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
English (en)
Japanese (ja)
Other versions
JPH0237611B2 (enrdf_load_stackoverflow
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/ja
Priority to US06/382,202 priority patent/US4561032A/en
Publication of JPS57200958A publication Critical patent/JPS57200958A/ja
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)
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 (ja) 1992-06-29 1992-06-29 記録パターン読取光学系

Publications (2)

Publication Number Publication Date
JPS57200958A true JPS57200958A (en) 1982-12-09
JPH0237611B2 JPH0237611B2 (enrdf_load_stackoverflow) 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 (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60101745A (ja) * 1983-11-08 1985-06-05 Sharp Corp 光磁気記憶装置の光学装置
JPS6356854A (ja) * 1986-08-28 1988-03-11 Canon Inc 回転ヘツド型記録または再生装置
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 (ja) * 1994-08-05 1995-11-10 Sharp Corp 光磁気記憶装置
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 (ja) * 1983-11-08 1985-06-05 Sharp Corp 光磁気記憶装置の光学装置
US4907858A (en) * 1984-11-16 1990-03-13 Canon Kabushiki Kaisha Optical pickup apparatus
JPS6356854A (ja) * 1986-08-28 1988-03-11 Canon Inc 回転ヘツド型記録または再生装置
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 (ja) * 1994-08-05 1995-11-10 Sharp Corp 光磁気記憶装置
JP2510131B2 (ja) * 1994-08-05 1996-06-26 シャープ株式会社 光磁気記憶装置

Also Published As

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

Similar Documents

Publication Publication Date Title
CA2147462A1 (en) System for Detecting Ice on Metal Surface
EP0359461A3 (en) Optical element and system
EP0372881A3 (en) Optical output controlling method and apparatus therefor
JPS5263614A (en) Information detector
CA2011303A1 (en) Method for identifying an optical transmission medium, apparatus for identifying the same and method for optical telecommunication
CA2059732A1 (en) Reflector for a surface light source
JPS5330223A (en) Automaitc code reading unit
CA2058514A1 (en) Polarization illumination device and projector having the same
JPS57158004A (en) Magnetic transfer recorder
EP0147098A3 (en) Electro-optic switching system using circularly polarized light
DE3682194D1 (de) Optische systeme mit antireziproken polarisationsdrehern.
JPS54143012A (en) Information reader
JPS57200958A (en) Recording pattern reading opticl system
DE3476832D1 (en) Angle transducer employing polarized light
CA2009129A1 (en) Image pickup head for image pickup device
ES285581U (es) Un disco legible opticamente
DE68920169D1 (de) Optisches Aufzeichungsmedium mit einer verbesserten reflektierenden dünnen Schicht.
CA2036890A1 (en) Magneto-optic recording disk and method of reproducing recorded signals
JPS57205840A (en) Vertical magnetic recording and reproducing device
DE69002220D1 (de) Sicherheitsbindung mit einer platte.
GB1285640A (en) Optical devices
JPS647354A (en) Reading head of magneto-optical data carrier
JPS6454207A (en) Optical measuring apparatus of film thickness
JPS52133719A (en) Information reader for mov ing object
JPS52127259A (en) Observing surface sharpe