Electrolytic capacitor

Details Electrolytic capacitor Electrolytic capacitor

1985-05-09

1987-02-17

Hix, L. T.

Electricity: electrical systems and devices

Miscellaneous

361306, 174 5052, H01G 900, H01G 114

Patent

active

046444467

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION



TECHNICAL FIELD

This invention relates to an electrolytic capacitor wherein capacitor element is encapsulated in a metal case and is to be inserted and fixed on a printed circuit substrate.


BACKGROUND ART

This kind of conventional electrolytic capacitor has been constituted as shown in FIG. 1. That is, capacitor element 1 made by winding an anode foil and a cathode foil together with a separator and soaking with an electrolyte for operation is enclosed in a metal case which is of a cylindrical shape having a bottom, open end of which is sealed with a terminal plate 3; and mounting on a printed circuit substrate is made with terminals 4 by electrically and mechanically connecting and fixing them.
Furthermore, recently a snap-in type terminal configuration has been proposed as shown in FIG. 2. This kind of electrolytic capacitor has terminals 5 of curved shape and furthermore, end tip of them are narrow, thereby making insertion on the printed circuit substrate easy.
The electrolytic capacitor has polarity as is well known, and in case it is mounted with wrong polarity not only function as the electrolytic capacitor is not achieved but also there is a danger of fire, and the opposite insertion must be practically nil. Therefore, hitherto indicating part 6 is provided on an outside sleeve or indication has been made on rivets 7 for fixing terminal.
In such case, polarity confirming of the electrolytic capacitor must be made by eye, and in actual mounting operation sometimes mounting errors (opposite insertion) occur thereby inducing unexpected accidents.
Furthermore, since such kind of electrolytic capacitor is larger in size and more heavy in weight in comparison with other electronic components, when it is mounted on a printed circuit substrate and the apparatus is vibrated, effect on the printed circuit substrate centers around terminal parts of the electrolytic capacitor and peeling off of copper foil of the printed circuit substrate or the like has happened.
Furthermore, in actual mounting operation, such kind of aluminum electrolytic capacitor together with other electronic components are soldered, and thereafter to flux washing-out is carried out to remove pine resin. In such case, washing agent is retained in a gap between the printed circuit substrate and the electrolytic capacitor; and since the washing agent is constituted with organic chrolide compound, it has become a cause to make corrosion defect of the aluminum electrolytic capacitor.


DISCLOSURE OF INVENTION

Accordingly, this invention intends to provide an electrolytic capacitor which is free from occurrence of mounting error or corrosion defect, by providing a pin which is formed integral with an anode terminal or a cathode terminal in an electrolytic capacitor wherein a capacitor element is enclosed in a case.


BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is the sectional view of the general electrolytic capacitor;
FIG. 2 is a perspective view showing terminal part of the conventional electrolytic capacitor;
FIG. 3 and FIG. 4 are a perspective view and a plan view showing terminal part of an electrolytic capacitor in accordance with one embodiment of the present invention, respectively;
FIG. 5 and FIG. 6 are a perspective view and a plan view showing terminal part of an electrolytic capacitor in accordance with another embodiment of the present invention, respectively;
FIG. 7 is a perspective view showing a terminal part of an electrolytic capacitor of one example of another embodiment in accordance with the present invention;
FIG. 8 is a sectional view showing a state wherein an electrolytic capacitor in accordance with the present invention is actually mounted on a printed circuit substrate.


BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 3 and FIG. 4 show one embodiment of an electrolytic capacitor in accordance with the present invention, and in FIG. 3 numeral 10 is a metal case in which capacitor element is enclosed, and open end of this metal case is sealed by a terminal plate 11. On this terminal plate 11, an anode t

REFERENCES:
patent: 3644796 (1972-02-01), Carino

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