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WO2014064733A1 - Support d'enregistrement optique, dispositif de format et procédé de formatage - Google Patents

Support d'enregistrement optique, dispositif de format et procédé de formatage Download PDF

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Publication number
WO2014064733A1
WO2014064733A1 PCT/JP2012/006796 JP2012006796W WO2014064733A1 WO 2014064733 A1 WO2014064733 A1 WO 2014064733A1 JP 2012006796 W JP2012006796 W JP 2012006796W WO 2014064733 A1 WO2014064733 A1 WO 2014064733A1
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WO
WIPO (PCT)
Prior art keywords
light beam
correction
layer
recording
recording layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2012/006796
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English (en)
Japanese (ja)
Inventor
克也 渡邊
耕一 瓜田
良一 今中
哲雄 細美
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Panasonic Corp
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Panasonic Corp
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Publication date
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Priority to PCT/JP2012/006796 priority Critical patent/WO2014064733A1/fr
Publication of WO2014064733A1 publication Critical patent/WO2014064733A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • G11B7/007—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
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0945—Methods for initialising servos, start-up sequences
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2403—Layers; Shape, structure or physical properties thereof
    • G11B7/24035—Recording layers
    • G11B7/24038—Multiple laminated recording layers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • 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
    • G11B7/24047—Substrates
    • G11B7/2405—Substrates being also used as track layers of pre-formatted layers

Definitions

  • the present invention relates to an optical recording medium in which a plurality of flat recording layers on which sample servo information serving as a reference for tracking is formed, and an optical recording medium formatting apparatus and formatting method.
  • an optical recording medium in which a plurality of recording layers are laminated, there is a method of forming an uneven track for tracking control in each layer, but the amount of light incident on the lower recording layer is insufficient due to diffraction of the light beam. As a result, recording and reproducing information may be difficult.
  • an optical recording medium is used that has a flat recording layer without providing a tracking groove in each recording layer and includes a reference layer on which a reference track is formed. In the optical recording medium having the reference layer, information is recorded / reproduced with another beam while tracking the reference track with one beam.
  • the reference layer and the recording layer have different depths in the optical recording medium. It is necessary to correct aberrations such as aberrations.
  • aberrations such as aberrations.
  • uneven prepit information formed on the recording layer is used.
  • prepits are used to avoid the influence of light beam diffraction. There was a problem that information could not be formed and aberrations could not be corrected.
  • an object of the present invention is to easily perform aberration correction even in an optical recording medium having a multilayered recording layer.
  • an optical recording medium of the present invention is formed on a substrate, a plurality of recording layers laminated on the substrate, a reference layer laminated together with the recording layer, and the reference layer.
  • the reference track is used for tracking when forming the sample servo information
  • the sample servo information is used for tracking when recording and reproducing data
  • aberration correction is performed using the correction mark.
  • a plurality of recording layers stacked on the substrate, a first reference layer and a second reference layer stacked together with the recording layer, and a spiral first layer formed on the first reference layer
  • the reference track is used for tracking when the first sample servo information and the second sample servo information are formed, respectively, and the first sample servo information and the second sample servo information are used when recording and reproducing data. It is used for tracking, and aberration correction is performed using the correction mark.
  • the correction mark is formed at a position shifted from each other by a different angle with respect to one radius of the substrate for each recording layer.
  • a servo mark is formed on the recording layer of an optical recording medium including one or a plurality of reference layers including a reference track and a plurality of recording layers including a correction mark, and the first light beam
  • the step of tracking to the reference track, the step of irradiating the correction mark of the recording layer to be formatted while tracking the reference track, the second light beam to the correction mark, and the second correction beam to the correction mark Analyzing the change in the light amount distribution of the reflected light irradiated with the light beam, adjusting the position of the optical system used for the irradiation of the second light beam from the analysis result, and correcting the aberration; Forming a servo mark with a light beam and performing formatting.
  • the formatting apparatus of the present invention forms a servo mark on the recording layer of the optical recording medium including one or a plurality of reference layers including a reference track and a plurality of recording layers including a correction mark, and the first light beam
  • a first laser light source that emits light
  • a second laser light source that emits a second light beam
  • a collimating lens that makes the second light beam substantially parallel light, the first light beam, and the first light beam.
  • the objective lens that irradiates the optical recording medium with the second light beam and the amount of change in the light amount or the light amount distribution of the reflected light of the second light beam reflected before and after the edge of the correction mark are detected and corrected.
  • a light detector for outputting a control signal for correction, and an actuator for correcting aberration by moving the collimating lens in the optical axis direction according to the control signal for correction. While tracking the reference track over beam, and forming said servo mark by the irradiation of the second light beam.
  • two reference layers may be provided, and the reference track formed in the two reference layers may be a reverse spiral.
  • the first light beam may be a red laser light beam
  • the second light beam may be a blue laser light beam
  • focus position adjustment and aberration correction can be easily performed even with an optical recording medium having a multi-layered recording layer.
  • FIG. 6 illustrates a configuration of an optical recording medium according to Embodiment 1.
  • the figure which illustrates the structure of the correction mark in the optical recording medium of the present invention Sectional view illustrating the configuration of the optical recording medium in Embodiment 1
  • FIG. 6 illustrates a configuration of an optical recording medium according to Embodiment 2.
  • FIG. 1 Flow chart illustrating the formatting method of the present invention Flow chart explaining the aberration correction method of the present invention
  • the figure explaining the structure of the photodetector of this invention The figure explaining the analysis result of the reflected light at the time of passing the correction mark
  • the figure which illustrates the analysis result of the light quantity distribution with the aberration The figure which illustrates the analysis result of the light quantity distribution with the aberration Diagram showing the relationship between differential output and spherical aberration
  • the optical recording medium of the present invention is an optical recording medium in which one or a plurality of reference layers and a plurality of concave and convex recording layers on which sample servo information is recorded are laminated, and focus on each recording layer. It is characterized in that a correction mark used for position adjustment and aberration correction is formed.
  • the correction mark has a configuration in which at least one side forming the outer periphery thereof is formed in the radial direction of the recording layer, the surface is flat without unevenness, and the reflectance is different from the above-mentioned side as a boundary.
  • the correction mark is flat by performing focus position adjustment and aberration correction using the correction mark, the light beam is diffracted by the correction mark even if the recording layer of the optical recording medium is multilayered. Therefore, focus position adjustment and aberration correction can be easily performed. Further, in each recording layer, the correction marks are shifted from each other in the scanning direction of the light beam, so that the diffraction of the light beam can be further reduced and the number of recording layers being accessed depends on the position of the correction mark.
