JPH075549Y2 - 光磁気ヘツドのフオ−カスエラ−検出装置 - Google Patents
光磁気ヘツドのフオ−カスエラ−検出装置Info
- Publication number
- JPH075549Y2 JPH075549Y2 JP1987049615U JP4961587U JPH075549Y2 JP H075549 Y2 JPH075549 Y2 JP H075549Y2 JP 1987049615 U JP1987049615 U JP 1987049615U JP 4961587 U JP4961587 U JP 4961587U JP H075549 Y2 JPH075549 Y2 JP H075549Y2
- Authority
- JP
- Japan
- Prior art keywords
- photodetector
- magneto
- linearly polarized
- focus error
- incident
- 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 - Lifetime
Links
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
Landscapes
- Optical Recording Or Reproduction (AREA)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1987049615U JPH075549Y2 (ja) | 1987-03-31 | 1987-03-31 | 光磁気ヘツドのフオ−カスエラ−検出装置 |
KR1019880003469A KR880011751A (ko) | 1987-03-31 | 1988-03-30 | 광자기 헤드의 촛점 에러 검출 장치 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1987049615U JPH075549Y2 (ja) | 1987-03-31 | 1987-03-31 | 光磁気ヘツドのフオ−カスエラ−検出装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS63157818U JPS63157818U (US07223432-20070529-C00017.png) | 1988-10-17 |
JPH075549Y2 true JPH075549Y2 (ja) | 1995-02-08 |
Family
ID=30872231
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1987049615U Expired - Lifetime JPH075549Y2 (ja) | 1987-03-31 | 1987-03-31 | 光磁気ヘツドのフオ−カスエラ−検出装置 |
Country Status (2)
Country | Link |
---|---|
JP (1) | JPH075549Y2 (US07223432-20070529-C00017.png) |
KR (1) | KR880011751A (US07223432-20070529-C00017.png) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2643586B2 (ja) * | 1990-11-09 | 1997-08-20 | 日本電気株式会社 | 光学式情報記録再生装置 |
JP2643595B2 (ja) * | 1990-11-29 | 1997-08-20 | 日本電気株式会社 | 光ヘッド装置 |
-
1987
- 1987-03-31 JP JP1987049615U patent/JPH075549Y2/ja not_active Expired - Lifetime
-
1988
- 1988-03-30 KR KR1019880003469A patent/KR880011751A/ko not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
JPS63157818U (US07223432-20070529-C00017.png) | 1988-10-17 |
KR880011751A (ko) | 1988-10-31 |
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