JPS5744234A - Optical servo device - Google Patents

Optical servo device

Info

Publication number
JPS5744234A
JPS5744234A JP55118934A JP11893480A JPS5744234A JP S5744234 A JPS5744234 A JP S5744234A JP 55118934 A JP55118934 A JP 55118934A JP 11893480 A JP11893480 A JP 11893480A JP S5744234 A JPS5744234 A JP S5744234A
Authority
JP
Japan
Prior art keywords
envelope
circuit
servo device
optical servo
signal
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
JP55118934A
Other languages
Japanese (ja)
Other versions
JPS6141049B2 (en
Inventor
Kazuo Okada
Fumiaki Kondo
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 JP55118934A priority Critical patent/JPS5744234A/en
Publication of JPS5744234A publication Critical patent/JPS5744234A/en
Publication of JPS6141049B2 publication Critical patent/JPS6141049B2/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

Abstract

PURPOSE:To realize a simple and compact structure for an optical servo device, by detecting an error signal from the change of envelope of the reflected light given from an information recording surface and controlling the position of a light spot. CONSTITUTION:The beams sent from a laser beam source 1 are focused 7 on a track 9 on a disk 8 via a tracking mirror 4 and an objective lens 8. This reflected light is supplied to a photodetector 10, and the output of this detector is applied to a sampling circuit 62 via an envelope wave detector 60 and an A/D converter 61. A counter 70 starts counting with a timing pulse given from a timing pulse generating circuit 69, and at the same time an envelope signal Sn is delivered from the circuit 62. The difference between the signal Sn and the initial value Sn-1 of a shift register 63 is supplied to a logical circuit 64. A control degree DELTAn is delivered via a multiplier 64, and the mirror 4 is controlled via an A/D converter 66, an integral network 67 and an actuator 5. As a result, an optical servo device can be simplified and also miniaturized.
JP55118934A 1980-08-27 1980-08-27 Optical servo device Granted JPS5744234A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55118934A JPS5744234A (en) 1980-08-27 1980-08-27 Optical servo device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55118934A JPS5744234A (en) 1980-08-27 1980-08-27 Optical servo device

Publications (2)

Publication Number Publication Date
JPS5744234A true JPS5744234A (en) 1982-03-12
JPS6141049B2 JPS6141049B2 (en) 1986-09-12

Family

ID=14748832

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55118934A Granted JPS5744234A (en) 1980-08-27 1980-08-27 Optical servo device

Country Status (1)

Country Link
JP (1) JPS5744234A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59501233A (en) * 1982-06-30 1984-07-12 イ−ストマン・コダック・カンパニ− Focusing and tracking control device for optical disc writing/reading
EP0138275A2 (en) * 1983-10-17 1985-04-24 Koninklijke Philips Electronics N.V. Apparatus for reproducing information from an optically readable record carrier
JPS6116075A (en) * 1984-07-02 1986-01-24 Fuji Photo Film Co Ltd Tracking device for rotary magnetic recording medium
US4803676A (en) * 1985-03-09 1989-02-07 Deutsche Thomson-Brandt Gmbh Circuitry for an audio or video disk player

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59501233A (en) * 1982-06-30 1984-07-12 イ−ストマン・コダック・カンパニ− Focusing and tracking control device for optical disc writing/reading
EP0138275A2 (en) * 1983-10-17 1985-04-24 Koninklijke Philips Electronics N.V. Apparatus for reproducing information from an optically readable record carrier
JPS6116075A (en) * 1984-07-02 1986-01-24 Fuji Photo Film Co Ltd Tracking device for rotary magnetic recording medium
US4803676A (en) * 1985-03-09 1989-02-07 Deutsche Thomson-Brandt Gmbh Circuitry for an audio or video disk player

Also Published As

Publication number Publication date
JPS6141049B2 (en) 1986-09-12

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