JPH0379013A - Manufacture of film capacitor - Google Patents

Abstract

PURPOSE:To obtain an accurate and excellent slit terminal by using a slit blade with both ends held at the time of cutting a laminated or wound metallized film having a plurality of capacitor width into one having a single capacitor width. CONSTITUTION:By using a slit blade 4 with both ends held, a laminated or wound metallized film 2 or 9 having a plurality of capacitor width is cut into one having single capacitor width. ln this case when the film capacitors are to be cut, uniform slit ends can be accurately obtained without deforming the slit blade. Thus entering of sprayed metal into the slit end face is secure while both the mechanical strength and electrical characteristics can be good thereby enabling further reduction in size of the film capacitor.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a film capacitor.

[Conventional technology]

In recent years, efforts have been made to make electronic devices and electrical devices more multifunctional and smaller, and the film capacitors used in these devices are also required to be smaller. Therefore, it is necessary to enlarge the area of the portion contributing to the capacitance and to form the end face of the electric scraping part with high precision.

Hereinafter, a method for manufacturing the conventional film capacitor as described above will be explained based on FIGS. 3 and 4(a).

FIG. 3 shows a single-sided metallized film 8 having a plurality of capacitor widths with a plurality of margins (non-metalized portions) 1 wound up on a flat take-up bobbin 10, and then glued between the eyebrows using a heat press to form a flat plate. This figure shows that the laminated metallized film 2 is formed by separating it from the take-up bobbin 10.

FIG. 4(a) shows how the laminated metallized film 2 is slit into a single capacitor width.

As shown in FIG. 4(a), the laminated metallized film 2 is slit by moving the slit blade 13 of the holder 11 in the direction of arrow B along the margin 1 of the laminated metallized film 2. The guide 12 shown in FIG. 4(b) is used to prevent the slit blade 13 protruding from the top surface of the workpiece from being significantly deformed (waviness due to slitting resistance, etc.) during slitting, and is provided in the direction in which the slit blade 13 moves. It is set in.

Conventionally, such a method has been used to slit a laminated metallized film with multiple capacitor widths into a single capacitor width, and after this slitting, the laminated metallized film is thermally sprayed with metal on the slit end face. The electrode was formed by

[Problem to be solved by the invention]

However, in this conventional method, even if there is a guide 12 for the slit blade 13 as shown in FIG.
No. 3 has the problem that it succumbs to the slitting resistance of the workpiece and causes deformation during slinting. As a result, Figure 4 (
As shown in C), the slit end surface 14 is connected to the slit blade 1.
Waviness occurred due to the deformation of the slit blade 13, and the deformed slit blade 13 in the slit damaged the film at the end face of the slit.

Furthermore, the width of the single slit capacitor was non-uniform. For this reason, the sprayed metal (not shown) for forming the electrode cannot sufficiently penetrate between the laminated films on the slit end surface 14.
The electrical contact between No. 4 and the sprayed metal was also insufficient, resulting in unstable mechanical strength and electrical properties. Also the fourth
As shown in Figure (C), when undulations occur on the slit end face 14, the dimensional accuracy decreases and it is necessary to increase the area of the electrode extension portion, which hinders miniaturization of the film capacitor.

In view of the above-mentioned problems, this invention enables the slitting of laminated or wound metallized films of multiple capacitor widths into a single capacitor width without deforming the slitting blade, and therefore enables uniform slit end surfaces to be formed with high accuracy. The present invention provides a method for manufacturing a film capacitor that can be obtained.

(Means for Solving the Problems) The method for manufacturing a film capacitor of the present invention involves slitting laminated or wound metallized films of multiple capacitor widths into a single capacitor width using a slitting blade held at both ends. It is characterized by

[Effect]

With this invention, when slitting a film capacitor, it is possible to obtain a uniform slit end face with high precision without deforming the slit blade, thereby ensuring the penetration of the sprayed metal into the slit end face, thereby improving mechanical strength. Both electrical characteristics become better, and further miniaturization of the film capacitor becomes possible.

(Example〕 A first embodiment of this invention will be described based on FIG.

