WO2005096276A1 - 読取装置及びディスク劣化検出方法 - Google Patents
読取装置及びディスク劣化検出方法 Download PDFInfo
- Publication number
- WO2005096276A1 WO2005096276A1 PCT/JP2005/006051 JP2005006051W WO2005096276A1 WO 2005096276 A1 WO2005096276 A1 WO 2005096276A1 JP 2005006051 W JP2005006051 W JP 2005006051W WO 2005096276 A1 WO2005096276 A1 WO 2005096276A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- disk
- reading
- deterioration
- adjustment
- adjustment value
- Prior art date
Links
- 230000006866 deterioration Effects 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title abstract description 17
- 230000003287 optical effect Effects 0.000 claims abstract description 36
- 238000001514 detection method Methods 0.000 claims description 20
- 230000003321 amplification Effects 0.000 claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 230000001678 irradiating effect Effects 0.000 claims 2
- 230000008569 process Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000007726 management method Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- G11B20/1816—Testing
-
- 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
- G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
- G11B7/0037—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs
- G11B7/00375—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs arrangements for detection of physical defects, e.g. of recording layer
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
- G11B7/1263—Power control during transducing, e.g. by monitoring
-
- 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
- G11B2020/1869—Preventing ageing phenomena from causing data loss, e.g. by monitoring the age of record carriers or by recognising wear, and by copying information elsewhere when a record carrier becomes unreliable
-
- 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
Definitions
- the present invention relates to a reading device and a disk deterioration detection method.
- optical disk reading error is deterioration of the optical disk itself. For example, if a foreign substance such as sand, dust, dust or the like adheres to the surface of the optical disc or is scratched, a reading error occurs, and the optical disc cannot be reproduced.
- optical disks capable of recording data at a general level have become widespread. This optical disc records data using, for example, a dye recording layer whose structure changes when irradiated with a light beam. For this reason, deterioration of the dye recording layer occurs, and the deterioration is more likely to occur as compared with a read-only optical disk.
- Patent Document 1 discloses a recording / reproducing apparatus that detects a read error rate of an optical disk at predetermined unit time intervals and displays a disk state based on the detection result. By displaying the disk status in this way, even if the playback quality deteriorates, it is assumed that the user does not immediately determine that the playback device has failed or deteriorated in performance, but that the optical disk has the cause. It can encourage action.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2002-124045
- the problem to be solved by the present invention includes the above-mentioned problem as an example.
- the present invention made to solve the above-mentioned problem is directed to a reading unit that irradiates a disk with a light beam and reads the reflected light, and adjusts the reading unit according to the reading result of the reading unit.
- a reading device comprising: an adjustment unit that performs adjustment of the reading unit within the adjustment range of the adjustment unit, and detects deterioration of the disk based on the adjustment value of the reading unit.
- the reading device further comprises means.
- the present invention provides a reading device that irradiates a disk with a light beam and reads the reflected light, and an adjusting device that adjusts the reading device in accordance with the reading result of the reading device.
- a disk deterioration detection method characterized by detecting deterioration of the disk.
- FIG. 1 is a block diagram showing a configuration of a main part of a reading device according to an embodiment.
- FIG. 2 is a block diagram showing one embodiment of a read / playback apparatus that implements the disk deterioration detection method of the present invention.
- FIG. 3 is a flowchart showing a processing procedure in an automatic adjustment process of a CPU 7a constituting the reading / reproducing apparatus of FIG. 2.
- FIG. 4 is a flowchart showing a processing procedure in a reproduction start process of a CPU 7a constituting the reading / reproducing apparatus of FIG. 1.
- Reading unit (reading means)
- Adjustment unit (adjustment means)
- FIG. 1 is a block diagram illustrating a configuration of a main part of a reading device according to an embodiment.
- the reading device 10 includes a reading unit 13, an adjusting unit 14, a deterioration detecting unit 15, a recording unit 16, and a notifying unit 17.
