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. 15, 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
Template patterns in accordance with the present invention can include one or more marker-zones printed to a reference surface of a disk for determining gross-position along a stroke of a read head connected with a rotary actuator. The one or more marker-zones can be printed or otherwise written to a portion of the reference surfaces as one or more pulses. 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 a di-bit (a transition pair representing a pulse) disappears at some radius from center of the disk. At a radius closer to the center of the disk, the di-bit can abruptly reappear so that the pulse is continued. The interruption in the radial continuity of the magnetized pulse defines the marker-zone and can be any length.