JPS63308838A - Piezoelectric relay - Google Patents

Abstract

PURPOSE:To secure such a piezoelectric relay that is resistible to dust and humidity by supporting and fixing the piezoelectric unimorph fitted with a traveling contact, while casing the unit fitted with a fixed contact and input- output terminals in a casing case. CONSTITUTION:A sheetlike piezoelectric element is stuck to a conductive flexible plate 7 of metal or the like. A piezoelectric unimorph 5 similar to a disc or a round form, being fitted with a traveling contact 8 is supported and fixed, while a piezoelectric relay unit being fitted with a fixed contact and input-output terminals 11 is case in a casing, covering this piezoelectric unit. Here at the time of supporting and fixing the unimorph 5 directly to a flat surface of a support part 9a of a mount 9, when one thid of the outer diameter is supported and fixed, displacement and displacement load of the unimorph 5 can be efficiently taken out.

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 a bending action 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, so there has recently been a strong trend to try to use the distortion phenomenon of piezoelectric elements in relays to save power. It has become.

Hereinafter, a conventional piezoelectric relay will be described with reference to the drawings. Conventionally, this type of piezoelectric relay is shown in Figs. 3 and 4.
The configuration was as shown in the figure. In FIGS. 3 and 4, 1 is a thin plate-shaped piezoelectric element 2! A support stand that supports bimorph 2 formed by pasting L and 2b together; 3 is bimorph 2;
4 indicates a movable contact attached to the tip of the support base 1, and 4 indicates a fixed contact attached to the support base 1.

The operation of the conventional piezoelectric relay configured as described above will be described below. Now, when an input voltage is applied from other control parts (not shown) such as a timer to the bimorph 2 formed by bonding the piezoelectric elements 21L and 2b, the bimorph 2 will move as shown by the two-dot chain line in FIG. (This phenomenon is well known and the principle itself is not directly related to the present invention, so the explanation along with the wiring will be omitted.)

At this time, the movable contact 3 provided at the tip of the bimorph 2 comes into contact with the fixed contact 4 provided on the support base 1, and another control component wired to the movable contact 3 and the fixed contact 4 respectively turns ON.
When the input voltage applied to the bimorph 2 is released, the bimorph 2 returns to its original state, the movable contact 3 and the fixed contact 4 are separated, and the OFF state is reached, causing the control parts to become OFF. It will stop working.

Further, even when a piezoelectric unimorph formed by bonding a thin plate-like piezoelectric element to a conductive deflection plate is used, the structure and operation are almost the same.

Problems to be Solved by the Invention In such a conventional configuration, there is no covering for the piezoelectric element and the contacts, so it is susceptible to dust and moisture, and the piezoelectric element, movable contacts, and fixed contacts are easily damaged during handling. was easy to destroy.

The present invention solves these problems and aims to provide a piezoelectric relay that is resistant to dirt and moisture and is easy to handle.

Means for Solving the Problem In order to solve this problem, the present invention provides a disk or circular plate made by laminating a thin plate-like piezoelectric element to a conductive deflection plate made of metal or the like, and having a movable contact attached thereto. A piezoelectric relay unit, in which a piezoelectric unimorph similar to the above is supported and fixed, and a fixed contact, an input terminal, and an output terminal are attached, is housed in a casing case, and the piezoelectric relay unit is covered.

action This configuration allows piezoelectric unimorphs and movable contacts.

This means that the fixed contacts can be covered from the outside.

Embodiment FIG. 1 is a configuration diagram showing a piezoelectric relay according to an embodiment of the present invention, and FIG. 2 is a perspective view thereof.

In FIGS. 1 and 2, reference numeral 5 denotes a piezoelectric unimorph having a shape similar to a disk or circle, which is constructed by bonding a thin plate-like piezoelectric element 6 to a deflection plate 7 made of a conductive material such as metal; 9 is a movable contact attached to the tip of the piezoelectric unimorph 6, and 9 is the outer diameter of the piezoelectric unimorph 6.
10 is a fixed contact attached to the base 9, and 11 is a fixed contact mounted on the base 9. These are the input and output terminals attached to the Reference numeral 12 designates a casing case for casing the piezoelectric relay unit 13 on which the fixed contact 1o, the piezoelectric unimorph 6, and the terminal 11 are attached to the base 9. Further, the input terminal and output terminal 11 are electrically connected to the piezoelectric element 6, the deflection plate 7, and the contacts 8 and 1o by lead wires (not shown) or the like.

Here, when the piezoelectric unimorph 6 is directly supported and fixed on the plane of the support part 9a of the stand 9, if the outer diameter of about V3 is supported and fixed, the displacement amount and displacement load of the piezoelectric unimorph 6 can be efficiently handled. You can get the effect of being able to produce it.

Effects of the Invention As described above, according to the present invention, a piezoelectric unimorph having a movable contact is supported and fixed, and the unimorph having a fixed contact, an input terminal, and an output terminal is cased in a casing case. Since the piezoelectric unimorph, the movable contact, and the fixed contact can be covered from the outside, it is possible to provide a piezoelectric relay that is resistant to dust and moisture, and is easy to handle.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a piezoelectric relay according to an embodiment of the present invention, FIG. 2 is a perspective view thereof, FIG. 3 is a block diagram showing a conventional piezoelectric relay, and FIG. 4 is a plan view thereof. 5...Pressure! Unimorph, 6...Piezoelectric element, 7...Conductive bending plate, 8...Movable contact, 9...Mounting base, 9a...・Support part, 1o...Fixed contact, 11...Input terminal and output terminal, 12...Casing case,
13...Piezoelectric phosphor unit. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3

Claims (1)

[Claims] It supports and fixes a piezoelectric unimorph resembling a disk or a circle, which is made by laminating a thin piezoelectric element to a conductive bending plate made of metal and attaching movable contacts, and also connects the fixed contacts, input terminals, and output terminals. A piezoelectric relay in which the attached piezoelectric relay unit is cased in a casing case and the piezoelectric relay unit is covered.