JPS63308835A - Piezoelectric relay - Google Patents

Abstract

PURPOSE:To perform such contact operation that is high in reliability by supporting and fixing a conductive flexible plate directly to a support block plane in a way of sticking a specific rate of the outer diameter with a bonding agent, and installing a traveling contact, performing the contact operation, in a movable part of a piezoelectric unimorph. CONSTITUTION:A conductive flexible plate of a piezoelectric unimorph similar to a disc of a round form made up of sticking a sheetlike piezoelectric element to the flexible plate 7 is supported and fixed directly to a support block plane in a way of sticking one-third or so of the outer diameter with a bonding agent, and a traveling contact, performing contact operation, is installed in a movable part of the unimorph. That is to say, when voltage is impressed on input wires 6a and 6b connected each to the flexible plate 7 and the piezoelectric element 8, the piezoelectric element is bent whereby the traveling contact 3 comes into contact with a fixed contact 5, and these wires are come into a state of being turned on, and when this voltage impression is released, the traveling contact 3 comes off the fixed contact 5 and they come off. Thus, the support block and the piezoelectric unimorph are fixed by bonding so that stable bending operation is maintainable.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a piezoelectric relay that is used as a relay circuit for various industrial electronic control devices and utilizes distortion caused by an electrical load on a piezoelectric element.

Conventional technology In recent years, electronic devices have become more and more power-saving, and conventional electromagnetic relay devices consume a lot of power.Recently, there has been a trend to utilize the distortion phenomenon of piezoelectric elements in relays to save power. I'm getting stronger.

Hereinafter, a conventional piezoelectric relay will be described with reference to the drawings. Conventionally, this type of piezoelectric relay has had a configuration as shown in FIG. In Fig. 2, 1 is a piezoelectric element, 2 is a metal deflection plate bonded to the piezoelectric element 1, 3 is a movable contact attached to the deflection plate 2, and 4 is composed of the piezoelectric element 1 and the deflection plate 2. A support base that supports a piezoelectric unimorph with a shape similar to a disk or a circle, and has movable contacts 3
A fixed contact 5 is attached at a position facing the.

Input wires 61L and 6b apply voltage to the piezoelectric element 1, and are directly connected to the deflection plate 2 and the piezoelectric element 1, respectively.

The operation of the conventional piezoelectric relay configured as described above will be described below. Now, piezoelectric element 1 and deflection plate 2
When a voltage is applied from the input wires 6a and 6b to the piezoelectric unimorph consisting of (The explanation is omitted as it is not relevant.)

At this time, the movable contact 3 provided on the deflection plate 2 comes into contact with the fixed contact 6 provided on the support base 4, and another control component (not shown in the figure) wired to the movable contact 3 and the fixed contact 6, respectively. )
turns ON and operates, and conversely, when the input voltage applied to the piezoelectric unimorph is released, the piezoelectric unimorph returns to its original state, and the movable contact 3 and fixed contact 5 are separated and turned OFF, causing control. This will cause the parts to stop working.

Problems to be Solved by the Invention In such a conventional configuration, as shown in FIG. Therefore, a groove for fixing the piezoelectric unimorph is required in the support base 4, which complicates the mold structure and increases the cost of the molded product. Difficult situations occurred, or conversely, wobbling occurred during assembly, and contact operation was extremely unstable.

The present invention solves these problems, and reduces costs by simplifying assembly and components, securely fixes the piezoelectric unimorph to a support base, and provides stable contact operation. The purpose of this is to improve the reliability of the system.

Means for Solving the Problem In order to solve this problem, the present invention provides a piezoelectric unimorph similar to a disk or a circle, which is formed by bonding a thin piezoelectric element to a conductive bending plate made of metal or the like. A flexible deflection plate is supported and fixed by bonding approximately one-third of its outer diameter directly to the plane of a support base with an adhesive, and a movable contact that performs contact operation is provided on the movable part of the piezoelectric unimorph. .

Function: According to this configuration, the piezoelectric unimorph can be bonded directly to the flat surface of the support base using adhesive, which makes assembly extremely easy, and together with component materials, it is possible to reduce the total cost. Since it can be securely fixed, the bending motion of the piezoelectric unimorph is stabilized, and as a result, the reliability of the contact operation is increased.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 shows a piezoelectric relay according to an embodiment of the present invention, and the same parts as in FIG. 2 of the conventional example are given the same numbers. In FIG. 1, reference numeral 7 denotes a deflection plate made of a conductive material such as metal, and a piezoelectric element 8 in the form of a thin plate is bonded to the deflection plate 7 to form a piezoelectric unimorph. Reference numeral 9 denotes a support base, which has a position fixing groove 9a in its flat surface, and the piezoelectric unimorph is fixed to this groove 9a with an adhesive 1o.

The operation will be explained below with reference to FIG.

In FIG. 1, when a voltage is applied to the input wires 6a and 6b connected to the deflection plate 7 and the piezoelectric element 8, respectively, as in the conventional example, the piezoelectric unimorph bends, and the bending operation of the piezoelectric unimorph is known as in the conventional example. Therefore, the explanation is omitted)
, the movable contact 3 and the fixed contact 6 come into contact and become in the ON state,
When the voltage application is released, the movable contact 3 and the fixed contact 6 are separated and are in the OFF state.

Here, when directly supporting and fixing the conductive deflection plate that makes up the piezoelectric unimorph on the plane of the support base, the reason why it is set to about one-third of its outer diameter is to efficiently reduce the amount of displacement and displacement load of the piezoelectric unimorph. This is because it can be taken out easily.

Effects of the Invention As described above, according to the present invention, since the piezoelectric unimorph is directly bonded to the support base, the structure of the support base is simplified, mold and component costs can be reduced, and the piezoelectric unimorph can be easily assembled. It can be securely fixed to the support stand with adhesive, and costs can be significantly reduced by reducing assembly man-hours. In addition, by fixing the support base and piezoelectric unimorph with adhesive,
It is possible to maintain stable bending operation and to obtain extremely reliable contact operation of the piezoelectric relay. Furthermore, since the piezoelectric unimorph is bonded directly to the flat surface of the support base, it is easy to connect the piezoelectric unimorph and the input wire, and the thickness can be reduced, making it possible to incorporate it into printed circuit boards, etc., which has extremely high practical value. It's expensive.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a piezoelectric relay according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional piezoelectric relay. 3...Movable contact, 6...Fixed contact, 6
a, 6b... Input electric wire, 7... Conductive deflection plate, 8... Piezoelectric element, 9... Support stand, 9a...・Groove, 1Q...Adhesive. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] The conductive deflection plate of a circular disk or a piezoelectric unimorph resembling a circle, which is made by pasting a thin piezoelectric element on a conductive deflection plate made of metal, is directly placed on the plane of the support base by about one-third of its outer diameter. A piezoelectric relay that is supported and fixed by being bonded together with an adhesive, and is provided with a movable contact that performs a contact operation on a movable part of the piezoelectric unimorph.