JPH03276609A - Dry type metallized film capacitor - Google Patents

Abstract

PURPOSE:To prevent restrike after the melting of a fuse part, by making the main component of a metal film in the vicinity of a part bonded with at least one side of spraying metal electrodes aluminum, making the main component of the metal film of the other part zinc, and intermittently forming blank parts in the aluminum metal film part. CONSTITUTION:The title capacitor is constituted of the following; an insulating film 1, a zinc deposition film 2, an aluminum deposition film 3, a zinc deposition film 4, a blank part (part where aluminum is eliminated) 5, a sprayed zinc electrode part 6, a fuse part 8, a division marine part 9, and a division electrode part 10. At least one side metallized film has a fuse part at the end portion, and the other metallized film part has no fuse part at the end portion. The fuse part may be formed on both end portions. By this constitution, insulative aluminum oxide (Al2O3) is formed when the fuse part is melted, so that restrike after the melting of a fuse can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dry metallized film capacitor used for starting electrical equipment, communication equipment, various power sources, etc. or for power factor improvement.

[Prior art] Dry metallized film capacitors have at least one pair of metal films on the surface of an insulating film, and are easy to use and durable because they do not use oil such as insulating oil. , - Used for boat fishing. In addition, the use of vapor-deposited metal electrodes has led to miniaturization.

The structure of a dry metallized film capacitor using conventional vapor-deposited metal electrodes is shown in FIGS. 4 and 5. 4 and 5, 1 is an insulating film, 4 is a zinc vapor deposited film, 6 is a sprayed zinc electrode part, 7 is a blank part (zinc removed part), 8
9 is a fuse portion, 9 is a divided margin portion, and 10 is a divided electrode portion.

A method of manufacturing a prior art metallized film capacitor having the above structure will now be described.

First, the metallized film shown on the upper side of FIGS. 4 and 5 is produced by forming a zinc evaporated film 4 on one side of an insulating film 1 such as a polypropylene film, and forming a blank part 7 and a dividing margin part 9 by laser processing or the like. The fuse part 8 and the divided electrode part ]-0 are formed. The reason for forming the blank section 7 is to form the fuse section 8. Next, in the metallized film shown on the lower side of FIGS. 4 and 5, the electrode is divided into a plurality of parts by the dividing margin part 9, but the blank part 7 and the fuse part 8 are not formed. That is, the upper metallized film has a fuse portion at the end, whereas the lower metallized film does not have a fuse portion at the end.

These pairs of metallized films are then wound in a laminated manner, and sprayed zinc electrodes 6 are formed at both ends of the laminated wound body.

[Problems to be Solved by the Invention] However, the structure of the prior art described above has a problem in that after the fuse is blown, the insulation durability decreases and re-ignition occurs. If a re-ignition occurs, the fuse or other electrical components may cause undesirable phenomena such as ignition. The above-mentioned restriking is thought to be due to the formation of semiconducting zinc oxide (ZnO) when the capacitor breaks down and the zinc in the fuse blows out.

SUMMARY OF THE INVENTION In order to solve the problems of the prior art described above, it is an object of the present invention to provide a dry metallized film capacitor in which the fuse section does not re-ignite after blowing out.

[Means for Solving the Problems] In order to achieve the above object, the dry metallized film capacitor of the present invention provides at least one pair of metal films on the surface of an insulating film, each metal film having one end coated with a separate sprayed metal. A dry metallized film capacitor bonded to an electrode, wherein the main component of the metal film in the vicinity of the metal film bonded to at least one of the sprayed metal electrodes is aluminum;
The main component of the metal film in other parts is zinc, and blank parts are provided intermittently in the parts of the metal film where the main component is aluminum.

[Function] According to the configuration of the present invention, the main component of the metal film in the vicinity of the metal film bonded to at least one of the sprayed metal electrodes is aluminum, and the main component of the metal film in other parts is zinc. In addition, by providing intermittently blank areas in the part of the metal film whose main component is aluminum, when the fuse blows out, aluminum oxide (Al203), which is an insulator, is formed, which prevents the fuse from blowing. Re-ignition can be prevented.

[Example] An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 show the structure of an embodiment of the present invention. 1 and 2, 1 is an insulating film, 2 is a zinc evaporated film, 3 is an aluminum evaporated film, 4 is a zinc evaporated film, 5 is a blank area (aluminum removed area), and 6 is a sprayed zinc electrode area (- 8 is a fuse part, 9 is a divided margin part, and 10 is a divided electrode part.

At least one metallized film (in this example, the upper metallized film) has a fuse portion at its end, while the other metallized film (in this example, the lower metalized film) has a fuse portion at its end. metallized film) does not have fuses at the ends. Note that the heat portions may be provided at both ends.

A method of manufacturing a metallized film capacitor according to an embodiment of the present invention having the above structure will be described below.

