FR2406865A1 - Dispositif de lecture de l'information enregistree sur un support magnetique - Google Patents
Dispositif de lecture de l'information enregistree sur un support magnetiqueInfo
- 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
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)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (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.
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5630442U (fr) * | 1979-08-16 | 1981-03-24 | ||
JPS5635141U (fr) * | 1979-08-24 | 1981-04-06 | ||
JPS5635140U (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 |
CA1334447C (fr) * | 1988-08-03 | 1995-02-14 | Digital Equipment Corporation | Anisotropie perpendiculaire dans les dispositifs en couches minces |
US5089334A (en) * | 1988-08-03 | 1992-02-18 | Digital Equipment Corporation | Flux spreading thin film magnetic devices |
US5085935A (en) * | 1988-08-03 | 1992-02-04 | Digital Equipment Corporation | Flux spreading thin film magnetic devices |
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)
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 |
-
1977
- 1977-10-20 JP JP12619377A patent/JPS5459915A/ja active Granted
-
1978
- 1978-10-19 DE DE19782845604 patent/DE2845604A1/de active Granted
- 1978-10-19 NL NL7810483A patent/NL191661C/xx not_active IP Right Cessation
- 1978-10-19 CA CA313,796A patent/CA1132254A/fr not_active Expired
- 1978-10-19 US US05/952,663 patent/US4228473A/en not_active Expired - Lifetime
- 1978-10-19 GB GB7841226A patent/GB2019634B/en not_active Expired
- 1978-10-20 FR FR7829987A patent/FR2406865A1/fr active Granted
- 1978-10-20 AT AT0755978A patent/AT369914B/de not_active IP Right Cessation
- 1978-10-20 AU AU40934/78A patent/AU522038B2/en not_active Expired
Non-Patent Citations (2)
Title |
---|
EXBK/71 * |
EXBK/73 * |
Also Published As
Publication number | Publication date |
---|---|
JPS6130331B2 (fr) | 1986-07-12 |
US4228473A (en) | 1980-10-14 |
FR2406865B1 (fr) | 1983-07-18 |
AT369914B (de) | 1983-02-10 |
NL191661B (nl) | 1995-08-01 |
CA1132254A (fr) | 1982-09-21 |
NL191661C (nl) | 1995-12-02 |
JPS5459915A (en) | 1979-05-15 |
DE2845604C2 (fr) | 1992-02-13 |
AU4093478A (en) | 1980-04-24 |
DE2845604A1 (de) | 1979-05-03 |
GB2019634A (en) | 1979-10-31 |
NL7810483A (nl) | 1979-04-24 |
ATA755978A (de) | 1982-06-15 |
GB2019634B (en) | 1982-04-28 |
AU522038B2 (en) | 1982-05-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |