Research On Linear Piezoelectric Actuator And Its Application In Image Stabilization System

With the development of materials science, MEMS sensors, actuators technology, microelectronics technology and the progress of image stabilization technology, optical image stabilization feature products are increasingly used in our lives. It has become an important research topic in the field of optical engineering to understand how optical image stabilization makes products more compact, lightweight and intelligent.Since the stack of piezoelectric ceramic is characterized by its small size, high precision and simple structure, it has wide range of application in the high-tech fields of precision instruments, aerospace, medical, robotics. The actuator using the laminated piezoelectric ceramic as the driving parts provides a practical way for the development of image stabilization technology.With the help of a new triangle amplification principle, the stack of piezoelectric ceramic is used as an actuator to design the micro-displacement amplification mechanism with two-way actuation functions. And it is used as the mobile unit to achieve two-dimensional actuation of optical elements. The main contents of this paper are as follows:The output characteristics of piezoelectric ceramic stack in two different models are studied experimentally; the relationship between the preload of piezoelectric ceramic stack and generate voltage is calibrated utilizing piezoelectric effect.Design two types of double action Actuator with different structures and produced the prototypes, experimental tests of the prototypes are carried out and the results show that: the maximum output displacement hinged is 32μm, a 10 Hz increase of the signal frequency can cause a 0.3μm reduction of displacement, every 10 V change in the signal voltage can cause a 1.8μm change in displacement, hysteresis was 16.2 percent; friction maximum output displacement is 32μm, a 10 Hz increase of the signal frequency can cause a 1.8μm reduction of displacement, every change in the signal voltage 10 V, the displacement of about 1.2μm every 10 V change in the signal voltage can cause a 1.2μm change in displacement, hysteresis 13.3%Optical image stabilization piezo actuation system is studied experimentally, when the actuator moves only in the axial direction, displacements in the X and Y axes are both 28μm, in good linearity and symmetry. As a group of co-movement in both directions, in the experimental data, the actual moving direction and the direction of the theory of a maximum 5.4 ° deviation, the actual displacement is only 40% ~ 60% of theoretical displacement.