JP2538916Y2 - Ring type varistor body - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ring-type varistor body having electrodes formed on an outer peripheral surface thereof to constitute a ring-type varistor.

[0002]

2. Description of the Related Art Such a conventional varistor element 1
Has a ring shape having a circular hole 2 at the center as shown in FIG. 5, and by forming, for example, three divided electrodes 4 on the outer peripheral surface of the varistor element body 1,
A varistor is configured. In order to manufacture such a varistor, the step of forming the electrode 4 on the outer peripheral surface of the ring-shaped varistor element body 1 is performed, for example, as follows. First, as shown in FIG. 4, a plurality of ring-shaped varistor element bodies 1 are overlapped with a spacer f interposed therebetween.
The shaft a is passed through (see FIG. 5), flange washers c, c are applied to both sides, and fixed with bolts b, b. And applying a printing roller d rotating conductive paste is coated on the peripheral surface of the varistor body 1, while determining the angle of the electrode 4 to be printed by the rotation of the shaft a, the conductor paste of the printing roller d of the varistor element 1 Transfer to the outer peripheral surface. Thereafter, the electrode 4 is formed by baking this conductive paste. The printing and baking of such a conductive paste is performed, for example, by applying zinc or an alloy paste of zinc and silver to the varistor element 1.
Is printed on the peripheral surface of the varistor element body 1 and then baked.
Often repeated.

As the spacer f, a ring made of fluorine resin, ceramic, or the like having a smaller diameter than the varistor element body 1 is used. The use of such a spacer f
When the main surface of the varistor element 1 during printing of the conductive paste are in close contact with each other, penetration between the main surface of the varistor element 1 conductor paste was coated on the outer peripheral surface is in tension, the varistor element 1 The conductive paste adheres to unnecessary portions, resulting in poor printing or varistor element 1 after baking.
This is because troubles such as inability to separate them occur. Therefore, the ceramic bodies 1 are separated from each other by the spacers f.

[0004]

However, in the ring-shaped varistor element 1 as described above, a spacer must be inserted between the varistor elements 1 in advance in the step of printing electrodes on the outer peripheral surface. And it takes time to prepare for printing. Further, when the conductor paste is printed and baked twice to form the electrodes 4, the varistor element body 1 itself has no mark.
And the like, and the printing process is performed twice based on the position. However, there is a problem that the printing position easily shifts due to a shift between the shaft a and the varistor element 1. . In view of such a conventional problem, the present invention does not allow the conductive paste to spread onto the main surface of the varistor element without inserting a spacer between the varistor elements.
The electrode in the correct position is printed, and an object thereof is to provide a ring-shaped varistor capable baking.

[0005]

In order to achieve the above object, the present invention provides a ring-type varistor element for forming a ring-type varistor by forming an electrode on an outer peripheral surface. A ring-shaped varistor element characterized in that at least one of the main surfaces thereof has a projection locally projecting from the main surface . In this case, it is desirable to arrange three or more projections symmetrically with respect to the center of the ring-shaped body, and to arrange them at an intermediate position between the outer periphery and the inner periphery of the ring-shaped body.

[0006]

In the ring-shaped varistor element body, the projections are formed on the main surface thereof. Therefore, when the varistor element bodies are overlapped, the main surfaces of the varistor element bodies are brought into close contact with each other by the projections without using a spacer. Can be superimposed without any need. In addition, the protrusions extend from the main surface of the varistor body.
Because it is locally projected, it is adjacent to the tip of the projection.
The contact area with the main surface of the varistor element
The strike does not penetrate the main surface of the varistor body. Further, when the conductor paste is printed twice and baked, the projections can be used as marks of the ceramic body, so that the alignment in the two printings can be performed accurately.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings. 1A and 1B show examples of a varistor element body 1 according to the present invention, each of which has a ring shape having a circular hole 2 at the center. In FIG. 1A, three circular projections 3 are provided on the main surface of the varistor element 1. In FIG. 1B, four elliptical projections 3 are provided so as to project radially. In FIG.
Four fan-shaped projections 3 are provided. In either case, the projections 3, the center of the varistor element 1 are arranged symmetrically at equal angular intervals around the center of that is the hole 2, further varistor element
The body 1 is disposed at a position substantially intermediate between the outer periphery and the inner periphery.
As described above, each of the protrusions 3 is provided on the varistor element body 1.
It protrudes locally from the main surface. For example, the inner diameter of the varistor element body 1 is 2.38 to 9.50 mm, and the outer diameter is 4.
When the thickness is 45 to 18.0 mm and the thickness is 0.55 to 1.20 mm, the height of the protrusion 3 is 0.1 to 1.0 mm.

