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
Application number
JP1987049615U
Other languages
English (en)
Japanese (ja)
Other versions
JPS63157818U (US20020128544A1-20020912-P00008.png
Inventor
敦 福本
潔 大里
美智雄 岡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Corp
Original Assignee
Sony Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sony Corp filed Critical Sony Corp
Priority to JP1987049615U priority Critical patent/JPH075549Y2/ja
Priority to KR1019880003469A priority patent/KR880011751A/ko
Publication of JPS63157818U publication Critical patent/JPS63157818U/ja
Application granted granted Critical
Publication of JPH075549Y2 publication Critical patent/JPH075549Y2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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)
JP1987049615U 1987-03-31 1987-03-31 光磁気ヘツドのフオ−カスエラ−検出装置 Expired - Lifetime JPH075549Y2 (ja)

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 (US20020128544A1-20020912-P00008.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 (US20020128544A1-20020912-P00008.png)
KR (1) KR880011751A (US20020128544A1-20020912-P00008.png)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
JPS63157818U (US20020128544A1-20020912-P00008.png) 1988-10-17
KR880011751A (ko) 1988-10-31

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