WO2007099835A1 - 多層情報記録媒体、情報記録再生装置及び多層情報記録媒体の製造方法 - Google Patents
多層情報記録媒体、情報記録再生装置及び多層情報記録媒体の製造方法 Download PDFInfo
- Publication number
- WO2007099835A1 WO2007099835A1 PCT/JP2007/053213 JP2007053213W WO2007099835A1 WO 2007099835 A1 WO2007099835 A1 WO 2007099835A1 JP 2007053213 W JP2007053213 W JP 2007053213W WO 2007099835 A1 WO2007099835 A1 WO 2007099835A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- information
- recording medium
- multilayer
- information recording
- medium
- Prior art date
Links
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
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
- G11B7/00736—Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information
-
- 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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1392—Means for controlling the beam wavefront, e.g. for correction of aberration
- G11B7/13925—Means for controlling the beam wavefront, e.g. for correction of aberration active, e.g. controlled by electrical or mechanical means
-
- 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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
Definitions
- the present invention relates to a multilayer information recording medium having a plurality of stacked information surfaces and recording or reproducing information by light, a method for manufacturing the multilayer information recording medium, and information such as digital video information in high density.
- the present invention relates to an information recording / reproducing apparatus that records information on a multilayer information recording medium and reproduces information recorded on the multilayer information recording medium.
- Optical memory technology using optical disk media with pit-like patterns as high-density 'large-capacity storage media is used for digital' versatile 'discs (DVDs), video discs, document file discs, and even data files. It has been put into practical use while expanding.
- functions required for the successful recording and playback of information on optical disc media with high reliability via a finely focused light beam with a diameter of 1 / zm or less are broadly divided into a condensing function for forming a diffraction-limited micro spot, an optical system focus control function (force servo), a tracking control function, and a pit signal (information signal) detection function.
- NA numerical aperture
- FIG. 19 is a diagram showing a configuration of a conventional optical disc apparatus shown in Patent Document 1.
- the aberration correction amount switching means 614 has a spherical aberration correction amount of 0 with a reference thickness of 100 m.
- the aberration correction amount is m ⁇ (a), the substrate thickness is thin relative to the reference thickness. 1 ⁇
- the aberration correction amount for correcting spherical aberration of the optical disk medium (b), and the substrate thickness is relative to the reference thickness.
- Three types of spherical aberration correction amounts consisting of the aberration correction amount (c) for correcting the spherical aberration of the thick optical disk medium are set in advance for each information surface of the optical disk medium on which focus control is performed.
- the convergence correction amount switching unit 614 selects and switches an appropriate spherical aberration correction amount from these aberration correction amounts in accordance with the disc discrimination signal 613 from the disc discrimination unit 612.
- the information surface is the first layer in a single-layer optical disk medium whose information surface is one layer from the laser incident side and a multi-layer optical disk medium of two or more layers.
- LO is the same in the disc thickness direction, and the distance from the cover layer surface where the laser beam is incident is the same.
- the information surface after the second information surface L1 is formed at a position closer to the cover layer surface than the first information surface LO. Therefore, in each of the single-layer optical disk medium and the multi-layer optical disk medium having two layers, three layers, or more layers, the recording layer as the first layer (for example, the recording layer of the phase change recording film) is a polycarbonate. It can be formed on a Bonate substrate in the same manner, and the manufacturing process can be made common, and the same recording / reproducing characteristics can be obtained for a single-layer optical disk medium and a multi-layer optical disk medium.
- the recording layers after the second layer are formed at positions closer to the cover layer than the first layer, and therefore the recording layers after the second layer are respectively
- the recording layer force also shortens the distance to the cover layer surface. In other words, the thickness of the cover layer is reduced by looking at each layer force. This increases the allowable tilt angle between the optical disk medium and the light beam. That is, since the tilt margin of the second and subsequent recording layers can be relaxed compared to the recording film of the first layer, it is possible to promote improved recording / reproduction characteristics, improved disk productivity, and cost reduction.
- Patent Document 3 discloses a method for ensuring that the focus is drawn into the information surface even when the level of the total reflected light amount of each information surface force is low as in a multilayer optical disk medium.
- Patent Document 4 discloses an optical recording medium having a recording surface corresponding to the BD format and a recording surface corresponding to the DVD format.
- the optical recording medium in Patent Document 4 is compatible with optical recording / reproducing devices that support different formats.
- the type of the optical disc medium is discriminated using disc discriminating means, and the spherical aberration correction corresponding to the thickness of the recording surface to be focused is controlled.
- This is a method of correcting the amount in advance by the aberration correction amount switching means.
- an optical disk medium outside the initial setting range for example, an optical disk medium having a four-layer information recording surface on one side of the laser incident surface force is inserted.
- the conventional multilayer optical disc medium described in Patent Document 2 is formed at a position where the information surface approaches the cover layer surface in the disc thickness direction in terms of the laser incident side force.
- an optical disk apparatus capable of recording and reproducing the multilayer optical disk medium at the same time as designing and developing the multilayer optical disk medium is designed and developed.
- the legacy drive that was released before all types of formats of multi-layer optical disk media were decided there was recording on the optical disk media of the old format. There are restrictions on playback.
- an optical disc medium with an information surface exceeding two layers on one side is inserted, such as a four-layer optical disc medium, the disc is correctly identified as a four-layer optical disc medium. It is impossible to do.
- the disc recorded on the four-layer optical disc medium cannot be reproduced.
- a disc with an information surface of 2 layers which was released before the format of the disc with the information surface layer was disclosed, was inserted into the optical disc device, depending on the startup procedure performed when starting the optical disc device, The four-layer optical disk medium is ejected and cannot be recorded or played back on the new-format four-layer optical disk medium.
- Patent Document 1 JP 2002-373441 A
- Patent Document 2 Japanese Patent Laid-Open No. 2003-346379
- Patent Document 3 Pamphlet of International Publication No. 02Z067250
- Patent Document 4 Japanese Unexamined Patent Publication No. 2006-236509
- the present invention has been made to solve the above problems, and can ensure backward compatibility with an information recording medium that has already been released or has a known format. It is an object of the present invention to provide a multilayer information recording medium, an information recording / reproducing apparatus, and a method for manufacturing the multilayer information recording medium, which can record / reproduce the multilayer information recording medium using the information recording / reproducing apparatus that is already widespread.
- a multilayer information recording medium is a multilayer information recording medium having a plurality of stacked information surfaces and recording or reproducing information by light, wherein the plurality of information surfaces include: At least one information surface having a first reflecting surface for reflecting the light with a predetermined first return light amount when light is incident, and a second return smaller than the first return light amount; And another information surface having a second reflecting surface that is reflected by the amount of light.
- An information recording / reproducing apparatus has a plurality of stacked information surfaces.
- An information recording / reproducing apparatus for recording or reproducing information from a multilayer recording medium, wherein the plurality of information surfaces reflect the light with a predetermined first return light amount when the light is incident.
- a laser beam irradiation unit that irradiates a signal track of a layer information recording medium with a laser beam for recording or reproducing a signal, a spherical aberration correction unit that corrects a spherical aberration of the laser beam, and the laser beam And a medium for determining the number of information surfaces by irradiating the first reflective surface of the multilayer information recording medium with laser light, and a control unit for controlling the focal position of the laser light in accordance with the information surface to be irradiated A determination unit.
- a method for producing a multilayer information recording medium is a method for producing a multilayer information recording medium having a plurality of laminated information surfaces, wherein the information surface is formed on one side of the substrate. And a second step of forming a light-transmitting intermediate layer having an information surface on the reflective layer, and a reflection on the information surface side of the intermediate layer. A fourth step of forming a translucent protective layer after forming a plurality of information surfaces by repeating the third step of forming a layer, the second step and the third step a plurality of times.
- a first reflection layer on at least one information surface for reflecting the light with a predetermined first return light amount when the light is incident, and making the light smaller than the first return light amount.
- FIG. 1 is a diagram for explaining a configuration of an optical information recording medium in the present embodiment.
- FIG. 2 is a diagram for explaining a track layout of each layer of a conventional two-layer optical disk medium.
- FIG. 3 is a schematic diagram showing a stack structure of a four-layer optical disk medium in the present embodiment.
- FIG. 4 is a diagram for explaining the track layout of each layer in the four-layer optical disk medium according to the present embodiment.
- FIG. 5 is a diagram showing the relationship between the thickness of the disc surface force on each information surface and the focus error signal when a low-reflectance region is formed and a four-layer optical disc medium is used.
- FIG. 6 is a diagram showing the relationship between the thickness of each information surface from the disc surface and the focus error signal when the four-layer optical disc medium in the present embodiment is used.
- FIG. 7 is a diagram showing an overall configuration of an optical information recording / reproducing apparatus for recording / reproducing a multilayer optical disc medium in the present embodiment.
- FIG. 8 is a first flowchart for explaining a processing procedure in the two-layer compatible optical disc apparatus.
- FIG. 9 is a second flowchart for explaining the processing procedure in the two-layer optical disc apparatus.
- FIG. 10 is a diagram for explaining the area configuration in the radial direction of the four-layer optical disk medium in the present embodiment.
- ⁇ 11 It is a diagram for explaining the area configuration in the radial direction of the eight-layer optical disc medium in the present embodiment.
- FIG. 12 is a diagram for explaining another area configuration in the radial direction of the eight-layer optical disk medium in the present embodiment.
- FIG. 13 is a diagram for explaining another area configuration in the radial direction of the four-layer optical disk medium in the present embodiment.
- FIG. 14 is a diagram for explaining still another area configuration in the radial direction of the eight-layer optical disc medium in the present embodiment.
- FIG. 15 is a cross-sectional view for explaining the method for manufacturing the substrate manufacturing die for manufacturing the multilayer optical disc medium in the present embodiment.
- FIG. 16 is a cross-sectional view of the multilayer optical disc medium in the present embodiment.
- FIG. 17 is a diagram for explaining a method of manufacturing a multilayer information recording medium in the present embodiment.
- FIG. 18 is a cross-sectional view showing the structure of the sputtering apparatus in the present embodiment.
- FIG. 19 is a diagram showing a configuration of a conventional optical disc apparatus.
- a multilayer information recording medium according to an embodiment of the present invention will be described with reference to the drawings.
- a write-once phase change optical disk medium is described as an example of a multilayer information recording medium.
- this is not intended to limit the multilayer information recording medium, and energy is injected into the multilayer information recording medium.
- Multi-layer information recording media (BD-RE or other rewritable recording media or BD-R write-once recording media) or uneven pits that record information by forming marks that have different physical properties from unrecorded parts
- This technology is common to read-only optical disc media that record information according to differences in physical shape.
- the disk structure has a track pitch of 0.32 m and a thickness force from the laser incident surface to the information surface of 25 m to 130 m.
- 2T minimum mark length
- a medium will be described as an example.
- Tw 15. 15 ns
- FIG. 1 is a diagram for explaining the configuration of the optical information recording medium in the present embodiment.
- Figure 1 shows the area structure on the plane of a multilayer optical disk medium.
- a lead-in area 1006, a data area 1001, and a lead-out area 1005 are arranged from the inner periphery side.
