Auto focus lens

Abstract

An auto focus lens for digital cameras comprises a coil base, a lens base, 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 base is distributed with a permanent magnet to be rotateably installed inside the accommodation hole. One of the lens base's ends has a guide surface, slant and close to the stopper. The elastic component presses against the other end of the lens base 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 base. The lens base thus rotates up and down according to the design of the guide surface, and thereby the focal length of the camera is changed.

Dependencies are inferred from the claim text.