JPS647353A - Magneto-optical recording and reproducing device - Google Patents

Magneto-optical recording and reproducing device

Info

Publication number
JPS647353A
JPS647353A JP16256287A JP16256287A JPS647353A JP S647353 A JPS647353 A JP S647353A JP 16256287 A JP16256287 A JP 16256287A JP 16256287 A JP16256287 A JP 16256287A JP S647353 A JPS647353 A JP S647353A
Authority
JP
Japan
Prior art keywords
magnetic field
coil
laser beam
objective lens
intensity
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
JP16256287A
Other languages
Japanese (ja)
Inventor
Yutaka Mazaki
Isamu Nose
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry 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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP16256287A priority Critical patent/JPS647353A/en
Publication of JPS647353A publication Critical patent/JPS647353A/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
    • G11B11/10532—Heads
    • G11B11/10534—Heads for recording by magnetising, demagnetising or transfer of magnetisation, by radiation, e.g. for thermomagnetic recording
    • G11B11/10536—Heads for recording by magnetising, demagnetising or transfer of magnetisation, by radiation, e.g. for thermomagnetic recording using thermic beams, e.g. lasers
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)

Abstract

PURPOSE:To contrive the miniaturization of a power unit by selecting the intensity of a magnetic field giving effect onto the recording/erasure of leaked magnetic field generated from an objective lens driving device to be a prescribed relation with respect to the intensity of the magnetic field required for recording/erasure at a spot position on a recording medium face. CONSTITUTION:A laser beam is radiated to a point O on a recording medium 100 through an objective lens 211 to cause a current to flow through a coil 301a of an electromagnet 301 and to apply the magnetic field Hw generated thereby to the point O to record information and read out the information through the radiation of a weak laser beam. Moreover, a current is given in the coil 301a to apply a magnetic field He to the point O, thereby erasing the information through the use of an intensive laser beam. in this case, the power consumption consumed in the coil 301a of a device 300 is reduced by selecting the arrangement between the magnetic circuit of an objective lens driving device 200 and a magnetic field application device 300 so as to obtain the relation of Hm=1/2(Hw+He), where Hm is the magnetic field intensity, thereby reducing the heat production. Thus, the small-sized device is realized.
JP16256287A 1987-06-30 1987-06-30 Magneto-optical recording and reproducing device Pending JPS647353A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16256287A JPS647353A (en) 1987-06-30 1987-06-30 Magneto-optical recording and reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16256287A JPS647353A (en) 1987-06-30 1987-06-30 Magneto-optical recording and reproducing device

Publications (1)

Publication Number Publication Date
JPS647353A true JPS647353A (en) 1989-01-11

Family

ID=15756948

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16256287A Pending JPS647353A (en) 1987-06-30 1987-06-30 Magneto-optical recording and reproducing device

Country Status (1)

Country Link
JP (1) JPS647353A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002025140A (en) * 2000-07-05 2002-01-25 Olympus Optical Co Ltd Magneto-optical disk device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002025140A (en) * 2000-07-05 2002-01-25 Olympus Optical Co Ltd Magneto-optical disk device

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