JPS61117736A - 自動焦点制御装置 - Google Patents

自動焦点制御装置

Info

Publication number
JPS61117736A
JPS61117736A JP59239751A JP23975184A JPS61117736A JP S61117736 A JPS61117736 A JP S61117736A JP 59239751 A JP59239751 A JP 59239751A JP 23975184 A JP23975184 A JP 23975184A JP S61117736 A JPS61117736 A JP S61117736A
Authority
JP
Japan
Prior art keywords
output
circuit
phase lead
lead compensation
pull
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
JP59239751A
Other languages
English (en)
Japanese (ja)
Other versions
JPH0548531B2 (enExample
Inventor
Seizo Tsuji
辻　誠三
Tsuneo Takahashi
恒夫 高橋
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP59239751A priority Critical patent/JPS61117736A/ja
Publication of JPS61117736A publication Critical patent/JPS61117736A/ja
Publication of JPH0548531B2 publication Critical patent/JPH0548531B2/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

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
JP59239751A 1984-11-13 1984-11-13 自動焦点制御装置 Granted JPS61117736A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59239751A JPS61117736A (ja) 1984-11-13 1984-11-13 自動焦点制御装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59239751A JPS61117736A (ja) 1984-11-13 1984-11-13 自動焦点制御装置

Publications (2)

Publication Number Publication Date
JPS61117736A true JPS61117736A (ja) 1986-06-05
JPH0548531B2 JPH0548531B2 (enExample) 1993-07-21

Family

ID=17049382

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59239751A Granted JPS61117736A (ja) 1984-11-13 1984-11-13 自動焦点制御装置

Country Status (1)

Country Link
JP (1) JPS61117736A (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63177322A (ja) * 1986-12-27 1988-07-21 Alpine Electron Inc フオ−カスサ−ボ回路

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63177322A (ja) * 1986-12-27 1988-07-21 Alpine Electron Inc フオ−カスサ−ボ回路

Also Published As

Publication number Publication date
JPH0548531B2 (enExample) 1993-07-21

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Legal Events

Date Code Title Description
EXPY Cancellation because of completion of term