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:
Jul. 15, 2008
Filed:
Apr. 29, 2005
Yu-kuang Tseng, Hsinchu, TW;
Yu-Kuang Tseng, Hsinchu, TW;
Vasstek International Corp., Hsinchu, TW;
Abstract
A voice coil motor apparatus applied to an auto-focus or variable-focus lens module of a miniaturized camera includes: a voice coil motor, a plurality of steel guidance shafts, a lens holder, and a base. The voice coil motor also includes a magnetic part including magnets and yokes, and an electrical part including a coil winding. The magnetic part is rigidly coupled to the lens holder to form the moving member. The electrical part and the steel guidance shafts are fixed on the base to form the non-moving member. The pre-loaded force due to the interaction between the leakage flux of the magnetic part and the steel guidance shafts eliminates the free-play resulting from the tolerance gap between the moving and the non-moving members, and that the magnets and the yokes form a non-circular magnetic structure having a rectangular contour in order to minimize the overall dimension.