Control system and information recording and reproducing apparat

Details Control system and information recording and reproducing apparat Control system and information recording and reproducing apparat

1997-01-23

1999-03-09

Ruggiero, Joseph

Boots, shoes, and leggings

3641481, 364157, 364165, 360 7809, G06F 1900

Patent

active

058809538

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.

REFERENCES:
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patent: 4879643 (1989-11-01), Chakravarty et al.
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patent: 5216556 (1993-06-01), Steinberg et al.
patent: 5249116 (1993-09-01), Cluetens
patent: 5483438 (1996-01-01), Nishimura
High Performance DTF Control System -Precision DTF Control System by Using a Movable Head-Paper for Lecture at Spring Meeting of Institute of Precision Engineering 1996, pp. 1071 and 1072.
High Performance DTF Control System -Precision DTF Control System and Head Wating System in a Non-scanning Period, Paper for Regular Lecture in Kansai Area of Institute of Precision Engineering 1996, pp. 37 and 38.
Precision DTF Control System Using Observer and Modified Observer, 39th Lecture of Federation of Automatic Control (Oct. 17, 1996), pp. 91 and 92.

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