  • the recording layer can be specified.
  • FIG. 1A and 1B are diagrams for explaining the configuration of an optical recording medium according to Embodiment 1.
  • FIG. 1A is a perspective view showing the configuration of an optical disc that is an optical recording medium
  • FIG. 1B is a reference that constitutes the optical disc.
  • FIG. 1C is a perspective view showing a configuration of a recording layer constituting an optical disc.
  • FIG. 2 is a diagram illustrating the configuration of the correction mark in the optical recording medium of the present invention.
  • FIG. 3 is a cross-sectional view illustrating the configuration of the optical recording medium in the first embodiment.
  • each recording layer 101 of the optical disc 100 includes a recording area 104, a lead-in 102 which is an inner peripheral area where no data is recorded, and a lead-out 103 which is an outer peripheral area where no data is recorded.
  • the optical disc 100 includes one or a plurality of reference layers 106, and a reference track 108 is provided on the reference layer 106.
  • the reference track 108 is used for tracking when the sample servo information 112 is formed along the virtual track 111 of the recording layer 101.
  • the optical disc 100 includes a plurality of recording layers 101, and sample servo information 112 used for tracking when data is recorded / reproduced is formed along the virtual track 111 in each recording layer 101.
  • the sample servo information 112 includes a plurality of servo marks 110, and the virtual track 111 is assumed to correspond to the center or edge of the reference track 108 of the reference layer 106.
  • a feature of the optical recording medium of the present invention is that a correction mark 209 is formed on each recording layer 101.
  • the correction mark 209 has at least one of the sides forming the periphery of the correction mark 209 formed in the radial direction of the recording layer 101, and crosses this side when the light beam is scanned along the virtual track 111. It is a shape like this.
  • the correction mark 209 is formed along the virtual track 111 so that the reflectance of light with the surroundings is different. Focus position adjustment and aberration correction are performed by scanning the correction mark 209 with a light beam and analyzing the change in the light amount or light amount distribution of the light spot to detect a shift in focus or aberration.
  • the correction mark 209 can be flattened, so that light beam mixing and diffraction loss due to the correction mark 209 are reduced. be able to. Therefore, even if the recording layers are made multilayer, when accessing each recording layer 101, it is possible to easily perform focus position adjustment and aberration correction by using the correction marks 209 having different light reflectances from the surroundings. Since the quality of the light spot irradiated on the layer 101 can be maintained, good data recording / reproduction can be realized.
  • the correction mark 209 may be formed anywhere as long as the virtual track 111 of the recording layer 101 is supposed to be formed. However, in order to secure an area for recording data, the lead-in 102 or the lead-out 103 is used. It is preferable to form. At this time, the reference track 108 of the reference layer 106 may be formed so that the virtual track 111 is assumed in the lead-in 102 or the lead-out 103.
  • the correction mark 209 having a different reflectance from the surrounding reflectance can be formed, for example, by forming the correction mark 209 in which the recording film is not formed in the region where the recording film is formed.
  • the reflectance of the light of the recording film is about 3%, whereas the reflectance of the base of the recording layer 101 is almost 0%. Therefore, the correction mark 209 is formed by this reflectance difference.
  • the correction marks 209 formed on the respective recording layers 101 are formed so as to be shifted relative to each other on the concentric circles of the recording layer 101 so that they do not overlap when irradiated with a light beam.
  • the correction marks 209 of each recording layer 101 may be shifted from the line in the circumferential direction by different angles.
  • the position of the correction mark 209 is relatively different for each recording layer 101 on the circumference of the recording layer 101, the diffraction of the light beam by the correction mark 209 of the different recording layer 101 is different from that of the other recording layers. It is possible to prevent the layer 101 from being adversely affected, and to specify the recording layer 101 from which the correction mark 209 has been read, that is, the number of the recording layer 101 being accessed.
  • correction mark 209 is formed by not forming the recording film in the region where the recording film of the lead-in 102 is formed.
  • the correction marks 209 are arranged so as to be shifted by a certain angle ⁇ for each recording layer 101.
  • a correction mark 2090 is formed at the same position as the position 230 on the recording layer 101 located immediately above the reference layer 106, and the upper recording layer 101 is formed thereon.
  • the correction mark 2091 is formed by shifting the angle ⁇ counterclockwise from the position 230.
  • correction marks 2092,... are sequentially formed on the upper recording layer 101 by further shifting the angle ⁇ . .. 209A... Are formed on the recording layer 101 located below the reference layer 106 by shifting the angle .theta.
  • the correction mark 209 for each recording layer can be obtained, for example, by depositing a recording film such as a mask 215 for each recording layer and depositing or sputtering the recording film. That is, the recording area 104 and the correction mark 209 are formed by placing the mask 215 by shifting the angle with respect to the position 230 for each recording layer 101 and forming a recording film on each recording layer 101. Since the manufacturing process of such an optical disc is already known in the known optical disc technology, a detailed description is omitted.
  • the configuration in which the correction mark 209 is shifted by a fixed angle ⁇ has been described as an example. However, the shift angle does not have to be constant, and all the correction marks 209 do not overlap in the optical axis direction.
  • the formation position is shifted.
  • the reference layer 106 may be provided at the uppermost layer, the lowermost layer, or an arbitrary position of the recording layer 101 to be stacked.
  • the lead-out 103 In the recording layer 101 of the optical disc 100 of the present invention, no information is recorded on the lead-out 103, so that no recording film is formed.
  • the lead-out 103 also includes the recording layer 101 and the recording layer 101. It is desirable to form the same recording film.
  • the reference track 108 formed of a spiral groove is shown as an example in FIG. 1B, but is not limited thereto.
  • the shape of the reference track 108 may be a spiral, concentric circle, or discretely arranged pits or land / groove information that can be tracked.
  • the reference layer 106 is not necessarily built in the optical disc 100, and can be provided outside as long as it rotates integrally with the optical disc when the optical disc is formatted.
  • the reference layer 106 is not limited to one layer, and two or more reference layers 106 may be provided as a minimum according to the number of recording layers 101 to be stacked.
  • FIG. 3 shows a cross section 200 of the optical disc used in the present invention cut along AA ′ in FIG.
  • a first recording layer region 203 is formed by alternately laminating a flat recording layer 101 without a groove and a light-transmitting spacer layer 205 on a substrate 201.
