WO2009101796A1 - 光ディスクの検査方法および光ディスク媒体 - Google Patents
光ディスクの検査方法および光ディスク媒体 Download PDFInfo
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- WO2009101796A1 WO2009101796A1 PCT/JP2009/000532 JP2009000532W WO2009101796A1 WO 2009101796 A1 WO2009101796 A1 WO 2009101796A1 JP 2009000532 W JP2009000532 W JP 2009000532W WO 2009101796 A1 WO2009101796 A1 WO 2009101796A1
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- signal quality
- quality index
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- optical disc
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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
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0045—Recording
- G11B7/00458—Verification, i.e. checking data during or after recording
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10305—Improvement or modification of read or write signals signal quality assessment
- G11B20/10314—Improvement or modification of read or write signals signal quality assessment amplitude of the recorded or reproduced signal
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10305—Improvement or modification of read or write signals signal quality assessment
- G11B20/10361—Improvement or modification of read or write signals signal quality assessment digital demodulation process
- G11B20/10379—Improvement or modification of read or write signals signal quality assessment digital demodulation process based on soft decisions, e.g. confidence values, probability estimates, likelihoods values or path metrics of a statistical decoding algorithm
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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
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
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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
- G11B7/007—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
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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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
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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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
- G11B7/268—Post-production operations, e.g. initialising phase-change recording layers, checking for defects
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B2020/10935—Digital recording or reproducing wherein a time constraint must be met
- G11B2020/10981—Recording or reproducing data when the data rate or the relative speed between record carrier and transducer is variable
- G11B2020/1099—Recording or reproducing data when the data rate or the relative speed between record carrier and transducer is variable wherein a disc is spun at a variable speed
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/21—Disc-shaped record carriers characterised in that the disc is of read-only, rewritable, or recordable type
- G11B2220/215—Recordable discs
- G11B2220/218—Write-once discs
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
- G11B2220/2537—Optical discs
- G11B2220/2541—Blu-ray discs; Blue laser DVR discs
Definitions
- the present invention relates to an optical disc inspection method and an optical disc medium suitable for high-speed recording.
- CD-R, DVD-R, BD on which data can be additionally recorded on a recording medium that can optically record data and reproduce the recorded data (hereinafter simply referred to as an optical disc in the present specification).
- a recording medium that can optically record data and reproduce the recorded data
- All these optical discs have a standard recording speed.
- the recording speed is specifically indicated by a linear speed or a transfer rate. In the present specification, the recording speed will be described mainly using the linear velocity.
- BD-R is currently in practical use as a disc and recording apparatus capable of recording at 4 ⁇ speed.
- An optical disc capable of recording at higher speed is also under development.
- ⁇ double speed means how many times the standard speed of recording is.
- optical disk manufacturers and verification organizations inspect whether or not the optical disk has predetermined characteristics suitable for high-speed recording. For example, test recording is actually performed on the inner, middle, and outer tracks of the sample optical disk to check whether the signal quality index value of the reproduction signal is within a predetermined range. Only optical discs that pass this inspection are shipped as products.
- the current technical level is the optical disk in consideration of the rotational performance of the spindle motor, noise, safety against disk destruction, and the like. It is desirable to use at a rotational speed of about 10,000 rpm or less.
- the optical disk is rotated at the same rotational speed, the linear velocity of recording obtained at the inner periphery with a small radius is smaller than that at the outer periphery with a large radius. For these reasons, when the maximum recording speed of the optical disc is increased, the rotational speed becomes too high on the inner track having a small radius, and high-speed data recording becomes difficult.
- the rotational speed reaches about 9800 rpm. Furthermore, when the recording speed is set to 6 times or higher, the rotational speed at a position near a radius of 24 mm exceeds 12000 rpm.
- the conventional optical disc inspection method uses a high speed on the inner track where the rotational speed of the disc increases. There was a problem that the signal quality index value of the recording could not be inspected.
- An object of the present invention is to solve such a problem and to provide an optical disc inspection method and an optical disc in which quality is guaranteed to guarantee the quality in high-speed recording on an inner track that is usually difficult to inspect. .
- the optical disc inspection method of the present invention includes a first radial position of the optical disc, a second radial position located on the inner circumferential side from the first radial position, and a third radial position located on the inner circumferential side from the second radial position.
- the optical disc inspection method calculates the signal quality index value F and then checks whether the signal quality index values A, B, C, D, E, and F are below a predetermined value. It further includes a step.
- the optical disc inspection method of the present invention includes a first radial position of the optical disc, a second radial position located on the inner circumferential side from the first radial position, and a third radial position located on the inner circumferential side from the second radial position.
