JPS55150141A - Detecting method for control information - Google Patents
Detecting method for control informationInfo
- Publication number
- JPS55150141A JPS55150141A JP5812979A JP5812979A JPS55150141A JP S55150141 A JPS55150141 A JP S55150141A JP 5812979 A JP5812979 A JP 5812979A JP 5812979 A JP5812979 A JP 5812979A JP S55150141 A JPS55150141 A JP S55150141A
- Authority
- JP
- Japan
- Prior art keywords
- way
- circuits
- cosω
- perturbation
- outputs
- 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
- Automatic Focus Adjustment (AREA)
- Optical Recording Or Reproduction (AREA)
- Feedback Control In General (AREA)
- Control Of Position Or Direction (AREA)
Abstract
PURPOSE: To detect two-way mutual position information of high reliability with simple constitution by making it possible to separate each control signal independently by synchronously detecting a response signal in two-way perturbation by a two-way variation signal.
CONSTITUTION: The outputs of sine-wave signal generating circuits 15b and 15a are applied to summing circuits 14a and 14b to move galvano-mirror 5 and a voice- coil type objective lens in mutually-orthogonal directions at cosω1t and cosω2t. Then, a reflected laser beam from video disk 7 is photodetected by photodetector 8 and variation components corresponding to each perturbation are extracted by BFPs 11a and 11b of ω1 and ω2 in center angular frequency and synchronously detected by synchronous detectors 12a and 12b by the use of the outputs of circuits 15a and 15b, so that focus-control and tracking control signals can independently be separated. Consequently, two-way mutual position information of high reliability is detected with the simple constitution.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5812979A JPS55150141A (en) | 1979-05-14 | 1979-05-14 | Detecting method for control information |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5812979A JPS55150141A (en) | 1979-05-14 | 1979-05-14 | Detecting method for control information |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55150141A true JPS55150141A (en) | 1980-11-21 |
Family
ID=13075362
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5812979A Pending JPS55150141A (en) | 1979-05-14 | 1979-05-14 | Detecting method for control information |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55150141A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5317706A (en) * | 1976-08-02 | 1978-02-18 | Philips Nv | Optical recording carrier reader |
-
1979
- 1979-05-14 JP JP5812979A patent/JPS55150141A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5317706A (en) * | 1976-08-02 | 1978-02-18 | Philips Nv | Optical recording carrier reader |
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