JPS6439651A - Recording and reproducing device for magneto-optical disk - Google Patents

Recording and reproducing device for magneto-optical disk

Info

Publication number
JPS6439651A
JPS6439651A JP19682787A JP19682787A JPS6439651A JP S6439651 A JPS6439651 A JP S6439651A JP 19682787 A JP19682787 A JP 19682787A JP 19682787 A JP19682787 A JP 19682787A JP S6439651 A JPS6439651 A JP S6439651A
Authority
JP
Japan
Prior art keywords
disk
output
magneto
rotating speed
erasure
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
JP19682787A
Other languages
Japanese (ja)
Inventor
Takeo Tanaka
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 JP19682787A priority Critical patent/JPS6439651A/en
Publication of JPS6439651A publication Critical patent/JPS6439651A/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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B19/04—Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • G11B19/28—Speed controlling, regulating, or indicating

Abstract

PURPOSE:To simplify the structure of the whole of device, by setting the driving rotating speed of a magneto-optical disk in an erasure operation at linear velocity almost being approximated to the rotating speed of the magneto-optical disk whose maximum value is limited by the plane power of a magneto-optical head and a desired erasure ratio. CONSTITUTION:By setting a mode changeover switch 143 at an erasing state, the magneto-optical head 120 is connected to an erasure circuit 142, and the driving system of a motor 110 is switched, and the rotation of the disk 100 is operated by frequency generating output and the output of a position sensor 130. The rotating speed of the disk 100 at the laser beam position of the head 120 is compared with the output of a reference signal generator 112, and is controlled with a driving circuit 111 so as to be always actual linear velocity. Since the output of the generator 112 in such case is set corresponding to the outermost linear velocity of the disk 100, the rotating speed of the disk 100 can be increased as in the inner periphery of the laser beam position, therefore, the output level of the erasure circuit 142 can keep the output of 1.1 times the peak output of the disk 100 at the time of recording the outermost periphery.
JP19682787A 1987-08-05 1987-08-05 Recording and reproducing device for magneto-optical disk Pending JPS6439651A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19682787A JPS6439651A (en) 1987-08-05 1987-08-05 Recording and reproducing device for magneto-optical disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19682787A JPS6439651A (en) 1987-08-05 1987-08-05 Recording and reproducing device for magneto-optical disk

Publications (1)

Publication Number Publication Date
JPS6439651A true JPS6439651A (en) 1989-02-09

Family

ID=16364323

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19682787A Pending JPS6439651A (en) 1987-08-05 1987-08-05 Recording and reproducing device for magneto-optical disk

Country Status (1)

Country Link
JP (1) JPS6439651A (en)

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