JPS57113430A - Focus servo leading-device - Google Patents

Focus servo leading-device

Info

Publication number
JPS57113430A
JPS57113430A JP18866280A JP18866280A JPS57113430A JP S57113430 A JPS57113430 A JP S57113430A JP 18866280 A JP18866280 A JP 18866280A JP 18866280 A JP18866280 A JP 18866280A JP S57113430 A JPS57113430 A JP S57113430A
Authority
JP
Japan
Prior art keywords
focus servo
amplifier
signal
switch
closed
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
JP18866280A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6218972B2 (en, 2012
Inventor
Shunji Harikae
Tomio Yoshida
Akifumi Nakada
Michiyoshi Nagashima
Toshio Sato
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 JP18866280A priority Critical patent/JPS57113430A/ja
Publication of JPS57113430A publication Critical patent/JPS57113430A/ja
Publication of JPS6218972B2 publication Critical patent/JPS6218972B2/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)
JP18866280A 1980-12-29 1980-12-29 Focus servo leading-device Granted JPS57113430A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18866280A JPS57113430A (en) 1980-12-29 1980-12-29 Focus servo leading-device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18866280A JPS57113430A (en) 1980-12-29 1980-12-29 Focus servo leading-device

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP20461586A Division JPS6297139A (ja) 1986-08-29 1986-08-29 フオ−カスサ−ボ引き込み装置

Publications (2)

Publication Number Publication Date
JPS57113430A true JPS57113430A (en) 1982-07-14
JPS6218972B2 JPS6218972B2 (en, 2012) 1987-04-25

Family

ID=16227647

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18866280A Granted JPS57113430A (en) 1980-12-29 1980-12-29 Focus servo leading-device

Country Status (1)

Country Link
JP (1) JPS57113430A (en, 2012)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59116941A (ja) * 1982-12-23 1984-07-06 Matsushita Electric Ind Co Ltd 記録面検出回路
JPS6164621U (en, 2012) * 1984-09-29 1986-05-02
JPS61175936A (ja) * 1985-01-29 1986-08-07 Nec Corp 光学式情報記録装置におけるフオーカスサーボ装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5538639A (en) * 1978-09-07 1980-03-18 Pioneer Video Corp Servo drawing-in unit for focus lens of optical information reader
JPS574035U (en, 2012) * 1980-06-03 1982-01-09

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5538639A (en) * 1978-09-07 1980-03-18 Pioneer Video Corp Servo drawing-in unit for focus lens of optical information reader
JPS574035U (en, 2012) * 1980-06-03 1982-01-09

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59116941A (ja) * 1982-12-23 1984-07-06 Matsushita Electric Ind Co Ltd 記録面検出回路
JPS6164621U (en, 2012) * 1984-09-29 1986-05-02
JPS61175936A (ja) * 1985-01-29 1986-08-07 Nec Corp 光学式情報記録装置におけるフオーカスサーボ装置

Also Published As

Publication number Publication date
JPS6218972B2 (en, 2012) 1987-04-25

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