JPS6464153A - Overwritable magneto-optical recording and reproducing device - Google Patents

Overwritable magneto-optical recording and reproducing device

Info

Publication number
JPS6464153A
JPS6464153A JP62220926A JP22092687A JPS6464153A JP S6464153 A JPS6464153 A JP S6464153A JP 62220926 A JP62220926 A JP 62220926A JP 22092687 A JP22092687 A JP 22092687A JP S6464153 A JPS6464153 A JP S6464153A
Authority
JP
Japan
Prior art keywords
magnetic field
auxiliary magnetic
medium
information
initial auxiliary
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
JP62220926A
Other languages
Japanese (ja)
Other versions
JPH0816995B2 (en
Inventor
Hiroyuki Matsumoto
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.)
Nikon Corp
Original Assignee
Nikon 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 Nikon Corp filed Critical Nikon Corp
Priority to JP62220926A priority Critical patent/JPH0816995B2/en
Publication of JPS6464153A publication Critical patent/JPS6464153A/en
Publication of JPH0816995B2 publication Critical patent/JPH0816995B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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

Landscapes

  • Recording Or Reproducing By Magnetic Means (AREA)

Abstract

PURPOSE:To eliminate the dissipation of recorded information and the increase of a noise, by providing a control means for controlling the strength of an initial auxiliary magnetic field, on the device. CONSTITUTION:By a rotating means 21, a recording medium 20 is moved at constant speed. To its medium 20, a laser beam is projected by a laser beam light source 23. This beam is modulated pulsatively in accordance with information by a control means 24. In this case, a control means 32 is not operated, and an initial auxiliary magnetic field is applied to the medium 20 by an initial auxiliary magnetic field applying means 22. As a result, a signal is recorded. In that state, it is reproduced by operating the means 32 and setting the initial auxiliary magnetic field to '0'. Subsequently, new information is overwritten to an already recorded area of the medium 20. When this information is reproduced in the same way, new information is reproduced, and no error is generated. According to this constitution, an unnecessary initial auxiliary magnetic field applied to the medium 20 can be eliminated substantially, and it does not occur that recorded information dissipates, and a noise increases.
JP62220926A 1987-09-03 1987-09-03 Overwritable magneto-optical recording / reproducing device Expired - Lifetime JPH0816995B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62220926A JPH0816995B2 (en) 1987-09-03 1987-09-03 Overwritable magneto-optical recording / reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62220926A JPH0816995B2 (en) 1987-09-03 1987-09-03 Overwritable magneto-optical recording / reproducing device

Publications (2)

Publication Number Publication Date
JPS6464153A true JPS6464153A (en) 1989-03-10
JPH0816995B2 JPH0816995B2 (en) 1996-02-21

Family

ID=16758718

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62220926A Expired - Lifetime JPH0816995B2 (en) 1987-09-03 1987-09-03 Overwritable magneto-optical recording / reproducing device

Country Status (1)

Country Link
JP (1) JPH0816995B2 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61187141A (en) * 1985-02-14 1986-08-20 Nec Corp Photomagnetic recording system
JPS62175948A (en) * 1985-06-11 1987-08-01 Nippon Kogaku Kk <Nikon> Overwritable photomagnetic recording method and photomagnetic recording device and medium therefor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61187141A (en) * 1985-02-14 1986-08-20 Nec Corp Photomagnetic recording system
JPS62175948A (en) * 1985-06-11 1987-08-01 Nippon Kogaku Kk <Nikon> Overwritable photomagnetic recording method and photomagnetic recording device and medium therefor

Also Published As

Publication number Publication date
JPH0816995B2 (en) 1996-02-21

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