JPH046195Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a semiconductor snubber circuit for switching.
Concerning the structure of capacitors used in AC filter circuits, etc.

The requirement for this application is to reduce the residual inductance, and the method for achieving this is to connect the metal terminal directly to the capacitor element without using lead wires, and to create a low inductance capacitor by molding the exterior with epoxy resin. It is 057627.

The feature of this invention was not only its low inductance characteristics, but also its ability to reduce the overall size of the capacitor to almost the same size as the capacitor element.

However, the disk portion of conventionally used metal terminals did not have a perfectly flat surface due to distortion caused during the manufacturing process, and the thickness of the epoxy resin layer was required to be greater than that required for the moisture resistance of the capacitor.

The present invention was made to improve these points, and by making the disk part of the metal terminal completely flat, the epoxy resin layer was made even thinner, and the overall size of the capacitor was further reduced. It is something.

Along with the miniaturization, the amount of epoxy resin used also decreased, reducing costs.

Next, the present invention will be explained with reference to the drawings.

Figure 1 shows a conventional metal terminal, the disc part 2 of the metal terminal.
is not perfectly flat and curves upward. This is a distortion caused by heat during the manufacturing process of metal terminals, and even if the metal terminal is made by cutting from a single metal material, it is also possible to weld the cylindrical part 1 and disc part 2 together. The same problem occurs even if the parts are joined together.

There are several possible ways to remove this distortion, but three methods will be explained here.

In FIG. 2, the disc part 2 of the metal terminal is divided into two parts by making a notch 5 in the disc part 2.

The size, number, and location of the notches 5 are selected depending on the state of distortion so that the distortion of the disc part 2 is eliminated and the disc part 2 becomes flat with a minimum number of man-hours.

FIG. 3 shows a metal terminal in which a circular convex portion 6 is provided around the disk portion 2, and the shape, size, and shape of the convex portion 6 are
The number, location, etc. are selected depending on the state of distortion so that the distortion of the disk part 2 is eliminated and it becomes flat with the minimum number of man-hours.

Fig. 4 shows a method for removing strain by applying spot heating locally to the disc portion 2 of a metal terminal.The size, number, temperature, etc. of the spot heating portions 7 are selected depending on the state of distortion. To eliminate distortion in a disk part 2 and make it flat with a minimum number of man-hours.

Next, we spent such man-hours to remove the distortion in the disc part of the metal terminal, and the capacitor using a metal terminal with a flat disc part was replaced by a conventional metal terminal with a distorted disc part. I will explain how it is different from what I was used to and what kind of effects it has.

FIG. 5 is a structural diagram of a conventional capacitor using a metal terminal having a distorted disk portion.

The capacitor is connected to the outside through only the cylindrical portion 1 of the metal terminal, and the disk portion 2 is connected to the capacitor element 8 inside.

Therefore, the disc part 2 needs to be located in the filled epoxy resin 13.

In this case, if the disk portion 2 is distorted, the filled epoxy resin layer 13 becomes thicker and the axial dimension of the capacitor becomes larger.

FIG. 6 is a structural diagram of the capacitor of the present invention, which uses a metal terminal having a flat disk portion in which the distortion of the disk portion 2 of the metal terminal has been removed.

The fact that there is no distortion in the disk portion means that the actual thickness of the disk portion is thin, which means that the thickness of the filled Epoquine resin layer may be thinner accordingly.

Accordingly, the axial dimension of the capacitor becomes smaller, and the amount of filled epoxy resin is reduced, so that the cost can be reduced accordingly.

As described above, the present invention allows the overall size of the capacitor to be reduced even if metal terminals are added with the processes explained in Fig. 4, Fig. 2, and Fig. 3, and the amount of epoxy resin used is small. This is an improvement over the conventional low inductance capacitor, Utility Model Application No. 62-057627, based on the fact that the effect is greater.

[Brief explanation of drawings]

Figure 1 shows a conventional metal terminal with distortion, Figure 2 shows a metal terminal with distortion removed by a notch, Figure 3 shows a metal terminal with distortion removed by a convex part, and Figure 4 shows a dotted metal terminal. FIG. 5 is a structural diagram of a capacitor using a conventional metal terminal with distortion, and FIG. 6 is a structural diagram of a capacitor using an undistorted metal terminal according to the present invention. 1... Cylindrical part of the metal terminal, 2... Disk part of the metal terminal, 3... Screw, 4... Protrusion, 5... Notch,
6...Convex portion, 7...Point-like heating portion, 8...Capacitor element, 9 Metallicon electrode, 10...Soldering, 11...Winding core, 12...Epoxy case, 1
3...Filled epoxy resin.

Claims (1)

[Scope of utility model registration request] In a resin-molded capacitor with an axial output terminal, the distortion of the metal terminal disc, which is directly connected to the capacitor element by soldering, is removed, and the actual thickness of the disc is reduced, making it easier to use the filled epoxy. Low inductance capacitor with thin resin layer.