JP2562589Y2 - Chip type solid electrolytic capacitor with fuse - 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 solid electrolytic capacitor with a fuse, and more particularly to a structure in which a fuse is built in a chip solid electrolytic capacitor.

[0002]

2. Description of the Related Art In general, solid electrolytic capacitors are used in various electronic circuits, and in particular, chip solid electrolytic capacitors have been widely used in recent years. Conventionally, this type of capacitor has a low failure rate, but in the event of a failure, the failure mode is often short-circuit failure, and when a large short-circuit current flows, the capacitor element generates heat and may burn out. When a fault occurs due to this excessive short-circuit current, it is necessary to release the fault mode from a short-circuit in order to protect circuit components, and means using a fuse is generally known. As a prior art, for example, there is a chip-shaped solid electrolytic capacitor having a built-in fuse, as shown in FIG.

[0003]

As shown in FIG. 5, the above-mentioned conventional chip-shaped solid electrolytic capacitor with a fuse connects the cathode layer 1a of the capacitor element 1 and the fuse 5 by welding or the like. 1a has the following disadvantages due to the occurrence of irregularities on the surface. (1) The connection between the cathode layer 1a and the fuse 5 is not reliable. (2) It is difficult to control the length of the fuse 5 acting as a resistor.

An object of the present invention is to eliminate the conventional disadvantages, improve the reliability of fuse connection, control the length of the fuse acting as a resistor easily, reduce the variation, and easily manufacture the conventional fuse. An object of the present invention is to provide a chip-shaped solid electrolytic capacitor with a fuse that can be used almost as it is in a manufacturing process apparatus.

[0005]

According to the present invention, there is provided a chip-shaped solid electrolytic capacitor having a fuse, comprising: an anode connected to an anode lead led out from a capacitor element in a chip-shaped solid electrolytic capacitor having an anode external terminal and a cathode external terminal. An external terminal, a cathode internal terminal for connecting to the cathode layer of the capacitor element, and a cathode exterior having an insulator adhered to a surface in contact with a conductive adhesive connected to the cathode internal terminal via an insulating intervening substance. A terminal, a conductive adhesive for connecting the cathode layer of the capacitor element to the cathode internal terminal, the insulating insert and the cathode external terminal, a fuse bridging the cathode internal terminal and the cathode external terminal, and an anode external terminal. And an exterior resin for covering all but a part of the cathode external terminal.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a sectional view of an embodiment of a chip-shaped solid electrolytic capacitor with a fuse according to the present invention.

[0007] An anode external terminal 3 formed in a U-shape is connected to an anode lead 2 implanted on the capacitor element 1. On the other hand, the cathode layer 1a on the surface portion of the capacitor element 1 and the cathode terminal 4 on which the fuse 5 is formed are connected via a conductive adhesive 6, and the whole except for a part of the cathode and cathode external terminals 3, 4a Is insulated by an exterior resin 9 using a transfer mold or the like to form a chip-shaped solid electrolytic capacitor with a fuse.

Next, the cathode terminal 4 having the fuse 5 shown in FIG. 2 will be described. In the press-molded cathode terminal 4 shown in FIG. 3, an insulator 8 such as a silicone resin is applied to the cathode external terminal 4 a on the surface in contact with the conductive adhesive 6. Next, after inserting an insulating insert 7 such as glass epoxy between the cathode internal terminal 4b and the cathode external terminal 4a, the cathode terminal cutting portion 4c connecting the cathode internal terminal 4b and the cathode external terminal 4a is cut off by a cutting machine. After that, a fuse 5 having a length of 2 mm is welded to the cathode external terminal 4a and the cathode internal terminal 4b to form a bridge.

FIG. 4 is a sectional view of another embodiment of the present invention. In the first embodiment, the fuse 5 and the insulating insert 7 are arranged on the bottom of the chip-shaped solid electrolytic capacitor with a fuse. In this embodiment, the fuse 5 and the insulating insert 7 are arranged.
Was disposed on the side surface of the chip-shaped solid electrolytic capacitor with a fuse on the side of the cathode external terminal 4a. In this embodiment, the structure of the cathode internal terminal 4b on the bottom side of the capacitor element 1 is the same as that of the chip solid electrolytic capacitor without a fuse. There is an advantage that the volume of the chip-shaped solid electrolytic capacitor can be more effectively utilized than in the first embodiment because it can be the same as the electrolytic capacitor.

[0010]

[Effects of the Invention] As described above, the present invention uses the fuse 5
The following effects can be obtained by adopting the cathode terminal 4 having the above-mentioned structure for a chip-shaped solid electrolytic capacitor. (1) Except for manufacturing the cathode terminal 4 on which the fuse 5 is formed, a manufacturing apparatus for a chip-shaped solid electrolytic capacitor without a fuse can be used as it is. (2) Since the length of the fuse 5 acting as a resistor is easier to control than in the past, the variation is reduced, and if necessary, the electrical characteristics of the fuse 5 for each chip-shaped solid electrolytic capacitor during the manufacturing process. Inspection is facilitated and variation in fuse blowing characteristics is improved. (3) Since both ends of the fuse 5 are connected to the cathode terminal 4, the reliability of connection of the fuse 5 is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a perspective view of a cathode terminal on which a fuse used in one embodiment of the present invention is formed.

FIG. 3 is a front view of an anode terminal and a cathode terminal used in the embodiment of the invention;

FIG. 4 is a sectional view of another embodiment of the present invention.

FIG. 5 is a cross-sectional view of an example of a conventional chip-shaped solid electrolytic capacitor with a fuse.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Capacitor element 1a Cathode layer 2 Anode lead 3 Anode external terminal 4 Cathode terminal 4a Cathode external terminal 4b Cathode internal terminal 4c Cathode terminal cutting part 5 Fuse 6 Conductive adhesive 7 Insulating insert 8 Insulator 9 Exterior resin 10 Insulation adhesive

Claims (1)

(57) [Scope of request for utility model registration] 1. A chip solid electrolytic capacitor having an anode external terminal and a cathode external terminal, wherein an anode external terminal connected to an anode lead derived from the capacitor element and an internal cathode for connecting to a cathode layer of the capacitor element. A terminal, a cathode external terminal having an insulator adhered to a surface in contact with a conductive adhesive connected to the cathode internal terminal via an insulating insert, a cathode layer and a cathode internal terminal of the capacitor element, A conductive adhesive for connecting the insert and the cathode external terminal, a fuse bridging the cathode internal terminal and the cathode external terminal, and an exterior resin covering all but a part of the anode external terminal and the cathode external terminal; And a chip-shaped solid electrolytic capacitor with a fuse.