JPH056835A - Manufacture of high-voltage film capacitor - Google Patents

Abstract

PURPOSE:To obtain a high-voltage film capacitor wherein its characteristic is stable and its reliability is high by preventing air bubbles form being left when a plurality of films are laminated and wound. CONSTITUTION:In a state that individual films (10 to 15) have been laminated, they are passed between heat rollers 2a, 2b together with films wherein thermally bonded layers are formed on one face or on both faces of respective interlayer dielectric films and electrodes have been formed; the individual films are thermally bonded; the bonded and laminated films are wound.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a high voltage film capacitor which is formed by laminating a plurality of dielectric films.

[0002]

2. Description of the Related Art For example, in a flyback transformer, C
A high voltage film capacitor is used as a smoothing capacitor for supplying a DC high voltage to RT.

In this type of conventional high voltage film capacitor, electrodes made of a metal vapor deposition film such as aluminum or a metal foil are arranged in a zigzag pattern in the longitudinal direction on a dielectric film, and the electrodes are laminated with the dielectric film interposed therebetween. It is manufactured by winding.

Further, in order to bring the films to be laminated into close contact with each other, a heat fusion layer is formed on one surface or both surfaces of each interlayer dielectric film, and the films are brought into close contact with each other by heat aging at a predetermined temperature in a wound state. I am letting you.

[0005]

However, in such a conventional method for manufacturing a high voltage film capacitor, since each film is laminated, wound and then heat-sealed, a small amount of the film wound with the film is wound. Air remains inside the capacitor element and remains as bubbles inside the element after thermal fusion, and it is difficult to completely remove this. Therefore, there is a problem in that the characteristics of the high voltage film capacitor, especially the withstand voltage characteristics, may deteriorate depending on the case.

An object of the present invention is to provide a method for manufacturing a high-voltage film capacitor having stable characteristics and high reliability by eliminating bubbles remaining inside the element during heat fusion.

[0007]

According to the method of manufacturing a high voltage film capacitor of the present invention, an interlayer dielectric film having a heat-sealing layer formed on one surface or both surfaces thereof is laminated with a film having electrodes formed thereon. It is characterized in that each film is heat-sealed between the films and the fused laminated film is wound.

[0008]

In the method of manufacturing a high voltage film capacitor according to the present invention, a heat-sealing layer is formed on one surface or both surfaces of an inter-layer dielectric film, and the films are laminated together with the electrode-formed film to pass between the heat rollers. To be done. This melts the heat fusion layer heated by the heat roller,
Adjacent films fuse together. At that time, when the air inside the laminate passes between the heat rollers, it is pushed out to the outside. Therefore, air bubbles do not remain in the heat fusion layer and the like, and moreover, the adhesion between the films is further improved by the pressure between the heat rollers. By winding the film laminate having good adhesion as described above, a high-voltage film capacitor having stable characteristics and high reliability can be obtained.

[0009]

FIG. 2 is an exploded sectional view showing a laminated structure of a high voltage film capacitor according to an embodiment of the present invention. In FIG. 2, 12 and 15 are electrode forming films,
Electrodes 6 and 7 made of a vapor deposition film or foil of aluminum are provided on one surface of the dielectric films 8 and 9, respectively. Further, reference numerals 10, 11, 13, and 14 are heat-fusible films, and the heat-fusion layer 5 is formed on one side or both sides of the dielectric film 4.
Is equipped with. As shown in the figure, the heat-sealing layer 5 is always in contact with other films, especially the surfaces in contact with the electrodes 6 and 7.

FIG. 3 is an exploded perspective view showing only the film on which electrodes are formed in the high voltage film capacitor. As shown in FIG. 3, four electrodes 6a to 6d are provided on one surface of the dielectric film 8, three electrodes 7a to 7c are provided on one surface of the dielectric film 9, and the electrodes are staggered. Therefore, the dielectric film 8 and the interlayer dielectric (see FIG.
An electrostatic capacitance is formed between the electrodes via the heat-sealing films 13 and 14 in FIG. The lead terminals are drawn out from the respective ends of the electrodes 6a and 6d. As a result, a series circuit composed of six capacitors is formed between the two leads.

Next, the structure of a manufacturing apparatus for manufacturing a high voltage film capacitor using the film having the above structure is shown in FIG.
Shown in. In FIG. 1, 10 to 15 are the films shown in FIG. 2, which are laminated by passing them through a roller 3, and are passed between two heat rollers 2a and 2b to heat the entire laminated body and to perform pressure bonding. .. This allows
Each heat-sealing layer 5 shown in FIG. 2 is melted and the adjacent films are melt-bonded to each other. Subsequently, the laminated film integrally fused and wound is wound to obtain the wound element 1 of the high voltage film capacitor.

In the high-voltage film capacitor manufactured in this manner, no bubbles remain inside the laminate, and the adhesion between the films is good, so that a high-voltage film capacitor with stable characteristics and high reliability is obtained. can get.

A high-temperature load life test was conducted on a high-voltage film capacitor having the same structure manufactured by the conventional technique and a high-voltage film capacitor manufactured by the embodiment of the present invention. did.

[0014]

According to the method of manufacturing a high voltage film capacitor of the present invention, bubbles do not remain between the laminated films and the adhesion between the films becomes good, so that the characteristics are stable and the reliability is high. A high voltage film capacitor is obtained. Further, since the film laminate passed between the heat rollers may be wound as it is, the winding step and the heat fusion step can be continuously performed, and the productivity is improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an apparatus for manufacturing a high voltage film capacitor according to an embodiment of the present invention, FIG. 2 is an exploded sectional view showing a laminated structure of a high voltage film capacitor, and FIG. Is.

[Explanation of symbols]

 1-Rolling element of high voltage film capacitor 2a, 2b-Heat roller 3-Roller 4-Dielectric film 5-Heat fusion layer 6,7-Electrode 8,9-Dielectric film 10,11,13,14-Heat Fusing film 12,15-electrode forming film

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junji Shibano 2-10-10 Tenjin, Nagaokakyo-shi, Kyoto Murata Manufacturing Co., Ltd. (72) Inventor Toshiya Oshima 2-26-10 Tenjin, Nagaokakyo, Kyoto Murata Manufacturing (72) Inventor Makoto Kawamura 2-10-10 Tenjin, Nagaokakyo, Kyoto Prefecture Murata Manufacturing Co., Ltd. (72) Inventor Koichi Nitta 2-10-10 Tenjin, Nagaokakyo, Kyoto Murata Manufacturing Co., Ltd.

Claims (1)

Claim: What is claimed is: 1. An interlayer dielectric film having a heat-sealing layer formed on one surface or both surfaces thereof is laminated with a film having electrodes formed thereon, and the film is heat-sealed between the heat rollers. A method for manufacturing a high-voltage film capacitor, which comprises winding the fused and laminated film.