the multilayer optical disc.
  • the multilayer optical disc is prerecorded with interlayer distance information for specifying the distance between each information recording layer, and the interlayer distance information is recorded from the multilayer optical disk.
  • a moving distance calculation unit for calculating a moving distance from the information recording layer to the next information recording layer to be reproduced, and the reproducing unit according to the moving distance calculated by the moving distance calculation unit.
  • a control unit for controlling the operation.
  • the multilayer optical disc preliminarily records the interlayer distance information for specifying the distance between the information recording layers, and the reproducing unit records the inter-layer distance information from the multilayer optical disc. Is played. Then, the moving distance calculation unit calculates the moving distance from the currently reproduced information recording layer to the next reproduced information recording layer based on the reproduced interlayer distance information. Thereafter, the operation of the reproduction unit is controlled by the control unit according to the calculated movement distance.
  • the interlayer distance information pre-recorded on the multilayer optical disc is reproduced and based on the reproduced interlayer distance information! Play now! /,
  • the movement distance from the information recording layer to the next information recording layer to be reproduced is calculated, and the operation of the reproduction unit is controlled according to the calculated movement distance. It is possible to improve the operating speed of the playback unit without having to detect the.
  • the interlayer distance information is recorded in advance on the multilayer optical disc, the information is stored in the optical disc apparatus without using a special additional function by using the normal reproduction function of the optical disc apparatus. Can be captured.
  • FIG. 1 is a view of a multilayer optical disc as viewed from above, and Fig. 1 (B) is a diagram showing a cross section of the multilayer optical disc.
  • FIG. 2 is a block diagram showing a configuration of an optical disc apparatus in the present embodiment.
  • FIG. 3 is a block diagram showing a configuration of an interlayer movement distance calculation unit included in the optical disc apparatus in the present embodiment.
  • FIG. 4 is a block diagram showing a configuration of an interlayer focus jump pulse generation circuit included in the optical disc apparatus in the present embodiment.
  • FIG. 5 is a diagram showing a waveform of an interlayer focus jump pulse in the present embodiment.
  • FIG. 6 is a block diagram showing a configuration of a spherical aberration correction device included in the optical disk device in the present embodiment.
  • FIG. 1 is a diagram showing a multilayer optical disc in the present embodiment.
  • FIG. 1 (A) is a view of the multilayer optical disc as viewed from above
  • FIG. 1 (B) is a diagram showing a cross section of the multilayer optical disc.
  • a control track area 52 an area between two circles indicated by a one-dot chain line in the figure
  • a main information recording area an oblique line in the figure
  • a BCA (Burst Cutting Area) region 53 (a region between two circles indicated by a broken line in the figure) is set in the inner annular portion.
  • control track area 52 and the BCA (Burst Cutting Area) area 53 are areas for pre-recording specific information unique to the multilayer optical disc, and the control track area 52 is a general track. Specifically, it is formed at the time of mastering, which is a manufacturing process of an optical disc, and cannot be altered after manufacturing. However, it is also possible to newly define a part of the recordable / reproducible area of the multilayer optical disc as a control track area.
  • the BCA (Burst Cutting Area) area 53 has already been defined by BD, etc., and is an area in which different information can be recorded on a multi-layer optical disc. is there.
  • the unique information includes interlayer distance information for specifying the distance between each information recording layer of the multilayer optical disc.
  • interlayer distance information for specifying the distance between each information recording layer of the multilayer optical disc.
  • the control track area 52 or the BCA (Burst Cut Area) area 53 interlayer distance information relating to the distance between the respective layers 57, 58,... Of the multilayer optical disc is recorded.
  • FIG. 2 is a block diagram showing a configuration of the optical disc apparatus according to the present embodiment.
  • the optical disk device in FIG. 2 includes an optical head 4, a focus servo circuit 5, a tracking servo circuit 6, a reproduction processing circuit 11, and an interlayer movement distance calculation unit 13.
  • the contents of the multilayer optical disc 1 in the present embodiment have been clarified as the explanation of FIG.
  • interlayer distance information is pre-recorded in the control track area 2 shown in the multilayer optical disc 1.
  • control track area 2 may be recorded on any one of the plurality of recording / reproducing surfaces of the multilayer optical disc 1 or recorded on the plurality of recording / reproducing surfaces. May be.
