JPS6452232A - Focus control method for optical disk device - Google Patents
Focus control method for optical disk deviceInfo
- Publication number
- JPS6452232A JPS6452232A JP20813687A JP20813687A JPS6452232A JP S6452232 A JPS6452232 A JP S6452232A JP 20813687 A JP20813687 A JP 20813687A JP 20813687 A JP20813687 A JP 20813687A JP S6452232 A JPS6452232 A JP S6452232A
- Authority
- JP
- Japan
- Prior art keywords
- cpu
- servo
- focus servo
- optical disk
- sampling system
- 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
- Optical Recording Or Reproduction (AREA)
Abstract
PURPOSE:To attain stable focus control by switching a focus servo system of a sampling system to a continuous focus servo system at the time of accessing and controlling the disk by the sampling system at the time of conventional recording and reproduction. CONSTITUTION:In an optical disk device using an optical disk 11 where a servo control area and a recording/reproducing area are provided separately in advance, focus servo is operated by the control of a CPU 23 and the disk is controlled so that output voltages of photodetectors 12, 13 are equal to each other. Then the CPU 23 changes over a servo changeover switch 22 to the position B to activate the sampling system focus servo. When an access instruction is transferred from a host computer 24 to the CPU 23, the CPU 23 changes over the servo changeover switch 22 to the position A to activate the continuous focus servo. When the access is finished, the CPU 23 activates again the sampling system focus servo.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20813687A JPS6452232A (en) | 1987-08-24 | 1987-08-24 | Focus control method for optical disk device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20813687A JPS6452232A (en) | 1987-08-24 | 1987-08-24 | Focus control method for optical disk device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6452232A true JPS6452232A (en) | 1989-02-28 |
Family
ID=16551229
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20813687A Pending JPS6452232A (en) | 1987-08-24 | 1987-08-24 | Focus control method for optical disk device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6452232A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5004581A (en) * | 1989-07-31 | 1991-04-02 | Toyota Jidosha Kabushiki Kaisha | Dispersion strengthened copper-base alloy for overlay |
JPH05250705A (en) * | 1992-03-06 | 1993-09-28 | Victor Co Of Japan Ltd | Focus error signal automatic correcting circuit |
-
1987
- 1987-08-24 JP JP20813687A patent/JPS6452232A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5004581A (en) * | 1989-07-31 | 1991-04-02 | Toyota Jidosha Kabushiki Kaisha | Dispersion strengthened copper-base alloy for overlay |
JPH05250705A (en) * | 1992-03-06 | 1993-09-28 | Victor Co Of Japan Ltd | Focus error signal automatic correcting circuit |
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