JP2533025Y2 - Solid electrolytic capacitors - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a solid electrolytic capacitor, and more particularly, to a structure of a lead-out portion of a valve metal anode lead embedded in a valve metal anode body.

[Conventional technology]

Conventionally, in this type of solid electrolytic capacitor, the second
As shown in FIGS. 1 (a) and 1 (b), a valve action metal anode lead (hereinafter abbreviated as anode) 2 embedded in a valve action metal anode body (hereinafter abbreviated as anode body) 1 is provided with, for example, a Teflon insulator. Such an insulating plate 3 is passed so as to be close to the anode body 1, or FIG. 3 (a), (b)
As shown in FIG. 3, the lead portion of the anode lead 2 has a water repellent 4 applied and cured after application.

[Problems to be solved by the invention]

In the conventional solid electrolytic capacitor described above, when the insulating plate 3 shown in FIGS. 2 (a) and 2 (b) is used,
A gap 6 is likely to be formed between the anode lead 2 and the insulating plate 3, and during the decomposition step for forming the semiconductor layer after the formation of the dielectric film by the chemical conversion step, the manganese nitrate solution 5 After infiltrating between the anode lead 2 and the insulating plate 3, the anode lead 2 crawls on the anode lead 2 through the gap 6 between the insulating plate 3 and the semiconductor layer is formed on the anode lead 2. Therefore, there is a disadvantage that short-circuit failure often occurs after the anode is pulled out.

On the other hand, when the water repellent 4 shown in FIG. 3A is used, the gap 6 with the anode lead 2 is less likely to be generated, but the gap 6 shown in FIG. As shown in ()), since the interface thickness with the manganese nitrate solution 5 is small, the water repellent effect is weak and the manganese nitrate solution 5 gets over the water repellent 4 and reaches the anode lead 2, and a semiconductor layer is formed on the anode lead 2. Therefore, short-circuit failure often occurs as described above.

As described above, in any case, there is a problem in the water repellency of the manganese nitrate solution.

The purpose of the present invention is to prevent the manganese nitrate solution from creeping up between the anode lead and the insulating plate to the anode lead, and to compensate for insufficient water repellency when only a water repellent is used, and to provide a semiconductor on the anode lead. It is an object of the present invention to provide a solid electrolytic capacitor capable of preventing the formation of a layer and reducing the possibility of short-circuit failure after extracting an anode.

[Means for solving the problem]

In the configuration of the present invention, the anode lead made of a valve metal is led out from the upper surface of the capacitor element, and the insulating plate through which the anode lead penetrates is provided in the solid electrolytic capacitor provided on the upper surface. A water repellent is filled in a gap between the conductive plate and the conductive plate.

〔Example〕

Next, the present invention will be described with reference to the drawings. First
FIG. 1A is an enlarged view of an anode lead lead-out portion of one embodiment of the present invention, and FIG. 1B is a side sectional view showing a disassembly process of the embodiment shown in FIG. 1A. .

1 (a) and 1 (b), reference numeral 1 denotes an anode body having a dielectric film formed on the surface, and reference numeral 5 denotes a manganese nitrate solution. For example, a water-repellent agent 4 made of a fluorine-based resin is applied and cured in a gap between the anode lead 2 and an insulating plate 3 made of Teflon having a thickness of, for example, about 0.3 mm and a diameter of about 1 mm. Is obtained, and the manganese nitrate solution 5 does not crawl on the anode lead 2 through the gap between the anode lead 2 and the insulating plate 3.

By implementing the present invention, it was possible to eliminate the problem of short-circuit failure in the anode extraction process while manufacturing a good capacitor element.

[Effect of the invention]

As described above, the present invention has an insulating plate passed through an anode lead and adjacent to an anode body, and a water repellent interposed between the anode lead and the insulating plate. It is possible to obtain the effect of preventing the manganese nitrate solution from creeping up to the anode lead from the gap between the insulating plate and the manganese nitrate solution and to compensate for insufficient water repellency when only the water repellent is used. In addition, the present invention has an effect that it can be mounted on the same mounting board as that of the related art because it is not necessary to change the shape and dimensions.

[Brief description of the drawings]

FIGS. 1 (a) and 1 (b) are enlarged views of an anode lead lead-out portion according to an embodiment of the present invention and a water-repellent effect of the anode lead lead-out portion of an anode body having a dielectric film formed on a surface thereof. FIGS. 2 (a) and 2 (b) are enlarged views of the anode lead lead-out portion using only the conventional insulating plate, and FIG. FIGS. 3 (a) and 3 (b) are schematic diagrams showing a situation in which a manganese nitrate solution is crawling up from the gap between the insulating plate and the anode lead. FIGS. FIG. 4 is a schematic diagram showing a state in which the manganese nitrate solution has passed over the water repellent and reached the anode lead as a result of the insufficient water repellent effect in FIG. 3 and FIG. 3 (a). DESCRIPTION OF SYMBOLS 1 ... valve action metal anode body, 2 ... valve action metal anode lead, 3 ... insulating plate, 4 ... water repellent, 5 ... manganese nitrate solution, 6 ... gap, 7 ... anode lead Manganese nitrate solution crawled up.

Claims (1)

(57) [Scope of request for utility model registration] An anode lead made of a valve metal is led out from an upper surface of a capacitor element, and an insulating plate through which the anode lead passes is a solid electrolytic capacitor provided on the upper surface. A solid electrolytic capacitor characterized in that a water repellent is filled in a gap between the plate and the plate.