JPH05217812A - Chip-shaped solid electrolytic capacitor with built-in fuse - Google Patents

Abstract

PURPOSE:To provide a chip-shaped solid electrolytic capacitor, with a built-in fuse, wherein it can check the fuse, its polarity can be distinguished from the shape of a terminal and its reverse mounting operation can be prevented. CONSTITUTION:A cathode layer is formed on the peripheral face of a capacitor element 1 in which an anode lead is implanted and erected and which has been pressurized and molded; a first outer lead terminal 3 is extracted from the anode lead. A second outer lead terminal 4 and a third outer lead terminal 5 which have been welded to the end part of a fuse wire connected to the cathode layer by using a conductive adhesive 10 are extracted from the cathode layer at a face which is different from the first outer lead terminal 3. The title capacitor is constituted after this assembly has been outer-packaged by sung a resin as a three-terminal shape. Consequently, whether the fuse has been blown or not can be checked easily by using the second and third outer lead terminals 4, 5, the polarity of the title capacitor can be distinguished easily, and it is possible to prevent that the capacitor its mounted reversely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip-type solid electrolytic capacitor with a built-in fuse, and in particular, the polarity of the capacitor is indicated by a terminal shape and the like, and a fuse check can be performed by using two terminals for connecting a fuse wire. It is related to the structure.

[0002]

2. Description of the Related Art Conventionally, in this type of chip type solid electrolytic capacitor with a built-in fuse, a cathode layer is provided on the peripheral surface of a capacitor element 1 formed by embedding an anode lead and press-molding as shown in FIG. Anode lead terminal 6 from the anode lead,
The cathode lead terminals 7 to which the fuse wires 9 are previously welded are drawn out in different directions from the fuse wires 9 connected to the cathode layer using a conductive adhesive 10 or the like, and a part of the positive / cathode lead terminals 6/7 is removed. Except for this, the resin was molded with the exterior resin 2.

[0003]

The above-described conventional chip-type solid electrolytic capacitor with a built-in fuse is polar and has a similar appearance on the anode side and the cathode side. Therefore, it is shown in FIG. 3 (a). As described above, there is a drawback in that the polarity must be discriminated in appearance by imprinting the polarity display 8 on the upper surface of the exterior resin material. Also, since the shapes are the same, there is a drawback that reverse mounting is likely to occur. Further, in the conventional chip-type solid electrolytic capacitor with a built-in fuse, since the fuse wire 9 is resin-molded, it is difficult to check the fuse wire 9 from the outside when the fuse is melted.

The object of the present invention is to distinguish the polarity from the structure, which can be distinguished only from the conventional marking on the upper surface of the resin material.
Built-in fuse that can prevent reverse mounting in advance and that can be electrically checked from the outside by the second and third external lead terminals 4 and 5 that connect the fuse wire when the fuse is blown It is to provide a chip type solid electrolytic capacitor.

[0005]

A chip-type solid electrolytic capacitor with a built-in fuse according to the present invention is a solid electrolytic capacitor element in which an anode lead is erected and pressure-molded, and a cathode layer is provided on a peripheral surface thereof. The first external lead terminal is led out from the fuse wire connected to the cathode layer using a conductive adhesive or the like, and the fuse wire is previously welded to the second wire.
The third external lead terminal is led out and coated with resin, and the second and third external lead terminals are led out at symmetrical positions on one surface, and the first external lead terminal is the second and third external lead terminals. The external lead terminal is derived from a surface different from that of the external lead terminal.

[0006]

The present invention will be described below with reference to the drawings. FIG. 1 is a front view, a back view, and a sectional view taken along the line AB, a sectional view taken along the line CD, and a sectional view taken along the line EF of FIG. 2 is an assembly drawing of a fuse wire according to an embodiment of the present invention, which is an assembly drawing of a fuse wire, a lead frame, a fuse wire, a fuse wire, and a capacitor element.

In FIG. 1, the capacitor element 1 is obtained by press-molding a similar metal powder around a metal wire having a valve action into a prismatic shape and vacuum-sintering the metal wire with an oxide layer, a semiconductor layer and a graphite layer interposed therebetween. An electrode lead-out layer is formed.

Next, as shown in FIG. 2, a fuse wire 9 is stretched and welded to the second and third external lead terminals 4 and 5 on the cathode side of the lead frame 11 pressed into a frame shape,
By using the lead frame 11 (FIG. 2D) formed by cutting the fuse wire 9 along the lead terminal, the first external lead terminal 3 is provided in a different direction from the capacitor element 1 such as an anode lead. Are welded, and for example, the fuse wire 9 is connected to the cathode layer side using a conductive adhesive such as silver paste or solder 10.

Next, at both ends of the fuse wire 9, the second and third external lead terminals 4 and 5 arranged at positions different from the lead-out direction of the first external lead terminal 3 are welded and connected as described above. Has been done.

Next, after these terminals are connected, resin molding is carried out, and terminals are bent and formed so as to fit the external dimensions, and as shown in FIGS. The terminals are formed to form a chip-type solid electrolytic capacitor with a built-in fuse.

[0011]

As described above, according to the present invention, in the chip type solid electrolytic capacitor with a built-in fuse, the first external lead terminal derived from the anode lead of the capacitor element is
Since it is placed at a position different from the lead-out direction of the second and third external lead terminals led out from the fuse wire connected to the cathode layer, the polarity, which could be distinguished only by the marking on the top surface of the resin material, can be distinguished from the structure. There is an effect that can be done. Further, similarly, there is an effect of preventing reverse mounting.

Further, according to the present invention, when the fuse wire is blown due to a short circuit of the capacitor element, the fuse wire can be electrically checked from the outside by using the second and third external lead terminals for connecting the fuse wire. There is an effect that can be done.

[Brief description of drawings]

FIG. 1 is a front view and a back view of a chip-type solid electrolytic capacitor with a built-in fuse according to an embodiment of the present invention, and FIG.
It is the AB sectional view, CD sectional view, and EF sectional view of (a).

FIG. 2 is a fuse wire assembly diagram of an embodiment of the present invention,
FIG. 3 is an assembly diagram after the fuse wire, the lead frame, and the fuse wire are stretched, the fuse wire is cut, and the capacitor element is assembled.

FIG. 3 is a front view, a back view, a cross-sectional view taken along the line AB, and a line C- of an example of a conventional chip-type solid electrolytic capacitor with a built-in fuse.
It is a D line sectional view.

[Explanation of symbols]

 1 Capacitor Element 2 Exterior Resin 3 First External Lead Terminal 4 Second External Lead Terminal 5 Third External Lead Terminal 6 Anode Lead Terminal 7 Cathode Lead Terminal 8 Polarity Display 9 Fuse Wire 10 Conductive Adhesive 11 Lead Frame

Claims (1)

[Claims] 1. In a solid electrolytic capacitor element in which an anode lead is erected and pressure-molded, and a cathode layer is provided on the peripheral surface, a first external lead terminal is led out from the anode lead and The second and third external lead terminals, which are welded to the ends of the fuse wire connected to the cathode layer using a conductive adhesive or the like, are led out and covered with a resin, and the second and third external leads are formed. The chip-type solid electrolytic capacitor with a built-in fuse, wherein the terminals are led out at symmetrical positions on one surface, and the first external lead terminals are led out on a surface different from the second and third external lead terminals.