- the lead-in area 1006 includes a BCA (Burst Cutting Area) 1002, an initial recording area (Pre-recorded area) 1003, and a learning area and a DMA area 1004.
- FIG. 2 is a diagram for explaining the track layout of each layer of a conventional two-layer optical disk medium.
- the lead-in area is located inside the radius of the first information surface LO of approximately 24 mm.
- a BCA Burst Cutting Area
- the BCA forms recording data in a bar code form by forming the recording marks so that they are arranged concentrically.
- a radius of 22.2 to 23.1 mm is an initial recording area (Pre-recorded area).
- disk information such as recommended values of recording power and recording pulse conditions, recording linear velocity conditions, information used for copy protection, etc.
- the formed group is recorded by wobbling (prerecorded information).
- These prerecorded information are reproduction-only information that cannot be rewritten and are recorded in advance when the disc is shipped.
- the BCA and the initial recording area are playback-only areas.
- a learning area for performing test recording and a differential management area (DMA) are provided at a radius of 23.l to 24 mm.
- DMA differential management area
- the differential management area (DMA) is an area for managing the differential information on the optical disk medium.
- a data area is provided in the radius of 24.0 to 58. Omm.
- the data area is an area where data desired by the user is actually written.
- a replacement area to replace the part (sector, cluster) that cannot be recorded / reproduced, it is placed before and after the data area where user data is recorded / reproduced.
- Set ISA Inner Spare Area
- OS A Outer Spare Area
- a lead-out region is provided at a radius of 58.0 to 58.5 mm.
- the lead-out area has the same differential management area as the lead-in area. It is used as a buffer area so that it can be overrun during In the meantime, in the case of a multi-layer optical disk medium, the lead-out in the sense of the recording / playback end area may be on the inner circumference side.
- the data area (recordable area) where the phase change mark is recorded / reproduced is the radius 23. lmm, that is, from the learning area to the outer outer zone or the lead-out area.
- an area corresponding to BCA is provided on the information surface other than the first information surface LO.
- the recording of the force unique ID is not performed.
- the BCA on the first information surface LO records a barcode-like signal in the radial direction by a recording method that burns the recording layer with a high-power laser.
- BCA information such as a unique ID
- reliable recording may not be possible. Because there is sex.
- BCA recording is not performed on the second information surface L1, thereby increasing the reliability of the BCA on the first information surface LO.
- initial value information is recorded at least on the first information surface LO.
- the inner peripheral side of the first information surface LO is an inner zone
- the outer peripheral side is an outer zone.
- the address order of the first information surface LO is recorded from the inner circumference to the outer circumference, and recording / reproduction is performed from the inner circumference to the outer circumference.
- the second information surface L1 the inner periphery side cardout region is formed, and the outer periphery side is the outer zone.
- the address order of the second information surface L1 is recorded in the direction from the outer periphery to the inner periphery, and the recording reproduction is performed from the outer periphery to the inner periphery.
- the first information surface LO is directed toward the outer periphery side without the need for a full seek to the outer periphery force, and the second information surface L1 is moved toward the outer periphery side.
- Recording and reproduction can be performed sequentially from the outer circumference side toward the inner circumference side, and real-time recording at a high transfer rate such as video recording and reproduction can be performed for a long time.
- FIG. 3 is a schematic diagram showing a stack configuration of a four-layer optical disc medium having four information surfaces with laser incident side force in the present embodiment.
- the four-layer optical disk medium includes a substrate 905, a first information surface LO, a second information surface Ll, a third information surface L2, a fourth information surface L3, and a cover layer 909. Laser light is incident from the cover layer 909 side.
- the thickness of the substrate 905 is approximately 1.1 mm, and the thickness of the cover layer 909 is at least 25 m.
- Each information side is transparent
- the space layers are separated by 906-908.
- the thickness of the cover layer 909 is 60 m
- the thickness between the fourth information surface L3 and the third information surface L2 is 10 m
- the third information The thickness between the surface L2 and the second information surface L1 is 17 m
- the thickness between the second information surface L1 and the first information surface L0 is 13 / zm separated by a force space layer.
- the distance between each information surface may be between 6 ⁇ m and 30 ⁇ m in the case of a four-layer optical disk medium.
- the space between the information surfaces separated by the space layer is optimized so as to reduce interference of diffracted light from each information surface (interlayer interference), and is not limited to the above-mentioned space distance.
- FIG. 4 is a diagram for explaining the track layout of each layer of the four-layer optical disk medium according to the present embodiment.
- the first information surface LO of the four-layer optical disk medium is the information surface of a single-layer optical disk medium having one information surface or the two-layer optical disk medium having two information surfaces shown in FIG. This is the same track layout as the first information plane LO.
- the second information surface L 1 of the four-layer optical disk medium has the same track layout as the second information surface L 1 of the two-layer optical disk medium having two information surfaces shown in FIG.
- the lead-out zone on the inner circumference side of the second information surface L1 is an inner zone because it is not at the end of recording / playback in a multilayer optical disc medium having three or more information surfaces.
- the inner peripheral portions of the third information surface L2 and the fourth information surface L3 are different from the track layout of the inner peripheral portions of the first and second information surfaces LO, L1.
- the initial recording area on each information surface is arranged to be aligned at the same radial position.
- the initial recording area on the third information surface L2 is shown in FIG. As shown, it is arranged so that it does not overlap with the BCA of the first information surface LO or the radial position of the initial recording area.
- the HFM group formed by the meandering of the track corresponding to the initial recording area starts from a position having a radius of 23.1 mm, and the user data area is started 24 It is formed between the position of Omm.
- a learning area and a DMA area are arranged outside the initial recording area.
- the learning area and the DMA area are arranged outside the position of the radius of 23.1 mm.
- BCA is not recorded on the information surface other than the first information surface LO.
- the initial recording area is provided on the first information surface LO and at least one of the third information surface L2 and the fourth information surface L3, and the total recording medium has a total of at least two surfaces.
- Disc management information is recorded.
- information such as the recording power, recording pulse conditions, disc version and layer number of the first information surface LO and the second information surface L1 is recorded.
- Disk management information of the third information plane L2 and the fourth information plane L3 is recorded in a predetermined area in the management area that has not been used as a reserved area in the past.
- information such as recording power and recording pulse conditions relating to at least the third information surface L2 and the fourth information surface L3 is recorded on the third information surface L2.
- information such as the recording power and the recording pulse condition relating to the first information plane LO and the second information plane L1 recorded on the conventional double-layer optical disc medium is omitted.
- Information space L2 recording space can be saved.
- flag information indicating whether or not recording to the user data area of the third information surface L2 and the fourth information surface L3 is possible.
- the flag information is in a state in which recording on the third information plane L2 and the fourth information plane L3 is not possible, data cannot be recorded on the third information plane L2 and the fourth information plane L3. It is impossible to record data only on the first information plane LO and the second information plane L1.
- the flag information cannot be read by a conventional dual-layer optical disk medium compatible drive, but can be read, written, or rewritten by a four-layer optical disk device.
- the four-layer compatible optical disc apparatus can be read into a four-layer optical disc medium so that it can be read by the two-layer compatible optical disc apparatus.
- Data can be recorded.
- a four-layer optical disk device records data in the same format only on the same area as a two-layer optical disk medium on a four-layer optical disk medium. Data can be read using the device.
- the four-layer optical disc apparatus sets flag information in a state in which data recording is prohibited on the third information plane L2 and the fourth information plane L3, and data is stored in the same area as the two-layer optical disc medium. It is also possible to set the flag information in a state in which data recording is permitted on the third information surface L2 and the fourth information surface L3 and record the data on the entire four-layer optical disk medium. By doing so, the user can share one optical disk medium between the two-layer optical disk device and the four-layer optical disk device, and can freely exchange data.
- a track having a spiral groove is formed, and a groove is not formed. You can form a mirror surface. In this way, by making the initial recording area of the third information surface L2 and the fourth information surface L3 and the area corresponding to BCA mirror-like, the diffracted light due to the grooves is reduced, and the first information surface LO and It is possible to facilitate the focus pull-in to the second information surface L1.
- region 201 and region 202 are low reflectivity areas (LRA) in the inner periphery of third information surface L2 and fourth information surface L3, respectively.
- LRA low reflectivity areas
- the reflectivity in the low reflectivity region should be set to approximately 0, or designed as a condition where the reflectivity is different between the low reflectivity region and the other regions.
- the return light quantity ratio which is the ratio of the return light quantity to the laser output light
- the return light quantity ratio Rd in the low reflectance region is designed so that 0 ⁇ Rd ⁇ 3.5%.
- the return light ratio Rb in the other areas is designed so that the range of Rb is 3.5% ⁇ Rb ⁇ 8%.
- it may be designed such that the relationship between the return light amount ratio Rd in the low reflectance region and the return light amount ratio Rb in the region other than the low reflectance region is 2 XRd ⁇ Rb.
- the reflectivity from the disk surface is theoretically about 4%. Return to a reflection height level lower than, and set the light intensity ratio Rd.
- the refractive index n of this cover layer resin is approximately 1.5 ⁇ 0.1.
- the reflectance R of the cover layer resin surface force is calculated to be 3% to 5%.
- the optical system is aberration-corrected on the information surface having an incident thickness of 100 / zm as in the multilayer optical disc medium in the present embodiment
- spherical aberration corresponding to the cover layer thickness is generated on the disc surface.
- the amount of light returning from the surface is attenuated to about 70%.
- the value obtained by multiplying the surface reflectance by the attenuation of the spherical aberration is the actual amount of return of the surface force, and the surface reflectance is about 2% to 3.5%.
- the optical disk apparatus Since the value of the refractive index of the cover layer resin is determined in advance, the optical disk apparatus stores in advance that the surface reflectance is a value of about 3%. If the return light amount of the low reflectivity region power is smaller than the amplitude value of the RF signal due to the surface reflection, the possibility of erroneous detection that the reflected light is from the disk surface is reduced. Therefore, it is desired that the reflectance in the low reflectance region be smaller than the return light (surface reflection) from this surface.
- the most reliable method is to detect half of the surface S-shaped waveform at the slice level. Therefore, it is most effective to set the return light quantity ratio Rd in the low reflectance region to 1Z2 or less of the surface reflectance. In this way, by designing the return light quantity ratio Rd in the low reflectance region so that the reflected light quantity is smaller than the value stored in the information recording / reproducing apparatus, the multi-layer information can be recorded by the two-layer compatible information recording / reproducing apparatus. Recording media can be used.
- the forcing to the first information surface LO or the second information surface L1 at the time of starting the disk is performed. Force pulling can be facilitated.
- the BCA in the inner periphery of the first information surface LO is reproduced.
- the execution process of laser light focus pull-in is generally performed in the inner periphery where the BCA is located.
- the region 201 of the third information surface L2 and the region 202 of the fourth information surface L3, which are radial positions including the BCA of the first information surface LO, are the same as those of the first information surface LO and the second information surface L1.
- the reflectance is set to be lower than that in the region at one radius position, and the reflected light from the third information surface L2 and the fourth information surface L3 is reduced. As a result, it is possible to reliably perform the focus pull-in to the BCA of the first information surface LO.
