Method of using SMA wire to drive active part to move

Abstract

The invention discloses a method of using an SMA wire to drive an active part to move, which comprises steps: the temperature of a first SMA wire rises to a first temperature, the temperature of a second SMA wire rises to a second temperature, the first temperature is higher than an SMA wire deformation critical temperature, the second temperature is lower than or equal to a deformation critical temperature, the first SMA wire at the first temperature and the second SMA wire at the second temperature are located at a first contraction position and a second stretching position after stabilization, and the active part moves to a desired position corresponding to the first contraction position and the second stretching position under drive of the first SMA wire and the second SMA wire.

Description

Technical field

[0001] This application relates to a method of using SMA wires to drive moving parts. Background technique

[0002] Shape Memory Alloys (SMA for short) is an alloy material that can eliminate its deformation at a lower temperature after heating up and restore its original shape before deformation, that is, an alloy with a "memory" effect. The SMA cable can be used to replace the motor in the camera module to drive the lens movement, so as to achieve 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, which is beneficial to the miniaturization of the module.

[0003] Using the SMA wire to drive the lens movement is achieved by the contraction of the SMA wire at a higher temperature. During the movement, when one part of the SMA wire contracts, the other part of the SMA wire is in a stretched state to match the movement of the lens . When the lens mo...

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