JPS61145815A - Capacitor - 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] Industrial applications The present invention relates to capacitors.

Prior Art Conventional capacitors have configurations as shown in FIGS. 4 and 6. That is, the evaporated electrode 2 is formed on the surface of the plastic film 10 by vacuum evaporation, the non-evaporated part 3 is provided in the longitudinal direction of the plastic film 1 so as to divide the evaporated electrode 2 in the width direction, and the plastic film 1 is wound. , a metallicon layer 4 was provided on the end face, and a lead wire 6 was connected to the metallicon layer 4.

Furthermore, other conventional capacitors use aluminum foil as electrodes, stack two to four dielectric films and wind them together with the aluminum foil, and connect lead wires to the aluminum foil.

Problems to be Solved by the Invention In the former case, since there are a plurality of capacitors in the width direction of the plastic film 1, non-evaporated portions 3 are formed in the winding direction to maintain insulation between each capacitor. There was a problem that the ratio of the area of the vapor-deposited electrode 2 to the area of the plastic film 1 was low. In addition, in order to increase the voltage resistance, the width of the non-evaporated part 3 must be increased, and in order to increase the number of capacitors in one element, the width of the plastic film 1 must be increased, which increases the volume. It had a major drawback.

Moreover, in the latter case, since it is an NH type, it is not possible to increase the potential gradient, and since three or four dielectric films are wound one on top of the other, it has the disadvantage of becoming bulky.

Means for Solving the Problems In order to solve the above-mentioned drawbacks, the present invention forms a vapor deposition electrode by vacuum-depositing aluminum or zinc on a plastic film, and a plurality of electrodes are formed on this vapor deposition electrode at appropriate equal intervals in the winding direction. A non-vapor-deposited part of a certain length is provided, and the central part of the non-vapor-deposited part is arranged and wound so that it is located at the center of the opposing vapor-deposited electrode, and a plurality of series capacitors are included in one element. be.

Function: With the above-described configuration, the present invention has a plurality of series capacitors arranged in the winding direction, so that the effective area of the vapor-deposited electrode relative to the area of the plastic film is increased. Further, the degree of freedom in the width of the non-evaporated portion is increased, and the number of series capacitors can be freely set without increasing the size of the device, resulting in higher voltage resistance and smaller size.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3.

In FIGS. 1 and 2, reference numeral A is a plastic film, on one side of which aluminum or zinc is vacuum-deposited to form a vapor-deposited electrode 8.

Reference numeral 9 indicates a non-evaporated part, and the evaporated electrode 8 is connected to the non-evaporated part 9 in the longitudinal direction (winding direction) of the plastic film.
are arranged alternately to obtain a specified capacitance. That is, the non-evaporated portions 9 are formed at regular intervals and have a constant length in the winding direction. 1o is an aluminum foil stacked on the vapor deposition electrodes 8 at both ends in the winding direction;
1 is a lead wire connected to the aluminum foil 10, and 12 is a winding core.

For the capacitor manufactured as described above, the effective vapor deposited electrode area relative to the area of the plastic film is 200 inches or more compared to the conventional method. Further, FIG. 3 shows the results of a DC voltage boost breakdown test using a capacitor molded with epoxy resin. As shown in Figure 3, with the same insulation configuration,
It was confirmed that the voltage resistance was higher than that of the conventional product (135 inches). Also,
The volume ratio is also 36% smaller than the conventional product. In addition,
In the above embodiment, the vapor-deposited electrode 8 is formed on one side of the plastic film, and the plastic film 7 is
Although we have explained the case where the plastic film is layered and wound, aluminum or zinc is vacuum-deposited on both sides (front and back) of a single plastic film to form vapor-deposited electrodes. A non-deposited part of a certain length is formed, the center of one non-deposited part is located at the center of the other deposited electrode, and the film is wound together with another plastic film to form one capacitor element. Even if a plurality of series-connected capacitors are formed within the capacitor, the same effect as in the above embodiment can be obtained.

Effects of the Invention As is clear from the above explanation, the present invention allows for miniaturization and high voltage resistance, and has great industrial value.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of essential parts of a capacitor showing an embodiment of the present invention, Fig. 2 is a partially exploded perspective view of the same capacitor, and Fig. 3 is a characteristic diagram showing the boosted breakdown voltage of the same capacitor and a conventional capacitor. , Figure 4 is a sectional view of the main part of a conventional capacitor, Figure 6
The figure is a partially exploded perspective view of the same capacitor. 7...Plastic film, 8...
Vapor deposition electrode, 9... Non-evaporation part. Name of agent: Patent attorney Toshio Nakao and 1 other person7.
... 7852 squares of film... Is it worth it? ... Volume Core Figure 2 Figure 3

Claims (2)

[Claims] (1) Aluminum or zinc is vacuum-deposited on a plastic film to form a vapor-deposited electrode, and non-evaporated parts of a certain length are provided at equal intervals in the winding direction so that a specified capacitance is obtained on this vapor-deposited electrode. A capacitor in which a plurality of series-connected capacitors are formed in one capacitor element by winding a pair of evaporated electrodes such that the non-evaporated part of one is placed at the center of the other evaporated electrode. (2) Vacuum-deposited aluminum or zinc is vacuum-deposited on the front and back sides of a plastic film to form vapor-deposited electrodes, and non-evaporated parts of a certain length in the winding direction are spaced equally apart from each other on the front and back of the vapor-deposited electrodes, and one non-evaporated part is A capacitor whose center is placed at the center of the other vapor-deposited electrode and wound together with another plastic film to form a plurality of series-connected capacitors within one capacitor element.