- the optical disc inspection method calculates the signal quality index value H, and then determines whether the signal quality index values A, B, C, D, E, F, G, and H are equal to or less than a predetermined value. It further includes the step of confirming whether or not.
- the signal quality index value F is C + EB or (C 2 + E 2 -B 2 ) 0.5 .
- the signal quality index value H is E + GD or (E 2 + G 2 ⁇ D 2 ) 0.5 .
- the signal quality index value is a binarized jitter value.
- the signal quality index value is a PRML error correlation value.
- the standard recording power and recording pulse conditions at the recording speed V1 and the standard recording power and recording pulse conditions at the recording speed V2 higher than the V1 are stored in advance in the lead-in area.
- the signal quality index values at the recording speed V1 and the recording speed V2 are less than or equal to a predetermined value. Become.
- the optical disc of the present invention has a standard recording power and recording pulse condition at a recording speed V1 where V3> V2> V1, a standard recording power and recording pulse condition at a recording speed V2, and a standard recording power at a recording speed V3.
- Recording pulse conditions are stored in advance in the lead-in area of the optical disk medium, and when the optical disk inspection method defined in claim 3 or 4 is performed using the standard recording power and recording pulse conditions,
- the signal quality index values at the recording speed V1, the recording speed V2, and the recording speed V3 are below a predetermined value.
- the optical disk inspection method of the present invention it is possible to provide a highly reliable optical disk that guarantees the signal quality of high-speed recording in the inner periphery, which is usually difficult to inspect. Further, according to the optical disk of the present invention, a performance margin in a disk device capable of recording or reproducing at a high speed can be ensured, and compatibility between devices is improved.
- FIG. 1 is a block diagram of a disk device that executes an optical disk inspection method according to the present invention.
- FIG. 1 schematically shows a track layout of an optical disc according to the present invention.
- 3 schematically shows a relationship between a signal quality index value measured and calculated by an optical disc inspection method according to the present invention and a radial position.
- FIG. 1 is a block diagram of a disk device for carrying out an optical disk inspection method according to the present invention.
- the apparatus shown in FIG. 1 includes a motor 2, an optical head 3, a traverse mechanism 5, a reproduction signal processing unit 6, and a recording signal processing unit 8. Moreover, the system controller 10 which is a control part is provided. The system controller 10 receives various information from each component via the control bus 11 and controls each component.
- the motor 2 mounts the optical disc 100 and rotates the optical disc 100 at a predetermined rotational speed based on a command from the system controller 10.
- the optical head 3 includes a light source and irradiates the optical disc 100 with a light beam 4 emitted from the light source to record data. Further, the optical beam 100 is irradiated onto the optical disc 100 during reproduction, and the reflected light modulated based on the mark and space formed on the optical disc 100 is detected to generate a reproduction signal.
- the traverse mechanism 5 moves the optical head 3 in the radial direction of the optical disc 100 so that the light beam 4 irradiates a track to be recorded or reproduced.
- the recording signal processing unit 8 generates a recording signal 9 for trial writing to inspect the optical disc 100 and outputs it to the optical head 3.
- the recording signal processing unit 8 includes a recording condition setting unit 12 for generating a random signal including a plurality of pulses in which marks and spaces having a plurality of lengths defined by a modulation rule are generated with a random probability. Set the light source drive conditions.
- the reproduction signal processing unit 6 detects the characteristics of the reproduction signal 7 obtained from the optical head 3.
- the reproduction signal processing unit 6 includes a signal index measurement unit 13 and measures the signal quality index value of the reproduction signal 7.
- the signal quality index value an index value that directly represents the superiority or inferiority of the overall characteristics of the optical disc 3 is preferably used, and a binarized jitter value of the reproduced random signal is preferable.
- PRML Partial Response Maximum Maximum Liquor Hood
- MLSE Maximum Likely Food Sequence Error
- SAM Sequenced Amplitude Margin
- FIG. 2 shows a track layout of the optical disc 100 of the present invention to be inspected using the optical disc inspection method of the present invention.
- the optical disc 100 includes a lead-in area 101 provided on the inner periphery side and a user data track 102 provided on the outer periphery side of the lead-in area 101.
- the user data track 102 is a track for recording data desired by the user.
- the portion where the user data track 102 is provided is also called a data area.
- the optical disc 100 may be a write-once type or a rewritable type.
- the optical disc 100 is of the write-once type, the data once recorded on the user data track 102 cannot be rewritten, but additional data can be written in the area where the data of the user data track 102 is not recorded.
