A mems microstructure four-axis vibration device with piezoelectric ceramics as the excitation source

Abstract

The invention discloses a MEMS microstructure four-axis vibration device using piezoelectric ceramics as an excitation source, including a sleeve and a bottom plate, piezoelectric ceramics, a pressure sensor, upper and lower connecting blocks, elastic supports, and a MEMS microstructure; There is an annular top plate on the upper end of the sleeve, and the microstructure is set on the annular top plate through elastic supports; guide shafts are evenly distributed between the annular top plate and the bottom plate, and the lower connecting blocks are evenly distributed with guide arms and passed through the sleeve wall And sleeved on the guide shaft, a locking device is provided on the guide arm; spherical grooves and spherical protrusions are provided on the upper and lower connecting blocks; piezoelectric ceramics are sandwiched between the pressure sensor and the elastic support; the upper The outer edge of the coupling block is pushed into the outer wall of the sleeve through uniformly connected ball plungers. 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, and in particular relates to a MEMS microstructure four-axis vibration excitation device using piezoelectric ceramics as an excitation source. 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 mi...

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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

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