JPH05226723A - Simply packaged electrostrictive effect device - Google Patents

Abstract

PURPOSE:To replace only one damaged device with a new one when an overall electrostrictive effect device has broken down, by dividing the electrostrictive device into more than one device and drawing a lead from each device to the outside of a case. CONSTITUTION:One end of electrostrictive effect devices 2a and 2b joined vertically in a pair and inserted in a cylindrical metallic case made of stainless steel is bonded by an adhesive to an upper disk-shaped fitting 3 made of stainless steel while the other end thereof is bonded to a lower disk-shaped fitting 4, which has holes 4a on its right and left sides for passing each lead through. The lower fitting 4 is fixed by spot welding to the metallic case 1. Each lead 5a or 5b from the electrostrictive device 2a or 2b is drawn out through the holes 4a to the outside of the case. The upper fitting 3 moves along the inside sliding face of the metallic case 1 so that the displacement and force are transmitted to another member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple exterior type electrostrictive effect element, and more particularly to a cased electrostrictive effect element.

[0002]

2. Description of the Related Art In a conventional electrostrictive effect element, as shown in FIG. 3, an electrostrictive material 8 having a thickness of about 0.1 mm and an internal electrode 9 having a thickness of about 10 μm are alternately laminated. On the exposed pair of side surfaces, the end surfaces of the internal electrodes 9 are alternately arranged and alternately insulated on each side by an insulating layer 10 such as glass, and the non-insulated internal electrodes are formed on each side by silver paste or the like. It is electrically connected by the constituted external electrode 11. At this time, when a voltage (150 V) is applied to the lead wire 5 connected to each external electrode with the solder 12, a displacement of about 20 μm is generated in the electrostrictive effect element having a length of 20 mm. Normally, the electrostrictive effect element is coated with epoxy resin 13 except for the upper and lower end surfaces so that the external electrodes, the insulating layer, and the internal electrode end surfaces do not come into direct contact with the outside air. This is because the electrostrictive effect element has a structure in which the internal electrodes are exposed on the side surface at intervals of 0.1 mm, and since a high voltage of 150 V is applied between the internal electrodes, water or an ionic substance is attached. This is to prevent the drawback that the insulating property is deteriorated. However, it is difficult to completely prevent the intrusion of moisture and contaminants with epoxy resin, and it can be said that the reliability has been greatly improved (about one digit) compared with the initial development of the electrostrictive effect element, but general electronic parts Compared with, the electrostrictive effect element of this structure has a drawback of low reliability.

As one method for improving the drawbacks of such a resin-clad element, a simple packaged electrostrictive effect element that completely shuts off outside air has been devised as shown in FIG.

This simple exterior type electrostrictive effect element comprises an electrostrictive effect element 2 inserted in a cylindrical metal case 1 made of stainless steel.
An upper metal fitting 3 made of a stainless steel disc having a thickness of about 5 mm and a lower metal fitting 4 having a discoid shape made of a stainless steel having a thickness of about 5 mm and having a hole 4a through which a lead wire penetrates on the left and right sides are adhered to both end surfaces by an adhesive. The lower metal fitting 4 and the metal case 1 are fixed to each other by spot welding. At this time, the upper metal fitting 3 is the metal case 1
The inner surface of the guide slides to displace the electrostrictive effect element,
You can transfer your power to other things.

[0005]

In the conventional simple exterior type electrostrictive effect element described above, since the electrostrictive effect element inserted in the case has an integral structure, (1) after assembly, during screening or shipping inspection. When the electrostrictive effect element in the case fails, all electrostrictive effect elements must be replaced even if the location of the failure is small. (2) If the electrostrictive effect element fails during use, it cannot be driven at all, and the displacement and force cannot be transmitted to other objects. There were the above problems.

It is an object of the present invention, if a failure occurs in the electrostrictive effect element in the case after assembly, screening or shipping, only the element including the failed location can be replaced and the element can be charged during use. When a failure occurs in the strain effect element, only the element including the location of the failure cannot be driven, and the displacement and force lost by voltage control of other electrostrictive effect elements are compensated for It is to provide an electrostrictive effect element capable of transmitting.

[0007]

In the simple exterior electrostrictive effect element of the present invention, a lid member is adhered to both ends of the electrostrictive effect element inserted in a cylindrical case, and either one of the lid members is attached. In a simple exterior electrostrictive effect element fixed to the case, the electrostrictive effect element is divided into a plurality of parts, and lead wires are drawn out from the respective elements to the outside of the cylindrical case. ..

