JPH034975B2 - - Google Patents

Info

Publication number
JPH034975B2
JPH034975B2 JP56031517A JP3151781A JPH034975B2 JP H034975 B2 JPH034975 B2 JP H034975B2 JP 56031517 A JP56031517 A JP 56031517A JP 3151781 A JP3151781 A JP 3151781A JP H034975 B2 JPH034975 B2 JP H034975B2
Authority
JP
Japan
Prior art keywords
beam splitter
light
polarization
polarizing beam
polarizing
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
JP56031517A
Other languages
English (en)
Japanese (ja)
Other versions
JPS57147148A (en
Inventor
Tsuneo Yanagida
Kiichi Kato
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.)
Olympus Corp
Original Assignee
Olympus Optical Co 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 Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP56031517A priority Critical patent/JPS57147148A/ja
Priority to US06/352,525 priority patent/US4451863A/en
Publication of JPS57147148A publication Critical patent/JPS57147148A/ja
Publication of JPH034975B2 publication Critical patent/JPH034975B2/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
    • G11B11/10541—Heads for reproducing
    • G11B11/10543—Heads for reproducing using optical beam of radiation
    • 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
    • G11B11/10502—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 characterised by the transducing operation to be executed
    • G11B11/10515—Reproducing
JP56031517A 1981-03-05 1981-03-05 Information reproducer with magnetooptic system Granted JPS57147148A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP56031517A JPS57147148A (en) 1981-03-05 1981-03-05 Information reproducer with magnetooptic system
US06/352,525 US4451863A (en) 1981-03-05 1982-02-26 Information reproducing apparatus based on opto-magnetic effect

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56031517A JPS57147148A (en) 1981-03-05 1981-03-05 Information reproducer with magnetooptic system

Publications (2)

Publication Number Publication Date
JPS57147148A JPS57147148A (en) 1982-09-10
JPH034975B2 true JPH034975B2 (enExample) 1991-01-24

Family

ID=12333386

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56031517A Granted JPS57147148A (en) 1981-03-05 1981-03-05 Information reproducer with magnetooptic system

Country Status (2)

Country Link
US (1) US4451863A (enExample)
JP (1) JPS57147148A (enExample)

Families Citing this family (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1190321A (en) * 1981-10-29 1985-07-09 Toshihisa Deguchi Magneto-optical head assembly
JPS58203646A (ja) * 1982-05-21 1983-11-28 Canon Inc 光磁気再生装置
JPS5936338A (ja) * 1982-08-24 1984-02-28 Matsushita Electric Ind Co Ltd 光デイスク記録再生方法
JPS5945646A (ja) * 1982-09-07 1984-03-14 Hitachi Ltd 光学的情報再生装置
US4660190A (en) * 1983-01-25 1987-04-21 Sharp Kabushiki Kaisha Optical focus position control in optical disc apparatus
JPS59157856A (ja) * 1983-02-25 1984-09-07 Sanyo Electric Co Ltd 光磁気情報記録装置に於ける再生構造
JPS59168951A (ja) * 1983-03-16 1984-09-22 Sanyo Electric Co Ltd 光磁気デイスク装置
JPS59168955A (ja) * 1983-03-17 1984-09-22 Sanyo Electric Co Ltd 光磁気情報記録装置に於ける再生構造
JPS59163943U (ja) * 1983-04-18 1984-11-02 パイオニア株式会社 光軸モニタ装置
US4658390A (en) * 1983-04-18 1987-04-14 Sharp Kabushiki Kaisha Optical focus position control in an optical memory system
JPS59203259A (ja) * 1983-05-04 1984-11-17 Sanyo Electric Co Ltd 光磁気デイスク装置
US4638470A (en) * 1984-05-09 1987-01-20 Xerox Corporation Apparatus using beam splitter cube with specific characteristics for reading information recorded in a magneto-optic medium
KR920007294B1 (ko) * 1984-06-29 1992-08-29 가부시끼가이샤 히다찌세이사꾸쇼 광자기 정보 기록장치의 광헤드
EP0205940B1 (de) * 1985-05-31 1989-08-30 Siemens Aktiengesellschaft Optisches System zum Führen des Lesestrahles bei einem magneto-optischen Speicher
JPH0746429B2 (ja) * 1985-06-21 1995-05-17 オリンパス光学工業株式会社 光学式記録再生装置
JPH0810854Y2 (ja) * 1986-05-12 1996-03-29 パイオニア株式会社 光磁気記録媒体再生装置
US5189651A (en) * 1986-05-12 1993-02-23 Pioneer Electronic Corporation Optical system in magneto-optical recording and reproducing device
JPS6318550A (ja) * 1986-07-10 1988-01-26 Brother Ind Ltd 光磁気デイスク用光学ヘツド
DE3732874A1 (de) * 1987-09-30 1989-04-20 Thomson Brandt Gmbh Optische abtastvorrichtung
US4774615A (en) * 1987-02-17 1988-09-27 Eastman Kodak Company Magneto-optic read-out method and apparatus with polarization correction means
IT1218657B (it) * 1987-05-21 1990-04-19 Olivetti & Co Spa Dispositivo di lettura di un supporto di registrazione di dati per effetto magneto-ottico su un raggio laser
JPH0777048B2 (ja) * 1987-06-26 1995-08-16 三菱電機株式会社 記録媒体駆動装置
US4823220A (en) * 1987-11-16 1989-04-18 International Business Machines Corporation Detector for magnetooptic recorders
CA1316597C (en) * 1988-07-20 1993-04-20 Takeshi Yamaguchi Magneto-optical memory apparatus and optical memory apparatus
US4989189A (en) * 1988-08-22 1991-01-29 Eastman Kodak Company Magneto-optic playback apparatus including astigmatic diffracting means
JPH02152015A (ja) * 1988-12-05 1990-06-12 Pioneer Electron Corp プリグルーブ付光ディスク及びこれを用いた記録方式
JPH0329138A (ja) * 1990-04-13 1991-02-07 Sanyo Electric Co Ltd 情報読取装置
DE69327369T2 (de) * 1992-02-07 2000-06-21 Sony Corp., Tokio/Tokyo Optisches abtastgerät für eine magneto-optische speicherung
US5504731A (en) * 1992-03-06 1996-04-02 Quantum Corporation Remote fine positioning mechanism
JPH06259790A (ja) * 1993-11-15 1994-09-16 Canon Inc 光ピックアップ装置
JPH09198733A (ja) * 1996-01-19 1997-07-31 Nec Corp 光ディスク用光ヘッド及びそれを用いた再生方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3396266A (en) * 1964-05-25 1968-08-06 Ibm Optical information read-out system
US3739362A (en) * 1971-03-25 1973-06-12 Magnavox Co Magneto-optical signal processor
NL160138C (nl) * 1972-05-11 1979-09-17 Philips Nv Inrichting voor het uitlezen van een vlakke registratie- drager.
FR2222665B1 (enExample) * 1973-03-21 1975-10-31 Thomson Brandt
US4125860A (en) * 1975-06-16 1978-11-14 Nippon Telegraph And Telephone Public Corporation Reproducer for an eraseable videodisc
WO1980001016A1 (fr) * 1978-11-01 1980-05-15 Hitachi Ltd Dispositif de detection d'anisotropie magneto-optique
JPS5766537A (en) * 1980-10-09 1982-04-22 Sharp Corp Magnetooptic recording and reproducing device

Also Published As

Publication number Publication date
JPS57147148A (en) 1982-09-10
US4451863A (en) 1984-05-29

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