DE69031366T2 - Optisches System - Google Patents

Optisches System

Info

Publication number
DE69031366T2
DE69031366T2 DE69031366T DE69031366T DE69031366T2 DE 69031366 T2 DE69031366 T2 DE 69031366T2 DE 69031366 T DE69031366 T DE 69031366T DE 69031366 T DE69031366 T DE 69031366T DE 69031366 T2 DE69031366 T2 DE 69031366T2
Authority
DE
Germany
Prior art keywords
optical system
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 - Fee Related
Application number
DE69031366T
Other languages
English (en)
Other versions
DE69031366D1 (de
Inventor
Yasuo Kimura
Yuzo Ono
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 JP1164227A external-priority patent/JP2576632B2/ja
Priority claimed from JP1164228A external-priority patent/JP2616018B2/ja
Application filed by NEC Corp filed Critical NEC Corp
Application granted granted Critical
Publication of DE69031366D1 publication Critical patent/DE69031366D1/de
Publication of DE69031366T2 publication Critical patent/DE69031366T2/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
    • 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
    • G11B11/10532—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
    • G11B11/10532—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
    • 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
    • G11B7/0901—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 for track following only
    • 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
    • G11B7/0908—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 for focusing only
    • G11B7/0916—Foucault or knife-edge methods
    • 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
    • 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
    • G11B7/1381—Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops
DE69031366T 1989-06-26 1990-06-26 Optisches System Expired - Fee Related DE69031366T2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1164227A JP2576632B2 (ja) 1989-06-26 1989-06-26 光磁気ヘッド装置
JP1164228A JP2616018B2 (ja) 1989-06-26 1989-06-26 光ヘッド装置

Publications (2)

Publication Number Publication Date
DE69031366D1 DE69031366D1 (de) 1997-10-09
DE69031366T2 true DE69031366T2 (de) 1998-04-09

Family

ID=26489419

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69031366T Expired - Fee Related DE69031366T2 (de) 1989-06-26 1990-06-26 Optisches System

Country Status (3)

Country Link
US (1) US5493555A (de)
EP (1) EP0405444B1 (de)
DE (1) DE69031366T2 (de)

Families Citing this family (28)

* 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
US5241523A (en) * 1991-12-05 1993-08-31 Eastman Kodak Company Polarization-based auto-focus apparatus
DE69223124T2 (de) * 1991-12-18 1998-03-26 Nec Corp System für magneto-optischen Kopf
US5353267A (en) * 1992-06-02 1994-10-04 Nec Corporation Magneto-optical light detector apparatus
EP0790605B1 (de) * 1992-08-07 2001-06-13 Matsushita Electric Industrial Co., Ltd. Optische Speichervorrichtung
DE69424204T2 (de) * 1993-02-16 2000-09-07 Nec Corp Optischer Abtasthopf und doppelbrechender Beugungsgitterpolarisator sowie Hologrammpolarisator dafür.
US5550798A (en) * 1993-04-13 1996-08-27 Sony Corporation Enhanced optical beam splitter to increase the kerr rotation angle
JPH07176095A (ja) * 1993-06-25 1995-07-14 Nec Corp 光磁気ヘッド装置
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
CN1134677C (zh) * 1994-04-14 2004-01-14 株式会社三协精机制作所 偏振光束分束器及使用偏振光束分束器的光探头
JPH07311961A (ja) * 1994-05-16 1995-11-28 Nippon Steel Corp 光ピックアップ
CN1135802A (zh) * 1994-07-29 1996-11-13 索尼公司 光拾波装置
JP3047314B2 (ja) * 1995-01-12 2000-05-29 株式会社リコー 光ヘッド
US6167006A (en) * 1995-03-31 2000-12-26 Kabushiki Kaisha Toshiba Optical information recording/reproducing apparatus based on tracking control of irradiated light
US5796701A (en) * 1995-06-23 1998-08-18 Sony Corporation Optical pickup and opto-magnetic signal reproducing apparatus
JPH0950653A (ja) * 1995-08-04 1997-02-18 Asahi Optical Co Ltd 光磁気ヘッド装置
JPH09230140A (ja) * 1996-02-27 1997-09-05 Sankyo Seiki Mfg Co Ltd 偏光分離素子およびその製造方法
US5677902A (en) * 1996-06-28 1997-10-14 Eastman Kodak Company Beam splitter for optical recording
US5710753A (en) * 1996-06-28 1998-01-20 Eastman Kodak Company Multi-element grating beam splitter using double refraction to reduce optical feedback and associated light source noise
DE19638878A1 (de) * 1996-09-23 1998-03-26 Thomson Brandt Gmbh Aufzeichnungs- oder Wiedergabegerät zum Aufzeichnen auf oder Wiedergeben von einem optischen Aufzeichnungsträger
EP0971345B1 (de) * 1996-12-19 2006-05-03 Matsushita Electric Industrial Co., Ltd. Optische platte und verfahren zur aufzeichnung auf der optischer platte
CN1112685C (zh) 1998-04-14 2003-06-25 德国汤姆森-布兰特有限公司 读写光学记录介质的设备
DE19825208A1 (de) * 1998-04-14 1999-10-21 Thomson Brandt Gmbh Gerät zum Lesen oder Beschreiben optischer Aufzeichnungsträger
US6418098B1 (en) * 1998-06-03 2002-07-09 Kabushiki Kaisha Toshiba Optical head apparatus for reproducing information from an optical recording medium
US7492517B2 (en) * 2003-05-06 2009-02-17 New Light Industries, Ltd. Form birefringent grating structure, viewer, anticounterfeit security device, and method for making the same
US20040228236A1 (en) * 2003-05-13 2004-11-18 Sharp Kabushiki Kaisha Optical pickup device
JP4806643B2 (ja) * 2007-03-09 2011-11-02 株式会社日立メディアエレクトロニクス 光ピックアップ及び光ディスク装置
JP6033890B2 (ja) * 2012-02-21 2016-11-30 エーエスエムエル ネザーランズ ビー．ブイ． 検査装置及び方法

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4858218A (en) * 1984-09-12 1989-08-15 Nikon Corporation Optical recording medium and reproducing apparatus
FR2597249B1 (fr) * 1986-04-11 1988-06-17 Thomson Csf Dispositif de lecture optique de support d'enregistrement optique
HU197681B (en) * 1986-05-08 1989-05-29 Malomipari Kutato Intezet Apparatus and method for classing granular materials particularly wheat connected with grinding
DE3786497T2 (de) * 1986-07-18 1994-02-17 Nec Corp Doppelbrechendes Beugungsgitter und optischer Kopf, in welchem ein linearpolarisierter Strahl auf dieses Gitter gelenkt wird.
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
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
US4918675A (en) * 1986-12-04 1990-04-17 Pencom International Corporation Magneto-optical head with separate optical paths for error and data detection
JPS63314502A (ja) * 1986-12-16 1988-12-22 Nec Corp 複屈折回折格子型光偏光板
EP0273356B1 (de) * 1986-12-25 1992-04-29 Nec Corporation Optischer Kopf
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
US4933924A (en) * 1987-07-03 1990-06-12 Seiko Epson Corporation Optical head and magneto-optical read/write device
US4989189A (en) * 1988-08-22 1991-01-29 Eastman Kodak Company Magneto-optic playback apparatus including astigmatic diffracting means

Also Published As

Publication number Publication date
EP0405444A3 (en) 1992-07-29
EP0405444A2 (de) 1991-01-02
EP0405444B1 (de) 1997-09-03
DE69031366D1 (de) 1997-10-09
US5493555A (en) 1996-02-20

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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