FR2598521B1 - OPTICAL SYSTEM OF A PHOTO-ELECTRO-MAGNETIC RECORDING AND REPRODUCING DEVICE. - Google Patents

OPTICAL SYSTEM OF A PHOTO-ELECTRO-MAGNETIC RECORDING AND REPRODUCING DEVICE.

Info

Publication number
FR2598521B1
FR2598521B1 FR8706654A FR8706654A FR2598521B1 FR 2598521 B1 FR2598521 B1 FR 2598521B1 FR 8706654 A FR8706654 A FR 8706654A FR 8706654 A FR8706654 A FR 8706654A FR 2598521 B1 FR2598521 B1 FR 2598521B1
Authority
FR
France
Prior art keywords
electro
photo
optical system
magnetic recording
reproducing device
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.)
Expired - Lifetime
Application number
FR8706654A
Other languages
French (fr)
Other versions
FR2598521A1 (en
Inventor
Yoshihiro Utsumi
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.)
Pioneer Corp
Original Assignee
Pioneer Electronic 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 Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Publication of FR2598521A1 publication Critical patent/FR2598521A1/en
Application granted granted Critical
Publication of FR2598521B1 publication Critical patent/FR2598521B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G11B11/1055—Disposition or mounting of transducers relative to record carriers
    • G11B11/10576—Disposition or mounting of transducers relative to record carriers with provision for moving the transducers for maintaining alignment or spacing relative to the carrier
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/16—Beam splitting or combining systems used as aids for focusing
    • 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

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)
  • Mechanical Optical Scanning Systems (AREA)
  • Optical Recording Or Reproduction (AREA)
FR8706654A 1986-05-12 1987-05-12 OPTICAL SYSTEM OF A PHOTO-ELECTRO-MAGNETIC RECORDING AND REPRODUCING DEVICE. Expired - Lifetime FR2598521B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7080786U JPH0810854Y2 (en) 1986-05-12 1986-05-12 Magneto-optical recording medium reproducing device

Publications (2)

Publication Number Publication Date
FR2598521A1 FR2598521A1 (en) 1987-11-13
FR2598521B1 true FR2598521B1 (en) 1991-11-08

Family

ID=13442201

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8706654A Expired - Lifetime FR2598521B1 (en) 1986-05-12 1987-05-12 OPTICAL SYSTEM OF A PHOTO-ELECTRO-MAGNETIC RECORDING AND REPRODUCING DEVICE.

Country Status (3)

Country Link
JP (1) JPH0810854Y2 (en)
DE (1) DE3715443C2 (en)
FR (1) FR2598521B1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2624241B2 (en) * 1986-07-31 1997-06-25 松下電器産業株式会社 Magneto-optical disk device
EP0331476A1 (en) * 1988-03-03 1989-09-06 Canon Kabushiki Kaisha Magneto-optical information reproducing apparatus having a polarizing beam splitter disposed with an inclination of 45
DE69018503T2 (en) * 1989-05-02 1995-08-17 Pioneer Electronic Corp Optical head.
DE19645110A1 (en) * 1996-11-01 1998-05-07 Thomson Brandt Gmbh Recording or reproducing device and method for detecting a focus state

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7907216A (en) * 1979-09-28 1981-03-31 Philips Nv OPTICAL FOCUS ERROR DETECTION SYSTEM.
JPS57147148A (en) * 1981-03-05 1982-09-10 Olympus Optical Co Ltd Information reproducer with magnetooptic system
DE3429382A1 (en) * 1983-08-10 1985-02-28 Canon K.K., Tokio/Tokyo OPTICAL HEAD
JPS61236035A (en) * 1985-04-09 1986-10-21 Sony Corp Optical head

Also Published As

Publication number Publication date
FR2598521A1 (en) 1987-11-13
JPS62186228U (en) 1987-11-26
DE3715443A1 (en) 1987-11-19
JPH0810854Y2 (en) 1996-03-29
DE3715443C2 (en) 1998-02-26

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Legal Events

Date Code Title Description
DL Decision of the director general to leave to make available licences of right
ST Notification of lapse

Effective date: 20070131