Tracking circuit for guiding a beam of light along data tracks o

Details Tracking circuit for guiding a beam of light along data tracks o Tracking circuit for guiding a beam of light along data tracks o

1991-05-22

1992-08-04

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4429, 369 4432, 369 4434, 369 54, G11B 709

Patent

active

051365685

ABSTRACT:
A tracking circuit for guiding a beam of light along data tracks of a recorded medium as compact disks and video disks, in which the recorded medium reflects a light beam onto a photodetector. The photodetector has an output voltage that is applied to a servo through a variable-gain amplifier. A compensation voltage is superimposed over the output voltage from the photodetector during the open state of the circuit to compensate off said voltages. This compensation voltage is varied until the sum of the output voltage from the photodetector and the compensation voltage attains a predetermined value. Thereafter the circuit is closed.

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