JPS607472Y2 - solid electrolytic capacitor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a solid electrolytic capacitor having lead wires drawn out in the same direction and having a synthetic resin coating.

Conventionally, a co-lead type resin-coated solid electrolytic capacitor using lead wires punched out of a thin metal plate is constructed as shown in FIG.

That is, an anode lead wire 2 is drawn out from a capacitor element 1 in which a valve metal is formed as an anode body L, an anodic oxide film, a semiconductor layer such as manganese dioxide, and a cathode layer are formed thereon, and the anode lead wire 2 can be soldered to the anode lead wire 2. A welding part 5 protruding perpendicularly to the anode lead wire 2 is connected to a part of the widening part 4 of the anode lead 3 formed by punching out a metal plate, and a metal plate is similarly attached to the outer peripheral surface of the capacitor element 1. The elongated portions 7 of the cathode leads 6 formed by punching out a plate are connected with solder 8, and a synthetic resin coating 9 is applied to form a solid electrolytic capacitor.

According to this configuration, the connection between the anode lead wire 2 and the anode part 3 can be efficiently performed using the welding part 5, and the resin coating 9 can be formed in a uniform manner, improving the product value. As the capacitor element 1 becomes smaller, the wide parts of the anode lead 3 and the cathode lead 6 become closer to each other, resulting in poor electrical insulation, making it difficult to use them in very small capacitors. The connection state of the capacitor element 1 to the capacitor element 1 also had a small area and a large electrical resistance, leaving some concerns in terms of characteristics.

The present invention eliminates the above-mentioned drawbacks of the prior art.

Hereinafter, the present invention will be explained with reference to FIGS. 2 and 3 of the drawings of one embodiment.

10 is a capacitor element, and this capacitor element 10
The anode body is made of a sintered body or metal plate of a valve metal such as tantalum, niobium, or aluminum, and is then anodized to form an anodic oxide film that serves as a dielectric material.A semiconductor layer such as manganese dioxide is placed on top of the anode body. A cathode layer made of carbon, silver paint, etc. is provided on top of the cathode layer.

An anode internal lead wire 11 made of a valve metal is led out from the anode body of the capacitor element 10 while being insulated from the cathode layer.

An anode lead 12 formed by punching out a solderable metal plate is connected to this anode internal lead wire 11 .

This anode lead 12 is composed of a lead part 13 and a welded part 14 at the lower end of which projects so as to be inclined with respect to a line perpendicular to the lead part 13.The anode internal lead wire 11 is connected to this welded part 14. Connected by welding.

Further, a cathode lead 15, which is also formed by punching out a metal plate, is connected to the circumferential side of the capacitor element 10 by solder 16.

This cathode lead 15 has a lead portion 21 and an anode lead 12.
It has a triangular protrusion 17 that protrudes toward the anode electrode 12 side and is parallel to the tapered surface of the welding part 14 at a part corresponding to the welding part 14 of the welding part 14 . 14 and anode internal lead wire 11, and has a bent portion 18 bent in a direction away from the anode internal lead wire 11, and the capacitor element 10.
The connection portion 19 to the capacitor element 10 is inclined so as to cross over the capacitor element 10 .

In this way, the anode lead 12. The capacitor element 10 to which the cathode lead 15 is connected is coated with a resin sheath 2 by dipping.
0 is predominant.

This resin exterior 20 includes a welded portion 14 of the anode lead 12,
The protrusion 17 of the cathode lead 15 is molded.

With this configuration, the anode and cathode leads 12.1
The wide opposing welding parts 14 and protrusions 17 of No. 5 are tapered and are kept at a constant distance, and the cathode lead 15 is provided with a bent part 18 so that both leads 12 and 15 can be connected from the same cross section. Moreover, since it is soldered over the capacitor element 10 in a cross-over manner, there is no part that particularly protrudes from the capacitor element 10, and the resin sheath 20 adheres along the capacitor element 10, making it a small solid. Can be used as an electrolytic capacitor.

Further, since the connection area between the cathode lead 15 and the capacitor element 10 can be increased, the electrical resistance of the connection portion is reduced, and the stability in terms of characteristics is improved, and furthermore, the risk of damage to the connection portion due to external force is eliminated.

Furthermore, since the cathode lead 15 is provided with a bent portion 18, the distance between the welded portion 14 of the anode lead 12 and the connection portion 19 of the cathode lead 15 is greater than when a straight cathode lead 15 is used. becomes longer, the insulation distance can be increased, the insulation properties can be improved, and it can also be sufficiently applied to small capacitors.

Further, the projection 17 of the cathode lead 15 allows the resin exterior 2
0 does not constitute a concave portion between both leads 12 and 15, and a capacitor with a very regular external shape can be obtained, which is extremely advantageous in improving the product value.

In this way, in the solid electrolytic capacitor of the present invention,
Since the cathode lead has a lead part and a connection part, and a bent part in the middle that is bent away from the anode lead, the insulation resistance value between both leads is small even in a small device. can be made large enough.

These leads are then shaped by punching metal plates,
Moreover, since the shape is as described above, both leads can have a sufficiently wide width, and not only the resistance of the leads themselves but also the resistance of the connection portion between them and the element can be made sufficiently low.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional front view showing a conventional solid electrolytic capacitor.
FIG. 2 is a sectional front view showing one embodiment of the solid electrolytic capacitor of the present invention, and FIG. 3 is a sectional side view thereof. 10... Capacitor element, 11... Anode internal lead wire, 12... Anode lead, 13...
...Lead part, 14...Welding part, 15.
...Cathode lead, 16...Solder, 17.
...Protrusion, 18...Bent part, 19...
... Connection part, 20 ... Resin exterior, 21 ...
...Lead part.

Claims (2)

[Scope of utility model registration request] (1) A capacitor element 10 is provided, in which an anode body made of a valve metal from which an anode internal lead wire 11 is drawn out is provided with an anodic oxide film, a semiconductor layer, and a cathode layer. An anode lead 12 having a welded part 14 protruding at an angle with respect to the lead part 13 is connected to the anode internal lead wire 11, and a metal plate is similarly punched out to have a lead part 21 and a connecting part, and an intermediate part is formed by punching out a metal plate. A cathode lead 15 having a bent portion 18 bent so that the lead portion 21 is located on the same plane as the lead portion 13 is placed in surface contact with the cathode layer on the circumferential surface of the capacitor element 10. Connect by soldering,
A solid electrolytic capacitor having a resin exterior covering including the welded part 14 of the anode lead 12 and the bent part of the cathode lead 15. (2) A protrusion 17 with a tapered surface that protrudes toward the anode lead 12 side and has a certain distance from the welding part 14 of the anode lead 12 is provided on the upper part of the bent part 18 of the cathode lead 15. 17. A solid electrolytic capacitor according to claim (1) of the utility model registration, which is coated with a resin so as to include 17.