- the optical disc 100 is a rewritable type, the data recorded on the user data track 102 can be rewritten.
- the inspection of the optical disc 100 is performed in the first radial position and the first radial position of the user data track 102. This is performed at the second radial position located on the circumferential side and the third radial position located on the inner circumferential side relative to the second radial position.
- the first radial position, the second radial position, and the third radial position are r1, r2, and r3, respectively, the relationship r1> r2> r3 is satisfied.
- r1, r2 and r3 are preferably 57 mm ⁇ r1 ⁇ 59 mm, 40 mm ⁇ r2 ⁇ 42 mm, and 23 mm ⁇ r3 ⁇ 25 mm, respectively.
- the first radial position, the second radial position, and the third radial position are referred to as an outer circumferential track, a middle circumferential track, and an inner circumferential track.
- the disk device shown in FIG. 1 may be realized as a device dedicated to the inspection of the optical disk 100, or in addition to the inspection of the optical disk 100, arbitrary user data may be recorded and the recorded data may be reproduced. You may implement
- Each procedure of this method is stored as a computer-readable program (firmware) in, for example, an information recording medium such as an EEPROM or a RAM provided in the system controller 10.
- the system controller 10 reads a program that defines this procedure, and controls each component according to the procedure.
- Step 1 The optical head 3 is moved by the traverse mechanism 5 so that the light beam 4 emitted from the head 3 irradiates the outer track of the optical disk 1.
- the optical disk 100 is rotated by the motor 2 so that the recording speed (linear velocity) V1 is obtained in the outer track of the optical disk 100.
- Step 2 Predetermined data is recorded on the outer track of the optical disc 100. More specifically, the recording power setting unit 12 of the recording signal processing unit 8 sets the recording power and recording pulse conditions for the recording speed V1, drives the light source of the optical head 3 under the set conditions, and the light beam 4 is irradiated onto the optical disc 100. As a result, a plurality of marks having random mark lengths and space lengths corresponding to random signals are formed on the outer track of the optical disc 100.
- Step 3 The data recorded on the outer track of the optical disc 100 is reproduced and the signal quality index value is measured. Specifically, the optical disk 100 is rotated by the motor 2 so that the optical disk 100 has a reproduction speed V0 in the outer track.
- the reproduction speed V0 is equal to or lower than the recording speed V1 (a low reference speed that satisfies V0 ⁇ V1).
- a light beam 4 having a reproduction intensity is emitted from the optical head 3 to irradiate the outer peripheral track of the optical disc 100.
- the optical head 3 detects reflected light modulated based on the mark and space formed on the optical disc 100, and generates a reproduction signal 7.
- the signal index measurement unit 13 of the reproduction signal processing unit 6 measures the signal quality index value of the reproduction signal 7.
- the obtained index value A is stored in a memory in the system controller 10, for example.
- Step 4 The optical head 3 is moved by the traverse mechanism 5 so that the light beam 4 emitted from the head 3 irradiates the intermediate track of the optical disk 1.
- the optical disk 100 is rotated by the motor 2 so that the recording speed V1 is obtained in the middle track of the optical disk 100.
- Step 5 A plurality of marks having random mark lengths and space lengths corresponding to random signals are formed in the middle track of the disk 100 by the same procedure as in step 2.
- Step 6 By the same procedure as in Step 3, the data recorded on the middle track of the optical disc 100 is reproduced at the reproduction speed V0, and the signal quality index value of the reproduction signal 7 is measured.
- the obtained index value B is stored in the memory in the system controller 10.
- Step 7 The optical head 3 is moved by the traverse mechanism 5 so that the light beam 4 emitted from the head 3 irradiates the inner peripheral track of the optical disk 1. Further, the optical disk 100 is rotated by the motor 2 so that the recording speed V1 is obtained in the inner circumferential track of the optical disk 100.
- Step 8 A plurality of marks having random mark lengths and space lengths corresponding to random signals are formed on the inner circumferential track of the disk 100 by the same procedure as in step 2.
- Step 9 The data recorded on the inner track of the optical disc 100 is reproduced at the reproduction speed V0 by the same procedure as in Step 3, and the signal quality index value of the reproduction signal 7 is measured.
- the obtained index value C is stored in the memory in the system controller 10.
- Step 10 The optical head 3 is moved by the traverse mechanism 5 so that the light beam 4 emitted from the head 3 irradiates the outer track of the optical disk 1. Further, the optical disk 100 is rotated by the motor 2 so that the recording speed V2 is obtained in the outer track of the optical disk 100.
