JPS649657B2 - - Google Patents
Info
- Publication number
- JPS649657B2 JPS649657B2 JP13561483A JP13561483A JPS649657B2 JP S649657 B2 JPS649657 B2 JP S649657B2 JP 13561483 A JP13561483 A JP 13561483A JP 13561483 A JP13561483 A JP 13561483A JP S649657 B2 JPS649657 B2 JP S649657B2
- Authority
- JP
- Japan
- Prior art keywords
- photodetector
- light
- information
- defocus
- information track
- 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
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
Landscapes
- Automatic Focus Adjustment (AREA)
- Optical Recording Or Reproduction (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13561483A JPS6028033A (ja) | 1983-07-25 | 1983-07-25 | 光学ヘツド装置の焦点ずれ検出装置 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13561483A JPS6028033A (ja) | 1983-07-25 | 1983-07-25 | 光学ヘツド装置の焦点ずれ検出装置 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6028033A JPS6028033A (ja) | 1985-02-13 |
| JPS649657B2 true JPS649657B2 (https=) | 1989-02-20 |
Family
ID=15155920
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13561483A Granted JPS6028033A (ja) | 1983-07-25 | 1983-07-25 | 光学ヘツド装置の焦点ずれ検出装置 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6028033A (https=) |
-
1983
- 1983-07-25 JP JP13561483A patent/JPS6028033A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6028033A (ja) | 1985-02-13 |
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