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:
Dec. 05, 2006
Filed:
Nov. 12, 2004
Cheol-hoon Park, Suwon-Si, KR;
Kwang-jo Jung, Suwon-Si, KR;
Sang-hoon Chu, Seoul, KR;
Yong-gwon Lee, Suwon-Si, KR;
Chul Park, Suwon-Si, KR;
Cheol-Hoon Park, Suwon-Si, KR;
Kwang-Jo Jung, Suwon-Si, KR;
Sang-Hoon Chu, Seoul, KR;
Yong-Gwon Lee, Suwon-Si, KR;
Chul Park, Suwon-Si, KR;
Samsung Electronics Co., Ltd., Suwon-si, KR;
Abstract
For unlatching a head within a data storage device, such as a HDD (hard disc drive), a VCM (voice coil motor) amplifier with a switch is used for applying at least one cycle of an acceleration current pulse to a voice coil motor (VCM) for unlatching the head during an acceleration time zone. An analog to digital converter samples a characteristic of the VCM for indicating a speed of the head during the acceleration time zone. An unlatch controller terminates the acceleration time zone when the speed of the head is higher than a threshold speed, for more stable operation of the head but with guarantee of unlatching, regardless of the latch force within the HDD.