KR890005678A - 광학스캐닝장치 - Google Patents

광학스캐닝장치 Download PDF

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KR890005678A
KR890005678A KR1019880012602A KR880012602A KR890005678A KR 890005678 A KR890005678 A KR 890005678A KR 1019880012602 A KR1019880012602 A KR 1019880012602A KR 880012602 A KR880012602 A KR 880012602A KR 890005678 A KR890005678 A KR 890005678A
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recording medium
photodetector
light
lens
output
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KR1019880012602A
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KR970007168B1 (ko
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모리모또 야수아끼
뷔흘러 크리스챤
추커 프리트헬름
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롤프-디이터 베르거
도이체 톰손-브란트 게엠베하
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    • 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
    • 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
    • G11B7/1263—Power control during transducing, e.g. by monitoring
    • 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
    • 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
    • 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
    • G11B11/1055—Disposition or mounting of transducers relative to record carriers
    • G11B11/10576—Disposition or mounting of transducers relative to record carriers with provision for moving the transducers for maintaining alignment or spacing relative to the carrier
    • 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
    • G11B11/10595—Control of operating function
    • 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
    • G11B11/10595—Control of operating function
    • G11B11/10597—Adaptations for transducing various formats on the same or different carriers
    • 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B13/00—Recording simultaneously or selectively by methods covered by different main groups among G11B3/00, G11B5/00, G11B7/00 and G11B9/00; Record carriers therefor not otherwise provided for; Reproducing therefrom not otherwise provided for
    • G11B13/04—Recording simultaneously or selectively by methods covered by different main groups among G11B3/00, G11B5/00, G11B7/00 and G11B9/00; Record carriers therefor not otherwise provided for; Reproducing therefrom not otherwise provided for magnetically or by magnetisation and optically or by radiation, for changing or sensing optical properties

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Optical Head (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Wire Bonding (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Optical Communication System (AREA)

Abstract

내용 없음

Description

광학스캐닝장치
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제1도는, 백터 다이어그램.
제2도는 본 발명의 제 1 실시예도.
제3도는 본 발명의 제 2 실시예도.

Claims (4)

  1. 광원(1)은 빛을 기록매체(5)로 방출하고,기록매체(5)에 의해 반사되는 또는 기록매체를 투과하는 빛은 그 편파방향에 따라 제 1 광검출기(11,28)또는 제 2 광검출기(17,29)로 조사되며 자기 광학기록매체(5)를 판독 및/또는 기록하는 광학스캐닝장치에 있어서, 기록매체(5)에 의한 반사되는 또는 기록매체(5)를 투과하는 빛의 강도가 일정한 값으로 조절되는 것을 특징으로 하는 광학스캐닝장치.
  2. 제 1 항에 있어서, 하나의 광검출기가 설치되어 기록매체(5)에 의해 반사되는 또는 기록매체(5)를 투과하는 빛을 수신하고, 그 출력신호가 빛의 강도를 일정한 값으로 제어하는데 사용되는 것을 특징으로 하는 광학스캐닝장치.
  3. 제 1 항에 있어서, 광원(1)에 의해 발생된 광빔은 제 1 렌즈(2), 제 1 빔스플리터(3) 및 제 2 렌즈(4)를 통해 기록매체(5)로 조사되고, 기록매체(5)에 의해 반사된 광빔은 제 1 렌즈를 통해 제 1 빔스플리터(3)로 다시 진행하며, 거거서 광빔은 제 2 빔스플리터(6)로 진행하고, 제 2 빔스플리터(6)는 광빔을 제 3 렌즈(12) 및 제 3 빔스플리터(13)를 통해 제 3 광검출기(16)로 진행하게 하며, 제 3 광검출기(16)의 출력신호로부터 트래킹 제어회로에 대한 트래킹에러신호가 형성되고, 제 3 빔스플리터(13)는 광빔을 제 4 렌즈(14)를 통해 제 4 광검출기(15)로 진행하게 하고, 제 4 광검출기(15)의 출력신호로부터 포커싱제어회로에 대한 포커싱에러신호가 형성되며, 제 2 빔스플리터(6)는 광빔을 λ/2플레이트(7), 편파 빔 스퓰터(8) 및 제 5 렌즈(9)를 통해 제 1 광검출기(11)로 진행하게 하고, 편파 빔스플리터(8)는 광빔을 제 6 렌즈(10)를 통해 제 2 검출기(17)로 진행하게 하며, 제 1 광검출기(11)의 출력단은 제 1 증폭기(19)를 통해 가산증폭기(21)의 한 입력단 및 차동증폭기(20)의 감산입력단과 연결되고, 제 2 광검출기(17)의 출력단은 제 2 증폭기(18)를 통해 가산증폭기(21)의 다른 입력단 및 차동증폭기(20)의 가산입력단과, 연결되며, 가산증폭기(21)의 출력단은 제어기(22)를 통해 변조기(23)와 연결되고 변조기(23)의 출력단은 광원의 제어입력단과 연결되며, 치동증폭기(20)의 출력단에서는 기록매체(5)의 자구에 기억된 데이타를 포함하는 데이타신호(MS)가 출력될 수 있는 것을 특징으로 하는 광학스캐닝장치.
  4. 제 1 항에 있어서, 광원(1)에 의해 발생된 광빔은 제 1 렌즈(2), 제 1 빔스플리터(3) 및 제 2 렌즈(4)를 통해 기록매체(5)로 조사되고, 기록매체(5)뒤에 편파 빔스플리터(31)가 설치되며,기록매체에 의해 반사된 광빔은 제 2 렌즈(4)를 통해 제 1 빔스플리터(3)로 다시 진행하고 거기서 제 3 렌즈(12)를 통해 제 2 빔스플리터(13)로 진행하며, 제 2 빔스플리터(13)는 광빔을 제 4 렌즈(14)를 통해 제 3 광검출기(15)로 진행하게 하고, 제 3 광검출기(15)의 출력신호로부터 포커싱제어회로에 대한 포커싱에러신호가 형성되며, 제 2 빔스플리터(13)는 또한 광빔을 제 4 광검출기(16)로 진행하게 하고, 제 4 광검출기의 출력신호로부터 트래킹제어회로에 대한 트래킹 에러신호가 형성되며, 가산증폭기(21)에서 제1 및 제2 광검출기(28,29)이 출력전압의 합계가 형성되고, 가산증폭기(21)의 출력단은 제어기(22)를 통해 변조기(23)의 입력단과 연결되며, 변조기(23)는 기록매체(5)를 투과하는 빛이 강도가 일정한 값으로 조절되도록 광원(1)의 출력을 제어하는 것을 특징으로 하는 광학스캐닝장치.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019880012602A 1987-09-30 1988-09-29 자기광학 기록매체의 판독 방법 및 이 방법을 수행하기 위한 광학 스캐닝 장치 KR970007168B1 (ko)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873732874 DE3732874A1 (de) 1987-09-30 1987-09-30 Optische abtastvorrichtung
DEP3732874.3 1987-09-30