- the BCA and the initial recording area on the first and second information surfaces correspond to the first reflecting surface, and the low reflection on the third and fourth information surfaces.
- the rate region corresponds to the second reflecting surface.
- the information surface is formed in the disc manufacturing process before the disc shipment.
- the laser initialization device irradiates each recording layer of the third information surface L2 and the fourth information surface L3 with a laser beam of recording power to forcibly form marks.
- the pre-recording may be performed with a recording power at which a mark is formed, for example, by lowering the irradiation power of the BCA writer only by the laser initialization device.
- the reflective layer is formed using a sputtering apparatus
- the step of pre-recording with a laser beam after the disc is manufactured or the low reflectance region is burned by burning the reflective layer.
- the forming process is unnecessary, and the conventional disk manufacturing process can be used as it is.
- the reflection of the inner peripheral portion (BCA and initial recording area) of the information surface compatible with a conventional optical disk medium for example, an optical disk medium having a two-layer structure.
- the present invention is not particularly limited to this, and the data area of the information surface other than the information surface compatible with the conventional optical disk medium is used. May be lower than the reflectance of the compatible information surface.
- the reflectance of the data area of the third information surface L2 and the fourth information surface L3 is expressed as the first information surface LO and the second information surface L3. Set lower than the reflectance of the data area of the information surface L2.
- the reflectivity of all the areas such as the inner circumference and the data area of the third information surface L2 and the fourth information surface L3 is the same as that of the first information surface LO and the second information surface L2. It may be set lower than the reflectance of the area.
- the BCA, the initial recording area, and the data area on the first and second information surfaces correspond to the first reflecting surface
- the low reflectance area and the data area on the third and fourth information surfaces correspond to the first reflecting surface.
- the second reflecting surface corresponds to the second reflecting surface.
- FIG. 5 is a diagram showing the relationship between the thickness of each information surface from the disc surface and the focus error signal when a low-reflectance region is formed and a V-type four-layer optical disc medium is used.
- a straight line 41 in FIG. 5 shows that the focusing point of the laser beam gradually moves toward the information surface on the back side as the left force on the paper moves to the right.
- an S-shaped waveform 42 as shown in FIG. 5 appears in the focus error signal according to the reflection surface (information surface) of the optical disk medium.
- the S-shaped waveform on the disc surface is optimized to the first information surface LO by the spherical aberration correction unit, the S-shaped waveform on the disc surface, the S-shaped waveform on the fourth information surface L3, and the third information surface L2
- the amplitude of the S-shaped waveform gradually increases in the order of the S-shaped waveform, the S-shaped waveform of the second information surface L1, and the S-shaped waveform of the first information surface LO.
- These five S-shaped waveforms 42 appear as focus error signals. For example, if you try to perform focus pull-in on such a four-layer optical disk medium using a two-layer optical disk device that has already been released, more S-shaped signals will be detected than expected. It is difficult to accurately perform the focus pull-in to the desired information surface. Therefore, in the present embodiment, as described above, the low reflectance region is provided at the position where the focus error signal is detected on the third information surface L2 and the fourth information surface L3.
- FIG. 6 is a diagram showing the relationship between the thickness of the disk surface force of each information surface and the focus error signal when the four-layer optical disk medium in the present embodiment is used.
- a straight line 51 in FIG. 6 represents a change in the focal position of the laser beam spot due to the disk surface force
- an S-shaped waveform 52 in FIG. 6 represents a focus error signal.
- Straight line 51 goes from left to right on the page. This means that the condensing point of the laser beam is gradually moving toward the information surface on the back side of the disk surface force.
- an S-shaped waveform 52 as shown in FIG. 6 appears in the focus error signal according to the reflection surface (information surface) of the optical disk medium.
- the focus process can be executed as if it were a two-layer optical disk medium, and the first information surface LO can be easily accessed. Focus pull-in becomes possible and BCA can be played.
- a four-layer optical disk medium having a four-layer information surface has been described as an example of a multilayer optical disk medium.
- a multilayer optical disk medium having five or more layers having a low reflectivity region is described. What can be applied to
- the track layout of the four-layer optical disk medium including the track layout of the two-layer optical disk medium has been described as an example.
- the three-layer including the track layout of the single-layer optical disk medium is described.
- An optical disk medium may be used.
- the track layout of the first information surface LO of the three-layer optical disk medium is the same as the track layout of the single-layer optical disk medium, and the second and third information surfaces Ll and L2 of the three-layer optical disk medium are the inner periphery.
- the track layout includes a low reflectance region.
- the multilayer information recording medium may be a three-layer optical disk medium including a track layout of a two-layer optical disk medium.
- the track layout of the first and second information planes LO and L1 of the three-layer optical disk medium is the same as the track layout of the first and second information planes LO and L1 of the two-layer optical disk medium.
- the third information surface L2 of the optical disk medium has a track layout including a low reflectance region on the inner periphery.
- the multilayer information recording medium may be a double-layer optical disk medium including a track layout of a single-layer optical disk medium.
- the first and second information of the double-layer optical disk medium The track layout of the plane LO is the same as the track layout of the first information plane LO of the single-layer optical disc medium, and the second information plane L1 of the dual-layer optical disc medium includes a low-reflectance area on the inner periphery. It becomes. At this time, the reflectance of the inner periphery is lower than the reflectance of the data area where data is recorded.
- FIG. 7 is a diagram showing an example of the entire configuration of an information recording / reproducing apparatus (optical disk apparatus) for recording / reproducing a multilayer optical disk medium according to the present embodiment.
- the optical disc apparatus includes a spherical aberration correction unit 108, an optical pickup 111, a disk discrimination unit 112, a sensor 113, an FE (focus error) signal calculation unit 114, an RF signal calculation unit 115, a storage unit 116, and A control unit 117 is provided.
- the optical pickup 111 includes a diffraction element 102, collimating lenses 103 and 104, an objective lens 105, a laser light source 106, an activator 107, and photodetectors 109 and 110.
- the laser light source 106 emits a light beam.
- the light beam emitted from the laser light source 106 passes through the diffraction element 102, is converted into parallel light by the collimating lenses 103 and 104, and enters the objective lens 105.
- the objective lens 105 converges the light beam on the information recording surface of the multilayer optical disc medium 101.
- the light beam reflected by the multilayer optical disc medium 101 travels along the original optical path in the reverse direction, is collected by the collimating lenses 103 and 104, is branched by the diffraction element 102, and enters the photodetectors 109 and 110.
- a servo signal including a focus error signal and a tracking error signal and an information signal (RF signal) are generated from output signals of the photodetectors 109 and 110.
- the NA of the objective lens 105 is a large one of 0.8 or more.
- the actuator 107 performs focus control, which is position control of the objective lens 105 in the optical axis direction, and tracking control, which is position control in the direction perpendicular to the optical axis, based on signals from the control unit 117.
- the actuator 107 is configured by driving means such as a coil or a magnet.
- the FE signal calculation unit 114 generates an FE signal based on the signals from the photodetectors 109 and 110
- the RF signal calculation unit 115 generates an RF signal based on the signals from the photodetectors 109 and 110.
- the sensor 113 detects a hole in the disk cartridge and outputs a detection signal.
- the disk discrimination unit 112 includes the FE amplitude FEO and RF amplitude RFO stored in the storage unit 116, the FE amplitude FE 1 and RF amplitude RF1 generated by the FE signal calculation unit 114 and the RF signal calculation unit 115, and a sensor.
- the type of the multilayer optical disc medium 101 is discriminated using disc discriminating information obtained by combining any one or a plurality of signals from the detection signal from 113.
- the spherical aberration correction unit 108 drives the collimating lens 104 according to the type of the optical disk medium determined by the disk determination unit 112, and performs optimal spherical aberration correction according to the thickness from the surface of each information surface.
- control unit 117 sets a write prohibition flag that prohibits data recording in the user data area in units of information.
- control unit 117 prohibits data recording on the information surface in which the write prohibition flag is set.
- the laser light source 106 corresponds to an example of a laser light irradiation unit
- the spherical aberration correction unit 108 corresponds to an example of a spherical aberration correction unit
- the control unit 117 is a control unit, a flag setting unit, and a recording prohibition unit.
- the disk determination unit 112 corresponds to an example of a medium determination unit.
- FIGS. 8 and 9 are flowcharts for explaining the processing procedure in the two-layer optical disc apparatus.
- step S1 the control unit 117 determines whether or not the multilayer optical disc medium 101 is inserted into the optical disc apparatus. If it is determined that the optical disk medium is not inserted (NO in step S1), the determination process of step S1 is executed at a predetermined time interval until the optical disk medium is inserted.
- step S2 when it is determined that the multilayer optical disk medium 101 is loaded in the two-layer optical disk device and the optical disk medium is inserted (YES in step S1), in step S2, the control unit 117 performs the multilayer optical disk medium 101.
- the spherical aberration correction unit 108 is instructed to correct the spherical aberration in accordance with the first information surface L0.
- the spherical aberration correction unit 108 drives the collimating lens 104 to correct spherical aberration in accordance with the first information surface L0.
- the collimating lens 104 has a function of changing the diameter of the laser beam.
- the optical disc apparatus includes a spherical aberration correction unit 108 that moves the collimating lens 104 in the optical axis direction instead of an aberration correction element such as a liquid crystal, thereby performing the optimal spherical aberration correction for the first information surface LO.
- a method of correcting spherical aberration by providing a liquid crystal panel or the like instead of the collimating lenses 103 and 104 is also possible.
- the method eliminates the need for a liquid crystal panel, etc., and is excellent in terms of reducing the number of parts of the optical disk device, saving costs and adjusting processes, and reducing the size.
- step S3 the control unit 117 controls the laser light source 106 to irradiate the laser with the set power of the single-layer optical disc medium.
- the amount of return light from the single-layer optical disk medium is about four times as large as the return light quantity of the double-layer optical disk medium when the transmittance of the second information surface L1 is 50%. Set lower than that of single-layer optical disc media.
- the control unit 117 sets the laser power irradiated at the time of reading about 1 Z2 lower than that of the two-layer optical disk medium so that the mark recorded with the high irradiation power is not erased by mistake.
- step S4 the disc discriminating unit 112 discriminates the type of the optical disc medium and discriminates whether or not it is a single-layer optical disc medium.
- the disc discrimination unit 112 discriminates the type of the optical disc medium and discriminates whether or not it is a single-layer optical disc medium.
- the first disc type discriminating method is a discriminating method using a cartridge containing an optical disc medium.
- the sensor 113 in FIG. 7 irradiates infrared or other wavelengths of light in the cartridge direction.
- the disc discriminating unit 112 discriminates whether or not the inserted optical disc medium is in the cartridge based on the information on the reflected light power from the optical disc medium.
- the disk determination unit 112 determines the type of the optical disk medium using a sensor hole provided in the cartridge.
- the disc discriminating unit 112 discriminates whether it is a force that is a double-layer optical disc medium, a single-layer optical disc medium, a force that is a ROM optical disc medium, a force that is a rewritable optical disc medium, or a write-once optical disc medium.
- an optical disc medium is inserted into a cartridge.
- it is a method for discriminating the return light power of the optical disk medium.
