JPS56159844A - Focus control device - Google Patents

Focus control device

Info

Publication number
JPS56159844A
JPS56159844A JP6246880A JP6246880A JPS56159844A JP S56159844 A JPS56159844 A JP S56159844A JP 6246880 A JP6246880 A JP 6246880A JP 6246880 A JP6246880 A JP 6246880A JP S56159844 A JPS56159844 A JP S56159844A
Authority
JP
Japan
Prior art keywords
range
focus control
pulselike
spacing
disc
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
JP6246880A
Other languages
Japanese (ja)
Other versions
JPS6126138B2 (en
Inventor
Kazuo Hirasawa
Mitsushige 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 JP6246880A priority Critical patent/JPS56159844A/en
Publication of JPS56159844A publication Critical patent/JPS56159844A/en
Publication of JPS6126138B2 publication Critical patent/JPS6126138B2/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
    • G11B7/0945—Methods for initialising servos, start-up sequences

Abstract

PURPOSE:To pull-in the spacing between a condenser lens and a disc surely and automatically within a controllable range by applying a pulselike output of which the electric energy changes successively and stepwise to a condenser lens driving device thereby accomplishing focus control operation. CONSTITUTION:Whether the spacing between a condenser lens 4 and a disc 5 is within a pulling-in range where focus control operation can be made or not is detected 1. If this spacing is not within the said range, the pulselike output of which the electric energy changes successively and stepwise at every generation period is applied 8 to the moving means 2, 3 of the lens 4, thereby bringing the distance between the lens 4 and the disc 5 gradually within the said range. According to the entry of the distance between both within the said range, the supply of the pulselike output to the means 2, 3 is prohibited and ordinary focus control is accomplished.
JP6246880A 1980-05-09 1980-05-09 Focus control device Granted JPS56159844A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6246880A JPS56159844A (en) 1980-05-09 1980-05-09 Focus control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6246880A JPS56159844A (en) 1980-05-09 1980-05-09 Focus control device

Publications (2)

Publication Number Publication Date
JPS56159844A true JPS56159844A (en) 1981-12-09
JPS6126138B2 JPS6126138B2 (en) 1986-06-19

Family

ID=13201057

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6246880A Granted JPS56159844A (en) 1980-05-09 1980-05-09 Focus control device

Country Status (1)

Country Link
JP (1) JPS56159844A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS595440A (en) * 1982-06-30 1984-01-12 Nec Home Electronics Ltd Focus servo-circuit of optical pickup
WO1986005306A1 (en) * 1985-03-09 1986-09-12 Deutsche Thomson-Brandt Gmbh Process and circuit arrangement for focussing a light beam onto an optical recording medium

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS595440A (en) * 1982-06-30 1984-01-12 Nec Home Electronics Ltd Focus servo-circuit of optical pickup
WO1986005306A1 (en) * 1985-03-09 1986-09-12 Deutsche Thomson-Brandt Gmbh Process and circuit arrangement for focussing a light beam onto an optical recording medium
EP0432658A2 (en) * 1985-03-09 1991-06-19 Deutsche Thomson-Brandt GmbH Method of focussing a light beam onto an optical record carrier

Also Published As

Publication number Publication date
JPS6126138B2 (en) 1986-06-19

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