JP2542302Y2 - Chip type varistor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip type varistor used for protecting electronic equipment from abnormal voltage.

[0002]

2. Description of the Related Art Conventionally, as a chip type varistor, for example, as shown in FIG. 5, lead members 3, 3 are connected to a plate-shaped varistor body 2 having electric plates 1, 1 formed on two opposing surfaces. A structure in which resin insulating layers 4 and 4 such as a mold resin are provided (for example, Japanese Patent Application Laid-Open No. 61-16 / 1986).
No. 501, Japanese Utility Model Application Laid-Open No. 63-24804).

[0003]

The above-described conventional chip type varistor has a problem that the assembling work on the chip is complicated and the working efficiency is not good.

An object of the present invention is to provide a chip type varistor in which the assembling operation is extremely simple in order to solve such problems.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a pair of lead terminal portions extending over the outer periphery from opposing inner surfaces of a concave portion for inserting a varistor element having a tapered opening end. A plate-shaped varistor element having electrodes formed on two opposing surfaces is inserted into the recess, and the lead terminal portion and the electrode are electrically connected. Features.

Further, the concave portion having the opening end tapered is provided on the upper surface or one side surface of the electric insulator block.

[0007]

According to the present invention, the electric insulator block can be manufactured by injection molding of a heat-resistant resin, and the lead terminal can be formed by electroless plating.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a vertical type chip varistor according to the present invention; FIG. FIG. 3 is a sectional view of a chip varistor of a horizontal type, and FIG. 4 is a perspective view of an electric insulator block of the type shown in FIG.

First, a vertical type chip varistor 1
1 will be described. As shown in FIG. 2, the electric insulator block 12 is formed in a cube by injection molding of a heat-resistant resin or the like, and a concave portion 15 for inserting a varistor element body 14 from the center of the upper surface 13 is provided. Have been.
It is preferable that the opening end of the concave portion 15 be a tapered portion 16 to facilitate the soldering operation as described later.

Then, a pair of lead terminal portions 17 and 1 extending from both inner side surfaces of the concave portion 15 facing each other to the outer periphery.
7 are formed respectively. In the case shown in the figure, the outer ends of the lead terminal portions 17, 17 are
It extends to eight. The lead terminals 17, 17 are formed by electroless plating.

The varistor element 14 is inserted into the recess 15 of the insulator block 12 having such a structure, and the varistor element 1
4, the electrodes 19, 19 on the surface and the ends of the lead terminal portions 17, 17 formed in the recess 15 are electrically connected by soldering 20, and a resin sealing layer 21 is formed in the recess 15;
The varistor element 14 is sealed.

Next, a horizontal type chip varistor 2
2 will be described. This type of insulator block 23
As shown in FIG. 4, a concave portion 24 is provided on a side surface 25. By providing the concave portion 24 on the side surface 25, one lead terminal portion 26 extends long to the bottom surface 27, and conversely, the other lead terminal portion 26 becomes short. Other configurations are the same as those of the vertical type described above, and are denoted by the same reference numerals and description thereof will be omitted.

In the chip type varistor having such a configuration, the varistor element body and the insulator block are separately formed in advance, and the varistor element body is inserted into the concave portion of the insulator block to form the varistor element body and the insulator block. Then, after soldering to the end of the lead terminal portion, an assembly for forming a resin sealing layer in the concave portion is performed.

[0014]

[Effect of the Invention] The present invention is configured as described above, so that soldering, resin sealing work and the like can be performed extremely simply.

Further, the concave portion into which the varistor element body is inserted,
By providing on the top or side of the insulator block,
A vertical type or a horizontal type can be arbitrarily selected, and the formation pattern of the lead terminal portion can be made to correspond to a desired electric device.

Further, since the opening end of the concave portion is formed as a tapered portion, the work of soldering to the varistor body becomes easy.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a vertical type chip varistor.

FIG. 2 is a perspective view of an electric insulator block used in the type of FIG.

FIG. 3 is a sectional view of a horizontal type chip varistor.

FIG. 4 is a perspective view of an electric insulator block used in the type of FIG. 3;

FIG. 5 is a sectional view of a conventional example.

[Explanation of symbols]

 12, 23 Electrical insulator block 14 Varistor element 15, 24 Concave part 17, 26 Lead terminal part

Claims (2)

(57) [Scope of request for utility model registration] 1. An electric insulator block having a pair of lead terminal portions extending from the opposed inner surfaces of a concave portion for inserting a varistor element body having a tapered opening end to an outer periphery thereof is provided. A chip-type varistor, wherein a plate-shaped varistor body having electrodes formed thereon is inserted into the recess, and the lead terminal portion and the electrode are electrically connected. 2. The recess having a tapered portion at the open end,
2. The chip type varistor according to claim 1, wherein the chip type varistor is provided on an upper surface or one side surface of the electric insulator block.