JPS6423471A - Track seek device - Google Patents
Track seek deviceInfo
- Publication number
- JPS6423471A JPS6423471A JP18039487A JP18039487A JPS6423471A JP S6423471 A JPS6423471 A JP S6423471A JP 18039487 A JP18039487 A JP 18039487A JP 18039487 A JP18039487 A JP 18039487A JP S6423471 A JPS6423471 A JP S6423471A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- pickup
- speed
- counter
- track
- 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
Landscapes
- Moving Of Head For Track Selection And Changing (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Abstract
PURPOSE:To attain high speed seek operation by generating a pseudo track cross signal so as to calculate the seek speed when a pickup of a signal reproducing means detects an identification part formed with bit form of a track. CONSTITUTION:A track cross signal is outputted from a mono-clock circuit 142 of a signal processing circuit 140 while a difference signal S31 of an optical 2-split detection circuit is generated every time the pickup crosses a track and the signal is fed to a speed counter 151 of a present speed generator 150 via a switching circuit 145. The moving speed of the pickup is controlled in response to the pickup moving present speed outputted from the counter 151 to apply seeking. On the other hand, a correction counter 154 presetting the count of the counter 151 counts down in response to the output of a monostable multivibrator 144 triggered by a sum signal when the pickup crosses the identification part and a borrow signal is a pseudo track cross signal S154 and the speed control is applied without any hindrance even at the crossing of the identification part at the high speed pickup movement. As a result, the high speed seeking is also applied.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18039487A JPH0668889B2 (en) | 1987-07-20 | 1987-07-20 | Track seek equipment |
| US07/221,411 US4989190A (en) | 1987-07-20 | 1988-07-19 | Apparatus for seeking a track of an optical disk in which information is recorded |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18039487A JPH0668889B2 (en) | 1987-07-20 | 1987-07-20 | Track seek equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6423471A true JPS6423471A (en) | 1989-01-26 |
| JPH0668889B2 JPH0668889B2 (en) | 1994-08-31 |
Family
ID=16082468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18039487A Expired - Lifetime JPH0668889B2 (en) | 1987-07-20 | 1987-07-20 | Track seek equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0668889B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5457671A (en) * | 1991-03-19 | 1995-10-10 | Fujitsu Limited | Method and circuit for correcting track zero crossing signal in optical track |
| CN112787660A (en) * | 2020-12-30 | 2021-05-11 | 宗仁科技(平潭)股份有限公司 | Count-up and count-down circuit and counter |
-
1987
- 1987-07-20 JP JP18039487A patent/JPH0668889B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5457671A (en) * | 1991-03-19 | 1995-10-10 | Fujitsu Limited | Method and circuit for correcting track zero crossing signal in optical track |
| CN112787660A (en) * | 2020-12-30 | 2021-05-11 | 宗仁科技(平潭)股份有限公司 | Count-up and count-down circuit and counter |
| CN112787660B (en) * | 2020-12-30 | 2023-09-26 | 宗仁科技(平潭)股份有限公司 | Up-down counting circuit and counter |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0668889B2 (en) | 1994-08-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |