JPS6091800A - Composite piezoelectric laminating body - Google Patents

Abstract

PURPOSE:To decrease vibration loss by applying silver paste included with minute glass particles to positive and negative electrodes, opposing piezoelectric materials, heating and bonding them and connecting them with a silver electrode so as to incorporate them. CONSTITUTION:Silver paste 21, 22 included with glass minute particles is applied to both faces of the piezoelectric ceramic element 1, the elements are laminated while the silver paste 21 and 22 are opposed to each other and a slight pressure is applied axially. The silver paste is not coated on the entire face but a slight non-coating part 1' is provided to a position opposed to a lead wire connecting part so as to leave a small space at the opposite side of the lead wire connecting part of the electrodes 21, 22. The assembly is heated to a temperature at which the glass in the silver paste is molten in this state so as to bond strongly the piezoelectric element 1 and the silver electrode. The electrodes 21 are soldered with a lead wire 23 and the electrodes 22 are soldered with a lead wire 24 so as to connect the electrodes of the entire piezoelectric element in parallel with the polarities electrically and connected in cascade mechanically.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a configuration of a vibrating element portion of an ultrasonic vibrator using a plurality of stacked piezoelectric materials.

(Background of the invention) Odors such as bolted Langevin oscillators.

When using a piezoelectric vibrating element, each piezoelectric element was fired and polished, then a silver electrode was baked on it and a post-polarization treatment was performed at ℃.

A plurality of polarized piezoelectric elements (1) are glued together as shown in Figure 1 (α).
They were adhered at 1.22° C. in alternating directions.

For the silver electrode, paste 3 mixed with silver powder and fine glass particles was applied to the electrode surface of the piezoelectric material, and the temperature was raised to a temperature at which the glass melted and no baking occurred. As a result, the glass and the piezoelectric material came into close contact, and the silver was interposed and retained.

Thereafter, lead wires 25 and 24 were used to electrically connect each electrode. However, with such a configuration, the contact layer between the electrode and the piezoelectric element may be baked and sometimes peeled off, resulting in troublesome management during the baking process.

[Purpose of the invention]

In the present invention, when using a plurality of stacked piezoelectric ceramic elements, there is an unavoidable bonding work, but this is done in the process of baking the glass-filled silver electrode material when forming the electrodes of each element. [Summary of the Invention] The present invention aims to improve the bonding by using silver electrodes. [Summary of the Invention] The present invention is capable of eliminating the conventional adhesive layer by applying pressure bonding as described above. Furthermore, since the thickness of the bonding layer can be made as thin as 10 to 20 microns, it is possible to reduce vibration loss.

An embodiment of the present invention shown in FIGS. 2A and 2M will be described in detail below.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIG. 2 (al, t, 61).

Silver paste (containing glass fine particles) 21.22>i is applied to both sides of the pressure ridge ceramic element 10, and each element is laminated with the bride pastes 21 and 22 rotating around each other, and a slight pressure is applied in the axial direction. Add 0 kontomasu, Figure 2 1a
As shown in Fig. J, do not apply the silver paste to the entire surface, but leave a small uncoated area 1' of tilIVC in a position opposite to the lead wire connection part, and by applying and polishing it, as shown in Fig. 161 of A2. In addition, the electrodes 21 and 22 are connected to the respective leads fIM.
There will be a little space on the other side of the connection.

In this state, the pressure is reduced to 1! by heating the silver paste to a temperature at which the glass melts. The resistor 1 and the silver electrode are firmly joined. By soldering and connecting the electrodes 21 to each other with the lead wire 26 and the electrodes 21 to each other with the lead wire 24, the '1 poles of the total pressure tits terminal are simultaneously connected in parallel, respectively, and mechanically connected in cascade. It is connected and becomes 1 here.

From this, the composite laminated pressure turtle body shown in Figure 2 is 11 yen.
From the Makicho body shown in 1(b)! P counterfeit agent 3 yen: It is possible to obtain a joined product without using ゛. Polarization treatment is performed in this state.

[Efficacy of invention]

According to the present invention, since the adhesive N3 is not used when manufacturing the composite layer piezoelectric assembly, it is possible to reduce the loss caused by vibration. Since the Young's modulus of elasticity differs by more than one order of magnitude between the normal pressure adhesive layer 1 Lamic 1 and the contact material 6, the influence of the thickness of the contact material layer on the loss cannot be ignored.

10,000, piezoelectric polarization work is also conventional c/) s1 go, island 1 figure (
As shown in α), the individual polarized parts were joined together, but as shown in Fig. 2, the polarized parts were all connected in parallel in a rigid state. It only takes - times. As shown in this σ), the more rays and rays there are, the more λυ comes out. It can be provided to ``c!t!-i'' songs.

[Brief explanation of drawings]

Figure 1 (al is a side view of a conventional piezoelectric ML system element (with negative pole), Figure 1 1b+ is a conventional piezoelectric element composite ram; integral σ) cross-sectional diagram, Figure 2 (al, ibl are This shows an embodiment of the present invention.Fast 2 (α) is from the cheering surface, center & piezoelectric body σ]
Normal blood diagram, Fig. 2 (, 61 shows a side view of fJl @ 槓r= made of a Satsugo pressure paper 懓j. 1... piezoelectric ceramic material 1'... non-painted part 21... Positive '1 pole 22...
Negative 1a pole 25...+Janno Kuisu-de Iwao 24...-Jumper lead Iwao 5...Adhesive

Claims (1)

[Claims] By applying silver paste containing glass fine particles to the positive and negative electrodes of multiple pieces of piezoelectric ceramic material, and heating and bonding them facing each other, all the piezoelectric ceramic materials are bonded by the silver electrode when forming the silver electrode. A composite piezoelectric laminate characterized in that the composite piezoelectric laminate is integrated into one body, and then subjected to polarization treatment while being electrically connected in series using lead wires.