[0008]

The present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional view of a simple exterior electrostrictive effect element according to an embodiment of the present invention and a plan view from the lower metal fitting side.

As shown in FIG. 1, a stainless steel disk having a thickness of about 5 mm is formed on both end surfaces of electrostrictive effect elements 2a and 2b vertically inserted in a cylindrical metal case 1 made of stainless steel. -Shaped upper metal fitting 3 and a lower metal fitting 4 having a hole 4a through which a lead wire penetrates on the left and right and made of a stainless steel disk having a thickness of about 5 mm are adhered with an adhesive, and the lower metal fitting 4 and the metal case 1 are attached.
And are fixed by spot welding.

The lead wires 5a and 5b drawn from the individual electrostrictive effect elements 2a and 2b are drawn to the outside of the case through the holes 4a.

The upper metal fitting 3 slides by using the inner surface of the metal case 1 as a guide, and can transmit the displacement and force of the electrostrictive effect elements 2a and 2b to another object.

FIG. 2 is a vertical sectional view of another embodiment of the present invention. As shown in FIG. 2, in the present embodiment, S of about 5 mm in thickness is formed on both end faces of the electrostrictive effect elements 2a, 2b, 2c vertically inserted in a cylindrical metal case 1 made of stainless steel.
Circular O-ring 6 with K material (hardened hardness H _RC 58 or higher) 6
A disc-shaped grooved upper metal fitting 7 having a V-shaped groove for holding the metal and a lower metal fitting 4 made of an SK material having a thickness of about 5 mm and having a disk-shaped hole 4a through which lead wires pass through on the left and right are bonded with an adhesive. The lower metal fitting 4 and the metal case 1 are fixed by spot welding.

Each electrostrictive effect element 2a, 2b, 2c
The lead wires 5a, 5b, 5c pulled out from are pulled out of the case through the holes 4a of the lower metal fitting 4 as in the first embodiment. In this embodiment, the electrostrictive effect element inserted in the case is divided into three parts. Further, since the grooved upper fitting 7 and the metal case are sealed by the O-ring, and the displacement of the electrostrictive effect element is transmitted to the outside by the deformation of the O-ring, the airtightness is improved as compared with the above-mentioned embodiment.

In the above-mentioned embodiments, the case and lid members are made of stainless steel and SK material, but other metals and ceramics and high strength and high elasticity organic polymer materials (so-called engineering plastics) are used. May be.

Further, after the case and the lid member (in this embodiment, the metal case and the lower die) are fixed, the space between the case and the lid member is sealed with a sealing material so that the inside of the case is further improved. Airtightness can be improved.

[0016]

As described above, the simple exterior type electrostrictive effect element of the present invention has a structure in which the electrostrictive effect element to be put in the case is divided into a plurality of parts, and the lead wire is drawn out from each of them. Compared with the external electrostrictive effect element, (1) If a failure occurs in the electrostrictive effect element in the case during screening or shipping inspection after assembly, it is possible to replace only the element including the failed location. The material cost caused by the replacement is smaller than that of the conventional integrated structure by a plurality of divisions. (2) Further, when a failure occurs in the electrostrictive effect element during use, only the element including the failed location cannot be driven,
By controlling the voltage of other electrostrictive effect elements, the lost displacement and force can be compensated, and the normal displacement and force can be transmitted to other objects. The effect is obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an embodiment of the present invention and a plan view from the lower metal fitting side thereof.

FIG. 2 is a vertical sectional view of another embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view of an example of a conventional resin-coated circular strain effect element.

FIG. 4 is a vertical sectional view of an example of a conventional simple exterior type electrostrictive effect element and a plan view from the lower metal fitting side.

[Explanation of symbols]

 1 Metal Case 2 Electrostrictive Effect Element 3 Upper Metal Fitting 4 Lower Metal Fitting 4a Hole 5 Lead Wire 6 O-Ring 7 Upper Metal Fitting with Groove 8 Electrostrictive Material 9 Inner Electrode 10 Insulating Layer 11 External Electrode 12 Solder 13 Epoxy Resin

Claims (1)

[Claims] 1. A simple exterior electrostrictive effect element in which a lid member is adhered to both ends of an electrostrictive effect element inserted in a cylindrical case, and one of the lid members is fixed to the case. A simple exterior electrostrictive effect element, characterized in that the electrostrictive effect element is divided into a plurality of pieces, and a lead wire is drawn out of the cylindrical case from each element.