JPS5867017A - Method of producing metallized film condenser - 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 a method for manufacturing a metallized film capacitor, which is constructed by winding or laminating a metallized film in which a metal electrode is formed by vapor deposition or the like on the surface of a dielectric film. .

Conventionally, metallized film capacitors have been manufactured by the method described below. First, as shown in FIG. 1, aluminum 1. A double-sided metallized film is obtained by forming a metal electrode 2 made of zinc or the like by providing a non-metalized portion 3 of about 111M to 5M on the widthwise end of the dielectric film 1, and then forming the metalized film. After applying a dielectric layer 4 of polycarbonate, acetyl cellulose, etc. to both sides of the element, this is wound, and then zinc or tin is applied to both end faces of the wound element.

A metal material such as copper or lead is thermally sprayed to form an electrode lead-out part 5, and a lead wire 6 is connected to the electrode lead-out part 6 by welding or the like to obtain a capacitor element, and a suitable exterior is applied to the capacitor element. The capacitor is obtained by this.

In addition to these wound-type capacitors, many multilayer capacitors are also produced, and in this case, they are often manufactured by winding them around a bobbin and then cutting them, but the basic structure is is the same as the habo-waki type.

By the way, in the metallized film capacitor manufactured in this way, the non-metalized portion 3 is used for the purpose of preventing the metal electrode 2 from coming into contact with the electrode extension part 6 on the opposite side when the electrode extension part 6 is formed. shall be established;
This non-metalized portion 3 needs to have insulating properties that can withstand the voltage applied when the capacitor is used. Due to this requirement for insulation, in conventional film capacitors, even those with low rated voltages, the width of the non-metallic portion is generally about 1Ω.

However, this non-metalized portion 3 does not contribute to the capacitance of the capacitor at all and is a loss portion. Therefore, the width of the metal electrode 2 that contributes to the capacitance, that is, the width of the non-metallic part 3, is not a very important issue, but the width of the non-metallic part 3 is not a very important issue. The shape becomes an important issue.

The present invention was made in view of the current situation, and by improving and improving the problems of the non-metalized part, the width of the non-metalized part is narrowed, thereby improving productivity and reducing costs. The purpose is to achieve this goal.

By the way, the formation of the non-metal evaporated portion as the non-metalized portion is achieved by continuously performing metal evaporation on the evaporation substrate during the evaporation process, and while creating the non-metal evaporation portion in the necessary areas, the evaporation process is continued. There is a need to proceed. .

To address this need, there are known tape mask methods in which the necessary portions as non-metal vapor deposition portions are covered with tape and oil mask methods in which oil is applied to the necessary portions.

However, in the tape mask method, the heat-resistant tape is moved to cover the required area, and the vapor-deposited metal is attached to the heat-resistant tape to obtain the required area, so the width of the tape is To withstand mechanical strength,
Generally, 2 MIN or more is required, and since the tape is moving, the accuracy of the non-metal evaporated part is also +: o, s *
*To some extent, it is difficult to form a non-metal evaporated part with an extremely narrow width of less than 1 inch using the tape method.

On the other hand, the oil mask method is a method that takes advantage of the fact that when performing metal vapor deposition, if oil is applied to the non-metal vapor deposition area in advance, the deposited metal vapor cannot form a film. With this method, it is possible to form a non-metal vapor deposited part with an extremely narrow width of 1 mm or less. However, during deposition,
In order to obtain a clear non-metal deposited area, a large amount of oil must be applied.

This residual oil impairs running performance when winding up the capacitor, causing meandering and bumps. Further, due to residual oil adhering to the end of the metallized film, the connection with the electrode extension part 5 becomes incomplete, resulting in a tan δ defect. For this reason, the oil mask method is not generally adopted at present.

The present invention was made with the aim of solving the problems of this oil mask method, and provides a manufacturing method that is capable of forming a non-metal vapor deposited part with an extremely narrow width (1 width or less) and is not affected by residual oil. It is something to do. Hereinafter, it will be explained in more detail based on specific examples.

On the polyethylene terephthalate film 7 having a thickness of 3.6 μm, aluminum was vacuum-deposited to a thickness of 300 to 500 Å using a vacuum evaporator shown in FIG. At this time, the polyethylene terephthalate film 7 is unwound from the take-up shaft 8 and fed sequentially through rollers, and after the insulating oil deposited from the oil pot 9 is attached to a thickness of 200 mm to 3000 mm. The aluminum evaporated from the vapor deposition source 11 is vapor-deposited while being cooled from the back side by the cooling can 1Q, and then the opposite side is vapor-deposited through the same process and then wound onto the take-up shaft 12.

