JPS641172A - Displacement correcting servo device for pickup element - Google Patents
Displacement correcting servo device for pickup elementInfo
- Publication number
- JPS641172A JPS641172A JP15495087A JP15495087A JPS641172A JP S641172 A JPS641172 A JP S641172A JP 15495087 A JP15495087 A JP 15495087A JP 15495087 A JP15495087 A JP 15495087A JP S641172 A JPS641172 A JP S641172A
- Authority
- JP
- Japan
- Prior art keywords
- gains
- focus
- tracking
- pickup element
- servo device
- 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
Abstract
PURPOSE: To prevent a device from malfunctioning by varying the gain of a focus servocontrol circuit or tracking servocontrol circuit according to the level of a focus or tracking error signal.
CONSTITUTION: Focus and tracking gain controlling circuits 12 and 13 are capable of switching gains respectively and set to standard gains, but the gains of the servo circuits 12 and 13 are made large when the error signals FE and TE are large and small when the error signals FE and TE are small, thereby performing proper operation according to the circumstances. Consequently, the best operation conditions are decided, malfunction due to vibrations, etc., is reducible without deteriorating flaw passing characteristics of a disk in a stationary state, and the servo gains are easily set.
COPYRIGHT: (C)1989,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62-154950A JPH011172A (en) | 1987-06-22 | Pickup element displacement correction servo device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62-154950A JPH011172A (en) | 1987-06-22 | Pickup element displacement correction servo device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS641172A true JPS641172A (en) | 1989-01-05 |
JPH011172A JPH011172A (en) | 1989-01-05 |
Family
ID=
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5357496A (en) * | 1992-02-27 | 1994-10-18 | Fujitsu Limited | Optical disk drive focus servo control system with focus servo being turned off or having gain reduced after tracking servo has been off a predetermined time period |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5938936A (en) * | 1982-08-28 | 1984-03-03 | Sony Corp | Servo control circuit of information reproducer |
JPS61292227A (en) * | 1985-06-18 | 1986-12-23 | Mitsubishi Electric Corp | Optical disc device |
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5938936A (en) * | 1982-08-28 | 1984-03-03 | Sony Corp | Servo control circuit of information reproducer |
JPS61292227A (en) * | 1985-06-18 | 1986-12-23 | Mitsubishi Electric Corp | Optical disc device |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5357496A (en) * | 1992-02-27 | 1994-10-18 | Fujitsu Limited | Optical disk drive focus servo control system with focus servo being turned off or having gain reduced after tracking servo has been off a predetermined time period |
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