WO2004066289A1 - 情報記録媒体及び情報記録装置 - Google Patents
情報記録媒体及び情報記録装置 Download PDFInfo
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- WO2004066289A1 WO2004066289A1 PCT/JP2003/016811 JP0316811W WO2004066289A1 WO 2004066289 A1 WO2004066289 A1 WO 2004066289A1 JP 0316811 W JP0316811 W JP 0316811W WO 2004066289 A1 WO2004066289 A1 WO 2004066289A1
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- servo control
- tracking servo
- offset value
- light beam
- control device
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- 230000001678 irradiating effect Effects 0.000 claims abstract description 14
- 238000001514 detection method Methods 0.000 claims description 42
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- 238000012937 correction Methods 0.000 claims description 14
- 230000015572 biosynthetic process Effects 0.000 claims description 13
- 230000003287 optical effect Effects 0.000 abstract description 117
- 230000008859 change Effects 0.000 description 63
- 238000010586 diagram Methods 0.000 description 31
- 238000005259 measurement Methods 0.000 description 18
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000009751 slip forming Methods 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 241000282376 Panthera tigris Species 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 235000009991 pite Nutrition 0.000 description 1
- 244000293655 pite Species 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
Classifications
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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
- G11B7/08—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
- G11B7/08—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
- G11B7/0901—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 for track following only
-
- 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
- G11B7/094—Methods and circuits for servo offset compensation
-
- 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
- G11B7/007—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
- G11B7/00745—Sectoring or header formats within a track
-
- 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
- G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
- G11B7/24085—Pits
Definitions
- This effort is based on the tracking servo control device, tracking servo control method and description.
- the present invention relates to a program for controlling a laquinda service.
- Some recording optical discs have address signals that are pre-formed on land tracks as LPPs (land pre-pits).
- LPPs laand pre-pits
- LP signals are generated by group deformation.
- information pits may be formed near the LPP, or information pits recorded near the LPP may be reproduced. Further, as a method of detecting the position on an optical disc of an information pit read erroneously as a reproduced signal, a technique of performing error detection and correction using an ECC block disclosed in Patent Document 3 is known.
- Patent Document 3 Japanese Patent Application Laid-Open No. 2002-202919
- the problems to be solved by the present invention include a tracking offset value for an optical disc having an LPP and a group track so that an accurate reproduction signal can be obtained.
- One example is to provide a tracking servo control device, a tracking servo control method, a tracking servo control program, and an information recording medium for tracking servo control that set the following.
- the present invention provides a tracking controller that performs tracking servo control for irradiating a light beam onto a group track on a recording medium such as an optical disk in which groove tracks and prepits are formed in advance.
- a control unit configured to generate a first reproduction signal based on reflected light from the recording medium when at least a part of the pre-pit is formed within an irradiation range of the light beam onto the group track.
- a first generating unit such as a CPU for generating a second reproduction signal based on reflected light from the recording medium when the prepit is formed outside the irradiation range of the light beam; (2) calculating an offset value in the tracking servo control based on the generated first reproduction signal and the second reproduction signal.
- a calculation means such as a CPU.
- the calculating means is configured so that a difference between an amplitude value of the first reproduction signal and an amplitude value of the second reproduction signal is minimized.
- the offset value is calculated.
- the tracking offset value is changed so as to minimize the change in the amplitude of the reproduction signal and the reproduction signal based on the reflected light when the LPP is formed outside the irradiation range,
- the tracking offset value it is possible to configure a tracking servo control device that minimizes the number of errors in the reproduced signal.
- a tracking servo control device is characterized in that the calculating means includes a lower peak value of the first reproduction signal and a lower peak value of the second reproduction signal.
- the method is characterized in that the offset value is calculated so that the difference from the value is minimized.
- the tracking offset value is changed so as to minimize the change between the bottom value of the reproduction signal and the bottom value of the reproduction signal based on the reflected light when the LPP is formed outside the irradiation range. This makes it possible to configure a tracking servo control device that minimizes the number of errors in the reproduced signal.
- the calculating means is configured to minimize a difference between an upper peak value of the first reproduced signal and an upper peak value of the second reproduced signal.
- the offset value is calculated.
- the change between the pot value and the peak value of the reproduction signal and the bottom value and the peak value of the reproduction signal based on the reflected light when the LPP is formed outside the irradiation range is minimized.
- the arithmetic means includes: an error number of information obtained from the first reproduction signal; and an error count of information obtained from the second reproduction signal.
- the offset value is calculated such that a value obtained by adding the number of errors is minimized.
- the number of errors of the sum of the number of errors occurring in the reproduction signal and the number of errors occurring in the reproduction signal based on the reflected light when the LPP is formed outside the irradiation range is minimized.
- the present invention provides a tracking servo control device that performs tracking servo control for irradiating a light beam onto a group track on a recording medium on which a groove track and a prepit are formed in advance,
- First generating means for generating a first reproduction signal based on the reflected light from the recording medium; and at least a part of the prepit adjacent to the information pit in another direction within the irradiation range of the light beam.
- a second generation unit that generates a second reproduction signal based on the reflected light from the recording medium when the first reproduction signal and the second reproduction signal are generated.
- Calculating means for calculating an offset value in tracking servo control.
- the reproduction signal based on the reflected light from the optical disc and the reproduction signal in the other direction Tracking servo control that minimizes the number of errors in the reproduced signal by changing the tracking offset value using the reproduced signal based on the reflected light from the optical disk when at least a part of the adjacent LPP is formed.
- the calculating means is configured such that a difference between an amplitude value of the first reproduction signal and an amplitude value of the second reproduction signal is minimized. And calculating the offset value.
- the change in amplitude between the reproduced signal and the reproduced signal based on the reflected light from the optical disk when at least a part of the LPP adjacent in the other direction is formed is minimized.
- a tracking servo control device of the present invention provides a third control based on reflected light of the light beam from the recording medium when the pre-pit is formed outside the irradiation range.
- a third generation unit that generates a reproduction signal, wherein the control unit includes an upper peak value of the third reproduction signal, an upper peak value of the first reproduction signal, and an upper peak value of the second reproduction signal.
- the offset value is calculated so that the difference between the average value and the minimum value is minimized.
- the peak value of the reproduction signal and the reflected light from the optical disk when at least a part of the LPP adjacent in the other direction is formed are obtained.
- the tracking offset value is set so that the average of the amount of change from the peak value of the reproduced signal is the smallest relative to the peak value of the reproduced signal when the LPP is not included in the light beam irradiation range. This makes it possible to configure a tracking servo control device that minimizes the number of errors in the reproduced signal.
- the tracking servo control device of the present invention provides a third control based on the reflected light of the light beam from the recording medium when the pre-pit is formed outside the irradiation range.
- a third generation unit that generates a reproduction signal, wherein the calculation unit includes a lower peak value of the third reproduction signal, a lower peak value of the first reproduction signal, and a lower side of the second reproduction signal.
- the offset value is calculated such that the difference between the average value and the peak value is minimized.
- the peak value and the potom value of the reproduced signal and the peak value of the reproduced signal based on the reflected light from the optical disk when at least a part of the LPP adjacent in the other direction are formed.
- the arithmetic means includes: a lower peak value of the third reproduction signal; a lower peak value of the first reproduction signal; The offset value is calculated so that the difference between the average value of the reproduced signal and the lower peak value is minimized.
- the peak value and the bottom value of the reproduction signal and the peak value and the bottom value of the reproduction signal based on the reflected light from the optical disk when at least a part of the LPP adjacent in the other direction are formed.
- a tracking servo control device of the present invention has the following configuration. 2003/016811
- the calculating means calculates the offset value such that a value obtained by adding the number of data errors obtained from the first reproduced signal and the number of data errors obtained from the second reproduced signal is minimized. It is characterized by doing.
- the number of errors occurring in the reproduction signal, and the number of errors occurring in the reproduction signal based on the reflected light from the optical disk when at least a part of the LPP adjacent in the other direction is formed.
- the tracking offset value is changed so that the number of errors in the sum of the two is minimized, and the tracking offset value is used. This makes it possible to configure a tracker servo controller that minimizes the number of errors in reproduced signals.
- the tracking servo control device is characterized in that the calculation of the offset value by the calculation means includes calculating the information pits formed in a continuous area where the information pits are to be formed. It is characterized by being calculated using According to the present invention, the optimum tracking offset value can be detected at high speed.
- a tracking servo control device wherein the calculation of the offset value by the calculation means is performed using the information pits formed in a linking area of the recording medium.
- the optimum tracking offset can be performed without making the user aware of the detection time of the optimum tracking offset value.
- the tracking servo control device is configured such that the calculation of the offset value by the calculating means is performed in a predetermined region formed in order to adjust the light amount of the light beam. It is characterized by being calculated using information pits.
- the detection of the optimum tracking offset value can be performed when the tracking service control device is started. Further, the optimum tracking offset value can be detected regardless of whether the medium is a recordable medium or a recordable medium.
- a tracking servo control apparatus wherein the calculation of the offset value by the calculating means includes a recording medium on which the information pits for which error detection and correction are performed by an error detection and correction code are formed. Before formed in one area The calculation is performed using the information pit.
