Automatic focusing device

Abstract

The invention discloses a self-focusing device, which contains lens tube and piezo element in the lens tube, wherein the lens tube is composed of the first lens group, second lens group and lens, which realizes the focusing function; the lens is contained in the piezo element, which connects the variable voltage circuit electrically.

Description

【Technical field】 [0001] The invention relates to an automatic focus device of a digital camera, in particular to an automatic focus device of a digital camera for electronic devices. 【Background technique】 [0002] Most of the optical modules of digital cameras used in electronic devices (such as mobile phones, PDAs, etc.) are fixed-focus designs, so they cannot realize the zoom function. In order to shoot farther objects, it is necessary to change the object distance, so the position of the lens needs to be adjusted. The focusing mechanism of a traditional digital camera generally uses a motor and a transmission mechanism to drive the lens to move to perform the focusing action. It needs to be equipped with a complex transmission mechanism to implement it. Used on smaller electronic devices. [0003] In the prior art, a piezoelectric element is used to drive the lens to achieve the focus of the camera. For example, U.S. Patent No. 4,601,539 discloses a lens moving device ...

AI Technical Summary

Problems solved by technology

[0004] However, the lens driving device of the prior art changes the position of the lens through the action of the piezoelectric element to achieve the focusing function, because the device needs to be provided with a piezoelectric element at both ends of the lens barrel or at one end. An elastic element is provided at one end, so that the structure of the lens driving device is complicated

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