- the recording speed V2 is set larger than the recording speed V1 (V2> V1).
- Step 11 A plurality of marks having random mark lengths and space lengths corresponding to random signals are formed on the outer circumferential track of the disk 100 by the same procedure as in step 2.
- Step 12 The data recorded on the outer track of the optical disc 100 is reproduced at the reproduction speed V0 by the same procedure as in step 3, and the signal quality index value of the reproduction signal 7 is measured.
- the obtained index value D is stored in the memory in the system controller 10.
- Step 13 The optical head 3 is moved by the traverse mechanism 5 so that the light beam 4 emitted from the head 3 irradiates the intermediate track of the optical disk 1. Further, the optical disk 100 is rotated by the motor 2 so that the recording speed V2 is obtained in the middle track of the optical disk 100.
- Step 14 A plurality of marks having random mark lengths and space lengths corresponding to random signals are formed in the middle track of the disk 100 by the same procedure as in step 2.
- Step 15 By the same procedure as in Step 3, the data recorded on the middle track of the optical disc 100 is reproduced at the reproduction speed V0, and the signal quality index value of the reproduction signal 7 is measured.
- the obtained index value E is stored in a memory in the system controller 10.
- Step 16 In the system controller 10, based on the difference between the signal quality index values B and E, a value obtained by correcting the signal quality index value C is recorded on the inner track of the optical disc 100 at the recording speed V2, and a random signal is recorded.
- Step 17 The optical head 3 is moved by the traverse mechanism 5 so that the light beam 4 emitted from the head 3 irradiates the outer track of the optical disk 1.
- the optical disk 100 is rotated by the motor 2 so that the recording speed is 3 in the outer track of the optical disk 100.
- the recording speed V3 is set higher than the recording speed V2 (V3> V2).
- Step 18 A plurality of marks having random mark lengths and space lengths corresponding to random signals are formed on the outer circumferential track of the disk 100 by the same procedure as in step 2.
- Step 19 The data recorded on the outer track of the optical disc 100 is reproduced at the reproduction speed V0 by the same procedure as in step 3, and the signal quality index value of the reproduction signal 7 is measured.
- the obtained index value G is stored in a memory in the system controller 10.
- Step 20 In the system controller 10, based on the difference between the signal quality index values G and D, a value obtained by correcting the signal quality index value E is recorded on the middle track of the optical disc 100 at the recording speed V3.
- the signal quality index value obtained when the data is reproduced Specifically, G 2 -D 2 is calculated, added to E 2 , and then the square root is obtained. That is, (E 2 + G 2 ⁇ D 2 ) 0.5 is calculated and the value is set as the signal index value H.
- Step 21 In the system controller 10, based on the difference between the signal quality index values G and A, a value obtained by correcting the signal quality index value C is recorded as a random signal on the inner track of the optical disc 100 at the recording speed V3.
- the signal quality index value obtained when the data is reproduced Specifically, G 2 -A 2 is calculated and added to C 2 , and then the square root is obtained. That is, (C 2 + G 2 ⁇ A 2 ) 0.5 is calculated and the value is set as the signal index value I.
- Step 22 In the system controller 10, the measured signal quality index values A, B, C, D, E, G and the signal quality index values F, H, I obtained by calculation are compared with a predetermined value, and the optical disc 100 determines a predetermined signal. Determining whether the quality index is met. Specifically, when the signal quality index values A, B, C, D, E, F, G, H, and I are all equal to or lower than a predetermined value, the system controller 10 determines that the optical disk 100 is predetermined when the recording speed is V3 or lower. A signal indicating that the signal quality is provided is output to the outside. Alternatively, a display indicating that the optical disc 100 has a predetermined signal quality at a recording speed V3 or lower is performed on a display device (not shown) provided in the disc device shown in FIG.
- steps 1 to 22 are not necessarily performed in this order, and the order may be changed as long as the recording / reproducing signal quality index value necessary for the inspection is obtained.
- step 16 may be performed after steps 18 and 19.
- a BD-R is used for the optical disc 100.
- the linear velocity higher than the standard linear velocity is generally a positive integer multiple of the standard linear velocity, but is not limited to an integer and may be a positive real multiple. Also, a linear velocity that is slower than the standard linear velocity, such as 0.5 times (0.5x), may be defined. Accordingly, the recording speed is similarly defined as 2 ⁇ speed, 4 ⁇ speed, etc., but a speed such as 0.5 ⁇ speed or 4.5 ⁇ speed can also be defined.
