JPS6450243A - Optical disk recording and reproducing device - Google Patents
Optical disk recording and reproducing deviceInfo
- Publication number
- JPS6450243A JPS6450243A JP20724987A JP20724987A JPS6450243A JP S6450243 A JPS6450243 A JP S6450243A JP 20724987 A JP20724987 A JP 20724987A JP 20724987 A JP20724987 A JP 20724987A JP S6450243 A JPS6450243 A JP S6450243A
- Authority
- JP
- Japan
- Prior art keywords
- tracking
- error signal
- tracking error
- phase compensation
- recording operation
- 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 perform normal tracking control even in a recording operation, by performing the tracking control based on a tracking error signal obtained by a push-pull method in the recording operation and the tracking error signal obtained by a three-beam method in a reproducing operation. CONSTITUTION:The detecting signal of a main laser beam detected by the photodetector 3 of an optical head 2 and the detecting signals of two sub laser beams are inputted to a tracking error signal detection circuit 10, and the tracking error signal by the push-pull method based on those detecting signals is inputted to a first phase compensation circuit 11, and the tracking error signal by the three-beam method to a second phase compensation circuit 12, then, a phase compensation processing is applied, respectively. In the recording operation and the reproducing operation, an offset or a gain required for the correct operation of an actuator 8 for tracking is adjusted, and either on one side of the signals obtained at those phase compensation circuits 11 and 12 is switched by a switching means 13, and is fed back to the actuator 8 for tracking. In such a way, it is possible to perform the tracking control normally even in the recording operation.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20724987A JPS6450243A (en) | 1987-08-20 | 1987-08-20 | Optical disk recording and reproducing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20724987A JPS6450243A (en) | 1987-08-20 | 1987-08-20 | Optical disk recording and reproducing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6450243A true JPS6450243A (en) | 1989-02-27 |
Family
ID=16536680
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20724987A Pending JPS6450243A (en) | 1987-08-20 | 1987-08-20 | Optical disk recording and reproducing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6450243A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11527130B2 (en) | 2015-08-03 | 2022-12-13 | Angel Group Co., Ltd. | Fraud detection system in a casino |
-
1987
- 1987-08-20 JP JP20724987A patent/JPS6450243A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11527130B2 (en) | 2015-08-03 | 2022-12-13 | Angel Group Co., Ltd. | Fraud detection system in a casino |
US11527131B2 (en) | 2015-08-03 | 2022-12-13 | Angel Group Co., Ltd. | Fraud detection system in a casino |
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