WO2007007796A1 - ランドプリピット信号検出回路およびそれを用いた光ディスク装置ならびに電子機器 - Google Patents
ランドプリピット信号検出回路およびそれを用いた光ディスク装置ならびに電子機器 Download PDFInfo
- Publication number
- WO2007007796A1 WO2007007796A1 PCT/JP2006/313880 JP2006313880W WO2007007796A1 WO 2007007796 A1 WO2007007796 A1 WO 2007007796A1 JP 2006313880 W JP2006313880 W JP 2006313880W WO 2007007796 A1 WO2007007796 A1 WO 2007007796A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- land pre
- detection circuit
- push
- pit
- Prior art date
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/005—Reproducing
-
- 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
-
- 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
-
- 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
- G11B20/10018—Improvement or modification of read or write signals analog processing for digital recording or reproduction
- G11B20/10027—Improvement or modification of read or write signals analog processing for digital recording or reproduction adjusting the signal strength during recording or reproduction, e.g. variable gain amplifiers
-
- 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
- G11B20/10046—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter
-
- 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
- G11B7/005—Reproducing
- G11B7/0053—Reproducing non-user data, e.g. wobbled address, prepits, BCA
-
- 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
-
- 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
- G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
- G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs
- G11B2020/1218—Formatting, e.g. arrangement of data block or words on the record carriers on discs wherein the formatting concerns a specific area of the disc
- G11B2020/1238—Formatting, e.g. arrangement of data block or words on the record carriers on discs wherein the formatting concerns a specific area of the disc track, i.e. the entire a spirally or concentrically arranged path on which the recording marks are located
- G11B2020/1239—Formatting, e.g. arrangement of data block or words on the record carriers on discs wherein the formatting concerns a specific area of the disc track, i.e. the entire a spirally or concentrically arranged path on which the recording marks are located the track being a pregroove, e.g. the wobbled track of a recordable optical disc
-
- 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
- G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
- G11B2020/1264—Formatting, e.g. arrangement of data block or words on the record carriers wherein the formatting concerns a specific kind of data
- G11B2020/1265—Control data, system data or management information, i.e. data used to access or process user data
- G11B2020/1267—Address data
- G11B2020/1268—Address in pregroove [ADIP] information
-
- 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
- G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
- G11B2020/1264—Formatting, e.g. arrangement of data block or words on the record carriers wherein the formatting concerns a specific kind of data
- G11B2020/1265—Control data, system data or management information, i.e. data used to access or process user data
- G11B2020/1267—Address data
- G11B2020/1274—Address data stored in pre-pits, i.e. in embossed pits, ROM marks or prepits
-
- 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
- G11B2220/216—Rewritable discs
-
- 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
-
- 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
- G11B2220/2562—DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs
- G11B2220/2566—DVDs belonging to the minus family, i.e. -R, -RW, -VR
Definitions
- the present invention relates to an optical disc apparatus capable of writing data, and more particularly to a land pre-pit signal detection technique in an optical disc apparatus such as a DVD-R or a DVD-RW.
- optical disc power such as CD (Compact Disc) and DVD (Digital Versatile Disc) has been remarkably spread.
- a wobble formed by meandering at predetermined intervals to manage address information and control rotation A group (groove) called a spiral is formed.
- land pre-pits used as auxiliary information are formed on the land located between adjacent groups.
- the optical disc When writing or reading information necessary for the optical disc in this way, the optical disc is irradiated with laser light and the reflected light is detected by an optical pickup.
- the signal detected by the optical pickup is amplified and output as a push-pull signal on which the wobble signal and the land prepit signal appearing corresponding to the wobble and land prepit described above are superimposed.
- a wobble signal and a land pre-pit signal are detected from the push-pull signal, and address information is managed.
- Patent Documents 1 and 2 disclose techniques for detecting a land pre-pit signal from a push-pull signal.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2003-123260
- Patent Document 2 JP 2005-78686 A
- Patent Document 2 generates a slew rate signal having the same frequency and amplitude as the wobble signal by removing high frequency components from the push-pull signal.
- the land pre-pit signal is detected using a smooth signal obtained by smoothing the slew rate signal as a threshold voltage (slice signal).
- the present invention has been made in view of the above problems, and a comprehensive object thereof is a land pre-pit signal detection circuit capable of detecting a land pre-pit signal with higher accuracy and an optical disc apparatus using the land pre-pit signal detection circuit. On offer.
- An aspect of the present invention relates to a land pre-pit signal detection circuit that extracts a land pre-pit signal as well as a push-pull signal force.