- ECC can be used for detecting the optimum tracking offset value, and the optimum tracking offset value can be detected with a simpler configuration.
- a tracking servo control device is characterized in that the information pit formation pattern is constant.
- the formation pattern of the information pit is constant, it is possible to easily detect the optimum tracking offset value.
- the tracking servo control device is arranged such that the information pit is an information pit used for recording information recorded with an error detection and correction code, The position on the recording medium is specified by the error detection and correction code.
- the formation pattern of the information pit is constant, it is possible to easily detect the optimum tracking offset value.
- the present invention provides a tracking servo control method for performing a tracking servo control for irradiating a light beam onto a groove track on a recording medium on which a groove track and a prepit are formed in advance.
- the reproduction signal based on the reflected light of the light beam from the optical disk and the LPP outside the irradiation range it is possible to provide a tracking servo control method that minimizes the number of errors in the reproduced signal by changing the tracking offset value by using the reproduced signal based on the reflected light when it is formed.
- the present invention relates to a tracking servo control method for performing tracking servo control for irradiating a light beam onto a groove track on a recording medium on which a group track and prepits are formed in advance.
- the light reflected from the recording medium when at least a part of the prepit adjacent to the information pit in one direction is formed within the irradiation range of the light beam on the group track.
- a first generation step of generating a first reproduction signal by using the recording medium when at least a part of the pre-pits adjacent in the other direction of the information pits is formed in the irradiation range.
- the present invention when at least a part of the LPP adjacent to the information pit in one direction is formed within the irradiation range of the light beam, the reproduction signal based on the reflected light from the optical disc and the other A tracking servo that minimizes the number of errors in the reproduced signal by changing the tracking offset value using the reproduced signal based on the reflected light from the optical disk when at least a part of the LPP adjacent in the direction is formed It is possible to provide a control method.
- the present invention relates to a tracking servo control device that performs tracking servo control for irradiating a light beam onto a group track on a recording medium on which a group track and a pre-pit have been formed in advance.
- a first reproduction signal is generated based on reflected light from the recording medium when at least a part of the pre-pit is formed within the irradiation range of the light beam onto the group track.
- a first generation unit that generates a second reproduction signal based on reflected light from the recording medium when the prepit is formed outside the irradiation range of the light beam; Calculating means for calculating an offset value in the tracking servo control based on the first reproduced signal and the second reproduced signal. It is characterized by functioning as
- At least one of the LPPs falls
- the tracking offset value is changed by using the reproduction signal based on the reflected light of the optical beam from the optical disk when the part is formed and the reproduction signal based on the reflected light when the LPP is formed outside the irradiation range.
- the present invention is included in a tracking servo control device that performs tracking servo control for irradiating a light beam onto a group track on a recording medium on which a groove track and prepits are formed in advance.
- the computer to be reflected from the recording medium when at least a part of the pre-pit adjacent to the information pit in one direction is formed within the irradiation range of the light beam on the group track.
- First generating means for generating a first reproduction signal based on light, wherein the at least a part of the prepits adjacent to the information pit in another direction is formed within an irradiation range of the light beam;
- Second generating means for generating a second reproduced signal based on the reflected light from the recording medium, the first reproduced signal and the second It is characterized by functioning as calculating means for calculating an offset value in the tracking servo control based on a reproduction signal.
- the reproduction signal based on the reflected light from the optical disk when at least a part of the LPP adjacent to the information pit in one direction is formed within the irradiation range of the light beam.
- FIG. 1 is a block diagram showing the information recording / reproducing apparatus of the first embodiment.
- FIG. 2 is a schematic diagram of an RF signal waveform.
- (A) is when the tracking offset value is 0.086 ⁇
- (b) is when the tracking offset value is 0 jam
- (c) is when the tracking offset value is +0.086 ⁇ .
- FIG. 3 is a diagram showing the positional relationship between the light beam irradiation area and the LPP.
- (A) shows the case where the tracking offset value is 0.086 / zm
- (b) shows the case where the tracking offset value is 0 / zm
- (c) shows the case where the tracking offset value is + 0.086 / m. .
- FIG. 4 is a diagram showing the relationship between the amount of RF change and the number of PI (inner parity) errors.
- FIG. 5 is a diagram showing a flowchart for detecting an optimum tracking offset value.
- FIG. 6 is a diagram showing a flowchart for detecting a high-speed optimum tracking offset value.
- FIG. 7 is a diagram showing a positional relationship between LPP and a light beam irradiation area.
- FIG. 8 is a diagram showing the relationship between the tracking offset value and the RF signal waveform.
- (a) shows a case where the tracking offset value is 0.086 m
- (b) shows a case where the tracking offset value is 0 ⁇
- (c) shows a case where the tracking offset value is +0.086 ⁇ .
- FIG. 9 is a diagram showing a positional relationship between the LPP and the light beam irradiation area.
- FIG. 10 is a diagram showing the relationship between the tracking offset value and the RF signal waveform.
- (a) shows a case where the tracking offset value is 0.086 ⁇
- (b) shows a case where the tracking offset value is 0 ⁇
- (c) shows a case where the tracking offset value is +0.086 ⁇ .
- FIG. 11 is a diagram illustrating the relationship between the RF change amount and the number of ⁇ I errors.
- FIG. 12 is a diagram showing a tracking offset value detection flowchart.
- FIG. 13 is a diagram showing a block of the information recording / reproducing device of the third embodiment.
- FIG. 14 is a diagram illustrating a flowchart for detecting an optimum tracking offset value according to the third embodiment.
- FIG. 15 shows the RF signal S f and the gate signal S g at the outside L ⁇ ⁇ of the third embodiment.
- FIG. 1 is a diagram showing a relationship between a peak value and a bottom value.
- FIG. 16 shows the RF signal S f and the gate signal S g in the inner LPP of the third embodiment.
- FIG. 2 is a diagram showing a relationship between a peak value and a bottom value.
- FIG. 17 is a diagram showing an optimum tracking offset value detection block.
- FIG. 18 is a diagram showing the relationship between the tracking offset value and the number of data errors.
- FIG. 19 is a diagram showing the relationship between the tracking offset value and the number of data errors. (a) shows the number of errors in the inner LPP, (b) shows the number of errors in the outer LPP, and (c) shows the total number of errors in the inner LPP and the outer LPP.
- FIG. 20 is a diagram showing a flowchart for obtaining an optimum tracking offset value in the fourth embodiment.
- FIG. 21 is a diagram showing a flowchart for creating a tracking offset reference table.
- FIG. 22 is a diagram showing the relationship between the tracking offset value and the number of data errors.
- FIG. 23 is a graph showing the relationship between the tracking offset value and the number of data errors.
- (A) represents the inner LPP
- (b) represents the outer LPP
- (c) represents the total error number of the inner LPP and the outer LPP.
- FIG. 24 is a diagram showing a flowchart for detecting the optimum tracking offset value in the linking area based on the number of errors.
- FIG. 25 is a diagram showing a flowchart for detecting the optimum tracking offset value in the linking area based on the amplitude.
- FIG. 1 is a block diagram showing the information recording / reproducing apparatus of the present embodiment.
- the information recording / reproducing apparatus of this embodiment includes an optical pickup 2, an RF amplifier circuit 3, an LPP detection circuit 4, a gate circuit 5, a binarization circuit 6, an equalizer circuit 7, an RF amplitude measurement circuit 8, a CPU 9, It is composed of a power circuit 10 and an actuator drive circuit 11.
- a tracking control signal Sa is sent from the CPU 9 to the tracking servo circuit 10, and the tracking servo circuit 10 is actuated by the actuator drive circuit 1 based on the tracking control signal Sa. 1 to the actuator drive circuit 11 based on the control signal Sc. 2 is driven to move the optical pickup 2 to a desired position on the optical disc 1.
- the information signal Sc is sent from the CPU 9 to the optical pickup 2, and the optical disk 1 is irradiated with the light beam 12 based on the information signal Sc sent to the optical pickup 2, and the information pit is formed on the optical disk 1. It is formed.
- a tracking control signal Sa is sent from the CPU 9 to the tracking servo circuit 10, and the tracking servo circuit 10 operates based on the tracking control signal Sa.
- the control signal Sb is sent to 11 and the actuator drive circuit 11 drives the optical pickup 2 based on the control signal S and moves the optical pickup 2 to a desired position on the optical disc 1.
- the optical pickup 2 irradiates the optical disk 1 with the light beam 12, reflected light corresponding to the presence or absence of information pits is generated. The reflected light is converted from light into an electric signal in the optical pickup 2, and the converted electric signal is sent to the RF amplifier circuit 3 as a reproduced signal Sd.
- This reproduced signal Sd is amplified in the RF amplifier circuit 3, subjected to equalizing processing in the equalizer circuit 7, and output as an RF signal Sf.
- the RF signal S f is binarized by the binarizing circuit 6 and taken into the CPU 9 as a binarized signal Se.
- the captured binary signal Se is subjected to demodulation and error detection and correction in the CPU 9, and is generated as data.
