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FR2406865A1 - Dispositif de lecture de l'information enregistree sur un support magnetique - Google Patents

Dispositif de lecture de l'information enregistree sur un support magnetique

Info

Publication number
FR2406865A1
FR2406865A1 FR7829987A FR7829987A FR2406865A1 FR 2406865 A1 FR2406865 A1 FR 2406865A1 FR 7829987 A FR7829987 A FR 7829987A FR 7829987 A FR7829987 A FR 7829987A FR 2406865 A1 FR2406865 A1 FR 2406865A1
Authority
FR
France
Prior art keywords
reading
information recorded
magnetic media
polarization
recorded
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.)
Granted
Application number
FR7829987A
Other languages
English (en)
Other versions
FR2406865B1 (fr
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Publication of FR2406865A1 publication Critical patent/FR2406865A1/fr
Application granted granted Critical
Publication of FR2406865B1 publication Critical patent/FR2406865B1/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
    • G11B5/39—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects
    • G11B5/3903—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects using magnetic thin film layers or their effects, the films being part of integrated structures
    • G11B5/3906—Details related to the use of magnetic thin film layers or to their effects
    • G11B5/3916—Arrangements in which the active read-out elements are coupled to the magnetic flux of the track by at least one magnetic thin film flux guide
    • 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
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/49—Fixed mounting or arrangements, e.g. one head per track
    • G11B5/4907—Details for scanning
    • G11B5/4915—Structure of specially adapted heads
    • G11B5/4923—Structure of specially adapted heads in which zones of the transducing part are being physically controllable
    • G11B5/493—Control of magnetic properties, e.g. saturation, anisotropy
    • G11B5/4938—Control of magnetic properties, e.g. saturation, anisotropy of thin magnetic films
    • G11B5/4946—Control of magnetic properties, e.g. saturation, anisotropy of thin magnetic films for formation or displacement of magnetic domains, e.g. walls, bubbles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F10/00—Thin magnetic films, e.g. of one-domain structure
    • H01F10/08—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers
    • H01F10/10—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition
    • H01F10/18—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition being compounds
    • H01F10/20—Ferrites
    • H01F10/22—Orthoferrites, e.g. RFeO3 (R= rare earth element) with orthorhombic structure

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Power Engineering (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)
  • Magnetic Record Carriers (AREA)

Abstract

L'invention concerne la reproduction d'un enregistrement magnétique. Un appareil de lecture optique de l'information enregistrée sur une bande magnétique 11 comprend essentiellement un dispositif de lecture 12 qui produit une rotation de la polarisation d'un faisceau lumineux en fonction de l'information qui est enregistrée sur la bande 11. Un polariseur 17 et un transducteur photoélectrique 18 détectant les variations de polarisation et fournissent un signal de sortie correspondant sur la borne 19. Application à l'enregistrement des signaux sonores.
FR7829987A 1977-10-20 1978-10-20 Dispositif de lecture de l'information enregistree sur un support magnetique Granted FR2406865A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12619377A JPS5459915A (en) 1977-10-20 1977-10-20 Method and apparatus for reading of magnetic recording signal

Publications (2)

Publication Number Publication Date
FR2406865A1 true FR2406865A1 (fr) 1979-05-18
FR2406865B1 FR2406865B1 (fr) 1983-07-18

Family

ID=14928992

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7829987A Granted FR2406865A1 (fr) 1977-10-20 1978-10-20 Dispositif de lecture de l'information enregistree sur un support magnetique

Country Status (9)

Country Link
US (1) US4228473A (fr)
JP (1) JPS5459915A (fr)
AT (1) AT369914B (fr)
AU (1) AU522038B2 (fr)
CA (1) CA1132254A (fr)
DE (1) DE2845604A1 (fr)
FR (1) FR2406865A1 (fr)
GB (1) GB2019634B (fr)
NL (1) NL191661C (fr)