- a position near a radius of 24 mm is used as an inner track
- a position near a radius of 41 mm is used as a middle track
- a position near a radius of 58 mm is used as an outer track.
- the recording speeds V1, V2, and V3 are set to 4 ⁇ , 6 ⁇ , and 10 ⁇ speeds of BD, respectively.
- signal quality index values A to I are obtained.
- Table 1 shows the signal quality index value and the rotation speed for each recording speed at each radial position.
- Table 1 shows the position and recording speed on the optical disc 100 where the signal quality index values A to I are calculated in parentheses beside the signal quality index values A to I. Such notation is the same in the following figures and tables.
- the rotation speed at each radial position does not exceed 10,000 rpm, and therefore the signal quality index value A in all of the outer track, the middle track, and the inner track. , B and C can be actually measured.
- the rotation speed exceeds 10,000 rpm on the inner track and the inner track at the recording speed of 6 ⁇ and at the recording speed of 10 ⁇ , it is difficult to measure the signal quality index value.
- FIG. 3 shows the relationship between the measurement result of the signal quality index value and the signal quality index value obtained by calculation and the radial position.
- the horizontal axis indicates the radial position
- the vertical axis indicates the signal quality index value.
- Circle marks, triangle marks, and square marks indicate signal quality index values at recording speeds of V1 (4 ⁇ speed), V2 (6 ⁇ speed), and 10 ⁇ speed, respectively. The white outlines of these marks indicate calculated values, and the black indicates actually measured values.
- the signal quality index value is actually measured at the recording speed and the radial position where measurement is possible, and the signal quality index value is measured at the inner peripheral side position where the rotation speed exceeds 10,000 rpm and measurement is difficult. Is calculated.
- signal quality index values are obtained by measurement or calculation, and can be compared with predetermined values. More specifically, the pass / fail judgment of each item is performed using the inspection items as shown in Table 2.
- a jitter value obtained by binarizing a reproduction random signal is used as a signal quality index value, and the jitter value is verified at recording speeds of 4 ⁇ , 6 ⁇ , and 10 ⁇ speeds.
- the same value is used as the predetermined value. For example, if the jitter value is 7% or less, it is determined that a prescribed signal quality is obtained.
- ⁇ indicates that the signal quality index value is less than or equal to a predetermined value
- ⁇ indicates that it is greater than the predetermined value
- the signal quality index value F in the inner track at the recording speed of 6 ⁇ is obtained by calculation. As described in step 16, the signal quality index value F is actually measured. This is obtained by correcting the signal quality index value C.
- the signal quality of the optical disc 100 depends on the physical structure of the optical disc 100 at the position where the measurement is performed. Therefore, even if the signal quality index value in the inner track cannot be measured at the recording speed of 6 ⁇ speed, it is calculated based on the signal quality index value C in the inner track actually measured at the recording speed of 4 ⁇ speed.
- the measured signal quality index value F is considered to be in good agreement with the signal quality index value obtained when the measurement is actually performed.
- the optical disc 100 stores in advance the recording conditions used in the inspection for this purpose, that is, the recording power and recording pulse conditions for each recording speed in the lead-in area 101 shown in FIG. 2 as standard recording conditions for the optical disc. is doing.
- the lead-in area 101 is provided in a read-only area using wobbles, pits, and the like of track grooves on the inner periphery of the disc. Specific examples of recording power and recording pulse conditions for each recording speed stored in the lead-in area 101 are shown in Table 3.
- standard recording power and recording pulse conditions at a recording speed V1 where V3> V2> V1 are assigned to information of about 100 bytes from the header to the footer for each condition set serial number.
- Table 3 shows an example of conditions for 4 ⁇ speed when the condition set serial number is I, conditions for 6 ⁇ speed when the condition set serial number is J, and conditions for 10 ⁇ speed when the condition set serial number is K.
- the disk device used by the user moves the optical head to the lead-in area 101 and stores the above-mentioned recording speeds stored in the lead-in area 101 as DI (disc information).
- the recording power and recording pulse conditions are read and these conditions are set in the disk device.
- the recording is performed under the same conditions as when the optical disc 100 was inspected. Therefore, the signal quality when reproducing the recorded data is The same as when 100 was inspected. In other words, when the optical disc 100 is inspected, the signal quality index value is surely below the predetermined value. By using such an optical disc 100, the optical disc 100 exhibits more reliably guaranteed performance.
