Design Of 2D Piezoelectric Micro Motion Mechanism And Its Application In Optical Image Stabilization

At present,Piezoelectric actuators are widely applied in the field of aerospace,biomedical and precision machinery because of their high accuracy,fast response,compact structure and simple control methods.In order to meet the demand of high precision,fast response and the ability of resisting electromagnetic interference and overload,the servo system is applied to optical image stabilization in the field of aerospace.In this paper,using of laminated piezoelectric ceramic as driving element,and designed a direct drive type piezoelectric linear actuator which based on the principle of bridge amplification,then formed two-dimensional micro mechanism through the laminated way in series,at last,this mechanism is used as the servo compensation driver in the optical image stabilization system.The main research duties as follows:To meet the demands of stabilization technology in the aerospace field,this paper proposed the optical image stabilization technology driving by piezoelectric material,and designed a piezoelectric actuating mechanism of meeting the using demands.The piezoelectric actuating mechanism mounted in the optical image stabilization system,and tested the feasibility of the piezoelectric actuating mechanism in the optical image stabilization system.By testing the output performance of the piezoelectric actuator,the advantages of the piezoelectric actuator as an optical image driving device are introduced.Firstly,the paper studied the output performance of laminated piezoelectric ceramic,based on bridge amplification principle to design a one-dimensional piezoelectric actuator,and established the theoretical model,and deduced the stiffness calculation formula of circular flexure hinge,through onedimensional experimental test shows that the design of the piezoelectric actuator output performance to meet the requirements of optical image stabilization.According to the requirement of optical image stabilization,designed a series of 2D micro motion mechanism,established the theoretical model,and analyzed its statics and modal by finite element method,it can meets the needs of moving stroke and working environments.It made a prototype by the design of 2D micro mechanism,and analyzed the displacement output characteristics.The results showed that: the trip reached 115μm and 118μm in two directions when the control voltage is 120V;dynamic performance of the two-dimensional motion mechanism meets the needs of optical image stabilization,and the step response time is milliseconds;the minimum step move of the mechanism is 100 nm when the control step voltage is 0.1V.The application of the two-dimensional micro mechanism is applied in optical image stabilization is researched,proposed the design scheme for optical image stabilization and its test system,and tested 1D piezoelectric actuator applied in infrared optical image stabilization system by experiments.The test results showed that the infrared image stabilization system can output the stable and clear image with small amplitude random interference in real time,furthermore,it is proved that the piezoelectric actuator applied in the optical image stabilization system is feasible.