JPS5724047A - Recorder and reproducer - Google Patents

Recorder and reproducer

Info

Publication number
JPS5724047A
JPS5724047A JP9870880A JP9870880A JPS5724047A JP S5724047 A JPS5724047 A JP S5724047A JP 9870880 A JP9870880 A JP 9870880A JP 9870880 A JP9870880 A JP 9870880A JP S5724047 A JPS5724047 A JP S5724047A
Authority
JP
Japan
Prior art keywords
erased
film
erasion
rotated
moved
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
JP9870880A
Other languages
Japanese (ja)
Inventor
Hideji Kawabata
Akira Muto
Masahiro Orukawa
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP9870880A priority Critical patent/JPS5724047A/en
Priority to GB8121521A priority patent/GB2083677B/en
Priority to CA000381783A priority patent/CA1177577A/en
Publication of JPS5724047A publication Critical patent/JPS5724047A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/78—Television signal recording using magnetic recording
    • H04N5/782—Television signal recording using magnetic recording on tape
    • H04N5/7824—Television signal recording using magnetic recording on tape with rotating magnetic heads
    • H04N5/7826—Television signal recording using magnetic recording on tape with rotating magnetic heads involving helical scanning of the magnetic tape
    • H04N5/78263—Television signal recording using magnetic recording on tape with rotating magnetic heads involving helical scanning of the magnetic tape for recording on tracks inclined relative to the direction of movement of the tape
    • 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
    • G11B11/10517—Overwriting or 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
    • G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
    • G11B11/10586—Record carriers characterised by the selection of the material or by the structure or form characterised by the selection of the material
    • 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

Abstract

PURPOSE:To eliminate a power source for coil, by distributing a permanent magnet that can be moved or rotated and a light converging lens to make them opposite to each other with respect to on a magnetic thin film. CONSTITUTION:The following devices are used: a light source 3, a light converging lens 4, a focus control coil 5 which moves the lens 4 to adjust its focus, a recording medium base 6, a magnetic thin film 7, a miniature permanent magnet bar 8, and a motor 9 respectively. The laser beam is irradiated at the area of the film 7 to be erased to heat it up, and thus the temperature at the part to be erased is increased higher than the Curie point. At the same time, the magnet bar 8 is moved or rotated to set the size of the magnetic field at the part to be erased larger than the critical erasion magnetic field and less than the coersive force of the film 7 and in the direction adverse to that of the recording mode. In such way, when the temperature reduces at the part to be erased, the direction of magnetization at that part is reversed and fixed. Thus erasion of recording is possible.
JP9870880A 1980-07-16 1980-07-21 Recorder and reproducer Pending JPS5724047A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP9870880A JPS5724047A (en) 1980-07-21 1980-07-21 Recorder and reproducer
GB8121521A GB2083677B (en) 1980-07-16 1981-07-13 Magnetooptical recording medium and a magnetooptical recording-and reeproducing device
CA000381783A CA1177577A (en) 1980-07-16 1981-07-15 Magnetooptical recording medium and recording-and- reproducing device using the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9870880A JPS5724047A (en) 1980-07-21 1980-07-21 Recorder and reproducer

Publications (1)

Publication Number Publication Date
JPS5724047A true JPS5724047A (en) 1982-02-08

Family

ID=14227004

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9870880A Pending JPS5724047A (en) 1980-07-16 1980-07-21 Recorder and reproducer

Country Status (1)

Country Link
JP (1) JPS5724047A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5954002A (en) * 1982-09-21 1984-03-28 Sharp Corp Thermomagnetic recorder
JPS6010401A (en) * 1983-06-30 1985-01-19 Fujitsu Ltd Optical magnetic disc device
US4748606A (en) * 1985-04-29 1988-05-31 Sony Corporation External magnetic field inverting apparatus for magneto-optical disc apparatus
JPH0589556A (en) * 1992-04-03 1993-04-09 Sharp Corp Thermomagnetic recorder
US5229983A (en) * 1989-12-28 1993-07-20 Matsushita Electric Industrial Co., Ltd. Bias magnetic field generating apparatus for magneto-optical recording and reproducing system
US5420832A (en) * 1992-11-13 1995-05-30 Hitachi, Ltd. Half height magnetooptical-disk recording and/or reproducing apparatus for a 5.25 inch large capacity magnetooptical-disk

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5954002A (en) * 1982-09-21 1984-03-28 Sharp Corp Thermomagnetic recorder
JPS6010401A (en) * 1983-06-30 1985-01-19 Fujitsu Ltd Optical magnetic disc device
JPH0370846B2 (en) * 1983-06-30 1991-11-11 Fujitsu Ltd
US4748606A (en) * 1985-04-29 1988-05-31 Sony Corporation External magnetic field inverting apparatus for magneto-optical disc apparatus
US5229983A (en) * 1989-12-28 1993-07-20 Matsushita Electric Industrial Co., Ltd. Bias magnetic field generating apparatus for magneto-optical recording and reproducing system
JPH0589556A (en) * 1992-04-03 1993-04-09 Sharp Corp Thermomagnetic recorder
US5420832A (en) * 1992-11-13 1995-05-30 Hitachi, Ltd. Half height magnetooptical-disk recording and/or reproducing apparatus for a 5.25 inch large capacity magnetooptical-disk
US5537370A (en) * 1992-11-13 1996-07-16 Hitachi, Ltd. Magnetooptical-disk recording and/or reproducing apparatus for a 5.25 inch large capacity magnetooptical-disk
US5668787A (en) * 1992-11-13 1997-09-16 Hitachi, Ltd. Mark length recording system with trial writing to maximize recording power and error recovery

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