JPS6410449A - Optical head - Google Patents

Optical head

Info

Publication number
JPS6410449A
JPS6410449A JP16641287A JP16641287A JPS6410449A JP S6410449 A JPS6410449 A JP S6410449A JP 16641287 A JP16641287 A JP 16641287A JP 16641287 A JP16641287 A JP 16641287A JP S6410449 A JPS6410449 A JP S6410449A
Authority
JP
Japan
Prior art keywords
polarized
optical
storage medium
plates
photoelectric conversion
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
JP16641287A
Other languages
Japanese (ja)
Other versions
JP2636244B2 (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 JP62166412A priority Critical patent/JP2636244B2/en
Priority to US07/213,813 priority patent/US4933924A/en
Publication of JPS6410449A publication Critical patent/JPS6410449A/en
Application granted granted Critical
Publication of JP2636244B2 publication Critical patent/JP2636244B2/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)

Abstract

PURPOSE:To contrive to make the device small in size by using a holographic element so as to divide a reflected light from a storage medium into two, receiving the lights by photoelectric converting elements and making the polarized axis of two polarized plates different from each other thereby simplifying the optical system. CONSTITUTION:The luminous fluxes 103, 104 being the result of two-division of a reflected light 101 from an optical storage medium by a holographic element 102 are collected by a condenser lens 105 and the light detected by polarized plates 106, 107 is received by photoelectric conversion elements 108, 109. In this case, the polarized axis direction of the polarized plates 106, 107 is not the same but arranged by a different angle obliquely with respect to the polarized direction of the radiated light from the optical head. Thus, the distance between two photoelectric conversion elements is made close and a magneto- optical signal is obtained by a 2-split photodiode 315. Thus, the optical system is simplified and number of condenser lenses is reduced by one more than that of a conventional device and the device is made small in size.
JP62166412A 1987-07-03 1987-07-03 Optical head for magneto-optical storage Expired - Fee Related JP2636244B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP62166412A JP2636244B2 (en) 1987-07-03 1987-07-03 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
JP62166412A JP2636244B2 (en) 1987-07-03 1987-07-03 Optical head for magneto-optical storage

Publications (2)

Publication Number Publication Date
JPS6410449A true JPS6410449A (en) 1989-01-13
JP2636244B2 JP2636244B2 (en) 1997-07-30

Family

ID=15830944

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62166412A Expired - Fee Related JP2636244B2 (en) 1987-07-03 1987-07-03 Optical head for magneto-optical storage

Country Status (1)

Country Link
JP (1) JP2636244B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2653693A1 (en) * 1989-10-27 1991-05-03 Siderurgie Fse Inst Rech METHOD AND DEVICE FOR CONTINUOUS CASTING THIN METAL PRODUCTS BETWEEN TWO CYLINDERS.

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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2653693A1 (en) * 1989-10-27 1991-05-03 Siderurgie Fse Inst Rech METHOD AND DEVICE FOR CONTINUOUS CASTING THIN METAL PRODUCTS BETWEEN TWO CYLINDERS.

Also Published As

Publication number Publication date
JP2636244B2 (en) 1997-07-30

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Legal Events

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