The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 12, 1984
Filed:
Jun. 30, 1981
Ashok B Nayak, La Verne, CA (US);
Leonard Laub, Pasadena, CA (US);
Storage Technology Corporation, Louisville, CO (US);
Abstract
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.