DE69621781T2 - Gerät zur wiedergabe eines optisch lesbaren aufzeichnungsträgers - Google Patents
Gerät zur wiedergabe eines optisch lesbaren aufzeichnungsträgersInfo
- Publication number
- DE69621781T2 DE69621781T2 DE69621781T DE69621781T DE69621781T2 DE 69621781 T2 DE69621781 T2 DE 69621781T2 DE 69621781 T DE69621781 T DE 69621781T DE 69621781 T DE69621781 T DE 69621781T DE 69621781 T2 DE69621781 T2 DE 69621781T2
- Authority
- DE
- Germany
- Prior art keywords
- focus error
- error signal
- signal
- information
- electronic circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000005855 radiation Effects 0.000 claims description 35
- 238000001914 filtration Methods 0.000 claims description 4
- 238000011896 sensitive detection Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 16
- 238000010606 normalization Methods 0.000 description 14
- 230000003287 optical effect Effects 0.000 description 9
- 239000000758 substrate Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 230000004075 alteration Effects 0.000 description 3
- 238000002310 reflectometry Methods 0.000 description 3
- 238000000691 measurement method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 201000009310 astigmatism Diseases 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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
- G11B7/08—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
- G11B7/0941—Methods and circuits for servo gain or phase compensation during operation
-
- 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
- G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
- G11B7/0916—Foucault or knife-edge methods
-
- 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
- G11B7/0943—Methods and circuits for performing mathematical operations on individual detector segment outputs
-
- 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
- G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
- G11B2007/0006—Recording, reproducing or erasing systems characterised by the structure or type of the carrier adapted for scanning different types of carrier, e.g. CD & DVD
-
- 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
- G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
- G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
- G11B2007/0013—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete layers
Landscapes
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP95203642 | 1995-12-27 | ||
| PCT/IB1996/001361 WO1997024718A1 (en) | 1995-12-27 | 1996-12-05 | Apparatus for scanning an optically readable record carrier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE69621781D1 DE69621781D1 (de) | 2002-07-18 |
| DE69621781T2 true DE69621781T2 (de) | 2003-03-13 |
Family
ID=8221016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE69621781T Expired - Fee Related DE69621781T2 (de) | 1995-12-27 | 1996-12-05 | Gerät zur wiedergabe eines optisch lesbaren aufzeichnungsträgers |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5841746A (https=) |
| EP (1) | EP0812458B1 (https=) |
| JP (1) | JPH11501445A (https=) |
| DE (1) | DE69621781T2 (https=) |
| TW (1) | TW318233B (https=) |
| WO (1) | WO1997024718A1 (https=) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19743935A1 (de) | 1997-10-04 | 1999-04-08 | Thomson Brandt Gmbh | Gerät zum Lesen oder Beschreiben optischer Aufzeichnungsträger |
| WO1999024974A2 (en) * | 1997-11-07 | 1999-05-20 | Koninklijke Philips Electronics N.V. | Optical scanning device |
| JP3605279B2 (ja) * | 1998-02-25 | 2004-12-22 | パイオニア株式会社 | 光学式ピックアップ |
| JP2008192191A (ja) * | 2007-01-31 | 2008-08-21 | Toshiba Corp | 信号処理方法及び光ディスク装置 |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4733065A (en) * | 1984-06-27 | 1988-03-22 | Canon Kabushiki Kaisha | Optical head device with diffraction grating for separating a light beam incident on an optical recording medium from a light beam reflected therefrom |
| US4933924A (en) * | 1987-07-03 | 1990-06-12 | Seiko Epson Corporation | Optical head and magneto-optical read/write device |
| JP3028854B2 (ja) * | 1990-07-18 | 2000-04-04 | セイコーエプソン株式会社 | 光ヘッド及び光記憶再生装置 |
| JPH06111344A (ja) * | 1992-09-30 | 1994-04-22 | Pioneer Electron Corp | 光ピックアップ装置 |
| JPH07311970A (ja) * | 1994-05-17 | 1995-11-28 | Seiko Epson Corp | 光ヘッド及び光記憶装置 |
| TW363182B (en) * | 1995-02-09 | 1999-07-01 | Hitachi Ltd | Positioning apparatus for optical disks |
-
1996
- 1996-12-05 EP EP96939243A patent/EP0812458B1/en not_active Expired - Lifetime
- 1996-12-05 DE DE69621781T patent/DE69621781T2/de not_active Expired - Fee Related
- 1996-12-05 WO PCT/IB1996/001361 patent/WO1997024718A1/en not_active Ceased
- 1996-12-05 JP JP9524130A patent/JPH11501445A/ja active Pending
- 1996-12-13 US US08/764,189 patent/US5841746A/en not_active Expired - Fee Related
- 1996-12-20 TW TW085115748A patent/TW318233B/zh active
Also Published As
| Publication number | Publication date |
|---|---|
| EP0812458B1 (en) | 2002-06-12 |
| TW318233B (https=) | 1997-10-21 |
| US5841746A (en) | 1998-11-24 |
| DE69621781D1 (de) | 2002-07-18 |
| EP0812458A1 (en) | 1997-12-17 |
| WO1997024718A1 (en) | 1997-07-10 |
| JPH11501445A (ja) | 1999-02-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8364 | No opposition during term of opposition | ||
| 8320 | Willingness to grant licences declared (paragraph 23) | ||
| 8339 | Ceased/non-payment of the annual fee |