As shown in FIG. 3, a varistor as shown is formed by forming, for example, three divided electrodes 4 on the outer peripheral surface of such a varistor element body 1. FIG. 3 shows an example in which a varistor is configured using the varistor element body 1 shown in FIG. In order to manufacture such a varistor, the process of forming the electrode 4 on the outer peripheral surface of the ring-shaped varistor element body 1 and manufacturing the varistor includes:
For example, this is performed as follows. First, as shown in FIG. 2, ring-shaped varistor element bodies 1 are overlapped, a shaft a is passed through the center hole 2 (see FIG. 3), flange washers c and c are applied to both sides, and bolts b and Fix with b. In this state, the adjacent varistor element bodies 1 are in contact with each other via the projections 3. In this state, the rotating printing roller d in which the conductor paste is applied to the peripheral surface of the varistor element body 1
The conductive paste of the printing roller d is transferred to the outer peripheral surface of the varistor element body 1 while determining the angle of the electrode 4 to be printed by the rotation of the shaft a. After that, the conductor paste is baked to form the electrode 4, and a varistor is formed as shown in FIG.

In FIG. 2, reference symbol e denotes the varistor element.
This is a sensor for detecting a specific projection 3 protruding from the body 1 and determining a printing position of the conductive paste based on the detected position. With this sensor e, a specific projection 3
The angle of the varistor element body 1 is adjusted with reference to, for example,
The printing positions of the first and second conductive pastes are accurately aligned. The present invention is not limited to the above-described embodiment, and for example, the shape, position, number and the like of the projections 3 are arbitrary. In the above-described embodiment, the projections 3 are provided only on one main surface of the varistor element body 1. However, the projections 3 may be provided on both main surfaces.

[0010]

As described above, according to the present invention, it is possible to provide a ring-type varistor in which electrodes can be printed and printed at accurate positions without inserting a spacer between varistor bodies. This simplifies the varistor manufacturing process and increases the yield, so that the effect of improving varistor productivity can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a ring-shaped varistor element body showing respective embodiments of the present invention.

FIG. 2 is a side view showing an example of a process of printing an electrode on a ring-shaped varistor element according to an embodiment of the present invention.

FIG. 3 is a perspective view showing a state in which an electrode is formed on a ring-shaped varistor body according to an embodiment of the present invention to form a varistor.

FIG. 4 is a side view showing an example of a step of printing an electrode on a ring-shaped varistor element according to a conventional example.

FIG. 5 is a perspective view showing a state in which an electrode is formed on a ring-type varistor element body according to the conventional example to form a varistor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ring-shaped varistor element body 2 Hole of varistor element body 3 Projection 4 Electrode

Claims (4)

(57) [Scope of request for utility model registration] The method according to claim 1] to form an electrode on an outer peripheral surface, the ring-shaped varistor element for forming the ring-shaped varistor, on at least one major surface of the varistor element, the
A ring-shaped varistor element, wherein a projection locally protruding from a main surface is formed. 2. The ring-shaped varistor element according to claim 1, wherein the number of projections protruding from the main surface of the ring-shaped varistor element is three or more. 3. The ring-shaped varistor element according to claim 2, wherein the protrusions are arranged symmetrically with respect to the center of the ring-shaped varistor element. 4. The ring-shaped varistor element according to claim 1, wherein the projection is arranged at an intermediate position between the outer circumference and the inner circumference of the ring-shaped varistor element. .