DE3774630D1 - Optischer kopf. - Google Patents

Optischer kopf.

Info

Publication number
DE3774630D1
DE3774630D1 DE8787306185T DE3774630T DE3774630D1 DE 3774630 D1 DE3774630 D1 DE 3774630D1 DE 8787306185 T DE8787306185 T DE 8787306185T DE 3774630 T DE3774630 T DE 3774630T DE 3774630 D1 DE3774630 D1 DE 3774630D1
Authority
DE
Germany
Prior art keywords
optical head
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 - Lifetime
Application number
DE8787306185T
Other languages
English (en)
Inventor
Akira Takahashi
Toshihisa Deguchi
Yoshiteru Murakami
Michinobu Mieda
Kazou Van
Kenji Ohta
Hiroyuki Katayama
Tomoyuki Miyake
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.)
Sharp Corp
Original Assignee
Sharp 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 JP16532186A external-priority patent/JPS6320748A/ja
Priority claimed from JP61170545A external-priority patent/JPS6326847A/ja
Application filed by Sharp Corp filed Critical Sharp Corp
Application granted granted Critical
Publication of DE3774630D1 publication Critical patent/DE3774630D1/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
    • 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
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
DE8787306185T 1986-07-14 1987-07-13 Optischer kopf. Expired - Lifetime DE3774630D1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP16532186A JPS6320748A (ja) 1986-07-14 1986-07-14 磁気光学ヘツド
JP61170545A JPS6326847A (ja) 1986-07-18 1986-07-18 光ヘツド

Publications (1)

Publication Number Publication Date
DE3774630D1 true DE3774630D1 (de) 1992-01-02

Family

ID=26490101

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8787306185T Expired - Lifetime DE3774630D1 (de) 1986-07-14 1987-07-13 Optischer kopf.

Country Status (3)

Country Link
US (1) US5081614A (de)
EP (1) EP0253613B1 (de)
DE (1) DE3774630D1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2651454B2 (ja) * 1989-05-18 1997-09-10 株式会社アサカ マルチビーム光ディスク装置のトラッキング誤差検出部
JPH06309690A (ja) * 1993-04-26 1994-11-04 Sony Corp 光ピックアップ
JP2013008401A (ja) * 2009-10-21 2013-01-10 Panasonic Corp 光ピックアップ、光記録再生装置、及び微小スポット生成方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5926362Y2 (ja) * 1976-11-30 1984-07-31 大日本スクリ−ン製造株式会社 画像走査記録装置における露光用アパ−チヤ−
JPS5752006A (en) * 1980-08-19 1982-03-27 Olympus Optical Co Ltd Method and device for detecting focus
EP0068390B1 (de) * 1981-06-22 1990-08-22 Kabushiki Kaisha Toshiba Optischer Kopf
EP0075192B1 (de) * 1981-09-17 1990-03-14 Kabushiki Kaisha Toshiba Ein optischer Kopf
JPS5870434A (ja) * 1981-10-22 1983-04-26 Toshiba Corp 光学ヘツド
JPS58203646A (ja) * 1982-05-21 1983-11-28 Canon Inc 光磁気再生装置
JPS618744A (ja) * 1984-06-22 1986-01-16 Fuji Photo Film Co Ltd 光デイスク装置のフオ−カス誤差検出装置
JPS61177655A (ja) * 1985-01-31 1986-08-09 Olympus Optical Co Ltd 光磁気差動再生装置
JP2617176B2 (ja) * 1986-04-10 1997-06-04 シャープ株式会社 光ヘツド

Also Published As

Publication number Publication date
EP0253613B1 (de) 1991-11-21
EP0253613A3 (en) 1988-11-17
US5081614A (en) 1992-01-14
EP0253613A2 (de) 1988-01-20

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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