JPH027479A - Piezoelectric element - Google Patents

Abstract

PURPOSE:To bring a contact of a lamination surface of a piezoelectric oscillator and a ceramic actuator into secure contact, to increase the contact and to realize good electric conductivity by using a piezoelectric element which is made by mixing metal oxide of particle diameter of 5-10mum for an electrode material at 5-20%. CONSTITUTION:Burning or electroless plating of electrode material 2 whereto metal oxide 5 of particle diameter of 5-10mum is mixed at 5-20% is applied to a piezoelectric element 1. The piezoelectric element 1 and an electrode material 2 are laminated to a thin metal plate 3 with an adhesive 4. Two sheets of piezoelectric element 1 and electrode material 2 are laminated with the adhesive 4. An adhesive layer is about 2-3mum at a lamination surface of the piezoelectric element 1 and the thin metal plate or that of piezoelectric elements while an electrode surface of the piezoelectric element is 5-10mum. Therefore, a contact of a lamination surface comes into secure contact and also increases. Electric conductive failure does not generate and good and stable electric characteristics are acquired.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a piezoelectric element such as a piezoelectric vibrator or a ceramic actuator that requires electrical continuity using an adhesive.

(Prior Art) A conventional piezoelectric element will be described with reference to FIGS. 3 and 4. FIG. 3 is a sectional view of a conventional example, and FIG. 4 is a sectional view of a piezoelectric element bonded together using the conventional example.

In FIG. 3, two electrode materials 2 are bonded to a thin metal plate 3 using an adhesive 4 on a piezoelectric element 1. As shown in FIG. Fourth
In Figure (b), the electrode material 2 on the piezoelectric element shown in Figure 3 is pasted together in a bimorph shape using an adhesive 4. By applying a voltage to the piezoelectric vibrator ceramic actuator configured in this manner, displacement can be obtained.

(Problems to be Solved by the Invention) The above configuration has the drawback that it is difficult to obtain a contact point on the bonding surface between the piezoelectric element and the thin metal plate or the piezoelectric element, resulting in poor electrical continuity and unstable characteristics.

An object of the present invention is to provide a piezoelectric element that eliminates the conventional drawbacks, uniformly increases the number of contact points on the adhesive surface between the piezoelectric element and the thin metal plate or the piezoelectric element, improves electrical continuity, and stabilizes the characteristics. That's true.

(Means for Solving the Problems) The piezoelectric element of the present invention has an electrode material having a particle size of 5 to 10I! Wa
This is a mixture of metal oxides.

(Function) With the above configuration, the number of contact points on the bonding surface between the piezoelectric element and the thin metal plate or the piezoelectric element increases uniformly, and electrical conductivity failure does not occur, and the characteristics are stabilized.

(Example) An example of the present invention will be described based on FIGS. 1 and 2. FIG. 1 is a sectional view of the piezoelectric element of the present invention, and FIG.
) is a cross-sectional view of the piezoelectric element and thin metal plate bonded together, and Figure 2 (
b) is a sectional view of piezoelectric elements bonded together. Note that the same parts in the conventional example shown in FIG. 3 and FIGS.

In FIG. 1, a piezoelectric element 1 is baked or electrolessly plated on an electrode material 2 containing 5 to 20% of metal oxide 5 having a particle size of 5 to 1000 ml.

In FIG. 2(a), the piezoelectric element 1 and electrode material 2 shown in FIG. 1 are bonded to a thin metal plate 3 using an adhesive 4. In FIG.

In FIG. 2(b), two pieces of the piezoelectric element 1 and the electrode material 2 shown in FIG. 1 are bonded together with an adhesive 4. In FIG.

As described above, according to this embodiment, on the bonding surface between the piezoelectric element and the thin metal plate or the piezoelectric element.

The adhesive layer is about 2 to 31M, and the electrode surface of the piezoelectric element is about 5M.
Since the thickness is ~10μ, the contact points on the bonding surface will surely make contact,
In addition, since the number of contacts is increased compared to conventional products, there is no possibility of electrical continuity failure, and the electrical characteristics are good and stable.

(Effects of the Invention) According to the present invention, the bonding surfaces of a piezoelectric vibrator and a ceramic actuator using a piezoelectric element containing 5 to 20% of metal oxide with a particle size of 5 to 10 particles in the electrode material have a reliable contact point. Since the number of contact points increases, electrical continuity becomes good and the characteristics become stable, which has a great practical effect.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a piezoelectric element according to an embodiment of the present invention, FIG. 2(a) is a sectional view of the piezoelectric element shown in FIG. 1 and a thin metal plate laminated together, and FIG. 3 is a cross-sectional view of a conventional piezoelectric element; FIG. 4(a) is a cross-sectional view of the piezoelectric element and thin metal plate shown in FIG. 3; (b) is a sectional view of the piezoelectric elements bonded together. 1... Piezoelectric element, 2... Electrode material. 3... Thin metal plate, 4... Adhesive, 5... Metal oxide. Figure 2 Patent applicant: Matsushita Denkin Sangyo Co., Ltd.

Claims (1)

[Claims] A piezoelectric element characterized in that a metal oxide having a particle size of 5 μm to 10 μm is blended into the electrode material of the piezoelectric element.