  • the light beam 3 is controlled by the optical head 4. If FIG. 2 shows the situation at the time of reproduction of the control track area 2 of the multilayer optical disc 1 described above, the information of the control track area 2 is optically included in the light beam 3.
  • the optical head 4 irradiates the multilayer optical disc 1 with the light beam 3 and receives the reflected light from the multilayer optical disc 1, thereby outputting a focus error signal 7 to the focus servo circuit 5 as well as a reproduction signal 10. Output to playback processing circuit 11.
  • the optical head 4 also moves the objective lens that converges the light beam 3 onto a predetermined information recording layer of the multilayer optical disk 1 in the optical axis direction, and changes the focus position of the objective lens 401. Is provided.
  • the focus servo circuit 5 receives a focus error signal 7 from the optical head 4, performs a predetermined process, outputs it as a focus actuator drive signal 8, and a focus mounted in the optical head 4. Actuator 401 is driven and controlled. This completes the focus servo.
  • the interlayer focus jump operation is executed in association with the focus servo. Therefore, the interlayer focus jump pulse generation circuit 9 is illustrated so as to be included in the focus servo circuit 5 as shown in FIG.
  • the reproduction signal 10 generated by the optical head 4 is supplied to the reproduction processing circuit 11.
  • the reproduction processing circuit 11 includes a function of extracting interlayer distance information 12 from the reproduction signal 10. Further, the interlayer distance information 12 extracted by the reproduction processing circuit 11 is supplied to the interlayer movement distance calculation unit 13.
  • the interlayer movement distance calculation unit 13 calculates a desired interlayer movement distance during the interlayer focus jump operation. That is, based on the interlayer distance information 12 output from the reproduction processing circuit 11, the interlayer movement distance calculation unit 13 calculates the movement distance from the information recording layer currently reproduced to the information recording layer to be reproduced next. .
  • the interlayer movement distance information 14 representing this movement distance is supplied and set to the interlayer focus jump pulse generation circuit 9 provided in the focus servo circuit 5.
  • the reproduction processing circuit 11 and the interlayer movement distance calculation unit 13 are shown as components having separate functions. However, in this embodiment, the reproduction processing circuit 11 and the interlayer movement distance calculation are calculated. It can also be considered that the two elements with the section 13 constitute a reproduction processing section.
  • the interlayer distance information is read when the optical disk device in which the multilayer optical disk 1 is inserted is started up. That is, when the multilayer optical disc 1 is inserted, the optical disc apparatus reads the unique information from the multilayer optical disc 1 and extracts the interlayer distance information included in this unique information.
  • FIG. 3 is a block diagram showing a configuration of an interlayer movement distance calculation unit included in the optical disc apparatus according to the present embodiment.
  • the interlayer movement distance calculation unit 13 mainly includes a memory 20 and a CPU 23.
  • the memory 20 stores an interlayer number for specifying an interlayer and an interlayer distance corresponding to the interlayer number.
  • the address 21 of the memory 20 corresponds to the interlayer number of the multilayer optical disc 1, and the interlayer distance of the multilayer optical disc 1 is stored in the data portion 22 of the memory 20 as interlayer distance data.
  • “n, n + l, n + 2, ••” at address 21 indicates the interlayer number of multilayer optical disc 1, and “a, b, c,. Represents the distance.
  • the CPU 23 appropriately reads the necessary interlayer distance data from the memory 20, executes necessary calculation processing, and supplies the execution result to the interlayer focus jump pulse generation circuit 9 shown in FIG. 2 as interlayer movement distance information 14. And set.
  • FIG. 4 is a block diagram showing a configuration of an interlayer focus jump pulse generation circuit included in the optical disc apparatus according to the present embodiment.
  • the interlayer focus jump pulse generation circuit 9 includes an acceleration pulse level setter 32, a deceleration pulse level setter 33, an acceleration pulse generator 34, a deceleration pulse generator 35, and an adder 38.
  • the output level of the acceleration pulse level setter 32 and the deceleration pulse level setter 33 changes depending on the value of the interlayer movement distance information 14, and the respective output levels are the acceleration pulse generator 34 and the deceleration pulse generator 34. Input to the pulse generator 35.
  • the acceleration pulse generator 34 has a predetermined pulse width and outputs an acceleration pulse 36 corresponding to the output level of the acceleration pulse generator 34.
  • the deceleration pulse generator 35 has a predetermined pulse width and outputs a deceleration pulse 37 corresponding to the output level of the deceleration pulse generator 35.
