JPS5538686A - Tracking controller of optical information reader - Google Patents
Tracking controller of optical information readerInfo
- Publication number
- JPS5538686A JPS5538686A JP11268778A JP11268778A JPS5538686A JP S5538686 A JPS5538686 A JP S5538686A JP 11268778 A JP11268778 A JP 11268778A JP 11268778 A JP11268778 A JP 11268778A JP S5538686 A JPS5538686 A JP S5538686A
- Authority
- JP
- Japan
- Prior art keywords
- track
- servo
- irradiation light
- center
- tracking
- 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.)
- Granted
Links
Abstract
PURPOSE:To prevent malfunction of a tracking servo to a defective part of a video track by controlling the switching operation of the servo for a deflecting mirror by detecting a shift of irradiation light of more than a fixed value from the track center. CONSTITUTION:Reproduced light from video disc 7 is detected by respective elements 9a-9d forming photo detecting element 9 and passed through comparing amplifier 10 and low-pass equalizer corresponding to the rotational frequency of the video disc to obtain an error voltage corresponding to the position shift of irradiation light from the track center and tracking deflecting mirror 6 is servocontrolled to make the irradiation light track the track. On the other hand, this error voltage is passed through LPF 15 and then applied to window comparator 16 where high and low reference voltage are set; when the irradiation light shifts from the center of the track in any direction by more than a fixed value, a high-level signal is generated to trigger monostable multivibrator 17, thereby froming the servo-loop of mirror 6. Therefore, malfunction of the servo such as repetitive reproduction of a defective track.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11268778A JPS5538686A (en) | 1978-09-13 | 1978-09-13 | Tracking controller of optical information reader |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11268778A JPS5538686A (en) | 1978-09-13 | 1978-09-13 | Tracking controller of optical information reader |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5538686A true JPS5538686A (en) | 1980-03-18 |
JPS6120929B2 JPS6120929B2 (en) | 1986-05-24 |
Family
ID=14592956
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11268778A Granted JPS5538686A (en) | 1978-09-13 | 1978-09-13 | Tracking controller of optical information reader |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5538686A (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57150144A (en) * | 1981-03-10 | 1982-09-16 | Matsushita Electric Ind Co Ltd | Optical recorder and reproducer |
EP0062464A2 (en) * | 1981-03-31 | 1982-10-13 | Discovision Associates | Tracking system for a reading beam |
US4406000A (en) * | 1981-03-31 | 1983-09-20 | Discovision Associates | Tracking system for optical record medium |
JPS58165955A (en) * | 1982-03-19 | 1983-10-01 | Yamazaki Mazak Corp | Tail stock barrier setting and controlling method in numerically controlled lathe |
JPS58165952A (en) * | 1982-03-19 | 1983-10-01 | Yamazaki Mazak Corp | Tool barrier setting and controlling method in four-spindle numerically controlled lathe |
FR2536196A1 (en) * | 1982-11-11 | 1984-05-18 | Sony Corp | ALARM SERVO CONTROL CIRCUIT FOR OPTICAL REPRODUCTION DEVICE |
JPS59205253A (en) * | 1983-05-02 | 1984-11-20 | Fanuc Ltd | Tool interference checking method for tetraxial lathe |
JPS6044223U (en) * | 1983-08-30 | 1985-03-28 | ソニー株式会社 | Optical disk player head feed control device |
JPS6064416U (en) * | 1983-10-04 | 1985-05-07 | パイオニア株式会社 | Recorded information reading device |
US4803676A (en) * | 1985-03-09 | 1989-02-07 | Deutsche Thomson-Brandt Gmbh | Circuitry for an audio or video disk player |
-
1978
- 1978-09-13 JP JP11268778A patent/JPS5538686A/en active Granted
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0243256B2 (en) * | 1981-03-10 | 1990-09-27 | ||
JPS57150144A (en) * | 1981-03-10 | 1982-09-16 | Matsushita Electric Ind Co Ltd | Optical recorder and reproducer |
EP0062464A2 (en) * | 1981-03-31 | 1982-10-13 | Discovision Associates | Tracking system for a reading beam |
EP0062464A3 (en) * | 1981-03-31 | 1983-03-23 | Discovision Associates | Tracking system for a reading beam |
US4406000A (en) * | 1981-03-31 | 1983-09-20 | Discovision Associates | Tracking system for optical record medium |
JPS58165955A (en) * | 1982-03-19 | 1983-10-01 | Yamazaki Mazak Corp | Tail stock barrier setting and controlling method in numerically controlled lathe |
JPS58165952A (en) * | 1982-03-19 | 1983-10-01 | Yamazaki Mazak Corp | Tool barrier setting and controlling method in four-spindle numerically controlled lathe |
JPH0313021B2 (en) * | 1982-03-19 | 1991-02-21 | Yamazaki Mazak Corp | |
JPH0255181B2 (en) * | 1982-03-19 | 1990-11-26 | Yamazaki Mazak Corp | |
FR2536196A1 (en) * | 1982-11-11 | 1984-05-18 | Sony Corp | ALARM SERVO CONTROL CIRCUIT FOR OPTICAL REPRODUCTION DEVICE |
US4587644A (en) * | 1982-11-11 | 1986-05-06 | Sony Corporation | Tracking servocontrol circuits for reducing gain to avoid tracking defect in an optical reproducing apparatus |
JPS59205253A (en) * | 1983-05-02 | 1984-11-20 | Fanuc Ltd | Tool interference checking method for tetraxial lathe |
JPS6044223U (en) * | 1983-08-30 | 1985-03-28 | ソニー株式会社 | Optical disk player head feed control device |
JPH0216418Y2 (en) * | 1983-08-30 | 1990-05-07 | ||
JPS6064416U (en) * | 1983-10-04 | 1985-05-07 | パイオニア株式会社 | Recorded information reading device |
US4803676A (en) * | 1985-03-09 | 1989-02-07 | Deutsche Thomson-Brandt Gmbh | Circuitry for an audio or video disk player |
Also Published As
Publication number | Publication date |
---|---|
JPS6120929B2 (en) | 1986-05-24 |
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