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. 10, 1992
Filed:
Mar. 01, 1991
Michael D Sidman, Colorado Springs, CO (US);
Digital Equipment Corporation, Maynard, MA (US);
Abstract
For a disk drive having a servo positioning system for moving and positioning a read/write head in track seeking and following operations, a velocity estimator connected to derive velocity signals selectively from a plurality of position signals, the phasing of said position signals being such that at least one of the signals at any given radial position of ther head varies linearly with radial head displacement, that is, with a constant change in signal level per unit of radial displacement. The phase of the position signals are such that as one position signal is about to leave its linear operating region, another is in its linear operating region. The velocity estimator comprises a plurality of sections each selectively switched to receive and differentiate a position signal and connected so that there is not current surge resulting form such switching.