  • the adder 38 adds the acceleration pulse 36 and the deceleration pulse 37 to generate an interlayer force jump pulse 39.
  • the interlayer force jump pulse 39 is added to the force control signal generated in the focus servo circuit 5 shown in FIG. 2, and the focus actuator drive signal 8 of the optical head 4 is added. It is supplied to the force actuator 401.
  • the optical head 4 drives and controls the focus actuator 401 based on the focus actuator drive signal 8. This completes the interlayer focus jump.
  • the waveform of the generated interlayer focus jump pulse 39 is as shown in FIG.
  • FIG. 5 is a diagram showing a waveform of an interlayer focus jump pulse in the present embodiment.
  • the acceleration pulse amplitude 40 changes according to the output level of the acceleration pulse level setting device 32
  • the deceleration pulse amplitude 41 changes according to the output level of the deceleration pulse level setting device 33.
  • the interlayer focus jump pulse 39 changes according to the value of the interlayer movement distance information 14.
  • acceleration pulse level setter 32 and the deceleration pulse level setter 33 need to be configured so that the output level thereof changes according to the value of the interlayer movement distance information 14, which includes a DA converter and It can be easily realized by a combination of operational amplifiers.
  • the acceleration pulse level setting device 32 and the deceleration pulse level setting device 33 may be configured to obtain different output levels with respect to the value of one interlayer movement distance information 14. Is possible.
  • the configuration of the interlayer focus jump noise generation circuit 9 shown in FIG. 4 includes an acceleration pulse level setting unit 32 and a deceleration pulse level setting whose output level changes according to the value of the interlayer movement distance information 14. Except for the fact that the device 33 is a component, it is the same as the track jump pulse generation circuit in the tracking control of a general optical disk device, and there is no special difficulty in its realization.
  • the optical head 4 and the reproduction processing circuit 11 correspond to an example of a reproduction unit
  • the interlayer movement distance calculation unit 13 corresponds to an example of a movement distance calculation unit
  • a focus servo circuit 5 corresponds to an example of a control unit
  • the focus actuator 401 corresponds to an example of a lens actuator.
  • the operation thereof, particularly, the interlayer focus jump operation is as follows.
  • the optical disc apparatus is reproducing an arbitrary recording / reproducing surface.
  • the memory 20 shown in FIG. 3 (details of the interlayer movement distance calculation unit 13 shown in FIG. 2) is stored in the memory 20.
  • the interlayer distance information 12 of the multilayer optical disk 1 shown in FIG. 2 is stored as interlayer distance data.
  • the CPU 23 shown in FIG. 3 calculates the interlayer movement distance to the desired recording / reproducing surface as the jump destination of the recording / reproducing surface force currently being reproduced.
  • the necessary interlayer distance data is read from the memory 20, and the calculation for calculating the distance between the layers is executed.
  • the current recording / reproducing surface force is the number of interlayer numbers n, n + 1, n + 2 associated with the address 21 of the memory 20 shown in FIG. 3 until the desired recording / reproducing surface as the jump destination.
  • the current recording / reproducing surface force is the number of interlayer numbers n, n + 1, n + 2 associated with the address 21 of the memory 20 shown in FIG. 3 until the desired recording / reproducing surface as the jump destination.
  • the CPU 23 reads the interlayer distances a, b and c from the data part 22 of the memory 20 and executes an addition operation to calculate a + b + c.
  • the value of a + b + c becomes interlayer movement distance information 14, and the acceleration pulse level setting device 32 and deceleration pulse level setting device 33 shown in FIG. 4 (details of the interlayer focus jump pulse generation circuit 9 shown in FIG. 2) 33 Set to.
  • the interlayer focus jump pulse 39 as shown in FIG.
  • the levels of the acceleration pulse amplitude 40 and the deceleration pulse amplitude 41 correspond to the added value a + b + c of the interlayer movement distance information 14 described above.
  • this interlayer focus jump pulse 39 is added to the focus control signal and supplied to the focus actuator 401 mounted in the optical head 4 as the focus actuator drive signal 8 shown in FIG. . In this way, a desired interlayer focus jump operation is completed.
  • the multilayer optical disc 1 in the present embodiment preferably has four or more information recording layers.
  • the interlayer focus jump by the optical disc device in the present embodiment has been described.
  • the fact that the interlayer distance can be known by force is included in the optical disc device including a spherical aberration correction device. Assuming that It can be configured as shown in FIG.
