JPH0331087Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electrostrictive laminate formed by laminating a large number of electrostrictive element plates vertically.

Such an electrostrictive laminate is formed by vertically connecting electrostrictive element plates that produce vertical strain when a voltage is applied, and superimposing the vertical strain of the electrostrictive element plates.
The end face is made to expand and contract.

By the way, as shown in FIG. 4, the conventional electrostrictive laminate a is made up of stacked electrostrictive elements c, each having electrodes b and b on the upper and lower sides, and the electrostrictive elements c of the laminate a are arranged in parallel. In order to make a connection, an electrode plate is interposed in the connecting part, and connection branches d and e are alternately protruded from the electrode plate, for example, to the left and right sides, and the connection branch d on one side is
The group is connected to one terminal f, and the connecting branch e group on the other side is connected to the other terminal g, so that a voltage is applied between the terminals f and g. For this reason, the electrode structure becomes complicated, and electrical processing is troublesome, such as connecting the connecting branches d and e that protrude in the vertical direction to the lead wires, and many connecting pieces protrude from the sides of the laminate. However, there have been drawbacks such as various restrictions when assembling the laminate into a required device.

The present invention aims to eliminate the above-mentioned conventional drawbacks, and provides an electrostrictive laminate in which a large number of electrostrictive element plates are stacked vertically and each electrostrictive element plate is electrically connected in parallel. A supply electrode covering most of the connecting surface and a connecting electrode covering a small edge of the connecting surface are electrically insulated and integrally arranged on the upper and lower connecting surfaces of the electrostrictive element plate, The supply electrode on one side is connected to the connection electrode on the other side, and the connection electrode on one side is connected to the supply electrode on the other side, respectively, and the electrode arrangement on the corresponding connection side of the vertically adjacent electrostrictive element plates is determined. The upper and lower sides are matched, and the electrical connection of each electrostrictive element is performed at the same time as the stacking in the vertical direction, thereby simplifying the wiring configuration.

An embodiment of the present invention will be described with reference to the accompanying drawings.

Reference numeral 1a denotes an electrostrictive element plate constituting the electrostrictive laminate A, and a connecting surface 2a on the upper surface thereof is provided with a supply electrode 3 that covers almost the entire surface, and a supply electrode 3 is provided at the center of the left end of the supply electrode 3 in the figure. It has a rectangular cutout, and a rectangular connection electrode 4 is provided in the cutout in a non-contact manner with the supply electrode 3. Further, a supply electrode 6 is provided on the connecting surface 5a on the lower surface of the supply electrode 6, which covers substantially the entire surface thereof, and has a rectangular cutout in the center of the right end portion of the supply electrode 6 in the figure, and the supply electrode A rectangular connecting electrode 7 is provided in a non-contact manner with the connecting electrode 6 . The connecting surface 2a
The connecting electrode 4 is connected to the supply electrode 6 on the connecting surface 5a through a conductive path 8 on the left side of the electrostrictive element plate 1,
Further, the connection electrode 7 on the connection surface 5a is electrically connected to the supply electrode 3 on the connection surface 2a through a conductive path 9 on the right side.

The electrostrictive element plate 1b adjacent to the upper or lower part of the electrostrictive element plate 1a is in a relationship where the electrostrictive element plate 1a is turned over in the front-rear direction in the figure, so that the electrostrictive element plate 1b is connected to the connecting surface 2a at the upper part. A connecting electrode 4 is arranged at the left end of the connecting surface 2b of the strain element plate 1b, and a connecting electrode 7 is arranged at the right end of the connecting surface 5b of the electrostrictive element plate 1b, which is connected to the connecting surface 5a at the lower part. As a result, the upper and lower electrode arrangements are the same. In this case, the electrostrictive element plates 1a, 1 are made of ceramic material.
b, and if it is necessary to polarize in the vertical direction in advance, for example, if the connecting surface 2 is uniformly polarized so that the connecting surface 2 is the positive electrode and the connecting surface 5 is the negative electrode, by turning over and stacking as described above. Like-minded people will always join together.

When a large number of electrostrictive element plates 1a and 1b, which are upside down, are alternately stacked in the vertical direction as shown in FIG. The electrodes are joined at the top and bottom, respectively. For this reason, the supply electrodes 3 arranged at every other location in the connecting portion are connected to each other via the connection electrodes 7, and the supply electrodes 6 are connected to each other via the connection electrodes 4. In addition, each electrostrictive element plate 1
a and 1b are integrally bonded together by various known means such as applying an adhesive on their side surfaces.

Note that, as a matter of course, the above-mentioned electrodes 3, 4, 6, and 7 and the conductive path 9 are integrally provided on the electrostrictive element plates 1a and 1b.

The electrode plate 10a is connected to the supply electrode 3 at the connection part at one end of the electrostrictive laminate A, and the electrode plate 10b is connected to the supply electrode 6 at the connection part at the other end. Lead wires 12, 12 are connected to connecting branches 11, 11 protruding from the electrode plates 10a, 10b, and connected to output terminals 13, 14. With this configuration, each electrostrictive element plate 1 is connected in parallel, and by applying a voltage to the output terminals 13 and 14, the supply electrode 3 and the supply electrode 6 on the upper and lower surfaces of each electrostrictive element plate 1 are connected in parallel.
A voltage is applied to generate strain, and the electrostrictive laminate A expands and contracts in the vertical direction.

Figure 3 shows an electrostrictive element plate 1 with another electrode arrangement.
The upper connecting surface 2 is provided with a supply electrode 3 covering almost the entire surface thereof, and a rectangular connecting electrode 4 along the right edge of the supply electrode 3 in the figure. Also provided are a large-area supply electrode 6 connected to the connection electrode 4, and a connection electrode 7 connected to the supply electrode 3 along the left edge of the supply electrode 6 in the figure. In this case as well, by turning over the upper or lower electrostrictive laminate, the electrode arrangement will be the same on the upper and lower sides.

In addition, various electrode arrangements can be considered.

As clarified by the above explanation, the present invention has the upper and lower connecting surfaces 2a of the electrostrictive element plates 1a and 1b,
5a, 2a, 5b, supply electrodes 3, 6 that cover most of the connecting surfaces, and connection electrodes 4, 7 that cover the edges of the connecting surfaces are electrically insulated and arranged. The supply electrode 3 is connected to the connection electrode 7 on the other side, the connection electrode 4 on one side is connected to the supply electrode 6 on the other side, and the electrostrictive element plates 1a, 1 adjacent in the vertical direction are connected.
Since the electrode arrangement of the corresponding connecting surfaces 2a, 2b, 5a, 5b of b is made to match on the upper and lower sides, the upper and lower electrostrictive elements 1a, 1b can be connected in parallel, respectively, without the need for lead wiring due to the lamination. Been,
The electrical wiring becomes extremely simple, there is no need to protrude a large number of connecting branches from each connecting part, the appearance of the electrostrictive laminate A can be simplified, and restrictions on its installation can be removed as much as possible. It has excellent effects.

[Brief explanation of the drawing]

The accompanying drawings show an embodiment of the present invention, and FIG. 1 is a perspective view of electrostrictive element plates 1a and 1b, FIG. 2 is a longitudinal cross-sectional side view of the electrostrictive laminate A, and FIG. 3 shows another example of electrode arrangement. A perspective view of the electrostrictive element plate 1, FIG. 4 is a conventional laminate a
FIG. 1a, 1b: electrostrictive element plate, 2a, 2b, 5a,
5b: connection surface, 3, 6: supply electrode, 4, 7: connection electrode.

Claims (1)

[Scope of utility model registration request] In an electrostrictive laminate in which a large number of electrostrictive element plates are stacked vertically and the electrostrictive element plates are electrically connected in parallel, most of the connecting surfaces are located on the upper and lower connecting surfaces of the electrostrictive element plates. The supply electrode covering the connecting surface and the connecting electrode covering the small edge of the connecting surface are electrically insulated and integrally arranged, and the supply electrode on one side is connected to the connecting electrode on the other side, and the connecting electrode on the other side is electrically insulated and integrally arranged. An electrostrictive laminate characterized in that the electrodes are respectively connected to the supply electrodes on the other side, and the electrodes on the corresponding connecting surfaces of vertically adjacent electrostrictive element plates are made to match vertically.