FIGS. 1(a) and 1(b) show a slitting process in a method for manufacturing a multilayer film capacitor. 1 is a margin (non-metalized part), 2 is a laminated metallized film laminated to the width of a plurality of capacitors, 3 is a slit holder, and 4 is a slit blade such as a razor blade.

Figure 1(C) shows the slit width (
FIG. 2 is an enlarged view of a post-slit strip element 5 of a laminated metallized film 2 slit with a single capacitor width S; 6 is
The metallized portion of the metallized film is Al-deposited metal, and 7 indicates the end face of the slit.

As shown in FIG. 1(a), the slit blade 4 is firmly held at both ends by the holder 3, and is moved along the margin 1 of the laminated metallized film 2 together with the holder 3 in the six directions of the arrows. The metallized film 2 is slit. When slitting is performed in this manner, the slitting blade 4 slits the laminated metallized film 2 without being deformed (despite the resistance of the workpiece). A slit end surface 7 with no scratches and a uniform width can be obtained. Here, the slit end surface 7 is exposed to a gas containing at least a component reactive with an organic material (here, a film). It is treated to selectively remove only the material and facilitate the penetration of sprayed metal.

Therefore, the slit end surface 7 obtained by the above method is
The entire end face is chemically treated uniformly (only organic materials are selectively removed), and good penetration of the sprayed metal can be obtained.

As shown in FIG. 3, the laminated metallized film 2 is produced by laminating and winding a plurality of single-sided metallized films 8 having margins 1 and having a plurality of capacitor widths on a flat winding bobbin lO, and then using a heat breather to separate the layers. A second embodiment of the present invention will be described with reference to FIG. 2, which is obtained by adhering and separating from the bobbin 10.

FIG. 2 shows the winding and winding process used in this example.

In FIG. 2, the rolled metallized film 9 has a margin 1
Two single-sided metallized films 8 having a plurality of capacitor widths are superimposed and wound.

Here, the two single-sided metallized films 8 are wound up with the margins 1 shifted, and opposing parts (parts that contribute to capacitance) are formed within a single capacitor width.

This rolled metallized film 9 is then slit into a width S for one capacitor by a pick-and-thread blade 4 held at both ends by a holder 3 shown in FIG. 1(a).

By being slit with the slit blade 4 held at both ends, the slit end face of the rolled metallized film 9 becomes
It is possible to obtain a good condition with no scratches or undulations. Furthermore, the end face of this slit is made of organic material (film here).
The organic material is selectively removed by contacting it with a gas containing at least a component that is reactive with the organic material, thereby facilitating the penetration of the sprayed metal.

〔Effect of the invention〕

According to the method of the present invention, a slitting blade held at both ends is used when slitting laminated or wound metallized films of multiple capacitor widths into a single capacitor width.
Accurate and good slit end faces can be obtained. therefore,
Since the sprayed metal can be reliably penetrated into the slit end face, sufficient mechanical strength can be obtained, and sufficient electrical contact with the electrode metal can also be obtained. Since the slits can be made with high precision, the size can be reduced, and the practical effects thereof are great.

[Brief explanation of drawings]

FIG. 1(a) is a perspective view showing the slitting process of the method for manufacturing a multilayer film capacitor in the first embodiment of the present invention, FIG. 1(b) is a front view thereof, and FIG. 1(C) is a first An enlarged perspective view of a capacitor element slit by the method shown in FIG. 4(a) is a perspective view showing the conventional slitting method; FIG. 4(b) is a front view thereof;
FIG. 4(C) is an enlarged perspective view of a capacitor element slit by the conventional slitting method shown in FIG. 4(a). DESCRIPTION OF SYMBOLS 1... Margin (non-metalized part), 2... Laminated metallized film, 3... Holder, 4... Slit blade, 5...
...Slit post-dyeing element, 6...Al vapor-deposited metal, 7...
・Slit end face, 9...Wound metallized film Figure 2 Figure 3 Figure 1 (C) A/ 72- Figure

Claims (1)

[Claims] A method for manufacturing a film capacitor, which comprises slitting a laminated or wound metallized film having multiple capacitor widths into a single capacitor width using a slitting blade held at both ends.