  • FIG. 6 is a block diagram showing a configuration of a spherical aberration correction device included in the optical disc device according to the present embodiment.
  • the spherical aberration correction apparatus includes an interlayer movement distance-to-voltage converter 60, an adder 62, a spherical aberration correction element 64, and a reference voltage generator 67.
  • the interlayer movement distance information 14 represents the absolute interlayer distance between the reference recording / reproducing surface and the desired recording / reproducing surface as described above.
  • the pressure transducer 60 generates a voltage corresponding to the interlayer movement distance information 14.
  • the reference voltage generator 67 generates a reference voltage to be applied to the spherical aberration correction element 64 so that spherical aberration is corrected when a light beam is irradiated onto the reference information recording layer.
  • the adder 62 adds the output voltage level of the inter-layer movement distance versus voltage change 60 and the reference voltage 61, and sets the operation voltage 63 in the spherical aberration correction element 64 such as a liquid crystal. Therefore, if the inter-layer movement distance vs. voltage change 60 and its output voltage level are appropriately related, the output light 66 is directed to the desired recording / reproducing surface as described above, compared to the input light 65 to the spherical aberration correction element 64. A light beam with spherical aberration corrected so as to be suitable is obtained, and the spherical aberration correction operation for the desired recording / reproducing surface is completed immediately. The output light 66 is applied to the desired recording / reproducing surface, and recording / reproducing operation is performed.
  • the reference voltage 61 corresponds to the operating voltage of the spherical aberration correction element 64 for correcting the spherical aberration so as to be adapted to the reference recording / reproducing surface.
  • the inter-layer movement distance information 14 is calculated by the absolute distance of the standard recording / reproducing surface force as described above.
  • the spherical aberration correction element 64 shown in FIG. 6 is generally mounted inside the optical head 4 shown in FIG. 2, and in practice, a predetermined optical element is provided around it. Although it is necessary to provide it, its description and explanation are omitted in FIG.
  • the spherical aberration correction element 64 such as a liquid crystal is used as a member for correcting the spherical aberration.
  • the present invention is not particularly limited to this, for example, a relay lens or the like.
  • the spherical aberration may be corrected by driving the optical member.
  • the spherical aberration correction element 64 corresponds to an example of a spherical aberration correction unit
  • the reference voltage generator 67 corresponds to an example of a reference voltage generation unit
  • the voltage converter 60 corresponds to an example of a voltage generation unit
  • the reference voltage generator 67, the interlayer movement distance to voltage converter 60, and the adder 62 correspond to an example of a control unit.
  • the multilayer optical disc is preliminarily recorded in the interlayer distance information force S control track area, and the interlayer jump pulse governing the interlayer focus jump operation.
  • the acceleration and deceleration pulse amplitudes are determined based on the interlayer distance information. Therefore, the amplitude of the acceleration pulse and the deceleration pulse becomes a level suitable for the interlayer movement distance, and it is possible to easily realize the interlayer force jump operation between any recording and reproducing surfaces.
  • the spherical aberration correction amount suitable for the desired recording / reproducing surface is obtained based on the interlayer distance information of the multilayer optical disc, so that a spherical aberration detector is required.
  • the spherical aberration correction operation can be easily and quickly realized.
  • control track area described above is generally formed at the time of mastering, which is an optical disk manufacturing process, as described in the description of the multilayer optical disk in the present embodiment in FIG. Modification is not possible. Therefore, when interlayer distance information is recorded in advance in such a control track area, the interlayer distance information can be regarded as a design value of the multilayer optical disk.
  • the interlayer distance of the completed multilayer optical disc is measured, and By recording the data as interlayer distance information in the new control track area of the multilayer optical disk or in the BCA (Burst Cutting Area) area, different interlayer distance information is recorded in advance for each multilayer optical disk. It will be possible. Therefore, even if the interlayer distance of the completed multilayer optical disc varies, the effect of the present invention is not lost.
  • interlayer distance information is recorded at a predetermined position of a predetermined information recording layer.
  • the interlayer distance information is recorded at a predetermined position in the recording / reproducing area of the information recording layer closest to the objective lens of the optical head, that is, the optical head.
  • the optical disc apparatus is placed at a predetermined position on a predetermined information recording layer. Access and read interlayer distance information.
  • interlayer distance information is recorded in advance in the control track area of the multilayer optical disc, and the interlayer distance information is also read out by the control track area force.