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KR890005678A true KR890005678A (ko) 1989-05-16
KR970007168B1 KR970007168B1 (ko) 1997-05-03

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KR1019880012602A KR970007168B1 (ko) 1987-09-30 1988-09-29 자기광학 기록매체의 판독 방법 및 이 방법을 수행하기 위한 광학 스캐닝 장치
KR1019880012601A KR970007167B1 (ko) 1987-09-30 1988-09-29 광학 및 자기광학 기록매체를 판독하는 방법, 및 이 방법을 수행하기 위한 광학 스캐닝 장치

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KR1019880012601A KR970007167B1 (ko) 1987-09-30 1988-09-29 광학 및 자기광학 기록매체를 판독하는 방법, 및 이 방법을 수행하기 위한 광학 스캐닝 장치

Country Status (12)

Country Link
US (1) US5014253A (ko)
EP (2) EP0310795B1 (ko)
JP (2) JPH01166351A (ko)
KR (2) KR970007168B1 (ko)
AT (2) ATE86777T1 (ko)
DE (3) DE3732874A1 (ko)
DK (2) DK548388A (ko)
ES (2) ES2039531T3 (ko)
GR (1) GR3004667T3 (ko)
HK (2) HK15896A (ko)
HU (2) HUT62723A (ko)
MY (2) MY103616A (ko)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100423824B1 (ko) * 1998-08-20 2004-03-22 마쯔시다덴기산교 가부시키가이샤 레이저 파워 제어 장치 및 광 디스크 장치

