JPS5774841A - Control signal detector of optical information reader - Google Patents

Control signal detector of optical information reader

Info

Publication number
JPS5774841A
JPS5774841A JP5999681A JP5999681A JPS5774841A JP S5774841 A JPS5774841 A JP S5774841A JP 5999681 A JP5999681 A JP 5999681A JP 5999681 A JP5999681 A JP 5999681A JP S5774841 A JPS5774841 A JP S5774841A
Authority
JP
Japan
Prior art keywords
control signal
circuit
photodetecting
signals
differential photodiode
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
JP5999681A
Other languages
Japanese (ja)
Other versions
JPS6233650B2 (en
Inventor
Kenjiro Goto
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.)
Mansei Kogyo KK
Original Assignee
Mansei Kogyo KK
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 Mansei Kogyo KK filed Critical Mansei Kogyo KK
Priority to JP5999681A priority Critical patent/JPS5774841A/en
Publication of JPS5774841A publication Critical patent/JPS5774841A/en
Publication of JPS6233650B2 publication Critical patent/JPS6233650B2/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
    • G11B7/0938—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 servo format, e.g. guide tracks, pilot signals

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE:To exactly detect a recording information and a control signal without exerting influence on the detection of a converging focus control signal, by irradiating a sufficiently large image of a light beam irradiated onto an information medium, to a differential photodiode. CONSTITUTION:A parallel luminous flux 14 is converged onto a disk 21 through a half-mirror 35 and a lens 20. Reflected rays 14' go in the opposite direction, are converged in front of a differential photodiode 28 by a lens 36, are extended to some extent, and attain to a junction part 37 of a differential photodiode 23. Even if the half-mirror 35 is rotated in order to control an information track, a photodetecting element 23 is not influenced. Signals from two photodetecting elements 23a, 23b execute a focus control through a difference circuit, an automatic focus compensating circuit and an automatic focus driving device, and also two photodetecting signals detect video and sound signals through a summing circuit, and a signal from the summing circuit controls a deflecting device through a tracking circuit. In this way, a recording information and a control signal are detected exactly without exerting influence on the detection of a converging focus control signal.
JP5999681A 1981-04-20 1981-04-20 Control signal detector of optical information reader Granted JPS5774841A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5999681A JPS5774841A (en) 1981-04-20 1981-04-20 Control signal detector of optical information reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5999681A JPS5774841A (en) 1981-04-20 1981-04-20 Control signal detector of optical information reader

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP49031720A Division JPS5123900B2 (en) 1974-03-20 1974-03-20

Publications (2)

Publication Number Publication Date
JPS5774841A true JPS5774841A (en) 1982-05-11
JPS6233650B2 JPS6233650B2 (en) 1987-07-22

Family

ID=13129282

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5999681A Granted JPS5774841A (en) 1981-04-20 1981-04-20 Control signal detector of optical information reader

Country Status (1)

Country Link
JP (1) JPS5774841A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59231739A (en) * 1983-06-14 1984-12-26 Matsushita Electric Ind Co Ltd Focus controller

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59231739A (en) * 1983-06-14 1984-12-26 Matsushita Electric Ind Co Ltd Focus controller

Also Published As

Publication number Publication date
JPS6233650B2 (en) 1987-07-22

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