- the disc discriminating unit 112 is a single-layer optical disc medium based on the signal level of the RF signal generated by the RF signal calculating unit 115 of FIG. 7 and the amplitude level of the FE signal generated by the FE signal calculating unit 114. Or a double-layer optical disc medium. Single-layer optical disc media and double-layer optical disc media are distinguished by the difference in the amount of return light from the optical disc media.
- the disc discriminating unit 112 is pre-stored in the storage unit 116, and the reference signal level of the RF signal and the reference amplitude level of the FE signal, and the return optical power of the actual optical disc medium force are generated. And the amplitude level of the FE signal and FE signal. Note that optical disk media that do not belong to any group in the initially set range, such as those with a reflected light amount of 0 or exceeding the limit, are treated as error disks as error disks.
- the third disc type discrimination method is a discriminating method using the number of S-shaped waveforms of the focus error signal. With the focus servo turned off, the S-shaped waveform as shown in Fig. 5 or Fig. 6 appears in the focus error signal by moving the focus position of the laser gradually from the disc surface in the thickness direction of the optical disc medium. .
- the disc discriminating unit 11 2 discriminates whether the disc is a single-layer optical disc medium or a double-layer optical disc medium by counting the number of the threshold amplitude of the S-shaped waveform exceeding the specified value.
- the type of the optical disk medium is determined using the amount of return light from the optical disk medium, the S-shaped waveform of the FE signal, or the signal level of the RF signal.
- the disc type of the optical disc medium can be discriminated before the focus pull-in is performed. Therefore, the recording mark already written on the optical disc medium may be erroneously erased, or the recording power may be irradiated. Therefore, it is possible to determine the type of optical disk medium that is not erroneously recorded.
- the time required for disk determination can be shortened and the startup time can be shortened. it can.
- step S4 If it is determined that the medium is a single-layer optical disk medium (Y ES in step S4), the process proceeds to step S5.
- step S5 the control unit 117 drives the actuator 107 to move the objective lens 105 so that the focus state of the laser beam is focused on the first information surface L0.
- step S6 the control unit 117 accesses the optical pickup 111 to the BCA 1002 on the inner periphery of the optical disk medium, and reads the unique ID recorded in the BCA 1002.
- step S 7 the control unit 117 causes the optical pickup 111 to access the initial recording area 1003 and read management information in the initial recording area 1003.
- step S8 the control unit 117 determines whether or not the management information in the initial recording area can be reproduced. If it is determined that the management information has been reproduced (YES in step S8), in step S9, the control unit 117 sequentially determines the learning area 1004 (test write in each information plane) according to the type of the optical disk medium. Test recording is performed using (Area), and laser power calibration and calibration of recording pulse conditions are performed. That is, in the case of a single-layer optical disk medium, the control unit 117 performs test writing in the learning area 1004 of the first information surface L0.
- step S10 the control unit 117 performs a recording or reproducing operation.
- the control unit 117 performs information recording or reproduction while performing spherical aberration correction and focus control.
- step S4 the operation when the disc discriminating unit 112 discriminates that the disc is a double-layer optical disc medium will be described. If it is determined that the medium is not a single-layer optical disk medium, that is, if it is determined that the medium is a double-layer optical disk medium (NO in step S4), the process proceeds to step S11 in FIG.
- step S11 the control unit 117 controls the laser light source 106 to irradiate the laser with the set power of the two-layer optical disk medium.
- step S12 the control unit 117 instructs the spherical aberration correction unit 108 to correct the spherical aberration in accordance with the first information surface L0 of the multilayer optical disc medium 101.
- the spherical aberration correction unit 108 corrects the spherical aberration in accordance with the first information surface L0 by driving the collimating lens 104.
- step S13 the control unit 117 drives the actuator 107 to move the objective lens 105, and changes the focus state of the laser light to the first state. Focus on information plane L1.
- step S14 The control unit 117 causes the optical pickup 111 to access the BCA 1002 on the first information surface LO, and causes the unique ID recorded in the BCA 1002 to be read.
- step S15 the control unit 117 causes the optical pickup to access the initial recording area 1003 of the first information surface LO, and causes the management information in the initial recording area 1003 to be read.
- step S16 the control unit 117 determines whether or not the management information can be reproduced from the initial recording area 1003 of the first information surface L0.
- the control unit 117 sequentially proceeds to the learning area 1004 (test write on each information plane). Perform test recording using the area) and calibrate the recording pulse conditions for laser power calibration.
- control unit 117 performs a test light in the learning area 1004 on each of the first information surface LO and the second information surface L1, and optimizes each information surface! Set the laser power.
- spherical aberration correction and focus control are performed on the information surface on which the test light is to be executed as necessary.
- step S18 the control unit 117 records information on the first information surface LO or reproduces information from the first information surface LO while performing spherical aberration correction and focus control.
- step S19 the control unit 117 performs recording of information on the second information surface L1 or reproduction of information from the second information surface L1 while performing spherical aberration correction and focus control.
- the same management information as the initial recording area of the first information surface LO is recorded in the initial recording area of the second information surface L1. Therefore, in the present embodiment, if the management information cannot be read on the first information plane LO, other information plane management information may be read! ,. That is, when it is determined that the management information cannot be reproduced from the first information surface LO (NO in step S 16), in step S 20, the control unit 117 performs the second operation on the multilayer optical disc medium 101.
- the spherical aberration correction unit 108 is instructed to correct the spherical aberration in accordance with the information surface L1.
- the spherical aberration correcting unit 108 drives the collimating lens 104 to correct spherical aberration in accordance with the second information surface L1.
- step S21 the control unit 117 drives the actuator 107 to move the objective lens 105 so that the focus state of the laser beam is focused on the second information surface L1.
- step S22 the control unit 117 causes the optical pickup 111 to access the BCA 1002 on the second information surface L1 and read the unique ID recorded in the BCA 1002.
- step S23 the control unit 117 causes the optical pickup to access the initial recording area 1003 of the second information surface L1, and causes the management information in the initial recording area 1003 to be read.
- step S24 the control unit 117 determines whether or not the management information in the initial recording area 1003 has been reproduced. If it is determined that the management information has been reproduced from the second information surface L1 (YES in step S24), the process proceeds to step SI7.
- step S25 the control unit 117 performs error notification and ends the processing. That is, when management information cannot be read from both the first information surface L0 and the second information surface L1, information cannot be recorded or reproduced on the optical disk medium. If it is determined in step S8 that the management information cannot be reproduced from the first information surface L0 (NO in step S8), the process proceeds to step S25.
- FIG. 10 is a diagram for explaining the area configuration in the radial direction of the four-layer optical disc medium corresponding to the track layout shown in FIG.
- the arrangement of the BCA, initial recording area (PR), learning area and DMA area (OPC, DMA), data area, and lead-out area is as described with reference to FIGS.
- the first information surface L0 is a single-layer optical disc medium or a two-layer optical disc.
- the area configuration is the same as the first information surface LO of the disk medium.
- the portion corresponding to the lead-out zone in the single-layer optical disk medium is the outer zone because it is not the recording / reproducing end in the four-layer optical disk medium.
- the second information surface L1 of the four-layer optical disk medium has the same area configuration as the second information surface L1 of the two-layer optical disk medium.
- the lead-out zone on the inner peripheral side of the second information surface L1 of the two-layer optical disc medium is an inner zone because it is not the end of recording / reproduction in the four-layer optical disc medium.
- a low reflectance area (LRA), an initial recording area (PR), a learning area and a DMA area (OPC, DMA) are arranged on the inner circumference, and the inner circumference is an inner zone.
- the outer peripheral side becomes the outer zone.
- the order of addresses on the third information surface L2 is recorded from the inner circumference to the outer circumference, and recording / reproduction is performed from the inner circumference to the outer circumference.
- the fourth information surface L3 has a low reflectivity area (LRA), a learning area, and a DMA area (OPC, DMA) arranged on the inner circumference, the inner circumference becomes a lead-out zone, and the outer circumference is an outer zone. It becomes.
- LRA low reflectivity area
- OPC DMA area
- the address order of the fourth information surface L3 is recorded from the outer periphery to the inner periphery, and recording / reproduction is performed from the outer periphery to the inner periphery.
- the full seek from the outer periphery to the inner periphery is not required as in the case of the two-layer optical disc medium described above, and the first information surface LO from the inner periphery to the outer periphery, the first The second information surface L1 can be recorded and reproduced sequentially from the outer periphery to the inner periphery, the third information surface L2 from the inner periphery to the outer periphery, and the fourth information surface L3 from the outer periphery to the inner periphery.
- Real-time recording at a high transfer rate can be performed for a long time.
- the address is counted up to the outer circumference on the first and third information surfaces LO and L2, and is counted up from the outer circumference to the inner circumference on the second and fourth information surfaces LI and L3.
- the In the even-numbered information plane (second and fourth information planes) by using the number of addresses of the odd-numbered information plane (first and third information planes), the in-layer address is It can be expressed by the number of bits of the address in the layer of one information surface. Further, the positional relationship of the radius with respect to the addresses of the first and second information planes L 0 and L 1 and the third and fourth information planes L 2 and L 3 can be known, and high-speed access is possible.
- FIG. 11 is a diagram for explaining the area configuration in the radial direction of the eight-layer optical disk medium according to the present embodiment.
- the first information plane LO in the eight-layer optical disk medium shown in FIG. 11 has the same area configuration as the first information plane LO described above for the single-layer optical disk medium, the two-layer optical disk medium, and the four-layer optical disk medium. is there. However, the portion corresponding to the lead-out zone in the single-layer optical disc medium is the outer zone.
- the third information surface L2 of the eight-layer optical disk medium has the same disk layout as the second information surface L1 of the two-layer optical disk medium and the second information surface L1 of the four-layer optical disk medium shown in FIG. .
- the lead-out zone on the inner side of the second information surface L1 of the two-layer optical disk medium is not the end of recording / reproduction in the eight-layer optical disk medium, and is therefore an inner zone.
- the fifth information surface L4 of the eight-layer optical disk medium has the same area configuration as the third information surface L2 of the four-layer optical disk medium shown in FIG.
- the seventh information surface L6 of the eight-layer optical disk medium has the same area configuration as the fourth information surface L3 of the four-layer optical disk medium shown in FIG. However, the portion corresponding to the lead-in area in the four-layer optical disk medium is the inner zone.
- the second, fourth, sixth, and eighth information surfaces LI, L3, L5, and L7 of the eight-layer optical disk medium are information surfaces that are newly added in the eight-layer optical disk medium.
- the second information surface L1 has a low reflectance area (LRA), an initial recording area (PR), a learning area, and a DMA area (OPC, DMA) arranged on the inner circumference, the inner circumference is an inner zone, and the outer circumference is It becomes the outer zone.
- LRA low reflectance area
- PR initial recording area
- OPC DMA area
- the address order of the second information surface L1 is recorded from the inner circumference to the outer circumference, and recording / reproduction is performed from the inner circumference to the outer circumference.
- the fourth information surface L3 has a low reflectivity area (LRA), a learning area, and a DMA area (OPC, DMA) arranged on the inner circumference, the inner circumference is the inner zone, and the outer circumference is the outer zone. Become. In this case, the address order of the fourth information surface L3 is recorded from the outer periphery to the inner periphery, and recording / reproduction is performed from the outer periphery to the inner periphery.
- LRA low reflectivity area
- OPC DMA area
- the sixth information surface L5 has a low reflectivity area (LRA), a learning area, and a DMA area (OPC, DMA) arranged on the inner circumference, the inner circumference is the inner zone, and the outer circumference is the outer zone. Become. In this case, the order of the address on the sixth information surface L5 is recorded in the direction of the outer periphery, and the recording / reproduction is performed in the direction of the outer periphery of the inner force.
- LRA low reflectivity area
- OPC DMA area
- the eighth information surface L7 has a low reflectance area (LRA), a learning area, and a DMA area (O PC, DMA), the inner circumference is the lead-out zone, and the outer circumference is the outer zone.
- LRA low reflectance area
- O PC DMA area
- the address order of the eighth information surface L7 is recorded from the outer periphery to the inner periphery, and recording / reproduction is performed from the outer periphery to the inner periphery.
- the second information surface L1 from the inner periphery to the outer periphery, the fourth information surface L3 from the outer periphery to the inner periphery, the sixth information surface L5 also has an inner peripheral force from the outer periphery, and the eighth information surface L7 from the outer periphery to the inner periphery. Recording and playback are performed sequentially. As a result, real-time recording at a high transfer rate such as video recording and reproduction can be performed for a long time.
- the internal peripheral force is counted up to the outer periphery in each of the first, second, fifth, and sixth information surfaces, and in each of the third, fourth, seventh, and eighth information surfaces, Counts up from the outer circumference to the inner circumference.
- the in-layer address can be expressed as the number of bits in the in-layer address of one layer.
- FIG. 12 is a diagram for explaining another area configuration in the radial direction of the eight-layer optical disk medium of the present embodiment.
- the first information surface L 0 has the same area configuration as the first information surface LO of the single-layer optical disk medium, the two-layer optical disk medium, and the four-layer optical disk medium.
- the portion corresponding to the lead-out zone in the single-layer optical disc medium is the outer zone.
- the third information surface L2 of the eight-layer optical disk medium is the second information surface Ll of the two-layer optical disk medium.
- the area configuration is the same as that of the second information surface LI of the four-layer optical disk medium shown in FIG.
- the lead-out zone on the inner side of the second information surface L1 of the two-layer optical disc medium is not the end of recording / playback in the eight-layer optical disc medium, and is therefore an inner zone.
- the fifth information surface L4 of the eight-layer optical disk medium has the same area configuration as the third information surface L2 of the four-layer optical disk medium shown in FIG.
- the seventh information surface L6 of the eight-layer optical disk medium has the same area configuration as the fourth information surface L3 of the four-layer optical disk medium shown in FIG.
- the portion corresponding to the lead-out area in the four-layer optical disk medium is the inner zone.
- the second, fourth, sixth, and eighth information surfaces LI, L3, L5, and L7 of the eight-layer optical disc medium are information surfaces that are newly added in the eight-layer optical disc medium.
- the second information surface L1 of the 8-layer optical disc medium has a low reflectance area (LRA), a learning area and a DMA area (OPC, DMA) arranged on the inner circumference, a lead-in zone on the inner circumference, and an outer circumference on the outer circumference. It becomes a zone.
- LRA low reflectance area
- OPC DMA area
- the address order of the second information surface L1 is recorded from the outer periphery to the inner periphery, and recording / reproduction is performed from the outer periphery to the inner periphery.
- the fourth information surface L3 of the 8-layer optical disc medium has a low reflectance area (LRA), a learning area and a DMA area (OPC, DMA) arranged on the inner circumference, the inner circumference becomes the inner zone, and the outer circumference is the outer zone. It becomes.
- LRA low reflectance area
- OPC DMA area
- the address order of the fourth information surface L3 is recorded in the direction from the inner periphery to the outer periphery, and the recording reproduction is performed in the direction of the outer periphery as well.
- the sixth information surface L5 of the eight-layer optical disc medium has a low reflectance area (LRA), a learning area and a DMA area (OPC, DMA) arranged in the inner circumference, and the inner circumference serves as an inner zone.
- the outer circumference is the outer zone.
- the address order of the sixth information surface L5 is recorded from the outer periphery to the inner periphery, and recording / reproduction is performed from the outer periphery to the inner periphery.
- the eighth information surface L7 of the 8-layer optical disc medium has a low reflectivity area (LRA), an initial recording area (PR), a learning area, and a DMA area (OPC, DMA) arranged on the inner circumference, and the inner circumference side is The inner zone is the outer zone.
- LRA low reflectivity area
- PR initial recording area
- OPC learning area
- DMA DMA area
- the address order of the eighth information surface L7 is recorded from the inner periphery to the outer periphery, and recording / reproduction is performed from the inner periphery to the outer periphery.
- Recording / reproduction is sequentially performed from the outer circumference, the inner circumference of the sixth information surface L5 to the inner circumference, and the inner circumference force of the fourth information surface L3 from the outer circumference to the inner circumference of the second information surface L1.
- the addresses are counted up from the inner periphery to the outer periphery in the first, fourth, fifth, and eighth information planes LO, L3, L4, and L7, and the second, third, sixth, and seventh addresses are counted.
- the address in the layer can be expressed by the number of bits of the address in the layer of one layer.
- FIG. 13 is a diagram for explaining an area configuration in the radial direction of a four-layer optical disk medium different from the area configuration of FIG.
- the difference from FIG. 10 is that the area configurations of the second information plane L1 and the third information plane L2 in FIG. 10 are interchanged.
- a new information plane can be inserted between the first information plane LO and the third information plane L2, which has the same area configuration as the double-layer optical disc medium, and the entire disc can be inserted.
- the total thickness between the layers can be reduced, and the disk surface can be increased.
- the address is counted up from the inner circumference to the outer circumference in the first and second information planes LO and L1, and is counted up from the outer circumference to the inner circumference in the third and fourth information planes L2 and L3. It is.
- the addresses in the layer are used. Can be represented by the number of bits in the address in the layer of one information plane.
- FIG. 14 is a diagram for explaining still another area configuration in the radial direction of the eight-layer optical disk medium in the present embodiment.
- the first information surface LO has the same disk layout as that of the single-layer optical disk medium, the double-layer optical disk medium, and the four-layer optical disk medium.
- the portion corresponding to the lead-out zone in the single-layer optical disc medium is the outer zone.
- the fifth information surface L4 has the same area configuration as the second information surface Ll of the two-layer optical disk medium and the third information surface L2 of the four-layer optical disk medium shown in FIG.
- the lead-out zone on the inner circumference side of the second information surface L1 of the two-layer optical disc medium is an inner zone because it is not the end of recording / reproduction in the eight-layer optical disc medium.
- the third information surface L2 of the 8-layer optical disk medium has the same area configuration as the second information surface L1 of the 4-layer optical disk medium shown in FIG.
- the seventh information surface L6 of the eight-layer optical disk medium has the same area configuration as the fourth information surface L3 of the four-layer optical disk medium shown in FIG. However, the part corresponding to the lead-out zone in the four-layer optical disk medium is the inner zone.
- the second, fourth, sixth, and eighth information planes LI, L3, L5, and L7 are information planes newly added on the eight-layer optical disc medium.
- the second information surface L1 has a low reflectivity area (LRA), an initial recording area (PR), a learning area, and a DMA area (OPC, DMA) on the inner circumference, the inner circumference becomes an inner zone, and the outer circumference is on the outer circumference. It becomes the outer zone.
- LRA low reflectivity area
- PR initial recording area
- OPC DMA area
- the address order of the second information surface L1 is recorded from the inner periphery to the outer periphery, and recording / reproduction is performed from the inner periphery to the outer periphery.
- a low reflectance area (LRA), a learning area, and a DMA area (OPC, DMA) are arranged on the inner circumference, and the inner circumference is an inner zone and the outer circumference is an outer zone.
- the order of the address of the fourth information plane L3 is the inner circumference. From the inner periphery to the outer periphery.
- the sixth information surface L5 has a low reflectivity area (LRA), a learning area, and a DMA area (OPC, DMA) arranged on the inner circumference, the inner circumference is the inner zone, and the outer circumference is the outer zone. Become. In this case, the address order of the sixth information surface L5 is recorded from the outer periphery to the inner periphery, and recording / reproduction is performed from the outer periphery to the inner periphery.
- a low reflectivity area (LRA), a learning area, and a DMA area (OPC, DMA) are arranged on the inner circumference, the inner circumference becomes a lead-out zone, and the outer circumference becomes an outer zone. In this case, the address order of the eighth information surface L7 is recorded from the outer periphery to the inner periphery, and the recording is reproduced from the outer periphery to the inner periphery.
- the second information surface L1 from the inner periphery to the outer periphery, the sixth information surface L5 from the outer periphery to the inner periphery, the fourth information surface L3 also has an inner peripheral force from the outer periphery, and the eighth information surface L7 from the outer periphery to the inner periphery. Recording and playback are performed sequentially.
- the addresses are counted up from the inner peripheral force to the outer periphery in the first to fourth information surfaces LO to L3, and the addresses are counted up from the outer periphery to the inner periphery in the fifth to eighth information surfaces L4 to L7.
- the address in the layer can be expressed by the number of bits of the address in the layer of one layer.
- the nth information surface is recorded or reproduced from the outer peripheral side to the inner peripheral side.
- FIG. 15 shows a substrate for manufacturing a multilayer information recording medium in the present embodiment. It is a figure for demonstrating the manufacturing method of the stamper which is a metal mold
- a photosensitive material such as a photoresist is applied on the glass plate 1601 to form a photosensitive film 1602 (see the first step in FIG. 15), and then a pattern such as pits and guide grooves is formed by optical recording with a laser beam 1603. (See step 2 in Fig. 15).
- FIG. 15 shows a portion where the photosensitive film 1602a is exposed in the second step. The exposed portion of the photosensitive material is removed through a development process, and an optical recording master 1605 on which patterns 1604 such as pits and guide grooves are formed is produced (see the third process in FIG.
- the shape of the pattern 1604 such as pits and guide grooves formed on the photosensitive film 1602 is transferred to the conductive film 1606 formed by a method such as sputtering or vapor deposition (see the fourth step in FIG. 15). Further, a plating film 1607 is formed to increase the rigidity and thickness of the conductive film 1606 (see the fifth step in FIG. 15). Next, the stamper 1608 is also produced by peeling the conductive film 1606 and the adhesive film 1607 from the interfacial force between the photosensitive film 1602 and the conductive film 1606 (see the sixth step in FIG. 15).
- FIG. 16 is a cross-sectional view of the multilayer information recording medium in the present embodiment.
- This multi-layer information recording medium is arranged on the first signal board 1701 on which the information surface of the pits and guide grooves having uneven shape force is transferred on one side, and on the surface on which the uneven shape of the first signal board 1701 is provided.
- the second thin film layer 1704 disposed on the surface of the signal substrate 1703 provided with the uneven shape, the transparent substrate 1706 disposed opposite to the second signal substrate 1703, the second thin film layer 1704, and the transparent substrate 1706 are attached. Consists of a transparent layer 1705 provided to match.
