JPS58142519A - Condenser - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves vapor deposition and sputtering of metal electrodes on the surface of dielectric films such as plastic films and paper.

This invention relates to a capacitor constructed by winding a metallized film formed by an ion blating method or the like.

In conventional film capacitors, as shown in the typical example in Figure 1 or Figure 2, metal foil is used for the electrode, and the foil type is wrapped with a dielectric film and wrapped. There are two types: one is a metallized type, and the other is a metallized type, in which a metalized film, in which a metal electrode is formed by vapor deposition or the like on the surface of a dielectric film, is layered and wound. In the former method, as shown in FIG. 1, a dielectric film 2 and a metal foil 1 used as an electrode are used, and an insulating groove (about 1.0 to 6.0 mm) is formed at the end of the film in the width direction. In addition, a metal foil of approximately 1.0 to F5.0 mm is provided at one end for electrode extraction.
A capacitor element is constructed by overlapping and winding the dielectric film 2 and the metal foil 1 with the metal foil 1 protruding from both ends, and connecting the lead wire 3 to the metal foil 1 protruding from both end faces by welding or the like. be.

However, in a capacitor having such a structure, the metal foil 1 tends to form a meandering shape in the film width direction during winding, and as a result, the dimensional accuracy of the margin portion and electrode facing width cannot be obtained sufficiently. If the dimensional accuracy is not sufficient in this way, a margin part larger than necessary will be formed, and the electrode facing width will vary, making the fabric unstable by 3 bases of capacitance after winding. . In addition, since the metal foil 1 is used for the electrode, there is no self-healing effect, and the dielectric film 2 is made smaller by reducing its thickness.

It was difficult to reduce the weight.

However, despite these inconveniences, it has excellent productivity as it can be produced using very simple equipment.

On the other hand, in the case of the metallized type shown in FIG. 2, two metalized films 4 are stacked and wound, and a metal material such as Zn or Sn is thermally sprayed on both end surfaces of the wound metallized film 4 to form electrodes. A method is used in which a lead-out portion 6 is formed and a lead wire 3 is connected to this by welding or the like to form a capacitor element.

In film capacitors, the dielectric film and electrodes are integrated, so compared to foil-type capacitors that use metal foil for the electrodes,
It is widely used because it is easy to stabilize the capacitance distribution and has a self-healing effect, making it easy to make the dielectric film thinner. , a process of thermally spraying a metal material to form the electrode extension part 6 is absolutely necessary, and since this process is a very important part in terms of capacitor characteristics, strict control is required and equipment costs are high. There are problems in terms of production.

The present invention is intended to improve each of these conventional problems, that is, it improves the dimensional accuracy of the margin part and electrode facing width, stabilizes the capacitance distribution, provides a self-recovery function, and allows for simpler equipment. This provides a highly productive capacitor structure that can be produced in Hereinafter, the capacitor according to the present invention will be explained using the drawings of FIGS. 3 to 7.

FIG. 3 shows a capacitor according to an embodiment of the present invention. In the figure, 6 is a metallized film in which electrodes 6b are formed on both sides of a dielectric film 6a such as a plastic film or paper. The electrodes 6b are formed such that margin portions 6C are formed at both ends of the film in the width direction. Reference numeral 7 denotes a metal foil as an auxiliary electrode, and this gold oval foil 7 is superimposed on the surface of the electrode 6b of the metallized film 6, and is used for drawing out the external electrode. Reference numeral 8 denotes a laminated film that is wound over the metallized film 6. By overlapping and winding the laminated film 8 and the metallized film 6, a capacitor element is constructed. A portion of the metal foil 7 is exposed on both end faces.

FIG. 4 shows another embodiment of the present invention in which a single-sided gold plated film is used, and in the figure, 6' is a metallized film in which an electrode 6b' is formed on one side of a dielectric film 62L'. In the metallized film 6', electrodes 6b are formed so that margin portions 6C are formed at both ends as in the previous embodiment.

In this embodiment, no laminated film 8 is used;
A capacitor element is constructed by using two metallized films 6 and winding the two metallized films 6 one on top of the other.

Figure 6 shows a comparison of the capacitance distribution of the capacitor of the present invention and two conventional types of capacitors (foil type and metallized type), and Figure 6 shows the case where a polyester film is used as the dielectric film. The production potential gradient (V/μ
) are shown in comparison. In addition, FIG. 7 shows a case in which margin portions are provided at both ends of the film in the width direction in the present invention using metal foil as an auxiliary electrode (product of the present invention);
Compared to the conventional case where a margin section is provided only at one end in the width direction of the film (comparative product), the i
11 shows a comparison of the distribution of insulation resistance values after connecting the ll IJ- wires.

As described above, according to the capacitor of the present invention, since capacitance is obtained on the surface of the metallized film facing the electrode, the capacitance distribution becomes stable, and moreover, the capacitance of the metal foil in the width direction of the film during winding becomes stable. Since meandering has no relation to capacitance,
It is easy to wind up, and since it has a self-recovery function, it can be made smaller and lighter by improving the potential gradient. In addition, since metal foil is overlaid and wound as an auxiliary electrode on the electrode surface of the metallized film, electrode extraction can be easily performed in the same way as with conventional foil-type capacitors, and the equipment and work required to conduct metallization can be easily performed. Since this method does not require , it is possible to improve productivity and reduce costs. Furthermore, since the electrodes are formed on the metallized film so that margins are formed at both ends, short circuits may occur due to the effect of contacting the lead wires.
The effect that insulation properties do not deteriorate can be obtained.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing the main structure of a conventional capacitor, FIGS. 3 and 4 are cross-sectional views showing the main structure of a capacitor according to the present invention, and FIGS.
FIG. 7 is a diagram for explaining the effects of the capacitor of the present invention. 6.6...Metalized film, 61L, 61L・
...Dielectric film, eb, eb'...
Electrode, 6o, ec'...Margin part, 7...
...Metal foil, 8... Laminated film. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] It is constructed by winding a metallized film with electrodes formed on the surface of a dielectric film, and insulating grooves are provided at both ends of the metallized film in the width direction, and an auxiliary electrode is provided on the electrode surface of the metallized film. A capacitor characterized by overlapping metal foils and having electrodes drawn out using the metal foils.