Piezoelectric Ceramic Stack Structure and Piezoelectric Sensor

Abstract

The invention relates to a piezoelectric ceramic stack structure and a piezoelectric sensor. The piezoelectric ceramic stack structure includes: a columnar piezoelectric ceramic body, including a first end portion and a second end portion opposite to each other in the axial direction, the columnar piezoelectric ceramic body includes more than two piezoelectric ceramic stack layers, and more than two piezoelectric ceramic stack layers Two adjacent electrodes of two adjacent piezoelectric ceramic stack layers in the electric ceramic stack layer have the same polarity; each piezoelectric ceramic stack layer is provided with an electrode lead terminal on the surface facing the first end; two adjacent electrodes The polarities of the lead terminals are opposite and staggered in the axial direction, and the electrode lead terminals provided for each piezoelectric ceramic stacked layer in the columnar piezoelectric ceramic body are exposed to the external environment; connecting parts, more than two piezoelectric ceramic stacked layers connected by connecting parts. The piezoelectric ceramic stack structure of the present invention can improve its overall rigidity, thereby improving frequency response characteristics, reducing stress value fluctuations in high temperature environments, simple structure, and suitable for mass production.

Description

technical field [0001] The invention relates to the technical field of detection equipment, in particular to a piezoelectric ceramic stack structure and a piezoelectric sensor. Background technique [0002] Piezoelectric sensors are increasingly used to measure the vibration of objects. Piezoelectric ceramic stack structures currently used as piezoelectric elements are often provided with connecting layers between piezoelectric ceramic sheets. Although this structure realizes the assembly of the piezoelectric element, the height of the stacked structure of the piezoelectric ceramic will be increased due to the cooperation between the connection layer and the piezoelectric ceramic sheet. When applied in a vibrating environment, the above-mentioned piezoelectric ceramic stack structure will be deformed, thereby absorbing part of the energy, thereby reducing the overall stiffness of the sensor and affecting the frequency response characteristics. Contents of the invention ...

AI Technical Summary

Problems solved by technology

Although this structure realizes the assembly of piezoelectric elements, the height of the piezoelectric ceramic stack structure will be increased due to the cooperation between the connection layer and the piezoelectric ceramic sheet.

When applied in a vibrating environment, the above-mentioned piezoelectric ceramic stack structure will deform and absorb part of the energy, thereby reducing the overall stiffness of the sensor and affecting the frequency response characteristics

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