JPS5755547A - Information reader of photomagnetic recording medium - Google Patents

Information reader of photomagnetic recording medium

Info

Publication number
JPS5755547A
JPS5755547A JP55130837A JP13083780A JPS5755547A JP S5755547 A JPS5755547 A JP S5755547A JP 55130837 A JP55130837 A JP 55130837A JP 13083780 A JP13083780 A JP 13083780A JP S5755547 A JPS5755547 A JP S5755547A
Authority
JP
Japan
Prior art keywords
light
recording medium
information
turned
reading
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
JP55130837A
Other languages
Japanese (ja)
Other versions
JPH0115932B2 (en
Inventor
Kiichi Kato
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.)
Olympus Corp
Original Assignee
Olympus Corp
Olympus Optical Co Ltd
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 Olympus Corp, Olympus Optical Co Ltd filed Critical Olympus Corp
Priority to JP55130837A priority Critical patent/JPS5755547A/en
Publication of JPS5755547A publication Critical patent/JPS5755547A/en
Publication of JPH0115932B2 publication Critical patent/JPH0115932B2/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 realize the reading of information with high accuracy, by installing a Faraday rotator between a light source and a photomagnetic recording medium to prevent the return of the harmful reflected light to the light source and accordingly stabilizing the reading light source. CONSTITUTION:The beam sent from a laser beam source 1 is made incident to a Faraday rotator 12 after turned into a linear polarized light via a collimator lens 2 and a polarizer 3 to be turned by 45 deg.. This linear polarized light is furthermore irradiated in the form of a spot to a photomagnetic recording medium 7 via a mirror 4, a half mirror 5 and an objective lens 6. Thus the information is read. On the other hand, the light reflected by the medium 7 and passed through the mirror 5 is turned by another 45 deg. by the rotator 12 and accordingly cut off by the polarizer 3. As a result, no harmful light returns to the beam source 1 to always ensure the assured reading of information.
JP55130837A 1980-09-22 1980-09-22 Information reader of photomagnetic recording medium Granted JPS5755547A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55130837A JPS5755547A (en) 1980-09-22 1980-09-22 Information reader of photomagnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55130837A JPS5755547A (en) 1980-09-22 1980-09-22 Information reader of photomagnetic recording medium

Publications (2)

Publication Number Publication Date
JPS5755547A true JPS5755547A (en) 1982-04-02
JPH0115932B2 JPH0115932B2 (en) 1989-03-22

Family

ID=15043850

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55130837A Granted JPS5755547A (en) 1980-09-22 1980-09-22 Information reader of photomagnetic recording medium

Country Status (1)

Country Link
JP (1) JPS5755547A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5766537A (en) * 1980-10-09 1982-04-22 Sharp Corp Magnetooptic recording and reproducing device
JPS5979447A (en) * 1982-09-27 1984-05-08 エヌ・ベ−・フイリツプス・フル−イランペンフアブリケン Thermomagnetic optical type recorder and recording medium therefor
JPS6052248A (en) * 1983-08-30 1985-03-25 Aichi Steel Works Ltd Method of polishing end face of rod-like material
JPS6171932A (en) * 1984-09-14 1986-04-12 Iruma Seiki Kk Machining method of material
JPS63146312U (en) * 1987-03-17 1988-09-27
JPH0991746A (en) * 1995-09-27 1997-04-04 Nec Corp Optical head

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51148405A (en) * 1975-06-02 1976-12-20 Philips Nv Recording carrier reader
JPS5558834A (en) * 1978-10-27 1980-05-01 Fujitsu Ltd Optical readout method
JPS5576322A (en) * 1978-12-02 1980-06-09 Fujitsu Ltd Light isolator
JPS5619176A (en) * 1979-07-25 1981-02-23 Mitsubishi Electric Corp Optical information reader

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51148405A (en) * 1975-06-02 1976-12-20 Philips Nv Recording carrier reader
JPS5558834A (en) * 1978-10-27 1980-05-01 Fujitsu Ltd Optical readout method
JPS5576322A (en) * 1978-12-02 1980-06-09 Fujitsu Ltd Light isolator
JPS5619176A (en) * 1979-07-25 1981-02-23 Mitsubishi Electric Corp Optical information reader

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5766537A (en) * 1980-10-09 1982-04-22 Sharp Corp Magnetooptic recording and reproducing device
JPS5979447A (en) * 1982-09-27 1984-05-08 エヌ・ベ−・フイリツプス・フル−イランペンフアブリケン Thermomagnetic optical type recorder and recording medium therefor
JPS6052248A (en) * 1983-08-30 1985-03-25 Aichi Steel Works Ltd Method of polishing end face of rod-like material
JPS6171932A (en) * 1984-09-14 1986-04-12 Iruma Seiki Kk Machining method of material
JPS63146312U (en) * 1987-03-17 1988-09-27
JPH0991746A (en) * 1995-09-27 1997-04-04 Nec Corp Optical head

Also Published As

Publication number Publication date
JPH0115932B2 (en) 1989-03-22

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