JPH069475Y2 - Cap terminals for electronic components - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a cap terminal of an electronic component fitted to an end of a tubular electronic component.

(Prior Art) Conventionally, there is known a cylindrical ceramic capacitor in which a cap terminal made of metal is attached to a cylindrical electronic component, for example, a cylindrical dielectric ceramic body, and the cap terminal serves as an electrode. As shown in FIG. 2a, this cylindrical porcelain capacitor has a cylindrical dielectric porcelain element body (hereinafter referred to as an element body) 1 and a part of the outer peripheral surface from one end to the inner peripheral surface thereof. And the external electrodes 3 formed on the outer peripheral surface of the element body 1 at a predetermined distance from the end portions 2a of the inner electrode 2 and the metal electrodes attached to both ends of the element body 1. It is composed of a cap terminal 4.

The shape of the cap terminal 4 is, as shown in FIG. 2b, a circular bottom portion 41 and a cylindrical portion 4 provided upright on the periphery of the bottom portion 41.
2, which is a tubular metal cap having an open end. In addition, a plurality of protrusions are formed on the inner peripheral surface of the tubular portion 42,
A device in which the electrical connection with the element body 1 is ensured is also generally known.

Each cap terminal 4, the internal electrode 2, and the partial electrode 3 are electrically connected by a solder 5. Further, an insulating resin 6 is applied on the outer peripheral surface of the element body 1 to insulate the internal electrodes 2 from the external electrodes 3, and the resin 6 is covered with an unillustrated coating material. .

In the cylindrical porcelain capacitor described above, as one means for increasing the capacitance without increasing the size of the shape,
A method of enlarging the facing area between the internal electrode 2 and the external electrode 3 is adopted.

(Problems to be Solved by the Invention) As described above, as a method of enlarging the facing area between the internal electrode 2 and the external electrode 3, the area of the internal electrode 2 led out to the outer peripheral surface of the element body 1 is reduced and It is conceivable to increase the area of the external electrode 3.

However, in this case, the edge 2a of the internal electrode 2 located on the outer peripheral surface of the element body 1 is hidden inside the tubular portion 42 of the cap terminal 4, and the edge 2a of the internal electrode 2 and the external electrode 3 are hidden.
The resin 6 cannot be coated between the edge 3a and the edge 3a.
That is, when the resin 6 is applied, the resin 6 seals the edge of the tubular portion 42 of the cap terminal 4, air is enclosed in the cap terminal 4, and the resin 6 permeates into the inner depth of the cap terminal 4. Inhibit. Therefore, there is a possibility that the breakdown voltage between the internal electrode 2 and the external electrode 3 may be reduced, and there is a limit to increase the capacitance by the method described above.

In view of the above problems, an object of the present invention is to provide a cap terminal for an electronic component that allows a resin or the like to easily penetrate between the tubular electronic component and the tubular electronic component when the end terminal of the tubular electronic component is fitted. To do.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a first electrode having a predetermined width formed on an outer peripheral surface of an end portion of a tubular electronic component element in claim (1). A metal cap terminal fitted to an end portion of an electronic component body having the first electrode and a second electrode formed at a predetermined distance on the outer peripheral surface, the bottom portion including: And a tubular portion that is erected on the periphery of the bottom and has a length that extends over at least the first and second electrodes, and the tubular portion is in the vicinity of the gap between the first electrode and the second electrode. We propose a cap terminal for electronic parts in which a plurality of through holes are formed.

In addition, claim (2) proposes a cap terminal for an electronic component according to claim (1), in which a peripheral surface is plated with solder.

(Operation) According to claim (1) of the present invention, the cap terminal is fitted to the end portion of the tubular electronic component body, and the insulating resin is provided on the end portion of the tubular portion of the cap terminal and the surface of the body. When applying, the air in the cap terminal is exhausted to the outside through the through hole formed in the tubular portion. Therefore, the resin is permeated between the surface of the element body and the inner surface of the tubular portion.

Further, according to claim (2), by heating the cap terminal, the solder plating applied to the peripheral surface thereof is melted,
Electrical connection with the electrodes is made.

(Embodiment) FIG. 1a is an external view showing a first embodiment of the present invention, and FIG.
FIG. 1 is a sectional view showing a cylindrical ceramic capacitor in the first embodiment. In the figure, the same components as those of the conventional example are designated by the same reference numerals, and the description thereof will be omitted.

In addition, the difference between the above-described conventional example and the first embodiment is that a plurality of circular through holes 42b are formed in the tubular portion 42 of the cap terminal 4.
It is formed at equal intervals along the edge. Furthermore, solder plating (not shown) is applied to the peripheral surfaces of the bottom portion 41 and the tubular portion 42 of the cap terminal 4.

According to the first embodiment having the above-described structure, when the cap terminals 4 are fitted to both ends of the element body 1 and then the cap terminals 4 are heated to a predetermined temperature, the solder plating melts,
The cap terminal 4 is connected to the internal electrode 2 or the external electrode 3. Further, in this state, the tubular portion 4 of the cap terminal 4 is
Insulating resin 6 is applied to the edge of 2 and the external electrode 3 on the surface of element body 1.
When is applied, the air in the cap terminal 4 is exhausted to the outside through the plurality of through holes 42a. This makes resin 6
Penetrates between the cap terminal 4 and the element body 1, and the through hole 4
It reaches the position of 2a.

Therefore, by forming the through hole 42b of the cap terminal 4 closer to the internal electrode 2 side than the edge 2a of the internal electrode 2 led out on the outer peripheral surface of the element body 1, the edge 2a of the internal electrode 2 and the outside The resin 6 can be applied between the electrode 3 and the edge 3 a.

As a result, the area of the internal electrode 2 led out to the outer peripheral surface of the element body 1 can be reduced and the area of the external electrode 3 can be increased, and the capacitance can be increased without increasing the size. You can

Next, a second embodiment of the present invention will be described.

FIG. 3 is an external view showing the second embodiment. In the figure, the same components as those of the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted. Further, the difference between the first embodiment and the second embodiment is that a plurality of through holes 42a and 42b are formed in the circumferential direction in the edge portion of the tubular portion 42. For example, a plurality of through holes 42 a arranged at equal intervals in the circumferential direction and arranged in the circumferential direction at the end of the tubular portion 42, and the through holes 4
A plurality of through holes 42b that are similarly arranged in the circumferential direction are formed slightly closer to the bottom 41 than 2a.

According to the second embodiment having the above-described configuration, when the resin 6 is applied to the end edge of the tubular portion 42 of the cap terminal 4 and the external electrode 3 on the surface of the element body 1, a plurality of air in the cap terminal 4 is generated. The gas is exhausted to the outside through the through holes 42a and 42b. As a result, the resin 6 easily permeates between the cap terminal 4 and the element body 1, so that the permeation distance of the resin 6 is increased and the tubular portion 4
The resin 6 can be penetrated deep into the inner part of the inner wall 2. Therefore,
It is possible to increase the capacitance without lowering the breakdown voltage between the internal electrode 2 and the external electrode 3.

A plurality of rows of through holes may be formed according to the penetration distance of the resin.

Next, a third embodiment of the present invention will be described.

FIG. 4 is an external view showing the third embodiment. In the figure, the same components as those of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. In addition, the first embodiment and the third
The difference from the above embodiment is that a plurality of protrusions 42c are formed on the inner peripheral surface of the tubular portion 42 of the cap terminal 4. That is, the protrusions 42c extend in the axial direction so as to be located between the through hole 42a and the bottom portion 41, and are juxtaposed in the circumferential direction at equal intervals. Therefore, the cap terminal 4 is attached to the end of the body 1.
The protrusion 42c is pressed against the internal electrode 2 or the external electrode 3 when mounting. Thereby, the electrical connection between the cap terminal 4 and the internal electrode 2 or the external electrode 3 is made more reliable.

Further, by providing the plurality of protrusions 42c, the protrusions 42c serve as spacers, and the resin 6 can more easily permeate between the tubular portion 42 and the element body 1.

(Effect of the Invention) As described above, according to claim (1) of the present invention, the resin is applied to the end of the tubular portion of the cap terminal, and the resin is applied between the inner surface of the tubular portion and the surface of the element body. It becomes possible to penetrate. Therefore, like the cylindrical porcelain capacitor, the first electrode and the second electrode
Even if the gap between the electrode and the electrode is located inside the tubular portion, the resin can be applied to the gap, so that the breakdown voltage is not lowered and the capacitance is increased without increasing the size. It has an extremely excellent effect of being able to achieve

Further, according to claim (2), in addition to the above effects, the first
Alternatively, the work of electrically connecting the second electrode and the cap terminal can be simplified.

[Brief description of drawings]

FIG. 1a is an external view showing a first embodiment of the present invention, 1b
FIG. 2 is a sectional view showing a cylindrical ceramic capacitor according to the first embodiment, FIG. 2a is a sectional view showing an example of a conventional cylindrical ceramic capacitor, and FIG. 2b is an external view showing a cap terminal of the conventional example. The figure is an external view showing a second embodiment of the present invention,
FIG. 4 is an external view showing a third embodiment of the present invention. 1 ... Element, 2 ... Internal electrode, 3 ... External electrode, 4 ...
Cap terminal, 41 ... bottom part, 42 ... cylindrical part, 42
a, 42b ... through hole, 42c ... protrusion.

Claims (2)

[Scope of utility model registration request] 1. A first electrode having a predetermined width formed on an outer peripheral surface of an end portion of a tubular electronic component element, and a second electrode formed on the outer peripheral surface at a predetermined distance from the first electrode. A metal cap terminal fitted to an end of an electronic component body having a bottom, and a tube having a length extending over at least the first and second electrodes and standing on a peripheral edge of the bottom. A cap terminal for an electronic component, wherein the tubular portion has a plurality of through holes formed in the vicinity of the gap between the first electrode and the second electrode. 2. The cap terminal for an electronic component according to claim 1, wherein the peripheral surface is plated with solder.