JPS5680835A - Servo lead-in device for focus lens of optical information reader - Google Patents
Servo lead-in device for focus lens of optical information readerInfo
- Publication number
- JPS5680835A JPS5680835A JP15875779A JP15875779A JPS5680835A JP S5680835 A JPS5680835 A JP S5680835A JP 15875779 A JP15875779 A JP 15875779A JP 15875779 A JP15875779 A JP 15875779A JP S5680835 A JPS5680835 A JP S5680835A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- signal
- servo
- moving speed
- error signal
- 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
- 230000003287 optical effect Effects 0.000 title 1
- 230000002411 adverse Effects 0.000 abstract 1
- 238000005070 sampling Methods 0.000 abstract 1
Landscapes
- Automatic Focus Adjustment (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Abstract
PURPOSE: To ensure a steady and assured focus servo-action, by applying the opposite force to a lens according to the moving speed of the lens when the lens exceeds the desired distance or its vicinity.
CONSTITUTION: The start signal and the servo error signal A are applied to the lens driving motor 4 via the adder circuit 3 and in the form of the positive phase input. The signal A is also turned into the adverse phase input of the motor 4. In such constitution, the lens is driven toward the recording surface, and the error signal A is supplied. The control signal D is delivered to the comparator 11 at the time point when the desired distance of the lens, i.e., the polarity of the error signal is reversed. The sampling switch is closed by the signal D, and the output B having the pulse duration according to the moving speed of the lens of the comparator 6 is applied to the motor 4 as the opposite force via the differentiating circuit 9 and the diode 10. In this instant, the loop switch 2 is opened by the signal D, and the lens is positioned nearly at the right place due to a low moving speed of the lens. As a result, the lock-in action can be performed smoothly for the servo.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15875779A JPS5680835A (en) | 1979-12-07 | 1979-12-07 | Servo lead-in device for focus lens of optical information reader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15875779A JPS5680835A (en) | 1979-12-07 | 1979-12-07 | Servo lead-in device for focus lens of optical information reader |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5680835A true JPS5680835A (en) | 1981-07-02 |
Family
ID=15678669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15875779A Pending JPS5680835A (en) | 1979-12-07 | 1979-12-07 | Servo lead-in device for focus lens of optical information reader |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5680835A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0717401A1 (en) * | 1994-12-16 | 1996-06-19 | Sony Corporation | Apparatus and method for reproducing data from multilayered disks |
-
1979
- 1979-12-07 JP JP15875779A patent/JPS5680835A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0717401A1 (en) * | 1994-12-16 | 1996-06-19 | Sony Corporation | Apparatus and method for reproducing data from multilayered disks |
| US5754507A (en) * | 1994-12-16 | 1998-05-19 | Sony Corporation | Multi-layered optical disk reproducing apparatus with focus search |
| US5835460A (en) * | 1994-12-16 | 1998-11-10 | Sony Corporation | Multi-layered optical disk reproducing method with focus search |
| AU703592B2 (en) * | 1994-12-16 | 1999-03-25 | Sony Corporation | Apparatus and method for reproducing data from multi-layered disk |
| CN1086045C (en) * | 1994-12-16 | 2002-06-05 | 索尼公司 | Apparatus and method for reproducing data from multi-layered disk |
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