- the reading unit 13 has an optical pickup that irradiates the disk 12 with a light beam, receives reflected light of the disk 12 and converts the reflected light into an electric signal, and the electric signal converted by the optical pickup converts the light from the disk 12 into an electric signal. Read the reflected light.
- the adjusting unit 14 adjusts the reading unit 13 according to the reading result of the reading unit 13.
- the adjustment performed by the reading unit 13 includes, for example, adjustment of the optical pickup such as focus adjustment and tracking adjustment of the optical pickup, adjustment of the light amount of the light beam, and adjustment of the amplification gain of the electric signal converted by the optical pickup.
- the deterioration detecting unit 15 detects the deterioration of the disk 12 based on the adjustment value of the reading unit 13.
- the recording unit 16 records the adjustment value history of the reading unit 13 by the adjustment unit 14.
- the above-described deterioration detection unit 15 detects deterioration of the disk 12 based on, for example, a deviation amount between the adjustment value of the reading unit 13 adjusted by the adjustment unit 14 and the reference adjustment value.
- the reference adjustment value may be determined in advance, or may be determined based on the adjustment value history recorded by the recording unit 16.
- the notifying unit 17 notifies that fact.
- the reading unit 13 can be adjusted within the adjustment range of the adjusting unit 14, that is, it is determined that the reading device including the adjusting unit 14 does not have a failure or performance degradation.
- the deterioration of the disk can be detected using the adjustment of the reading unit 13 usually performed at the time of reading.
- the adjustment unit 13 may adjust an optical pickup that irradiates the disk 12. In this way, it is possible to use the adjustment of the optical pickup that is normally performed during reading. Thus, the deterioration of the disk 12 can be detected.
- the optical pickup has an objective lens for condensing the light beam on the disk 12, and the adjusting unit 14 adjusts the position of the objective lens in the direction approaching and separating from the disk 12 as an adjustment value, and It may be adjusted to focus on the disc 12. By doing so, it is possible to detect the deterioration of the disk 12 using the focus adjustment of the light beam that is usually performed at the time of reading.
- the optical pickup has an objective lens for condensing the light beam on the disk 12, and the adjusting unit 14 adjusts the position of the objective lens in the radial direction of the disk 12 as an adjustment value so that the light beam It may be adjusted so that it can follow the top. In this way, it is possible to detect the deterioration of the disk 12 using the tracking adjustment of the light beam that is usually performed at the time of reading.
- the adjustment unit 14 may adjust the reflected light of the light beam to be constant, using the light amount of the irradiated light beam as an adjustment value. In this way, it is possible to detect the deterioration of the disk 12 using the light amount adjustment of the light beam that is usually performed during reading.
- the adjustment unit 14 may perform adjustment using the amplification gain of the electric signal as an adjustment value. In this manner, the deterioration of the disk 12 can be detected by using the adjustment of the amplification gain of the electric signal which is usually performed at the time of reading.
- the deterioration detection unit 15 stores the adjustment value of the reading unit 13 and the adjustment value history recorded in the recording unit 16. The deterioration of the disk 12 may be detected based on the comparison.
- the adjustment history that is, the change of the adjustment value due to the contamination or deterioration of the reading device can be grasped from the past adjustment value, and thus the adjustment value history and the current adjustment value are compared.
- the adjustment value history and the current adjustment value are compared.
- the deterioration detection unit 15 may not detect the deterioration of the disk 12 until an adjustment value history equal to or more than a predetermined amount is recorded. By doing so, the deterioration of the disk 12 is not detected without the adjustment value history being recorded more than a predetermined amount. Thus, the deterioration of the disk 12 can be detected more accurately.
- the deterioration detection unit 15 determines a reference adjustment value based on the adjustment value history, and detects the deterioration of the disk 12 based on the amount of deviation between the reference adjustment value and the adjustment value of the reading unit 13. You may. This makes it possible to easily detect the deterioration of the disk 12 based on the amount of deviation from the reference adjustment value.
