JPS5328405A - Optical information reproducer - Google Patents

Optical information reproducer

Info

Publication number
JPS5328405A
JPS5328405A JP10278076A JP10278076A JPS5328405A JP S5328405 A JPS5328405 A JP S5328405A JP 10278076 A JP10278076 A JP 10278076A JP 10278076 A JP10278076 A JP 10278076A JP S5328405 A JPS5328405 A JP S5328405A
Authority
JP
Japan
Prior art keywords
optical information
information reproducer
light
andletting
letting
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
JP10278076A
Other languages
Japanese (ja)
Other versions
JPS5920169B2 (en
Inventor
Kazuo Okada
Naohiro Tomikawa
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP51102780A priority Critical patent/JPS5920169B2/en
Publication of JPS5328405A publication Critical patent/JPS5328405A/en
Publication of JPS5920169B2 publication Critical patent/JPS5920169B2/en
Expired 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
    • 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

Abstract

PURPOSE:Input and output lights are separated by letting the light out from a light source enter one of the two opening regions bisected by the boundary line passing through the center of a condensing lens andletting the reflected light from a recording carrier pass through other opening region.
JP51102780A 1976-08-27 1976-08-27 Optical information reproducing device Expired JPS5920169B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP51102780A JPS5920169B2 (en) 1976-08-27 1976-08-27 Optical information reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP51102780A JPS5920169B2 (en) 1976-08-27 1976-08-27 Optical information reproducing device

Publications (2)

Publication Number Publication Date
JPS5328405A true JPS5328405A (en) 1978-03-16
JPS5920169B2 JPS5920169B2 (en) 1984-05-11

Family

ID=14336648

Family Applications (1)

Application Number Title Priority Date Filing Date
JP51102780A Expired JPS5920169B2 (en) 1976-08-27 1976-08-27 Optical information reproducing device

Country Status (1)

Country Link
JP (1) JPS5920169B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2460523A1 (en) * 1979-06-29 1981-01-23 Thomson Csf SEMICONDUCTOR LASER SOURCE OPTICAL READING HEAD AND DEVICE FOR REFLECTING AN INFORMATION MEDIUM COMPRISING SUCH AN OPTICAL HEAD
US4546460A (en) * 1981-10-22 1985-10-08 Tokyo Shibaura Denki Kabushiki Kaisha Videodisc autofocus device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2460523A1 (en) * 1979-06-29 1981-01-23 Thomson Csf SEMICONDUCTOR LASER SOURCE OPTICAL READING HEAD AND DEVICE FOR REFLECTING AN INFORMATION MEDIUM COMPRISING SUCH AN OPTICAL HEAD
US4546460A (en) * 1981-10-22 1985-10-08 Tokyo Shibaura Denki Kabushiki Kaisha Videodisc autofocus device

Also Published As

Publication number Publication date
JPS5920169B2 (en) 1984-05-11

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