- the reproduction signal Sd sent to the RF amplification circuit 3 is sent to the LPP detection circuit 4 to detect the presence or absence of LPP.
- the gate circuit 5 When the LPP is detected, the gate circuit 5 generates a gate signal for measuring the reproduction signal Sd near the LPP.
- the RF signal S f is sent to the RF amplitude measurement circuit 8, and the RF amplitude measurement circuit 8 measures the amplitude of the RF signal S f while the gate signal S g generated in the gate circuit 5 is generated. , And sends the result to CPU 9.
- FIG. 2 is a schematic diagram of an RF signal waveform for which an amplitude measurement is performed in the RF amplitude measurement circuit 8.
- the RF signal waveform in Fig. 2 is 3T (T indicates the minimum unit time of the clock cycle, and 3T is the longest information pit formed on the groove track G1. 2003/016811
- FIG. 3 is a diagram showing a light beam irradiation area corresponding to each RF signal waveform in FIG. 2, a positional relationship between an LPP (LPP shown in Patent Document 1) and 3T information pits.
- LPP LPP shown in Patent Document 1
- the waveform having the amplitude indicated by the arrow is an information pit (3T length) recorded on the groove track G1 shown in FIG. 3 (a).
- the reproduced signal waveform when the light beam irradiation area S1 is reproduced from the point A to the point B while the light beam irradiation area S1 is moved from the point A to the point B is shown.
- the reproduced signal waveform in FIG. 2 (b) shows the reproduced signal waveform when the light beam irradiation area S 1 is moved from the point A to the point B to reproduce the LPP shown in FIG. 3 (b).
- the reproduced signal waveform in FIG. 2 (c) shows the reproduced signal waveform when the light beam irradiation area S1 moves from point A to point B and reproduces the LPP shown in FIG. 3 (c).
- the center line 3 0 of the 3T information pit formed in the group track G 1 is shifted from the center line 010 of the groove track 01 by a length R to the left in FIG. 3 (a). Indicates the status. That is, the 3T information pit row is recorded on the left side with a length R shifted.
- R 0.086 zm
- the center line 3 TO of the 3T information pit formed on the groove track G1 is in the direction opposite to the LPP formation direction indicated by the arrow from the center dotted line G 1 O of the group track G1. It is shown as 0.086 m.
- the information pit recorded at the position where the LPP is formed has an equivalently large protrusion of the land inside the LPP to the group, so that the amount of information pit to be recorded is greatly reduced. As a result, information pits smaller than other information pits are formed.
- the center point O of the light beam irradiation area S1 for reproducing the information of the 3T information pit coincides with the center line G1O of the group track G1 while moving from the A to the B direction on the group track G1. Move and play.
- the light beam irradiation area S 1 reaches the position where the LPP is formed, the change in the amount of reflected light from the light beam irradiation area S 1 decreases.
- the amplitude near T2 of the RF signal amplitude decreases.
- the amplitude of the RF signal shown in FIG. 2A decreases most.
- the RF signal from the light beam irradiation area S1 The amplitude gradually decreases as approaching the LPP, and gradually increases as the distance from the LPP increases.
- FIG. 3 (b) shows the center O of the 3T information pit light beam irradiation area S1 formed on the group track G1, the center line GIO of the group track G1 on which the 3T information pit is formed, and This shows the case where the 3T information pit center line 3TO matches.
- the effect of the presence of LPP does not appear on the amplitude of the corresponding RF signal in Fig. 2 (b). This is because when the 3T information pit T2 is formed in the LPP, the amount of the 3P information pit Tl, T3 spreads more in the LPP formation direction than the other 3T information pits T3, and the information pit is cut off due to the protrusion of the inner land This is because the amounts match.
- the area where the light beam irradiation area S1 and the 3T information pit T2 overlap each other is 3T. This is because the area where the information pits T1 and T3 overlap the light beam irradiation area S1 is almost the same.
- FIG. 3 (c) shows that the center line 3 ⁇ of the information pits 3 ⁇ ⁇ ⁇ ⁇ formed on the groove track G1 is shifted from the center line G 1 ⁇ of the group track G1 3 ⁇ on which the information pits are formed. ) Shows a state shifted to the right by 0.086 ⁇ . Since it is shifted in the same direction as the LPP formation direction shown in FIG. 3 (a), it is shown as +0.086 ⁇ . That is, the 3 ⁇ information pit row is recorded on the right side with a length of +0.086 // m shifted.
- the portion of the land inside the LPP that protrudes into the group becomes equivalently small, so that the amount of the information pit to be recorded is reduced.
- the information pits to be recorded expand in the LPP formation direction, so that information pits thicker than other information pits are formed.
- the center O of the light beam irradiation area S1 moves on the center line G10 of the groove track G1 in the direction from A to B for reproduction.
- the change in the amount of reflected light from the light beam irradiation area S 1 increases, and the RF in FIG.
- FIG. 3 (b) shows the optimum recording state, and the RF signal is not affected by the LPP.
- (a) and (c) show a state where the balance between the amount of information pits to be recorded spreading in the LPP formation direction and the amount of information pits cut off by the protrusion of the inner land is lost, and the RF signal amplitude is reduced in that part. Only different levels are played.
- FIG. 4 is a diagram showing experimental results on the relationship between the RF change amount and the number of P I (inner parity) errors shown in Patent Document 3. ? ? Is obtained by subtracting the amplitude value of the RF signal obtained by reproducing the information pits in the area irradiated by the light beam ⁇ 2 from the amplitude value of the RF signal obtained by reproducing the information pits not included in the area irradiated by the light beam 12. Is the RF variation. Further, the RF signal obtained by reproducing the information pit including the LPP in the area irradiated by the light beam 12 is binary-coded by the binary circuit 6, demodulated by the CPU 9, and subjected to error detection and correction (ECC). The number of errors that occurred in the PI (inner parity) among the number of errors found by performing the above is defined as the number of PI errors.
- ECC error detection and correction
- the RF change in Fig. 2 (a) is 0.8 division (ldivison is equivalent to one division in Fig. 2 (a); hereinafter abbreviated as "div.”). And 619.
- the RF change amount in Fig. 2 (b) is 0.0 (div), and the number of PI errors at that time is fifteen.
- the amount of RF change in Fig. 2 (c) is 0.4 (div), and the number of PI errors at that time is 928.
- Fig. 4 shows 18 PI errors when the RF change is 0.2 (div) and PI errors when the RF change is 0.3 (di V), which are not shown in Fig. 2. The points for the case of the number 181 are further displayed. From Fig. 4, it can be seen that the number of PI errors is smallest when the RF variation is near zero.
- the CPU 9 measures the RF change amount when reproducing the 3T information pit formed while changing the tracking offset value, and sets the tracking offset value at which the RF change amount becomes 0. It is possible to determine the tracking offset value to be recorded so as to minimize the occurrence of the number of data errors.
- FIG. 5 shows a flowchart for detecting the optimum tracking offset value.
- step S1 detection of an optimum tracking offset value is started.
- step S2 the optical pickup 2 of the information recording / reproducing apparatus is moved to a power calibration area on the optical disc 1.
- the power calibration area is an area for adjusting the intensity of the light beam 12 emitted from the optical pickup 2 located on the inner peripheral side of the optical disc 1.
- step S3 the information recording / reproducing apparatus forms information pits on the optical disc 1 while changing the intensity of the light beam 12 emitted from the optical pickup 2 in the power calibration area, and the information pits are formed. By reproducing the information, the intensity of the light beam 12 for forming the optimal information pit is searched for and determined.
- step S4 the optical pickup 2 is moved to a desired location, for example, an unrecorded area, and 3T information pits are formed and reproduced using the optimum power determined in S3.
- step S5 among the reproduction signals generated when the information pits formed in step S4 are generated, the LPP is the reproduction signal amplitude and LPP obtained by reproducing the 3T information pits not included in the region irradiated with the light beam 12.
- the RF amplitude measurement circuit 8 measures the 3T information pit reproduced in the area irradiated with the light beam 12 and the reproduced signal amplitude, and the LPP is not included in the area irradiated with the light beam 12
- the CPU 9 calculates the RF change amount, which is the difference between the amplitude of the reproduced signal obtained by reproducing the information pit and the amplitude of the reproduced signal obtained by reproducing the 3T information pit including the LPP in the region irradiated with the light beam 12. The calculation result is stored in the memory in CPU9.
- step S6 when the measured RF change is larger than the previously measured RF change, the time is determined to be positive, and the process proceeds to step S7, where the measured RF change is smaller than the previously measured RF change. Is negative, and the process proceeds to step S8.
- step S7 a predetermined value is subtracted from the current tracking offset value (when subtracted, the center point O of the light beam irradiation area S1 is located on the left side of the center point GO of the group track G1 in FIG. 3 (a)). Go to.).
- the value to subtract is dal Although any value smaller than the distance between the track tracks can be used, in this embodiment, for example, 0.1 Olzm is used.
- Information is recorded using the optimum power determined in step S3. Then, proceed to Step S5.