- the information recording layer is formed by forming the thin film layer on the information surface.
- the thickness of the first signal board 1701 is, for example, about 1.1 mm.
- the first thin film layer 1702 and the second thin film layer 1 704 include a recording film and a reflective film.
- the first thin film layer 1702 and the second thin film layer 1704 are formed on the surface of the first signal substrate 1701 and the second signal substrate 1703 where the pits and guide grooves are formed by a method such as sputtering or vapor deposition.
- the second signal substrate 1703 is formed by the photocoating resin spin coating method,
- the transfer substrate with pits and guide grooves formed on one side as an irregular shape like the stamper 1608 and the first signal substrate 1701 shown in the sixth step, is photo-curing so that the information surface faces the first signal substrate 1701. Paste through greaves.
- the second signal substrate 1703 is formed by peeling the transfer substrate from the interface with the photocurable resin.
- the transparent substrate 1706 is made of a material that is transparent (transmits) to recording / reproducing light, and has a thickness of, for example, about 0.1 mm.
- the transparent layer 1705 is provided for bonding the two substrates 1706 1707 to each other, and is made of an adhesive such as a photocurable resin or a pressure sensitive adhesive. Recording and reproduction of such a multilayer information recording medium is performed by making laser light incident from the transparent substrate 1706.
- FIG. 17 is a diagram for explaining the method of manufacturing the multilayer information recording medium in the present embodiment.
- the first signal substrate 801 has a first thin film layer 802 containing a recording film material or a reflective film material by a method such as sputtering or vapor deposition on the surface on which the signal surface of the pits or guide grooves is formed. As a result, an information recording layer is formed.
- the region of the first thin film layer 802 formed on the signal surface is determined by the region that masks the substrate during sputtering or vapor deposition.
- FIG. 18 is a cross-sectional view showing the structure of the sputtering apparatus.
- the substrate 1801 transported into the sputtering apparatus is placed where the inner mask 1802 and the outer mask 1803 are almost in contact.
- the inner disk 1802 has a structure in which the entire inner periphery of the substrate is covered so that a thin film layer is not formed on the inner diameter including the central hole of the substrate.
- the outer mask 1803 is configured not to form a thin film layer on the outer diameter of a specific substrate and to prevent the back surface of the substrate from wrapping around.
- the space 1804 which is made into a vacuum atmosphere with a vacuum pump or the like, plasma is generated by introduction of gas such as argon and discharge.
- ions argon ions in this case
- ions generated in the plasma collide with the material of the target 1805 installed at the base of the inner mask 1802 and the outer mask 1803, and atoms and molecules of the material constituting the target 1805 are caused to collide. Fly over the substrate and form a thin film on the substrate surface.
- the region where the first thin film layer 802 is formed includes the diameter of the inner mask 1802 and the outer mask 18. It is possible to change easily by changing the diameter of 03.
- the first signal substrate 801 is fixed on the rotating table 803 by means such as vacuum on the surface opposite to the surface on which the first thin film layer 802 is formed (see the first step in FIG. 17).
- the first thin film layer 802 on the first signal substrate 801 fixed to the rotary table 803 is coated with a photocurable resin 804 concentrically on a desired radius by a dispenser (second step in FIG. 17). reference).
- the photocurable resin 804 is stretched by spinning the rotary table 803 (see the third step in FIG. 17).
- the stretched photocurable resin 804 can remove excess resin and bubbles by centrifugal force.
- the thickness of the photocurable resin 804 to be stretched depends on the viscosity of the photocurable resin 804, the number of rotations of the spin rotation, the time, and the atmosphere such as the temperature and humidity around the spin rotation. By arbitrarily setting, it is possible to control to a desired thickness.
- the stretched photocurable resin 804 is cured by light irradiation of the light irradiator 805. In this manner, a first substrate 811 composed of the first signal substrate 801, the first thin film layer 802, and the photocurable resin 804 is produced.
- a second information surface is formed on the first signal substrate 801.
- a photocurable resin 808 is applied concentrically on a desired radius by a dispenser (see the fifth step in FIG. 17).
- the photocurable resin 808 is stretched by spinning the rotary table 807 (see the sixth step in FIG. 17). Similar to the photocurable resin 804, the photocurable resin 808 to be stretched can be controlled to have a desired thickness.
- the stretched photocurable resin 808 is cured by light irradiation of the light irradiator 809. In this way, the second substrate 810 composed of the transfer substrate 806 and the photocurable resin 808 is produced.
- the two substrates 810 and 811 are superposed on the single rotary table 803 via the photocurable resin 812 so that both photocurable resin layers face each other (the first figure in FIG. 17). 7), the rotating table 803 is rotated in a spin state in an integrated state.
- the light curable resin 812 is controlled to have a desired thickness by spin rotation, and then irradiated by the light irradiation machine 805. Cured by spraying (see step 8 in Fig. 17).
- the transfer substrate 806 is peeled off from the interface between the transfer substrate 806 and the photocurable resin 808, so that the first signal substrate 801 is removed.
- a second information surface is formed (see step 9 in FIG. 17).
- the photocurable resin 804 used here is selected to have good adhesion between the first thin film layer 802 and the photocurable resin 812. Further, a photocurable resin 808 is selected that has good releasability from the transfer substrate 806 and good adhesion to the photocurable resin 812. In addition, in order to form each photocurable resin as thin as possible, the viscosity is about 150 Pa's.
- a second thin film layer 813 containing a recording film material or a reflective film material is formed by a method such as sputtering or vapor deposition.
- the transparent layer 815 formed when the second thin film layer 813 and the transparent substrate 814 are bonded together is almost transparent (substantially transmissive) to the recording / reproducing light, and the second thin film layer 813 has a photocurable resin. It is formed by removing bubbles and controlling the thickness of the photocurable resin by spin rotation after coating, and curing by being irradiated with light after being stretched.
- the force explaining the multilayering of BD having a substrate thickness of 0.1 mm The present invention is not particularly limited to this, and the HD having a substrate thickness of 0.6 mm It can also be applied to DVD multi-layering, and can be applied to multi-layer optical disc media of the same type.
- a multilayer information recording medium is a multilayer information recording medium having a plurality of laminated information surfaces and recording or reproducing information by light, wherein the plurality of information surfaces include: At least one information surface having a first reflecting surface for reflecting the light with a predetermined first return light amount when light is incident, and a second return smaller than the first return light amount; And another information surface having a second reflecting surface that is reflected by the amount of light.
- the plurality of information surfaces of the multilayer information recording medium have at least one first reflection surface that reflects light with a predetermined first return light amount when light is incident.
- other information planes with
- the multilayer information recording medium has three or more layers of information recording surfaces, and the physical information different from the information recording surfaces up to the second is formed on the inner or outer periphery of the third or more information recording surfaces.
- characteristics reflectance, transmittance, groove characteristics, pit characteristics, etc.
- the multilayer information recording medium it is preferable that disk management information is recorded on the first reflecting surface. According to this configuration, the disc management information can be reproduced by irradiating the first reflecting surface with light.
- the multilayer information recording medium includes an optical disk medium, and the second reflecting surface includes an inner peripheral portion of the optical disk medium, and The reflectivity of the part is preferably lower than the reflectivity of the data area where data is recorded.
- the multilayer information recording medium includes the optical disk medium
- the second reflecting surface includes the inner periphery of the optical disk medium
- the reflectance of the inner periphery is determined by the data It is lower than the reflectivity of the data area that records. Therefore, since the reflectivity of the inner periphery is set lower than the reflectivity of the data area, it is ensured that the focus is drawn into the inner periphery of the information surface that matches the information surface of the information recording medium already on the market. Can be executed.
- the multilayer information recording medium includes an optical disk medium, and the first reflecting surface and the second reflecting surface are inner circumferences of the optical disk medium. And a data area for recording data, and the reflectivity of the inner periphery of the second reflecting surface and the data area is greater than the reflectivity of the inner periphery of the first reflecting surface and the data area. Low It is preferable.
- the reflectance of the inner peripheral portion of the second reflecting surface and the data region is lower than the reflectance of the inner peripheral portion of the first reflecting surface and the data region. Data recorded in the data area of the reflective surface can be reliably reproduced.
- the plurality of information surfaces include four information surfaces, and two information surfaces of the four information surfaces are the first reflection surface.
- the light is reflected by a predetermined first return light amount, and the remaining two information surfaces reflect the light when the light is incident on the second reflective surface. It is preferable to reflect with a second return light quantity that is smaller than the first return light quantity.
- the plurality of information surfaces include four information surfaces, and two of the four information surfaces have a light incident on the first reflecting surface. The light is reflected at a predetermined first return light amount. The remaining two information surfaces reflect the light with a second return light amount smaller than the first return light amount when the light enters the second reflection surface.
- the plurality of information surfaces include eight information surfaces, and four of the eight information surfaces emit light on the first reflecting surface. When incident, the light is reflected by a predetermined first return light amount, and the remaining four information surfaces are configured to reflect the light when the light is incident on the second reflection surface. It is preferable to reflect with a second return light quantity that is smaller than the light quantity.
- the plurality of information surfaces include eight information surfaces, and four of the eight information surfaces have a light incident on the first reflecting surface. The light is reflected at a predetermined first return light amount. The remaining four information surfaces reflect the light with a second return light amount smaller than the first return light amount when the light enters the second reflection surface.
- the ratio of the first return light amount to the output light amount is a high return light amount ratio Rb on the first reflection surface, and the output light is output on the second reflection surface.
- the ratio of the second return light quantity to the light quantity is the low return light quantity ratio Rd
- the low return light quantity ratio Rd is in the range of 0 ⁇ Rd ⁇ 3.5%
- the high return light quantity ratio Rb is 3 It is preferable to be in the range of 5% ⁇ Rb ⁇ 8%! /.
- the ratio of the first return light amount to the output light amount is set to the high return light amount ratio Rb on the first reflection surface, and the second return light amount to the output light amount is set on the second reflection surface.
- the ratio is the low return light ratio Rd
- the low return light ratio Rd is in the range 0 ⁇ Rd ⁇ 3.5%
- the high return light ratio Rb is in the range 3.5% ⁇ Rb ⁇ 8%. is there.
- the return light intensity ratio of the conventional two-layer information recording medium is specified to be 3.5% or more and 8% or less, and by lowering the return light intensity ratio Rd from this range, the focus pull-in ratio can be reduced.
- a multi-layer information recording medium having four or more layers can be recorded / reproduced by using an information recording apparatus corresponding to a two-layer information recording medium.
- the relationship between the low return light amount ratio Rd and the high return light amount ratio Rb is preferably 2 XRd and Rb. According to this configuration, since the relationship between the low return light ratio Rd and the high return light ratio Rb is 2 XRd ⁇ Rb, the high return light ratio Rb should be set to be larger than twice the low return light ratio Rd. As a result, the focus pull-in can be executed reliably.
- the low return light amount ratio Rd is sufficiently smaller than the high return light amount ratio Rb.
- the low return light amount ratio Rd is sufficiently small with respect to the high return light amount ratio Rb, and the low return light amount ratio Rd is approximately 0, so that the focus pull-in can be reliably performed.
