DE69123192D1 - Optischer Kopf für magnetooptisches Informationswiedergabegerät - Google Patents

Optischer Kopf für magnetooptisches Informationswiedergabegerät

Info

Publication number
DE69123192D1
DE69123192D1 DE69123192T DE69123192T DE69123192D1 DE 69123192 D1 DE69123192 D1 DE 69123192D1 DE 69123192 T DE69123192 T DE 69123192T DE 69123192 T DE69123192 T DE 69123192T DE 69123192 D1 DE69123192 D1 DE 69123192D1
Authority
DE
Germany
Prior art keywords
magneto
optical
reproducing device
information reproducing
optical information
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
DE69123192T
Other languages
English (en)
Other versions
DE69123192T2 (de
Inventor
Osamu Koyama
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Publication of DE69123192D1 publication Critical patent/DE69123192D1/de
Application granted granted Critical
Publication of DE69123192T2 publication Critical patent/DE69123192T2/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
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1356—Double or multiple prisms, i.e. having two or more prisms in cooperation
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • 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
    • G11B7/12—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
    • G11B7/1395—Beam splitters or combiners

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Head (AREA)
DE69123192T 1990-07-26 1991-07-25 Optischer Kopf für magnetooptisches Informationswiedergabegerät Expired - Fee Related DE69123192T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2196105A JP2798185B2 (ja) 1990-07-26 1990-07-26 光磁気式情報再生装置用光学ヘッド

Publications (2)

Publication Number Publication Date
DE69123192D1 true DE69123192D1 (de) 1997-01-02
DE69123192T2 DE69123192T2 (de) 1997-04-10

Family

ID=16352318

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69123192T Expired - Fee Related DE69123192T2 (de) 1990-07-26 1991-07-25 Optischer Kopf für magnetooptisches Informationswiedergabegerät

Country Status (4)

Country Link
US (1) US5293371A (de)
EP (1) EP0468800B1 (de)
JP (1) JP2798185B2 (de)
DE (1) DE69123192T2 (de)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05114191A (ja) * 1991-10-22 1993-05-07 Canon Inc 複数ビーム光ヘツド
JPH0612719A (ja) * 1992-06-29 1994-01-21 Canon Inc 光ヘッド及び情報読取装置
US5694385A (en) * 1993-09-24 1997-12-02 Ricoh Comany, Ltd. Optical pickup apparatus
JP3167066B2 (ja) * 1993-10-06 2001-05-14 キヤノン株式会社 光記録再生装置
JPH07129992A (ja) * 1993-11-06 1995-05-19 Asahi Optical Co Ltd 情報記録再生装置
JP3548259B2 (ja) * 1994-04-07 2004-07-28 ペンタックス株式会社 光磁気ヘッド装置
US5541906A (en) * 1994-07-29 1996-07-30 Olympus Optical Co., Ltd. Optical head for magneto-optical record medium
JPH0950653A (ja) * 1995-08-04 1997-02-18 Asahi Optical Co Ltd 光磁気ヘッド装置
WO1999016061A1 (en) * 1997-09-22 1999-04-01 Seagate Technology, Inc. Apparatus and method for differential wax-wane focusing and push-pull tracking for magneto-optical data storage
JP3607836B2 (ja) * 1999-03-31 2005-01-05 シャープ株式会社 光ピックアップ装置
FR2802696B1 (fr) 1999-12-17 2002-07-19 Thomson Csf Lecteur magneto optique optimise par le polariseur de lumiere incidente
US20040001399A1 (en) * 2002-06-26 2004-01-01 Pentax Corporation Optical head for optical disc drive
JP2005166195A (ja) * 2003-12-04 2005-06-23 Canon Inc 光情報記録再生装置及び光情報記録再生方法
JP2006331471A (ja) * 2005-05-23 2006-12-07 Canon Inc 光情報記録再生装置
US7680013B2 (en) * 2005-11-29 2010-03-16 Canon Kabushiki Kaisha Optical information recording and reproducing apparatus
US7791986B2 (en) * 2006-03-15 2010-09-07 Canon Kabushiki Kaisha Optical information recording/reproducing apparatus

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07101523B2 (ja) * 1986-09-12 1995-11-01 キヤノン株式会社 光磁気信号再生装置
US4813032A (en) * 1986-10-17 1989-03-14 Canon Kabushiki Kaisha Magneto-optical information reproducing apparatus in which the azimuth angle of the transmission axis of an analyzer is optimized so that the C/N ratio of a reproducing signal is maximum
JPH0778916B2 (ja) * 1986-10-17 1995-08-23 キヤノン株式会社 光磁気情報再生装置
JPH0777038B2 (ja) * 1986-12-25 1995-08-16 ソニー株式会社 光学ピツクアツプ装置
JPH01165056A (ja) * 1987-09-21 1989-06-29 Sharp Corp 光情報記録再生装置
JPH01116930A (ja) * 1987-10-29 1989-05-09 Canon Inc 光ビーム位置検出装置
US5029154A (en) * 1988-11-21 1991-07-02 Ricoh Company, Ltd. Optical reproducing apparatus
DE69018503T2 (de) * 1989-05-02 1995-08-17 Pioneer Electronic Corp Optischer Kopf.
JPH0718963Y2 (ja) * 1989-05-16 1995-05-01 ブラザー工業株式会社 光学式表面粗さ測定装置
JP2984004B2 (ja) * 1989-08-28 1999-11-29 ソニー株式会社 カッテングマシン
US5187543A (en) * 1990-01-19 1993-02-16 Zygo Corporation Differential displacement measuring interferometer

Also Published As

Publication number Publication date
JP2798185B2 (ja) 1998-09-17
EP0468800B1 (de) 1996-11-20
EP0468800A1 (de) 1992-01-29
JPH0489643A (ja) 1992-03-23
DE69123192T2 (de) 1997-04-10
US5293371A (en) 1994-03-08

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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