JPS5661044A - Optical information reader - Google Patents

Optical information reader

Info

Publication number
JPS5661044A
JPS5661044A JP13699679A JP13699679A JPS5661044A JP S5661044 A JPS5661044 A JP S5661044A JP 13699679 A JP13699679 A JP 13699679A JP 13699679 A JP13699679 A JP 13699679A JP S5661044 A JPS5661044 A JP S5661044A
Authority
JP
Japan
Prior art keywords
light
reflected
critical angle
assymmetrical
radiated
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
JP13699679A
Other languages
English (en)
Other versions
JPS641858B2 (ja
Inventor
Kenichi Ito
Toru Musha
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 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 Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP13699679A priority Critical patent/JPS5661044A/ja
Priority to GB8020097A priority patent/GB2057218B/en
Priority to FR8014007A priority patent/FR2459991A1/fr
Priority to NL8003659A priority patent/NL192406C/nl
Priority to DE19803023779 priority patent/DE3023779A1/de
Publication of JPS5661044A publication Critical patent/JPS5661044A/ja
Publication of JPS641858B2 publication Critical patent/JPS641858B2/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
    • 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

Landscapes

  • Optical Head (AREA)
  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)
JP13699679A 1979-06-25 1979-10-25 Optical information reader Granted JPS5661044A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP13699679A JPS5661044A (en) 1979-10-25 1979-10-25 Optical information reader
GB8020097A GB2057218B (en) 1979-06-25 1980-06-19 Detecting focussing error
FR8014007A FR2459991A1 (fr) 1979-06-25 1980-06-24 Procede et dispositif de detection d'un signal d'erreur de focalisation
NL8003659A NL192406C (nl) 1979-06-25 1980-06-24 Inrichting voor het detecteren van een focusseringsfoutsignaal voor een objectieflens bij het aftasten van een informatiedrager.
DE19803023779 DE3023779A1 (de) 1979-06-25 1980-06-25 Verfahren zum feststellen der scharfeinstellung eines objektivs in bezug auf einen gegenstand und vorrichtung zur durchfuehrung des verfahrens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13699679A JPS5661044A (en) 1979-10-25 1979-10-25 Optical information reader

Publications (2)

Publication Number Publication Date
JPS5661044A true JPS5661044A (en) 1981-05-26
JPS641858B2 JPS641858B2 (ja) 1989-01-12

Family

ID=15188344

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13699679A Granted JPS5661044A (en) 1979-06-25 1979-10-25 Optical information reader

Country Status (1)

Country Link
JP (1) JPS5661044A (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6043240A (ja) * 1983-08-19 1985-03-07 Mitsubishi Electric Corp 光学的信号読出装置
US4525825A (en) * 1980-10-09 1985-06-25 Olympus Optical Co., Ltd. Method and apparatus for detecting focussing and tracking error signals

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4525825A (en) * 1980-10-09 1985-06-25 Olympus Optical Co., Ltd. Method and apparatus for detecting focussing and tracking error signals
JPS6043240A (ja) * 1983-08-19 1985-03-07 Mitsubishi Electric Corp 光学的信号読出装置
JPH0140409B2 (ja) * 1983-08-19 1989-08-29 Mitsubishi Electric Corp

Also Published As

Publication number Publication date
JPS641858B2 (ja) 1989-01-12

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