CA940229A - Magneto-optic transducer - Google Patents

Magneto-optic transducer

Info

Publication number
CA940229A
CA940229A CA115,394A CA115394A CA940229A CA 940229 A CA940229 A CA 940229A CA 115394 A CA115394 A CA 115394A CA 940229 A CA940229 A CA 940229A
Authority
CA
Canada
Prior art keywords
magneto
optic transducer
optic
transducer
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
Application number
CA115,394A
Other languages
English (en)
Other versions
CA115394S (en
Inventor
John K. Alstad
John D. Armitage (Jr.)
Geoffrey Bate
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 CA940229A publication Critical patent/CA940229A/en
Expired 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
    • G11B11/10547—Heads for reproducing using optical beam of radiation interacting with the magnetisation of an intermediate transfer element, e.g. magnetic film, included in the head
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on magneto-optical elements, e.g. exhibiting Faraday effect

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
CA115,394A 1970-06-25 1971-06-11 Magneto-optic transducer Expired CA940229A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US4975870A 1970-06-25 1970-06-25

Publications (1)

Publication Number Publication Date
CA940229A true CA940229A (en) 1974-01-15

Family

ID=21961558

Family Applications (1)

Application Number Title Priority Date Filing Date
CA115,394A Expired CA940229A (en) 1970-06-25 1971-06-11 Magneto-optic transducer

Country Status (6)

Country Link
US (1) US3665431A (enExample)
CA (1) CA940229A (enExample)
CH (1) CH528742A (enExample)
DE (1) DE2130702A1 (enExample)
FR (1) FR2095550A5 (enExample)
GB (1) GB1287864A (enExample)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4202022A (en) * 1975-10-20 1980-05-06 Kokusai Denshin Denwa Kabushiki Kaisha Magnetic transfer record film and apparatus for magneto-optically reading magnetic record patterns using the same
CA1190321A (en) * 1981-10-29 1985-07-09 Toshihisa Deguchi Magneto-optical head assembly
JPS593718A (ja) * 1982-06-30 1984-01-10 Toshiba Corp 磁気ヘツド
US4594699A (en) * 1983-06-20 1986-06-10 Datatape Incorporated Faraday-effect magneto-optic transducer apparatus of a rotary form
EP0147436B1 (en) * 1983-06-20 1989-08-23 Datatape Incorporated Apparatus for reading magnetically recorded information
US4609961A (en) * 1984-08-20 1986-09-02 Datatape Incorporated Faraday-effect magneto-optic transducer
US4654837A (en) * 1985-09-06 1987-03-31 Datatape Incorporated Magneto-optic transducer with enhanced signal performance
US5085935A (en) * 1988-08-03 1992-02-04 Digital Equipment Corporation Flux spreading thin film magnetic devices
FR2656723B1 (fr) * 1989-12-28 1995-07-21 Thomson Consumer Electronics Tete de lecture multipiste magneto-optique.
FR2696037B1 (fr) * 1992-09-18 1994-11-04 Thomson Csf Dispositif de lecture magnétique.
FR2740278B1 (fr) * 1995-10-20 1997-11-07 Thomson Csf Modulateur d'onde electromagnetique
FR2797708B1 (fr) * 1999-08-20 2002-07-12 Thomson Csf Tete de lecture magnetique
DE102004025937A1 (de) * 2004-05-27 2005-12-22 Giesecke & Devrient Gmbh Vorrichtung und Verfahren zur Untersuchung von magnetichen Eigenschaften von Objekten

Also Published As

Publication number Publication date
GB1287864A (enExample) 1972-09-06
CH528742A (de) 1972-09-30
FR2095550A5 (enExample) 1972-02-11
US3665431A (en) 1972-05-23
DE2130702A1 (de) 1971-12-30

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