JPS6488930A - Servo signal extracting circuit - Google Patents
Servo signal extracting circuitInfo
- Publication number
- JPS6488930A JPS6488930A JP24543987A JP24543987A JPS6488930A JP S6488930 A JPS6488930 A JP S6488930A JP 24543987 A JP24543987 A JP 24543987A JP 24543987 A JP24543987 A JP 24543987A JP S6488930 A JPS6488930 A JP S6488930A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- laser beam
- angle
- signal
- horizontal synchronizing
- 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 miniaturize and simplify a device by sampling a synchronizing signal part, detecting angle information between a disk surface and a laser beam, controlling the angle of a reflecting mirror, and controlling the angle of the laser beam. CONSTITUTION:A laser beam emitted from a laser beam generator 311 is reflected by a radial mirror 312 and a disk 30 is irradiated through an objective lens 313. The reflecting light is reversed and made incident on a photodetector 314. For a photo-electrically converted higher harmonic signal, a horizontal synchronizing signal is extracted through a higher harmonic amplifier 32 with a BPF 40, the signal is synchronized to the horizontal synchronizing signal from a horizontal synchronizing circuit 43 through a detecting amplifying circuit 41 and sample-held by a sample-hold circuit 42. The output signal of the circuit 42 in accordance with the angle of a disk surface and a laser beam is inputted through an equalizer circuit 43 and a prescribed frequency component is inputted to a driving circuit 44. The circuit 44 applies a driving voltage to a voice coil and changes the angle of the radial mirror 312.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24543987A JPS6488930A (en) | 1987-09-29 | 1987-09-29 | Servo signal extracting circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24543987A JPS6488930A (en) | 1987-09-29 | 1987-09-29 | Servo signal extracting circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6488930A true JPS6488930A (en) | 1989-04-03 |
Family
ID=17133679
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24543987A Pending JPS6488930A (en) | 1987-09-29 | 1987-09-29 | Servo signal extracting circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6488930A (en) |
-
1987
- 1987-09-29 JP JP24543987A patent/JPS6488930A/en active Pending
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