JPH0334511A - Manufacture of film capacitor - Google Patents

Abstract

PURPOSE:To obtain a plurality of capacitor elements while one sheet or one pair of wide-width raw-material films are being rolled up by a method wherein a wide-width metallized organic material on which a non-metallized organic material has been piled up is rolled up while it is being slit at an interval, in a width direction, which corresponding to an interval of one capacitor, an electrode extraction end-face is brought into contact with a gas which is reactive with an organic material, the end face is removed chemically and an end-face electrode is formed. CONSTITUTION:Margins (non-metallized parts) are formed in a wide-width one-face-metallized film 1 at an interval each corresponding to one capacitor element. While the side of the margins is being slit by using slit blades 2 at an interval each corresponding to one capacitor element 4, it is rolled up. Electrode extraction end-face side parts of rolled-up elements 4, 7 are removed chemically and selectively from directions 8, 9. At the chemically and selectively removed film (organic material), vapor-deposited aluminum 11 is not removed and is set to an exposed state. When end-face electrodes are formed at the end faces, one capacitor can be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing capacitors used in electronic and electrical equipment, particularly metallized film capacitors.

2. Description of the Related Art 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.

An example of a conventional film capacitor manufacturing method will be described below with reference to the drawings.

FIG. 6 shows a typical method of forming a conventional wound film capacitor element.

In the figure, 19 and 2O are both single-sided metallized films. By simultaneously winding 19 and 2O (21), a wound film capacitor element 22 is completed.

Conventionally, in order to form electrode metal on the end face of the wound film capacitor element 22, the width direction of the film (currently at least 0
．． The wires were wound with alternating shifts of about 2M), and a gap was provided on the end face where the end face electrode was to be formed. In addition, in order to alternately shift the film capacitor element, as shown in FIG.
A pair of original fabrics was required.

Problems to be Solved by the Invention However, with the above-mentioned configuration, it is difficult to
It is necessary to accurately slit the width of one capacitor element as shown in 19.2O, and it is also necessary to perform staggered winding with accuracy as shown in FIG.

With this method, it is necessary to slit a wide raw material into narrow widths, the equipment cost is high, high precision is required for winding, and the film capacitor is made smaller due to staggered winding. There were some problems, such as difficulty.

In view of the above-mentioned problems with the conventional methods, the present invention provides a method for forming a wound or laminated film capacitor in which dielectrics made of organic materials and electrodes are stacked alternately in multiple layers. While winding up the original fabric, or 1
A plurality of capacitor elements are provided by winding up pairs of wide original fabrics.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a single wide sheet of metallized organic material, or two sheets of non-metallized organic material at the same time, or two sheets of wide metallized organic material. Two sheets of metallized organic material are stacked and rolled up while slitting them at widthwise intervals equivalent to one capacitor to form multiple wound or laminated film capacitors. The end electrodes are formed by bringing the material into contact with a highly reactive gas and chemically selectively removing the end surface side portions of each material.

Function: By this manufacturing method, it is possible to form a plurality of film capacitors from a wide raw material, and it is possible to wind with high accuracy without the need for staggered winding, and to obtain sufficient adhesion strength of the end electrodes.

EXAMPLES Hereinafter, the film capacitor of the present invention and its manufacturing method will be explained based on examples.

Embodiment 1 FIG. 1 fa) shows the winding part of the manufacturing process of a wound film capacitor according to the first embodiment of the present invention.

In the figure, 1 is a metalized film on one side, 2 is a slitting blade, 3 is a winding section, and 4 is a winding film capacitor element.

In this embodiment, a wide single-sided metallized film 1 has margins (non-metalized parts) formed at intervals of one capacitor element, and the sides of the margins are cut by a slit blade 2 at intervals of 41 capacitor elements. Wind it up while slitting it.

In addition, Fig. 1 (bl shows a wide single-sided metallized film l laminated and wound around a flat bobbin 6. In Fig. 1 tb+, as in Fig. 1 The film 1 has margins formed at intervals of 71 capacitor elements, and is rolled up while slitting the margins by a slit blade 2 at intervals of 71 capacitor elements.

At this time, the margins in Figure 1 (a) and (bl) are
As shown in FIG. 3(a), the positions are switched layer by layer to form opposing portions (portions contributing to capacitance).

The capacitor element 4.7 wound by fat and (bl in FIG. 1) is shown in the direction of the arrow 8.9 in FIG.
The end surface side portion of the electrode is selectively removed chemically. This selective removal is shown in FIG.

FIG. 3(a) shows an interlayer cross section of the above-mentioned wound or laminated capacitor elements 4 and 7. Here, 10 is a film (organic material), 11 is evaporated aluminum (metalized part),
12 indicates a margin (non-metalized part). , this Figure 3 f
A capacitor element having the structure shown at is shown in Fig. 3 (
As shown in bl, only the film (organic material) is selectively removed chemically.

Here, 13 is a film (organic material) that has been selectively removed chemically, and the vapor-deposited aluminum 11 (metalized portion) is not removed and is exposed.

When an end face electrode is formed on the chemically selectively removed end face, it becomes as shown in FIG. 3 (C1). 14 is a sprayed brass particle, and one capacitor is completed.

In addition, as a chemical selective removal method for the above organic materials,
An oxygen plasma treatment device is used. By using this oxygen plasma treatment device, the end face of the electrode (al) where the electrode is to be drawn out is brought into contact with oxygen gas plasma, and only the organic material on the side of the end face where the electrode is drawn out is chemically selected, as shown in figure 3 (bl). remove target.

The etching conditions using this oxygen plasma processing apparatus were an oxygen flow rate of 608 CCM, a pressure of 1, Q Torr, and a high frequency power of 400 W.

