JPS61206211A - 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 Field of Industrial Application The present invention relates to a capacitor used in electrical equipment.

2. Description of the Related Art Capacitors in which metals such as aluminum and zinc are deposited on dielectric films such as polypropylene and polyethylene terephthalate have self-healing properties, so their characteristics remain stable during use.

Problems to be Solved by the Invention However, if a design with a very high potential gradient is required, or if use is required in a very high temperature range, the self-healing action will gradually be hindered.

The present invention aims to efficiently perform the self-recovery function of the capacitor in a high temperature range and under a high potential gradient, thereby solving the conventional problems.

Means for Solving the Problems As a result of various experimental studies regarding the above-mentioned problem, namely the efficiency of the self-healing action, the present inventors invented the method of forming a polyvinyl carbazole thin film on the vapor deposited electrode of a capacitor.

Function: According to the above configuration, it has been confirmed that a good self-healing action progresses even under high temperature range and high potential gradient, and that various characteristics of the capacitor remain extremely stable. The thin film of polyvinyl carbazole can also be produced by depositing solid vinyl carbazole on a deposition electrode in the atmosphere or under vacuum, and polymerizing it by irradiation with ultraviolet light from a high-pressure mercury lamp or by heat curing treatment at 100 to 130°C.

Moreover, if the thickness of this polymer thin film is 208 cm or more, the metal electrode will be coated with an insulating material. In other words, it becomes a dielectric.

However, at 20 Å or less, in terms of capacitor structure and use, the capacitance value, tan δ value, and insulation resistance value are equivalent to those in the case where no film is provided, and the region in which self-healing property progresses favorably expands.

Example The following table shows examples and effects of the present invention.

In the following margin, the film thickness was measured by the capacitance method. A metal was deposited on a dielectric film having a thickness of 6 μm to form an electrode, and a capacitor t with a rating of 30 μF and 250 V was created under the same conditions.

A continuous durability test was carried out at an ambient temperature of 80"C by applying an AC voltage of 1.3 times higher to this capacitor, and the capacitance reduction rate was measured after 1000 hours. As a result, the polyvinyl carbazole thin film of the present invention was formed on the surface of the vapor-deposited metal. It was found that this value was extremely low for the products that underwent this treatment, and that the value for conventional products that had not been subjected to this treatment was around 6%.At the same time, the smaller the capacity reduction rate, the less the discharge marks during self-recovery. It was also confirmed that the insulation distance was large, the dimensions were uniform, and there were few carbonization marks.

As described above, according to the present invention, the range of completeness of self-healing action can be expanded, and a capacitor that is stable under more severe conditions can be provided, and its industrial efficiency is great.

Claims (1)

[Claims] A capacitor characterized in that a vinyl carbazole film of 20 Å or less is deposited on a metal surface of a metallized dielectric film, and the vinyl carbazole film is polymerized.