  • a reference layer 106 is disposed on the first recording region 203, and a second recording layer 101 is formed by alternately laminating a flat recording layer 101 without a groove and a light-transmitting spacer layer 205 on the surface of the reference layer 106.
  • a recording layer region 204 is formed.
  • a cover layer 202 having translucency is formed on the surface of the second recording layer region 204.
  • the lead-in area is 102
  • the lead-out area is not particularly provided
  • a recording layer is formed on the entire surface except for the inner peripheral portion of the lead-in 102.
  • a correction mark 209 formed by not providing a recording film in the lead-in 102, which is an inner peripheral area where no data is recorded, is provided. As described with reference to FIG. 2, the correction marks 209 are arranged so as to be shifted in the circumferential direction by a certain angle for each recording layer with respect to the reference position of the reference layer 106.
  • the number of recording layers 101 in the first recording layer area 203 is set to be larger than the number of recording layers 101 in the second recording layer area 204. This can partially match the arrangement of the recording layer 101 in the second recording layer area 204 and the arrangement of the existing Blu-ray DISC (registered trademark) recording layer. This is because the compatibility of the optical recording medium of the present invention with the Blu-ray DISC (registered trademark) standard can be ensured as the compatibility layer.
  • By arranging the recording layer 101 in the second recording layer area 204 in this way it is partially compatible with a conventional disc manufacturing apparatus, or backward compatible with a Blu-ray DISC (registered trademark) recorder or player. There is an advantage that becomes easy.
  • the recording layer 101 is surrounded by the surrounding and light.
  • the correction marks 209 having different reflectances, the focus position adjustment and aberration correction can be easily performed using the correction marks 209, and the quality of the light spot irradiated on the recording layer 101 can be maintained. Therefore, it is possible to realize a good format and good recording / reproduction of data. Further, by relatively shifting the formation position of the correction mark 209 for each recording layer 101, it is possible to prevent the diffraction of the light beam by the correction mark 209 of different recording layers 101 from adversely affecting the other recording layers 101. At the same time, the recording layer 101 from which the correction mark 209 is read can be specified.
  • the correction mark 209 (see FIG. 2) is formed by not providing a recording film, the reflectance is almost 0%, and the correction mark 209 (see FIG. 2) is on the correction mark 209 (see FIG. 2). While the light beam is scanning, no focus error can be detected. Therefore, since the reflected light during this period becomes a step-like disturbance signal with respect to the focus control, the width of the correction mark 209 (see FIG. 2) is equal to or shorter than the time during which the disturbance of the reflected light makes the focus control unstable. It is better to set as follows. Further, since the correction marks 2091 and 2092 (see FIG. 2) adjacent to the correction mark 2091 in the layer direction are mixed with a disturbance signal due to the influence of transmission and reflection with the adjacent layer on the focus control.
  • the shift amount of the correction mark 209X (see FIG. 2) adjacent in the layer direction is preferably separated from the distance at which the focus control is stable. (Embodiment 2) Next, the structure of an optical disc that is an optical recording medium in Embodiment 2 of the present invention will be described with reference to FIG.
  • FIG. 4 is a diagram for explaining the configuration of the optical recording medium according to the second embodiment.
  • the optical recording medium in the second embodiment is characterized in that each recording layer is provided with correction marks having different reflectances from the surroundings.
  • the difference from the optical recording medium in the first embodiment is that two reference layers are provided, the spiral directions of the spiral reference tracks formed in each reference layer are opposite to each other, and the spiral directions of the virtual tracks are alternately reversed.
  • the recording layers are laminated in order so as to be oriented.
  • the optical recording medium in Embodiment 2 includes two reference layers 106a and 106b.
  • the reference layers 106a and 106b are provided with spiral reference tracks 108a and 108b whose spiral directions are opposite to each other.
  • a plurality of recording layers are stacked, and a virtual track is assumed for each, and sample servo information (not shown) is formed along the virtual track.
  • the spiral direction of the virtual track is formed in the reverse direction in order in the recording layer to be laminated.
  • the optical recording medium according to the second embodiment includes two reference layers, a reference layer 106a provided with a reference track 108a, and a reference layer 108b provided with a reference track 108b in which a spiral is formed in the opposite direction to the reference track 108a. 106b. Then, assuming a virtual track 111a corresponding to the reference track 108a in a certain layer, for example, the recording layer 101a adjacent to the reference layer 106b, sample servo information (not shown) is formed along the virtual track 111a.
  • the recording layer 101b stacked on the recording layer 101a assumes a virtual track 111b whose spiral direction is opposite to the virtual track 111a corresponding to the reference track 108b of the reference layer 106b, and samples along the virtual track 111b.
  • Servo information (not shown) is formed.
  • the recording layer 101c stacked on the recording layer 101b assumes a virtual track 111c having a spiral direction opposite to that of the virtual track 111b, that is, the virtual track 111a and the spiral direction being the same, and a sample servo along the virtual track 111c.
  • Form information (not shown).
  • the recording layer 101d stacked on the recording layer 101c assumes a virtual track 111d in which the spiral direction is opposite to that of the virtual track 111c, that is, the virtual track 111b and the spiral direction are the same, and the sample servo along the virtual track 111d is assumed. Form information (not shown). Subsequently, the virtual tracks assumed in the adjacent recording layers are sequentially reversed in spirals, and sample servo information (not shown) is formed along each virtual track.
  • FIG. 4 the case where the reference layers 106a and 106b are provided in the lowermost layer has been described as an example. However, the reference layers 106a and 106b may be provided in the uppermost layer, and any recording layer in which the reference layers 106a and 106b are respectively stacked.
  • sample servo information is formed in adjacent recording layers so as to have a reverse spiral
  • tracking is applied to the reference layer 106a or the reference layer 106b. If the reference layers are adjacent to each other, the reference by focus jump is used. Layer switching can be performed in a short time.
  • the virtual tracks 111a and 111c are assumed to correspond to the reference track 108a, and the virtual tracks 111b and 111d are assumed to correspond to the reference track 108b.
  • the formatting time can be shortened.
  • the light beam is moved between successive layers at the time of recording / reproduction, it is not necessary to seek between the inner circumference and the outer circumference of the recording layer, so that the recording / reproduction time can be shortened.
  • focus adjustment and aberration correction can be made faster.
  • the correction mark 209 is formed on each recording layer as in the optical recording medium according to the first embodiment. Further, the correction mark 209 is formed so that the reflectance of light is different from that of the periphery, and is formed so as to have a side that coincides with the radius of the recording layer as the outer periphery.
