SMA actuator, camera module having same, and electronic device

Abstract

The present invention discloses an SMA actuator, and also discloses a camera module having the SMA actuator and an electronic device having the camera module. The SMA actuator includes: an SMA wire that is contractible when energized; and an actuating body of a quadrilateral structure, wherein the four edges of the actuating body are formed by connecting four elastic supporting arms, the two endsof each elastic supporting arm are fixedly connected with one ends of the other two elastic supporting arms respectively, the two opposite angle parts of the actuating body fix the two ends of the SMAwire, and the other two opposite angle parts of the actuating body fix and are connected with a driven piece. The SMA wire clamped at the diagonal positions divides the actuating body of the quadrilateral structure into an upper triangular part and a lower triangular part, that is, every two elastic supporting arms and the SMA wires form a triangular structure, and the stroke capable of driving an object to move is longer.

Description

Technical field [0001] The present invention relates to the field of electronics, in particular to an SMA actuator and a camera module and electronic equipment having the same. Background technique [0002] At present, many electronic devices on the market have camera functions. In order to meet the volume requirements of electronic devices, the camera modules in electronic devices generally use voice coil actuators or SMA actuators to drive the lens to focus and achieve anti-shake functions. . At present, there is an SMA actuator, which uses the SMA wire to drive the elastic force arm to rotate, and then through the elastic force arm to drive the lens assembly and other driven parts to move, to achieve the focus or anti-shake function, its structure is simple, and relatively sound The coil actuator has little electromagnetic interference; however, the movement distance of the SMA actuator to drive the lens assembly and other driven parts is limited. With the increasing requirem...

AI Technical Summary

Problems solved by technology

At present, there is an SMA actuator, which uses an SMA wire to drive the rotation of the elastic arm, and then drives the driven parts such as the lens assembly to move through the elastic arm to achieve the focus or anti-shake function. Its structure is simple, and it is relatively quiet. The electromagnetic interference of the ring actuator is small; but the distance that the SMA actuator drives the driven parts such as the lens assembly is limited. With the increasing requirements for the miniaturization and high magnification of the camera module, the SMA The actuator has been difficult to meet the needs of use

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