JPH04239713A - Film capacitor and its manufacture - Google Patents

Abstract

PURPOSE:To provide a film capacitor, where the selectivity of margin pattern is high and which is excellent in safety function, and its manufacture by solving the issue such as the meandering of margin, production loss, etc., which were occurring in the conventional manufacture, in a film capacitor used for electric and electronic apparatus. CONSTITUTION:This a film capacitor, which uses a metallized film where a metallic film layer 8 is made at the surface of a high polymer film 1, and this consists of margins 2a and 7a continuous in the longitudinal direction of the high polymer film, discontinuous margins 4a and 5a, and margins 3a and 6a discontinuous in the width direction of the high polymer film, and in each space between several margins 4a and 5a discontinuous in the longitudinal direction of the high polymer film is provided a fuse 9.

Description

Description: FIELD OF INDUSTRIAL APPLICATION The present invention relates to a film capacitor used as a circuit element in an electric circuit or an electronic circuit of electric equipment or electronic equipment, and a method for manufacturing the same. 2. Description of the Related Art In recent years, electrical equipment and electronic equipment have made remarkable progress, and their role in industry has become increasingly important. Furthermore, as the electrical equipment and electronic equipment industries develop, fierce competition is taking place. With the development of high-performance, high-safety, and low-cost equipment, the electronic components used in the electric circuits and electronic circuits that make up these devices are also becoming more and more high-performance, highly reliable, highly safe, and low-cost. is required. Film capacitors, which are an electronic component, are similarly required to have high performance and low cost. Film capacitors that have been proposed so far include foil electrode types that use a polymer film for the dielectric and metal foil for the electrodes, and foil electrode types that use a vacuum evaporation method to form a metal thin film layer on the surface of the polymer film. There is also a vapor-deposited electrode type. Next, a conventional vapor-deposited electrode type film capacitor will be explained with reference to the drawings. A vapor-deposited electrode type film capacitor usually has an electrode 1 made of a metal thin film layer formed on the surface of a polymer film 12, as shown in FIG.
3 and another electrode 14 as opposed electrodes, the electrode 13 is brought into contact with the external electrode 15, and the other electrode 14 is brought into contact with the other external electrode 1.
6 to form a capacitor element. Therefore, a margin 17 or 18 is provided between the electrode 13 and the other external electrode 16, and between the other electrode 14 and the external electrode 15, so that contact between the electrode 13 and the other external electrode 16, and between the other electrode 14 and the external electrode 15 is established. It is configured so that there is no FIG. 6 shows an example of conventional margin formation. When forming an electrode 13 or 14 made of a metal thin film layer continuously on the surface of a wide and long polymer film 12 by vacuum evaporation or the like, a layer of metal is applied to the surface of the polymer film 12 immediately before the electrode 13 or 14 is formed. Margin 1 is the area where the metal thin film layer is not formed by applying oil vapor to a certain width at certain intervals.
7 or 18. Another method for providing the margins 17 and 18 during the formation of the metal thin film layer is to use margin tape, and also to provide the margins 17 and 18 after forming the metal thin film layer.
A method using laser etching has also been proposed as a method for providing the holes 7 and 18. [0005] However, in the conventional method of forming the margins 17 and 18 as described above, the electrodes 13 and 14 are damaged due to the scattering of oil vapor used for forming the margins.
If the margin tape is used, the meandering of the margins 17 and 18 or the electrodes 13 or 14 of the metal thin film layer may be affected.
Production losses may occur due to the margin tape breaking during formation. In addition, in the method of providing margins 17 and 18 during the formation of these metal thin film layers, margins 17 and 18 are provided in the width direction of the film, and margins 17 and 18 are provided in the width direction of the film.
It was technically extremely difficult to provide 7 and 18 discontinuously. On the other hand, a technique for creating margins 17 and 18 using a laser beam has been developed in recent years, but this method can be used to create horizontal margins of arbitrary width, discontinuous margins, etc. of 5 to 10 m.
There have been problems in that it is currently extremely difficult to provide a margin as wide as 1.0 m, and that thermal damage is caused to the polymer film 12 when laser etching the metal thin film layer. [0006] The present invention solves the above problems,
Metals with margins formed using a method that improves the method of creating margins during the formation of metal thin film layers, allows for arbitrary margin designs, and allows for easy creation of all types of margins, including longitudinal, widthwise, continuous, and discontinuous margins. The purpose of the present invention is to provide a film capacitor using a chemical film and a method for manufacturing the same. [Means for Solving the Problems] In order to achieve the above object, the metallized film with a margin used in the film capacitor of the present invention applies printing technology to form the margin, and uses water-soluble ink in the metallized film. Using printing technology, print patterns in the longitudinal direction, width direction, continuous, discontinuous, etc. are printed in advance on the surface of the polymer film before the metal thin film layer is formed using the material, and then a metal thin film layer is formed on the printed surface using a vacuum deposition method. After that, the water-soluble ink and the metal thin film layer on the surface of the water-soluble ink are removed by washing with water to form a margin and a fuse portion. Therefore, according to the structure of the present invention, it is possible to reduce the loss that occurs when providing a margin during the formation of a metal thin film layer and the factors that degrade the performance of a film capacitor due to damage to the polymer film. By applying the high selectivity of the margin pattern, the performance of film capacitors can be improved, and a high-precision fuse section can be provided, which enhances safety functions and improves the safety of film capacitors. be able to. [Embodiment] An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 are a sectional view (a) and a partial plan view (b), respectively, showing an outline of a method for manufacturing a film capacitor in an embodiment of the present invention. In the figure, 1 is a polymer film, 2, 3
, 4, 5, 6 and 7 are margin parts 2a, 3a, 4a
, 5a, 6a and 7a are printed films of water-soluble ink, 8 is a printed film of water-soluble ink 2, 3, 4,
This is a metal thin film layer consisting of an aluminum thin film layer formed on the polymer film 1 other than those coated with 5, 6 and 7.