- the land pre-pit signal detection circuit detects the amplitude of a wobble signal included in the push-pull signal, and generates a threshold voltage based on the amplitude of the wobble signal. And a comparator for comparing the threshold voltage and determining the presence or absence of the land pre-pit signal.
- the threshold voltage for detecting the land pre-pit signal changes following the change in the amplitude of the wobble signal, the land pre-pit signal can be detected with high accuracy. Monkey.
- the value voltage generation circuit removes the high-frequency component of the push-pull signal and extracts the wobble signal, and the peak hold circuit that holds the peak value of the wobble signal extracted by the first filter And a second filter that extracts the DC component of the push-pull signal, and a threshold voltage obtained by amplifying the difference between the output of the peak hold circuit and the output of the second filter by multiplying the amplitude of the wobble signal by a predetermined amount. And an amplifier to be generated.
- the amplifier may be a variable gain amplifier. By changing the gain of the amplifier, it responds to the pickup provided in the front stage of the land pre-pit signal detection circuit, the type of optical disk medium to be read or written, or the rotational speed of the optical disk. Therefore, the threshold voltage can be set to an appropriate value.
- the threshold voltage generation circuit may further include a voltage dividing circuit that divides the output of the amplifier and the output of the peak hold circuit, and may output the output of the voltage dividing circuit as a threshold voltage.
- the voltage dividing ratio of the voltage dividing circuit may be configured to be adjustable.
- the threshold voltage can be reliably set higher than the maximum value of the wobble signal.
- the land pre-pit signal detection circuit may be integrated on a single semiconductor substrate.
- Integrated integration includes the case where all of the circuit components are formed on a semiconductor substrate and the case where the main components of the circuit are integrated, and is used for adjusting circuit constants.
- a resistor, a capacitor, etc. are provided outside the semiconductor substrate.
- Another embodiment of the present invention is an optical disc apparatus.
- This apparatus includes a pickup for reading information written on the disc, and the above-described land pre-pit signal detection circuit for detecting a land pre-pit signal from a push-pull signal read by the pickup.
- the land pre-pit signal can be detected with high accuracy.
- the land pre-pit signal detection circuit according to the present invention can detect a land pre-pit signal with high accuracy.
- FIG. 1 is a circuit diagram showing a configuration of a land pre-pit signal detection circuit according to the present embodiment.
- FIG. 2 is a block diagram showing a configuration of an optical disc apparatus using the land pre-pit signal detection circuit of FIG.
- FIG. 3 (a) to (c) are operation waveform diagrams of the land pre-pit signal detection circuit of FIG.
- FIG. 4 is a circuit diagram showing a modification of the land pre-pit signal detection circuit of FIG.
- FIG. 5 is an operation waveform diagram of the land pre-pit signal detection circuit of FIG.
- FIG. 1 is a circuit diagram showing a configuration of a land pre-pit signal detection circuit 100 according to the present embodiment.
- FIG. 2 is a block diagram showing a configuration of an optical disc apparatus 200 using the land pre-pit signal detection circuit 100 of FIG.
- the optical disk device 200 of FIG. 2 is built in an electronic device such as a personal computer or a DVD recorder, and is used for recording and reproducing video, audio data, and other digital data.
- the optical disc apparatus 200 includes a spindle motor 202, an optical disc 210, a pickup 204, a land pre-pit signal detection circuit 100, and a control unit 206.
- the pickup 204 irradiates the optical disc 210 with laser light, detects the reflected light, and amplifies it, thereby reading the data recorded on the optical disc 210 as an electrical signal. More specifically, a group formed on the optical disc 210 and a land adjacent to the group are irradiated with laser light to detect a push-pull signal SigPP in which a wobble signal and a land pre-pit signal on the land are superimposed. And output to the land pre-pit signal detection circuit 100.
- the land pre-pit signal detection circuit 100 extracts the land pre-pit signal SigLPP from the push-pull signal SigPP and outputs it to the control unit 206.
- the control unit 206 acquires address information and the like from the land pre-pit signal SigLPP, and controls the spindle motor 202 and the pickup 204.
- the land pre-pit signal detection circuit according to the present embodiment The configuration of 100 will be described in detail.
- the land pre-pit signal detection circuit 100 detects the land pre-pit signal SigLPP from the push-pull signal SigPP input to the input terminal 102 and outputs it from the output terminal 104.
- the land pre-pit signal detection circuit 100 is integrated on a single semiconductor substrate.
- the land pre-pit signal detection circuit 100 may be configured as a single LSI alone, or may be configured as an analog front end (AFE) circuit in which front and rear functional blocks are integrated.