- the notifying unit 17 may notify that fact. In this way, by reporting the deterioration of the disk 12, the user can recognize that the disk 12 has deteriorated due to the environment inside the vehicle or due to scratches, and the disk 12 cannot be read. Evacuation actions such as backing up the disk 12 against the server.
- FIG. 2 is a block diagram showing an embodiment of a read / playback apparatus that implements the disk deterioration method of the present invention.
- the disk 1 is loaded so as to be driven to rotate by a spindle motor 2.
- the optical pickup 3 detects an optical system such as a laser diode for generating a light beam, an objective lens for condensing the light beam on the disk 1, and the reflected light of the light beam, and detects an RF corresponding to the reflected light.
- a light detection unit for outputting a signal and the like are mounted (none is shown).
- the optical pickup 3 is equipped with a tracking actuator that displaces the above-described objective lens in the radial direction of the disk 1 and a focusing actuator that displaces the object lens in the direction toward and away from the disk 1. (Not shown).
- the RF signal output from the light detection unit in the optical pickup 3 is supplied to the RF amplifier 4.
- the RF amplifier 4 After amplifying the supplied RF signal, the RF amplifier 4 generates a reproduced RF signal, a focus error signal, a tracking error signal, and the like from the RF signal, and generates a servo signal processing circuit (hereinafter simply referred to as a servo DSP).
- Supply 5 Further, the above-described RF amplifier 4 functions as an adjusting means, and performs gain adjustment so that the level of the RF signal output from the optical pickup 3 is constant using the amplification gain of the RF signal as an adjustment value.
- the servo DSP 5 described above functions as an adjusting means, and uses the position of the objective lens in the direction approaching and separating from the disk 1 as an adjustment value, based on the focus error signal output from the RF amplifier 4, and the light beam from the optical pickup 3. Outputs a focus control signal that focuses on disk 1, and adjusts the focus. Then, the driver 6 drives the objective lens of the optical pickup 3 according to the supplied force control signal.
- the servo DSP 5 described above uses the position of the objective lens in the radial direction of the disk 1 as an adjustment value, and based on the tracking error signal output from the RF amplifier 4, the light beam from the optical pickup 3 A tracking control signal is output so that the track can be followed, and the tracking is adjusted. Then, the driver 6 drives the objective lens of the optical pickup 3 according to the supplied tracking control signal.
- the servo DSP 5 also generates a rotation control signal for controlling the rotation of the optical disc 1 based on the reproduced RF signal, and supplies the rotation control signal to the driver 6. Then, the driver 6 drives the spindle motor 2 in accordance with the supplied rotation control signal, whereby the disk 1 can be rotated at a desired speed.
- ⁇ COM microcomputer
- / z COM7 is a central processing unit (hereafter, CPU) 7a that performs various processes according to programs
- ROM7b is a read-only memory that stores the programs for the processes performed by the CPU7a, and a work area used in the processing of the CPU7a.
- It also has a built-in RAM 7c, which is a readable and writable memory having a data storage area for storing various data.
- the above-mentioned ⁇ COM7 has a display device 8 (for displaying various error information and the like).
- the reproduced RF signal from the RF amplifier 4 is supplied to a read / reproduce signal processing circuit (hereinafter referred to as a read / reproduce DSP) 9, which reads and reproduces the data written on the disc 1. Is performed.
- a read / reproduce DSP read / reproduce signal processing circuit
- the above-described optical pickup 3, RF amplifier 4, and read / reproduce DSP 9 correspond to the reading means in the claims and the reading unit 13 in the embodiment.
- the RF amplifier 4 and the servo DSP 5 correspond to the adjusting means in the claims and the adjusting unit 14 in the embodiment.
- the CPU 7a controls the servo DSP 5 and the reading / reproducing DSP 9 to read the management information written on the inner periphery of the disk 1. Further, the CPU 7a performs an automatic adjustment process and a reproduction start process in parallel with the reading of the management information.
- the CPU 7a controls the servo DSP 5 and the RF amplifier 4 to perform the above-described focus adjustment, tracking adjustment, and gain adjustment (step S1). Sl).
