Double-layer piezoelectric ceramic electroacoustic component and preparation method thereof

Abstract

The invention discloses a double-layer piezoelectric ceramic electroacoustic component, comprising two piezoelectric ceramic sheets; the electrode of a first surface of the piezoelectric ceramic sheetcomprises a large electrode region and an island electrode region which are not communicated to each other; a through hole is respectively formed in the large electrode region and the island electrode region; the electrode pattern on the second surface of the piezoelectric ceramic sheet is obtained by rotating the electrode pattern of the first surface by 180 degrees; the polarization direction of the piezoelectric ceramic sheet is directed from the first surface to the second surface; the second surface of the first piezoelectric ceramic sheet is bonded to the first surface of the second piezoelectric ceramic sheet, wherein the island electrode regions are overlapped but the through holes on the island electrode regions do not correspond, and four blind holes are formed after bonding; the four blind holes on the bonded piezoelectric ceramic sheets are filled with a conductive material, the two island electrode regions are respectively connected, and the two large electrode regions are connected. The invention also discloses a preparation method of the double-layer piezoelectric ceramic electroacoustic component. According to the double-layer piezoelectric ceramic electroacousticcomponent and the preparation method thereof in the invention, an intermediate metal layer is not needed to be adopted; the electro-acoustic conversion efficiency is improved, installation and use arefacilitated, and the breakage rate during production is low.

Description

technical field [0001] The invention relates to a piezoelectric ceramic electroacoustic element, in particular to a double-layer piezoelectric ceramic electroacoustic element and a preparation method thereof. Background technique [0002] Piezoelectric ceramic materials are widely used in the manufacture of piezoelectric electroacoustic components (including piezoelectric buzzers, piezoelectric buzzers, and piezoelectric speakers). Piezoelectric ceramic electroacoustic components use the inverse piezoelectric effect of piezoelectric ceramic materials to realize electromechanical energy conversion. When an AC signal is applied to the piezoelectric component, the piezoelectric component generates mechanical vibration. When the frequency of the applied AC signal is within the audio frequency (20~20kHz) range, the piezoelectric element emits sound. [0003] Piezoelectric ceramic materials have resonance characteristics. When the frequency of the input electrical signal is near ...

AI Technical Summary

Problems solved by technology

[0005] The existing technology adopts the method of bonding piezoelectric ceramics to metal sheets to reduce the resonance frequency of piezoelectric composites to realize audio electroacoustic applications. Metal sheets themselves do not have piezoelectric effects, and piezoelectric ceramics are reverse-pressed under the excitation of audio and electrical signals. The electrical effect causes it to generate mechanical vibration. During this process, the deformation of the piezoelectric ceramic sheet causes the metal sheet to follow the deformation to generate audio vibration. The electromechanical conversion efficiency of the piezoelectric ceramic will be weakened by the metal sheet. On the other hand, the piezoelectric ceramic metal composite The resonant frequency of the body is proportional to the thickness of the composite body, which includes the thickness of the metal sheet. Therefore, to make a piezoelectric electroacoustic element with a lower frequency response, it is necessary to make a very thin piezoelectric ceramic sheet. During the manufacturing process of piezoelectric ceramics , the thinner the ceramic sheet is, the easier it is to break

Another defect in the production of double-sided piezoelectric electroacoustic components in the prior art is that it is necessary to use connecting wires to connect the piezoelectric ceramic sheets on both sides as one pole (the protruding metal sheet is used as the other pole), which limits the application of this product structural design

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