  • Interlayer distance information may be recorded in the BCA area of a multilayer optical disc.
  • the interlayer distance information includes a measured value of the interlayer distance of the multilayer optical disk measured by a predetermined method, and is recorded in the measured value force CA area after the measurement.
  • the reproduced signal 10 shown in FIG. 2 is generally different in format from the reproduced signal from the BCA area. Therefore, the reproduction processing circuit 11 in this case is adapted to the reproduction signal from the BCA area.
  • an information recording area for recording information is set on the outer periphery of a multi-layer optical disc, a BCA area is set in the inner annular portion, and interlayer distance information is recorded in the BCA area in a barcode pattern. .
  • all the distances (interlayer distances) between the information recording layers are recorded in the control track area or the BCA area.
  • the present invention is not particularly limited to this, Instead of recording the interlayer distance in the control track area of one information recording layer, all the interlayer distances may be divided into a plurality of pieces, and each divided interlayer distance may be recorded in a plurality of information recording layers.
  • the distance information from the first layer to the fifth layer is recorded in the control track area of the first information recording layer, and the sixth to tenth layers are recorded.
  • the distance information between layers may be recorded in the control track area of information recording layers other than the first layer.
  • the multilayer optical disc includes a plurality of information recording layers for recording information, and a unique information recording area for preferentially recording the unique information unique to the disc.
  • the specific information includes interlayer distance information for specifying a distance between each information recording layer of the multilayer optical disk.
  • the disc-specific unique information includes the inter-layer distance information for specifying the distance between the information recording layers of the multilayer optical disc. It is possible to greatly relax the restrictions. That is, for example, by determining only the upper limit value of the interlayer distance, it is possible to ensure a high degree of arbitraryness of the interlayer distance value, and freedom in determining the interlayer distance value given to each manufacturer. As a result, the effort required to converge the variation caused by the manufacturing process and the effort to converge the design value of the interlayer distance within a certain range can be omitted.
  • the unique information recording area preferably includes a control track area. According to this configuration, since the unique information recording area includes the control track area, the interlayer distance information can be recorded in the control track area at the time of manufacturing the multilayer optical disc, resulting from the manufacturing process. It is possible to omit the effort required to converge the variation and the effort to converge the design value of the interlayer distance within a certain range.
  • the unique information recording area includes a burst cutting area.
  • the unique information recording area includes the burst 'cutting area! /.
  • the interlayer distance information can be recorded in the burst' cutting 'area after the multilayer optical disc is manufactured.
  • the interlayer distance information includes a measured value of the interlayer distance of the multilayer optical disc measured by a predetermined method, and after the measurement, the measured value is stored in the burst cutting area. Preferred to be recorded.
  • the interlayer distance information includes the measured value of the interlayer distance of the multilayer optical disc measured by a predetermined method, and the measured value is recorded in the burst 'cutting' area after the measurement. Interlayer distance information corresponding to each multilayer optical disk can be recorded, and more accurate interlayer distance information can be recorded on the multilayer optical disk.
  • An optical disc apparatus records information on a multilayer optical disc having a plurality of information recording layers for recording information and information from Z or the multilayer optical disc.
  • the multilayer optical disc is prerecorded with interlayer distance information for specifying the distance between each information recording layer, and the interlayer distance information is recorded from the multilayer optical disk.
  • a moving distance calculation unit for calculating a moving distance from the information recording layer to the next information recording layer to be reproduced, and the reproducing unit according to the moving distance calculated by the moving distance calculation unit.
  • a control unit for controlling the operation.
  • the multilayer optical disc pre-records the interlayer distance information for specifying the distance between each information recording layer, and the reproducing unit reproduces the inter-layer distance information from the multilayer optical disc. Is played. Then, the moving distance calculation unit calculates the moving distance from the currently reproduced information recording layer to the next reproduced information recording layer based on the reproduced interlayer distance information. Thereafter, the operation of the reproduction unit is controlled by the control unit according to the calculated movement distance.
  • the interlayer distance information pre-recorded on the multilayer optical disc is reproduced and based on the reproduced interlayer distance information! Play now! /,
  • the movement distance from the information recording layer to the next information recording layer to be reproduced is calculated, and the operation of the reproduction unit is controlled according to the calculated movement distance. It is possible to improve the operating speed of the playback unit without having to detect the.
