JPS6478439A - Optical information recording and reproducing device - Google Patents
Optical information recording and reproducing deviceInfo
- Publication number
- JPS6478439A JPS6478439A JP23494387A JP23494387A JPS6478439A JP S6478439 A JPS6478439 A JP S6478439A JP 23494387 A JP23494387 A JP 23494387A JP 23494387 A JP23494387 A JP 23494387A JP S6478439 A JPS6478439 A JP S6478439A
- Authority
- JP
- Japan
- Prior art keywords
- servo
- focusing
- lead
- leading
- overshoot
- 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
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Abstract
PURPOSE:To make an overshoot after leading in a servo small and to stably execute a servo lead-in by operating a positional servo after making the relative moving speed of an optical beam spot and a recording medium small when leading in a focusing servo, etc. CONSTITUTION:In a focusing control circuit, a chopping wave generating circuit 306, etc., to be able to stop the change of a chopping wave C by a signal E from a focusing controller 305 are provided. At the time of detecting a servo lead-in position in the lead-in action of a tracking servo and/or focusing servo, the condition of the moving means of the optical beam spot is fixed and at a fixed time, the loop of the tracking servo and/or focusing servo is closed. Thus, the overshoot after leading in the servo can be made about zero and the servo lead-in can be stably executed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23494387A JPS6478439A (en) | 1987-09-21 | 1987-09-21 | Optical information recording and reproducing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23494387A JPS6478439A (en) | 1987-09-21 | 1987-09-21 | Optical information recording and reproducing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6478439A true JPS6478439A (en) | 1989-03-23 |
Family
ID=16978698
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23494387A Pending JPS6478439A (en) | 1987-09-21 | 1987-09-21 | Optical information recording and reproducing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6478439A (en) |
-
1987
- 1987-09-21 JP JP23494387A patent/JPS6478439A/en active Pending
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS5658141A (en) | Tracking servo read-in device for information reader | |
JPS57181436A (en) | Optical disc device | |
JPS57162137A (en) | Photomagnetic recording and reproducing system | |
EP0349439A3 (en) | System for obtaining optimum focusing position in optical disc system | |
US5241522A (en) | Optical disk apparatus using transition control between positioner seek control and lens seek control | |
JPS6430025A (en) | Recording and reproducing device | |
JPS5345506A (en) | Information detecting apparatus | |
DE3784326D1 (en) | TRACKING SYSTEMS FOR OPTICAL TURNTABLE. | |
EP0270365A1 (en) | Servo circuits for optical disc information recording and/or reproducing apparatus | |
KR910006935A (en) | Track access control circuit of optical disk device | |
JPS6437729A (en) | Optical information recording and reproducing device | |
JPS57120275A (en) | Tracking servo lead-in system of recorded information reader | |
KR870006556A (en) | Tracking Servo Control | |
JPS5313309A (en) | Optically reproducing unit | |
EP0331475A3 (en) | Optical information processing apparatus with peak hold circuit for gain control signal | |
MY104528A (en) | Optical disc servo apparatus. | |
JPS6478439A (en) | Optical information recording and reproducing device | |
US4989194A (en) | Optical information processing method of driving auto-focusing and/or auto-tracking means in accordance with a stored servo signal when irradiation of a record medium with light beam is stopped, and apparatus therefor | |
JPS5744234A (en) | Optical servo device | |
MY116645A (en) | Improved optical disc tracking control | |
JPS5577042A (en) | Optical information recording and reproducing device | |
JPS5465504A (en) | Recording-reproducing system of information | |
JPS56148745A (en) | Optical recorder and reproducer | |
JPS6462838A (en) | Optical pick-up | |
JPS57191842A (en) | Disk record and disk record recording method |