DE3884998D1 - Optisches Aufnahmegerät. - Google Patents
Optisches Aufnahmegerät.Info
- Publication number
- DE3884998D1 DE3884998D1 DE88303146T DE3884998T DE3884998D1 DE 3884998 D1 DE3884998 D1 DE 3884998D1 DE 88303146 T DE88303146 T DE 88303146T DE 3884998 T DE3884998 T DE 3884998T DE 3884998 D1 DE3884998 D1 DE 3884998D1
- Authority
- DE
- Germany
- Prior art keywords
- recording device
- optical recording
- optical
- recording
- 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
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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/13—Optical detectors therefor
- G11B7/133—Shape of individual detector elements
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/094—Methods and circuits for servo offset compensation
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—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
- G11B7/0909—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 by astigmatic methods
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62125321A JP2887273B2 (ja) | 1987-05-22 | 1987-05-22 | 光学式ピックアップ装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
DE3884998D1 true DE3884998D1 (de) | 1993-11-25 |
DE3884998T2 DE3884998T2 (de) | 1994-04-28 |
Family
ID=14907219
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE88303146T Expired - Fee Related DE3884998T2 (de) | 1987-05-22 | 1988-04-08 | Optisches Aufnahmegerät. |
Country Status (4)
Country | Link |
---|---|
US (1) | US4914646A (de) |
EP (1) | EP0292107B1 (de) |
JP (1) | JP2887273B2 (de) |
DE (1) | DE3884998T2 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02201741A (ja) * | 1989-01-31 | 1990-08-09 | Toshiba Corp | フォーカス検出装置 |
JP3157873B2 (ja) * | 1991-11-15 | 2001-04-16 | パイオニア株式会社 | 光ピックアップ装置における焦点制御装置 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1603596A (en) * | 1977-06-06 | 1981-11-25 | Mca Disco Vision | Optical transducer and focusing system |
US4366377A (en) * | 1980-09-29 | 1982-12-28 | Mcdonnell Douglas Corporation | Dual sensitivity optical sensor |
DE3280137D1 (de) * | 1981-09-17 | 1990-04-19 | Toshiba Kawasaki Kk | Ein optischer kopf. |
JPS5856236A (ja) * | 1981-09-28 | 1983-04-02 | Hitachi Ltd | 光学的トラック位置検出装置およびそれを用いた光学的記録再生装置 |
JPS58208944A (ja) * | 1982-05-31 | 1983-12-05 | Sony Corp | 光学ヘツド制御信号発生装置 |
JPS59125727U (ja) * | 1983-02-15 | 1984-08-24 | パイオニア株式会社 | 光学式情報ピツクアツプ装置 |
US4684799A (en) * | 1983-09-19 | 1987-08-04 | Ricoh Company, Ltd. | Focus detection method involving cutting more than half of light beam reflected from disc |
JPS60138748A (ja) * | 1983-12-27 | 1985-07-23 | Toshiba Corp | 光学式情報再生装置 |
JPS60185230A (ja) * | 1984-03-02 | 1985-09-20 | Pioneer Electronic Corp | 焦点誤差検出装置 |
JPS6124037A (ja) * | 1984-07-13 | 1986-02-01 | Tokyo Electric Co Ltd | 光学ヘツド |
JPH07101517B2 (ja) * | 1985-03-19 | 1995-11-01 | 松下電器産業株式会社 | 光検出素子 |
US4816665A (en) * | 1987-08-06 | 1989-03-28 | Maxtor Corporation | Sensor array for focus detection |
-
1987
- 1987-05-22 JP JP62125321A patent/JP2887273B2/ja not_active Expired - Lifetime
-
1988
- 1988-04-05 US US07/177,734 patent/US4914646A/en not_active Expired - Lifetime
- 1988-04-08 DE DE88303146T patent/DE3884998T2/de not_active Expired - Fee Related
- 1988-04-08 EP EP88303146A patent/EP0292107B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0292107A2 (de) | 1988-11-23 |
US4914646A (en) | 1990-04-03 |
EP0292107A3 (en) | 1989-08-30 |
EP0292107B1 (de) | 1993-10-20 |
DE3884998T2 (de) | 1994-04-28 |
JP2887273B2 (ja) | 1999-04-26 |
JPS63291220A (ja) | 1988-11-29 |
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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 |