  • the interlayer distance information is recorded in advance on the multilayer optical disc, the information is stored in the optical disc apparatus without using a dedicated additional function by using the normal playback function of the optical disc apparatus. Can be captured.
  • the inter-layer distance information is represented by 8 bits, the number of bits of the inter-layer distance information is 56 bits in an 8-layer optical disc. Therefore, even if a relatively slow transfer rate of 10 Mbps is assumed, the time required to capture all interlayer distance information is 5.6 sec. Therefore, the time required to capture the distance between all layers is completed in a time equivalent to 400 msec, which is the average access time of the optical disk device.
  • the time required to detect the inter-layer distance of a multi-layer optical disk with an eight-layer structure using the conventional method that sequentially detects the interlayer distance as described above across two layers is 1400 msec. Compared to the conventional method, The time required to acquire interlayer distance information can be significantly reduced.
  • the interlayer distance information is preliminarily recorded in the control track area of the multilayer optical disc in the optical disc apparatus described above. According to this configuration, since the interlayer distance information is preferentially recorded in the control track area of the multilayer optical disk, the control track area force interlayer distance information of the multilayer optical disk can be reproduced.
  • the interlayer distance information is preliminarily recorded in a burst cutting area of the multilayer optical disc. According to this configuration, since the interlayer distance information is recorded in advance in the burst “cutting area” of the multilayer optical disc, the burst “cutting” area force interlayer distance information of the multilayer optical disc can be reproduced.
  • the reproducing unit includes a lens actuator that drives a lens that converges light on a predetermined information recording layer of the multilayer optical disc
  • the control unit includes: The focus jump operation of the lens actuator is preferably controlled according to the movement distance calculated by the movement distance calculation unit.
  • the lens actuator drives the lens for converging light to a predetermined information recording layer of the multilayer optical disc
  • the focus jump operation of the lens actuator is the movement distance calculation unit. It is controlled according to the movement distance calculated by. Therefore, during the force jump operation for moving from the information recording layer currently being reproduced to the information recording layer to be reproduced next, the lens moving distance for converging the light to a predetermined information recording layer of the multilayer optical disk is reduced. It becomes possible to know in advance, and a focus jump operation between arbitrary information recording layers can be easily realized without the need for adding an interlayer distance detection unit or the like as described above.
  • the control unit performs acceleration for generating an acceleration pulse.
  • a pulse generator an acceleration pulse level setter that sets an output level of the acceleration pulse according to the moving distance calculated by the moving distance calculation unit, a deceleration pulse generator that generates a deceleration pulse, A deceleration pulse level setter for setting an output level of the deceleration pulse according to the movement distance calculated by the movement distance calculation unit; an acceleration pulse generated by the acceleration pulse generator; and the deceleration pulse generator And an adder for adding the deceleration pulse generated by the above.
  • the output level of the acceleration pulse is set according to the movement distance calculated by the movement distance calculation unit, and the acceleration pulse with the output level set is generated. Also, the output level of the deceleration pulse is set according to the movement distance calculated by the movement distance calculation unit, and the deceleration pulse with the output level set is generated. The generated acceleration pulse and the generated deceleration pulse are added and output as a focus jump pulse.
  • the reproducing unit includes a spherical aberration correcting unit that corrects a spherical aberration of a lens for converging light on the information recording layer of the multilayer optical disc, and the control unit It is preferable that the operation of the spherical aberration correction unit is controlled according to the movement distance calculated by the movement distance calculation unit.
  • the spherical aberration correction unit corrects the spherical aberration of the lens that converges the light on the information recording layer of the multilayer optical disc, and the operation of the spherical aberration correction unit is calculated by the movement distance calculation unit. It is controlled according to the travel distance. Therefore, at the time of spherical aberration correction for correcting the spherical aberration of the lens for converging light on the information recording layer of the multilayer optical disc, it becomes possible to always know the amount of spherical aberration correction necessary for the next information recording layer to be reproduced.
  • the operating point of the spherical aberration correcting unit can be immediately set to a set value suitable for the target information recording layer, and the spherical aberration correcting operation can be performed easily and quickly.
  • control unit applies a reference to the spherical aberration correction unit so that the spherical aberration is corrected when light is irradiated to the reference information recording layer.
  • a reference voltage generation unit that generates a voltage; a voltage generation unit that generates a voltage according to the movement distance calculated by the movement distance calculation unit; the reference voltage generated by the reference voltage generation unit; U, which preferably includes an adder that adds the voltage generated by the voltage generator.