  • a correction mark 209 it is possible to easily perform focus position adjustment and aberration correction from the state of change in the amount of reflected light when the light beam passes through the outer periphery during formatting or data recording / reproduction.
  • the quality of the light spot irradiated on the recording layer 101 can be maintained, a good format and good recording / reproduction of data can be realized.
  • diffraction of the light beam from the correction mark 209 in the recording layer other than the target recording layer is performed by relatively shifting the formation position of the correction mark 209 for each recording layer. Loss and mixing can be prevented, and the recording layer can be specified.
  • the configuration can be the same as that of the correction mark 209 in the first embodiment.
  • FIG. 5 is a flowchart for explaining the formatting method of the present invention
  • FIG. 6 is a flowchart for explaining the aberration correcting method of the present invention.
  • the recording layer 101 when the sample servo information 112 including the servo marks 110 is formed in the format, the recording layer 101 includes one or more reference layers 106. Sample servo information 112 is formed along a virtual track 111 corresponding to the reference track 108 in a state where the reference track 108 formed on one reference layer 106 is tracked.
  • Sample servo information 112 is formed along a virtual track 111 corresponding to the reference track 108 in a state where the reference track 108 formed on one reference layer 106 is tracked.
  • the reference track 108 of the reference layer 106 corresponding to the recording layer 101 to be formatted is irradiated with a red laser beam, and the reference track 108 is tracked with the red laser beam (step 1 in FIG. 5). ).
  • the blue laser light beam is irradiated onto the recording layer 101 to be formatted in a state where the reference track 108 is tracked with the red laser light beam (step 2 in FIG. 5).
  • focus control is performed on the recording layer 101 to be formatted using reflected light of the blue laser light beam (step 3 in FIG. 5).
  • the reflected light of the blue laser light beam is used to correct the aberration for the recording layer 101 to be formatted (step 4 in FIG. 5).
  • sample servo information 112 is formed with the blue laser light beam along the virtual track 111 on the recording layer 101 corresponding to the reference track 108 in a state where the reference track 108 is tracked with the red laser light beam (step of FIG. 5). 5).
  • the irradiation of the blue laser light beam is moved to the other recording layer 101, and after each focus movement, focus control and aberration correction are performed, the formatting is performed.
  • the recording layer 101 to be formatted is irradiated with a blue laser beam.
  • a blue laser light beam is applied to the correction mark 209 formed on each recording layer 101 (step 2 in FIG. 5 and step 1 in FIG. 6).
  • the light amount or light amount distribution of the light spot is analyzed for the reflected light of the blue laser light beam when the correction mark 209 is scanned (step 2 in FIG. 6).
  • a correction control signal for correcting the aberration is generated from the analysis result of the light spot (step 3 in FIG. 6).
  • the correction control signal is a signal corresponding to the direction in which the aberration is deviated from the surface of the recording layer 101 from the change in the light amount or light amount distribution of the light spot before and after the correction mark 209 is scanned. is there.
  • the aberration is corrected using the correction control signal (step 4 in FIG. 6).
  • the correction of the aberration is performed by moving the optical system used when irradiating the blue laser light beam such as the collimator lens 315 with a correction control signal corresponding to the deviation of the aberration.
  • the correction mark 209 formed on each recording layer 101 is used to correct the aberration each time the light beam moves to the recording layer 101 to be formatted, thereby recording the recording layer. Even if the number of layers 101 is increased, the quality of the light spot applied to the recording layer 101 can be maintained, and the format can be performed satisfactorily.
  • the correction of aberration at the time of formatting has been described.
  • the correction mark 209 is used to correct the aberration. By performing correction, information can be recorded and reproduced satisfactorily.
  • the recording system 101 stores in advance the state of the optical system that optimizes the standard focus and aberration for each recording layer 101. By performing focus control and aberration correction after the recording layer 101 is specified and stored each time the layer 101 is moved, the amount of correction can be made relatively small, so focus control and aberration correction can be performed more easily. It can be performed.
  • the wavelength of the laser light used is about ⁇ 650 nm for the red laser light. It is appropriate that the laser beam is about 30 nm, and the blue laser beam is about ⁇ 30 nm centered on 405 nm.
  • the format device of the present invention will be described with reference to FIGS. 7 to 14, including the configuration of the aberration correction device and the correction method.
  • the formatting device of the present invention is used when formatting the optical recording medium of the first and second embodiments as shown in the third embodiment.
  • the format device includes two laser light sources that irradiate long and short light beams of two wavelengths, an optical system that includes a collimating lens corresponding to each light beam and an objective lens that irradiates the optical disk with the light beam, It comprises a photodetector that generates a correction signal in accordance with the reflected light from the optical disc, and an actuator that performs tracking and focusing under the control of the correction signal to adjust aberration.
  • the format device having such a configuration, while the reference track is tracked by the long wavelength light beam, the short wavelength light beam is formatted by the short wavelength light beam, and the short wavelength light beam is reflected by the reflected light reflected by the correction mark. Adjust aberrations. Thereby, even if the recording layer is an optical recording medium having a multilayered structure, focus position adjustment and aberration correction can be easily performed.
  • FIG. 7 is a diagram illustrating the configuration of the formatting device of the present invention.
  • FIG. 7 is a configuration diagram of an optical system of a formatter apparatus in which an aberration correction apparatus according to the present invention is incorporated in order to format a servo mark on each recording layer of the optical disc 100.
  • the formatter device 300 includes a red laser light source 331 (wavelength 650 nm) for tracking control and a blue laser light source 311 (wavelength 405 nm) for servo mark recording.
  • a red laser optical system an optical system using the blue laser light source 311
  • an optical system using the blue laser light source 311 is referred to as a blue laser optical system.
  • optical characteristics and wavelength characteristics of these laser light sources are arbitrary, it is preferable to satisfy the specifications of laser light sources used for Blu-ray (registered trademark) and DVD.
  • the blue laser light beam emitted from the blue laser light source 311 is collected by a relay lens 312, passes through an AO modulator (Acousto-Optic Modulator) 313 and a polarizing beam splitter 314, and becomes a substantially parallel light beam by a collimator lens 315. .
  • the parallel light beam further passes through the quarter-wave plate 316 and the wavelength separation beam splitter 317 and enters the objective lens 318.
  • the blue laser light beam emitted from the objective lens 318 is reflected by the reference layer 106, traces the optical path in reverse, becomes a polarization plane orthogonal to the forward polarization plane by the quarter wave plate 316, and is reflected by the polarization beam splitter 314.
  • the photodetector 320 generates a focus error signal 321 from the light beam detected by the detection lens 319.
