JPS6413246A - Optical head for magneto-optical storage - Google Patents

Optical head for magneto-optical storage

Info

Publication number
JPS6413246A
JPS6413246A JP62169461A JP16946187A JPS6413246A JP S6413246 A JPS6413246 A JP S6413246A JP 62169461 A JP62169461 A JP 62169461A JP 16946187 A JP16946187 A JP 16946187A JP S6413246 A JPS6413246 A JP S6413246A
Authority
JP
Japan
Prior art keywords
light
recording medium
optical
magneto
constitution
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
JP62169461A
Other languages
Japanese (ja)
Other versions
JP2636245B2 (en
Inventor
Masatoshi Yonekubo
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.)
Seiko Epson Corp
Original Assignee
Seiko Epson 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 Seiko Epson Corp filed Critical Seiko Epson Corp
Priority to JP62169461A priority Critical patent/JP2636245B2/en
Priority to US07/213,813 priority patent/US4933924A/en
Publication of JPS6413246A publication Critical patent/JPS6413246A/en
Application granted granted Critical
Publication of JP2636245B2 publication Critical patent/JP2636245B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
    • G11B7/0909—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only by astigmatic methods
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
    • G11B7/0912—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only by push-pull method

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)

Abstract

PURPOSE:To make an optical system small through the constitution of minimum elements by installing a holographic element to divide a reflected light from a recording medium into two in an optical path between a light source and the recording medium. CONSTITUTION:The emitted light of a semiconductor laser 201 is converged on the recording medium 204, and its reflected light is made incident on the holographic element 205 of an unequal pitch grating such that a grating interval comes gradually narrow as it approaches to a periphery, and the flux of light is divided into two by the generation of an astigmatism, and the two are detected by deflecting plates 206, 207, and a servo signal and a magneto-optical signal are obtained by photodiodes 208, 209. Accordingly, the element 205 is placed in the midway of the light source and the recording medium, and a light emitting part and a light receiving part are made to draw near each other, and a beam splitter or a convex lens are omitted, and the optical system can be made small by constituting it of minimum elements.
JP62169461A 1987-07-03 1987-07-07 Optical head for magneto-optical storage Expired - Fee Related JP2636245B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP62169461A JP2636245B2 (en) 1987-07-07 1987-07-07 Optical head for magneto-optical storage
US07/213,813 US4933924A (en) 1987-07-03 1988-06-30 Optical head and magneto-optical read/write device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62169461A JP2636245B2 (en) 1987-07-07 1987-07-07 Optical head for magneto-optical storage

Publications (2)

Publication Number Publication Date
JPS6413246A true JPS6413246A (en) 1989-01-18
JP2636245B2 JP2636245B2 (en) 1997-07-30

Family

ID=15887006

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62169461A Expired - Fee Related JP2636245B2 (en) 1987-07-03 1987-07-07 Optical head for magneto-optical storage

Country Status (1)

Country Link
JP (1) JP2636245B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5212572A (en) * 1991-11-22 1993-05-18 International Business Machines Corporation Optical data storage system with compact holographic polarization-sensing or reflectivity-sensing optical storage head
US5272550A (en) * 1991-10-11 1993-12-21 International Business Machines Corporation Hologram system
US5331445A (en) * 1992-08-18 1994-07-19 International Business Machines Corporation Increased Bragg angle sensitivity hologram system and method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62103857A (en) * 1985-10-31 1987-05-14 Mitsubishi Electric Corp Optical pickup device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62103857A (en) * 1985-10-31 1987-05-14 Mitsubishi Electric Corp Optical pickup device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5272550A (en) * 1991-10-11 1993-12-21 International Business Machines Corporation Hologram system
US5212572A (en) * 1991-11-22 1993-05-18 International Business Machines Corporation Optical data storage system with compact holographic polarization-sensing or reflectivity-sensing optical storage head
US5331445A (en) * 1992-08-18 1994-07-19 International Business Machines Corporation Increased Bragg angle sensitivity hologram system and method

Also Published As

Publication number Publication date
JP2636245B2 (en) 1997-07-30

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees