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:
Aug. 06, 2002
Filed:
Jan. 26, 1999
Donald James Chritz, Jr., Kokomo, IN (US);
James Robert Pressgrove, Kokomo, IN (US);
Dan Darryl Carman, Russiaville, IN (US);
Delphi Technologies, Inc., Troy, MI (US);
Abstract
A compact disc player includes an optical pickup supported by a carriage and a microprocessor for controlling the movement of a coarse actuator and a fine actuator. The coarse actuator controls the movement of the carriage and maintains its position when power is interrupted to the coarse actuator. The fine actuator is disposed between the carriage and the pickup and provides fine movement for the pickup when power is supplied to the actuator. The fine actuator moves the pickup to a neutral position when power is interrupted. A resume function is provided that restores the position of the pickup after a power interruption to its position before the interruption. A value indicative of the position of the pickup relative to the carriage is stored in memory. When power is restored to the disc player, the value is read from memory. The disc control microprocessor directs incremental movements of the fine actuator until the position of the pickup corresponds to the position represented by the stored value.