Families Citing this family (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5630442U (fr) * 1979-08-16 1981-03-24
JPS5635140U (fr) * 1979-08-24 1981-04-06
JPS5635141U (fr) * 1979-08-24 1981-04-06
US4467383A (en) * 1980-02-23 1984-08-21 Sharp Kabushiki Kaisha Magnetooptic memory medium
JPS57117142A (en) * 1981-01-11 1982-07-21 Victor Co Of Japan Ltd Magnetic tape reproducing system
DE3110572A1 (de) * 1981-03-18 1982-09-30 Agfa-Gevaert Ag, 5090 Leverkusen Magneto-optisches speicherverfahren
US4581717A (en) * 1981-03-26 1986-04-08 Sony Corporation Thermomagnetic recording method
JPS58165747U (ja) * 1982-04-28 1983-11-04 ティーディーケイ株式会社 磁気記録読出装置
US4562502A (en) * 1982-04-28 1985-12-31 Tdk Corporation Optical reproducing system
US4564877A (en) * 1982-04-28 1986-01-14 Tdk Corporation Magnetic recording/reproducing system with wide-gapped transducer and method for using same
US4476465A (en) * 1982-08-30 1984-10-09 Litton Systems, Inc. Magneto-optic display generator
US4646184A (en) * 1983-09-21 1987-02-24 Ye Data Inc. Magnetic head for recording and reproduction
JPS61139959A (ja) * 1984-12-12 1986-06-27 Canon Inc 磁気記録の再生方法
US4707755A (en) * 1985-03-20 1987-11-17 Hitachi, Ltd. Optical read-out magnetic head
US4654837A (en) * 1985-09-06 1987-03-31 Datatape Incorporated Magneto-optic transducer with enhanced signal performance
FR2601465B1 (fr) * 1986-07-11 1988-10-21 Bull Sa Dispositif modulateur haute frequence de polarisation de la lumiere
US5159511A (en) * 1987-04-01 1992-10-27 Digital Equipment Corporation Biasing conductor for MR head
IT1218657B (it) * 1987-05-21 1990-04-19 Olivetti & Co Spa Dispositivo di lettura di un supporto di registrazione di dati per effetto magneto-ottico su un raggio laser
US4931635A (en) * 1987-12-01 1990-06-05 Teijin Seiki Company Limited Optical position sensor using Faraday effect element and magnetic scale
US5085935A (en) * 1988-08-03 1992-02-04 Digital Equipment Corporation Flux spreading thin film magnetic devices
US5089334A (en) * 1988-08-03 1992-02-18 Digital Equipment Corporation Flux spreading thin film magnetic devices
CA1334447C (fr) * 1988-08-03 1995-02-14 Digital Equipment Corporation Anisotropie perpendiculaire dans les dispositifs en couches minces
CA2043995C (fr) * 1990-06-13 1997-06-24 Kenji Ohta Dispositif d'enregistrement-lecture magneto-optique
US5192862A (en) * 1991-12-19 1993-03-09 Simmonds Precision Products, Inc. Polarizerless magneto-optic speed and torque sensor
US5412469A (en) * 1992-11-16 1995-05-02 Simmonds Precision Products, Inc. Optical spectrum analyzer and encoder using a modulated phase grating wherein said grating diffracts the wavelength as a function of the magnetic field
US5461308A (en) * 1993-12-30 1995-10-24 At&T Ipm Corp. Magnetoresistive current sensor having high sensitivity
JP3177104B2 (ja) * 1994-09-16 2001-06-18 日本アイ・ビー・エム株式会社 フレア防止光学系、フレア防止方法、浮上量測定装置
US5889641A (en) * 1997-05-05 1999-03-30 Seagate Technology, Inc. Magneto-resistive magneto-optical head
FR2802696B1 (fr) * 1999-12-17 2002-07-19 Thomson Csf Lecteur magneto optique optimise par le polariseur de lumiere incidente
CN115291149B (zh) * 2022-10-08 2023-02-03 赫智科技(苏州)有限公司 线阵扫描装置及控制方法

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1248433A (en) * 1967-11-08 1971-10-06 Gen Electric Improvements in gapless magnetic transducers and apparatus utilizing the same
US3636535A (en) * 1969-12-10 1972-01-18 Magnavox Co Magneto-optical transducer
US3626394A (en) * 1970-04-09 1971-12-07 Magnavox Co Magneto-optical system
US3688282A (en) * 1970-10-16 1972-08-29 Gen Telephone & Elect Magneto-optical magnetic field polarity sensor
US3676867A (en) * 1970-12-07 1972-07-11 Bell Telephone Labor Inc USE OF MnAlGe IN MAGNETIC STORAGE DEVICES
NL7301931A (fr) * 1973-02-12 1974-08-14
CA1050862A (fr) * 1973-10-04 1979-03-20 Richard E. Novak Couches de grenat pour dispositifs a bulles magnetiques
US3859643A (en) * 1973-11-14 1975-01-07 Corning Glass Works Optical sensing of cylindrical magnetic domains
US4052748A (en) * 1974-04-01 1977-10-04 U.S. Philips Corporation Magnetoresistive magnetic head
NL7405727A (nl) * 1974-04-29 1975-10-31 Philips Nv Magnetoweerstandkop.
DE2435415A1 (de) * 1974-07-23 1976-02-05 Siemens Ag Anordnung zur direkten umwandlung magnetisch gespeicherter informationen in optische signale
DE2607585C3 (de) * 1975-03-03 1982-02-11 Naamloze Vennootschap Philips' Gloeilampenfabrieken, 5621 Eindhoven Magnetische Anordnung zum Übertragen von Daten in Form von longitudinalen Magnetisierungsmustern
NL7511483A (nl) * 1975-09-30 1977-04-01 Philips Nv Inrichting voor het uitlezen van magnetisatie- patronen.
JPS5250219A (en) * 1975-10-20 1977-04-22 Kokusai Denshin Denwa Co Ltd <Kdd> Magnetic recorded pattern reading device

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
EXBK/71 *
EXBK/73 *

Also Published As

Publication number Publication date
GB2019634A (en) 1979-10-31
AU522038B2 (en) 1982-05-13
ATA755978A (de) 1982-06-15
JPS5459915A (en) 1979-05-15
NL7810483A (nl) 1979-04-24
AT369914B (de) 1983-02-10
DE2845604C2 (fr) 1992-02-13
NL191661C (nl) 1995-12-02
DE2845604A1 (de) 1979-05-03
NL191661B (nl) 1995-08-01
FR2406865B1 (fr) 1983-07-18
US4228473A (en) 1980-10-14
GB2019634B (en) 1982-04-28
CA1132254A (fr) 1982-09-21
JPS6130331B2 (fr) 1986-07-12
AU4093478A (en) 1980-04-24

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