The blade for removing organic film using oxygen plasma, the oxygen radicals in the oxygen plasma attack the bonds such as C-C, C-H, and C-8 in the organic film, and the organic matter becomes CO2, H2.
This is done by turning into gases such as O and SO2 and exhausting them.

In addition, if the film on the end face electrode side of the rolled or laminated body of metallized film is chemically removed by the above method, non-metallic parts of the metalized film that have minute gaps during winding or lamination can be removed. Since the metallized side is removed preferentially than the metallized side, it is expected that the end face of each film will be processed into a tapered shape.

Example 2 Next, a second embodiment of the present invention will be described.

FIG. 4 shows a winding section in the manufacturing process of a wound type film capacitor according to a second embodiment of the present invention.

In the figure, both 15 and 16 are single-sided metalized films or a combination of double-sided metalized films and non-metalized films.

Here, the case where both 15 and 16 are metalized films on one side will be explained. Both single-sided metallized films 15 and 16 have margins (non-metalized parts) formed at intervals of one capacitor element, and while slitting the side of the margin at intervals of one capacitor element with a slit blade 2, Stack the sheets and roll them up.

The capacitor element 17 wound up as shown in FIG. 4 is chemically and selectively removed from the end surface side portion where the electrodes are drawn out, as in the first embodiment. Furthermore, the state of this selective removal is also as shown in FIGS.
The oxygen plasma treatment, which is a chemical selective removal method for organic materials, is also the same as in Example 1.

Similar to Example 1, according to this method, it is possible to obtain a plurality of capacitor elements wound with high precision from a wide original fabric.

The manufacturing method of the above capacitor is shown in 1 in Fig. 4.
The same applies even if 5 and 16 are a combination of a double-sided metallized film and a non-metalized film.

Further, the above method for manufacturing a capacitor is also applicable to the manufacturing process for a laminated film capacitor as shown in FIG.

Effects of the Invention As described above, the present invention involves forming a film capacitor element by accurately winding a film capacitor element from a wide raw material while slitting it to the width of one capacitor element, and then coating the end face of the electrode with an organic material. The dielectric is brought into contact with a gas containing at least a reactive gas, and the portion of the dielectric on the side of the electrode lead-out end surface is chemically and selectively removed to expose the electrode from the end surface, thereby establishing good electrical connection between the electrode and the end surface electrode. It is possible to obtain sufficient contact and adhesion strength of the end electrodes, and to mass-produce wound-type or laminated-type film capacitors with excellent characteristics.

[Brief explanation of drawings]

FIGS. 1(al) and (b) are diagrams showing the main parts of the process for manufacturing a wound type and laminated film capacitor in the first embodiment of the present invention, and FIG. Figure 3 is a cross-sectional view of a capacitor element showing the selective chemical removal of the electrode lead-out end face side of the dielectric of a capacitor element. The diagram shown, Figure 4, shows two metallized films or one metallized film and one metallized film.
Figure 5 shows the process of manufacturing a wound film capacitor by slitting sheets of non-metalized film to the width of one capacitor and rolling them up while stacking them. FIG. 6 is a diagram showing a typical manufacturing process of a conventional wound film capacitor. DESCRIPTION OF SYMBOLS 1...Metalized film, 2...Slit blade, 3...Wound type winding part, 4...Wound film capacitor element, 5... . . . Laminated winding section, 6 . . . Flat bobbin, 7 . . . Laminated film capacitor element.

Claims (8)

[Claims] (1) One sheet of wide metallized organic material is rolled up, or two sheets are simultaneously slit while being overlapped with a non-metalized organic material at intervals corresponding to one capacitor in the width direction; A step of forming a laminate or a wound product comprising a plurality of electrodes and at least one layer of dielectric material between the electrodes, and forming an electrode lead-out end surface with aligned end surfaces of the laminate or the wound material using an organic material. manufacturing a film capacitor, comprising the step of contacting with a gas containing at least a reactive gas and chemically removing the electrode extension end face side portion of the dielectric, and then forming an end face electrode. Method. (2) Two sheets of wide metallized organic material are simultaneously rolled up while being slit at intervals corresponding to one capacitor in the width direction, and a plurality of electrodes are formed, and at least one layer is formed between the electrodes. a step of forming a laminate or a winding that forms a dielectric, and contacting an electrode lead-out end face of the laminate or winding, the end faces of which are aligned, with a gas containing at least a gas reactive with an organic material; A method for manufacturing a film capacitor, comprising the step of: forming an end electrode after chemically removing the electrode extension end surface side portion of the dielectric. (3) The method for manufacturing a film capacitor according to Claims 1 and 2, characterized in that the portion on the side of the electrode extension end face of the dielectric is chemically and selectively removed using plasma containing at least oxygen. (4) Claims 1 and 2 characterized in that the electrode extension end face side portion of the dielectric is chemically and selectively removed using plasma containing an oxygen-containing gas added with at least one of CF_4, SF_6, and N_2O. The method of manufacturing the film capacitor described. (5) The method for manufacturing a film capacitor according to Claims 1 and 2, characterized in that the portion on the side of the electrode extension end face of the dielectric is chemically and selectively removed using oxygen radicals extracted from plasma containing at least oxygen. (6) The method for manufacturing a film capacitor according to Claims 1 and 2, characterized in that the portion of the dielectric on the side of the electrode extension end surface is chemically and selectively removed using a gas containing at least ozone. (7) The method for manufacturing a film capacitor according to Claims 1 and 2, characterized in that the portion on the side of the electrode extension end face of the dielectric is chemically and selectively removed using a gas containing at least ozone with N_2O added thereto. (8) The method for manufacturing a film capacitor according to Claims 1 and 2, characterized in that the portion of the dielectric on the side of the electrode extension end surface is chemically and selectively removed using gas plasma containing at least oxygen or hydrogen.