JPS57200913A - Erasing device for recording information - Google Patents

Erasing device for recording information

Info

Publication number
JPS57200913A
JPS57200913A JP8615581A JP8615581A JPS57200913A JP S57200913 A JPS57200913 A JP S57200913A JP 8615581 A JP8615581 A JP 8615581A JP 8615581 A JP8615581 A JP 8615581A JP S57200913 A JPS57200913 A JP S57200913A
Authority
JP
Japan
Prior art keywords
disk
permanent magnet
magnetic field
recording information
laser beam
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
JP8615581A
Other languages
Japanese (ja)
Inventor
Hideki Hatano
Takasumi Tajiri
Masaru Otaki
Shigeru Kato
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.)
Pioneer Corp
Original Assignee
Pioneer Corp
Pioneer Electronic 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 Pioneer Corp, Pioneer Electronic Corp filed Critical Pioneer Corp
Priority to JP8615581A priority Critical patent/JPS57200913A/en
Publication of JPS57200913A publication Critical patent/JPS57200913A/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
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G11B5/024—Erasing
    • 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 erase recording information by simple constitution without using a solenoid driving means, by allowing a magnetic field, which is applied perpendicularly to part of the vertically magnetized film of a recording medium by a permanent magnet and has prescribed intensity, to move over the whole of the vertically magnetized film. CONSTITUTION:A disk 1 rotated at a high speed by a motor M is irradiated with a laser beam, a coil for a magnetizing bias is provided right under it, and the laser beam is modulated according to a signal, thus recording information. For the erasure of a signal recorded on the disk, a magnetic field applying means 8 is provided, and an erasing magnetic field having prescribed intensity is produced between mutually facing projections 10a and 10b formed of a permanent magnet 9 and magnetic lengthwise members 10 and 11 at both ends of the permanent magnet 9 in the rotational center axis direction of the disk 1.
JP8615581A 1981-06-04 1981-06-04 Erasing device for recording information Pending JPS57200913A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8615581A JPS57200913A (en) 1981-06-04 1981-06-04 Erasing device for recording information

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8615581A JPS57200913A (en) 1981-06-04 1981-06-04 Erasing device for recording information

Publications (1)

Publication Number Publication Date
JPS57200913A true JPS57200913A (en) 1982-12-09

Family

ID=13878846

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8615581A Pending JPS57200913A (en) 1981-06-04 1981-06-04 Erasing device for recording information

Country Status (1)

Country Link
JP (1) JPS57200913A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5075407A (en) * 1973-11-06 1975-06-20

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5075407A (en) * 1973-11-06 1975-06-20

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