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JPS57200958A - Recording pattern reading opticl system - Google Patents

Recording pattern reading opticl system

Info

Publication number
JPS57200958A
JPS57200958A JP56085428A JP8542881A JPS57200958A JP S57200958 A JPS57200958 A JP S57200958A JP 56085428 A JP56085428 A JP 56085428A JP 8542881 A JP8542881 A JP 8542881A JP S57200958 A JPS57200958 A JP S57200958A
Authority
JP
Japan
Prior art keywords
luminous flux
polarized
photodetector
phi
recording pattern
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
JP56085428A
Other languages
Japanese (ja)
Other versions
JPH0237611B2 (en
Inventor
Kazuya Matsumoto
Kiyonobu Endo
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP56085428A priority Critical patent/JPS57200958A/en
Priority to US06/382,202 priority patent/US4561032A/en
Publication of JPS57200958A publication Critical patent/JPS57200958A/en
Publication of JPH0237611B2 publication Critical patent/JPH0237611B2/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

Landscapes

  • Optical Head (AREA)

Abstract

PURPOSE:To obtain a recording pattern which is remarkable in a difference of light and shade, by comparing with a polarization component in a prescribed direction of a modulation luminous flux, increasing relatively a polarization component in the direction being vertical to said direction, and substantially expanding an angle of rotation of the modulation luminous flux. CONSTITUTION:An optical element 9 has such a quality as transmission and reflection factors are different depending on its polarized direction. In case when a luminous flux (b) which has passed through the optical element 9 is reflected by a vertical magnetic recording body 10, the polarized surface is rotated in accordance with a magnetizing direction of an area illuminated by the luminous flux due to a Kerr effect. When the transmission polarized direction of a photodetector 11 is placed vertically in a polarized direction -phi of a luminous flux (d), a luminous flux having its polarized direction in the -phi direction is cut off, only a diagonal shaped component against the transmitting direction of the photodetector 11 of the polarized luminous flux in the phi direction transmits the photodetector 11.
JP56085428A 1981-06-02 1981-06-02 Recording pattern reading opticl system Granted JPS57200958A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP56085428A JPS57200958A (en) 1981-06-02 1981-06-02 Recording pattern reading opticl system
US06/382,202 US4561032A (en) 1981-06-02 1982-05-26 Magnetooptic reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56085428A JPS57200958A (en) 1981-06-02 1981-06-02 Recording pattern reading opticl system

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP4171173A Division JPH0748270B2 (en) 1992-06-29 1992-06-29 Recording pattern reading optical system

Publications (2)

Publication Number Publication Date
JPS57200958A true JPS57200958A (en) 1982-12-09
JPH0237611B2 JPH0237611B2 (en) 1990-08-27

Family

ID=13858556

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56085428A Granted JPS57200958A (en) 1981-06-02 1981-06-02 Recording pattern reading opticl system

Country Status (1)

Country Link
JP (1) JPS57200958A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60101745A (en) * 1983-11-08 1985-06-05 Sharp Corp Optical device of photomagnetic storage device
JPS6356854A (en) * 1986-08-28 1988-03-11 Canon Inc Rotary head type recording or reproducing device
US4907858A (en) * 1984-11-16 1990-03-13 Canon Kabushiki Kaisha Optical pickup apparatus
US5420848A (en) * 1990-08-02 1995-05-30 Canon Kabushiki Kaisha Optical system for optical information recording/reproducing apparatus having a galvano mirror
JPH07296440A (en) * 1994-08-05 1995-11-10 Sharp Corp Magneto-optical storage device
US5517480A (en) * 1989-09-29 1996-05-14 Canon Kabushiki Kaisha Magneto-optical information reproducing apparatus that splits a light beam into at least three light beams advancing in the same direction

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60101745A (en) * 1983-11-08 1985-06-05 Sharp Corp Optical device of photomagnetic storage device
US4907858A (en) * 1984-11-16 1990-03-13 Canon Kabushiki Kaisha Optical pickup apparatus
JPS6356854A (en) * 1986-08-28 1988-03-11 Canon Inc Rotary head type recording or reproducing device
US5517480A (en) * 1989-09-29 1996-05-14 Canon Kabushiki Kaisha Magneto-optical information reproducing apparatus that splits a light beam into at least three light beams advancing in the same direction
US5420848A (en) * 1990-08-02 1995-05-30 Canon Kabushiki Kaisha Optical system for optical information recording/reproducing apparatus having a galvano mirror
JPH07296440A (en) * 1994-08-05 1995-11-10 Sharp Corp Magneto-optical storage device
JP2510131B2 (en) * 1994-08-05 1996-06-26 シャープ株式会社 Magneto-optical storage device

Also Published As

Publication number Publication date
JPH0237611B2 (en) 1990-08-27

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