- AFE analog front end
- the land pre-pit signal detection circuit 100 includes a threshold voltage generation circuit 10 and a comparator.
- the threshold voltage generation circuit 10 detects the amplitude of the wobble signal SigWBL included in the push-pull signal SigPP, and generates the threshold voltage Vth based on the detected amplitude of the wobble signal SigWBL.
- the threshold voltage generation circuit 10 includes a first filter 12, a peak hold circuit 14, and a second filter.
- the first filter 12 removes the high-frequency component of the push-pull signal SigPP, and the wobble signal
- the cutoff frequency of the first filter 12 is the land pre-pit signal Sig
- the peak hold circuit 14 holds the peak value of the wobble signal SigWBL extracted by the first filter 12.
- the output signal of the peak hold circuit 14 is the peak signal Sig 1.
- the second filter 16 extracts a DC component of the push-pull signal SigPP. Second filter 1
- the cutoff frequency of 6 is set sufficiently lower than the cutoff frequency of the first filter 12.
- the output signal of the second filter 16 is the DC signal Sig2.
- the amplifier 18 is a variable gain amplifier, and amplifies the difference between the output of the peak hold circuit 14 and the output of the second filter 16.
- the gain g of the amplifier 18 is controlled by a control signal (not shown).
- the output signal of the amplifier 18 is output as the threshold voltage Vth.
- the comparator 30 compares the push-pull signal SigPP with the threshold voltage Vth output from the threshold voltage generation circuit 10, and determines the presence or absence of the land pre-pit signal SigLPP.
- FIG. 3 (a) shows the push-pull signal SigPP and the threshold voltage Vth in FIG. b) shows the wobble signal SigWBL, the peak signal Sigl, and the DC signal Sig2, and Fig. 3 (c) shows the land repeat signal SigLPP.
- a push-pull signal SigPP in which a wobble signal and a land prepit signal shown in FIG. 3A are superimposed is input to the input terminal 102 of the land prepit signal detection circuit 100.
- the push-pull signal SigPP is input to the first filter 12, the second filter 16, and the comparator 30.
- the first filter 12 removes the high-frequency component of the push-pull signal SigPP and removes the land pre-pit signal, thereby outputting the wobble signal SigWBL shown in Fig. 3 (b).
- the peak hold circuit 14 generates a peak signal Sigl by holding the peak value of the wobble signal SigWBL.
- the second filter 16 extracts the DC component of the push-pull signal SigPP and generates a DC signal Sig2.
- the amplifier 18 amplifies a difference ⁇ between the peak signal Sigl and the DC signal Sig2 by a gain g, and generates a threshold voltage Vth.
- the difference ⁇ between the peak signal Sigl and the DC signal Sig2 is nothing but the amplitude of the wobble signal SigWBL.
- the comparator 30 compares the push-pull signal SigPP with the voltage value of the threshold voltage Vth, and outputs a land pre-pit signal SigLPP that goes high when SigPP> Vth.
- the threshold voltage Vth changes following the change of the amplitude ⁇ of the wobble signal SigWBL.
- the pit signal SigLPP can be detected.
- the gain g of the amplifier 18 depends on the type of the pickup 204 provided in the preceding stage of the land pre-pit signal detection circuit 100, the type of media of the optical disc 210 to be read or written, or the rotational speed of the optical disc 210. It may be changed accordingly. As a result, the threshold voltage Vth for detecting the land prefix signal can be suitably adjusted according to the usage state of the optical disc apparatus 200.
- variable gain amplifier As the amplifier 18, but a fixed gain amplifier that performs amplification with a predetermined gain may be used. In this case, the circuit is simple You can do it.
- FIG. 4 is a circuit diagram showing a modification of the land pre-pit signal detection circuit 100 of FIG.
- the same or equivalent components as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.
- the threshold voltage generation circuit 10 in FIG. 4 further includes a voltage dividing circuit 20 that divides the output signal Sig3 of the amplifier 18 and the peak signal Sigl that is the output of the peak hold circuit 14, and the output signal of the voltage dividing circuit 20 Is output as the threshold voltage Vth.
- the voltage dividing circuit 20 may be configured using a known technique.
- FIG. 5 is an operation waveform diagram of the land pre-pit signal detection circuit 100 of FIG.
- the amplitude ⁇ of the wobble signal SigWBL is amplified by the amplifier 18 to generate the signal Sig3.
- the threshold voltage Vth is generated by dividing the output signal Sig3 of the amplifier 18 and the peak signal Sigl.
- the gain g of the amplifier 18 may be fixed, and the voltage dividing ratio of the voltage dividing circuit 20 may be adjustable.
