JPH0344410B2 - - Google Patents

Description

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

BACKGROUND TECHNOLOGY Conventionally, metallized film capacitors can be manufactured in two main ways: two-wound film capacitors and one-wound film capacitors.

There are four types of double-wound film capacitors:

(1) As shown in FIG. 6, a vapor deposition electrode 2 is formed on one side of a dielectric film 1 by vapor deposition or sputtering (hereinafter referred to as vapor deposition), and two single-sided metalized films 3 are stacked. Method for manufacturing a single-sided metallized film capacitor (2) As shown in FIG. Method for manufacturing a double-sided metallized film capacitor in which two sheets are overlapped and wound (3) As shown in FIG. Manufacturing method of a single-sided metalized film multilayer capacitor to obtain a unit capacitor (4) As shown in FIG. Manufacturing method for double-sided metallized film multilayer capacitors that are then cut to obtain unit capacitors.
There is a street.

(1) Double-sided metallized film 4 as shown in Figure 10
Method for manufacturing a Lacquered film capacitor (2) in which only one Lacquer coated double-sided metallized film on which a dielectric material 6 is formed by Lacquer coating or the like is wound.(2) As shown in FIG. A method for manufacturing a lattice film multilayer capacitor in which a single coated double-sided metallized film is wound around a large bobbin and then cut to obtain a unit capacitor.Problems to be Solved by the InventionHowever, the above-mentioned double-wound film capacitor In the manufacturing method, two thin films (1.5 μm or more) are overlapped and wound.
It is difficult to adjust the misalignment of two thin films and the tension between two thin films, and requires skill.
Moreover, it was difficult to increase the speed.

In addition, single-wound film capacitors using a Lutzker-coated double-sided metallized film have better winding productivity than double-wound film capacitors, but since the Lutzker-coating process is required, the overall This has not led to significant productivity improvements.

In view of these conventional drawbacks, the present invention aims to manufacture capacitors with high productivity and precision by winding and cutting only one single-sided metallized film without lacquer coating. The present invention provides a method.

Means for Solving the Problem In order to solve this problem, the method for manufacturing a capacitor of the present invention is such that the deposition margins of the single-sided metallized films that overlap are arranged alternately at opposite ends. a step of forming a part;
The process includes the steps of winding this single-sided metallized film onto a bobbin to form a base capacitor, and cutting the base capacitor to obtain unit capacitors.

Effect According to the capacitor manufacturing method of the present invention, the cross section of the base capacitor formed by winding one film is as follows:
The vapor deposition margins of the single-sided metallized films that touch and overlap each other are arranged alternately at opposite ends, creating a structure similar to that of a two-wound single-sided metalized film capacitor.

Furthermore, by cutting this base capacitor, the vapor-deposited electrodes, which had been connected as a single film, become independent electrodes one by one, resulting in the structure of a single-sided metallized film multilayer capacitor.

Embodiment 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 invention. That is, one single-sided metallized film 12 supplied from the supply bobbin 11 is separated from the winding bobbin 14 by the margin forming laser 13 at both ends in the width direction.
The vapor-deposited metal 12a at the end is alternately rotated for each length of rotation.
is scattered, and a vapor deposition margin portion 12b is formed. Next, a plurality of notches 12c having a depth narrower 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 notch is wound onto the winding bobbin 14 to obtain the base capacitor 16. After forming an electrode lead-out portion 17 on the wound end face of the base capacitor 16 by metal spraying, it is cut as shown in FIG. 3 to obtain a unit capacitor 18. FIG. 4 is a diagram showing the laminated state of the films of this unit capacitor 18.

Next, the operation of the manufacturing method of this embodiment will be explained. The base capacitor 16 wound on the winding bobbin 14 is formed by forming a vapor deposition margin portion 12b at the end of one single-sided metallized film 12 for each rotation of the winding bobbin 14 using the margin forming radar 13. The cross section of is always like the cross section A-A in FIG. 2, where the vapor deposition margins 12b of the single-sided metallized films 12 that touch and overlap are at the opposite ends, as if they were double-wound single-sided metal films. The structure is that of a film capacitor.