In this way, polyethylene terephthalate film 7
As shown in Figure 3, 0.1 #1 with a pitch of 15MM is used.
A metal electrode 14 of aluminum provided with a non-metallized portion 13 of width III is formed. This non-metalized portion 13
In this case, an insulating residual oil 15 remained with a thickness of 1001 to 2000 µm.6 Note that in order to obtain a clear undeposited non-metalized part 13, an amount of residual oil of 100 Å or more is required. This is clearly shown by experiments.

Next, as shown in Figure 4, polycarbonate resin dissolved in a mixed solvent of dichloroethane and dichloromethane is applied to both sides of the metallized film and dried to form a 1μ
A dielectric layer 16 having a thickness of m is formed. In this case, it is better to provide a non-applied part 17 in order to improve the connection with the electrode extension part.

Further, the residual oil 15 on the non-metalized portion 13 is sealed by the applied dielectric layer 16.

Note that when the amount of residual oil 16 becomes 2000 μm or more, the thickness of the dielectric layer 16 becomes uneven and the adhesion between the metallized film and the applied dielectric layer 16 deteriorates. Therefore, by cutting the residual oil 16 at the dotted line position in FIG. 4, a double-sided metallized film having a width as shown in FIG. 5 can be obtained. The double-sided metallized film obtained in this way was wound and heated at 90°C11s kg/
After press aging for 10 minutes at a pressure of 2 m2, zinc was sprayed on both end faces of the element to form the electrode lead-out part 1, as shown in Figure 6.
After soldering the lead wire 19 to the electrode extension part 18, the capacitor was covered with epoxy resin by the tip method to obtain a 0.1 μF capacitor.

The problems of runnability such as meandering and wrinkles during winding due to residual oil, which have conventionally been a problem with the oil mask method, are also eliminated because the residual oil 15 is contained by the dielectric layer 16, As long as the residual oil 15 is not attached to the end of the metallized film, the connection with the electrode extension part 18 is strong, and characteristics comparable to those of the tape merge y method can be obtained. Moreover, the width of the non-metalized portion 12 can be reduced from the conventional 1fl to 0.1mm, thereby making it possible to widen the effective electrode facing width.
Significant downsizing can be achieved.

In addition, although the case where a double-sided metalized film was used was described in the above example, the same effect can be obtained when a single-sided metalized film is used. Also, a laminated type capacitor rather than a wound type capacitor has the same effect.

As described above, according to the method for manufacturing a metallized film capacitor of the present invention, meandering during winding due to residual oil occurs when an oil mask method is used.

In addition to eliminating runnability problems such as wrinkles, it is possible to strengthen the connection between the metal electrode of the metallized film and the electrode extension part, and to narrow the width of the non-metalized part of the metallized film. By being able to do this, the effective electrode facing width can be increased, and the size can be significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the schematic structure of a conventional metallized film capacitor, and FIG. 2 is a vacuum evaporation machine used for manufacturing a metallized film in the method for manufacturing a metallized film capacitor according to the present invention. A schematic configuration diagram showing an example, and FIGS. 3 to 6 are cross-sectional views showing main steps in a method for manufacturing a metallized film capacitor according to an embodiment of the present invention, and FIG. It is a sectional view showing an example of a schematic structure of a metalized film capacitor. 7...Polyethylene terephthalate film,
13...? :...-Nonmetalized part, 14...Metal electrode, 16...Residual oil, 16...
・Dielectric layer. Name of agent: Patent attorney Toshio Nakao and 1 other person 1st
Figure 2 Figure 3 Figure 4! 6 no5 5th
figure

Claims (3)

[Claims] (1) When a metallized film is obtained by forming a non-metalized portion using an oil mask method, a dielectric layer is provided on the metal electrode of the metallized film to remove residual oil from the formation of the non-metalized portion of the metallized film. A method of manufacturing a metallized film capacitor that is encapsulated by (2) The method for manufacturing a metallized film capacitor according to claim 1, wherein the width of the non-metalized portion is 0.1 to I MM. (3) The method for manufacturing a metallized film capacitor according to claim 1, wherein the thickness of the residual oil in the non-metalized portion is in the range of 100 µm to 200 OA.