Capacitor

Details Capacitor Capacitor

1998-12-02

2001-02-06

Kincaid, Kristine (Department: 2831)

Electricity: electrical systems and devices

Electrostatic capacitors

Fixed capacitor

C361S311000, C361S303000, C361S301100

Reexamination Certificate

active

06185086

ABSTRACT:

TECHNICAL FIELD OF THE INVENTION
The present invention relates to a capacitor used in an electric appliance for the purposes of driving a motor, improving the power factor, charging and discharging, smoothing, and the like.
BACKGROUND OF THE INVENTION
A sectional view of a conventional capacitor is shown in FIG.
7
. Hitherto, as shown in
FIG. 7
, a capacitor element
25
connecting a terminal
23
was put in a resin case
26
, and it was filled with an insulating resin
24
. An explanatory diagram for installing such capacitor in appliances is given in FIG.
8
. In
FIG. 8
, a terminal
23
is connected to an electronic appliance
28
by using a connector
29
and a wire
27
. In this case, a capacitor is often connected to the electronic appliance by soldering or welding, instead of using the connector
29
. Also, to insulate and protect the wire junction, a rubber or plastic protective cover
30
was merely fitted to cover the junction.
In such prior art, it was a problem that the mechanical strength of the wire junction was inferior. That is, the crimping portion of the wire
27
and connector
29
was easily folded and bent, and the wire was often broken. Or, if an excessive vibration is applied, the wire may be broken due to its stress. Or, if the wire is connected by welding or soldering, the mechanical strength of the wire junction is much lower. Thus, in the conventional capacitor, there was a high possibility of occurrence of folding of wire junction, excessive mechanical stress, and vibration in the appliance manufacturing process, during transportation, or in actual use. Hence, the wire junction is likely to be broken.
Still more, it is also desired to enhance the electric insulation of the terminal area against moisture and dust, and as shown in
FIG. 8
, the surface
41
of the insulating resin
24
filling up between the capacitor element
25
and resin case
26
is a concave surface. This is due to the surface tension of the material of the insulating resin being used. When a water drop deposits on the resin surface, the water drop is likely to be collected in this shape. Or, as shown in
FIG. 8
, the protective cover
30
was place to cover the connecting part merely, and it had no waterproof effect against water drop. These conventional capacitors are inferior in dustproof property, and therefore, when conductive dust deposits on the terminal area, the electric insulation of the terminal may be extremely impaired. Such capacitors are widely used in electric appliances high in possibility of exposure to water such as refrigerator and washing machine. In particular, when the capacitor is installed in an orthostatic state, further improvement from the conventional properties are demanded in the waterproof performance to water in the terminal area and the electric insulation against water and dust as mentioned above.
Other example of conventional capacitor is shown in FIG.
9
. In
FIG. 9
, a wire
27
is buried in the insulating resin
24
. Accordingly, if the wire
27
is bent, it is not folded at the junction. Therefore, the bending strength of the junction is assured, but when used for a long time, the coating of the wire changes in the time course and the coating of the armor deteriorates, and the outside diameter becomes smaller. As a result, a gap is gradually formed between the wire
27
and insulating resin
24
, and water or dust may invade through such gap. As a result, the function of the capacitor may be lost.
SUMMARY OF THE INVENTION
The capacitor of the invention enhanced in mechanical strength and electric insulation comprises a capacitor element having a terminal, an electric insulating material disposed to cover the capacitor element, a wire connected to the terminal, and reinforcing means disposed at the junction for connecting the terminal and the wire.
In this constitution, against mechanical stress or vibration to the capacitor from the outside, the mechanical strength and electric insulation at the junction of the terminal and wire are stably maintained, and the long-term reliability is enhanced. Moreover, invasion of moisture or dust into the capacitor is prevented, and the mechanical strength and the life of electric insulation are enhanced, so that the capacitor having a stable reliability for a long period is obtained.


REFERENCES:
patent: 3431473 (1969-03-01), Cormier et al.
patent: 3684927 (1972-08-01), Correll
patent: 3775527 (1973-11-01), Kinney, Jr. et al.
patent: 4656556 (1987-04-01), Westermann
patent: 4962446 (1990-10-01), Asakura et al.
patent: 5142436 (1992-08-01), Lee et al.
patent: 5412532 (1995-05-01), Nishimori et al.
patent: 5546058 (1996-08-01), Azuma et al.
patent: 5850332 (1998-12-01), Kunieda et al.
patent: 5944567 (1999-08-01), Ratajczak et al.
patent: 5972139 (1999-10-01), Chu
patent: 5978203 (1999-11-01), Kiyomura et al.

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