JPS56117345A - Optical recording medium - Google Patents

Optical recording medium

Info

Publication number
JPS56117345A
JPS56117345A JP2041880A JP2041880A JPS56117345A JP S56117345 A JPS56117345 A JP S56117345A JP 2041880 A JP2041880 A JP 2041880A JP 2041880 A JP2041880 A JP 2041880A JP S56117345 A JPS56117345 A JP S56117345A
Authority
JP
Japan
Prior art keywords
light
magnetic
film
specific wavelength
magnetic layer
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
JP2041880A
Other languages
Japanese (ja)
Other versions
JPS627611B2 (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 JP2041880A priority Critical patent/JPS56117345A/en
Publication of JPS56117345A publication Critical patent/JPS56117345A/en
Publication of JPS627611B2 publication Critical patent/JPS627611B2/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

Abstract

PURPOSE:To enable high-density recording by improving the utilization efficiency of light and reliability, by arranging an information storage magnetic medium on a transparent thin magnetic film closely or in contact with an interposing film which transmits light of the 1st specific wavelength and reflects light of the 2nd specific wavelength. CONSTITUTION:While magnetic head 27 applies magnetic layer 22 with a magnetic field which is constant or variable in both intensity and direction, the surface of magnetic layer 22 is irradiated with laser light 29 via condenser lens 28. Since thin magnetic film 23 and multilayer film 25 transmit light of specific wavelength lambda1, the light of irradiation is used efficiently to heat magnetic layer 2. On the other hand, information thus recorded on magnetic layer 22 is transferred to thin magnetic film 23. A magnetized pattern formed on thin magnetic film 23 can be read out with laser beam 29 of specific wavelength lambda2 by making use of the Faraday effect, and at this time, multilayer film 25 serves as a reflex mirror high in reflection factor for readout light 29.
JP2041880A 1980-02-22 1980-02-22 Optical recording medium Granted JPS56117345A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2041880A JPS56117345A (en) 1980-02-22 1980-02-22 Optical recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2041880A JPS56117345A (en) 1980-02-22 1980-02-22 Optical recording medium

Publications (2)

Publication Number Publication Date
JPS56117345A true JPS56117345A (en) 1981-09-14
JPS627611B2 JPS627611B2 (en) 1987-02-18

Family

ID=12026479

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2041880A Granted JPS56117345A (en) 1980-02-22 1980-02-22 Optical recording medium

Country Status (1)

Country Link
JP (1) JPS56117345A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58153244A (en) * 1982-03-05 1983-09-12 Matsushita Electric Ind Co Ltd Photomagnetic recording medium
WO1984002603A1 (en) * 1982-12-23 1984-07-05 Sony Corp Thermomagnetic optical recording/reproducing method
JPH03198242A (en) * 1990-05-30 1991-08-29 Sharp Corp Magneto-optical recording and reproducing device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58153244A (en) * 1982-03-05 1983-09-12 Matsushita Electric Ind Co Ltd Photomagnetic recording medium
WO1984002603A1 (en) * 1982-12-23 1984-07-05 Sony Corp Thermomagnetic optical recording/reproducing method
JPH03198242A (en) * 1990-05-30 1991-08-29 Sharp Corp Magneto-optical recording and reproducing device
JPH0512780B2 (en) * 1990-05-30 1993-02-18 Sharp Kk

Also Published As

Publication number Publication date
JPS627611B2 (en) 1987-02-18

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