JP2006196817A - Varistor component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a varistor component whose deterioration in varistor characteristic is suppressed by making part of a conductive adhesive bonding a varistor element and a lead terminal together not flow out as an excessive conductive adhesive along the lead terminal. <P>SOLUTION: The varistor component has the flat columnar varistor element 22, a 1st lead terminal 30 which is bonded to the varistor element 22 with the conductive adhesive 28, a 2nd lead terminal bonded to the varistor element 22, and a substantially square exterior component 34 which is mounded out of insulating resin to cover the varistor element 22. The 1st lead terminal 30 and the 2nd lead terminal are provided with a through-hole 36 opposite to a nearly center of the varistor element 22, and a through-hole 36 opposite to the outer part of the varistor element 22. Part of the conductive adhesive 28 is projected from those through holes 36. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a varistor component used as a countermeasure against surge in various electronic devices.

  Hereinafter, conventional varistor components will be described with reference to the drawings.

  FIG. 4 is a partially transparent perspective view of a conventional varistor part, and FIG. 5 is a cross-sectional view of the varistor part before the exterior portion is formed.

  4 and 5, the conventional varistor component includes a flat cylindrical varistor element 2, an upper surface electrode 4 formed on the upper surface of the varistor element 2, a lower surface electrode 6 formed on the lower surface, and a conductive adhesive 8. The first lead terminal 10 bonded to the upper surface electrode 4 of the varistor element 2 through the first electrode, the second lead terminal 12 bonded to the lower surface electrode 6 of the varistor element 2, and the insulating resin so as to cover the varistor element 2 The exterior part 14 was provided.

  The first lead terminal 10 and the second lead terminal 12 are bonded at the center of the varistor element 2, pulled out of the varistor element 2, and protruded from the exterior part 14.

  The first lead terminal 10 and the second lead terminal 12 protruding from the exterior portion 14 are bent along the exterior portion 14 to form a varistor component.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
Japanese Utility Model Publication No. 63-152201

  In the above configuration, the varistor element 2 is bonded to the first lead terminal 10 and the second lead terminal 12 via the conductive adhesive 8, but when the amount of the conductive adhesive 8 applied is large, There may be a case where excess conductive adhesive 8 flows to the first lead terminal 10 and the second lead terminal 12 bent to the side surface. At this time, the distance (L) between the excess conductive adhesive 8 that has flowed out and the first lead terminal 10 or the second lead terminal 12 is a predetermined distance (W) between the first lead terminal 10 and the second lead terminal 12. The predetermined varistor characteristics cannot be obtained.

  The present invention solves the above-described problems, and prevents a part of the conductive adhesive that bonds the varistor element and the lead terminal from flowing along the lead terminal as an excess conductive adhesive. An object of the present invention is to provide a varistor component that suppresses deterioration of characteristics.

  In order to achieve the above object, the present invention particularly includes a varistor element and a lead terminal bonded to the varistor element via a conductive adhesive, and the lead terminal is located at a position facing the varistor element. In addition to providing a through hole, a part of the conductive adhesive protrudes from the through hole.

  With the above configuration, the lead terminal is provided with a through hole at a position facing the varistor element, and part of the conductive adhesive protrudes from the through hole, so that part of the conductive adhesive is excessive. Even if the conductive adhesive is formed, the excess conductive adhesive protrudes from the through hole and does not flow along the lead terminal. Therefore, deterioration of the varistor characteristics can be suppressed.

  Hereinafter, the invention described in all claims of the present invention will be described using embodiments with reference to the drawings.

  FIG. 1 is a partially transparent perspective view of a varistor part according to an embodiment of the present invention, FIG. 2 is a plan view of the varistor part before forming the exterior part, and FIG. 3 is a cross-sectional view of the varistor part before forming the exterior part. is there.

  1 to 3, a varistor component according to an embodiment of the present invention includes a flat cylindrical varistor element 22, an upper surface electrode 24 formed on the upper surface of the varistor element 22, and a lower surface electrode 26 formed on the lower surface. A first lead terminal 30 bonded to the upper surface electrode 24 of the varistor element 22 via a conductive adhesive 28, a second lead terminal 32 bonded to the lower surface electrode 26 of the varistor element 22, and the varistor element 22 are covered. And a substantially rectangular exterior part 34 molded with an insulating resin.

  The first lead terminal 30 and the second lead terminal 32 are provided with a through hole 36 at a position facing the central vicinity of the varistor element 22, and the through hole 36 is formed at a position facing the outer peripheral portion of the varistor element 22. The conductive adhesive 28 is partially protruded from the through holes 36. The first lead terminal 30 and the second lead terminal 32 are pulled out to the outside of the varistor element 22, bent along the outer shape of the varistor element 22, further protruded from the exterior part 34 and along the exterior part 34. The varistor part is formed by bending.

  With the above configuration, the first lead terminal 30 and the second lead terminal 32 are provided with a through hole 36 at a position facing the varistor element 22, and a part of the conductive adhesive 28 protrudes from the through hole 36. Therefore, even if a part of the conductive adhesive 28 becomes an excessive conductive adhesive 28, the excessive conductive adhesive 28 does not flow along the first lead terminal 30 or the second lead terminal 32. Therefore, the distance between the excess conductive adhesive 28 and the first lead terminal 30 or the second lead terminal 32 is not shorter than the predetermined distance between the first lead terminal 30 and the second lead terminal 32, and varistor characteristics are improved. Deterioration can be suppressed.

  In particular, according to the distance from the tip of the first lead terminal 30 and the second lead terminal 32 to the through hole 36, the first lead terminal is provided by the through hole 36 provided at a position facing the outer peripheral portion of the varistor element 22. Since the adhesive force between the varistor element 22 and the second lead terminal 32 can be suppressed, the through hole 36 can be positioned in consideration of the adhesive force.

  Furthermore, since the conductive adhesive 28 protruding from the through hole 36 serves as a wedge and produces an anchor effect, the adhesive force can be improved.

  As described above, the varistor component according to the present invention has a varistor characteristic in which a part of the conductive adhesive that bonds the varistor element and the lead terminal does not flow out along the lead terminal as an excess conductive adhesive. Can be used in various electronic devices.

1 is a partially transparent perspective view of a varistor component according to an embodiment of the present invention. Plan view of the varistor part before forming the exterior Sectional view of the varistor part before forming the exterior Partial perspective view of a conventional varistor part Sectional view of the varistor part before forming the exterior

Explanation of symbols

22 varistor element 24 upper surface electrode 26 lower surface electrode 28 conductive adhesive 30 first lead terminal 32 second lead terminal 34 exterior portion 36 through hole

Claims (2)

A varistor element and a lead terminal bonded to the varistor element via a conductive adhesive; the lead terminal is provided with a through hole at a position facing the varistor element; Varistor parts with part of the adhesive protruding. The varistor component according to claim 1, wherein the through hole is provided at a position facing the outer side of the varistor element.

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