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:
Mar. 29, 1983
Filed:
Sep. 15, 1980
Wilbur E DuVall, Victorville, CA (US);
Xerox Corporation, Stamford, CT (US);
Abstract
The number of data tracks or positions that a transducer can access or track is increased, beyond that conventionally permitted by the transducer conductor spacing, by first providing a plurality of signals corresponding in number to the factor by which the tracking capacity of the transducer is to be increased, with all signals having a common frequency equal to that of the drive signals applied to the transducer stator windings and with each signal being phase delayed relative to the other signals by one or more clock increments, then accessing the signal having a phase corresponding to the data track to be tracked, providing from that accessed signal a plurality of additional relatively phase delayed signals, and applying each of the later phase delayed signals to one of a plurality of phase detectors each of which also receives an input corresponding to the squared transducer rotor signal whereby the phase detectors provide at their output width modulated signals having a low frequency component corresponding to the rotary position signal.