Storage Technology Corporation

Ashok B Nayak

Leonard Laub

Apparatus for reading information stored in a track pattern on a radiation reflecting record comprises a source of radiation for supplying a reading beam a tracking mirror assembly controllable for directing the reading beam in a radial direction on the record, an objective lens for controlling focus, a data photodetector and at least a first paired photodetector array including separated sectors for providing tracking error correction signals, optical detenting means comprising at least a second source of radiation fixed in place relative to an undeflected position of the tracking mirror and a second paired photodetector array associated with the second source for detecting movement of the tracking mirror from its undeflected position and means coupled from the output of the second photodetector array to the tracking mirror assembly for providing error correction signals to maintain the detent conditions during slewing.

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La Verne, CA, United States of America

Ashok B Nayak