JP2624449B2 - Manufacturing method of capacitor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a metallized film capacitor used for electronic equipment and electric equipment.

[0002]

2. Description of the Related Art Conventionally, there are roughly two methods for manufacturing a metallized film capacitor, namely, a two-sheet film capacitor and a one-sheet film capacitor.

[0003] Among the double-wound film capacitors, the following 4
There is a street. (1) As shown in FIG. 6, a deposition electrode 2 is formed on one surface of a dielectric film 1 by a vapor deposition method or a sputtering method (hereinafter referred to as vapor deposition), and two metallized single-sided metallized films 3 are superposed. (2) As shown in FIG. 7, a double-sided metallized film 4 in which vapor-deposited electrodes 2 are vapor-deposited on both sides of a dielectric film 1 and two non-metallized films 5 as shown in FIG. (3) As shown in FIG. 8, the single-sided metallized film 3
Are laminated and wound on a large bobbin and then cut to obtain a unitary capacitor. (4) As shown in FIG.
And a method of manufacturing a double-sided metallized film laminated capacitor in which two non-metallized films 5 are superimposed, wound around a large bobbin, and then cut to obtain a unit capacitor. There is a street. (1) As shown in FIG. 10, a lacquer film capacitor is produced by winding only one lacquer-coated double-sided metallized film having a dielectric 6 formed on the double-sided metallized film 4 by lacquer coating or the like. Method (2) As shown in FIG. 11, a method of manufacturing a lacquer film multilayer capacitor in which only one lacquer-coated double-sided metallized film is wound around a large bobbin and then cut to obtain a unit capacitor.

[0004]

However, in the method for manufacturing a two-layer film capacitor as described above,
Since two thin films (1.5 μm or more) are superposed and wound, it is difficult to adjust the displacement of the two thin films and the tension of the two thin films, and it requires skill and high speed. Was difficult.

[0005] In a single-layer film capacitor using a lacquer-coated double-sided metallized film, the productivity at the time of winding is superior to that of a double-layer film capacitor, but a lacquer-coating step is required. However, total productivity has not been improved.

The present invention has been made in view of the above-mentioned conventional drawbacks,
An object of the present invention is to provide a method for manufacturing a capacitor with high productivity and high precision by winding and cutting only one single-sided metallized film without lacquer coating.

[0007]

In order to solve this problem, a method of manufacturing a capacitor according to the present invention comprises a method of manufacturing a capacitor, comprising the steps of: Forming a single-sided metallized film on a bobbin to form a mother capacitor, and cutting the mother capacitor to obtain a unit capacitor.

[0008]

According to the method of manufacturing a capacitor of the present invention, the cross section of the mother capacitor wound with one film must be
The deposition margin portions of the single-sided metallized films that are in contact with each other and overlap each other are alternately provided at the opposite ends, and the structure becomes as if a double-wound single-sided metallized film capacitor.

Further, by cutting the mother capacitor, the vapor-deposited electrodes which have been connected by a single film until now become independent electrodes one by one, and have a structure of a single-sided metallized film laminated capacitor.

[0010]

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

FIG. 2 shows a schematic diagram of a method for manufacturing a capacitor according to the present invention. In other words, the one-sided metallized film 12 supplied from the supply bobbin 11 is alternately provided at both ends in the width direction by the margin forming laser 13 for each rotation of the take-up bobbin 14. The vapor deposition metal 12a is scattered to form a vapor deposition margin portion 12b. Next, a plurality of notches 12c having a depth smaller than the width of the evaporation margin are provided at the end of the evaporation margin 12b by the notch laser 15. FIG. 1 shows the film. Then, the film provided with the margin and the notch is wound around the winding bobbin 14 to obtain the mother capacitor 16. After forming an electrode lead-out portion 17 by metal spraying on the winding end surface of the base capacitor 16, it is cut as shown in FIG. 3 to obtain a unit capacitor 18. FIG. 4 is a view showing a laminated state of the film of the unit capacitor 18.

