JPS5730126A - Optical reproducing device - Google Patents

Optical reproducing device

Info

Publication number
JPS5730126A
JPS5730126A JP10398280A JP10398280A JPS5730126A JP S5730126 A JPS5730126 A JP S5730126A JP 10398280 A JP10398280 A JP 10398280A JP 10398280 A JP10398280 A JP 10398280A JP S5730126 A JPS5730126 A JP S5730126A
Authority
JP
Japan
Prior art keywords
level
monitoring device
reproduced signal
circuit
monitoring
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.)
Pending
Application number
JP10398280A
Other languages
Japanese (ja)
Inventor
Yutaka Oki
Yoshiro Shiroichi
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP10398280A priority Critical patent/JPS5730126A/en
Publication of JPS5730126A publication Critical patent/JPS5730126A/en
Pending 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 Recording Or Reproduction (AREA)

Abstract

PURPOSE:To facilitate focus adjustment by providing a focus servo circuit with a means of adjusting the distance between a disk and an objective lens finely and by making the fine adjustment while monitoring the level of a reproduced signal. CONSTITUTION:A signal detected by a photodetector 6 is amplified by a head amplifier 7 and an amplifier 13, and a DC voltage which corresponds to the level of the reproduced signal is supplied from a rectifying circuit 14 to a monitoring device 12. As this monitoring device 12, a display device, etc., such as a voltmeter, performing step display corresponding to the lighting states of light emitting diodes is used. Even if the influence of secular change, etc., shifts the optical axis of a laser beam and temperature fluctuations, etc., vary the characteristics of circuit elements, focusing circuit is adjusted without using a special measuring instrument, while the monitoring device 12 is viewed, so that the level of the reproduced signal reaches its peak or exceeds a prescribed level.
JP10398280A 1980-07-29 1980-07-29 Optical reproducing device Pending JPS5730126A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10398280A JPS5730126A (en) 1980-07-29 1980-07-29 Optical reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10398280A JPS5730126A (en) 1980-07-29 1980-07-29 Optical reproducing device

Publications (1)

Publication Number Publication Date
JPS5730126A true JPS5730126A (en) 1982-02-18

Family

ID=14368513

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10398280A Pending JPS5730126A (en) 1980-07-29 1980-07-29 Optical reproducing device

Country Status (1)

Country Link
JP (1) JPS5730126A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5090003A (en) * 1988-08-09 1992-02-18 Matsushita Electric Industrial Co., Ltd. Method and apparatus for adjusting target position of focusing of light beam

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5090003A (en) * 1988-08-09 1992-02-18 Matsushita Electric Industrial Co., Ltd. Method and apparatus for adjusting target position of focusing of light beam

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