JPS6474084A - Servo-device - Google Patents

Servo-device

Info

Publication number
JPS6474084A
JPS6474084A JP62227693A JP22769387A JPS6474084A JP S6474084 A JPS6474084 A JP S6474084A JP 62227693 A JP62227693 A JP 62227693A JP 22769387 A JP22769387 A JP 22769387A JP S6474084 A JPS6474084 A JP S6474084A
Authority
JP
Japan
Prior art keywords
servo
signal
gain
light receiving
turbulence
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.)
Pending
Application number
JP62227693A
Other languages
Japanese (ja)
Inventor
Tetsuya 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.)
Denso Ten Ltd
Original Assignee
Denso Ten 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 Denso Ten Ltd filed Critical Denso Ten Ltd
Priority to JP62227693A priority Critical patent/JPS6474084A/en
Publication of JPS6474084A publication Critical patent/JPS6474084A/en
Pending legal-status Critical Current

Links

Landscapes

  • Moving Of The Head To Find And Align With The Track (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

PURPOSE:To perform the better vibration-proof servo by reducing the gain of a servo-signal when the turbulence comes to the servo-signal. CONSTITUTION:A light receiving element 3 is divided into four light receiving parts A-D, and the output signals of each of the light receiving parts A-D are given to each of the amplifiers 4-7. The output signals (a)-(d) from the amplifiers 4-7 are given to a focusing error detection circuit 20. And, when the turbulence comes to a servo-signal, the gain switching circuits 29-41 are operated and the gain of the servo-signal is reduced. Accordingly, the generation of servo-error is prevented, and at the same time, the better vibration-proof servo can be performed by the servo-signal with high gain in the normal time when the turbulence does not come to the servo-signal.
JP62227693A 1987-09-10 1987-09-10 Servo-device Pending JPS6474084A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62227693A JPS6474084A (en) 1987-09-10 1987-09-10 Servo-device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62227693A JPS6474084A (en) 1987-09-10 1987-09-10 Servo-device

Publications (1)

Publication Number Publication Date
JPS6474084A true JPS6474084A (en) 1989-03-20

Family

ID=16864866

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62227693A Pending JPS6474084A (en) 1987-09-10 1987-09-10 Servo-device

Country Status (1)

Country Link
JP (1) JPS6474084A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0863763A (en) * 1994-08-25 1996-03-08 Fujitsu Ten Ltd Optical disk reproducing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0863763A (en) * 1994-08-25 1996-03-08 Fujitsu Ten Ltd Optical disk reproducing device

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