Method of using sma wire to drive moving parts

Abstract

The present application discloses a method for using SMA wires to drive the movement of movable parts, including: raising the temperature of the first SMA wire to a first temperature, and raising the temperature of the second SMA wire to a second temperature, wherein the first temperature is higher than that of the SMA wire The deformation critical temperature, the second temperature is lower than or equal to the deformation critical temperature, the first SMA line at the first temperature and the second SMA line at the second temperature are respectively in the first contraction position and the second stretching position after stabilization, so The movable part is driven by the first SMA wire and the second SMA wire to move to a desired position corresponding to the first retracted position and the second stretched position.

Description

technical field

[0001] The present application relates to a method of using SMA wires to actuate the movement of moving parts. Background technique

[0002] Shape memory alloys (Shape Memory Alloys, referred to as SMA) is an alloy material that can eliminate its deformation at a lower temperature after heating and restore its original shape before deformation, that is, an alloy with a "memory" effect. The SMA wire can be used in the camera module to replace the motor to drive the lens to move, so as to realize optical functions such as focusing. Compared with the traditional motor, the SMA wire has a smaller volume, which can effectively reduce the overall size of the module and facilitate the miniaturization of the module.

[0003] The use of SMA wires to drive the lens movement is realized through the contraction of the SMA wires at higher temperatures. During the movement, when part of the SMA wires shrink, the other part of the SMA wires is in a stretched state to match...

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