- the low return light ratio Rd is sufficiently smaller than the high return light ratio Rb when the low return light ratio Rd is below the level of return light (reflected light) when information is recorded. Means.
- the multilayer information recording medium is an optical disc medium. It is preferable that the first reflecting surface and the second reflecting surface are provided within a range of 24 mm or less from the rotation center of the optical disc medium! /.
- the multilayer information recording medium includes the optical disk medium, and the first reflection surface and the second reflection surface are provided within a range of 24 mm from the rotation center of the optical disk medium. Therefore, it is possible to reliably perform the focus pull-in to the inner peripheral portion corresponding to the range within 24 mm from the rotation center of the optical disk medium.
- the first reflective surface includes a BCA area in which identification information unique to the multilayer information recording medium is recorded by burning the reflective layer.
- the first reflecting surface includes the BCA area in which identification information unique to the multilayer information recording medium is recorded by burning the reflecting layer. Even the information recording / reproducing apparatus can reliably reproduce the identification information from the BCA area of the multilayer information recording medium.
- the second reflecting surface is preliminarily recorded by laser light for initial recording. According to this configuration, since the initial recording is preliminarily performed by the second reflecting surface force laser light, the second returning light amount on the second reflecting surface of the other information surface is set to be higher than the first returning light amount. Can also be reduced.
- the second reflecting surface is formed by burning the reflecting layer. According to this configuration, since the second reflecting surface is formed by burning the reflecting layer, the second return light amount on the second reflecting surface of the other information surface is made larger than the first return light amount. Can be small.
- a reflective layer is not formed on the second reflective surface. According to this configuration, since the reflective layer is not formed on the second reflection surface that is reflected with the second return light amount, the second return light amount on the second reflection surface of the other information surface is the first return light amount.
- the return light quantity can be smaller than 1.
- the interval between the plurality of information surfaces is preferably 6 m to 3 O / zm. According to this configuration, by setting the interval between the plurality of information surfaces to 6 m to 30 m, it is possible to reduce the interference (interlayer interference) of diffracted light with each information surface power. it can.
- the multilayer information recording medium it is preferable that disk management information is recorded at least at two or more locations on the first reflecting surface. According to this configuration, the disc management information is recorded in at least two or more of the first reflecting surfaces arranged in the optical axis direction. Even so, it is possible to read other information-oriented disc management information.
- the above-described multi-layer information recording medium has an area where the disc management information is recorded so as not to overlap on the upper and lower information surfaces. According to this configuration, since the areas where the disk management information is recorded are arranged so as not to overlap on the upper and lower information surfaces, even if the information ability of 1 disk management information cannot be read. Other information capabilities Disc management information can be read reliably.
- a write prohibition flag that prohibits data recording in the user data area is recorded in units of information planes on the multilayer information recording medium, and the information plane that is prohibited by the write prohibition flags is recorded. It is preferable that data recording is prohibited.
- the write prohibition flag for prohibiting data recording in the user data area is recorded in units of information plane, and data recording on the information plane prohibited by the write prohibition flag is prohibited. . Therefore, by prohibiting data recording on the other information surfaces of the plurality of information surfaces of the multilayer information recording medium, compatibility with an information recording medium having a small number of layers can be ensured.
- the plurality of information surfaces includes the first to n-th information surfaces, and MOD (n / 4)
- the first information surface and the second information surface are recorded or reproduced from the inner periphery side toward the outer periphery side, and the third information surface is recorded. Since the information surface and the fourth information surface are recorded or reproduced from the outer peripheral side toward the inner peripheral side, real-time recording at a high transfer rate such as video recording / reproduction can be performed for a long time.
- the first information surface and the second information surface can record or reproduce information from the inner periphery side toward the outer periphery side.
- information can be recorded or reproduced by applying an outer peripheral force to the inner peripheral side.
- the plurality of information surfaces include first to n-th (n is an even number) information surfaces, and the first to nZ-th information surfaces are included in the optical disk medium. Recording or reproduction is performed from the circumferential side to the outer circumferential side, and the (nZ2) +1 to nth information surfaces are recorded or reproduced from the outer circumferential side to the inner circumferential side of the optical disk medium. It is preferable that
- the plurality of information surfaces include the first to nth (n is an even number) information surfaces, and the first to nZ2 information surfaces are on the inner peripheral side of the optical disc medium. Recording or playback from the outside toward the outer periphery.
- the (nZ2) +1 to nth information surfaces are recorded or reproduced from the outer peripheral side to the inner peripheral side of the optical disc medium.
- the first to fourth information surfaces are recorded or reproduced from the inner peripheral side to the outer peripheral side, and the fifth to eighth information surfaces are recorded. Since the surface is recorded or played back with the outer side force also directed toward the inner side, high rotation such as video recording / playback is possible. Real-time recording of the feed rate can be performed for a long time.
- addresses are recorded on the first to nZ2 information surfaces with the inner peripheral side force of the optical disc medium also directed to the outer peripheral side, and the (nZ2) + 1 It is preferable that addresses are recorded on the n-th information surface by directing force from the outer peripheral side to the inner peripheral side of the optical disc medium.
- addresses are recorded on the first to nth ZZ2 information surfaces from the inner periphery side to the outer periphery side of the optical disc medium.
- addresses are recorded on the (nZ2) +1 to n-th information surfaces from the outer peripheral side to the inner peripheral side of the optical disc medium.
- the first to fourth information surfaces can record or reproduce information from the inner peripheral side toward the outer peripheral side
- the eighth information surface is capable of recording or reproducing information from the outer peripheral side toward the inner peripheral side.
- the first to n-th information surfaces are formed so as to approach the laser incident surface by directing the first to n-th information surfaces.
- the first to nth information surfaces can be formed so as to approach the laser incident surface.
- An information recording / reproducing apparatus is an information recording / reproducing apparatus for recording or reproducing information from a multilayer recording medium having a plurality of stacked information surfaces,
- the information surface includes at least one information surface having a first reflection surface that reflects the light with a predetermined first return light amount when the light is incident, and the light is smaller than the first return light amount.
- a laser beam for recording or reproducing a signal on a signal track included in the multilayer information recording medium including another information surface having a second reflecting surface that is reflected by the second return light amount
- a laser beam irradiation unit that irradiates the laser beam a spherical aberration correction unit that corrects the spherical aberration of the laser beam
- a control unit that controls the focal position of the laser beam according to an information surface that irradiates the laser beam
- a laser is applied to the first reflecting surface of the multilayer information recording medium. The irradiation shines, and a medium discrimination unit for discriminating the number of information surfaces.
- the plurality of information surfaces of the multilayer information recording medium have at least one information surface having a first reflection surface that reflects the light with a predetermined first return light amount when the light is incident. And a second reflective surface that reflects light with a second return light quantity that is less than the first return light quantity. And other information aspects to do.
- a signal track included in the multilayer information recording medium is irradiated with a laser beam for recording or reproducing a signal, and the spherical aberration of the laser beam is corrected. Then, the focal position of the laser light is controlled in accordance with the information surface to be irradiated with the laser light, the laser light is irradiated to the first reflecting surface of the multilayer information recording medium, and the number of information surfaces is determined.
- the medium discriminating unit discriminates the number of information planes from the waveform information power of the focus error signal. According to this configuration, the number of waveform information power information planes of the focus error signal can be accurately determined.
- the flag setting unit for setting a write prohibition flag for prohibiting data recording in the user data area in units of information planes, and the flag setting unit It is preferable to further include a recording unit that does not record data on the information surface in which the write prohibition flag is set.
- the write prohibition flag for prohibiting data recording in the user data area is set for each information plane, and data recording on the information plane for which the write prohibition flag is set is not performed. Therefore, data recording is not performed on the other information surface of the plurality of information surfaces of the multilayer information recording medium, so that compatibility with the information recording medium with a small number of layers can be maintained.
- a method for producing a multilayer information recording medium is a method for producing a multilayer information recording medium having a plurality of laminated information surfaces, wherein the information surface is formed on one side of the substrate. And a second step of forming a light-transmitting intermediate layer having an information surface on the reflective layer, and a reflection on the information surface side of the intermediate layer. A fourth step of forming a translucent protective layer after forming a plurality of information surfaces by repeating the third step of forming a layer, the second step and the third step a plurality of times.
- a first reflective layer that reflects the light with a predetermined first return light amount on at least one information surface and reflecting the light with a second return light amount that is smaller than the first return light amount. And a second step of forming the second reflecting surface on the other information surface.
- the reflective layer is formed on the substrate having the information surface formed on one side.
- a translucent intermediate layer having an information surface is formed on the reflective layer.
- a reflective layer is formed on the information surface side of the intermediate layer.
- a translucent protective layer is formed.
- a first reflecting surface that reflects the light with a predetermined first return light amount is formed on at least one information surface, and the light is A second reflection surface that reflects with a second return light amount smaller than the return light amount is formed on the other information surface.
- the fifth step includes the step of performing the initial recording on the other information surface by laser light. It is preferable to form a reflective surface.
- the second reflecting surface is formed by performing initial recording with laser light in advance on the other information surface.
- the second return light amount on the reflecting surface can be made smaller than the first return light amount.
- the fifth step is to irradiate the other information surface with a laser beam to burn the reflective layer. It is preferable to form a second reflecting surface.
- the second reflection surface is formed by previously burning the reflection layer with the laser light with respect to the other information surface.
- the second return light amount on the second reflecting surface can be made smaller than the first return light amount.
- the first and third steps may be performed by performing a mask process on the other information surface when forming the reflective layer. It is preferable to form a reflective surface.
- the second reflective surface is formed by performing mask processing on the other information surface.
- no reflection layer is formed on the second reflection surface of the other information surface, and the second return light amount on the second reflection surface of the other information surface can be made smaller than the first return light amount.
- the plurality of information planes include the first to nth information planes, and MOD (n / 4)
- addresses are formed in order from the outer peripheral side to the inner peripheral side of the optical disc medium.
- the first information surface and the second information The surface can record or reproduce information from the inner periphery side toward the outer periphery side.
- the third information surface and the fourth information surface have information on the outer periphery side that is also directed toward the inner periphery side. Can be recorded or played back.
- the plurality of information surfaces include the first to nth (n is an even number) information surfaces, and the first to nZ2
- the information plane and the (nZ2) +1 to nth information planes are formed so that the directions of the spirals are opposite to each other.
- the plurality of information planes include the first to nth (n is an even number) information plane, the first to nZ2 information planes, and the (nZ2) + 1 To the nth information surface are formed so that the directions of the spirals are opposite to each other.
- the tracking directions on the first to fourth information surfaces are opposite to the tracking directions on the fifth to eighth information surfaces. There is no need to seek from the outer circumference to the outer circumference or from the outer circumference to the inner circumference, and real-time recording at a high transfer rate such as video recording and reproduction can be performed for a long time.
- the first to nth ZZ2 information surfaces are formed with addresses in order from the inner peripheral side to the outer peripheral side of the optical disc medium.
- addresses are formed in order from the outer peripheral side to the inner peripheral side of the optical disk medium.
- the addresses of the first to nth ZZ2 information surfaces are formed in order from the inner periphery side to the outer periphery side of the optical disc medium.
