JPS57195303A - Vertical thermomagnetic recording method - Google Patents

Vertical thermomagnetic recording method

Info

Publication number
JPS57195303A
JPS57195303A JP7785081A JP7785081A JPS57195303A JP S57195303 A JPS57195303 A JP S57195303A JP 7785081 A JP7785081 A JP 7785081A JP 7785081 A JP7785081 A JP 7785081A JP S57195303 A JPS57195303 A JP S57195303A
Authority
JP
Japan
Prior art keywords
spot
heat
information
crescent
rays
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.)
Pending
Application number
JP7785081A
Other languages
Japanese (ja)
Inventor
Motoharu Tanaka
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP7785081A priority Critical patent/JPS57195303A/en
Publication of JPS57195303A publication Critical patent/JPS57195303A/en
Pending 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 realize a fine recording pattern and to improve recording density by shaping a circular spot of rays of heat into a crescent and then irradiating a vertical magnetic recording medium with it by a device which writes information by utilizing the Curie point of the medium. CONSTITUTION:A circular spot of rays of heat from a heat-ray source 11 is modulated by a modulator 12 by using a signal which corresponds to information to be recorded, and shaped into a crescent or half-moon spot by a filter 13 in a prescribed shape; and the spot enters a condenser lens system 15 through a reflecting mirror 14 to be condensed into a fine spot, with which a vertical magnetic recording medium 16 is irradiated. Since the irradiation part is heated approximately up to the Curie point, its coercive force is reduced and the magnetism is inverted in the direction of a bias magnetic field 17, writing the information in the same shape with the filter.
JP7785081A 1981-05-22 1981-05-22 Vertical thermomagnetic recording method Pending JPS57195303A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7785081A JPS57195303A (en) 1981-05-22 1981-05-22 Vertical thermomagnetic recording method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7785081A JPS57195303A (en) 1981-05-22 1981-05-22 Vertical thermomagnetic recording method

Publications (1)

Publication Number Publication Date
JPS57195303A true JPS57195303A (en) 1982-12-01

Family

ID=13645527

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7785081A Pending JPS57195303A (en) 1981-05-22 1981-05-22 Vertical thermomagnetic recording method

Country Status (1)

Country Link
JP (1) JPS57195303A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59142761A (en) * 1983-02-01 1984-08-16 Seiko Epson Corp Optical head for opto-magnetic reproduction
EP0481786A2 (en) * 1990-10-19 1992-04-22 Canon Kabushiki Kaisha Magneto-optical recording method
US5287334A (en) * 1989-07-29 1994-02-15 Sony Corporation Magneto-optical pickup apparatus and magneto-optical recording/reproducing apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59142761A (en) * 1983-02-01 1984-08-16 Seiko Epson Corp Optical head for opto-magnetic reproduction
US5287334A (en) * 1989-07-29 1994-02-15 Sony Corporation Magneto-optical pickup apparatus and magneto-optical recording/reproducing apparatus
EP0481786A2 (en) * 1990-10-19 1992-04-22 Canon Kabushiki Kaisha Magneto-optical recording method

Similar Documents

Publication Publication Date Title
JPS5778652A (en) Thermal magnetic recording carrier and thermal magnetic recording system
JPS5794906A (en) Optical magnetic recorder
EP0399978A3 (en) Method and apparatus for overwriting data on a magneto-optic disk
JPS5674843A (en) Photomagnetic recording medium
JPS5792446A (en) Recording, reproduction and erasure system for information using photomagnetic recording medium
JPS5769541A (en) Recording medium and recording and reproducing system using sand medium
EP0392020A4 (en) Magnetooptical recording apparatus
ATE29078T1 (en) MAGNETO-OPTIC DEVICE.
JPS57195303A (en) Vertical thermomagnetic recording method
JPS5661032A (en) Optical magnetic recording medium
JPS56153546A (en) Magnetic recording medium
JPH0341906B2 (en)
JPS5794948A (en) Photomagnetic recording medium
EP0330507A3 (en) Magneto-optic recording and regenerating process, device using same and magneto-optic disk
JPS55129908A (en) Thermomagnetic recording and reproducing device
JPS57186248A (en) Vertically thermomagnetic recording and reproducing system
JPS5616917A (en) Thermal and magnetic recorder
JPS56143547A (en) Magnetooptical storage disk
JPS605404A (en) Opto-magnetic recording and reproducing system
JPS61229247A (en) Photomagnetic medium
JPS59117703A (en) Photomagnetic disc device
JPS6010401A (en) Optical magnetic disc device
CA2081153A1 (en) Magneto-optical memory device whereon overwriting operation can be carried out through light intensity modulation and method for recording and erasing using it
JPS57105827A (en) Manufacture of recorded medium
JPS57189362A (en) Magnetic recording and reproducing device