JPS6474084A - Servo-device - Google Patents
Servo-deviceInfo
- 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
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.
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0863763A (en) * | 1994-08-25 | 1996-03-08 | Fujitsu Ten Ltd | Optical disk reproducing device |
-
1987
- 1987-09-10 JP JP62227693A patent/JPS6474084A/en active Pending
Cited By (1)
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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