- the addresses of the (nZ2) +1 to nth information surfaces are formed in order from the outer peripheral side to the inner peripheral side of the optical disc medium.
- the first to fourth information surfaces can record or reproduce information from the inner circumference side toward the outer circumference side.
- the eighth information surface is capable of recording or reproducing information from the outer peripheral side toward the inner peripheral side.
- the first to n-th information surfaces are preferably formed so as to approach the laser incident surface from the first to the n-th information surface. That's right. According to this configuration, the first to nth information surfaces can be formed so as to approach the laser incident surface.
- the multilayer information recording medium, the information recording / reproducing apparatus, and the manufacturing method of the multilayer information recording medium according to the present invention can ensure backward compatibility with an information recording medium that has already been released or has a known format.
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Optical Recording Or Reproduction (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008502726A JPWO2007099835A1 (ja) | 2006-03-03 | 2007-02-21 | 多層情報記録媒体、情報記録再生装置及び多層情報記録媒体の製造方法 |
US12/281,530 US20090016188A1 (en) | 2006-03-03 | 2007-02-21 | Multi-layer information recording medium, information recording/reproducing device and multi-layer information recording medium manufacturing method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006057399 | 2006-03-03 | ||
JP2006-057399 | 2006-03-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007099835A1 true WO2007099835A1 (ja) | 2007-09-07 |
Family
ID=38458946
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/053213 WO2007099835A1 (ja) | 2006-03-03 | 2007-02-21 | 多層情報記録媒体、情報記録再生装置及び多層情報記録媒体の製造方法 |
Country Status (4)
Country | Link |
---|---|
US (1) | US20090016188A1 (ja) |
JP (1) | JPWO2007099835A1 (ja) |
CN (1) | CN101395665A (ja) |
WO (1) | WO2007099835A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010050143A1 (ja) * | 2008-10-27 | 2010-05-06 | パナソニック株式会社 | 情報記録媒体、記録装置および再生装置 |
WO2010050144A1 (ja) * | 2008-10-27 | 2010-05-06 | パナソニック株式会社 | 情報記録媒体、記録装置および再生装置 |
JP2010140576A (ja) * | 2008-12-15 | 2010-06-24 | Hitachi Ltd | 多層光ディスクおよび光ディスク装置 |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4825775B2 (ja) * | 2007-11-08 | 2011-11-30 | 株式会社日立製作所 | 光ディスク記録再生装置及び光ディスク記録再生方法 |
US20100172226A1 (en) * | 2008-10-27 | 2010-07-08 | Panasonic Corporation | Information recording medium, reproduction apparatus and recording apparatus |
JPWO2010061557A1 (ja) * | 2008-11-26 | 2012-04-19 | パナソニック株式会社 | 情報記録媒体、記録装置、再生装置および再生方法 |
WO2011007841A1 (ja) * | 2009-07-17 | 2011-01-20 | シャープ株式会社 | 光情報記録媒体 |
JP2011192378A (ja) * | 2010-02-19 | 2011-09-29 | Panasonic Corp | 光ディスク装置および光ディスクの再生方法 |
US9590580B1 (en) * | 2015-09-13 | 2017-03-07 | Guoguang Electric Company Limited | Loudness-based audio-signal compensation |
Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03219440A (ja) * | 1989-10-30 | 1991-09-26 | Matsushita Electric Ind Co Ltd | 多層記録光ディスク |
JPH0478033A (ja) * | 1990-07-13 | 1992-03-12 | Toshiba Corp | 多層光記録媒体 |
JPH0922542A (ja) * | 1995-07-05 | 1997-01-21 | Nippon Columbia Co Ltd | 多層の情報面を有する光ディスク |
JPH0944898A (ja) * | 1995-07-25 | 1997-02-14 | Sony Corp | 光学ディスク |
JPH0950649A (ja) * | 1995-08-03 | 1997-02-18 | Matsushita Electric Ind Co Ltd | 光ディスクおよび光ディスク装置 |
WO2001001408A1 (fr) * | 1999-06-28 | 2001-01-04 | Sony Corporation | Support d'enregistrement optique et son procede de lecture |
JP2001023236A (ja) * | 1999-07-12 | 2001-01-26 | Matsushita Electric Ind Co Ltd | 光学情報記録媒体およびその初期化方法 |
JP2002216361A (ja) * | 2001-01-22 | 2002-08-02 | Sharp Corp | 光ディスク及び光記録再生装置 |
WO2002086873A1 (fr) * | 2001-04-17 | 2002-10-31 | Matsushita Electric Industrial Co., Ltd. | Disque optique, procede d'enregistrement/reproduction d'informations, et dispositif d'enregistrement/reproduction d'informations utilisant ce procede |
JP2002373426A (ja) * | 2001-06-13 | 2002-12-26 | Sharp Corp | 光記録媒体、光記録再生装置および光記録再生方法 |
JP2003006919A (ja) * | 2001-06-22 | 2003-01-10 | Matsushita Electric Ind Co Ltd | 光記録媒体、および光記録媒体製造方法 |
JP2004247024A (ja) * | 2002-12-20 | 2004-09-02 | Mitsubishi Chemicals Corp | 光記録媒体及びその記録再生方法 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1118988B1 (en) * | 1999-07-12 | 2009-07-01 | Panasonic Corporation | Optical information recording medium and method for initializing the same |
US7158452B2 (en) * | 2001-02-22 | 2007-01-02 | Matsushita Electric Industrial Co., Ltd. | Focus control for optical disk unit |
US7180849B2 (en) * | 2001-05-18 | 2007-02-20 | Sharp Kabushiki Kaisha | Optical storage medium enabling uniform light transmittance, optical read/write apparatus for same, and optical read/write method for same |
JP4295474B2 (ja) * | 2002-05-24 | 2009-07-15 | ソニー株式会社 | ディスク記録媒体、ディスクドライブ装置、ディスク製造方法 |
-
2007
- 2007-02-21 CN CN200780007565.0A patent/CN101395665A/zh active Pending
- 2007-02-21 US US12/281,530 patent/US20090016188A1/en not_active Abandoned
- 2007-02-21 JP JP2008502726A patent/JPWO2007099835A1/ja active Pending
- 2007-02-21 WO PCT/JP2007/053213 patent/WO2007099835A1/ja active Application Filing
Patent Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03219440A (ja) * | 1989-10-30 | 1991-09-26 | Matsushita Electric Ind Co Ltd | 多層記録光ディスク |
JPH0478033A (ja) * | 1990-07-13 | 1992-03-12 | Toshiba Corp | 多層光記録媒体 |
JPH0922542A (ja) * | 1995-07-05 | 1997-01-21 | Nippon Columbia Co Ltd | 多層の情報面を有する光ディスク |
JPH0944898A (ja) * | 1995-07-25 | 1997-02-14 | Sony Corp | 光学ディスク |
JPH0950649A (ja) * | 1995-08-03 | 1997-02-18 | Matsushita Electric Ind Co Ltd | 光ディスクおよび光ディスク装置 |
WO2001001408A1 (fr) * | 1999-06-28 | 2001-01-04 | Sony Corporation | Support d'enregistrement optique et son procede de lecture |
JP2001023236A (ja) * | 1999-07-12 | 2001-01-26 | Matsushita Electric Ind Co Ltd | 光学情報記録媒体およびその初期化方法 |
JP2002216361A (ja) * | 2001-01-22 | 2002-08-02 | Sharp Corp | 光ディスク及び光記録再生装置 |
WO2002086873A1 (fr) * | 2001-04-17 | 2002-10-31 | Matsushita Electric Industrial Co., Ltd. | Disque optique, procede d'enregistrement/reproduction d'informations, et dispositif d'enregistrement/reproduction d'informations utilisant ce procede |
JP2002373426A (ja) * | 2001-06-13 | 2002-12-26 | Sharp Corp | 光記録媒体、光記録再生装置および光記録再生方法 |
JP2003006919A (ja) * | 2001-06-22 | 2003-01-10 | Matsushita Electric Ind Co Ltd | 光記録媒体、および光記録媒体製造方法 |
JP2004247024A (ja) * | 2002-12-20 | 2004-09-02 | Mitsubishi Chemicals Corp | 光記録媒体及びその記録再生方法 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010050143A1 (ja) * | 2008-10-27 | 2010-05-06 | パナソニック株式会社 | 情報記録媒体、記録装置および再生装置 |
WO2010050144A1 (ja) * | 2008-10-27 | 2010-05-06 | パナソニック株式会社 | 情報記録媒体、記録装置および再生装置 |
JP2010140576A (ja) * | 2008-12-15 | 2010-06-24 | Hitachi Ltd | 多層光ディスクおよび光ディスク装置 |
Also Published As
Publication number | Publication date |
---|---|
US20090016188A1 (en) | 2009-01-15 |
JPWO2007099835A1 (ja) | 2009-07-16 |
CN101395665A (zh) | 2009-03-25 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4843082B2 (ja) | 多層ディスクおよび記録パワー決定方法 | |
JP4790835B2 (ja) | 光ディスク記録装置および光ディスク再生装置 | |
WO2007099835A1 (ja) | 多層情報記録媒体、情報記録再生装置及び多層情報記録媒体の製造方法 | |
WO2010050143A1 (ja) | 情報記録媒体、記録装置および再生装置 | |
JP2010186542A (ja) | 光情報記録媒体 | |
JP2006236509A (ja) | 光記録媒体およびその製造方法 | |
JP4729125B2 (ja) | 光情報記録媒体 | |
JP2009181614A (ja) | 光ディスクおよび光ディスク装置 | |
JP2009037705A (ja) | 情報記録媒体及び情報記録再生装置並びに情報記録再生方法 | |
JP4567807B2 (ja) | 光情報記録媒体 | |
JP2005116176A (ja) | 多層情報記録媒体及び情報再生装置 | |
JP2008010079A (ja) | 追記型多層光ディスク、記録方法、再生方法及び光ディスク装置 | |
JP4641189B2 (ja) | 情報再生装置 | |
JP2009134784A (ja) | 多層光記録媒体、光記録再生方法 | |
WO2010050144A1 (ja) | 情報記録媒体、記録装置および再生装置 | |
JP2005116177A (ja) | 多層情報記録媒体及び情報再生装置 | |
JP2013122805A (ja) | 光情報記録媒体、基準再生光パワー決定方法、光情報記録媒体再生方法および光情報記録媒体再生装置 | |
JP2008123691A (ja) | 光ディスクおよび光ディスク記録装置並びに光ディスク再生装置 | |
JP2008171457A (ja) | 光ディスクシステム、それに用いる光ディスク駆動装置及び光ディスク | |
JP2005158174A (ja) | データ記録方法および記録装置 | |
JP2009295268A (ja) | 光記録媒体の再生方法、光記録媒体の再生装置 | |
JP2009295267A (ja) | 光記録媒体の再生方法、光記録媒体の再生装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
ENP | Entry into the national phase |
Ref document number: 2008502726 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 200780007565.0 Country of ref document: CN |
|
WWE | Wipo information: entry into national phase |
Ref document number: 12281530 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 07714713 Country of ref document: EP Kind code of ref document: A1 |