- the servo DSP 5 performs focus adjustment and tracking adjustment
- the RF amplifier 4 performs gain adjustment.
- the CPU 7a sequentially determines whether or not the focus adjustment, the tracking adjustment, and the gain adjustment are normally performed within the respective adjustment ranges (Steps S2, S3, and S4). If the focus adjustment is not performed normally (N in step S2), the CPU 7a displays “focus error” on the display device 8 (step S6), and ends the process.
- step S3 the CPU 7a displays “tracking error” on the display device 8 (step S7), and ends the process. Further, when the gain adjustment is not performed normally (N in step S4), the CPU 7a displays “gain error” on the display device 8 (step S8), and ends the process. On the other hand, when the focus adjustment, the tracking adjustment, and the gain adjustment are all performed normally (Y in step S4), the CPU 7a turns on the adjustment end flag F1 (step S5), and ends the processing.
- step S11 the CPU 7a functions as a recording unit, and records the adjustment values obtained by the current focus adjustment, tracking adjustment, and gain adjustment as an adjustment value history in a history area formed in the RAM 7c.
- the CPU 7a and the RAM 7c correspond to the recording unit in the claims and the recording unit 16 in the embodiment.
- the CPU 7a waits until an adjustment value history equal to or more than a predetermined amount is recorded in the history area (Y in step S12), and performs deterioration detection processing ( Step SI 3).
- the CPU 7a functions as deterioration detection means, and adjusts the focus standard value, the tracking standard value, and the gain standard value of the focus adjustment, tracking adjustment, and gain adjustment performed in the current automatic adjustment process.
- the amount of deviation from the value exceeds the threshold, the deterioration of the disk is detected.
- the focus standard value, tracking standard value, and gain standard value described above are determined based on past adjustment value histories recorded in the history area, and are, for example, average values of past adjustment histories and updated periodically. It is assumed that As is apparent from this, the CPU 7a corresponds to the deterioration detecting means in the claims and the deterioration detecting unit 15 in the embodiment.
- step S14 When no deterioration is detected by the above-described deterioration detection processing (N in step S14), the CPU 7a immediately starts the reading / reproducing operation of the disk 1 (step S16) and ends the processing. On the other hand, when the deterioration is detected (Y in step S14), the CPU 7a causes the display device 8 to display “disk degraded” (step S15), and then proceeds to step S16.
- the focus adjustment, the tracking adjustment, and the gain adjustment can be normally performed within the adjustment range, that is, when it is determined that there is no failure of the reading / reproducing apparatus and no deterioration in performance. Then, the deterioration of the disk 1 is detected based on the adjustment value. As a result, it is possible to accurately detect the deterioration of the disk 1 without erroneously detecting the failure of the reading / reproducing device or the deterioration of the performance as the deterioration of the disk 1. In addition, the deterioration of the disk can be detected using the focus adjustment, tracking adjustment, and gain adjustment normally performed during reading. Therefore, it is possible to detect the deterioration of the disk 1 at low cost without having to add a new configuration to detect the deterioration of the disk 1.
- the deterioration of the disk 1 is detected based on the amount of deviation between the current adjustment value and the standard value determined based on the past adjustment history.
- the standard value By setting based on the past history, the standard value fluctuates according to the dirt or deterioration of the read / playback device.
- the deterioration of the disk can be accurately detected.
- deterioration is not detected in a state where the adjustment value history is not recorded for a predetermined amount or more, so that deterioration of the disk 1 can be detected more accurately. .
- the gain of the RF amplifier 4 is adjusted in order to keep the level of the RF signal constant.
- the reading / reproducing apparatus adjusts the light amount so as to keep the level of the RF signal constant by using the light beam amount from the optical pickup 3 as an adjustment value, based on the adjustment value of the light amount.
- the deterioration of the disk may be detected.
- the deterioration of the disk is detected based on the adjustment values by the focus adjustment, the tracking adjustment, and the gain adjustment.
