JPH0373934B2 - - Google Patents
Info
- Publication number
- JPH0373934B2 JPH0373934B2 JP19605383A JP19605383A JPH0373934B2 JP H0373934 B2 JPH0373934 B2 JP H0373934B2 JP 19605383 A JP19605383 A JP 19605383A JP 19605383 A JP19605383 A JP 19605383A JP H0373934 B2 JPH0373934 B2 JP H0373934B2
- Authority
- JP
- Japan
- Prior art keywords
- objective lens
- signal
- output
- focus
- disk
- 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
- 230000003287 optical effect Effects 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 201000009310 astigmatism Diseases 0.000 description 5
- 238000013459 approach Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 101100225927 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) epl-1 gene Proteins 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007246 mechanism 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)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
- Optical Recording Or Reproduction (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19605383A JPS6089833A (ja) | 1983-10-21 | 1983-10-21 | 光学式デイスク再生装置 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19605383A JPS6089833A (ja) | 1983-10-21 | 1983-10-21 | 光学式デイスク再生装置 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6089833A JPS6089833A (ja) | 1985-05-20 |
| JPH0373934B2 true JPH0373934B2 (enExample) | 1991-11-25 |
Family
ID=16351408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19605383A Granted JPS6089833A (ja) | 1983-10-21 | 1983-10-21 | 光学式デイスク再生装置 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6089833A (enExample) |
-
1983
- 1983-10-21 JP JP19605383A patent/JPS6089833A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6089833A (ja) | 1985-05-20 |
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