  • the focus error signal 321 is a signal that controls the operation of the focusing coil 322, and the focusing coil 322 moves the objective lens 318 in the optical axis direction according to the light beam detected by the detection lens 319, so that the blue laser light is emitted. This signal is focused on the reference layer 106. Since the focus error signal 321 can be generated by a known method such as an astigmatism method, a detailed description is omitted.
  • the focus can be adjusted to the optimum with respect to the reference layer 106.
  • the reflected light from the recording layer is reflected by the polarization beam splitter 314 and the beam splitter 325, and the photodetector 326 is incident.
  • the light detector 326 analyzes the light quantity or light quantity distribution of the reflected light and outputs a control signal 327 for correction.
  • the actuator 324 moves the collimator lens 315 in the optical axis direction according to the control signal 327 to correct the aberration. Do.
  • the control signal 327 for correction is a signal indicating that the aberration is shifted, or that the aberration is shifted and the direction in which the aberration is shifted, and the actuator 324 indicates the direction indicated by the control signal 327 when the control signal 327 is input. Accordingly, the collimating lens 315 is moved. By performing feedback control of this operation until the aberration converges and the control signal 327 is not output, the aberration is corrected.
  • the red laser light beam emitted from the red laser 331 passes through the polarization beam splitter 332, is made into a substantially parallel light beam by the collimating lens 333, is reflected by the quarter-wave plate 334, and the wavelength separation beam splitter 317, and is reflected by the objective lens. Incident on 318.
  • the objective lens 318 is preliminarily designed in combination with the collimating lens 315 so that the spherical aberration of the red laser light is minimized in the reference layer 106.
  • the NA of the objective lens 318 by red laser light is set to 0.60.
  • An aperture (not shown) is required to limit the NA, and can be formed on, for example, a quarter wave plate 334.
  • the objective lens 318 is provided with a tracking coil 339 and a focusing coil 322 as actuators in the tracking direction and the focusing direction, respectively.
  • the focusing coil 322 is controlled in advance so that the light beam emitted from the red laser light source 331 is focused on the surface of the reference layer 106. Further, the red laser light beam emitted from the objective lens 318 enters the reference layer 106 of the optical disc 100 (outward path) and is reflected by the surface thereof.
  • the optical path of the reflected light beam follows the forward path in reverse, and becomes a polarization plane orthogonal to the polarization plane of the forward path by the quarter-wave plate 334, reflected by the polarization beam splitter 332, passes through the detection lens 335, and passes through the light path.
  • the light enters the detector 336.
  • the focus of the red laser light beam controls the focusing coil 338 based on the focus signal 340 generated by the photodetector 336.
  • the photodetector 336 generates a tracking signal 341 in accordance with the diffraction from the reference track 108 formed in the reference layer 106 and controls the tracking coil 339.
  • the tracking control by the tracking signal 341 may use a known tracking method such as a push-pull tracking method or a phase difference method according to the shape of the reference track 108.
  • blue laser light emitted from the objective lens 318 is irradiated to the same reference layer 106 that is once tracked by the red laser light.
  • the servo layer is moved to the recording layer for recording, so that the blue laser beam emitted from the objective lens 318 can enter the recording layer for recording.
  • a pulse voltage is applied to the focusing coil 322, and a jumping operation is performed from the reference layer 106 to a desired recording layer so that the focus position becomes a predetermined recording layer.
  • the spherical aberration of the objective lens 318 due to the blue laser light is designed to be minimized near the reference layer 106 when collimated parallel light is incident. Therefore, when focusing on the target recording layer, it is necessary to correct the aberration with the blue laser light in accordance with the target recording layer. For this reason, the aberration of the blue laser beam is corrected while focusing on a predetermined recording layer. The aberration is corrected by moving the collimating lens 315 to an optimal position by the actuator 324.
  • the objective lens 318 needs to be set within the focus depth ⁇ d.
  • NA 0.85
  • ⁇ d is about 0.28 ⁇ m. Therefore, when formatting, it is necessary to perform focus control within the focus depth of 0.28 ⁇ m of the blue laser beam in advance.
  • the focus position of the red laser light is between the reference layer 106 and the reference layer 106. Focus error occurs. This is because the distance between the target recording layer and the reference layer 106 differs depending on the location, and the distance between all the recording layers and the reference layer 106 does not fall within the focus depth of the red laser light of the objective lens 318. Derived from.
  • the focus correction coil 338 is controlled based on the focus signal 340 generated by the photodetector 336 to move the collimator lens 333 in the optical axis direction, thereby correcting the focus error of the red laser light.
  • ⁇ d is about 0.90 ⁇ m. It is necessary to control the focus of the red laser light within a focus depth of about 0.90 ⁇ m.
  • a method for formatting the optical disc 100 using this formatter device will be described. While following the reference track of the reference layer 106 with red laser light, a format for forming servo marks constituting sample servo information on the recording layer with blue laser light is performed. The servo mark is written along a virtual track (hereinafter referred to as a temporary track) of each recording layer corresponding to the reference track 108 of the reference layer 106.
  • a virtual track hereinafter referred to as a temporary track
  • the center of the virtual track corresponding to the reference track 108 and the inner peripheral side and the outer peripheral side in the direction perpendicular to the virtual track from the center.
  • the servo mark is written at the offset position, and the actual data is recorded with reference to the center of the servo mark, that is, the center of the virtual track.
  • an AO modulator 313 As a method of writing servo marks with an offset, for example, an AO modulator 313 is used.
  • the blue laser light emitted from the blue laser light source 311 is collected by the relay lens 312 and is incident on the AO modulator 313.
  • the blue laser light is diffracted and collimated by the collimating lens 315 via the polarization beam splitter 314.
  • the diffraction angle of the AO slightly changes according to the modulation frequency, and the servo is moved to a position slightly displaced from the center of the virtual track. A mark is formed. If the track pitch is 0.32 ⁇ m, which is the same as that of the Blu-ray disc (registered trademark), the modulation frequency may be set so that this displacement is about 0.08 ⁇ m.
  • the blue laser beam detects the focus error signal 321 with the reproduction level power, and improves the laser beam intensity to the recording power only when the servo mark is recorded.
  • the focus servo is not affected because the blue laser beam output is at the recording power for only a short time. However, if the drive signal is saturated and adversely affected, the gate is only recorded while the focus error signal is being recorded. Then, it may be processed as a hold or no signal.
  • each recording layer does not have an address or the like, it is necessary to specify which recording layer is recording.
  • Each recording layer is formed with a correction mark 209 (see FIG. 2).
  • the correction mark 209 is a reference layer reference position, such as a land groove switching point or a specific clock.
  • each recording layer can be shifted in the circumferential direction so as to be separated by a certain angle ⁇ with respect to a position 230 corresponding to (see FIG. 2). Therefore, the recording layer can be specified by measuring the angle from the reference position 230 (see FIG. 2) to the correction mark 209 (see FIG. 2).
  • a servo mark can be freely formed on a desired recording layer in accordance with a reference track.
  • the correction of the aberration will be described in detail with reference to FIGS. 7 to 9, taking as an example the case of correcting the spherical aberration due to the disc thickness.
  • FIG. 8 is a diagram for explaining the concept of correcting the spherical aberration due to the disc thickness
  • FIG. 9 is a diagram for explaining the configuration of the photodetector of the present invention.
  • FIG. 8A shows the relationship between the disc thickness error ⁇ t and the third-order spherical aberration WSA.
  • the spherical aberration WSA caused by the optical disk thickness error ⁇ t cannot be corrected by focus correction.
  • the spherical aberration WSA is related to a decrease in central energy density SD (Stretch Definition), which is a condensing characteristic of the light beam by the objective lens.
  • a Marechal allowable value W ⁇ 0.07 ⁇ in which the central energy density is generally about 80% is applied, and from an empirical value of aberration distribution, a WSA of about 0.02 ⁇ or less is appropriate.
  • ⁇ t needs to be 4 ⁇ m or less.
  • a spacer layer having translucency requires a certain distance to avoid noise due to multiple interference of light beams, and a value of about 5 to 14 ⁇ m is usually selected, and multiple interference can be caused by changing the thickness of the adjacent spacer layer.
  • the thickness of the spacer layer is larger than the tolerance of the optical disk thickness, and correction of spherical aberration is indispensable every time recording or reproduction is performed on a different layer.
  • the spherical aberration is corrected by moving the collimator lens 315 in the optical axis direction and changing the curvature of the wavefront incident on the objective lens 318.
  • FIG. 8B shows spherical aberration WSA that occurs when the collimating lens 315 is moved in the optical axis direction. From this, it can be seen that the third-order spherical aberration WSA caused by the disc thickness error can be corrected by moving the collimating lens 315 in the optical axis direction. That is, when there is a disc thickness error ⁇ t, the generated spherical aberration is WSA 0 from FIG. 8A, but by moving the collimating lens 315 by ⁇ in the optical axis direction, spherical aberration is generated by ⁇ WSA 0 . Therefore, the spherical aberration due to the disc thickness can be corrected.
  • the spherical aberration WSA generated by the disc thickness error ⁇ t can be detected, it can be understood that the spherical aberration can be corrected by moving the collimating lens 315 in the optical axis direction by a corresponding distance.
  • FIG. 9 is a diagram illustrating the configuration of the photodetector 326 shown in FIG. 7 for detecting aberrations.
  • the aberration detection light beam is split by the beam splitter 325 and enters the photodetector 326.
  • the incident light beam 371 is divided by the photodetector 326 into four detection regions 1, 2, 3, and 4 by a concentric circular dividing line 373 and a dividing line 372 divided in the diameter direction, for example, vertically.
  • the photodetector 326 includes a differential amplifier 374 or a summing amplifier 378, or both amplifiers as shown in the figure, and when detecting aberrations, any one of the mounted amplifiers is used for detection.
  • the addition amplifier 378 further includes a differentiation circuit 376, and the addition output 379 from the addition amplifier 378 is output as a differentiation output 380 via the differentiation circuit 376.
  • the actuator 324 is operated to move the collimating lens 315 so that the differential output 380 is maximized, thereby correcting the aberration. That is, when correcting the aberration using the addition amplifier 378, first, the correction mark 209 (see FIG. 2) is scanned with a light beam.
  • an addition amplifier 378 and a differentiation circuit 376 detect a change in the amount of reflected light when scanning the front and back of the edge portion of the correction mark 209 (see FIG. 2).
  • the summing amplifier 378 adds the total amount of reflected light, differentiates the output by the differentiating circuit 376, and outputs the change in the amount of light per unit time as a differential output 380 that is a control signal for correction.
  • the actuator 324 is driven in accordance with the differential output 380 to move the collimating lens 315 so that the level of the differential output 380 is maximized to correct the aberration.
  • the differential output level at the time sampled by the sampling clock is stored in the memory and compared with the differential output level at the next sampled time, and the difference It is also possible to control by repeating until the difference becomes zero.
  • the storage device and the comparison device are omitted in the figure.
  • the differential output 375 is output from the differential amplifier 374.
  • the differential output 375 is adjusted to zero. That is, the differential output 375 is a differential output of the total light amount of the region 1 and the region 4 and the total light amount of the region 2 and the region 3.
  • the differential output 375 becomes 0, and the differential output 375 is
  • the actuator 324 is operated at a value other than 0, the collimator lens 315 is moved so that the differential output 375 becomes 0 to correct the aberration.
  • FIG. 10 is a diagram for explaining the analysis result of the addition amplifier output and the differential output of the reflected light when passing through the correction mark.
  • 11 to 13 are diagrams for explaining the analysis results of the differential amplifier output of the reflected light when passing through the correction mark.
  • FIG. 10A shows the disk transmittance in the recording layer from which the correction mark 209 is read out after scanning the light beam from the reference position 230 of the reference layer and after the time value t m .
  • the addition amplifier 378 outputs the increase or decrease light quantity of the light beam 371, and the differentiation circuit 376 outputs the ratio of the increase or decrease light quantity per unit time as the differential output 380.
  • the aberration decreases as the differential output 380 increases.
  • the actuator 324 is operated so that the blue laser light is focused on the target recording layer, and the collimator lens 315 is moved so as to increase the differential output 380 as a correction control signal, thereby correcting the aberration.
  • the added output 379 has a gentle waveform as shown in FIG. 10B even if focus adjustment is performed.
  • the differential output 380 at this time is also small as shown in FIG.
  • the collimating lens 315 is moved in the direction of the optical axis, and an addition output 379 and a differential output 380 are obtained.
  • the position of the collimating lens 315 at this time is the position where the spherical aberration of the light beam is minimum. Specifically, this is the point at which the aberration in the circumferential direction of the light beam is minimized, and the smallest spot is detected in the circumferential direction of the optical disk.
  • This method is the most reliable method for obtaining the minimum aberration and the best focus position.
  • the position correction of the collimator lens may be repeatedly performed so that the differential output is maximized during formatting or information recording / reproduction in response to a focus position shift caused by a slight lateral movement of the optical axis.
  • the control for correction of the differential output 380 and the like from the change rate of the light quantity reflected by the edge of the correction mark.
  • FIG. 11 to FIG. 13 show a state in which the light spot passes through an edge that is an outer periphery parallel to the radial direction of the recording layer of the correction mark 209.
  • FIG. 11 is a diagram illustrating the analysis result of the light quantity distribution in the absence of aberration
  • FIGS. 12 and 13 are diagrams illustrating the analysis result of the light quantity distribution in the presence of aberration
  • FIG. 14 is the differential output and spherical aberration. It is a figure which shows the relationship.
  • the blue laser light emitted from the objective lens 318 is reflected by the recording layer having the correction mark 209, passes through the objective lens 318 again, is collected by the condenser lens 381, and enters the photodetector 326.
  • the objective lens 318 is developed on the going side and the returning side with the recording layer as the center, and the condenser lens 381 combines the collimating lens 315 and the detecting lens 319 of FIG. It is schematically shown as a thing.
  • FIGS. 11 (a), 12 (a), and 13 (a) show the light quantity distribution of the reflected light input to the photodetector 326 immediately before the light spot passes through the edge of the correction mark 209.
  • FIG. FIGS. 11B, 12B, and 13B show the light amount distribution of the reflected light input to the photodetector 326 at the moment when the center of the light spot passes the edge of the correction mark 209.
  • FIG. 11C, 12C, and 13C show the light quantity distribution of the reflected light input to the photodetector 326 immediately after the light spot passes through the edge of the correction mark 209.
  • FIG. 11D, 12D, and 13D show the differential output 375 corresponding to the above (a), (b), and (c) while the light beam crosses the correction mark 209.
  • FIG. 11 shows a state in which the light spot passes through the edge when the spherical aberration is minimum.
  • the light amount distribution changes almost instantaneously when the light spot passes through the edge of the recording film. Therefore, almost all the light amount of the light spot is incident until the light spot passes through the edge of the correction mark 209 as shown in FIG. 11A, and the light spot becomes the correction mark 209 as shown in FIG.
  • the differential output may generate a pulse instantaneously. However, since the output changes uniformly over the entire spot, the differential output 375 becomes substantially zero. .
  • FIG. 12 schematically shows spherical aberration that occurs when the recording layer becomes thinner than a predetermined thickness.
  • the focus position is drawn to the position of the smallest circle of confusion where the size of the light spot is minimum, and the focus position on the outer peripheral side of the light spot is on the inner peripheral side of the light spot before the recording layer.
  • the focus position shifts to the position after being reflected by the recording layer.
  • the edge of the correction mark 209 shields the outer side light beam, and then starts to block the opposite inner side light beam. There appears a change in the light distribution that oozes out to the area on the opposite side of the dividing line.
  • the correction mark 209 shields the light spot in the order of region 4, region 1, region 2, and region 3 in FIG.
  • the shielded portion becomes the region 4 and the region 1, and is inverted between the outer peripheral side and the inner peripheral side.
  • the shielded area reaches the area 2 and the area 3 as shown in FIG. Accordingly, as shown in FIG. 12D, a differential output 375 that is maximized at the moment when the center of the light spot passes the edge of the correction mark 209 is obtained.
  • the polarity of the output of the opposite edge is inverted, so either one of the outputs is used, or the polarity of the output of the opposite edge is switched and added for correction. Can be used as a control signal.
  • FIG. 13 schematically shows spherical aberration that occurs when the disc becomes thicker than a predetermined thickness.
  • the focus position is drawn to the position of the smallest circle of confusion where the size of the light spot is minimum, and the focus position on the inner periphery side of the light spot is on the outer periphery side of the light spot before the recording layer.
  • the focus position shifts to the position after being reflected by the recording layer.
  • the edge of the correction mark 209 shields the outer peripheral light beam opposite to FIG. 12A, and then the opposite side.
  • the light distribution changes so as to begin to shield the inner peripheral light beam and ooze out into the region opposite to the two-part dividing line.
  • the correction mark 209 shields the light spot in the order of region 3, region 2, region 1, and region 4 in FIG.
  • the shielded portions are the regions 2 and 3, and the shield portions are opposite to those in FIG. 12 (b). Inverted on the outer peripheral side and inner peripheral side.
  • the shielded area extends to the areas 1 and 4 as shown in FIG. Accordingly, as shown in FIG. 13D, a differential output 375 that maximizes at the moment when the center of the light spot passes the edge of the correction mark 209 is obtained. Since the polarity of the output of the opposite edge is inverted, only one of the outputs can be used, or the polarity of the output of the opposite edge can be switched and added to be used as a control signal for correction.
  • FIG. 14 schematically shows the spherical aberration caused by the disc thickness error on the horizontal axis and the differential output 375 at that time on the vertical axis.
  • the spherical aberration can be detected from the differential output 375 relatively linearly. Accordingly, the spherical aberration can be corrected by moving the collimator lens 315 in the optical axis direction by the actuator 324 based on this output.
  • the focus and spherical aberration can be optimized using the edge of the correction mark 209, and the servo mark can be used even in a multilayer recording medium. It can be satisfactorily formed on the recording layer of the optical disc, and good information can be recorded and reproduced. Further, the recording layer can be specified by forming the correction mark 209 by shifting the correction mark 209 in the circumferential direction for each recording layer.
  • the reference layer is one layer
  • the present invention can be similarly applied to a case where a plurality of reference layers are provided, and an optical recording including two reference layers on which a reverse spiral reference track is formed. It can also be used for formatting media. If the correction marks 209 are provided on the inner and outer peripheral sides of the recording layer, it is possible to speed up focus adjustment and aberration correction when moving the light beam between the inner and outer peripheral sides.
  • the optical disk to be used has a reference layer
  • the present invention can also be applied to the case where the optical disk to be used does not have a reference layer.
  • the correction mark 209 of the recording layer closest to the surface or the recording layer farthest from the surface in the multilayer optical disc is detected, and the other recording layers can be specified by using this recording layer as a reference. It can be carried out. Further, the focus and spherical aberration can be optimized by using the edge of the correction mark 209 in these recording layers.
  • FIG. 15 is a diagram exemplifying a main part of a device configuration relating to correction at the time of recording / reproducing of the present invention.
  • a case where blue laser light is used as laser light for recording / reproducing will be described as an example.
