JPS56148747A - Focus controller - Google Patents

Focus controller

Info

Publication number
JPS56148747A
JPS56148747A JP5251580A JP5251580A JPS56148747A JP S56148747 A JPS56148747 A JP S56148747A JP 5251580 A JP5251580 A JP 5251580A JP 5251580 A JP5251580 A JP 5251580A JP S56148747 A JPS56148747 A JP S56148747A
Authority
JP
Japan
Prior art keywords
condenser lens
interval
supplied
generator
switch
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
JP5251580A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6326462B2 (enrdf_load_stackoverflow
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 true JPS56148747A (en) 1981-11-18
JPS6326462B2 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)

Cited By (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
JPS6145725U (ja) * 1984-08-24 1986-03-26 パイオニア株式会社 光学的情報記録再生装置
JPS61122937A (ja) * 1984-11-16 1986-06-10 Matsushita Electric Ind Co Ltd 焦点位置制御装置
JPS62501998A (ja) * 1985-03-09 1987-08-06 ドイチエ　トムソン−ブラント　ゲゼルシヤフト　ミツト　ベシユレンクテル　ハフツング 光学的な記録担体に対してビ−ムを集束する方法および回路装置
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

Cited By (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
JPS6145725U (ja) * 1984-08-24 1986-03-26 パイオニア株式会社 光学的情報記録再生装置
JPS61122937A (ja) * 1984-11-16 1986-06-10 Matsushita Electric Ind Co Ltd 焦点位置制御装置
JPS62501998A (ja) * 1985-03-09 1987-08-06 ドイチエ　トムソン−ブラント　ゲゼルシヤフト　ミツト　ベシユレンクテル　ハフツング 光学的な記録担体に対してビ−ムを集束する方法および回路装置
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
JPS6326462B2 (enrdf_load_stackoverflow) 1988-05-30

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