HK68795A - Automatic focussing control - Google Patents
Automatic focussing controlInfo
- Publication number
- HK68795A HK68795A HK68795A HK68795A HK68795A HK 68795 A HK68795 A HK 68795A HK 68795 A HK68795 A HK 68795A HK 68795 A HK68795 A HK 68795A HK 68795 A HK68795 A HK 68795A
- Authority
- HK
- Hong Kong
- Prior art keywords
- focussing
- recording medium
- control loop
- automatic focussing
- focussing control
- Prior art date
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
- G11B7/08—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
-
- 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
- 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
Landscapes
- Optical Recording Or Reproduction (AREA)
- Medicines Containing Material From Animals Or Micro-Organisms (AREA)
- Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
- Medicines Containing Plant Substances (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
- Looms (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
- Eye Examination Apparatus (AREA)
- Details Of Television Scanning (AREA)
- Telescopes (AREA)
- Focusing (AREA)
- Automatic Focus Adjustment (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3936032A DE3936032A1 (de) | 1989-10-28 | 1989-10-28 | Fokusregelkreis |
| PCT/EP1990/001603 WO1991006949A1 (de) | 1989-10-28 | 1990-09-21 | Fokusregelkreis |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| HK68795A true HK68795A (en) | 1995-05-12 |
Family
ID=6392483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| HK68795A HK68795A (en) | 1989-10-28 | 1995-05-04 | Automatic focussing control |
Country Status (14)
| Country | Link |
|---|---|
| EP (1) | EP0500547B1 (xx) |
| JP (1) | JP2930715B2 (xx) |
| KR (1) | KR100251289B1 (xx) |
| CN (1) | CN1022518C (xx) |
| AT (1) | ATE114381T1 (xx) |
| AU (1) | AU6405190A (xx) |
| DE (2) | DE3936032A1 (xx) |
| ES (1) | ES2064763T3 (xx) |
| FI (1) | FI921879A0 (xx) |
| HK (1) | HK68795A (xx) |
| HU (1) | HU208588B (xx) |
| MY (1) | MY107278A (xx) |
| TR (1) | TR24658A (xx) |
| WO (1) | WO1991006949A1 (xx) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5978329A (en) * | 1995-06-07 | 1999-11-02 | Discovision Associates | Technique for closed loop servo operation in optical disc tracking control |
| WO2002093568A1 (fr) * | 2001-05-11 | 2002-11-21 | Matsushita Electric Industrial Co., Ltd. | Tete optique, enregistreur-lecteur de disque, et procede de pilotage d'un objectif |
| DE102005018461A1 (de) | 2005-04-20 | 2006-10-26 | Deutsche Thomson-Brandt Gmbh | Fokusregelung für optischen Abtaster |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6070923U (ja) * | 1983-10-19 | 1985-05-20 | パイオニア株式会社 | 焦点誤差検出装置 |
| JPS61269241A (ja) * | 1985-05-24 | 1986-11-28 | Sony Corp | 光学ヘツド用焦点検出装置 |
-
1989
- 1989-10-28 DE DE3936032A patent/DE3936032A1/de not_active Withdrawn
-
1990
- 1990-09-21 WO PCT/EP1990/001603 patent/WO1991006949A1/de active IP Right Grant
- 1990-09-21 DE DE59007781T patent/DE59007781D1/de not_active Expired - Fee Related
- 1990-09-21 JP JP2512856A patent/JP2930715B2/ja not_active Expired - Fee Related
- 1990-09-21 EP EP90913816A patent/EP0500547B1/de not_active Expired - Lifetime
- 1990-09-21 ES ES90913816T patent/ES2064763T3/es not_active Expired - Lifetime
- 1990-09-21 KR KR1019920700988A patent/KR100251289B1/ko not_active IP Right Cessation
- 1990-09-21 AT AT90913816T patent/ATE114381T1/de active
- 1990-09-21 AU AU64051/90A patent/AU6405190A/en not_active Abandoned
- 1990-09-21 HU HU921300A patent/HU208588B/hu not_active IP Right Cessation
- 1990-10-23 MY MYPI90001852A patent/MY107278A/en unknown
- 1990-10-26 TR TR90/1013A patent/TR24658A/xx unknown
- 1990-10-27 CN CN90108670A patent/CN1022518C/zh not_active Expired - Fee Related
-
1992
- 1992-04-27 FI FI921879A patent/FI921879A0/fi not_active Application Discontinuation
-
1995
- 1995-05-04 HK HK68795A patent/HK68795A/xx not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| KR920704282A (ko) | 1992-12-19 |
| EP0500547A1 (de) | 1992-09-02 |
| JPH05501327A (ja) | 1993-03-11 |
| HU208588B (en) | 1993-11-29 |
| TR24658A (tr) | 1992-03-01 |
| HU9201300D0 (en) | 1992-07-28 |
| CN1051444A (zh) | 1991-05-15 |
| DE3936032A1 (de) | 1991-05-02 |
| AU6405190A (en) | 1991-05-31 |
| FI921879A (fi) | 1992-04-27 |
| DE59007781D1 (de) | 1995-01-05 |
| MY107278A (en) | 1995-10-31 |
| CN1022518C (zh) | 1993-10-20 |
| KR100251289B1 (ko) | 2000-04-15 |
| EP0500547B1 (de) | 1994-11-23 |
| FI921879A0 (fi) | 1992-04-27 |
| ATE114381T1 (de) | 1994-12-15 |
| ES2064763T3 (es) | 1995-02-01 |
| HUT60874A (en) | 1992-10-28 |
| WO1991006949A1 (de) | 1991-05-16 |
| JP2930715B2 (ja) | 1999-08-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PC | Patent ceased (i.e. patent has lapsed due to the failure to pay the renewal fee) |