JPS5910741Y2 - capacitor - Google Patents

Description

[Detailed description of the invention] The present invention is a capacitor element in which strips of dielectric material such as capacitor paper or plastic film and strips of electrode foil are alternately stacked and wound. This invention relates to a container with an improved eyepiece provided for sunrise use.

Generally, a capacitor element is made by winding a dielectric material 1 such as strip-shaped capacitor paper or plastic film and a strip-shaped electrode foil 2 alternately, as shown in FIG. Alternatively, a plurality of sunrise pieces 3 formed by cutting metal strips of copper or the like into predetermined lengths are interposed to form external connection terminals.

However, according to the above structure, since the opening piece 3 is formed by cutting thin aluminum or copper, protrusions such as burrs may be formed at the cut portion during this cutting process. There was a risk that the two surfaces of the dielectric material would be damaged due to this, and this would cause dielectric breakdown.

For this reason, conventionally, as shown in FIG. 2, a protective insulating material 4 such as capacitor paper is placed on one side of the outlet piece 3 and inserted between the laminated layers of the dielectric 1 and the electrode foil 2. According to this, it is necessary to check the misalignment of the cover 4 with respect to the eyepiece 3 each time the eyepiece 3 is inserted, and the winding work of the capacitor must be interrupted each time, which significantly reduces the work efficiency. There was a drawback.

Also, in order to perform this winding work smoothly without stopping, it is possible to fix the insulating pad 4 to the eyepiece 3 using an adhesive such as varnish and construct it as an integral part. An air layer tends to form in the agent or between the dielectric material 1 and the electrode foil 2, and even if vacuum treatment is performed, it is difficult to completely remove the air layer. Cavities, or voids, are likely to form in the structure, which may also cause dielectric breakdown.

The opening piece 3 is a flat strip, and when the capacitor element is tightened after being inserted into the capacitor element and brought into conduction with the electrode foil 2, the contact between the electrode foil 2 of the capacitor element and the opening piece 3 per unit area is reduced. The pressure decreases in inverse proportion to the contact area of the sunrise piece 3.

Therefore, the contact resistance is large and reliable conduction cannot be maintained, so at present, the number of lead pieces 3 inserted into the capacitor element is increased and the contact pressure is increased.

The present invention was developed in view of the above circumstances, and aims to prevent damage to the dielectric material, increase the contact pressure per unit area between the electrode foil and the eyepiece, and improve workability during winding work. The purpose is to provide a capacitor with a sunrise piece that can be used.

An embodiment of the present invention will be described below with reference to the drawings.

The method of alternately stacking the dielectric strips 1 and the electrode foils 2 and winding them is the same as that of a conventional capacitor element, so a description thereof will be omitted. I will explain about the sunrise piece.

That is, as shown in FIG. 4, a thin aluminum or copper metal strip is cut to a predetermined length, and only the flat part excluding a few millimeters around the periphery is embossed to form the eyepiece 5.
This sunrise piece 5 is inserted between the electrode foil 2 and the dielectric 1.

In this way, there is no slippage, and since the sunburst piece 5 is embossed only on the flat surface excluding a few millimeters around the periphery, the sunburst piece 5
Embossing is not applied to the protrusions that appear on the cut portion (the periphery of the sunrise piece) when it is cut.

For this reason, the convex portions formed by embossing on the flat surface of the electrode foil 2
and the dielectric 1, and the protrusion is arranged within this interval so that it does not come into contact with the dielectric 1.

Therefore, the dielectric 1 is not damaged by the protrusion on the periphery of the eyepiece 5, and dielectric breakdown can be prevented.

In addition, when inserting the sunrise piece 5 between the dielectric 1 and the electrode foil 2, inserting it so that the side where the protruding parts such as Paris are exposed is on the electrode foil 2 side. Damage to the dielectric 1 caused by the protrusions can be prevented.

Furthermore, as shown in FIG. 3, which shows the relationship between contact pressure and contact resistance, when the embossed sunburst piece 5 is used, b is flatter than when the conventional sunburst piece is used, a.

In other words, even if the contact pressure is low, the contact resistance is low,
The electrical continuity between the sunrise piece 5 and the electrode foil 2 is ensured.

This eliminates the need to increase the number of inserted pieces or increase the tightening pressure as in the past, making the winding work easier.

Further, unlike the conventional method, there is no need for an insulating material, and the winding of the capacitor element can be performed continuously, thereby improving work efficiency.

As described above, the present invention provides a capacitor that reduces contact resistance, prevents damage to the dielectric, does not induce dielectric breakdown, has excellent reliability and quality, and can improve winding work. can be provided.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional capacitor, Fig. 2 is a perspective view showing a conventional eyelid piece and an insulating cover, and Fig. 3 is a perspective view showing a conventional eyelid piece and an eyelid piece used in the present invention. FIG. 4 is a perspective view of the eyepiece used in the capacitor of the present invention. 1... Dielectric material, 2... Electrode foil, 5...
...Tadehata.

Claims (1)

[Scope of utility model registration request] A metal foil and a dielectric material are alternately layered and wound, and an eyepiece formed by cutting a metal strip to a predetermined length is interposed between the metal foil and the dielectric material, as described above. An enhancer characterized in that the opening piece is embossed only on the flat part of the metal strip except for a few millimeters around the periphery.