JPH0370860B2 - - Google Patents
Info
- Publication number
- JPH0370860B2 JPH0370860B2 JP12189682A JP12189682A JPH0370860B2 JP H0370860 B2 JPH0370860 B2 JP H0370860B2 JP 12189682 A JP12189682 A JP 12189682A JP 12189682 A JP12189682 A JP 12189682A JP H0370860 B2 JPH0370860 B2 JP H0370860B2
- Authority
- JP
- Japan
- Prior art keywords
- envelope
- output
- signal
- focus
- detection means
- 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
- 238000001514 detection method Methods 0.000 claims description 28
- 230000003287 optical effect Effects 0.000 claims description 11
- 230000007423 decrease Effects 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 7
- 239000004065 semiconductor Substances 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000001960 triggered effect 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
- G11B7/08—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 |
|---|---|---|---|
| JP12189682A JPS5911542A (ja) | 1982-07-12 | 1982-07-12 | 光学記録再生装置 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12189682A JPS5911542A (ja) | 1982-07-12 | 1982-07-12 | 光学記録再生装置 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5911542A JPS5911542A (ja) | 1984-01-21 |
| JPH0370860B2 true JPH0370860B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1991-11-11 |
Family
ID=14822584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12189682A Granted JPS5911542A (ja) | 1982-07-12 | 1982-07-12 | 光学記録再生装置 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5911542A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) |
-
1982
- 1982-07-12 JP JP12189682A patent/JPS5911542A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5911542A (ja) | 1984-01-21 |