JPS57169932A - Automatic tracking system for optical disc - Google Patents
Automatic tracking system for optical discInfo
- Publication number
- JPS57169932A JPS57169932A JP5311781A JP5311781A JPS57169932A JP S57169932 A JPS57169932 A JP S57169932A JP 5311781 A JP5311781 A JP 5311781A JP 5311781 A JP5311781 A JP 5311781A JP S57169932 A JPS57169932 A JP S57169932A
- Authority
- JP
- Japan
- Prior art keywords
- tracking
- adder
- output
- integrating
- tracking control
- 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 achieve always stable tracking control, by integrating a tracking error signal at an integrating network having sufficiently longer electric discharge time constant and performing a tracking control with the integrated voltage at the point of time when a dropout takes place. CONSTITUTION:A reading beam from a laser light source 1 is condensed on a track of a disc 4 by an objective lens 3, and the reflected light is made incident to a photodetector 7 via a half mirror 3. The output of photosensors 7A and 7C is applied to an adder 8 and the output of photosensors 7B and 7D is applied to an adder 9. The output is applied to an adder 10 and a subtractor 11 and a reproducing RF signal and tracking information are respectively obtained. The tracking information is held at a sample holding circuit 13 with a pulse from a sampling pulse generator 14 with the reproducing RF signal phase-shifted at a phase shift circuit 12 and applied to a tracking driving mechanism 6 via an integration network 16, a changeover switch 15 and an amplifier 17. Since the integrating network 16 with longer time constant is used, always stable tracking control can be achieved.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5311781A JPS57169932A (en) | 1981-04-10 | 1981-04-10 | Automatic tracking system for optical disc |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5311781A JPS57169932A (en) | 1981-04-10 | 1981-04-10 | Automatic tracking system for optical disc |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57169932A true JPS57169932A (en) | 1982-10-19 |
Family
ID=12933852
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5311781A Pending JPS57169932A (en) | 1981-04-10 | 1981-04-10 | Automatic tracking system for optical disc |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57169932A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5999221U (en) * | 1982-12-20 | 1984-07-05 | 日本圧電気株式会社 | Control circuit for optical deflection device |
FR2542902A1 (en) * | 1983-03-14 | 1984-09-21 | Sony Corp | TRACK ALIGNMENT CONTROL DEVICE FOR OPTICAL DISK DRIVE |
JPS6113446A (en) * | 1984-06-29 | 1986-01-21 | Pioneer Electronic Corp | Error signal generating device |
JPS6275937A (en) * | 1985-09-27 | 1987-04-07 | Fujitsu Ten Ltd | Optical reading control device |
EP0330476A2 (en) * | 1988-02-25 | 1989-08-30 | Canon Kabushiki Kaisha | Optical information processing apparatus for stopping tracking and/or focusing controls in an area having preformat signal recorded therein |
JPH02152026A (en) * | 1988-12-05 | 1990-06-12 | Fujitsu Ltd | Track error detecting circuit for optical disk device of sample servo system |
JPH02152025A (en) * | 1988-12-05 | 1990-06-12 | Fujitsu Ltd | Track error detecting circuit for optical disk device of sample servo system |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS533305A (en) * | 1976-06-30 | 1978-01-13 | Mitsubishi Electric Corp | Optical reproduction device |
-
1981
- 1981-04-10 JP JP5311781A patent/JPS57169932A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS533305A (en) * | 1976-06-30 | 1978-01-13 | Mitsubishi Electric Corp | Optical reproduction device |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5999221U (en) * | 1982-12-20 | 1984-07-05 | 日本圧電気株式会社 | Control circuit for optical deflection device |
FR2542902A1 (en) * | 1983-03-14 | 1984-09-21 | Sony Corp | TRACK ALIGNMENT CONTROL DEVICE FOR OPTICAL DISK DRIVE |
JPS6113446A (en) * | 1984-06-29 | 1986-01-21 | Pioneer Electronic Corp | Error signal generating device |
JPS6275937A (en) * | 1985-09-27 | 1987-04-07 | Fujitsu Ten Ltd | Optical reading control device |
EP0330476A2 (en) * | 1988-02-25 | 1989-08-30 | Canon Kabushiki Kaisha | Optical information processing apparatus for stopping tracking and/or focusing controls in an area having preformat signal recorded therein |
JPH02152026A (en) * | 1988-12-05 | 1990-06-12 | Fujitsu Ltd | Track error detecting circuit for optical disk device of sample servo system |
JPH02152025A (en) * | 1988-12-05 | 1990-06-12 | Fujitsu Ltd | Track error detecting circuit for optical disk device of sample servo system |
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