- the present invention it is possible to provide the market with a highly reliable optical disk that guarantees the signal quality of high-speed recording in the inner periphery, which is usually difficult to inspect. Furthermore, the necessary recording conditions stored in the lead-in area when loaded in the drive device to be used are set in the device. Therefore, the performance inspected by the manufacturer or the verification organization is sufficiently reproduced in the market, and the compatibility between the disk devices is increased.
- the recording speeds V1, V2, and V3 are set to 4 ⁇ , 6 ⁇ , and 10 ⁇ speeds of BD, respectively.
- the upper limit of the disk rotation speed is allowed to 12000 rpm, for example, 6 ⁇ speed of BD
- the speed may be 8 or 10 times speed, or 12 or 14 times speed.
- Table 4 shows the relationship between each signal index value and the recording speed in this case.
- the signal quality index value can be measured at all of the outer circumference, the middle circumference, and the inner circumference.
- the rotation speed exceeds 12000 rpm at the inner circumference at the 8 ⁇ or 10 ⁇ recording speed and at the middle and inner circumferences at the 12 ⁇ or 14 ⁇ speed.
- the signal quality index value can be obtained by calculation, and the characteristics r of the optical disc are ensured by inspecting the items shown in Table 4 using the calculated value. Can do.
- the quality index value I may be obtained.
- the signal quality index value I is obtained by calculation in step 21 and it is confirmed in step 22 that the signal quality index value I is not more than a predetermined value including the signal quality index value I.
- the rotation speed is extremely high at the inner peripheral portion and it is a fundamental condition that cannot normally be used, it may be excluded from the inspection items.
- the quality is guaranteed at the same predetermined value (for example, 7%) with respect to the signal quality index values measured or calculated at different recording speeds and measurement radial positions. This is to ensure equivalent signal quality at any available recording speed and any position in the user data track on the optical disc 100.
- the predetermined value may be varied according to the recording speed or the measurement radius position.
- the system controller of the disk device determines whether or not the signal quality index value is less than or equal to the predetermined value, but the signal quality index value is compared with the predetermined value. Whether the measured signal quality index value and the signal quality index value obtained by calculation are equal to or lower than a predetermined value may be checked by an operator of the disk device.
