DE69318486D1 - Magneto-optische Kopfeinrichtung - Google Patents

Magneto-optische Kopfeinrichtung

Info

Publication number
DE69318486D1
DE69318486D1 DE69318486T DE69318486T DE69318486D1 DE 69318486 D1 DE69318486 D1 DE 69318486D1 DE 69318486 T DE69318486 T DE 69318486T DE 69318486 T DE69318486 T DE 69318486T DE 69318486 D1 DE69318486 D1 DE 69318486D1
Authority
DE
Germany
Prior art keywords
magneto
optical head
head device
optical
head
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 - Fee Related
Application number
DE69318486T
Other languages
English (en)
Other versions
DE69318486T2 (de
Inventor
Ryuichi Katayama
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.)
NEC Corp
Original Assignee
NEC 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
Priority claimed from JP04140832A external-priority patent/JP3123216B2/ja
Priority claimed from JP4192554A external-priority patent/JP3047630B2/ja
Application filed by NEC Corp filed Critical NEC Corp
Application granted granted Critical
Publication of DE69318486D1 publication Critical patent/DE69318486D1/de
Publication of DE69318486T2 publication Critical patent/DE69318486T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/13—Optical detectors therefor
    • G11B7/131—Arrangement of detectors in a multiple array
    • 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
    • G11B11/1055—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
    • G11B7/08—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
    • G11B7/0943—Methods and circuits for performing mathematical operations on individual detector segment outputs
    • 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
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1353—Diffractive elements, e.g. holograms or gratings

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)
DE69318486T 1992-06-02 1993-06-02 Magneto-optische Kopfeinrichtung Expired - Fee Related DE69318486T2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP04140832A JP3123216B2 (ja) 1992-06-02 1992-06-02 光磁気ヘッド装置
JP4192554A JP3047630B2 (ja) 1992-07-21 1992-07-21 光磁気ヘッド装置

Publications (2)

Publication Number Publication Date
DE69318486D1 true DE69318486D1 (de) 1998-06-18
DE69318486T2 DE69318486T2 (de) 1998-11-26

Family

ID=26473236

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69318486T Expired - Fee Related DE69318486T2 (de) 1992-06-02 1993-06-02 Magneto-optische Kopfeinrichtung

Country Status (3)

Country Link
US (1) US5353267A (de)
EP (1) EP0582059B1 (de)
DE (1) DE69318486T2 (de)

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5804814A (en) * 1994-05-20 1998-09-08 Musha; Toru Optical pick-up head and integrated type optical unit for use in optical pick-up head
JP3047342B2 (ja) * 1993-06-21 2000-05-29 富士通株式会社 光学的情報記録再生装置
US6185166B1 (en) 1993-06-21 2001-02-06 Fujitsu Limited Optical information recording/reproducing apparatus
DE4322149A1 (de) * 1993-06-21 1994-12-22 Fujitsu Ltd Optische Informationsaufzeichnungs-/Wiedergabevorrichtung
JPH07130022A (ja) * 1993-11-08 1995-05-19 Matsushita Electric Ind Co Ltd 光ヘッド装置および光学素子
JPH07311961A (ja) * 1994-05-16 1995-11-28 Nippon Steel Corp 光ピックアップ
KR100200832B1 (ko) * 1994-11-29 1999-06-15 윤종용 포커스 에러검출장치
DE69621678T2 (de) * 1995-03-14 2002-11-28 Kabushiki Kaisha Toshiba, Kawasaki Lichtdetektor
US5796701A (en) * 1995-06-23 1998-08-18 Sony Corporation Optical pickup and opto-magnetic signal reproducing apparatus
JPH0917029A (ja) * 1995-06-26 1997-01-17 Pioneer Electron Corp 光ディスクとその読取装置および光ディスク製造方法
US6292441B1 (en) * 1997-04-16 2001-09-18 Matsushita Electric Industrial Co., Ltd. Optical head device, optical information apparatus, and method for detecting focus error signal
JPH11161973A (ja) * 1997-09-24 1999-06-18 Fujitsu Ltd 光学的情報記録／再生装置
JP3063707B2 (ja) * 1997-10-30 2000-07-12 日本電気株式会社 光ヘッド装置
JPH11185279A (ja) * 1997-12-16 1999-07-09 Fujitsu Ltd 光学的情報記録／再生装置
US6418098B1 (en) * 1998-06-03 2002-07-09 Kabushiki Kaisha Toshiba Optical head apparatus for reproducing information from an optical recording medium
US20020182307A1 (en) * 1999-02-18 2002-12-05 City University Of Hong Kong Organic electroluminescent devices with organic layers deposited at elevated substrate temperatures
US6339565B1 (en) * 1999-03-31 2002-01-15 Lsi Logic Corporation Non-linear center-error generator for DVD servo control
JP2001014717A (ja) 1999-04-28 2001-01-19 Matsushita Electronics Industry Corp 光学装置
US6822934B2 (en) * 2000-06-21 2004-11-23 Matsushita Electric Industrial Co., Ltd. Optical disc apparatus for finding a tracking error for an optical disk
CN100474416C (zh) * 2001-06-04 2009-04-01 松下电器产业株式会社 光拾取头及信息记录再现装置
JP4242108B2 (ja) * 2001-06-04 2009-03-18 パナソニック株式会社 光ピックアップヘッドおよび情報記録再生装置
JP4040576B2 (ja) * 2001-11-09 2008-01-30 シャープ株式会社 光集積化ユニットおよびそれを用いる光ピックアップ装置、光ディスク装置
JP4083720B2 (ja) * 2004-09-17 2008-04-30 シャープ株式会社 光ピックアップ装置
US8768664B2 (en) * 2005-03-18 2014-07-01 CMC Solutions, LLC. Predictive emissions monitoring using a statistical hybrid model
US7421348B2 (en) * 2005-03-18 2008-09-02 Swanson Brian G Predictive emissions monitoring method
US11579014B1 (en) * 2020-08-20 2023-02-14 Amazon Technologies, Inc. Optical detector system

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5270996A (en) * 1986-12-25 1993-12-14 Nec Corporation Optical head with diffraction grating producing five diffracted detection light beams
JPH0738260B2 (ja) * 1987-04-01 1995-04-26 日本電気株式会社 光磁気用光ヘツド装置
DE3732944A1 (de) * 1987-09-30 1989-04-13 Thomson Brandt Gmbh Optische abtastvorrichtung
JP2649231B2 (ja) * 1987-11-20 1997-09-03 株式会社 日本コンラックス 光学的情報再生装置
JP2583273B2 (ja) * 1988-04-04 1997-02-19 株式会社日本コンラックス 光学的情報記録再生方法および装置
US5066138A (en) * 1988-06-16 1991-11-19 Mitsubishi Denki Kabushiki Kaisha Optical head apparatus
US4989189A (en) * 1988-08-22 1991-01-29 Eastman Kodak Company Magneto-optic playback apparatus including astigmatic diffracting means
EP0405444B1 (de) * 1989-06-26 1997-09-03 Nec Corporation Optisches System
JP2711010B2 (ja) * 1990-04-04 1998-02-10 株式会社日本コンラックス 光学ヘッド

Also Published As

Publication number Publication date
EP0582059B1 (de) 1998-05-13
US5353267A (en) 1994-10-04
DE69318486T2 (de) 1998-11-26
EP0582059A3 (de) 1995-01-25
EP0582059A2 (de) 1994-02-09

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee