Auto focus lens system

Details Auto focus lens system Auto focus lens system

2004-09-29

2008-08-12

Ye, Lin (Department: 2622)

Television

Camera, system and detail

Optics

C348S340000

Reexamination Certificate

active

07411625

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.

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