- the threshold voltage Vth can be adjusted by controlling the voltage division ratio.
- the amplifier 18 may be a variable gain amplifier, and the voltage dividing ratio of the voltage dividing circuit 20 may be adjustable.
- the threshold voltage Vth can be adjusted by shifting to the high potential side or the low potential side by both the gain g and the voltage division ratio.
- the force described for the case where the land pre-pit signal detection circuit 100 is integrated and integrated in one LSI is not limited to this, and some components are discrete on the outside of the LSI. It may be provided as an element or a chip component, or may be constituted by a plurality of LSIs.
- the land pre-pit signal SigLPP force at the peak and the force described for the case where the push-pull signal SigP P appears are not limited to this. Suitable detection by inverting the logic value of the signal can do.
- the present invention can be used for a disk device.
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Optical Recording Or Reproduction (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007505897A JPWO2007007796A1 (ja) | 2005-07-14 | 2006-07-12 | ランドプリピット信号検出回路およびそれを用いた光ディスク装置ならびに電子機器 |
US11/995,607 US20090262639A1 (en) | 2005-07-14 | 2006-07-12 | Land prepit signal detecting circuit |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005205093 | 2005-07-14 | ||
JP2005-205093 | 2005-07-14 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2007007796A1 true WO2007007796A1 (ja) | 2007-01-18 |
WO2007007796A8 WO2007007796A8 (ja) | 2007-03-08 |
Family
ID=37637186
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/313880 WO2007007796A1 (ja) | 2005-07-14 | 2006-07-12 | ランドプリピット信号検出回路およびそれを用いた光ディスク装置ならびに電子機器 |
Country Status (6)
Country | Link |
---|---|
US (1) | US20090262639A1 (ja) |
JP (1) | JPWO2007007796A1 (ja) |
KR (1) | KR20080034087A (ja) |
CN (1) | CN101080768A (ja) |
TW (1) | TW200719320A (ja) |
WO (1) | WO2007007796A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101388223B (zh) * | 2007-09-13 | 2011-05-04 | 日立乐金资料储存股份有限公司 | 光盘装置 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108287251B (zh) * | 2017-12-07 | 2020-11-13 | 中国航空工业集团公司西安航空计算技术研究所 | 一种基于峰值保持的转速凹/凸齿信号识别方法 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003151211A (ja) * | 2001-11-15 | 2003-05-23 | Hitachi Ltd | ディジタル信号の記録装置、記録方法、記録再生装置及び記録再生方法 |
JP2004134002A (ja) * | 2002-10-10 | 2004-04-30 | Sony Corp | ディスクドライブ装置、プリピット検出方法 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3922424B2 (ja) * | 2000-07-25 | 2007-05-30 | パイオニア株式会社 | 光学式記録媒体、光学式記録媒体製造装置及び光学式記録媒体製造方法 |
JP2002237052A (ja) * | 2001-02-06 | 2002-08-23 | Pioneer Electronic Corp | 光記録媒体のプリピット検出装置 |
EP1477985A1 (en) * | 2003-05-14 | 2004-11-17 | Deutsche Thomson-Brandt Gmbh | Method and device for detecting land pre-pits |
-
2006
- 2006-07-12 WO PCT/JP2006/313880 patent/WO2007007796A1/ja active Application Filing
- 2006-07-12 US US11/995,607 patent/US20090262639A1/en not_active Abandoned
- 2006-07-12 CN CNA2006800013880A patent/CN101080768A/zh active Pending
- 2006-07-12 JP JP2007505897A patent/JPWO2007007796A1/ja active Pending
- 2006-07-12 KR KR1020077016406A patent/KR20080034087A/ko not_active Application Discontinuation
- 2006-07-14 TW TW095125864A patent/TW200719320A/zh unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003151211A (ja) * | 2001-11-15 | 2003-05-23 | Hitachi Ltd | ディジタル信号の記録装置、記録方法、記録再生装置及び記録再生方法 |
JP2004134002A (ja) * | 2002-10-10 | 2004-04-30 | Sony Corp | ディスクドライブ装置、プリピット検出方法 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101388223B (zh) * | 2007-09-13 | 2011-05-04 | 日立乐金资料储存股份有限公司 | 光盘装置 |
Also Published As
Publication number | Publication date |
---|---|
TW200719320A (en) | 2007-05-16 |
KR20080034087A (ko) | 2008-04-18 |
JPWO2007007796A1 (ja) | 2009-01-29 |
WO2007007796A8 (ja) | 2007-03-08 |
US20090262639A1 (en) | 2009-10-22 |
CN101080768A (zh) | 2007-11-28 |
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