Furthermore, by spraying metal onto the end face of the base capacitor 16 and cutting it, the vapor-deposited electrodes 12a, which had been connected as a single film, become independent electrodes one by one, and the structure of the single-sided metallized film multilayer capacitor is becomes.

Note that the notch portion 12c formed by the notch laser 15 is provided in order to obtain contact between the sprayed metal and the vapor deposited electrode. Also, this notch 12
c may be obtained by cutting off the end of the vapor deposition margin portion 12b to a width narrower than the vapor deposition margin width as shown in FIG.

As a result, the function of a capacitor can be obtained by simply winding and cutting only one single-sided metalized film, making it possible to adjust the misalignment and tension adjustment of the two thin films, which were the drawbacks of conventional two-wound film capacitors. becomes unnecessary. Also, the lacquer coating required in conventional single-wound film capacitors is no longer necessary.

In this way, the work does not require skill and the process is simplified, making automation possible and dramatically improving productivity.

In addition, as a margin forming method, in the embodiment,
Although a laser forming method is used, the present invention is not limited to this, and examples include a masking method during vapor deposition, and a method in which vapor-deposited metal is scattered by spark discharge.

In addition, as a method for making the vapor deposition margins of the one-sided metallized films that touch and overlap alternately come to opposite ends, in the embodiment, the vapor deposition margins of the end portions are deposited every one rotation of the take-up bobbin. Although the vapor deposition margin is formed by scattering the metal, the present invention is not limited to this method. It is sufficient that the vapor deposition margins of the overlapping metallized films are arranged alternately at opposite ends.

Effects of the Invention As described above, the present invention includes a step of forming margin portions so that the vapor deposition margin portions of metalized films that touch and overlap are alternately located at opposite ends, and a step of forming the margin portions of the metalized films that overlap each other, and The manufacturing method includes the steps of winding a single-sided metallized film onto a bobbin to create a base capacitor, and cutting the base capacitor to obtain unit capacitors. Because of this, no skill is required for the work, and the process is simplified, making automation possible, dramatically improving productivity, and making a truly great contribution to industry.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a single-sided metallized film of a capacitor according to the present invention, FIG.
FIG. 3 is a cross-sectional view taken along the line A-A in FIG. 5 is a perspective view showing another example of the single-sided metallized film used in the present invention. FIG. 6 is a perspective view of the main parts of a conventional single-sided metalized film capacitor. 7
The figure is a perspective view of the main parts of a conventional double-sided metallized film capacitor, Figure 8 is a perspective view of the main parts of a conventional single-side metallized film multilayer capacitor, and Figure 9 is the main part of a conventional double-side metallized film multilayer capacitor. FIG. 10 is a perspective view of the main parts of a conventional Rackard film capacitor, and FIG. 11 is a perspective view of the main parts of a conventional Rackard film multilayer capacitor. 12... Single-sided metallized film, 12a... Vapor deposited metal, 12b... Vapor deposition margin portion, 12c... Notch portion, 16... Base capacitor, 17... Electrode lead portion, 18... Unit capacitor.

Claims (1)

[Scope of Claims] 1. A step of forming margin portions so that the vapor deposition margin portions of single-sided metalized films that touch and overlap are alternately located at opposite ends, and a step of forming the margin portions of the single-sided metalized films on a bobbin. 1. A method for manufacturing a capacitor, comprising the steps of making a wound matrix capacitor and cutting the matrix capacitor to obtain unit capacitors. 2. The method of manufacturing a capacitor according to claim 1, wherein the end portion of the vapor deposition margin portion is cut to a width narrower than the vapor deposition margin width. 3. The capacitor manufacturing method according to claim 1, wherein a plurality of notches having a depth narrower than the width of the vapor deposition margin are formed at the end of the vapor deposition margin.