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5325350A (en) * 1986-09-28 1994-06-28 Deutsche Thomson-Brandt Gmbh Pick-up for selectively reading and writing an optical recording medium having pits and magnetic domains
JPH0340252A (ja) * 1989-04-19 1991-02-21 Olympus Optical Co Ltd 光磁気記録媒体の位相差測定装置
DE3923328A1 (de) * 1989-07-14 1991-01-24 Thomson Brandt Gmbh Magneto-optisches aufnahme- und/oder wiedergabegeraet
NL8902728A (nl) * 1989-11-06 1991-06-03 Philips Nv Werkwijze en inrichting voor het inschrijven en uitlezen van een magneto-optische registratiedrager.
US5105415A (en) * 1989-12-11 1992-04-14 International Business Machines Corporation Detecting magnetooptic and intensity-modulated optical signals with the same detector
EP0447265B1 (en) * 1990-03-16 1997-05-21 Canon Kabushiki Kaisha Optical information recording/reproducing apparatus
US5712840A (en) * 1990-03-16 1998-01-27 Canon Kabushiki Kaisha Optical information recording/reproduciing apparatus having two-division detectors
JP2809835B2 (ja) * 1990-07-30 1998-10-15 松下電器産業株式会社 光ディスク装置および光ディスク
DE4127840A1 (de) * 1991-08-22 1993-02-25 Thomson Brandt Gmbh Optische abtastvorrichtung
DE4140806A1 (de) * 1991-12-11 1993-06-17 Thomson Brandt Gmbh Optische abtastvorrichtung
US5265085A (en) * 1992-06-15 1993-11-23 International Business Machines Simultaneous MO and ROM optical disk signal detection
DE4220486A1 (de) * 1992-06-23 1994-01-05 Thomson Brandt Gmbh Aufzeichnung und Wiedergabe von Informationen bei ROM-RAM-Speichermedien
DE4226777A1 (de) * 1992-08-13 1994-02-17 Thomson Brandt Gmbh Rauschanteilverringerung im Datensignal und optische Abtastvorrichtung
US5233175A (en) * 1992-08-24 1993-08-03 International Business Machines Corporation Laser power control independent of beamsplitter transmissivity
KR100230225B1 (ko) * 1992-11-30 1999-11-15 윤종용 발광램프를 이용한 광픽업
JPH0714231A (ja) * 1993-06-29 1995-01-17 Sharp Corp 光磁気ディスク、光ピックアップ及び光磁気ディスク装置
KR950013702B1 (ko) * 1993-07-15 1995-11-13 엘지전자주식회사 광자기 디스크의 광픽업 장치
TW238381B (en) * 1993-10-29 1995-01-11 Ibm Optical data storage cartridge system
DE4415508A1 (de) 1994-05-03 1995-11-09 Thomson Brandt Gmbh Abtastgerät mit Adaptation
US5586101A (en) * 1995-03-01 1996-12-17 Eastman Kodak Company Magneto-optic data storage system with differential detection channels having separate gain control circuit
US5537383A (en) * 1995-03-01 1996-07-16 Eastman Kodak Company Optical data storage system with differential data detection and source noise subtraction for use with magneto-optic, write-once and other optical media
WO2003060897A1 (fr) 2002-01-11 2003-07-24 Fujitsu Limited Dispositif de stockage
JP3913671B2 (ja) * 2002-12-09 2007-05-09 株式会社リコー 情報記録方法および情報記録再生装置
US7763198B2 (en) * 2005-04-12 2010-07-27 Abbott Cardiovascular Systems Inc. Method for retaining a vascular stent on a catheter
KR100791083B1 (ko) * 2007-10-17 2008-01-03 대원계전주식회사 전원 개폐용 스위치

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5923013B2 (ja) * 1977-05-31 1984-05-30 日本電信電話株式会社 光学的信号再生装置
JPS54143109A (en) * 1978-04-28 1979-11-08 Hitachi Ltd Optical information device
DE2953304C2 (de) * 1978-11-01 1985-08-08 Hitachi, Ltd., Tokio/Tokyo Vorrichtung zum Lesen von magnetisch gespeicherter Information
JPS57147148A (en) * 1981-03-05 1982-09-10 Olympus Optical Co Ltd Information reproducer with magnetooptic system
JPS5979446A (ja) * 1982-10-28 1984-05-08 Sharp Corp 磁気光学ヘッド
JPS6035351A (ja) * 1983-08-06 1985-02-23 Brother Ind Ltd 光磁気再生装置
JPH0664765B2 (ja) * 1984-06-29 1994-08-22 株式会社日立製作所 情報記録再生装置
JPS61222037A (ja) * 1985-03-27 1986-10-02 Toshiba Corp デイスク装置
FR2597643A1 (fr) * 1985-11-08 1987-10-23 Seiko Epson Corp Systeme de lecture de signal magneto-optique
JPS62110643A (ja) * 1985-11-08 1987-05-21 Seiko Epson Corp 光磁気信号検出方法
FR2591787A1 (fr) * 1985-12-13 1987-06-19 Thomson Csf Dispositif d'enregistrement-lecture polyvalent de support d'enregistrement
JPS62170054A (ja) * 1986-01-21 1987-07-27 Seiko Epson Corp 光学ヘツド

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100423824B1 (ko) * 1998-08-20 2004-03-22 마쯔시다덴기산교 가부시키가이샤 레이저 파워 제어 장치 및 광 디스크 장치

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ES2039531T3 (es) 1993-10-01
DK548388D0 (da) 1988-09-30
HK15896A (en) 1996-02-02
MY103615A (en) 1993-08-28
DE3879073D1 (de) 1993-04-15
US5014253A (en) 1991-05-07
JPH01166350A (ja) 1989-06-30
ATE86777T1 (de) 1993-03-15
JPH01166351A (ja) 1989-06-30
HK13596A (en) 1996-02-02
HUT61121A (en) 1992-11-30
KR970007168B1 (ko) 1997-05-03
EP0310795B1 (de) 1993-03-10
JP3112907B2 (ja) 2000-11-27
DK548188A (da) 1989-03-31
MY103616A (en) 1993-08-28
GR3004667T3 (ko) 1993-04-28
HUT62723A (en) 1993-05-28
KR890005677A (ko) 1989-05-16
ATE74682T1 (de) 1992-04-15
ES2031193T3 (es) 1992-12-01
DE3869894D1 (de) 1992-05-14
DK548388A (da) 1989-03-31
KR970007167B1 (ko) 1997-05-03
EP0310795A1 (de) 1989-04-12
DE3732874A1 (de) 1989-04-20
DK548188D0 (da) 1988-09-30
EP0310812B1 (de) 1992-04-08
EP0310812A1 (de) 1989-04-12

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