JPS57176550A - Recording and reproducing method for optical magnetic recording medium - Google Patents

Recording and reproducing method for optical magnetic recording medium

Info

Publication number
JPS57176550A
JPS57176550A JP6082481A JP6082481A JPS57176550A JP S57176550 A JPS57176550 A JP S57176550A JP 6082481 A JP6082481 A JP 6082481A JP 6082481 A JP6082481 A JP 6082481A JP S57176550 A JPS57176550 A JP S57176550A
Authority
JP
Japan
Prior art keywords
thin film
light
magnetic
polarizer
photodetectors
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
JP6082481A
Other languages
Japanese (ja)
Inventor
Hideo Ando
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP6082481A priority Critical patent/JPS57176550A/en
Publication of JPS57176550A publication Critical patent/JPS57176550A/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

Abstract

PURPOSE:To surely read a reproducing signal, by inverting or storing the moment of thin film at a prescribed period in which the magnetic moments are unidirectionally arranged and reproducing signals through the utilization of the polarized light characteristics. CONSTITUTION:A light from a laser light source 1 is irradiated on a thin film 8a on a disc 8 via a polarizer 2, condenser lens 3, a photo modulator 4, a polarizer 5, a half mirror 6, and a condenser lens 7, and heat is applied and a magnetic field is given via a coil 9, resulting that the magnetic moments can be arranged so that the S pole is upward and the N pole is downward. Next, according to pit information, the magnetic moment is inverted or stored with a prescribed period with similar operation to record the information. The reflection of spot on a thin film 8a of reading light weakened at the photo modulator 4 is split at a half mirror 10, the reflected light from the S and N poles respectively enters into photodetectors 13 and 14 via photodetectors 11 and 12, and the output is surely read as a reproducing signal via a differential amplifier 15 and a lock-in amplifier 16.
JP6082481A 1981-04-22 1981-04-22 Recording and reproducing method for optical magnetic recording medium Pending JPS57176550A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6082481A JPS57176550A (en) 1981-04-22 1981-04-22 Recording and reproducing method for optical magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6082481A JPS57176550A (en) 1981-04-22 1981-04-22 Recording and reproducing method for optical magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS57176550A true JPS57176550A (en) 1982-10-29

Family

ID=13153484

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6082481A Pending JPS57176550A (en) 1981-04-22 1981-04-22 Recording and reproducing method for optical magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS57176550A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0260114A2 (en) * 1986-09-12 1988-03-16 Canon Kabushiki Kaisha Opto-magnetic signal reproducing apparatus for reading, by differential detection using a magneto-optical effect, information magnetically recorded on a record medium
JPH0490027U (en) * 1991-05-30 1992-08-06

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0260114A2 (en) * 1986-09-12 1988-03-16 Canon Kabushiki Kaisha Opto-magnetic signal reproducing apparatus for reading, by differential detection using a magneto-optical effect, information magnetically recorded on a record medium
US4953124A (en) * 1986-09-12 1990-08-28 Canon Kabushiki Kaisha Opto-magnetic signal reproducing apparatus for reading, by differential detection using a magneto-optical effect, information magnetically recorded on a record medium
JPH0490027U (en) * 1991-05-30 1992-08-06

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