Piezoelectric motor, control method of piezoelectric motor and camera module

Abstract

The invention provides a piezoelectric motor, a control method of the piezoelectric motor and a camera module, and relates to the technical field of precision driving. The piezoelectric motor comprises a first resonance part, a second resonance part, a first excitation part, a second excitation part, a first transmission arm and a second transmission arm, wherein the first transmission arm and the second transmission arm are connected; the first resonance part and the second resonance part are symmetrically arranged relative to a first middle surface; the first excitation part is arranged on the first resonance part, and the first excitation part can excite the first resonance part to vibrate when an electric signal is loaded on the first excitation part; the second excitation part is arranged on the second excitation part, and the second excitation part can excite the second excitation part to vibrate when the electric signal is loaded on the second excitation part; the first transmission arm is connected with the first resonance part, the second transmission arm is connected with the second resonance part, the first transmission arm and the second transmission arm are asymmetric about the first middle surface, a first contact head is formed at the joint of the first transmission arm and the second transmission arm, and the first contact head is used for abutting against a driven part so as to drive the driven part to move.

Description

technical field [0001] The present application relates to the field of precision drive technology, and in particular to a piezoelectric motor, a control method for the piezoelectric motor, a camera module and a device with a moving load. Background technique [0002] Taking pictures is an important function of mobile terminals such as mobile phones and tablet computers. During the process of taking pictures, the driving unit is used to drive the imaging lens assembly to move to achieve optical zoom, and then zoom in or out of the scene to be photographed. The larger the optical zoom factor, the farther the scene can be captured. With the continuous improvement of people's needs for taking pictures, a larger optical zoom factor has become one of the keys to the development of mobile terminals in the future. To achieve a larger optical zoom factor, the moving distance of the imaging lens assembly is also relatively large. [0003] At present, the driving unit that drives the...

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Problems solved by technology

[0005] However, the vibration amplitude of the protrusion 03 in the piezoelectric motor is still relatively small, resulting in insufficient movement speed and output force of the follower 04, so that a fast response with a large stroke cannot be achieved. The piezoelectric motor is applied to the camera module When it is medium, it is also impossible to achieve a large multiple optical zoom

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