JPH0146927B2 - - Google Patents
Info
- Publication number
- JPH0146927B2 JPH0146927B2 JP13801780A JP13801780A JPH0146927B2 JP H0146927 B2 JPH0146927 B2 JP H0146927B2 JP 13801780 A JP13801780 A JP 13801780A JP 13801780 A JP13801780 A JP 13801780A JP H0146927 B2 JPH0146927 B2 JP H0146927B2
- Authority
- JP
- Japan
- Prior art keywords
- lens
- light
- objective lens
- extraction
- displacement detection
- 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 28
- 238000000605 extraction Methods 0.000 claims description 22
- 239000004065 semiconductor Substances 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 13
- 238000006073 displacement reaction Methods 0.000 claims description 12
- 238000009792 diffusion process Methods 0.000 claims description 2
- 239000012780 transparent material Substances 0.000 claims description 2
- 239000000284 extract Substances 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002245 particle Substances 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)
- Optical Head (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13801780A JPS5764335A (en) | 1980-10-01 | 1980-10-01 | Optical information reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13801780A JPS5764335A (en) | 1980-10-01 | 1980-10-01 | Optical information reproducing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5764335A JPS5764335A (en) | 1982-04-19 |
| JPH0146927B2 true JPH0146927B2 (ko) | 1989-10-11 |
Family
ID=15212102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13801780A Granted JPS5764335A (en) | 1980-10-01 | 1980-10-01 | Optical information reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5764335A (ko) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS623217A (ja) * | 1985-06-28 | 1987-01-09 | Agency Of Ind Science & Technol | 焦点位置検出方式 |
-
1980
- 1980-10-01 JP JP13801780A patent/JPS5764335A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5764335A (en) | 1982-04-19 |
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