- step S8 when the RF change amount described in step S6 is negative, the process proceeds to step S9, and when the RF change amount is positive, the process proceeds to step S10.
- step S9 a predetermined value is added to the current tracking offset value.
- the value to be added is an arbitrary value smaller than the distance between the groove tracks. The value can be set, for example, in this embodiment, 0.01 ⁇ is used. Add 0.1 / m to the current tracking offset value and record the information signal using the optimum power value determined in step S3. Then, proceed to Step S5.
- step S10 the tracking offset value when the RF change amount becomes 0 is determined as the optimum tracking offset value.
- step S11 recording of information to be recorded on the optical disc 1 is started using the optimum tracking offset value determined in step S10.
- step S12 when there is no more data to be recorded on the optical disc 1, the optimal recording is terminated.
- FIG. 6 shows that information pits are continuously formed using tracking offset values in a predetermined range, and the continuously formed information pits are continuously reproduced to determine an optimum tracking offset value.
- FIG. 6 shows a flowchart for detecting the optimum tracking offset value.
- step S14 the optical pickup 2 of the information recording / reproducing apparatus is moved to a power calibration area on the optical disc 1.
- the power calibration area is the light emitted from the optical pickup 2 located on the inner peripheral side of the optical disc. This is an area for adjusting the intensity of the beam 12.
- step S15 the information recording / reproducing apparatus forms information pits on the optical disc 1 while changing the intensity of the light beam 12 emitted from the optical pickup 2 in the power calibration area. By performing reproduction, the intensity of the light beam 12 for forming an optimum information pit is searched for and determined.
- step S16 the optical pickup 2 is moved to a desired location (for example, an unrecorded area on the optical disc 1), and the tracking offset value is continuously changed while changing the tracking offset value using the optimum power determined in step S15.
- An information pit is formed over a plurality of sectors. The range in which the tracking offset value is changed can be changed at predetermined intervals within the range between the groove tracks.
- the information pit is formed by changing the tracking offset value in 17 steps of 0.01 ni. . Then, the formed information pit is reproduced.
- step S17 of the reproduction signal when the information pit is reproduced in step S16, for each tracking offset value, reproduction of the 3T signal in which the LPP is not included in the irradiation area of the light beam 12
- the signal amplitude and LPP are included in the irradiation area of the light beam 1 and 2.
- the amplitude of the reproduced signal of the 3T signal is measured by the RF amplitude measurement circuit 8, and the LPP is not included in the irradiation area of the light beam 12.
- the CPU 9 calculates the RF change amount, which is the amplitude difference between the reproduced signal of the 3T signal and the amplitude of the reproduced signal of the signal and the LPP within the irradiation area of the light beam 12. Then, the amount of RF change for each tracking offset value is recorded in a memory in the CPU 9.
- step S18 the smallest value among the RF change amounts obtained in step S17 recorded in the memory of CPU 9 is calculated and compared. As a result, the tracking offset value with the smallest RF change amount is determined as the optimum tracking offset value.
- step S19 the data to be recorded is recorded using the optimum power value and the optimum tracking offset value.
- step S20 If there is no more data to be recorded in step S20, the recording ends.
- the recording disk where the address signal is pre-engraved in the land as LPP,? ? Within the irradiation area of the light beam 12
- the LPP is changed to the light beam 12. This has made it possible to reduce the occurrence of errors in the reproduction signal included in the irradiation area.
- Information pits are formed by changing the tracking offset value for each of the consecutive sectors, and the offset value of the sector with the least RF change of the reproduced signal obtained by reproducing the formed information pit is determined as the optimum tracking offset.
- the optimum tracking offset value can be searched at high speed.
- the configuration of the information recording / reproducing apparatus of the present embodiment is the same as that shown in FIG.
- FIG. 7 shows a positional relationship between the LPP shown in Patent Document 2 different from the LPP described in FIG. 3 and the light beam irradiation region.
- the light beam 12 emitted from the optical pickup 2 is converged, and is emitted to the information pit formed on the group track G2.
- the reflected light of the irradiated light is measured as an RF signal waveform which is a reproduction signal.
- LPP is on the left side of the groove track G2 in FIG. (Hereinafter, this LPP will be referred to as the inner LPP.)
- the tracking offset value is changed so that the light beam 12 moves from the left side to the right side of the group track G2 to form information pits.
- Figure 8 shows the RF signal waveform during playback.
- FIG. 8 shows the relationship between the tracking offset value and the RF signal waveform.
- FIG. 8 (a) shows that the center point O of the light beam irradiation area S1 in FIG. 7 is shifted by a length R to the left from the center GO of the group track G1 where the 3T information pit is formed.
- R is a predetermined amount, for example, the case of 0.086 / zm will be described.
- the value of R can be selected arbitrarily within the range of the distance between the glue and the ⁇ ⁇ ⁇ ⁇ track.
- Figure 8 (a) shows a tracking offset value of 0.086 ⁇ (in Fig. 3, the outer LPP formation direction is positive, The opposite direction is assumed to be negative.)
- Fig. 3 the outer LPP formation direction is positive, The opposite direction is assumed to be negative.
- FIG. 8 (b) shows the RF signal waveform near the inner LPP when 0 ⁇ is added as the tracking offset value, that is, when no tracking offset is added.
- Fig. 8 (c) shows the 3TRF signal waveform when the 3T information pit is reproduced with and without the inner LPP in the light beam irradiation area when +0.086 jum is added as the tracking offset value. Is shown.
- the light beam 12 moves to the right with respect to the group track G2 to perform recording and reproduction.
- FIG. 9 shows a state in which the irradiation range S 1 of the light beam 12 is located on the left side of the LPPT 5.
- the RF signal waveform when the information pit is formed and reproduced by changing the tracking offset value so that the light beam 12 moves from the left side to the right side of the group track G2 is shown in FIG. ) To (c).
- FIGS. 10A to 10C are diagrams showing the relationship between the tracking offset value and the RF signal waveform.
- FIG. 10 (a) shows a state in which the center point O of the light beam irradiation area S1 in FIG. 9 is shifted to the left side R from the center G02 of the group track G2 where the 3T information pit is formed.
- R is a predetermined amount, for example, the case of 0.086 will be described. The value of R can be selected arbitrarily within the range of the distance between group tracks.
- FIG. 10 (a) shows that the inner LPP is shifted to the light beam irradiation area S by adding a tracking offset value of 0.086 ⁇ (the outer LPP forming direction is positive in FIG. 9 and the opposite direction is negative in FIG. 9).
- the RF signal waveform of the reproduced 3T information pit T5 when included in 1 is shown.
- FIG. 10 (b) shows the RF signal waveform near the outer LPP when 0 ⁇ is added as the tracking offset value, that is, when no tracking offset is added.
- the number of PI errors has been reduced to 122 and the number of errors is small.
- FIG. 10 (c) shows the RF signal waveform near the outer LPP when +0.086111 is added as the tracking offset value.
- FIG. 11 is a diagram showing the relationship between the RF change amount and the number of PI errors.
- the RF variation shown is the 3 TRF amplitude that includes the inner LPP shown in Fig. 8 within the light beam irradiation area at the same tracking offset value of the RF signal waveforms shown in Figs. This value is obtained by subtracting the value of 3 TRF amplitude that includes LPP in the light beam irradiation area.
- the 3TRF amplitude including the inner LPP in the light beam irradiation area in FIG. 8A is 3 div.
- Point c is the 3 TRF amplitude that includes the inner LPP in Fig. 8 (c) within the light beam irradiation area.2
- the 3 TRF amplitude that includes the outer LPP in Fig. 10 (c) within the light beam irradiation area. Indicates that the sum of the number of PI errors is 639 when the RF change amount minus 0 diV minus 0.8 div.
- the total number of PI errors becomes the smallest near the RF change amount 0. Therefore, by setting the tracking offset value to 0, the number of errors when reading information pits is minimized.
- the LPP is on both sides of the group track
- the LPP is on the left side of the groove track in the light beam irradiation area
- the LPP is on the right side of the group track in the light beam irradiation area
- FIG. 12 shows a flowchart of tracking offset value detection.
- step S80 the optical pickup 2 of the information recording / reproducing apparatus is moved to a power calibration area on the optical disc 1.
- the power calibration area is an area for adjusting the intensity of the light beam 12 emitted from the optical pickup 2 located on the inner peripheral side of the optical disk.
- step S81 the information recording / reproducing apparatus forms information pits on the optical disc 1 while changing the intensity of the light beam 12 emitted from the optical pickup 2 in the power calibration area, and the information pits are formed.
- the intensity of the light beam 12 for forming an optimum information pit is searched for and determined by reproducing the information.
- step S82 the optical pickup 2 is moved to a desired location (for example, an unrecorded area on the optical disc 1), and is continuously changed while changing the tracking offset value using the optimum power determined in step S15.
- An information pit is formed over a plurality of sectors.
- the range in which the tracking offset value is changed can be changed at predetermined intervals within the range between the group tracks.
- the information pit is formed by changing the tracking offset value in seventeen steps of 0.1 ⁇ m. You. Then, the formed information pit is reproduced.
