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. 22, 2006
Filed:
Dec. 10, 2003
Richard M. Ehrlich, Saratoga, CA (US);
Gary W. Calfee, Santa Clara, CA (US);
Anton Gerasimov, San Francisco, CA (US);
James V. Wiseman, Palo Alto, CA (US);
Richard M. Ehrlich, Saratoga, CA (US);
Gary W. Calfee, Santa Clara, CA (US);
Anton Gerasimov, San Francisco, CA (US);
James V. Wiseman, Palo Alto, CA (US);
Matsushita Electric Industrial Co., Ltd, Osaka, JP;
Abstract
Methods in accordance with the present invention can include determining a position of a head along a stroke by locating one or more marker-zones printed to a reference surface of a disk. The one or more marker-zones can be printed to a portion of the reference surface as one or more pulses from a template pattern that can further comprise a plurality of chevrons. In one embodiment, each pulse can trace the motion of the stroke along at least a portion of the radius of the reference surface. A pulse can identify a marker-zone edge when the pulse disappears at some radius from the center of the disk. By moving the head along the stroke, the marker-zone edge can be detected and a gross position determined. A fractional position can be determined by measuring a phase of a chevron located at substantially the same radial location as the edge.