Actuator position detector, actuator position controller and tra

Details Actuator position detector, actuator position controller and tra Actuator position detector, actuator position controller and tra

1993-08-04

1994-08-23

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4429, 369 4432, 369 4441, G11B 700

Patent

active

053413539

ABSTRACT:
A track search controller has three two-segment photodetectors, three subtracters associated respectively with the two-segment photodetectors, a processing circuit, and a servo control cirucit. Each of the photodetectors produces two output signals based on a light beam reflected from an optical disk. Each of the subtracters produces a differential output signal representing the difference between the output signals from the associated photodetector. The processing circuit generates an actuator position signal from the output signals from the subtracters. The actuator position signal contains a component indicative of a deviation of the actuator due to its vibration. The servo control circuit controls an actuator, which actuates a laser beam source, so that the actuator position signal will be of a constant value.

REFERENCES:
patent: 4750162 (1988-06-01), Tajima
patent: 4864552 (1989-09-01), Getreuer et al.
patent: 4866688 (1989-09-01), Ohtake
patent: 5049733 (1991-09-01), Yoshifusa et al.
patent: 5084849 (1992-01-01), Ishii et al.
patent: 5123002 (1992-06-01), Tateishi
patent: 5148424 (1992-09-01), Wachi

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