JPS5637839A - Magnetooptical reproducing device - Google Patents

Magnetooptical reproducing device

Info

Publication number
JPS5637839A
JPS5637839A JP11062479A JP11062479A JPS5637839A JP S5637839 A JPS5637839 A JP S5637839A JP 11062479 A JP11062479 A JP 11062479A JP 11062479 A JP11062479 A JP 11062479A JP S5637839 A JPS5637839 A JP S5637839A
Authority
JP
Japan
Prior art keywords
film
magnetic
medium
laser light
recording medium
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
JP11062479A
Other languages
Japanese (ja)
Other versions
JPH028380B2 (en
Inventor
Masanori Isshiki
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP11062479A priority Critical patent/JPS5637839A/en
Publication of JPS5637839A publication Critical patent/JPS5637839A/en
Publication of JPH028380B2 publication Critical patent/JPH028380B2/ja
Granted 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

Abstract

PURPOSE:To read a recording signal with high precision by interposing a magnetic thin film of high magnetic permeability between a magnetic recording medium and transcription film so that the film surface will nearly be at right angles to the magnetic recording medium. CONSTITUTION:On magnetic recording medium 11 running as shown in the arrow, transcription film 12, an amorphous film based on garnet, the Gd-Co system, etc., of resistance magnetic force providing the large magnetooptical effect, is provided. Between the surface of film 12 and medium 11, magnetic thin film 13 of high magnetic permeability such as ''Permalloy '' is arranged at right angles to the surface of medium 11 while facing to the running direction of medium 11 and it is supported by nonmagnetic holder 14. The film thickness of film 13 should be set less than the wavelength of a recording signal. Thus, laser light from laser light source 15 is film 12 by way of polarizer 16, half mirror 17 and lens system 18 and its reflected light is detected by photodetector 20 via analyzer 19. Consequently, reproduction resolution can be improved by eliminating the reading interference between adjacent bit signals without reference to the beam diameter of reading laser light.
JP11062479A 1979-08-30 1979-08-30 Magnetooptical reproducing device Granted JPS5637839A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11062479A JPS5637839A (en) 1979-08-30 1979-08-30 Magnetooptical reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11062479A JPS5637839A (en) 1979-08-30 1979-08-30 Magnetooptical reproducing device

Publications (2)

Publication Number Publication Date
JPS5637839A true JPS5637839A (en) 1981-04-11
JPH028380B2 JPH028380B2 (en) 1990-02-23

Family

ID=14540493

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11062479A Granted JPS5637839A (en) 1979-08-30 1979-08-30 Magnetooptical reproducing device

Country Status (1)

Country Link
JP (1) JPS5637839A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6139956A (en) * 1984-07-31 1986-02-26 Nippon Hoso Kyokai <Nhk> Magnetooptic head
JPS61184582U (en) * 1985-05-07 1986-11-18
US6396774B1 (en) 1998-10-28 2002-05-28 Fujitsu Limited Information reproducing device, information recording/reproducing head, and information reproducing method utilizing mono-magnetic domain structure

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6139956A (en) * 1984-07-31 1986-02-26 Nippon Hoso Kyokai <Nhk> Magnetooptic head
JPS61184582U (en) * 1985-05-07 1986-11-18
JPH0331268Y2 (en) * 1985-05-07 1991-07-02
US6396774B1 (en) 1998-10-28 2002-05-28 Fujitsu Limited Information reproducing device, information recording/reproducing head, and information reproducing method utilizing mono-magnetic domain structure

Also Published As

Publication number Publication date
JPH028380B2 (en) 1990-02-23

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