- step S83 of the reproduction signal obtained when the information pit is reproduced in step S82, for each tracking offset value, reproduction of the 3T signal in which LPP is not included in the light beam 12 irradiation area
- the amplitude of the signal and the inner LPP are included in the irradiation area of the light beam 1 2 3
- the amplitude of the reproduced signal of the T signal is measured by the RF amplitude measurement circuit 8, and the LPP is not included in the irradiation area of the light beam 1 2 3 T
- the CPU 9 calculates the RF change amount RFI, which is the amplitude difference between the 3T signal reproduction signal and the amplitude of the signal reproduction signal and the inner LPP within the irradiation area of the light beam 12.
- step S84 the amplitude of the reproduced signal of the 3T signal that does not include LPP in the irradiation area of the light beam 12 for each tracking offset value of the reproduced signal when the information pit is reproduced in step S82.
- the RF amplitude measurement circuit 8 measures the amplitude of the reproduced signal of the 3T signal that includes the LPP and the outer LPP within the irradiation area of the light beam 12, and measures the reproduction signal of the 3T signal that does not include the LPP within the irradiation area of the light beam 12.
- the CPU 9 calculates the RF change amount RFO, which is the amplitude difference of the reproduced signal of the 3T signal, including the amplitude and the outer LPP within the irradiation area of the light beam 12. Then, the RF change amount RFO with respect to the 4 tracking offset value is recorded as a parameter RFO in a memory in the CPU 9.
- step S85 the parameter RFI is subtracted from the parameter RFO for each tracking offset value, and the RF change amount RF, which is the absolute value of the subtraction result, is recorded in the memory in the CPU 9 as the parameter RF.
- step S86 the smallest value among the parameters RF obtained in step S85 recorded in the memory of the CPU 9 is calculated and compared. As a result, the tracking offset value corresponding to the parameter RF having the smallest RF change amount is determined as the optimum tracking offset value.
- step S87 data to be recorded is recorded using the optimum power value and the optimum tracking offset value.
- step S88 when there is no more data to be recorded, the recording is terminated.
- the recording disk in which the address signal is engraved on the land in advance as the LPP even when the irradiation area of the light beam 12 includes the LPP from a different direction, the RF change amount is not changed. By changing the tracking offset so as to minimize the error, it is possible to further reduce the number of errors in the reproduced signal including the LPP in the irradiation area of the light beam 12.
- FIG. 13 shows the configuration of the information recording / reproducing apparatus of the third embodiment. Common parts to Fig. 1 The detailed description of is omitted.
- the LPP detection circuit 4 includes an outer LPP detection circuit 41 and an inner LPP detection circuit 42.
- the outer LPP detection circuit 41 is a circuit for detecting the LPP existing on the outer periphery 5 side of the disc with respect to the information pits formed on the groove from the push signal Sh which is a tracking error signal.
- 2 is a circuit for detecting the LPP existing on the inner circumference side of the disc with respect to the information pits formed on the groove.
- the RF amplitude measurement circuit 8 includes a peak hold circuit 81, a bottom hold circuit 82, and A / D conversion circuits 82 and 84.
- Peak hold circuit 81 is a circuit for holding the peak portion of the signal waveform of the RF signal Sf read from the optical disk 1. The held value is converted to a digital signal by the AZD conversion circuit 82, and then input to the CPU 9.
- the bottom hold circuit 83 is a circuit that holds a potion portion of the signal waveform of the RF signal Sf read from the optical disc 1. The held value is decoded by the AZD conversion circuit 84.
- the LPP detection circuit 4 detects the LPP in the light beam irradiation area on the optical disk 1, and the CPU 9 converts the peak value and the bottom value of the reproduced signal waveform before and after the LPP detection timing into digital signals of the AZD conversion circuits 82 and 84. Calculate from signal output.
- FIG. 14 shows the optimal tracking offset value detection flow according to the third embodiment.
- step S64 detection of the optimum tracking offset value is started.
- step S65 the optical pickup 2 is moved to the power calibration area.
- step S66 the optical pickup 2 is moved to the power calibration area 25, and the optimum value of the intensity of the light beam 12 irradiated from the optical pickup 2 is determined. Set 1 to sector number S.
- step S67 the optical pickup 2 is moved to a desired location (for example, an unrecorded area on the optical disc 1), and the optical pickup 2 is continuously changed while changing the tracking offset value using the optimum power determined in step S65.
- Information on multiple sectors can be changed at predetermined intervals within the range between the group tracks, but here, for example, the tracking offset is set in 16 steps from 0.011 111 to 0.008 111 to +0.07 ⁇ .
- the information pit is formed by changing the bit value. Then, the formed information pit is reproduced. At this time, how long the information pits are formed per tracking offset value is arbitrary. Here, for example, the information pits are formed over one sector.
- the information pit pattern to be formed can be an arbitrary pit pattern.
- an information pit is formed using a 3 ⁇ continuous pattern having the smallest distance between the information pit patterns.
- step S68 a continuous pattern of 3 ⁇ information pits in one sector recorded with the same tracking offset value in step S67 is reproduced.
- step S69 from among the signals reproduced in step S68, the RF signal S f not including the LPP in the irradiation area of the light beam 12 during the period corresponding to the gate signal S g 1 from the gate circuit 5.
- the peak value P 1 is detected by the peak hold circuit 81.
- the detected value is converted into a digital signal by the AZD conversion circuit 82, and then stored in a memory in the CPU 9 as a parameter P1.
- the bottom hold circuit 83 detects the bottom value B 1 of the RF signal S f that does not include LPP in the irradiation area of the light beam 12 during the period corresponding to the gut signal S g 2 from the gate circuit 5.
- the detected value is converted into a digital signal by the AZD conversion circuit 84, and then stored as a parameter B1 in a memory in the CPU 9.
- step S70 from the signals reproduced in step S68, the peak value and the bottom value of the RF signal Sf including the inner LPP in the irradiation area of the light beam 12 are determined in the same manner as in the operation in step S69. Detect and store the peak value in the memory in the CPU 9 as the parameter P 2 I and the bottom value as the parameter B 2 I.
- FIG. 16 shows the relationship between the inner LPP, the push-pull signal Sh, the RF signal Sf, the gate signal Sg2, the peak value P2I, and the bottom value B2I.
- the upper envelope signal P 1 in FIG. 16 refers to the upper envelope of the RF signal S f and the lower envelope signal P 1.
- the loop signal B1 means the lower envelope of the RF signal Sf. Note that the envelope signal can be generated by a circuit combining a transistor and a capacitor.
- the push-pull signal Sh has an upward convex shape, and the inner LPP is binarized to generate the gate signal SG2.
- Upper peak value of the upper envelope signal p 1 and lower envelope signal B 1 of the RF signal S f during the period from S g 2 s to S g 2 e of the gate signal S g 2 generated by the inner LPP are held by a peak hold circuit 81 and a bottom hold circuit 83 which are configured by a diode capacitor and the like.
- the peak hold circuit 81 holds the peak value P 2 I of the upper envelope signal of the RF signal S f. Then, the peak value P 2 I is stored as the parameter P 2 I.
- the bottom hold circuit 83 the bottom value B2I of the lower envelope signal of the RF signal Sf is held. Then, the bottom value B 2 I is stored as the parameter B 2 I.
- step S71 from the signals reproduced in step S68, the peak value and the bottom value of the RF signal S ⁇ ⁇ including the outer LPP in the irradiation area of the light beam 12 as in the operation in step S69. Is detected, and the peak value is stored in the memory in the CPU 9 as the parameter ⁇ 2 ⁇ , and the bottom value is stored as the parameter B 2 O.
- FIG. 15 shows the relationship between the outer LPP, the push-pull signal Sh, the RF signal S ⁇ , the gate signal Sg1, the peak value p2O, and the bottom value B2O.
- the upper envelope signal p1 in FIG. 15 means the upper envelope of the RF signal Sf
- the lower envelope signal B1 means the lower envelope of the RF signal Sf.
- the lower peak value of each of the upper envelope signal P 1 and the lower envelope signal B 1 of the RF signal S f during the period from S gls to S gle of the gate signal S gl generated by the outer LPP is It is held by a peak hold circuit 81 and a bottom hold circuit 83 composed of diodes and capacitors.
- the peak hold circuit 81 holds the peak value P 2 O of the upper envelope signal of the RF signal S f.
- the peak value P 2 O is stored as the parameter P20.
- the bottom hold circuit 83 holds the bottom value B 2 O of the lower envelope signal of the RF signal S f.
- the bottom value B20 is stored as parameter B2O.
- IP1-P2II + IP1-P20I) is calculated in the CPU 9 as the peak value change amount ⁇ , and is stored in the memory in the CPU 9 as the parameter ⁇ P.
- step S73 IB1 ⁇ B2I
- step S74 ⁇ + ⁇ is calculated in the CPU 9 as the envelope change amount ⁇ , and stored as a parameter ⁇ in a memory in the CPU 9.
- step S75 the sector number S is incremented by one, and when the reproduction position is the 18th sector (when the sector number S is 17), the process proceeds to step S76, where the reproduction position is 2 to 16 sectors. If so, go to step 68.
