JPS59178602A - 光磁気記録装置 - Google Patents

光磁気記録装置

Info

Publication number
JPS59178602A
JPS59178602A JP5450983A JP5450983A JPS59178602A JP S59178602 A JPS59178602 A JP S59178602A JP 5450983 A JP5450983 A JP 5450983A JP 5450983 A JP5450983 A JP 5450983A JP S59178602 A JPS59178602 A JP S59178602A
Authority
JP
Japan
Prior art keywords
magnetic field
output
laser
tape
recording device
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
JP5450983A
Other languages
English (en)
Inventor
Shiro Okamura
岡村　史良
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to JP5450983A priority Critical patent/JPS59178602A/ja
Publication of JPS59178602A publication Critical patent/JPS59178602A/ja
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
    • G11B11/10595—Control of operating function
    • 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
    • G11B11/10502—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 characterised by the transducing operation to be executed
    • G11B11/10504—Recording
    • G11B11/10506—Recording by modulating only the light beam of the transducer
    • 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
    • G11B11/10502—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 characterised by the transducing operation to be executed
    • G11B11/10526—Bulk initialisation or erasing, e.g. at least one whole information track with a single action

Landscapes

  • Recording Or Reproducing By Magnetic Means (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。

Description

【発明の詳細な説明】 この発明は特にレーザを用いた高密度光磁気記録装置に
かかる。
磁性媒体を先ず一方向に磁化しておいて、信号で変調さ
れたレーザ光を当て、その部に前記と逆方向の磁界をか
けると強く信号が記録されることを発明者出願特願昭５
８−２５３８８号明細書に示した。
レーザ特に半導体レーザは使用中に出力が減退し、レー
ザ変換時の出力も変化する。
」−記述方向磁界は研究の結果レーザ出力が減少した時
は磁界を増加すれば同様に記録が行なわれることが判っ
た。同様にレーザ出力が増大した時は磁界を減ず。この
よろな自動調節系を用いれば長期間安定に記録再生がで
きる。
第１図は本発明実施例を示す。Ｉは移動する磁性媒体例
えばＣｒＯ２テープで、先ず磁石２によって十分一方向
に磁化しておいて、信号３で変調されたレーザ４のビー
ム１３で照射しつつ、電磁石６で通磁Ｗを加える。一方
、ホトトランジスタ等の光センサ８の出力で制御される
調節器７によって６の電流が制御されそのレーザ出力に
対応した最適磁界を与える。もちろんレーザ出力は信号
によって変動するから、８の出力は適当な時定数処理す
る。更にモニタ再生ヘッド２０の再生出力が最大になる
よう７を制御してもよい。
第２図は本発明の原理を示す。横軸は第１図８なるセン
サ出力で、縦軸の曲線１２は電磁石６の磁界強度を示す
。図のようｔこ出力が減れば磁界を増加する。
第３図は第１図の変形を示す。逆方向磁界を与えるのは
永久磁石６であって、６は移動装置１０例えばスピーカ
駆動系で磁性媒体への距離が不変であり、１０はやはり
光センサ８て制御され、第２図のような特性を与える。
本発明は任意の磁性体例えばディスクやドラムなどにも
適用できることは明らかである。
本発明の磁界調節手段はアナログ、ディジモル何れの場
合も用いられるが、アナログの場合子を最小にするよう
調節することは容易である。
本発明は上記特定例に限らず、種々の変形ができる。
【図面の簡単な説明】
第１図は本発明による光磁気記録装置を示す。 第２図は本発明の原理説明図である。第３図は第１図の
変形である。 ’Ｉｔ　（ｒ？ ８−−

Claims (1)

    【特許請求の範囲】
  1. 磁性媒体を一方向に磁化する手段と、磁化された磁性媒
    体を部分的に加熱する加熱手段と、該加熱手段に係合し
    て前記磁性体を前記一方向と逆方向に磁化する手段と、
    該加熱手段に係合してその出力に応し該逆磁化手段を変
    化させる制御手段とを備えた光磁気記録装置。
JP5450983A 1983-03-30 1983-03-30 光磁気記録装置 Pending JPS59178602A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5450983A JPS59178602A (ja) 1983-03-30 1983-03-30 光磁気記録装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5450983A JPS59178602A (ja) 1983-03-30 1983-03-30 光磁気記録装置

Publications (1)

Publication Number Publication Date
JPS59178602A true JPS59178602A (ja) 1984-10-09

Family

ID=12972605

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5450983A Pending JPS59178602A (ja) 1983-03-30 1983-03-30 光磁気記録装置

Country Status (1)

Country Link
JP (1) JPS59178602A (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4862437A (en) * 1984-10-26 1989-08-29 Nec Corporation Magneto-optical recording reproducing, and erasing apparatus having two independent magnetic field applying devices
EP0657878A2 (en) * 1993-12-08 1995-06-14 Mitsubishi Chemical Corporation Magneto-optical recording and reading-out method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4862437A (en) * 1984-10-26 1989-08-29 Nec Corporation Magneto-optical recording reproducing, and erasing apparatus having two independent magnetic field applying devices
EP0657878A2 (en) * 1993-12-08 1995-06-14 Mitsubishi Chemical Corporation Magneto-optical recording and reading-out method
EP0657878A3 (en) * 1993-12-08 1995-08-30 Mitsubishi Chem Corp Magneto-optical recording and reading process.
US5535180A (en) * 1993-12-08 1996-07-09 Mitsubishi Chemical Corporation Magneto-optical tape recording and reading-out method involving running tape in front of at least a single pole of a magnet to initialize or erase information

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