JPS5558834A - Optical readout method - Google Patents

Optical readout method

Info

Publication number
JPS5558834A
JPS5558834A JP13231578A JP13231578A JPS5558834A JP S5558834 A JPS5558834 A JP S5558834A JP 13231578 A JP13231578 A JP 13231578A JP 13231578 A JP13231578 A JP 13231578A JP S5558834 A JPS5558834 A JP S5558834A
Authority
JP
Japan
Prior art keywords
magnetic
recording
light
photo detector
optical
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
JP13231578A
Other languages
Japanese (ja)
Inventor
Miyao Oda
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP13231578A priority Critical patent/JPS5558834A/en
Publication of JPS5558834A publication Critical patent/JPS5558834A/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
    • 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
    • G11B11/10532—Heads
    • G11B11/10541—Heads for reproducing
    • G11B11/10543—Heads for reproducing using optical beam of radiation

Abstract

PURPOSE:To enable optical reading of recorded information which is high in S/N, accuracy and density, by reading out the magnetic recording or magnetic-optical recorded information thru modulation method. CONSTITUTION:The laser light produced from the laser oscillator 1 is converted into straight line polarized light with the polarizer 2, the polarized surface is oscillated in sinusoidal wave shape with the Faraday turning element 3, and the light is collected on the recording media 6 via the half mirror 4 and the objective lens 5. On the medium 6, the magnetic recorded information or the magnetic-optical recording information is recorded, and the polarized surface is shifted when the laser light is on the media 6 and it is collected to the place where magnetic recording is made. This reflection light is incident to the photo detector 7 via the lens 5 and the half mirror 4. Further, by suitably adjusting the angle between the polarizer 2 and photo detector 7, when the output of the photo detector 8 is in synchronous detection with the synchronous detector 9 with the oscillation signal on the polarized surface, the output on the recording information 1 or 0 can be obtained.
JP13231578A 1978-10-27 1978-10-27 Optical readout method Pending JPS5558834A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13231578A JPS5558834A (en) 1978-10-27 1978-10-27 Optical readout method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13231578A JPS5558834A (en) 1978-10-27 1978-10-27 Optical readout method

Publications (1)

Publication Number Publication Date
JPS5558834A true JPS5558834A (en) 1980-05-01

Family

ID=15078434

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13231578A Pending JPS5558834A (en) 1978-10-27 1978-10-27 Optical readout method

Country Status (1)

Country Link
JP (1) JPS5558834A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5744241A (en) * 1980-08-27 1982-03-12 Matsushita Electric Ind Co Ltd Magnetooptic reproducer
JPS5755547A (en) * 1980-09-22 1982-04-02 Olympus Optical Co Ltd Information reader of photomagnetic recording medium
JPS5766537A (en) * 1980-10-09 1982-04-22 Sharp Corp Magnetooptic recording and reproducing device
FR2499746A1 (en) * 1981-02-06 1982-08-13 Sharp Kk MAGNETO-OPTICAL RECORDING / READING HEAD

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5744241A (en) * 1980-08-27 1982-03-12 Matsushita Electric Ind Co Ltd Magnetooptic reproducer
JPS5755547A (en) * 1980-09-22 1982-04-02 Olympus Optical Co Ltd Information reader of photomagnetic recording medium
JPS5766537A (en) * 1980-10-09 1982-04-22 Sharp Corp Magnetooptic recording and reproducing device
FR2499746A1 (en) * 1981-02-06 1982-08-13 Sharp Kk MAGNETO-OPTICAL RECORDING / READING HEAD

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