- optical disc inspection method and optical disc according to the present invention are suitably used for optical discs that perform recording and reproduction at high speed. Further, the present invention suitably corresponds to a disk device capable of high-speed recording / reproduction.
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Abstract
Description
3 ヘッド
6 再生信号処理部
8 記録信号処理部
10 システムコントローラ
100 光ディスク
トラバース機構5によって、ヘッド3から出射する光ビーム4が光ディスク1の外周トラックを照射するように光ヘッド3を移動させる。また、モータ2によって、光ディスク100の外周トラックにおいて記録速度(線速度)V1となるように光ディスク100を回転させる。
光ディスク100の外周トラックに所定のデータを記録する。より具体的には、記録信号処理部8の記録条件設定部12によって、記録速度V1用の記録パワーと記録パルス条件を設定し、設定された条件で光ヘッド3の光源を駆動し、光ビーム4を光ディスク100に照射する。これにより、光ディスク100の外周トラックにおいて、ランダム信号に対応する、マーク長およびスペース長がランダムである複数のマークを形成する。
光ディスク100の外周トラックに記録されたデータを再生し、信号品質指標値を測定する。具体的には、モータ2によって、光ディスク100を外周トラックにおいて再生速度V0となるように光ディスク100を回転させる。再生速度V0は記録速度V1以下(V0≦V1となる低速の基準速度)である。
トラバース機構5によって、ヘッド3から出射する光ビーム4が光ディスク1の中周トラックを照射するように光ヘッド3を移動させる。また、モータ2によって、光ディスク100の中周トラックにおいて記録速度V1となるように光ディスク100を回転させる。
ステップ2と同様の手順によって、ディスク100の中周トラックにおいて、ランダム信号に対応する、マーク長およびスペース長がランダムである複数のマークを形成する。
ステップ3と同様の手順によって、光ディスク100の中周トラックに記録されたデータを再生速度V0で再生し、再生信号7の信号品質指標値を測定する。得られた指標値Bをシステムコントローラ10内のメモリに記憶する。
トラバース機構5によって、ヘッド3から出射する光ビーム4が光ディスク1の内周トラックを照射するように光ヘッド3を移動させる。また、モータ2によって、光ディスク100の内周トラックにおいて記録速度V1となるように光ディスク100を回転させる。
ステップ2と同様の手順によって、ディスク100の内周トラックにおいて、ランダム信号に対応する、マーク長およびスペース長がランダムである複数のマークを形成する。
ステップ3と同様の手順によって、光ディスク100の内周トラックに記録されたデータを再生速度V0で再生し、再生信号7の信号品質指標値を測定する。得られた指標値Cをシステムコントローラ10内のメモリに記憶する。
トラバース機構5によって、ヘッド3から出射する光ビーム4が光ディスク1の外周トラックを照射するように光ヘッド3を移動させる。また、モータ2によって、光ディスク100の外周トラックにおいて記録速度V2となるように光ディスク100を回転させる。記録速度V2は記録速度V1よりも大きく設定する(V2>V1)。
ステップ2と同様の手順によって、ディスク100の外周トラックにおいて、ランダム信号に対応する、マーク長およびスペース長がランダムである複数のマークを形成する。
ステップ3と同様の手順によって、光ディスク100の外周トラックに記録されたデータを再生速度V0で再生し、再生信号7の信号品質指標値を測定する。得られた指標値Dをシステムコントローラ10内のメモリに記憶する。
トラバース機構5によって、ヘッド3から出射する光ビーム4が光ディスク1の中周トラックを照射するように光ヘッド3を移動させる。また、モータ2によって、光ディスク100の中周トラックにおいて記録速度V2となるように光ディスク100を回転させる。
ステップ2と同様の手順によって、ディスク100の中周トラックにおいて、ランダム信号に対応する、マーク長およびスペース長がランダムである複数のマークを形成する。
ステップ3と同様の手順によって、光ディスク100の中周トラックに記録されたデータを再生速度V0で再生し、再生信号7の信号品質指標値を測定する。得られた指標値Eをシステムコントローラ10内のメモリに記憶する。
システムコントローラ10において、信号品質指標値BおよびEの相違に基づいて、信号品質指標値Cを補正することによって求めた値を、記録速度V2で光ディスク100の内周トラックにランダム信号を記録し、再生した場合に得られる信号品質指標値とする。具体的には、E2-B2を算出し、C2に加えた後、その平方根を求める。つまり、(C2+E2-B2)0.5を算出し、その値を信号指標値Fとする。
トラバース機構5によって、ヘッド3から出射する光ビーム4が光ディスク1の外周トラックを照射するように光ヘッド3を移動させる。また、モータ2によって、光ディスク100の外周トラックにおいて記録速度3となるように光ディスク100を回転させる。記録速度V3は記録速度V2よりも大きく設定する(V3>V2)。
ステップ2と同様の手順によって、ディスク100の外周トラックにおいて、ランダム信号に対応する、マーク長およびスペース長がランダムである複数のマークを形成する。
ステップ3と同様の手順によって、光ディスク100の外周トラックに記録されたデータを再生速度V0で再生し、再生信号7の信号品質指標値を測定する。得られた指標値Gをシステムコントローラ10内のメモリに記憶する。
システムコントローラ10において、信号品質指標値GおよびDの相違に基づいて、信号品質指標値Eを補正することによって求めた値を、記録速度V3で光ディスク100の中周トラックにランダム信号を記録し、再生した場合に得られる信号品質指標値とする。具体的には、G2-D2を算出し、E2に加えた後、その平方根を求める。つまり、(E2+G2-D2)0.5を算出し、その値を信号指標値Hとする。
