JPH0480451B2 - - Google Patents
Info
- Publication number
- JPH0480451B2 JPH0480451B2 JP19530484A JP19530484A JPH0480451B2 JP H0480451 B2 JPH0480451 B2 JP H0480451B2 JP 19530484 A JP19530484 A JP 19530484A JP 19530484 A JP19530484 A JP 19530484A JP H0480451 B2 JPH0480451 B2 JP H0480451B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- focus
- focus search
- objective lens
- error signal
- 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 18
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 201000009310 astigmatism Diseases 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000000034 method Methods 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
-
- 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
- G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
- G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
- G11B7/08511—Methods for track change, selection or preliminary positioning by moving the head with focus pull-in only
Landscapes
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19530484A JPS6173245A (ja) | 1984-09-18 | 1984-09-18 | フオ−カスサ−チ回路 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19530484A JPS6173245A (ja) | 1984-09-18 | 1984-09-18 | フオ−カスサ−チ回路 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6173245A JPS6173245A (ja) | 1986-04-15 |
| JPH0480451B2 true JPH0480451B2 (enrdf_load_stackoverflow) | 1992-12-18 |
Family
ID=16338924
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19530484A Granted JPS6173245A (ja) | 1984-09-18 | 1984-09-18 | フオ−カスサ−チ回路 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6173245A (enrdf_load_stackoverflow) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040031391A (ko) * | 2002-10-05 | 2004-04-13 | 삼성전자주식회사 | 틸트 디스크 판별 장치 및 방법 |
-
1984
- 1984-09-18 JP JP19530484A patent/JPS6173245A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6173245A (ja) | 1986-04-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |