JPH0554179B2 - - Google Patents
Info
- Publication number
- JPH0554179B2 JPH0554179B2 JP58191280A JP19128083A JPH0554179B2 JP H0554179 B2 JPH0554179 B2 JP H0554179B2 JP 58191280 A JP58191280 A JP 58191280A JP 19128083 A JP19128083 A JP 19128083A JP H0554179 B2 JPH0554179 B2 JP H0554179B2
- Authority
- JP
- Japan
- Prior art keywords
- reflected light
- objective lens
- recording medium
- photodetector
- spot
- 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
- 230000003287 optical effect Effects 0.000 claims description 38
- 238000001514 detection method Methods 0.000 claims description 15
- 201000009310 astigmatism Diseases 0.000 claims description 8
- 239000000284 extract Substances 0.000 claims 1
- 230000004907 flux Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005236 sound signal Effects 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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/13—Optical detectors therefor
-
- 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
- G11B7/094—Methods and circuits for servo offset compensation
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Automatic Focus Adjustment (AREA)
- Optical Recording Or Reproduction (AREA)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58191280A JPS6083229A (ja) | 1983-10-13 | 1983-10-13 | 光デイスクヘツドの自動焦点調節装置 |
| EP19840110194 EP0137272B1 (en) | 1983-09-05 | 1984-08-28 | Automatic focusing device |
| DE8484110194T DE3484723D1 (de) | 1983-09-05 | 1984-08-28 | Automatisches fokussierungsverfahren. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58191280A JPS6083229A (ja) | 1983-10-13 | 1983-10-13 | 光デイスクヘツドの自動焦点調節装置 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6083229A JPS6083229A (ja) | 1985-05-11 |
| JPH0554179B2 true JPH0554179B2 (el) | 1993-08-11 |
Family
ID=16271927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58191280A Granted JPS6083229A (ja) | 1983-09-05 | 1983-10-13 | 光デイスクヘツドの自動焦点調節装置 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6083229A (el) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002157756A (ja) | 2000-11-15 | 2002-05-31 | Sharp Corp | 焦点位置ずれ検出方法および光ピックアップ装置 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50104539A (el) * | 1974-01-15 | 1975-08-18 | ||
| JPS5339123A (en) * | 1976-09-22 | 1978-04-10 | Canon Inc | Automatic winder of cameras |
-
1983
- 1983-10-13 JP JP58191280A patent/JPS6083229A/ja active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50104539A (el) * | 1974-01-15 | 1975-08-18 | ||
| JPS5339123A (en) * | 1976-09-22 | 1978-04-10 | Canon Inc | Automatic winder of cameras |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6083229A (ja) | 1985-05-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |