JPS6449147A - Magneto-optical/thermomagnetic disk recording device - Google Patents

Magneto-optical/thermomagnetic disk recording device

Info

Publication number
JPS6449147A
JPS6449147A JP62205759A JP20575987A JPS6449147A JP S6449147 A JPS6449147 A JP S6449147A JP 62205759 A JP62205759 A JP 62205759A JP 20575987 A JP20575987 A JP 20575987A JP S6449147 A JPS6449147 A JP S6449147A
Authority
JP
Japan
Prior art keywords
peak
magneto
optical
follower
laser
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
JP62205759A
Other languages
Japanese (ja)
Other versions
JPH0795378B2 (en
Inventor
Naohiro Tomikawa
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP62205759A priority Critical patent/JPH0795378B2/en
Publication of JPS6449147A publication Critical patent/JPS6449147A/en
Publication of JPH0795378B2 publication Critical patent/JPH0795378B2/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)
  • Optical Head (AREA)

Abstract

PURPOSE:To independently finding out the maximum condition of a C/N and the minimum condition of the even-order distortion and to attain highly reliable recording of magneto-optical reproducing signal by independently controlling the peak power and bottom power of a laser at the time of magneto-optical/ thermomagnetic recording. CONSTITUTION:A laser driving circuit 11 drives a laser 12 on the basis of a modulation input 10 and a diode 13 monitors the output of the laser 12 and inputs the monitored output to a peak follower 15 and a bottom follower 16 through an I/V converter 14. Then, a peak current control signal is found out from the output of the peak follower 15 and a peak setting voltage 17, a bottom current control signal 20 is obtained from the output of the bottom follower 16 and a bottom setting voltage 18 and these signals are supplied to a peak limitter and a bottom limitter in the circuit 11. Thus, the maximum condition of the carrier-to-noise rate and the minimum condition of the even-numbered distortion are independently found out and highly reliable magneto-optical reproduced signal recording can be attained.
JP62205759A 1987-08-19 1987-08-19 Optical / thermomagnetic disk recorder Expired - Lifetime JPH0795378B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62205759A JPH0795378B2 (en) 1987-08-19 1987-08-19 Optical / thermomagnetic disk recorder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62205759A JPH0795378B2 (en) 1987-08-19 1987-08-19 Optical / thermomagnetic disk recorder

Publications (2)

Publication Number Publication Date
JPS6449147A true JPS6449147A (en) 1989-02-23
JPH0795378B2 JPH0795378B2 (en) 1995-10-11

Family

ID=16512194

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62205759A Expired - Lifetime JPH0795378B2 (en) 1987-08-19 1987-08-19 Optical / thermomagnetic disk recorder

Country Status (1)

Country Link
JP (1) JPH0795378B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0329128A (en) * 1989-03-03 1991-02-07 Mansei Kogyo Kk Optical information recording method
JPH03156750A (en) * 1989-11-14 1991-07-04 Mitsubishi Electric Corp Magneto-optical recorder
JPH0411334A (en) * 1990-04-27 1992-01-16 Ricoh Co Ltd Optical information recording and reproducing device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0329128A (en) * 1989-03-03 1991-02-07 Mansei Kogyo Kk Optical information recording method
JPH03156750A (en) * 1989-11-14 1991-07-04 Mitsubishi Electric Corp Magneto-optical recorder
JPH0411334A (en) * 1990-04-27 1992-01-16 Ricoh Co Ltd Optical information recording and reproducing device

Also Published As

Publication number Publication date
JPH0795378B2 (en) 1995-10-11

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Legal Events

Date Code Title Description
EXPY Cancellation because of completion of term