JPS627610B2 - - Google Patents
Info
- Publication number
- JPS627610B2 JPS627610B2 JP9685981A JP9685981A JPS627610B2 JP S627610 B2 JPS627610 B2 JP S627610B2 JP 9685981 A JP9685981 A JP 9685981A JP 9685981 A JP9685981 A JP 9685981A JP S627610 B2 JPS627610 B2 JP S627610B2
- Authority
- JP
- Japan
- Prior art keywords
- shielding plate
- focus
- information
- laser beam
- sensor
- 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 33
- 238000001514 detection method Methods 0.000 claims description 25
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 230000004907 flux Effects 0.000 description 11
- 230000007423 decrease Effects 0.000 description 6
- 238000000926 separation method Methods 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035939 shock 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 |
|---|---|---|---|
| JP9685981A JPS57212631A (en) | 1981-06-23 | 1981-06-23 | Focus detector of optical information reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9685981A JPS57212631A (en) | 1981-06-23 | 1981-06-23 | Focus detector of optical information reproducing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57212631A JPS57212631A (en) | 1982-12-27 |
| JPS627610B2 true JPS627610B2 (US06534493-20030318-C00184.png) | 1987-02-18 |
Family
ID=14176187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9685981A Granted JPS57212631A (en) | 1981-06-23 | 1981-06-23 | Focus detector of optical information reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57212631A (US06534493-20030318-C00184.png) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05258234A (ja) * | 1992-03-09 | 1993-10-08 | Alps Electric Co Ltd | 複合磁気ヘッド |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR910020666A (ko) * | 1990-05-31 | 1991-12-20 | 정용문 | 광학식 디스크드라이브의 포커싱 에러(focusing error) 검출장치 |
-
1981
- 1981-06-23 JP JP9685981A patent/JPS57212631A/ja active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05258234A (ja) * | 1992-03-09 | 1993-10-08 | Alps Electric Co Ltd | 複合磁気ヘッド |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57212631A (en) | 1982-12-27 |
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