Next, the manufacturing method will be explained. As shown in FIG. 1, printing is performed on the surface of a polymer film 1 using a water-soluble ink containing polyvinyl alcohol mixed with fine powder of calcium carbonate to form margins 2a, 3a, 4a, 5a, 6a, and 7a. Apply membranes 2, 3, 4, 5, 6 and 7. In addition, A shown in FIG. 1 shows the width direction of the polymer film 1, and B shows the same longitudinal direction. [0012] Here, to explain in more detail the printing pattern of the water-soluble ink applied on the polymer film 1, the printing pattern of the water-soluble ink applied on the polymer film 1 is sequentially printed in the width direction of the surface of the polymer film 1.
There is a printed film 2 that is continuous in the longitudinal direction with a width of 0.5 mm, and a fuse part 9 of 0.5 mm in width and a length of 0.5 mm in the longitudinal direction is located 25 mm from the printed film 2 in the middle part. There is a printed film 4 provided on. Between the printed film 2 and the printed film 4, there is a printed film 3 having a width of 0.5 mm. The intersection between the printed film 3 and the printed film 4 is at the center of the printed film 4. Further, at a position 20 mm in the width direction from the printing film 4, the width is 0.5 mm and the length is 0.5 mm every 30.9 mm in the longitudinal direction.
There is a printed membrane 5 provided with a 5 mm fuse portion 9. A printed film 7 having a width of 5 mm and continuous in the longitudinal direction is located 25 mm from the printed film 5 in the width direction, and a printed film 6 having a width of 0.5 mm is provided between the printed films 7 and 5. The intersection between the printed films 6 and 5 is the central portion of the printed films 5. The water-soluble ink is printed by gravure printing while the long polymer film 1 is continuously running, and the printed water-soluble ink is cured after printing. Polymer film 1 printed with water-soluble ink in this way
An aluminum thin film layer 8 having a thickness such that the resistance value was 3Ω/□ was formed by vacuum deposition on the printed surface side of the substrate. FIG. 2 shows a state in which an aluminum thin film layer 8 is formed on the printing surface side of the polymer film 1. The vapor deposition of aluminum is applied to the entire surface of the polymer film 1, that is, the printed film 2.
, 3, 4, 5, 6 and 7, and FIG. 2(a) is a cross-sectional view when the aluminum thin film layer 8 is formed, and FIG. 2(b) is a cross-sectional view of the aluminum thin film layer 8.
1 is a plan view when an aluminum thin film layer 8 is formed on a print pattern of water-soluble ink printed on a polymer film 1. FIG. FIGS. 3(a) and 3(b) show that after forming an aluminum thin film layer 8 by vacuum evaporation, its surface is washed with water to form printed films 2, 3, 4, 5, 6 and 7 with water-soluble ink. This shows the state in which the printed films 2, 3,
4, 5, 6 and 7, and the aluminum thin film layer 8 deposited on top thereof are removed by water washing, leaving the margin parts 2a, 3a, 4a, 5a, 6a and 7, respectively.
a will be formed on the surface of the polymer film 1. The portion of the aluminum thin film layer 8 on which the water-soluble ink is not printed remains on the polymer film 1 as an electrode. Reference numeral 9 denotes a fuse portion for providing a safety function to the film capacitor, and in this example, the length in the longitudinal direction is 0.5 mm. This fuse section 9 operates as follows. An abnormality occurs in the electrode 8 made of an aluminum thin film layer between the fuse part 9 and the margins 2a and 4a, and the fuse part 9
When the current flowing through the fuse section 9 exceeds 100 mA, the fuse section 9
As the temperature rises and the aluminum thin film layer of the fuse part 9 disappears, short circuit with the counter electrode is prevented and burnout of the film capacitor is prevented. FIG. 4 shows an example of the winding structure of the film capacitor in this embodiment, in which the metallized film G with a margin cut at C and D shown in the cross-sectional view of FIG. Two sheets of the metallized film H with a margin cut at F are wound so that the surfaces of the aluminum thin film layer 8 and the polymer film 1 are in contact with each other, and the cut surfaces C and E and D and F match, respectively. capacitor element 10
After forming the external electrode 11 and the external lead electrode 1
2 was provided to form a film capacitor. In order to confirm the safety of the film capacitor according to the present invention, various tests were conducted using 100 film capacitors, and as a result, there were no burnout accidents that occurred when the film capacitor was abnormal. [0017] In explaining the embodiments, specific materials, shapes, dimensions, and printing patterns were used.
The invention is not limited to these materials, dimensions or printed patterns. In particular, the metal thin film layer was explained using aluminum (Al) as an example, but in addition to this, gold (
Au), silver (Ag), copper (Cu), nickel (Ni),
It may be chromium (Cr), tin (Sn), zinc (Zn), or the like. According to the above embodiment, the printed films 2, 3, 4, 5, 6 and 7 are provided on the polymer film 1 at the margins using water-soluble ink, and the aluminum thin film layer 8 is further provided. After being deposited on the entire surface, printed films 2, 3, 4,
By washing and removing elements 5, 6 and 7, margins 2a, 3a, 4a, 5a, 6a and 7a are formed, making it possible to obtain an extremely safe and inexpensive film capacitor. . Effects of the Invention As is clear from the above embodiments, the film capacitor of the present invention can easily form continuous or discontinuous margins in the longitudinal direction and width direction, so that the safety function of the film capacitor can be easily added. can. That is, since the margin is formed by printing, the degree of freedom in the printing pattern is high, the safety function of the film capacitor can be easily added, and a highly safe film capacitor can be obtained. Furthermore, production costs can be reduced by forming margins by printing, and inexpensive film capacitors can be provided.

[Brief explanation of the drawing]

FIG. 1: (a) A cross-sectional view of a metallized film used in a film capacitor according to the present invention at an early stage of production; (b) A plan view of a metallized film at an early stage of production.

[Figure 2] (a) Cross-sectional view at an intermediate stage in the production of the metallized film (b) Plan view at an intermediate stage in the production

[Figure 3] (a) Cross-sectional view of the metallized film at the final stage of production (before cutting) (b) Plan view at the final stage of production (before cutting)

FIG. 4 is a partially exploded perspective view of a film capacitor in an embodiment of the present invention.

[Figure 5] Schematic cross-sectional view of a conventional film capacitor

[Figure 6
] (a) Cross-sectional view of the metallized film (before cutting) used in a conventional film capacitor (b) Plan view of the same metallized film (before cutting)

[Explanation of symbols]

1 Polymer film 2a Margin
3a Margin 4a Margin 5a Margin 6a Margin 7a Margin 8 Metal thin film layer 9 Fuse section

Claims (2)

[Claims] 1. A film capacitor using a metallized film in which a metal thin film layer is formed on the surface of a polymer film used as a dielectric, wherein the margin of the metallized film is continuous in the longitudinal direction of the polymer film. a margin that is discontinuous in the longitudinal direction of the polymer film, a margin that is discontinuous in the width direction of the polymer film, and a gap between the margins that are discontinuous in the longitudinal direction of the polymer film. The film capacitor that made up the fuse section. 2. A method for manufacturing a film capacitor in which a metallized film having a metal thin film layer, a margin, and a fuse portion formed on the surface of a polymer film used as a dielectric is wound or laminated. A predetermined printing pattern is printed with water-soluble ink on the surface of the polymer film before it is formed and metallized, and aluminum (Al), gold (Au), and silver (Ag) are applied to the printed surface side by vacuum evaporation method. ，
Copper (Cu), nickel (Ni), chromium (Cr), tin (
After forming a metal thin film layer consisting of a single thin film or laminated thin film of single or mixed metals such as Sn), zinc (Zn), etc., water-soluble ink and its A method for manufacturing a film capacitor, comprising removing the metal thin film layer on the water-soluble ink to form a margin and a fuse part.