- the adjustment value is not limited to the above-described embodiment as long as the adjustment value fluctuates according to the deterioration of the disk 1.
- the deterioration of the disk 1 is detected when the amount of deviation from the standard value determined by the adjustment history of the current adjustment value is equal to or larger than the threshold.
- the present invention is not limited to the above-described embodiment, for example, as long as it is possible to determine that the current adjustment value has greatly changed in the past adjustment history power without calculating the standard value.
- one threshold value to be compared with the shift amount is set.
- the degree of deterioration of the disk for example, May be displayed on the display device.
- the deterioration of the disk 1 is detected by using the automatic adjustment performed when reading the management information before the reproduction of the data recorded on the disk 1 is started. I was However, for example, if automatic adjustment is performed even during data reading / reproducing, the deterioration of the disk 1 may be detected based on the adjustment value at this time.
- the standard value is determined based on the adjustment value history.
- the adjustment value history cannot be recorded, the deterioration of the disk is detected using the predetermined standard value. You may put out.
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/594,624 US20070133376A1 (en) | 2004-03-31 | 2005-03-30 | Read apparatus and a method of detecting deterioration of a disk |
JP2006511717A JPWO2005096276A1 (ja) | 2004-03-31 | 2005-03-30 | 読取装置及びディスク劣化検出方法 |
EP05727487A EP1736969A4 (en) | 2004-03-31 | 2005-03-30 | READER AND DATA CARRIER EXPRESSION DETECTION METHOD |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-103430 | 2004-03-31 | ||
JP2004103430 | 2004-03-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005096276A1 true WO2005096276A1 (ja) | 2005-10-13 |
Family
ID=35064020
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/006051 WO2005096276A1 (ja) | 2004-03-31 | 2005-03-30 | 読取装置及びディスク劣化検出方法 |
Country Status (4)
Country | Link |
---|---|
US (1) | US20070133376A1 (ja) |
EP (1) | EP1736969A4 (ja) |
JP (1) | JPWO2005096276A1 (ja) |
WO (1) | WO2005096276A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008053434A2 (en) * | 2006-10-31 | 2008-05-08 | Koninklijke Philips Electronics N.V. | Optical disc deterioration detection method |
JP2008305482A (ja) * | 2007-06-07 | 2008-12-18 | Alpine Electronics Inc | 記憶媒体再生装置および自動調整情報記憶方法 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8773962B2 (en) * | 2011-10-06 | 2014-07-08 | Panasonic Corporation | Information recording and reproducing device and method for determining deterioration of information recorded in a recording medium |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07130106A (ja) * | 1993-10-30 | 1995-05-19 | Nec Corp | 書換え型光記録再生装置 |
JPH11353682A (ja) * | 1998-06-05 | 1999-12-24 | Nec Eng Ltd | 光ディスク装置 |
JP2004206766A (ja) * | 2002-12-24 | 2004-07-22 | Alpine Electronics Inc | データ再生装置および不良検出方法 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3497033B2 (ja) * | 1995-12-22 | 2004-02-16 | パイオニア株式会社 | 光ディスクプレーヤの自動利得調整装置 |
JP2000311373A (ja) * | 1999-04-28 | 2000-11-07 | Sony Corp | ディスクドライブ装置 |
KR100689721B1 (ko) * | 1999-07-15 | 2007-03-08 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | 결함을 찾기 위하여 기록 디스크를 주사하는 방법 및디스크형 기록매체에 정보를 기록하는 기록장치 |
JP4523749B2 (ja) * | 2000-01-13 | 2010-08-11 | パナソニック株式会社 | 光ディスク記録再生装置 |