システムコントローラ10において、信号品質指標値GおよびAの相違に基づいて、信号品質指標値Cを補正することによって求めた値を、記録速度V3で光ディスク100の内周トラックにランダム信号を記録し、再生した場合に得られる信号品質指標値とする。具体的には、G2-A2を算出し、C2に加えた後、その平方根を求める。つまり、(C2+G2-A2)0.5を算出し、その値を信号指標値Iとする。
システムコントローラ10において、測定した信号品質指標値A、B、C、D、E、Gおよび計算によって求めた信号品質指標値F、H、Iと所定値とを比較し、光ディスク100が所定の信号品質指標の規定に適合しているかどうかを判定する。具体的には、信号品質指標値A、B、C、D、E、F、G、H、Iがすべて所定値以下である場合、システムコントローラ10は、光ディスク100が記録速度V3以下において、所定の信号品質を備えていることを示す信号を外部へ出力する。あるいは、図1に示すディスク装置に設けられた図示しない表示装置に、光ディスク100が記録速度V3以下において、所定の信号品質を備えていることを示す表示を行う。
Claims (10)
- 光ディスクの第1半径位置、前記第1半径位置より内周側に位置する第2半径位置、および、前記第2半径位置よりも内周側に位置する第3半径位置において、記録速度V1でそれぞれデータを記録し、記録したデータを再生することにより、再生信号の信号品質指標値A、B、Cをそれぞれ測定するステップと、
前記第1半径位置および前記第2半径位置において、V1よりも大きい記録速度V2でそれぞれデータを記録し、記録したデータを再生することにより、再生信号の信号品質指標値D、Eをそれぞれ測定するステップと、
前記信号品質指標値BおよびEの相違に基づいて、前記信号品質指標値Cを補正することにより、前記第3半径位置において、前記速度V2でデータを記録し、記録したデータを再生した場合の信号品質指標値Fを算出するステップと、
を包含する光ディスクの検査方法。 - 前記信号品質指標値Fを算出した後、前記信号品質指標値A、B、C、D、E、Fが所定値以下であるかどうかを確認するステップをさらに包含する請求項1に記載の光ディスクの検査方法。
- 光ディスクの第1半径位置、前記第1半径位置より内周側に位置する第2半径位置、および、前記第2半径位置よりも内周側に位置する第3半径位置において、記録速度V1でそれぞれデータを記録し、記録したデータを再生することにより、再生信号の信号品質指標値A、B、Cをそれぞれ測定するステップと、
前記第1半径位置および前記第2半径位置において、V1よりも大きい記録速度V2でそれぞれデータを記録し、記録したデータを再生することにより、再生信号の信号品質指標値D、Eをそれぞれ測定するステップと、
前記信号品質指標値BおよびEの相違に基づいて、前記信号品質指標値Cを補正することにより、前記第3半径位置において、前記速度V2でデータを記録し、記録したデータを再生した場合の信号品質指標値Fを算出するステップと、
前記第1半径位置において、V2よりも大きい記録速度V3でデータを記録し、記録したデータを再生することにより、再生信号の信号品質指標値Gを測定するステップと、
前記信号品質指標値GおよびDの相違に基づいて、前記信号品質指標値Eを補正することにより、前記第2半径位置において、前記速度V3でデータを記録し、記録したデータを再生した場合の信号品質指標値Hを算出するステップと、
を包含する光ディスクの検査方法。 - 前記信号品質指標値Hを算出した後、前記信号品質指標値A、B、C、D、E、F、G、Hが所定値以下であるかどうかを確認するステップをさらに包含する請求項3に記載の光ディスクの検査方法。
- 前記信号品質指標値Fは、C+E-B、または、(C2+E2-B2)0.5である請求項1から4のいずれかに記載の光ディスクの検査方法。
- 前記信号品質指標値Hは、E+G-D、または、(E2+G2-D2)0.5である請求項3または4に記載の光ディスクの検査方法。
- 前記信号品質指標値は、2値化のジッタ値である請求項1から4のいずれかに記載の光ディスクの検査方法。
- 前記信号品質指標値は、PRMLのエラー相関値である請求項1から4のいずれかに記載の光ディスクの検査方法。
- 記録速度V1における標準の記録パワーおよび記録パルス条件と、前記V1より大きい記録速度V2における標準の記録パワーおよび記録パルス条件とが、リードイン領域に予め記憶されており、前記標準の記録パワーおよび記録パルス条件を用いて、請求項1から6のいずれかに規定される光ディスクの検査方法を実施したとき、記録速度V1と記録速度V2における信号品質指標値が所定値以下となる光ディスク。
- V3>V2>V1となる記録速度V1における標準の記録パワーおよび記録パルス条件と、記録速度V2における標準の記録パワーおよび記録パルス条件と、記録速度V3における標準の記録パワーおよび記録パルス条件とが、光ディスク媒体のリードイン領域に予め記憶されており、前記標準の記録パワーおよび記録パルス条件を用いて、請求項3または4に規定される光ディスクの検査方法を実施したとき、記録速度V1と記録速度V2と記録速度V3における信号品質指標値が所定値以下となる光ディスク。
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Also Published As
Publication number | Publication date |
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MX2009010940A (es) | 2009-10-29 |
EP2244259A1 (en) | 2010-10-27 |
US20090207705A1 (en) | 2009-08-20 |
JPWO2009101796A1 (ja) | 2011-06-09 |
JP5437083B2 (ja) | 2014-03-12 |
KR20100110720A (ko) | 2010-10-13 |
CN101681652B (zh) | 2012-06-27 |
EP2244259A4 (en) | 2011-08-24 |
CA2686881A1 (en) | 2009-08-20 |
BRPI0902890A2 (pt) | 2017-05-30 |
RU2009138050A (ru) | 2011-04-20 |
CN101681652A (zh) | 2010-03-24 |
US7990820B2 (en) | 2011-08-02 |
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