Control system and information recording and reproducing apparatus
US5880953A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 1997 |
| Grant date | Mar 9, 1999 |
| Priority date | — |
| Expiry date | Jan 23, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/41435
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An actuator moves a signal reproducing element based on an applied control input. An error detector detects a difference in relative position between a desired track and the signal reproducing element. A drive circuit computes the input valuable applied to the actuator based on an output from the error detector and applies it to an adder. On the other hand, the actuator simulation circuit for electrically simulating the characteristics of the actuator estimates the position of the actuator from the control input. Furthermore, a target follow-up estimator estimates a track bend based on outputs from the actuator simulation circuit and the error detector and are fed forward to the adder via a feedforward gain. The Adder applies the computed control input to the actuator. As a result, a control system which offers an improved precision over a wide band can be achieved while maintaining the stability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.