- step S76 the CPU 9 compares and calculates the smallest parameter ⁇ from the 16 sectors ⁇ calculated in step S74, and determines the tracking offset value corresponding to the parameter ⁇ as the optimal tracking offset value. I do.
- step S77 data to be recorded is recorded on the optical disc 1 with the optimal tracking offset value determined in step S76.
- step S78 If there is no more data to be recorded in step S78, the process ends.
- the LPP is irradiated with the light beam.
- the tracking offset so that the fluctuation of the amplitude of the reproduction signal included in one direction in the region and the amplitude of the reproduction signal including LPP in the other direction within the light beam irradiation region is minimized, the LPP is changed. It is possible to further reduce the number of error occurrences of the reproduced signal that includes in the irradiation area of the light beam 12.
- the embodiment for the LPP shown in FIG. 7 and FIG. is described using the block configuration shown in FIG. 13 as the configuration, the implementation of FIG. 14 is also performed for the LPP shown in FIG. 3 using the block configuration shown in FIG. A form can be implemented.
- FIG. 17 shows a block diagram of the information recording / reproducing apparatus of the fourth embodiment.
- the same parts as those in FIG. 1 are denoted by the same reference numerals and description thereof is omitted.
- the reproduced signal Sd reproduced from the optical pickup 2 through the information pit is converted into a binary signal by the binary circuit 6 through the equalizer circuit 7, and is converted by the 816 demodulator 91 in the CPU 9 into the binary signal. Demodulated. An error occurrence portion of the demodulated data is detected by an error detection and correction unit 92. Further, the CPU 9 calculates from the ECC code which part of the optical disc 1 is where the error occurs.
- the LPP detection circuit 4 includes an outer LPP detection circuit 41 and an inner LPP detection circuit.
- the outer LPP detection circuit 41 is a circuit that detects the LPP existing on the outer peripheral side of the disc with respect to the information pits formed on the group from the tracking error signal
- the inner LPP detection circuit 42 is This circuit detects the LPP existing on the inner peripheral side of the disc with respect to the formed information pits.
- the CPU 9 determines whether an error has occurred in the reflected light of the light beam 12. In this way, by reproducing the information pits encoded by the ECC recorded on the optical disc 1 and detecting the outer and inner LPPs, the CPU 9 can detect the LPP within the irradiation area of the light beam 12. It is possible to determine whether or not an error has occurred in the signal that reproduced the information pit.
- Figure 18 shows the relationship between the tracking offset value and the number of data errors in the tracking offset value.
- the number of data errors displayed in the inner LPP column is the number of errors that occurred in the positional relationship between the information pit T4 and the inner LPP (I L 1) in FIG.
- Each column in FIG. 18 shows the number of data errors generated by forming and reproducing information pits by shifting the tracking offset value m) from the left side to the right side in FIG. 7 by 0.01 ⁇ .
- the tracking offset value is a force capable of defining an arbitrary value within the distance between group tracks. In the present embodiment, a case where the tracking offset value is changed by, for example, 0.01 ⁇ will be described.
- the tracking offset value is negative, a part of the information pit is formed on the inner LPP (I L1), so that a level change occurs in the information pit where no LPP exists, and the data error increases.
- the tracking offset value is positive, the formation position of the information pit gradually moves from the group track G2 to the land track L3. Since a part of the information pit is not formed on the inner LPP, a data error hardly occurs.
- the number of data errors displayed in the outer LPP column is the number of errors that occurred in the positional relationship between the information pit T5 and the outer LPP (OL 1) in FIG.
- the tracking offset value (m) When the tracking offset value (m) is moved from the left side to the right side in Fig. 9 by 0.01 xm, information pits are formed and represent the number of data errors generated by reproduction. If the tracking offset value is negative, the formation of the information pit moves from the group track G2 to the land track L4, contrary to the inner LPP. Since data pits are not partially formed on the outer LPP, data errors hardly occur.
- the tracking offset value is positive, since a part of the information pit is formed on the outer LPP, a level fluctuation occurs in the information pit where no LPP is present, and the data error increases.
- FIG. 19 is a graph showing the relationship between the tracking offset value and the number of data errors at the tracking offset value in FIG.
- Figure 19 (a) shows the tracking offset value and its tracking offset value.
- Fig. 19 (b) shows the tracking offset value and the inner LPP when the outer LPP is included in the irradiation area of the light beam 12.
- Fig. 19 (c) shows the number of data errors that occur in the reproduced signal when the light beam 12 is included in the irradiation area of the light beam 12. Shows the sum of the number of data errors that occur.
- Fig. 19 (a) it can be seen that for the outer LPP, the number of data errors that occur increases as the tracking offset value increases. From Fig. 1 9 .. (b), it can be seen that the number of data errors for the inner LPP increases as the tracking offset value decreases. From Fig. 19 (c), when the tracking offset value is 0.02 ⁇ , the sum of the number of data errors becomes two (point D). The sum of the number of data errors is also two when the tracking offset value is 0.03 ⁇ ⁇ and 0.03 / zm. The intermediate value between them, 0.02 ⁇ , is set as the optimum tracking offset value.
- FIG. 20 shows a flowchart for obtaining the optimum tracking offset value in the fourth embodiment.
- step S21 detection of the optimum tracking offset value is started.
- step S22 the relationship between the tracking offset value shown in FIG. 18 and the number of data errors that occur when the inner LPP or the outer LPP is included in the light beam irradiation area S1 when the tracking offset value is used ( Hereafter, it is referred to as a tracking offset reference table.) If the tracking offset reference table has not been created, the process proceeds to S23, and if it has been created, the process proceeds to S39.
- step S39 the current tracking offset value is read from the value stored as the parameter To in the CPU 9.
- the tracking offset value To is stored as a parameter To in the CPU 9 when the information reproducing / recording apparatus reads data from the optical disc 1 or records data.
- FIG. 21 shows a processing flow when the process proceeds to step S23.
- FIG. 21 is an internal flow of step S23 for creating a tracking offset reference table.
- step S24 creation of a tracking offset reference table is started.
- step S25 the optical pickup 2 moves to the power calibration area of the optical disc 1.
- step S26 the sector number S of the sector for recording and reproduction is set to 0 with the first dragging offset value.
- the tracking offset value can be set to any value within the distance between group tracks.
- the tracking offset value is changed from -0.0111 to + 0.07 ⁇ by 0.01 ⁇ .
- the area on the optical disc 1 where information pits are formed can be set arbitrarily.
- 16 sectors constituting one ECC block are used. Number of ECC blocks 1
- the number of sectors that make up an ECC block is not limited to this embodiment.
- Recording and reproduction are performed by changing the tracking offset value for each sector.
- Set the first tracking offset value To to 1.08 zm.
- step S27 0.08 ⁇ of the To value set in step S26 is added to the tracking error signal.
- the optical pickup 2 moves from the light beam irradiation position where the tracking error signal is equal to 0 by 0.08 ⁇ in the direction opposite to the direction in which the outer L ⁇ is formed as shown in FIG.
- step S28 the signal after the 8-16 modulation with the ECC code is recorded over one sector.
- step S29 the sector number S is incremented by 1 and the tracking offset value To is increased by 0.1.
- step S30 it is determined whether or not the force whose sector number S is 16 is applied. If the sector number S is 16, proceed to step S31. If the sector number S is not 16, return to step S27. After the 8-16 modulation with the ECC code in the next sector with a different tracking offset value And record the signal. In step S31, the recorded signal is reproduced, and after performing 8-16 demodulation, error detection and correction are performed.
- step S32 the sector number S to be reproduced is set to 0.
- the tracking offset value To is set to the same value as that set in step 26, i.e., 0.08 ⁇ , and the information pit formed in step S28 is reproduced.
- step S33 the information pits formed in one sector are reproduced, and the number of errors N (out) occurring in the reproduction signal including the outside L in the light beam irradiation area at the set tracking offset value ⁇ Then, the number of errors N (in) occurring in the reproduced signal including the inner LPP in the light beam irradiation area is calculated.
- step S34 the To value, N (out) and N (in) are stored in the memory in the CPU 9, respectively.
- step S35 the sector number S is increased by 1, and the tracking offset value To is increased by 0.01 ⁇ .
- step S36 it is determined whether or not the sector number S is 16. If the sector number S is 16, the process proceeds to step S37, and if the sector number S is not 16, the process returns to step S33, where the information pit formed in the next sector with a different tracking offset value is read. Reproduce.
- step S37 the sum of N (out) and N (in) for each tracking offset value T-o stored in the memory is compared, and the tracking that minimizes the sum of N (out) and N (in) is performed. Find the offset value To, and set that To value as the optimal tracking offset value.
- step S38 the tracking offset reference table creation processing ends.
- step S39 the currently set tracking offset value To is read.
- step S40 signal reproduction is performed.
- the reproduced signal is demodulated by 8- 16 to perform error detection and correction.
- step S41 N (out) and N (in) are calculated from the data on which the error detection and correction have been performed in step S40.
- step S42 using the sum of N (out) and N (in) per sector calculated in step S41, the tracking offset reference tape created or previously created in S23. , Calculate the offset To value that minimizes the sum of N (out) and N (in). That is, when N (out) is 0 and N (in) is 5, and N (out) and N (in) are 5, the tracking offset reference table in Fig. 18 is graphed. From points (a) to (c) in FIG. 19, when a corresponding point is searched, point E corresponds.
- the tracking offset value at that time is 0.01 im, and the interval up to the point D where the optimum tracking offset value is shown is +0.03 ⁇ . Therefore, by adding +0.03 ⁇ to the current tracking offset, the sum of N (out) and N (in) becomes the optimum tracking offset.
- FIG. 22 illustrates the relationship between the tracking offset value and the number of data errors.
- the LPP described with reference to FIG. 22 is an LPP of the type shown in Patent Document 1.
- the number of data errors displayed in the inner LPP column indicates the tracking offset value (m) from left to right in FIG. 3 in the positional relationship between the information pit and the outer LPP in FIG. It is the number of data errors that occurred at each tracking offset value when moved by 01 / im.
- the tracking offset value When the tracking offset value is positive, the area irradiated with the light beam 12 moves to the left in FIG. Increasing the tracking offset value to the negative side is equivalent to increasing the protrusion of the land inside the LPP to the group, and the information pit formed at the LPP position is partially cut off. For this reason, a level fluctuation occurs from an information pit formed at a position where no LPP exists, and as a result, the number of data errors increases. Conversely, when the tracking offset value is negative, the area irradiated by the light beam 12 moves to the right in FIG. When the tracking offset value increases to the plus side, a part of the information pit is formed on the LPP, so that a level variation occurs in the information pit in a portion where the LPP does not exist, and the data error increases.
- FIG. 23 (a) shows the number of data errors that occurred when the area irradiated with the light beam 12 included the outer LPP for the set tracking offset value
- Fig. 23 (b) shows the number of data errors that occurred when the inner LPP was included in the area irradiated with the light beam 12 with respect to the tracking offset value. Shows the sum of the number of data errors in b). From Fig. 23 (a), when the outer LPP is included in the irradiation area of the light beam 12, the tracking offset value increases in the plus or minus direction.
- the number of data errors increases. From Fig. 19 (b), it can be seen that for the inner LPP, the number of data errors increases when the tracking offset value increases to the negative side. This type of LPP is formed at a position close to the group, so the inner LPP is away from the group. From Fig. 19 (c), the sum of the number of data errors is 0 when the tracking offset value is 0.02 ⁇ . When the tracking offset value is 0.01 ⁇ m and 0.03 ⁇ , the sum of the number of data errors is 0. The intermediate value, 0.02 ⁇ , is set as the optimal tracking offset value.
- the number of errors in the reproduced signal when the irradiation area of the light beam 12 includes LP and ⁇ using the ECC is calculated for each tracking offset value while changing the tracking offset value. By doing so, it becomes possible to search for the tiger or king offset value with the least number of errors in the reproduced signal including the LPP within the irradiation area of the optical beam 12.
- FIG. 24 is a flowchart showing that data to be recorded by detecting an optimum tracking offset value using ECC in the linking area is recorded. In step S44, detection of an optimum tracking offset value and recording of data are started.
- step S45 the optical pickup 2 is moved to the power calibration area.
- step S46 the optimum value of the intensity of the light beam 12 irradiated from the light pickup 2 is determined in the power calibration area. If the power calibration has been completed, for example, when a disc is mounted, steps S45 and S46 are unnecessary.
- step S47 the optimum power obtained in step S46 is set as the power at which the information pit is to be recorded.
- step S48 in any of the 16 tracking offset steps recorded in the linking area, the number of errors generated when the inner LPP is included in the irradiation area of the light beam 12 and the outer LPP is Calculates whether the sum of the number of errors that occur when the target is included in the irradiation area is minimized.
- step S49 the tracking offset value at which the number of errors has been minimized in step S48 is determined and set as the optimum tracking offset value.
- step S50 the denita to be recorded is recorded in the unrecorded area following the linking area on the optical disk by using the tracking offset value determined in step S49.
- step S51 it is determined whether or not recording for searching for an optimum tracking offset value in another linking area is performed again.
- the process proceeds to step S53.
- the recording for searching for the optimum tracking offset value is performed, the process proceeds to step S52.
- step S52 the optical pickup 2 is moved to an unrecorded area next to the last recorded area executed in step S50, and using the optimal pattern obtained in step S46, Information pits are formed over a plurality of continuous sectors while changing the tracking offset value.
- the range in which the tracking offset value is changed can be changed at predetermined intervals within the range between the group tracks.
- the information pits are formed by changing the tracking offset value in 16 steps from 0.011 all the way to 0.108 111 to + 0.07 ⁇ . At this time, it is arbitrary how long the information pits are formed based on one tracking offset value, but here, for example, the information pits are formed over one sector.
- the tracking offset value is changed in steps of 0.01 ⁇ from 0.08 // 01 to +0.07 ⁇ , and the information subjected to the ECC encoding based on an arbitrary signal pattern is converted to the 1 ECC of the optical disc 1.
- the recording using the optimum tracking offset value is terminated assuming that there is no data to be recorded.
- FIG. 25 is a flowchart showing that the data to be recorded is detected by detecting the optimum tracking offset value in the linking area using the change in the amplitude value of the RF signal.
- step S54 detection of an optimum tracking offset value and recording of data are started.
- step S55 the optical pickup 2 is moved to the power calibration area.
- step S56 the optimum value of the power of the light emitted from the optical pickup 2 is determined in the power calibration area. If power calibration has been completed, for example, when a disc is mounted, steps S55 and S56 are not required.
- step S57 the optimum power obtained in step S56 is set as the power at which the information pit is to be recorded.
- step S58 in any of the 16 tracking offset steps recorded in the linking area, the bottom value of the reproduced signal amplitude due to the influence of the inner and outer LPPs is determined by irradiating the LPP with the light beam 12. Included in area Calculates whether the amount of change has been minimized by comparing with the bottom value of the reproduced signal amplitude.
- step S59 the tracking offset value at which the bottom value of the reproduction signal amplitude becomes minimum in step S58 is determined and set as the optimum tracking offset value.
- step S60 data to be recorded is recorded in an unrecorded area following the linking area on the optical disc 1 using the tracking offset value determined in step S59.
- step S61 it is determined whether or not the recording power for searching for the optimum tracking offset value again in another linking area.
- the process proceeds to step S63, and when the recording for searching for the optimum tracking offset value is performed, the process proceeds to step S62.
- step S62 the optical pickup 2 is moved to the unrecorded area next to the recorded area executed in step S60, and using the optimum power obtained in step S56, continuously changing the tracking offset value while changing the tracking offset value.
- Information pits are formed over multiple sectors.
- the range in which the tracking offset value is changed can be changed at predetermined intervals within the range between group tracks, but here, for example, from 0.011 111 all 0.08 ⁇ to +0.07 ⁇ m 16
- the information pit is formed by changing the tracking offset value in stages. At this time, depending on the 1-tracking offset value, how long the information pits are formed is arbitrary, but here, for example, the information pits are formed over one sector.
- the tracking offset value is changed from 0.08 ⁇ to +0.07 ⁇ in 0.01 / im steps, and EC is performed based on an arbitrary signal pattern.
- the encoded information is recorded in one ECC block of the optical disc 1. At this time, one sector is recorded for one tracking offset value.
- 16 tracking offset steps from 0.08 m to +0.07 ⁇ , 16 sectors are used. Since one E.CC block is composed of 16 sectors, errors can be detected after reproducing a reproduced signal in which the formed information pits are reproduced.
- step S63 the recording using the optimum tracking offset value is terminated assuming that there is no more data to be recorded.
- the optimum tracking offset value is detected without the user being aware of the waiting time for detecting the optimum tracking offset value. It is possible to do.
- the tracking servo control device having this configuration, when at least a part of the LPP is formed within the irradiation range of the light beam, the reproduction signal based on the reflected light of the light beam from the optical disk, and the LPP exists outside the irradiation range.
- the tracking offset value By changing the tracking offset value using the reproduction signal based on the reflected light in the case where the tracking signal is formed, it is possible to configure a tracking servo control device that minimizes the number of errors in the reproduction signal. Become.
- the tracking offset value is changed so as to minimize the change in the amplitude of the reproduction signal and the reproduction signal based on the reflected light when the LPP is formed outside the irradiation range, and the tracking offset value is used. Accordingly, it is possible to configure a tracking servo control device that minimizes the number of errors in the reproduced signal.
- the tracking offset value so as to minimize the change between the bottom value of the reproduction signal and the bottom value of the reproduction signal based on the reflected light when the LPP is formed outside the irradiation range. It is possible to configure a tracking servo control device that minimizes the number of errors in the reproduced signal. Further, the tracking offset is set so as to minimize the change between the bottom value and the peak value of the reproduction signal and the bottom value and the peak value of the reproduction signal based on the reflected light when the LPP is formed outside the irradiation range. By changing the value, it is possible to configure a tracking servo control device capable of minimizing the number of errors that occur when the amplitude of the reproduction signal does not change.
