Lens module and digital camera with automatic focusing function

Abstract

The invention relates to a lens module with automatic focus function and digital camera. The lens module comprises a drawtube, a focusing lens system set in the drawtube, at least one actuator mechanical linking with the focusing lens system. Wherein, the at least one actuator comprises at least one electric conduction polymer film with electrostrictive effect, one guide post and two springs on the guide post. The focusing lens system is in slip connection with the guide post and the two springs are set on both sides of the focusing lens system to give two acting force to the focusing lens system in opposite direction. The at least one electric conduction polymer film with electrostrictive effect is equipped on the guide post and between the two springs, the shape of which is changeable after being electrified to drive the focusing lens system move along the direction of the axis. The lens module and the camera is characterized by small volume, light weight and low energy consumption, which can be used in portable electronic equipments like cellphone.

Description

technical field [0001] The invention relates to a lens module and a digital camera using the lens module, in particular to a lens module and a digital camera with an automatic focusing function. Background technique [0002] With the rapid development of communication technology, digital cameras have been widely used in portable electronic devices such as mobile phones, and many mobile phone manufacturers have successively released mobile phones equipped with digital cameras. However, the mobile phones with digital cameras sold in the market cannot perform continuous auto-focus during shooting, thus affecting the quality of the captured images. [0003] A typical lens module with an auto-focus function generally uses an actuator such as a voice coil motor (VCM) or a stepping motor to drive the focus lens group to a target position to achieve auto-focus. However, the voice coil motor is easy to damage its mechanism due to vibration, and the stepping motor itself is relativel...

AI Technical Summary

Problems solved by technology

However, the voice coil motor is easy to damage its mechanism due to vibration, and the stepping motor itself is bulky and heavy; directly applying this kind of digital camera to portable electronic devices such as mobile phones will greatly increase the size and The weight seriously affects its portability, and the actuators such as voice coil motors or stepping motors consume a lot of power when they work, and the power reserve of portable electronic devices such as mobile phones is extremely limited, so it will greatly shorten the standby time of mobile phones time, thereby affecting the use of its basic functions

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