DE69027665D1 - Verwendung des Restlaserlichts in optischen Systemen - Google Patents

Verwendung des Restlaserlichts in optischen Systemen

Info

Publication number
DE69027665D1
DE69027665D1 DE69027665T DE69027665T DE69027665D1 DE 69027665 D1 DE69027665 D1 DE 69027665D1 DE 69027665 T DE69027665 T DE 69027665T DE 69027665 T DE69027665 T DE 69027665T DE 69027665 D1 DE69027665 D1 DE 69027665D1
Authority
DE
Germany
Prior art keywords
laser light
optical systems
residual laser
residual
optical
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
DE69027665T
Other languages
English (en)
Inventor
Blair Ian Finkelstein
Daniel Terry Wayne Mc
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.)
International Business Machines Corp
Original Assignee
International Business Machines 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 International Business Machines Corp filed Critical International Business Machines Corp
Application granted granted Critical
Publication of DE69027665D1 publication Critical patent/DE69027665D1/de
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
    • 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
    • G11B11/10545—Heads for reproducing using optical beam of radiation interacting directly with the magnetisation on the record 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
    • G11B11/10502—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
    • G11B11/1055—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
    • 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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/005—Reproducing
DE69027665T 1990-01-16 1990-12-17 Verwendung des Restlaserlichts in optischen Systemen Expired - Lifetime DE69027665D1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/465,849 US5115420A (en) 1990-01-16 1990-01-16 Utilizing wasted laser light in optical systems

Publications (1)

Publication Number Publication Date
DE69027665D1 true DE69027665D1 (de) 1996-08-08

Family

ID=23849417

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69027665T Expired - Lifetime DE69027665D1 (de) 1990-01-16 1990-12-17 Verwendung des Restlaserlichts in optischen Systemen

Country Status (4)

Country Link
US (1) US5115420A (de)
EP (1) EP0438042B1 (de)
JP (1) JP2522858B2 (de)
DE (1) DE69027665D1 (de)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5157459A (en) * 1989-08-29 1992-10-20 Asahi Kogaku Kogyo Kabushiki Kaisha Wave front aberration measuring apparatus
KR930020374A (ko) * 1992-03-31 1993-10-19 정용문 광픽업
JP2897532B2 (ja) * 1992-06-02 1999-05-31 日本電気株式会社 相変化型光ディスクの再生方法
JP2783397B2 (ja) * 1992-09-24 1998-08-06 シャープ株式会社 光記録情報読み出し装置及び読み出し方法
JP3392206B2 (ja) * 1994-03-11 2003-03-31 パイオニア株式会社 光ピックアップ
US5619371A (en) * 1995-03-02 1997-04-08 Southern Research Institute Confocal optical microscopy system for multi-layer data storage and retrieval
US6483797B1 (en) * 1999-08-20 2002-11-19 Lots Technology, Inc. Apparatuses and methods for reading after writing in optical recording systems
US6724711B2 (en) * 2001-03-09 2004-04-20 Imation Corp. Apparatuses and methods for directing light beams in an optical recording system
JP2007317284A (ja) * 2006-05-25 2007-12-06 Hitachi Ltd 光ディスク装置
JP4861948B2 (ja) * 2007-02-23 2012-01-25 株式会社日立製作所 光ヘッドおよび光ディスク装置
CN112750470B (zh) * 2019-10-30 2022-05-31 华为技术有限公司 一种检测装置、光驱及检测方法

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5515685B2 (de) * 1972-06-30 1980-04-25
JPS5768813A (en) * 1980-10-17 1982-04-27 Matsushita Electric Ind Co Ltd Optical information reader
JPS57111843A (en) * 1980-12-27 1982-07-12 Canon Inc Vertical magnetic reading optical system
JPS5911548A (ja) * 1982-07-12 1984-01-21 Hitachi Ltd 光ピツクアツプ装置
JPH0673193B2 (ja) * 1984-07-31 1994-09-14 沖電気工業株式会社 光ディスクメモリの再生方法及び装置
JPS6145439A (ja) * 1984-08-08 1986-03-05 Canon Inc 光信号読取り法および装置
JPH0762913B2 (ja) * 1984-08-17 1995-07-05 株式会社日立製作所 自動焦点制御方法
JPS61126637A (ja) * 1984-11-21 1986-06-14 Olympus Optical Co Ltd 光学的情報記録再生装置
JPS61227237A (ja) * 1985-04-02 1986-10-09 Mitsubishi Electric Corp 光学的情報再生装置
JPS63195831A (ja) * 1987-02-09 1988-08-12 Minolta Camera Co Ltd 自動合焦装置
US4823220A (en) * 1987-11-16 1989-04-18 International Business Machines Corporation Detector for magnetooptic recorders

Also Published As

Publication number Publication date
EP0438042A2 (de) 1991-07-24
EP0438042B1 (de) 1996-07-03
JPH05135419A (ja) 1993-06-01
EP0438042A3 (en) 1992-07-08
US5115420A (en) 1992-05-19
JP2522858B2 (ja) 1996-08-07

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Legal Events

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