JPS59227115A - Ac metal deposition film 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 The present invention relates to an alternating current applying capacitor having a surface (metal-deposited 1tflfi) of polyester film, polypropylene film, polyethylene film, etc.

Conventionally, capacitor paper, polyester film, polypropylene film, etc. have been mainly used as the dielectric material for condensers for ACs, and the dielectric material is aluminum,
Capacitors coated with zinc or the like are frequently used.

Furthermore, in recent years, metal-deposited polyester films, metal-deposited polypropylene films, etc. have been increasingly used in conjunction with the trend toward smaller and lighter AC equipment capacitors. Gold vapor-deposited film components that take advantage of the superior electrical properties of these plastic dielectrics are expected to continue to develop in the future.

In addition, capacitors using these m-electric materials are manufactured not only in dry construction, but also in oil-impregnated capacitors, which are so-called roughened films in which the surface roughness of the plus deck film dielectric material is increased due to oil impregnation. etc. are also used.

The working voltage range of this capacitor is 100■△C~500V
It is AC, and there is a tendency to expand further to the high 11 side in the future. However, when metal-deposited film capacitors are used at these elevated locations (on a Q-slanted surface), various scale voids occur during winding of the capacitor element, voids due to surface roughness of the dielectric film, and voids after oil impregnation. Parts 77 where moisture, organic matter, etc. adhere to the impregnated part, the dielectric surface, etc.
On the 51st, a new coronavirus will occur. If these coronas persist for a long time, the metal vapor-deposited electrode will scatter and disappear, resulting in a decrease in the electrode area and a decrease in capacity. Currently, it cannot be used due to the slope. Furthermore, when used at high ambient temperatures and high potential gradients, the surface of metal electrodes such as aluminum and zinc partially transforms into a type of oxide, causing it to lose its function as an electrode and turn into an electrical insulator. In this case, the result is a decrease in the 6-condens V capacity.

In view of the current situation, the inventors of the present invention have made extensive studies and have found a method for improving the above-mentioned drawbacks. That is, in the present invention, an aluminum, laminate, or zinc electrode is formed by metal vapor deposition on one or both sides of a polypropylene film, and an insulating layer made of an organic substance is formed on the electrode with a thickness of 10 to 50%.
007Ingst[1-me, preferably 500-200
The present invention provides a metal-deposited film capacitor characterized in that it uses a metal-deposited dielectric that is uniformly provided with a thickness of 0 angstroms and protects the Ti electrode of the metal-deposited layer.

Since the dielectric film used in the present invention is a condenser for AC equipment, it is suitable for use at relatively high voltages.
From the viewpoint of preventing self-heating, polypropylene film is mainly considered.

Then, on this dielectric film, a layer of aluminum, zinc, etc., with a thickness of 200 to 800 angstroms, is deposited on at least one side of the dielectric film by a conventional method. It is common to use them together. Further, a method of subjecting the surface of the dielectric film to a corona discharge treatment or the like to improve the adhesion of vapor-deposited metal can also be applied to fJl.

The explanation will be given below according to the diagram.

FIG. 1 shows a cross section of a metallized vapor deposited film of a conventional construction. In a =1 capacitor having this configuration, especially when the vapor-deposited metal is aluminum, the capacitor capacity decreases in one continuous durability test of the capacitor when a high temperature and high potential gradient is applied. FIG. 2 shows a cross section of a metallized vapor deposited film according to the configuration of the present invention. That is, the insulating WJ 3 is continuously and uniformly provided on the vaporized electrode 2 of the conventional method. The insulating layer may be a polymer resin layer such as polyethylene, borino L1 pyrene, polystyrene, polyJ nytylene terephrate, etc., or may be a silicone resin layer, microcrystalline wax, etc.
There is no limit to the size etc.

To unravel and uniformly adhere the insulating layer, conventional methods such as individual coating, dry lamination, printing, vacuum deposition, and long beam deposition can be used. The most preferable method is that it can be done uniformly. Further, although the conventional solvent-based coating method is undesirable because the polymer film is thin and difficult to obtain uniformity, it is not impossible to use.

The thickness of the insulating layer can be measured by an interferometry method that uses optical interference. If the thickness is less than 10 angstroms, the effect of the present invention cannot be clearly determined;
When the thickness exceeds 5,000 angstroms, the dielectric properties of the insulating layer polymer cannot be ignored and it becomes a composite M electric material, and the tan δ characteristics of the 7'' conductor decrease. Additionally, there is a tendency for the adhesion of metal on the end face of the element to be poor.

Hereinafter, the first embodiment of the present invention and a comparative example of the conventional method will be described.
It is written together with the table.

In both Examples and Comparative Examples, aluminum and zinc were vapor-deposited on one side of polypropylene with a thickness of 8 μm by a conventional method. In this case, the film width was 75IIlln, and the width of the margin portion was 2.5IIlln. In the embodiments of the present invention, polyester (hereinafter referred to as PET-) and polypropylene (hereinafter referred to as PP) are thinly and uniformly applied to the metal-deposited film using a vacuum deposition method. was deposited on. Then, these metal-deposited dielectric films were tightly wound around a plastic core to produce a capacitor element. The capacitor element was then heat-treated in a conventional manner and packaged with poxy resin.

Table 1 shows the rate of change in capacity due to continuous durability tests. As is clear from this, iJ [metal vapor deposited on the body film, and furthermore] is thin and uniform! It can be seen that the capacitor according to the present invention provided with three edge layers has a significantly reduced rate of change in capacitance after 500 hours compared to the conventional capacitor (b).

Table 1

[Brief explanation of the drawing]

FIG. 1 shows a sectional view of the basic structure of a metal vapor-deposited film l\ by a conventional method, and FIG. 2 shows a sectional view of the basic structure according to an embodiment of the present invention. 4 is a comparison table between an embodiment and a conventional example for detailed explanation of the present invention. 1... Dielectric film, 2... Metal vapor deposited electrode, 3...
...Insulating layer. Special FFal applicant Toyo Metallizing Co., Ltd. procedure for admission
iF document (with text) Kazuo Wakasugi, Commissioner of the Japan Patent Office, 1981, Indication of the case, 1982, Patent Application No. 100935, 2, Name of the invention, Metal-deposited film capacitor for alternating current 3, Sound representative for correction President Yasuo Shinohara 4, Agent name: Patent attorney (705(3) Hajime Omura 5, Date of amendment order: September 278, 1982 (shipment date) 6, Number of inventions increased by amendment 07. Subject of amendment The description of the content of the amendment in column 8 of "Brief Description of Drawings" of the specification will be deleted.

Claims (1)

[Claims] Aluminum or zinc electrodes are formed by metal vapor deposition on one or both sides of a polypropylene film, and a metal vapor-deposited dielectric material is used, in which a 10 to 5000 angstrom strip of organic material is uniformly provided on the aluminum or zinc electrode. Full bending evaporated film capacitor for use.