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:
Sep. 28, 2010
Filed:
Sep. 30, 2008
Applicants:
Jian Qin Gong, Santa Clara, CA (US);
Chang Ik Kang, Santa Clara, CA (US);
Inventors:
Jian Qin Gong, Santa Clara, CA (US);
Chang Ik Kang, Santa Clara, CA (US);
Assignee:
Samsung Electronics Co., Ltd., Suwon, KR;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G11B 21/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
A hard disk drive with a voice coil motor coupled to a head. The disk drive includes a circuit that provides a drive current with a sinusoidal waveform to the voice coil motor during an unload routine. The back emf of the voice coil motor can be determined during a sample period when the current is essentially zero. There is no need to perform a resistance calibration. This reduces the time needed to unload the head.