JPS55122244A - Photomagnetic recording and reproducing method - Google Patents

Photomagnetic recording and reproducing method

Info

Publication number
JPS55122244A
JPS55122244A JP2557079A JP2557079A JPS55122244A JP S55122244 A JPS55122244 A JP S55122244A JP 2557079 A JP2557079 A JP 2557079A JP 2557079 A JP2557079 A JP 2557079A JP S55122244 A JPS55122244 A JP S55122244A
Authority
JP
Japan
Prior art keywords
magnetic
thin film
light beam
powder coating
coercive force
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
JP2557079A
Other languages
Japanese (ja)
Other versions
JPS5923014B2 (en
Inventor
Tatsuo Nomura
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.)
Japan Broadcasting Corp
Original Assignee
Nippon Hoso Kyokai NHK
Japan Broadcasting 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 Nippon Hoso Kyokai NHK, Japan Broadcasting Corp filed Critical Nippon Hoso Kyokai NHK
Priority to JP2557079A priority Critical patent/JPS5923014B2/en
Publication of JPS55122244A publication Critical patent/JPS55122244A/en
Publication of JPS5923014B2 publication Critical patent/JPS5923014B2/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

Abstract

PURPOSE:To make high-density recording possible interposing a metallic thin film between a high-coercive force magnetic powder coating magnetic layer and a low- coercive force magnetic thin film to prevent the light beam, which is transmitted through the magnetic thin film, from reaching the magnetic powder coating layer. CONSTITUTION:Incident laser light beam 3 raises rapidly the temperature of magnetic thin film 6 and a minute section of metallic thin film 8, which is caused to adhere to thin film 6 closely, locally, and the temperature of a minute section of magnetic powder coating magnetic layer 2 which is caused to adhere to metallic thin film 8 closely rises due to heat conduction from the heated section above. Since magnetic layer 2 consists of a high-coercive force magnetic material which can be magnetized easily even in a comparatively weak magnetic field due to this temperature rise, high-density photomagnetic recording of information signals dependent upon modulation of applied magnetic field intensity or incident light intensity can be performed in a minute section of the same dimension as the converged spot diameter of laser light beam 3 in the manetic field dependent upon magnetic head 4.
JP2557079A 1979-03-07 1979-03-07 Magneto-optical recording and reproducing method Expired JPS5923014B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2557079A JPS5923014B2 (en) 1979-03-07 1979-03-07 Magneto-optical recording and reproducing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2557079A JPS5923014B2 (en) 1979-03-07 1979-03-07 Magneto-optical recording and reproducing method

Publications (2)

Publication Number Publication Date
JPS55122244A true JPS55122244A (en) 1980-09-19
JPS5923014B2 JPS5923014B2 (en) 1984-05-30

Family

ID=12169581

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2557079A Expired JPS5923014B2 (en) 1979-03-07 1979-03-07 Magneto-optical recording and reproducing method

Country Status (1)

Country Link
JP (1) JPS5923014B2 (en)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5778652A (en) * 1980-11-01 1982-05-17 Daido Steel Co Ltd Thermal magnetic recording carrier and thermal magnetic recording system
JPS5843078A (en) * 1981-09-08 1983-03-12 Omron Tateisi Electronics Co Memory card
JPS5844586A (en) * 1981-09-09 1983-03-15 Omron Tateisi Electronics Co Magnetic card device
JPS5857646A (en) * 1981-10-01 1983-04-05 Akai Electric Co Ltd Vertical magnetic recording and reproducing method
JPS5883346A (en) * 1981-11-10 1983-05-19 Kokusai Denshin Denwa Co Ltd <Kdd> Photomagnetic recording medium
JPS6129438A (en) * 1984-07-19 1986-02-10 Sony Corp Magnetic recorded light reproducer
JPS63117354A (en) * 1986-11-05 1988-05-21 Canon Inc Magneto-optical recording medium
EP0383526A2 (en) * 1989-02-16 1990-08-22 Minnesota Mining And Manufacturing Company Magneto-optic recording system
WO1991011806A1 (en) * 1990-01-31 1991-08-08 Sony Corporation Magneto-optical recording/reproducing apparatus
WO1991011807A1 (en) * 1990-01-31 1991-08-08 Sony Corporation Optical disc system and optical disc
JPH03198242A (en) * 1990-05-30 1991-08-29 Sharp Corp Magneto-optical recording and reproducing device
US5105408A (en) * 1988-05-12 1992-04-14 Digital Equipment Corporation Optical head with flying lens
US5124961A (en) * 1989-12-28 1992-06-23 Fuji Xerox Co., Ltd. Floating head for use with a recording apparatus of magneto-optical memory device
US5161134A (en) * 1989-06-29 1992-11-03 Digital Equipment Corporation Method for increasing linear bit density in magneto-optical storage media
US5197050A (en) * 1989-10-06 1993-03-23 Fuji Xerox Co., Ltd. Flying head for a magneto-optical recording drive
US5287334A (en) * 1989-07-29 1994-02-15 Sony Corporation Magneto-optical pickup apparatus and magneto-optical recording/reproducing apparatus
US5392263A (en) * 1990-01-31 1995-02-21 Sony Corporation Magneto-optical disk system with specified thickness for protective layer on the disk relative to the numerical aperture of the objective lens
JPH08212616A (en) * 1995-10-25 1996-08-20 Sony Corp Magnetic recording optical reproducing device
US5910932A (en) * 1991-09-11 1999-06-08 Sony Corporation Optical disk and optical disk system with numerical aperture of objective lens related to protective layer thickness of optical disk

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0235371B2 (en) * 1980-11-01 1990-08-09 Daido Tokushuko Kk
JPS5778652A (en) * 1980-11-01 1982-05-17 Daido Steel Co Ltd Thermal magnetic recording carrier and thermal magnetic recording system
JPS5843078A (en) * 1981-09-08 1983-03-12 Omron Tateisi Electronics Co Memory card
JPS5844586A (en) * 1981-09-09 1983-03-15 Omron Tateisi Electronics Co Magnetic card device
JPS5857646A (en) * 1981-10-01 1983-04-05 Akai Electric Co Ltd Vertical magnetic recording and reproducing method
JPS6227459B2 (en) * 1981-11-10 1987-06-15 Kokusai Denshin Denwa Co Ltd
JPS5883346A (en) * 1981-11-10 1983-05-19 Kokusai Denshin Denwa Co Ltd <Kdd> Photomagnetic recording medium
JPS6129438A (en) * 1984-07-19 1986-02-10 Sony Corp Magnetic recorded light reproducer
JPH0513337B2 (en) * 1984-07-19 1993-02-22 Sony Corp
JPS63117354A (en) * 1986-11-05 1988-05-21 Canon Inc Magneto-optical recording medium
JPH0522300B2 (en) * 1986-11-05 1993-03-29 Canon Kk
US5105408A (en) * 1988-05-12 1992-04-14 Digital Equipment Corporation Optical head with flying lens
EP0383526A2 (en) * 1989-02-16 1990-08-22 Minnesota Mining And Manufacturing Company Magneto-optic recording system
US5161134A (en) * 1989-06-29 1992-11-03 Digital Equipment Corporation Method for increasing linear bit density in magneto-optical storage media
US5287334A (en) * 1989-07-29 1994-02-15 Sony Corporation Magneto-optical pickup apparatus and magneto-optical recording/reproducing apparatus
US5197050A (en) * 1989-10-06 1993-03-23 Fuji Xerox Co., Ltd. Flying head for a magneto-optical recording drive
US5124961A (en) * 1989-12-28 1992-06-23 Fuji Xerox Co., Ltd. Floating head for use with a recording apparatus of magneto-optical memory device
WO1991011807A1 (en) * 1990-01-31 1991-08-08 Sony Corporation Optical disc system and optical disc
WO1991011806A1 (en) * 1990-01-31 1991-08-08 Sony Corporation Magneto-optical recording/reproducing apparatus
US5392263A (en) * 1990-01-31 1995-02-21 Sony Corporation Magneto-optical disk system with specified thickness for protective layer on the disk relative to the numerical aperture of the objective lens
USRE37428E1 (en) 1990-01-31 2001-10-30 Sony Corporation Magneto-optical disk system with specified thickness for protective layer on the disk relative to the numerical aperture of the objective lens
JPH0512780B2 (en) * 1990-05-30 1993-02-18 Sharp Kk
JPH03198242A (en) * 1990-05-30 1991-08-29 Sharp Corp Magneto-optical recording and reproducing device
US5910932A (en) * 1991-09-11 1999-06-08 Sony Corporation Optical disk and optical disk system with numerical aperture of objective lens related to protective layer thickness of optical disk
JPH08212616A (en) * 1995-10-25 1996-08-20 Sony Corp Magnetic recording optical reproducing device

Also Published As

Publication number Publication date
JPS5923014B2 (en) 1984-05-30

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