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. 12, 2008
Filed:
Sep. 29, 2004
Yi-ming Lee, Taipei, TW;
Wei-kuo Shih, Taipei Hsien, TW;
Yi-Ming Lee, Taipei, TW;
Wei-Kuo Shih, Taipei Hsien, TW;
Lite-On Technology Corporation, Taipei, TW;
Abstract
An auto focus lens for digital cameras comprises a coil base, a lens barrel, and an elastic component. The coil base which has a coil wounded around in a specific direction and which has an accommodation hole whose bottom is provided with a stopper. The surface of the lens barrel is distributed with a permanent magnet and the lens barrel is rotatably installed inside the accommodation hole. One of the lens barrel's ends has a guide surface, slant and close to the stopper. The elastic component presses against the other end of the lens barrel so that the guide surface touches the stopper permanently. When the coil is provided with an electric current, a magnetic force is generated to repel the permanent magnet on the lens barrel. The lens barrel thus rotates up and down according to the design of the guide surface, and thereby the focal length of the camera is changed.