  • the blue laser light beam emitted from the blue laser light source 311 passes through the polarization beam splitter 314, is made into a substantially parallel light beam by the collimator lens 315, and enters the objective lens 318.
  • the light beam emitted from the objective lens 318 enters the optical disc 100.
  • the blue laser light beam incident on the optical disc 100 is applied to the reference layer 106 or the recording layer.
  • the spherical aberration of the objective lens 318 for the blue laser light is minimized in the vicinity of the reference layer 106 when collimated parallel light is incident. Since it is designed, first, the reference layer 106 is irradiated with the blue laser light beam through the above-described path. The light beam reflected by the reference layer 106 follows the optical path in the reverse direction, is reflected by the polarization beam splitter 314, passes through the detection lens 319, is transmitted or reflected by the beam splitter 325, and is detected by the photodetector 320 and the photodetector 326. Is incident on.
  • focus control and tracking control are performed by the output of the photodetector 320, and an aberration correction signal is generated by the output of the photodetector 326 to perform aberration correction. Since a technique for generating a focus control signal related to recording / reproduction and performing a focus control and a technique for generating a tracking control signal from sample servo information and performing a tracking control are already well-known techniques, description thereof is omitted here.
  • the position 230 serving as a reference of the reference layer 106 and necessary information are once read with the blue laser light, and then moved to the target recording layer by a jumping operation.
  • the recording layer is directly irradiated with a blue laser light beam, focus control, tracking control, aberration correction, and the number of recording layers can be determined, access to the reference layer 106 is unnecessary.
  • the positions of the objective lens 318 and the collimating lens 315 that can be focused for each recording layer can be recorded and controlled in advance, the focus is not directly focused on the reference layer 106, but the target recording layer is directly subjected to focus control and aberration correction. It can be carried out.
  • the target recording layer to be recorded / reproduced is irradiated with blue laser light
  • the focus error signal 321 is obtained from the output of the photodetector 320
  • the objective lens 318 is moved by the focusing actuator 322 to focus on the target recording layer.
  • the spherical aberration of the objective lens 318 with respect to the blue laser light is designed to be minimized in the vicinity of the reference layer 106 when collimated parallel light is incident. Therefore, it is necessary to adjust the aberration.
  • the aberration is adjusted by moving to the position of the collimator lens 315 recorded in advance and roughly correcting the aberration, then scanning the correction mark 209 of the target recording layer, and the light quantity or light quantity distribution from the output of the photodetector 326. Is generated to generate a precise control signal 327 for correction, and the actuator 324 is driven in accordance with the control signal 327 for correction to finely adjust the collimating lens 315 in the optical axis direction to correct the aberration.
  • the sample servo information of the recording layer is tracked with the blue laser light beam, and information is recorded / reproduced with the blue laser light beam.
  • a well-known method may be used as a method of tracking the blue laser light based on the sample servo information.
  • the correction mark 209 used at that time is not limited to the presence or absence of the recording film, but is reflected by a dent or a hole. You may form by the pattern from which a rate changes.
  • the correction beam 209 is irradiated with the light beam, and the reflected light is analyzed by the photodetector 326 to correct the control signal. 327, and correction of aberrations such as spherical aberration using the correction control signal 327, the sample servo information of each recording layer can be obtained even in an optical recording medium composed of multiple recording layers. Information can be recorded and reproduced satisfactorily while reading.
  • the reference layer having the tracking reference track is not necessarily built in the optical disc 100. If the reference layer is formed so as to rotate integrally with the optical disc when the optical disc is formatted, the reference layer is not necessarily recorded. It is not necessary to be laminated together with the layers, and for example, it can be provided outside a turntable or the like.
  • a reference layer is provided on a turntable, and an optical disc without a reference layer is fixed in close contact with the reference layer.
  • the blue laser light is condensed on the recording layer of the optical disc 100 by the objective lens, and the red laser light is condensed on the reference layer on the turntable to perform the format while performing tracking control.
  • the above-described methods are used for focus control to the recording layer by the blue laser light, correction of spherical aberration, tracking control to the reference layer by the red laser, and focus control.
  • the number of reference layers 106 and the spiral direction of sample servo information are arbitrary.
  • a similar formatting device can also be used.
  • correction can be performed without providing pre-bits or the like that must measure jitter for adjusting the focus position, spherical aberration, and other aberrations in each recording layer.
  • the focus position and spherical aberration of the light beam in each layer can be adjusted using the edge of the mark for use.

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  • Optical Recording Or Reproduction (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

Dans un support d'enregistrement optique dans lequel sont stratifiées une couche de référence (106) comprenant des pistes de référence (108) et une pluralité de couches d'enregistrement plates (101) sur lesquelles sont formées des informations d'asservissement d'échantillons, une marque de correction (209) est prévue dans chacune des couches d'enregistrement (101), la marque de correction ayant une réflectivité différente de celle des parties environnantes. Cela permet d'effectuer facilement une correction d'aberration en utilisant les marques de correction (209) lors du formatage ou lors de l'enregistrement/la reproduction d'informations.
PCT/JP2012/006796 2012-10-24 2012-10-24 Support d'enregistrement optique, dispositif de format et procédé de formatage Ceased WO2014064733A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0660460A (ja) * 1992-08-04 1994-03-04 Sharp Corp レーザー光の案内板およびこれを用いた光記録媒体のフォーマッティング方法および光磁気記録再生装置
JP2005122862A (ja) * 2003-10-20 2005-05-12 Pioneer Electronic Corp 多層光記録媒体および光ピックアップ装置
WO2008120354A1 (fr) * 2007-03-29 2008-10-09 Pioneer Corporation Procédé de fabrication d'un support d'enregistrement optique multicouche et dispositif d'enregistrement optique multicouche

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0660460A (ja) * 1992-08-04 1994-03-04 Sharp Corp レーザー光の案内板およびこれを用いた光記録媒体のフォーマッティング方法および光磁気記録再生装置
JP2005122862A (ja) * 2003-10-20 2005-05-12 Pioneer Electronic Corp 多層光記録媒体および光ピックアップ装置
WO2008120354A1 (fr) * 2007-03-29 2008-10-09 Pioneer Corporation Procédé de fabrication d'un support d'enregistrement optique multicouche et dispositif d'enregistrement optique multicouche

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Title
MASAKAZU OGASAWARA: "16 layers Write Once Disc with a Separated Guide Layer", TECHNICAL REPORT OF IEICE, 4 March 2011 (2011-03-04), pages 1 - 6 *

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