First, on one side of an insulating film 1 made of polypropylene film, polyethylene terephthalate, etc., a vapor-deposited film 3 whose main component is aluminum is formed in the vicinity of the metal film connected to at least one sprayed metal electrode, and the other parts are covered with the metal. A vapor deposited film 2 whose main component is zinc is formed. These deposited films of zinc and aluminum can be obtained by alternately depositing zinc and aluminum using a masking material. Next, using a laser, blank portions 5 are intermittently provided in the portions of the metal vapor deposited film 3 whose main component is aluminum. That is, the aluminum vapor deposited film is removed by laser irradiation. By intermittently providing blank portions 5 in parts of the vapor deposited film 3 whose main component is aluminum,
This is to create an insulator of aluminum oxide (AI 203) when the fuse blows out, and to prevent the fuse from igniting again after blowing out.

Next, the upper metallized film having the fuse portion at the end described above and the lower metallized film having no fuse portion at the end are made into a pair, and these pairs of metallized films are laminated. After winding, sprayed zinc electrodes 6 are formed on both ends of the laminated winding body.

As described above, a dry metallized film capacitor according to an embodiment of the present invention is obtained.

As a specific example, a polypropylene film with a thickness of 6 μm is used as the insulating film 1, and the film resistance of the zinc vapor deposited film 2.4 is 10 to 15 Ω/hole, and the film resistance of the aluminum vapor deposited film 3 is 4 to 6 Ω/hole. Each was vacuum evaporated. Next, as a dry safety mechanism, a blank part 5 and a divided margin part 9 were formed by laser processing, and a fuse part 8 and a divided electrode part 10 were formed. Then, the lengths of T, tl, and t2 shown in FIG. 2 are set as follows: T=60, t1=t2=1.
It was set to 5 mm. The product produced as described above was laminated and wound, and sprayed zinc electrodes 6 were further formed on both ends.

The capacitor obtained as described above had a voltage of 380 μF at a commercial wavenumber AC and a capacitance of 20 μF.

This capacitor was subjected to a safety test specified in J I 5-C-4908. The results are shown in Table 1.

For comparison, the conventional capacitors shown in FIGS. 4 and 5 were also measured.

As shown in Table 1, all 20 safety mechanisms operated in the capacitor according to the embodiment of the present invention.

On the other hand, in the conventional capacitors shown in FIGS. 4 and 5, the safety mechanism was activated in only 12 out of 20 capacitors. Analysis of this non-operating work revealed that all of the damage was due to re-ignition at fuse section 8.

In addition, in the capacitor according to this example, no decrease in capacity due to oxidation of aluminum was observed even after 500 hours of continuous energization.

In this example, polypropylene was used as an example of the insulating film, but polyethylene terephthalate, polycarbonate, polyphenylene sulfide, polyamide,
A film such as polyimide can be used.

Further, a similar effect can be achieved in a capacitor having a double-sided vapor deposition structure shown in FIG.

Furthermore, the part of the metal vapor deposited film 3 made of aluminum is
The film thickness may be thicker than that of the zinc vapor deposited film 2.

Further, in the above embodiment, an example was shown in which only one electrode was provided with the metal vapor deposited film 3 made of aluminum, but it goes without saying that both electrodes may be provided with the metal vapor deposited film 3 made of aluminum.

[Effects of the Invention] As explained above, according to the present invention, among the metal films,
The main component of the metal film in the vicinity of bonding with at least one of the sprayed metal electrodes is aluminum, the main component of the other parts of the metal film is zinc, and the main component is intermittent in the part of the metal film where the main component is aluminum. Since a blank space is provided between the fuse and the fuse, it is possible to achieve the excellent effect of preventing re-ignition after the fuse melts.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of a metallized film capacitor with a dry safety mechanism according to an embodiment of the present invention, FIG. 2 is a perspective view of the metallized film capacitor before laminated winding, and FIG. FIG. 4 is a schematic sectional view of a conventional metallized film capacitor, and FIG. 5 is a perspective view of the same before lamination and winding. 1... Insulating film, 2... Zinc vapor deposited film, 3...
Aluminum vapor deposited film, 4... Zinc vapor deposited film, 5... Blank part (aluminum removed part), 6... Sprayed zinc electrode part, 7... Blank part (zinc removed part), 8... Fuse part, 9... divided margin part, 10... divided electrode part.

Claims (1)

[Claims] (1) A dry metallized film capacitor in which at least one pair of metal films is provided on the surface of an insulating film, and each metal film is connected to a separate sprayed metal electrode at one end, wherein at least one of the metal films is sprayed. The main component of the metal film in the vicinity of the contact with the metal electrode is aluminum, the main component of the other part of the metal film is zinc, and there are intermittently blank spaces in the parts of the metal film where the main component is aluminum. A dry metallized film capacitor characterized by having: