JPS5760504A - Photomagnetic recorder - Google Patents

Photomagnetic recorder

Info

Publication number
JPS5760504A
JPS5760504A JP13510180A JP13510180A JPS5760504A JP S5760504 A JPS5760504 A JP S5760504A JP 13510180 A JP13510180 A JP 13510180A JP 13510180 A JP13510180 A JP 13510180A JP S5760504 A JPS5760504 A JP S5760504A
Authority
JP
Japan
Prior art keywords
light
magnetic
radiated
recording medium
polarized light
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
JP13510180A
Other languages
Japanese (ja)
Inventor
Takahiko Tamaki
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 JP13510180A priority Critical patent/JPS5760504A/en
Publication of JPS5760504A publication Critical patent/JPS5760504A/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
    • G11B11/10532—Heads
    • G11B11/10534—Heads for recording by magnetising, demagnetising or transfer of magnetisation, by radiation, e.g. for thermomagnetic recording
    • G11B11/10539—Heads for recording by magnetising, demagnetising or transfer of magnetisation, by radiation, e.g. for thermomagnetic recording using electromagnetic beams, e.g. polarised light
    • 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
    • G11B11/10534—Heads for recording by magnetising, demagnetising or transfer of magnetisation, by radiation, e.g. for thermomagnetic recording

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)

Abstract

PURPOSE:To enable photomagnetic recording with high speed and density without strong energized light, by heating only a minute area on a magnetic recording medium with heat of light and making magnetic write-in with a photo induced magnetized crystal head producing quick magnetization. CONSTITUTION:A coherent light A radiated from an energizing laser 1 is converged with a lens 2 and a straight line polarized light B through a polarizer 3. A photomodulator 4 modulates the light B into a left/right circular polarized light C according to the voltage of a modulation signal source 5. The light C is radiated on a photo induced magnetized crystal head 6 to energize magnetic ions in the crystal, allowing to produce negative (positive) magnetization according to the polarized angle of the right (left) circular polarized light C from the energized part and to induce a magnetic field H externally. Further, the light C passes through the head 6 to cause magnetic inversion on a magnetic recording medium 7 locally heated as a heated light D as shown in the arrow for magnetic write-in.
JP13510180A 1980-09-30 1980-09-30 Photomagnetic recorder Pending JPS5760504A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13510180A JPS5760504A (en) 1980-09-30 1980-09-30 Photomagnetic recorder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13510180A JPS5760504A (en) 1980-09-30 1980-09-30 Photomagnetic recorder

Publications (1)

Publication Number Publication Date
JPS5760504A true JPS5760504A (en) 1982-04-12

Family

ID=15143856

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13510180A Pending JPS5760504A (en) 1980-09-30 1980-09-30 Photomagnetic recorder

Country Status (1)

Country Link
JP (1) JPS5760504A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58108007A (en) * 1981-12-22 1983-06-28 Fujitsu Ltd Optomagnetic recording method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5197414A (en) * 1975-02-22 1976-08-27
JPS54146619A (en) * 1978-05-09 1979-11-16 Nippon Hoso Kyokai <Nhk> Photo-magnetic transducer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5197414A (en) * 1975-02-22 1976-08-27
JPS54146619A (en) * 1978-05-09 1979-11-16 Nippon Hoso Kyokai <Nhk> Photo-magnetic transducer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58108007A (en) * 1981-12-22 1983-06-28 Fujitsu Ltd Optomagnetic recording method
JPH0213361B2 (en) * 1981-12-22 1990-04-04 Fujitsu Ltd

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