A four-axis excitation device that can dynamically drive mems microstructures

Abstract

The invention discloses a four-axis excitation device capable of dynamically driving a MEMS microstructure, which includes a sleeve and a bottom plate, piezoelectric ceramics, a pressure sensor, upper and lower connecting blocks, elastic supports and a MEMS microstructure; There is a ring-shaped top plate, and the microstructure is set on the ring-shaped top plate through elastic supports; guide shafts are evenly distributed between the ring-shaped top plate and the bottom plate, and the lower connecting block is evenly distributed with guide arms, which are passed through the sleeve wall and sleeved on the guide shaft On the bottom surface of the upper connection block, a spherical protrusion is arranged at the center, and a tension spring is evenly distributed on the circumference between the bottom surface of the upper connection block and the guide arm of the lower connection block, and the spherical protrusion is elastically pressed on the lower connection block by the tension spring; The piezoelectric ceramic is sandwiched between the pressure sensor and the elastic support. The device can apply different sizes of pre-tightening force to the piezoelectric ceramics, so that the obtained pre-tightening force measurement value is more accurate, and the adjustment process of compensating the parallelism error of the two working surfaces of the piezoelectric ceramics becomes smoother and smoother, which is convenient Test dynamic characteristic parameters.

Description

technical field [0001] The invention belongs to the technical field of micromechanical electronic systems, in particular to a four-axis excitation device capable of dynamically driving MEMS microstructures. Background technique [0002] Due to the advantages of low cost, small size and light weight, MEMS microdevices have broad application prospects in many fields such as automobile, aerospace, information communication, biochemistry, medical treatment, automatic control and national defense. For many MEMS devices, the micro-displacement and micro-deformation of their internal microstructures are the basis for the realization of device functions. Therefore, accurate testing of dynamic characteristic parameters such as the amplitude, natural frequency, and damping ratio of these microstructures has become the key to developing MEMS products. important content. [0003] In order to test the dynamic characteristic parameters of the microstructure, it is first necessary to make...

AI Technical Summary

Problems solved by technology

[0006] 2. There is no direct connection between the upper connection block and the lower connection block and the sleeve, but are installed in the sleeve in turn by means of clearance fit. If the parallelism error of the two working surfaces of the stacked piezoelectric ceramics is large , there is not enough space to adjust the movable base structure;

[0007] 3. The pressure sensor is installed at the bottom of the lower connecting block. Since the movable base structure adjusts itself, there is a certain inclination between the bottom of the lower connecting block and the working surface of the piezoelectric ceramic, so the pre-tightening force measured by the pressure sensor Or the output force of piezoelectric ceramics is not accurate; in addition, if the movable base structure causes the upper coupling block or the lower coupling block to contact the sleeve after adjustment, the error of the measurement result will further increase;

[0009] 5. In this device, gaskets of different thicknesses are used to change the magnitude of the pre-tightening force applied to the stacked piezoelectric ceramics, which makes the adjustment process complicated and not flexible enough

Images