- the tracking offset is set so that the sum of the number of errors generated in the reproduction signal and the number of errors generated in the reproduction signal based on the reflected light when the LPP is formed outside the irradiation range is minimized.
- a tracking offset value is set so that a change in amplitude between the reproduction signal and the reproduction signal based on the reflected light from the optical disk when at least a part of the LPP adjacent in the other direction is formed is minimized. Change and use the tracking offset value. This makes it possible to configure a tracking servo control device that minimizes the number of errors in the reproduced signal.
- the average of the variation between the peak value of the reproduction signal and the peak value of the reproduction signal based on the reflected light from the optical disk when at least a part of the LPP adjacent in the other direction is formed, Set the tracking offset value so that it becomes the smallest with respect to the peak value of the reproduction signal when the LPP is not included in the beam irradiation range. This makes it possible to configure a tracking servo control device that minimizes the number of errors in the reproduced signal.
- the peak value and the bottom value of the reproduction signal and the peak value and the bottom value of the reproduction signal based on the reflected light from the optical disk when at least a part of the LPP adjacent in the other direction is formed.
- the error of the sum of the number of errors generated in the reproduction signal and the number of errors generated in the reproduction signal based on the reflected light from the optical disk when at least a part of the LPP adjacent in the other direction is formed. Change the tracking offset value to minimize the number and use that tracking offset value. This makes it possible to configure a tracking servo control device that minimizes the number of errors in the reproduced signal.
- the optimum tracking offset value can be detected at high speed.
- the optimum tracking offset can be performed without making the user aware of the detection time of the optimum tracking offset value.
- the detection of the optimum tracking offset value can be performed when the tracking servo control device is started.
- the optimum tracking offset value can be detected regardless of whether the medium is a write-once medium or a recording medium.
- ECC can be used for detecting the optimum tracking offset value, and the optimum tracking offset value can be detected with a simpler configuration. Further, since the information pit formation pattern is constant, it is possible to easily detect the optimum tracking offset value.
- the optimum tracking offset value can be detected even in the information recording-dedicated device or the information recording / reproducing device.
- the reproduction signal based on the reflected light of the light beam from the optical disk, and the LPP is formed outside the irradiation range By changing the tracking offset value using the reproduction signal based on the reflected light in the case, it is possible to provide a tracking servo control method that minimizes the number of errors in the reproduction signal.
- the reproduction signal based on the reflected light from the optical disc and the other direction Tracking servo control that minimizes the number of errors in the reproduction signal by changing the tracking offset value using the reproduction signal based on the reflected light from the optical disk when at least a part of the LPP adjacent to the LPP is formed It is possible to provide a method. According to the method of the present invention, it is possible to provide a method for detecting an optimum tracking offset value even in an information recording-dedicated device or an information recording / reproducing device.
- the reproduction signal based on the reflected light from the optical disk of the light beam, and the LPP is formed outside the irradiation range.
- the reproduction signal based on the reflected light from the optical disk and the other direction Tracking servo control that minimizes the number of errors in the reproduced signal by changing the tracking offset value using the reproduced signal based on the reflected light from the optical disk when at least a part of the LPP adjacent to the optical disk is formed It will be possible to provide a method. .
- the program By pre-recording the program of the present application on an information recording medium such as a flexible disk, or acquiring and recording the program in advance through a network such as the Internet, the program is read out and executed by a general-purpose microcomputer or the like.
- the general-purpose microcomputer or the like may function as the microcomputer 9 according to the embodiment.
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003296129A AU2003296129A1 (en) | 2003-01-22 | 2003-12-25 | Information recording medium and information recording device |
EP03786327A EP1587083A4 (en) | 2003-01-22 | 2003-12-25 | MEDIA AND DEVICE FOR INFORMATION RECORDING |
US10/542,853 US20060120232A1 (en) | 2003-01-22 | 2003-12-25 | Information recording medium and information recording device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003-13615 | 2003-01-22 | ||
JP2003013615A JP4295998B2 (ja) | 2003-01-22 | 2003-01-22 | トラッキングサーボ制御装置、及びトラッキングサーボ制御用プログラム |
Publications (1)
Publication Number | Publication Date |
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WO2004066289A1 true WO2004066289A1 (ja) | 2004-08-05 |
Family
ID=32767364
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2003/016811 WO2004066289A1 (ja) | 2003-01-22 | 2003-12-25 | 情報記録媒体及び情報記録装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US20060120232A1 (ja) |
EP (1) | EP1587083A4 (ja) |
JP (1) | JP4295998B2 (ja) |
CN (2) | CN1742329A (ja) |
AU (1) | AU2003296129A1 (ja) |
WO (1) | WO2004066289A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101751944B (zh) * | 2008-11-27 | 2012-05-23 | 日立乐金资料储存股份有限公司 | 光盘装置及其聚焦偏置设定方法 |
Citations (2)
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JPH10149543A (ja) * | 1996-11-14 | 1998-06-02 | Sharp Corp | 光記録媒体およびトラッキング装置 |
JP2002260237A (ja) * | 2001-03-02 | 2002-09-13 | Victor Co Of Japan Ltd | 光ディスク装置 |
Family Cites Families (14)
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JP3063598B2 (ja) * | 1995-12-01 | 2000-07-12 | 三菱電機株式会社 | 光ディスクおよび光ディスク装置 |
JPH09171625A (ja) * | 1995-12-20 | 1997-06-30 | Nikon Corp | 情報再生装置 |
US5852599A (en) * | 1996-01-26 | 1998-12-22 | Sharp Kabushiki Kaisha | Optical recording medium and optical recording/reproducing device, and manufacturing method of optical recording medium |
JP2000113463A (ja) * | 1998-09-30 | 2000-04-21 | Pioneer Electronic Corp | プリピット検出装置 |
JP3872235B2 (ja) * | 1998-10-21 | 2007-01-24 | パイオニア株式会社 | プリピット検出装置 |
US6754157B2 (en) * | 2000-08-07 | 2004-06-22 | Victor Company Of Japan, Limited | Recording and/or reproducing apparatus and recording and/or reproducing method capable of detecting a land pre-pit on disc securely at a high precision |
JP4136293B2 (ja) * | 2000-08-10 | 2008-08-20 | パイオニア株式会社 | 光学式記録媒体並びにその製造方法及び製造装置 |
JP3791776B2 (ja) * | 2001-02-06 | 2006-06-28 | パイオニア株式会社 | 光記録媒体のプリピット検出装置 |
JP3591468B2 (ja) * | 2001-02-26 | 2004-11-17 | ティアック株式会社 | 光ディスク装置 |
JP3792169B2 (ja) * | 2001-03-19 | 2006-07-05 | パイオニア株式会社 | 光学式記録媒体の記録装置 |
JP3665588B2 (ja) * | 2001-04-20 | 2005-06-29 | 株式会社東芝 | ディスク、ディスク装置及びトラックセンター検出方法 |
US6744721B2 (en) * | 2001-05-11 | 2004-06-01 | Matsushita Electric Industrial Co., Ltd. | Optical disk drive |
TW581119U (en) * | 2001-12-19 | 2004-03-21 | Univ Nat Cheng Kung | Petri dish for microscope |
JP3808785B2 (ja) * | 2002-02-21 | 2006-08-16 | 株式会社東芝 | プリピット信号生成回路、半導体集積回路、記録再生装置、プリピット信号生成方法 |
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2003
- 2003-01-22 JP JP2003013615A patent/JP4295998B2/ja not_active Expired - Fee Related
- 2003-12-25 AU AU2003296129A patent/AU2003296129A1/en not_active Abandoned
- 2003-12-25 WO PCT/JP2003/016811 patent/WO2004066289A1/ja active Application Filing
- 2003-12-25 CN CN200380109111.6A patent/CN1742329A/zh active Pending
- 2003-12-25 EP EP03786327A patent/EP1587083A4/en not_active Withdrawn
- 2003-12-25 CN CNA2006100923426A patent/CN1877713A/zh active Pending
- 2003-12-25 US US10/542,853 patent/US20060120232A1/en not_active Abandoned
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JPH10149543A (ja) * | 1996-11-14 | 1998-06-02 | Sharp Corp | 光記録媒体およびトラッキング装置 |
JP2002260237A (ja) * | 2001-03-02 | 2002-09-13 | Victor Co Of Japan Ltd | 光ディスク装置 |
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CN101751944B (zh) * | 2008-11-27 | 2012-05-23 | 日立乐金资料储存股份有限公司 | 光盘装置及其聚焦偏置设定方法 |
Also Published As
Publication number | Publication date |
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US20060120232A1 (en) | 2006-06-08 |
EP1587083A4 (en) | 2008-12-10 |
CN1877713A (zh) | 2006-12-13 |
JP4295998B2 (ja) | 2009-07-15 |
JP2004227653A (ja) | 2004-08-12 |
AU2003296129A1 (en) | 2004-08-13 |
CN1742329A (zh) | 2006-03-01 |
EP1587083A1 (en) | 2005-10-19 |
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