JPH0436108Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a solid electrolytic capacitor with a fuse, and particularly to the structure of a fuse connection.

[Conventional technology]

Generally, solid electrolytic capacitors are used in various electronic circuits, and although their failure rate is low, if a solid electrolytic capacitor fails in a circuit, it will often result in a short circuit, and if a large short circuit current flows, the capacitor element will be damaged. It may generate heat and burn out. When a short-circuit failure occurs in a capacitor, it is generally known to use a fuse as a mechanism for opening the short circuit in order to protect other circuit components.

As a conventional technique, for example, as shown in Japanese Patent Publication No. 58-21816 shown in FIG. 4, a metal plate 10 and a fuse 3 are connected between a cathode layer 5a on the outer periphery of a capacitor element 5 and a cathode external terminal 4b. A solid electrolytic capacitor with a fuse mechanism built into the exterior resin 1, and the Japanese Patent Publication No. 58-19148 shown in Figure 5
As in the publication, the cathode layer 5a on the outer periphery of the capacitor element
There is a solid electrolytic capacitor in which a fuse 3 is connected between the external cathode terminal 4b and the exterior resin 1.

[Problem that the invention attempts to solve]

In the above-described conventional solid electrolytic capacitors with fuses, as shown in FIG. 4 of the first example and FIG. 5 of the second example, the fuse was built into the exterior resin.

Therefore, if a solid electrolytic capacitor breaks down after it has been mounted on a printed wiring board, etc., and the fuse built into the solid electrolytic capacitor blows out, the problem will occur because a large number of solid electrolytic capacitors are generally mounted on a printed wiring board. The drawback is that it is not possible to determine at a glance which solid electrolytic capacitor has failed.

Furthermore, since the structure is such that the fuse is covered with resin after the fuse is connected, there is a drawback that the fuse connection part may be disconnected due to the stress of assembly at the time of sheathing, stress due to curing of the sheathing resin, etc.

The purpose of this invention is to make it possible to visually confirm the reliability of the connection between a fuse and a fuse connection terminal, and to prevent defects in the event that the capacitor fails and the fuse breaks after being mounted on a printed wiring board, etc. An object of the present invention is to provide a solid electrolytic capacitor with a fuse, which allows easy identification of the capacitor and greatly reduces the time required to replace parts.

[Means for solving problems]

The solid electrolytic capacitor with a fuse of the present invention has the fuse connection terminal connected to one electrode of the capacitor element and the fuse connection terminal connected to one of the external anode lead or the external cathode lead exposed outside the exterior resin. A fuse is connected between these two terminals.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1a and 1b are a perspective view and a plan view showing the internal structure of the first embodiment of the present invention.

In FIGS. 1a and 1b, 1 is an exterior resin of a solid electrolytic capacitor, 2a and 2b are two fuse connection terminals exposed outside the exterior resin 1, and 3
are fuses connected to the two fuse connection terminals 2 by bonding or the like, and 4a and 4b are external anode lead wires and external cathode lead wires drawn out of the exterior resin 1, respectively.

Further, 5 is a capacitor element, and 6 is an anode lead wire drawn out from the capacitor element 5, and is electrically connected to the external anode lead wire 4a. Further, 5a is a cathode layer on the outer periphery of the capacitor element 5, and 7 is a cathode lead-out terminal connected to the cathode layer 5a of the capacitor element 5 with a conductive paste, a part of which is exposed outside the external resin 1, and a fuse connection terminal. 2a is formed. Further, the external cathode lead wire 4b is exposed to the outside of the resin sheath 1 on the same surface as the fuse connection terminal 2a.
b, and these two fuse connection terminals 2
Fuse 3 is connected to a and 2b.

FIG. 2 is a perspective view of a second embodiment of the present invention.

In FIG. 2, 8 is a notch provided in a part of the resin exterior 1. Fuse connection terminals 2a, 2b are provided in this notch 8, and the fuse 3 is connected to the fuse connection terminals 2a, 2b. It is connected. This embodiment has the advantage that since the fuse 3 is located in the notch 8, the fuse will not easily break during handling.

Note that the internal structure diagram of the second embodiment shown in FIG. 2 is omitted because it is similar to the first embodiment shown in FIGS. 1a and 1b.

3a and 3b are a perspective view and a plan view showing the internal structure of a third embodiment of the present invention.

The third embodiment is a chip-type solid electrolytic capacitor, whereas the first and second embodiments are self-supporting solid electrolytic capacitors. Figure 3 a, b
, 9a and 9b are an external anode terminal and an external cathode terminal, which are the same as the external anode lead 4a and the external anode lead 4b in the first and second embodiments, but their shape is not a rod shape but a flat plate. This is the state of affairs. The internal structure and the like are the same as those in the first and second embodiments, so a description thereof will be omitted. Note that since this embodiment is of a chip type, there is an advantage unique to chip capacitors in that high-density mounting by surface mounting is possible.

[Effect of idea]

As explained above, the present invention provides two fuse connection terminals exposed outside the exterior resin, and connects the fuse to these two fuse connection terminals to ensure reliable connection between the fuse and the fuse connection terminal. It is possible to visually confirm the gender, and
If a capacitor fails and a fuse breaks after being mounted on a printed wiring board or the like, the defective capacitor can be easily identified, which has the effect of greatly reducing the time required to replace parts.

[Brief explanation of the drawing]

Figures 1a and b are a perspective view and a plan view showing the internal structure of the first embodiment of the invention, Figure 2 is a perspective view of the second embodiment of the invention, and Figures 3a and b are FIG. 4 is a perspective view and a plan view showing the internal structure of the third embodiment of the present invention; FIG. 4 is a sectional view showing the internal structure of an example of a conventional solid electrolytic capacitor with a fuse;
The figure is a transparent perspective view showing the internal structure of another example of a conventional solid electrolytic capacitor with a fuse. 1... Exterior resin, 2a, 2b... Fuse connection terminal, 3... Fuse, 4a... External anode lead wire, 4b... External cathode lead wire, 5... Capacitor element, 5a... Cathode layer, 6 ...Anode lead wire, 7...Cathode draw terminal, 8...Notch, 9a...External anode terminal, 9b...External cathode terminal, 10...Metal plate.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a solid electrolytic capacitor with a fuse that is coated with resin, a fuse connection terminal connected to one electrode of the capacitor element and one of the external anode lead or the external cathode lead A solid electrolytic capacitor with a fuse, characterized in that each of the fuse connection terminals is exposed outside the exterior resin, and a fuse is connected between the two terminals. (2) The fuse-equipped device according to claim (1) of the utility model registration claim, characterized in that two fuse connection terminals exposed outside the exterior resin are provided in a notch in the exterior resin. Solid electrolytic capacitor.