Next, the operation of the manufacturing method of this embodiment will be described. A single-sided metallized film 12 is formed by a margin forming radar 13 at one end of a winding bobbin 14 with a vapor deposition margin portion 12b at each end of the winding bobbin 14, so that a base capacitor 16 wound on the winding bobbin 14 is formed. 2A-A cross-section always touches and overlaps 1
Margin 12 of one-sided metallized film 12
b are at opposite ends, as if by a double-wound single-sided metallized film capacitor.

Further, after metal spraying is performed on the end face of the base capacitor 16 and then cut, the vapor-deposited electrodes 12a connected by one film become independent electrodes one by one. It has the structure of a capacitor.

The notch 12c formed by the notch laser 15 is provided to obtain contact between the sprayed metal and the deposition electrode. In addition, as shown in FIG. 5, the notch 12c may cut off the end of the vapor deposition margin 12b with a width smaller than the vapor deposition margin.

[0015] As a result, since only one single-sided metallized film is wound and cut, it has the function of a capacitor, which is a drawback of the conventional two-sheet film capacitor.
It is not necessary to adjust the displacement and tension of the thin films. Further, a lacquer coating such as a conventional single-wound film capacitor such as a lacquer film capacitor is not required.

As described above, since the operation does not require skill and the process is simplified, automation becomes possible and the productivity is dramatically improved.

As a method of forming a margin, a laser forming method is used in the embodiment. However, the present invention is not limited to this. For example, a method of forming by a masking method at the time of vapor deposition or a method of scattering vapor deposited metal by spark discharge. Etc.

As a method of alternately forming the deposition margins of the single-sided metallized films that are in contact with each other on the opposite ends, in the embodiment, an end is formed for each rotation of the winding bobbin. The vapor deposition metal is scattered to form the vapor deposition margin. However, the present invention is not limited to this. For example, the vapor deposition metal at the end is scattered every 1 / (odd) rotation of the winding bobbin to form the vapor deposition margin. It is only necessary that the deposition margins of the metallized films that contact and overlap alternately come to the opposite ends.

[0019]

As described above, the present invention is directed to a process of forming a margin portion so that a deposition margin portion of a metallized film which is in contact with and overlaps with an end portion opposite to each other is formed. Winding a single-sided metallized film on a bobbin to form a mother capacitor, and cutting the mother capacitor to obtain a unit capacitor. With the function of, without the need for skill in the work,
In addition, since the process is simplified, automation becomes possible, dramatically improving productivity, and there are many things that contribute to the industry.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a single-sided metallized film of a capacitor according to the present invention.

2A is a schematic view of one embodiment of a method of manufacturing the same capacitor. FIG. 2B is a cross-sectional view taken along line AA in FIG. 2A.

FIG. 3 is a schematic view of a step of obtaining a unit capacitor by cutting in the method for manufacturing a capacitor of the present invention.

FIG. 4 is a perspective view of a main part of a capacitor manufactured according to one embodiment of the present invention.

FIG. 5 is a perspective view showing another example of a single-sided metallized film used in the present invention.

FIG. 6 is a perspective view of a main part of a conventional single-sided metallized film capacitor.

FIG. 7 is a perspective view of a main part of a conventional double-sided metallized film capacitor.

FIG. 8 is a perspective view of a main part of a conventional single-sided metallized film laminated capacitor.

FIG. 9 is a perspective view of a main part of a conventional double-sided metallized film laminated capacitor.

FIG. 10 is a perspective view of a main part of a conventional lacquer film capacitor.

FIG. 11 is a perspective view of a main part of a conventional lacquer film multilayer capacitor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Single-sided metallized film 12a Deposited metal 12b Deposition margin 12c Notch 16 Base capacitor 17 Electrode lead 18 Unit capacitor

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Kunio Oshima 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-55-160420 (JP, A) JP-A-50-85855 (JP, A) JP-B-49-7413 (JP, B1)

Claims (1)

(57) [Claims] 1. A method of manufacturing a capacitor by winding and cutting one single-sided metal film, comprising:
When winding the single-sided metallized film, a step of forming a deposition margin portion so that the end portions of the single-sided metallized film contact and overlap with each other, alternately on opposite sides, and then the single-sided metallized film Is wound around a bobbin to form a mother capacitor, and further, a step of cutting the mother capacitor to obtain a unit capacitor is provided.