SMA actuating mechanism, anti-shake actuator and camera module

Abstract

The invention discloses an SMA actuating mechanism, an anti-shake actuator and a camera module. The SMA actuating mechanism comprises: an SMA wire, wherein the SMA wire can be electrified and contracted; and two actuating bodies symmetrically arranged, wherein each actuating body comprises an elastic part and a connecting rod. One end of the elastic part is connected with the connecting rod, and the other end is used for fixing; one ends of the two connecting rods are connected with the elastic parts, and the other ends of the two connecting rods are connected with the two ends of the SMA wirerespectively; and the two elastic parts are arranged adjacently, and an included angle A is formed between the two connecting rods. The SMA actuating mechanism has a large stroke, mutual influence between the actuating mechanisms can be avoided, and meanwhile, a driven part can be driven to move stably.

Description

technical field [0001] The invention relates to the field of electronics, in particular to an SMA actuator, an anti-shake actuator and a camera module. Background technique [0002] An actuating device (actuating device) is a commonly used driving mechanism in the electronic field, which can be used to drive a camera module to achieve anti-shake or focus. SMA refers to shape memory alloy, which is a kind of driving element in the actuating device. SMA is a material composed of two or more metal elements that has a shape memory effect (SME) through thermoelasticity and martensitic phase transformation and its inversion. SMA can be deformed at a lower temperature, can be contracted and deformed after being heated by electricity, and returns to the shape before deformation after cooling, so as to realize electronically controllable shrinkage. [0003] At present, there is an SMA actuating mechanism, which includes two supporting parts, two connecting rods, two elastic arms an...

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Problems solved by technology

[0003] At present, there is an SMA actuating mechanism, which includes two supporting parts, two connecting rods, two elastic arms and SMA wires, one end of each connecting rod is connected to a supporting part through an elastic arm, and the two ends of the SMA wires are respectively To connect two connecting rods, you need to fix the two supporting parts during use, and then connect the other end of the connecting rod to the driven part, so that the contraction of the SMA wire can drive the connecting rod to swing, and then drive the driven part to move along the vertical direction. It moves in the direction of the SMA wire; the stroke of this SMA actuator to drive the driven part can exceed the length of the contraction of the SMA wire, so it has a larger stroke, which is conducive to the miniaturization of the SMA actuator; however, this SMA The actuating mechanism needs to form a roughly triangular structure due to the two connecting rods and the SMA wire. Therefore, one end of the two connecting rods connected to the driven part needs to be fixedly connected to the same or adjacent position of the driven part in order to move along the set position. Direction drives the driven part to move; when multiple actuating mechanisms are required to drive the driven part to move in different directions, since the connecting rod is connected to the driven part, the SMA actuating mechanism in a certain direction will affect the driven part The movement of the part in the other direction; and because the connection driving point of the SMA actuator and the driven part is at the same position or adjacent to the position, it is not stable to drive the driven part to move through this SMA actuation mechanism

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