JPS5616950A - Optical information read-in unit - Google Patents

Optical information read-in unit

Info

Publication number
JPS5616950A
JPS5616950A JP9221279A JP9221279A JPS5616950A JP S5616950 A JPS5616950 A JP S5616950A JP 9221279 A JP9221279 A JP 9221279A JP 9221279 A JP9221279 A JP 9221279A JP S5616950 A JPS5616950 A JP S5616950A
Authority
JP
Japan
Prior art keywords
information
polarization
recording
carrier
unit
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
JP9221279A
Other languages
Japanese (ja)
Other versions
JPS618498B2 (en
Inventor
Noriaki Tsukada
Ikuyuki Miyazawa
Kazuo Okada
Kazuhisa Nishi
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 JP9221279A priority Critical patent/JPS5616950A/en
Publication of JPS5616950A publication Critical patent/JPS5616950A/en
Publication of JPS618498B2 publication Critical patent/JPS618498B2/ja
Granted 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
    • G11B11/10532—Heads

Landscapes

  • Optical Head (AREA)

Abstract

PURPOSE:To enable the erase of information and new recording and the read-in of information with high sensitivity, by inserting the Farady element in the information recording carrier and optical path having the effect of magnetizing force. CONSTITUTION:The information recording carrier 9 is constituted so that the change in the polarization characteristics of reflection light can be accompanied. When the radiant ray of straight line polarization is emitted to the vertical magnetization on the recording film surface, the direction of polarization is slightly turned with the effect of magnetic force. By changing the direction of magnetization as shown in the arrow in Figure, the recording of information is possible. Further, the Farady element 10 is provided in the optical path. The laser light of the semiconductor laser 1 is collected to the carrier 9, the direction of polarization is slightly changed at reflection corresponding to the information, feedback is made to the active layer 2 and electric output is obtained at the specified circuit. In this case, the direction of polarization can be turned by pi/4 radian by the element 10. Thus, the erase of recording surface is possible, allowing to obtain the unit of high sensitivity.
JP9221279A 1979-07-19 1979-07-19 Optical information read-in unit Granted JPS5616950A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9221279A JPS5616950A (en) 1979-07-19 1979-07-19 Optical information read-in unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9221279A JPS5616950A (en) 1979-07-19 1979-07-19 Optical information read-in unit

Publications (2)

Publication Number Publication Date
JPS5616950A true JPS5616950A (en) 1981-02-18
JPS618498B2 JPS618498B2 (en) 1986-03-14

Family

ID=14048131

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9221279A Granted JPS5616950A (en) 1979-07-19 1979-07-19 Optical information read-in unit

Country Status (1)

Country Link
JP (1) JPS5616950A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2499746A1 (en) * 1981-02-06 1982-08-13 Sharp Kk MAGNETO-OPTICAL RECORDING / READING HEAD
US4409631A (en) * 1980-12-27 1983-10-11 Canon Kabushiki Kaisha Optical apparatus and method for reproducing information recorded in a magnetic recording medium
EP0276326A1 (en) * 1986-07-31 1988-08-03 Sony Corporation Optical disc recording/reproducing apparatus
US4953150A (en) * 1981-11-09 1990-08-28 Canon Kabushiki Kaisha Optical recording apparatus having improved erasing capability

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4409631A (en) * 1980-12-27 1983-10-11 Canon Kabushiki Kaisha Optical apparatus and method for reproducing information recorded in a magnetic recording medium
FR2499746A1 (en) * 1981-02-06 1982-08-13 Sharp Kk MAGNETO-OPTICAL RECORDING / READING HEAD
US4953150A (en) * 1981-11-09 1990-08-28 Canon Kabushiki Kaisha Optical recording apparatus having improved erasing capability
EP0276326A1 (en) * 1986-07-31 1988-08-03 Sony Corporation Optical disc recording/reproducing apparatus
US5042022A (en) * 1986-07-31 1991-08-20 Sony Corporation Optical disk recording/reproducing apparatus with synchronized data writing

Also Published As

Publication number Publication date
JPS618498B2 (en) 1986-03-14

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