JPH0430647B2 - - Google Patents
Info
- Publication number
- JPH0430647B2 JPH0430647B2 JP26248084A JP26248084A JPH0430647B2 JP H0430647 B2 JPH0430647 B2 JP H0430647B2 JP 26248084 A JP26248084 A JP 26248084A JP 26248084 A JP26248084 A JP 26248084A JP H0430647 B2 JPH0430647 B2 JP H0430647B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- optical axis
- reflected light
- receiving element
- absorbing
- 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 |
|---|---|---|---|
| JP26248084A JPS61139938A (ja) | 1984-12-12 | 1984-12-12 | フオ−カス制御装置 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26248084A JPS61139938A (ja) | 1984-12-12 | 1984-12-12 | フオ−カス制御装置 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61139938A JPS61139938A (ja) | 1986-06-27 |
| JPH0430647B2 true JPH0430647B2 (en, 2012) | 1992-05-22 |
Family
ID=17376368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26248084A Granted JPS61139938A (ja) | 1984-12-12 | 1984-12-12 | フオ−カス制御装置 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61139938A (en, 2012) |
-
1984
- 1984-12-12 JP JP26248084A patent/JPS61139938A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61139938A (ja) | 1986-06-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |