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:
Jul. 07, 1992
Filed:
Jul. 09, 1990
Hisatoshi Uno, Tokyo, JP;
TEAC Corporation, Tokyo, JP;
Abstract
A system for positioning a transducer with respect to a multiplicity of concentric annular data tracks on a rotating hard magnetic disk. Included is a differential amplifier for providing an output proportional to the difference between a transducer speed signal representative of the actual traveling speed of the transducer and a seek speed signal representative of desired variable speed at which the transducer is to be moved to any desired destination track. A low pass filter is provided for eliminating an undesirable higher frequency component from the output from the differential amplifier, before this output is sent to a driver circuit for a transducer positioning motor such as a voice coil motor. In order to minimize the adverse effects arising from the phase lag introduced by the low pass filter, this filter is made switchable between two different cutoff frequencies. Each track seeking operation starts with the low pass filter held at the lower cutoff frequency. The filter is switched to the higher cutoff frequency when the distance between the instantaneous current position of the transducer and the destination track decreases to a predetermined value.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile