JPS6326462B2 - - Google Patents

Info

Publication number
JPS6326462B2
JPS6326462B2 JP55052515A JP5251580A JPS6326462B2 JP S6326462 B2 JPS6326462 B2 JP S6326462B2 JP 55052515 A JP55052515 A JP 55052515A JP 5251580 A JP5251580 A JP 5251580A JP S6326462 B2 JPS6326462 B2 JP S6326462B2
Authority
JP
Japan
Prior art keywords
voltage
output
distance
focus control
record carrier
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
JP55052515A
Other languages
English (en)
Japanese (ja)
Other versions
JPS56148747A (en
Inventor
Kazuo Hirasawa
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 JP5251580A priority Critical patent/JPS56148747A/ja
Publication of JPS56148747A publication Critical patent/JPS56148747A/ja
Publication of JPS6326462B2 publication Critical patent/JPS6326462B2/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)
JP5251580A 1980-04-18 1980-04-18 Focus controller Granted JPS56148747A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5251580A JPS56148747A (en) 1980-04-18 1980-04-18 Focus controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5251580A JPS56148747A (en) 1980-04-18 1980-04-18 Focus controller

Publications (2)

Publication Number Publication Date
JPS56148747A JPS56148747A (en) 1981-11-18
JPS6326462B2 true JPS6326462B2 (enrdf_load_stackoverflow) 1988-05-30

Family

ID=12916866

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5251580A Granted JPS56148747A (en) 1980-04-18 1980-04-18 Focus controller

Country Status (1)

Country Link
JP (1) JPS56148747A (enrdf_load_stackoverflow)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60629A (ja) * 1983-06-16 1985-01-05 Sanyo Electric Co Ltd フオ−カスサ−ボ引き込み回路
JPH0749619Y2 (ja) * 1984-08-24 1995-11-13 パイオニア株式会社 光学的情報再生装置
JP2548110B2 (ja) * 1984-11-16 1996-10-30 松下電器産業株式会社 焦点位置制御装置
DE3508525A1 (de) * 1985-03-09 1986-09-11 Thomson Brandt Gmbh Fokus-such-einrichtung fuer beruehrungslose abtastung
JPH09542U (ja) * 1997-04-17 1997-11-11 パイオニア株式会社 光学的情報再生装置

Also Published As

Publication number Publication date
JPS56148747A (en) 1981-11-18

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