  • the reference voltage to be applied to the spherical aberration correction unit is generated by the reference voltage generation unit so that the spherical aberration is corrected when the reference information recording layer is irradiated with light.
  • the unit generates a voltage according to the movement distance calculated by the movement distance calculation unit.
  • the adder adds the reference voltage generated by the reference voltage generation unit and the voltage generated by the voltage generation unit and applies them to the spherical aberration correction unit. Therefore, it is necessary for the desired information recording layer based on the total distance between the desired information recording layer and the reference information recording layer, that is, the spherical aberration correction amount required for the reference information recording layer.
  • the spherical aberration correction amount can be easily known, and the spherical aberration correction operation can be performed easily and quickly.
  • the multilayer optical disk and the optical disk apparatus that are effective in the present invention can ensure stability against the difference in the interlayer distance of each multilayer optical disk or the variation in the interlayer distance due to the manufacturing problem of the disk. It is useful as an optical disk device such as a multi-layer optical disk having a multi-layer structure and a large-capacity optical disk drive and an optical disk recorder for recording information on a multilayer optical disk and reproducing information on a Z or multilayer optical disk.

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Optical Head (AREA)

Abstract

La présente invention garantit une stabilité contre les différences de distance d'une couche à une autre dans chaque disque optique multicouche et des fluctuations de distance d'une couche à une autre causées par des problèmes lors de la fabrication des disques. Un disque optique multicouche préenregistre des informations sur la distance d'une couche à une autre afin de spécifier chacune des distances entre les couches d'enregistrement d'informations. Un circuit de traitement de reproduction reproduit les informations sur la distance d'une couche à une autre à partir du disque optique multicouche. Une unité de calcul de la distance de déplacement d'une couche à une autre calcule la distance de déplacement d'une couche d'enregistrement d'informations actuellement reproduites à une couche d'enregistrement d'informations à reproduire successivement, selon les informations sur la distance d'une couche à une autre reproduites par le circuit de traitement de reproduction. Un circuit à servomécanisme de focalisation commande le fonctionnement de la tête optique selon la distance de déplacement calculée par l'unité de calcul de la distance de déplacement d'une couche à une autre.
PCT/JP2006/321145 2005-10-27 2006-10-24 Disque optique multicouche et appareil a disque optique WO2007049605A1 (fr)

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WO2008078407A1 (fr) * 2006-12-26 2008-07-03 Tdk Corporation Support d'enregistrement optique et procédé pour enregistrer et reproduire des informations sur un support d'enregistrement optique et depuis celui-ci.
US7983120B2 (en) 2006-01-26 2011-07-19 Hitachi-Lg Data Storage, Inc. Optical disk apparatus, focus control method and optical disk
US9508378B2 (en) 2012-11-07 2016-11-29 Samsung Electronics Co., Ltd. Optical disk and optical disk reproduction device for reproducing same

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WO2010106755A1 (fr) * 2009-03-17 2010-09-23 パナソニック株式会社 Dispositif de disque optique, procédé de commande de focalisation et circuit intégré
US8139462B1 (en) * 2010-11-24 2012-03-20 General Electric Company System and method for precise recording

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JP2000200429A (ja) * 1996-09-27 2000-07-18 Sanyo Electric Co Ltd 光ディスク装置
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JP2000315323A (ja) * 1999-05-06 2000-11-14 Sharp Corp 光記録媒体および光記録再生装置
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Publication number Priority date Publication date Assignee Title
US7983120B2 (en) 2006-01-26 2011-07-19 Hitachi-Lg Data Storage, Inc. Optical disk apparatus, focus control method and optical disk
WO2008078407A1 (fr) * 2006-12-26 2008-07-03 Tdk Corporation Support d'enregistrement optique et procédé pour enregistrer et reproduire des informations sur un support d'enregistrement optique et depuis celui-ci.
US8355308B2 (en) 2006-12-26 2013-01-15 Tdk Corporation Optical recording medium and recording and reading method of optical recording medium
US9508378B2 (en) 2012-11-07 2016-11-29 Samsung Electronics Co., Ltd. Optical disk and optical disk reproduction device for reproducing same
EP2919233A4 (fr) * 2012-11-07 2016-11-30 Samsung Electronics Co Ltd Disque optique et dispositif de reproduction de disque optique pour sa reproduction

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