JP3768142B2 (ja) * | 2001-10-24 | 2006-04-19 | 松下電器産業株式会社 | ドロップアウト検出回路及び光ディスク装置 |
JP3931774B2 (ja) * | 2002-09-20 | 2007-06-20 | 松下電器産業株式会社 | 欠陥検出装置 |
WO2004047087A1 (ja) * | 2002-11-15 | 2004-06-03 | Pioneer Corporation | 汚れ検出装置及び方法並びに光学式情報再生装置 |
-
2005
- 2005-03-30 EP EP05727487A patent/EP1736969A4/en not_active Withdrawn
- 2005-03-30 WO PCT/JP2005/006051 patent/WO2005096276A1/ja active Application Filing
- 2005-03-30 US US10/594,624 patent/US20070133376A1/en not_active Abandoned
- 2005-03-30 JP JP2006511717A patent/JPWO2005096276A1/ja active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07130106A (ja) * | 1993-10-30 | 1995-05-19 | Nec Corp | 書換え型光記録再生装置 |
JPH11353682A (ja) * | 1998-06-05 | 1999-12-24 | Nec Eng Ltd | 光ディスク装置 |
JP2004206766A (ja) * | 2002-12-24 | 2004-07-22 | Alpine Electronics Inc | データ再生装置および不良検出方法 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1736969A4 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008053434A2 (en) * | 2006-10-31 | 2008-05-08 | Koninklijke Philips Electronics N.V. | Optical disc deterioration detection method |
WO2008053434A3 (en) * | 2006-10-31 | 2008-06-26 | Koninkl Philips Electronics Nv | Optical disc deterioration detection method |
JP2008305482A (ja) * | 2007-06-07 | 2008-12-18 | Alpine Electronics Inc | 記憶媒体再生装置および自動調整情報記憶方法 |
Also Published As
Publication number | Publication date |
---|---|
US20070133376A1 (en) | 2007-06-14 |
JPWO2005096276A1 (ja) | 2008-02-21 |
EP1736969A1 (en) | 2006-12-27 |
EP1736969A4 (en) | 2009-02-04 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4583328B2 (ja) | 光ディスク装置および光ディスク判別方法 | |
US8264921B2 (en) | Optical disc recording device | |
WO2005096276A1 (ja) | 読取装置及びディスク劣化検出方法 | |
US20100054094A1 (en) | Optical Disc Drive | |
US6999387B2 (en) | Disk reproducing apparatus and disk type identifying method | |
US20050201253A1 (en) | Optical reproducing apparatus and method with automatic gain control | |
US7599260B2 (en) | Optical disk recording/reproducing apparatus and method for determining optimal reproducing speed thereof | |
CN100407297C (zh) | 对空白盘片进行伺服控制的方法 | |
US20100195470A1 (en) | Optical Disk Recording/Reproducing Apparatus And Alternation Process Method Thereof | |
US20080013417A1 (en) | Method and apparatus of adjusting focusing servo in optical disc device | |
JP2005251240A (ja) | 光学的記録再生装置 | |
JP4099383B2 (ja) | データ再生装置および不良検出方法 | |
US20030128638A1 (en) | Optical disk device and gain control method used therefor | |
JP3802368B2 (ja) | ディスク記録再生装置 | |
JP2005063491A (ja) | 光ディスク装置 | |
JP3844248B2 (ja) | 光ディスク装置 | |
JP2007234183A (ja) | 光ディスク装置 | |
JP2008123615A (ja) | 情報記録再生装置 | |
US20070070844A1 (en) | Optical disk apparatus and a method for controlling overwrite operation thereof | |
KR20080109406A (ko) | 광디스크 장치의 보정 방법 | |
JP2005190563A (ja) | 光ディスク記録再生装置、光ディスク記録再生方法、プログラム | |
JP2005004873A (ja) | 光ディスク記録再生装置のチルト制御方法 | |
JP2008310870A (ja) | 光ディスク装置 | |
JP2004362672A (ja) | 光ディスク再生装置のチルト制御方法 | |
JP2006040487A (ja) | 光ディスクドライブ装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2006511717 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2007133376 Country of ref document: US Ref document number: 10594624 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWW | Wipo information: withdrawn in national office |
Country of ref document: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2005727487 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 2005727487 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 10594624 Country of ref document: US |