JPH0467257B2 - - Google Patents

Info

Publication number
JPH0467257B2
JPH0467257B2 JP24875683A JP24875683A JPH0467257B2 JP H0467257 B2 JPH0467257 B2 JP H0467257B2 JP 24875683 A JP24875683 A JP 24875683A JP 24875683 A JP24875683 A JP 24875683A JP H0467257 B2 JPH0467257 B2 JP H0467257B2
Authority
JP
Japan
Prior art keywords
focus
circuit
voltage
error signal
output
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.)
Expired
Application number
JP24875683A
Other languages
English (en)
Japanese (ja)
Other versions
JPS60138739A (ja
Inventor
Shuichi Kimura
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 JP24875683A priority Critical patent/JPS60138739A/ja
Publication of JPS60138739A publication Critical patent/JPS60138739A/ja
Publication of JPH0467257B2 publication Critical patent/JPH0467257B2/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

  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Automatic Focus Adjustment (AREA)
JP24875683A 1983-12-27 1983-12-27 光学式デイスクプレ−ヤ−のフオ−カスサ−ボ回路 Granted JPS60138739A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24875683A JPS60138739A (ja) 1983-12-27 1983-12-27 光学式デイスクプレ−ヤ−のフオ−カスサ−ボ回路

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24875683A JPS60138739A (ja) 1983-12-27 1983-12-27 光学式デイスクプレ−ヤ−のフオ−カスサ−ボ回路

Publications (2)

Publication Number Publication Date
JPS60138739A JPS60138739A (ja) 1985-07-23
JPH0467257B2 true JPH0467257B2 (en]) 1992-10-27

Family

ID=17182905

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24875683A Granted JPS60138739A (ja) 1983-12-27 1983-12-27 光学式デイスクプレ−ヤ−のフオ−カスサ−ボ回路

Country Status (1)

Country Link
JP (1) JPS60138739A (en])

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6290419U (en]) * 1985-11-22 1987-06-10
JPS63285730A (ja) * 1987-05-19 1988-11-22 Hitachi Ltd 光ディスク装置の自動焦点制御方法

Also Published As

Publication number Publication date
JPS60138739A (ja) 1985-07-23

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees