JPH0556033B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention includes a laminate in which ceramic layers and internal electrodes are alternately laminated, and the laminate has two opposing ceramic layers with exposed end portions of the internal electrodes. An electrostrictive device in which an external electrode layer is formed on a side surface to connect the ends of the internal electrodes every other layer, each end has an electrode led out from the opposing surface, and the laminate is covered with an insulating resin layer. The present invention relates to a method of manufacturing an effect element.

[Conventional technology]

Conventionally, in the manufacturing method of an electrostrictive effect element, as a method of covering the ends of the internal electrode layer, masking is used to prevent the insulating exterior resin 6 from adhering to the upper and lower end surfaces of the electrostrictive effect element 1, as shown in FIG. Sandwich the electrostrictive effect element 1 with the jig 7 and hold the electrostrictive effect element 1 approximately 100 times.
The exterior resin 6 was attached by a fluidized dipping method in which the resin powder was heated to 0.degree.

[Problem that the invention seeks to solve]

The conventional method for manufacturing an electrostrictive element described above has the following drawbacks.

(1) When the entire side surface of the electrostrictive element 1 is covered with the exterior resin 6, the unevenness of the edges of the exterior resin 6 makes it possible to attach the electrostrictive element 1 to the element mounting member 11 as shown in FIG. At this time, the exterior resin 6 enters the joint between the recess of the element mounting member 11 and the end face of the electrostrictive element 1, and the perpendicularity and adhesion between the electrostrictive element 1 and the element mounting member 11 deteriorate. Therefore, bending stress and shear stress are applied to the electrostrictive effect element 1, and the element breaks during a screening test while mounted on the element mounting member 11.

(2) Since the masking jig 7 is also heated and immersed in the resin powder, the resin powder adheres to the masking jig 7 as well as the electrostrictive element 1 and hardens, so the element must be removed and the element burred. Also, a huge amount of time is spent removing the resin 6 adhering to the jig.

[Means for Solving the Problems] The method for manufacturing an electrostrictive effect element of the present invention includes a step of masking both end faces and other four side faces of a laminate by a certain dimension from both ends, and a process of masking the laminate by an electrostatic coating method. The method includes a step of applying powder to a body, and a step of heating and curing the powder.

(Function) The present invention uses an electrostatic coating method to omit finishing and correction steps after the exterior resin is thermoset, thereby removing exterior resin adhering to the masking jig before the resin hardens, and printing The ends of the electrostrictive element are coated with resin so that the outer resin is not interposed at the joint between the element mounting member such as the head and the electrostrictive element.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view of an embodiment of an electrostrictive element manufactured by the manufacturing method of the present invention, FIG. 2 is a perspective view of the electrostrictive element of FIG. 1 before the packaging process, and FIG.
FIG. 4 is a diagram showing the manufacturing process of the electrostrictive effect element of FIG. 1.

In the laminated electrostrictive effect element 1, internal electrode tanks 2 and electrostrictive material layers 3 are alternately laminated, and the exposed ends of the internal electrode layers 2 on two opposing sides are covered with an insulating layer 4 every other layer.
Further, a conductive external electrode layer 5 is formed.

Next, a method of manufacturing this electrostrictive element 1 will be explained.

First, mask the end face and four side faces of the electrostrictive element 1 by applying the element holding plate 9 to the side face of the electrostrictive element 1 using a masking jig 7 made of insulating resin such as Teflon about 0.5 mm from the end face. (Figure 3). At this time, the electrostrictive effect element 1 is
A ground connection terminal 8 is inserted across the end face of the electrostrictive element 1 to connect it to the ground. Next, the masking jig 7 is installed on the top of the resin powder tank 10, and the
A high voltage of 50KV is applied to charge the resin powder. Next, the resin powder is blown around the electrostrictive element 1 from the lower part of the resin powder tank 10 using an air pressure of about 0.5 kg/cm ² and the resin powder is attached to the electrostrictive element 1 by electrostatic force. Finally, the resin powder adhering to the masking jig 7 is removed and thermally cured in a constant temperature bath (not shown) to produce the electrostrictive element 1 as shown in FIG.

〔Effect of the invention〕

As explained above, in the present invention, by uncoating the ends of the exterior resin, the joining to the element mounting member is performed precisely, and there is no need to finish or modify the exterior resin at the end of the electrostrictive element. This has the effect of significantly reducing costs.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of an electrostrictive effect element manufactured by the manufacturing method of the present invention, FIG. 2 is a perspective view of the electrostrictive effect element 1 of FIG. Figure 4 is a diagram showing the manufacturing process of the electrostrictive effect element in Figure 1, Figure 5 is a cross-sectional view of the electrostrictive element mounted on the element mounting member, and Figure 6 is the electrostrictive effect produced by the conventional manufacturing method. FIG. 3 is a cross-sectional view of the element. 1... Electrostrictive effect element, 2... Internal electrode layer, 3...
... Electrostrictive material layer, 4 ... Insulating layer, 5 ... External electrode layer,
6... Exterior resin, 7... Masking jig, 8...
Earth connection terminal, 9...Element holding plate, 10...Resin powder tank, 11...Element mounting member.

Claims (1)

[Scope of Claims] 1. A laminate in which ceramic layers and internal electrodes are alternately laminated, and the internal electrode ends are placed one layer apart on two opposing sides of the laminate where the internal electrode ends are exposed. In the method for manufacturing an electrostrictive effect element, the laminate is coated with an insulating resin layer, the laminate is coated with an insulating resin layer, the laminate is coated with an insulating resin layer, and the laminate is coated with an insulating resin layer. It is characterized by comprising the steps of masking both end faces and the other four side surfaces by a certain dimension from both ends, applying powder to the laminate by electrostatic coating, and curing the powder by heating. A method for manufacturing an electrostrictive element.