JPH0556584B2 - - Google Patents

Info

Publication number
JPH0556584B2
JPH0556584B2 JP59211318A JP21131884A JPH0556584B2 JP H0556584 B2 JPH0556584 B2 JP H0556584B2 JP 59211318 A JP59211318 A JP 59211318A JP 21131884 A JP21131884 A JP 21131884A JP H0556584 B2 JPH0556584 B2 JP H0556584B2
Authority
JP
Japan
Prior art keywords
magneto
optical
lens
light
extinction ratio
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
JP59211318A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6190346A (ja
Inventor
Takeshi Kato
Masahiro Oshima
Atsushi Saito
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP59211318A priority Critical patent/JPS6190346A/ja
Priority to KR1019850004501A priority patent/KR920007294B1/ko
Priority to EP85108077A priority patent/EP0166460B1/en
Priority to DE8585108077T priority patent/DE3582366D1/de
Priority to US06/750,476 priority patent/US4672593A/en
Publication of JPS6190346A publication Critical patent/JPS6190346A/ja
Publication of JPH0556584B2 publication Critical patent/JPH0556584B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10532—Heads
JP59211318A 1984-06-29 1984-10-11 光磁気再生装置 Granted JPS6190346A (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP59211318A JPS6190346A (ja) 1984-10-11 1984-10-11 光磁気再生装置
KR1019850004501A KR920007294B1 (ko) 1984-06-29 1985-06-25 광자기 정보 기록장치의 광헤드
EP85108077A EP0166460B1 (en) 1984-06-29 1985-06-28 Optical head for magneto-optical memory
DE8585108077T DE3582366D1 (de) 1984-06-29 1985-06-28 Optischer kopf fuer magneto-optischen speicher.
US06/750,476 US4672593A (en) 1984-06-29 1985-07-01 Optical head with improved extinction ratio for magneto-optical memory

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59211318A JPS6190346A (ja) 1984-10-11 1984-10-11 光磁気再生装置

Publications (2)

Publication Number Publication Date
JPS6190346A JPS6190346A (ja) 1986-05-08
JPH0556584B2 true JPH0556584B2 (OSRAM) 1993-08-19

Family

ID=16603961

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59211318A Granted JPS6190346A (ja) 1984-06-29 1984-10-11 光磁気再生装置

Country Status (1)

Country Link
JP (1) JPS6190346A (OSRAM)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0278533U (OSRAM) * 1988-12-05 1990-06-15
JPH0530826U (ja) * 1991-09-30 1993-04-23 株式会社アドバンテスト ２個の偏光ビーム・スプリツタより成る偏光ビーム・スプリツタを具備する光方向性結合器
EP0579843B1 (en) * 1992-02-07 1999-12-22 Sony Corporation Optical pickup apparatus for magneto-optical storage
US5663940A (en) * 1993-11-19 1997-09-02 Sony Corporation Optical pickup apparatus including hologram element
KR970700356A (ko) * 1994-11-10 1997-01-08 이데이 노부유키 광 픽업 장치 및 광학 디스크 드라이브 장치(Optical pickup apparatus and optical disk drive apparatus)
US6108280A (en) * 1998-06-30 2000-08-22 Fujitsu Ltd. Optical information storage unit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5788540A (en) * 1980-11-21 1982-06-02 Olympus Optical Co Ltd Method and apparatus for information read-in of optical magnetic recording medium
JPS60226045A (ja) * 1984-04-24 1985-11-11 Nippon Kogaku Kk <Nikon> 光磁気デイスクメモリ再生装置

Also Published As

Publication number Publication date
JPS6190346A (ja) 1986-05-08

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Legal Events

Date Code Title Description
EXPY Cancellation because of completion of term