JPH0445963B2 - - 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 ways: two-wound film capacitors and one-wound film capacitors. There are four types of double-wound film capacitors:

(1) As shown in FIG. 4, two single-sided metallized films 10 that are metallized on one side of a dielectric film by a vapor deposition method or a sputtering method (hereinafter referred to as vapor deposition) are overlapped and wound. Manufacturing method for a metalized film capacitor (2) As shown in Fig. 5, a double-sided metalized film is produced by overlapping and winding two double-sided metalized films 11 and 2 non-metalized films 12 deposited on both sides of a dielectric film. Method for manufacturing a capacitor (3) As shown in FIG. 6, a method for manufacturing a single-sided metalized film multilayer capacitor in which two sheets of the single-sided metalized film 10 are stacked, wound around a large bobbin, and then cut to obtain unit capacitors. (4) As shown in FIG. 7, the double-sided metallized film 11 and the non-metalized film 12 are stacked together, wound around a large bobbin, and then cut to obtain a double-sided metalized film multilayer capacitor. There are also two ways to manufacture single-wound film capacitors:

(1) Double-sided metallized film 11 as shown in Figure 8
Manufacturing method of a Lacquered film capacitor (2) in which only one Lacquer coated double-sided metallized film on which a Lacquer film 13 as a dielectric material is formed by Lacquer coating or the like is wound (2) As shown in Fig. 9. A method for manufacturing a Lacquered film multilayer capacitor in which a unit capacitor is obtained by winding only one sheet of the Lutzker-coated double-sided metalized film onto a large bobbin and cutting it to obtain a unit capacitor. Metal, 6 is the margin.

Problems to be Solved by the Invention However, in the method for manufacturing a two-layer film capacitor as described above, two thin films (1.5 μm or more) are overlapped and wound.
It is difficult to adjust the misalignment of the two thin films and the tension between the 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 However, productivity has not improved.

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 capacitor manufacturing method of the present invention is such that a single wide single-sided metallized film is coated with an interval of two capacitors in the width direction of the film. a process of forming margins such that the next margin is formed at an interval corresponding to the length of the film and at an intermediate position of the previously formed margin for each predetermined length in the longitudinal direction of the film; The process includes the steps of winding up the film and cutting the wound film into strips at each margin.

Effects According to the capacitor manufacturing method of the present invention, a single wide single-sided metallized film is wound up and cut into individual strips. The margins are at opposite cut ends, creating a structure similar to that of a double-wound, single-sided metallized film capacitor.

Furthermore, by cutting the capacitor, the metallized electrodes, which have been connected in one film up until now, 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. 1 shows a method for manufacturing a capacitor according to an embodiment of the present invention, and FIG. 2 shows a film lamination state of the capacitor obtained by the method. As shown in FIG. 2, the capacitor obtained by the method of the present invention has a structure similar to the capacitor constructed using two single-sided metalized films shown in FIG. In FIG. 2, 5 is a vapor-deposited metal;
6 is a margin, 7 is a notch, and has a structure in which single-sided metallized films 14 in which vapor-deposited metal 6 is formed on one side of a dielectric film are laminated so that the margins 6 are alternately located at opposite ends.

Next, an embodiment of the manufacturing method of the present invention will be described with reference to FIG.

As shown in FIG.
is supplied from the supply bobbin 1, and a margin 6' is formed on the single-sided metallized film 14 by simultaneously scattering a plurality of strips of vapor-deposited metal 5 using the margin forming laser 3. This margin 6' is approximately twice as wide as the width of the margin 6 of the capacitor as a finished product. The next margin 6' is formed in the middle position. After this margin 6' is formed, the notch laser 4 penetrates the margin 6' so that a notch 7 is formed when the single-sided metallized film 14 is cut at an intermediate position of this margin 6'. The holes 7' are continuously formed, and the winding bobbin 1
5, the single-sided metal film 14 is wound several times.
Note that 2 is a wound single-sided metallized film.

FIG. 1b shows this single-sided metallized film 14 being wound up.

Next, as shown in FIG. 1c, the wound material is removed from the winding bobbin 15 and cut along a line passing through the center of the margin 6' to obtain the matrix condenser 8 shown in FIG. 1d. FIG. 1e shows a sectional view taken along line A--A in FIG. 1d.

After that, an electrode lead-out portion 9 is formed on the cut end surface of the base capacitor 8 by metal spraying, and then a unit capacitor 8' is obtained by cutting with a rotating cutting blade 16 as shown in FIG. 1e.

Next, the operation of the manufacturing method of this embodiment will be explained. 1 wide single-sided metallized film 14
The margin forming laser 3 forms margins 6' alternately every one rotation of the winding bobbin 15,
Moreover, the wound film is removed from the winding bobbin 15, and the cross sections of the mother capacitor 8 cut into each strip are always in contact and overlap each other as shown in FIG. 1e.
The margins 6 of each single-sided metallized film are at opposite cut ends, so that the structure is similar to that of a two-wound single-sided metalized film capacitor.

Furthermore, the wound film is transferred to the winding bobbin 15.
By removing the capacitor from the capacitor and cutting it, or by cutting the base capacitor, the vapor-deposited electrodes that were connected as a single film become independent electrodes one by one, creating the structure of a single-sided metallized film multilayer capacitor. .

Also, a notch 7 formed by the notch laser 4
is provided to establish contact between the sprayed metal and the vapor deposition electrode 5.

Also, this notch has a margin of 6 as shown in Figure 3.
It is also possible to cut out the middle part of the frame to be narrower than the width of the margin 6.

As a result, it has the function of a capacitor and can be produced in large quantities by simply winding and cutting one wide single-sided metalized film, which was a drawback of conventional two-wound film capacitors. It becomes unnecessary to adjust the misalignment and tension between two films, and also eliminates the need for lacquer coating, which is required in conventional single-wound film capacitors.

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

In this example, a laser forming method was used as the margin forming method, but the method is not limited to this. For example, forming by a masking method during vapor deposition, or a method in which vapor deposited metal is scattered by spark discharge may be used. etc.

In addition, in this embodiment, as a method for making the margins of the single-sided metalized films that overlap and come into contact with the cut ends on opposite sides, one of the winding bobbin
The vapor-deposited metal on the cut end on the opposite side is scattered for every length of rotation to form a margin, but the invention is not limited to this. Scatter the vapor-deposited metal on the cut end of the
The method for forming the margins may be such that the margins of the metallized films that overlap when forming the base capacitor are located at opposite cut ends.

Effects of the Invention As described above, the present invention allows the margin of the single-sided metallized film that touches and overlaps to be separated from the cut ends on opposite sides when a single wide single-sided metallized film is wound up and cut into strips. By forming a margin so that the capacitor comes in contact with the capacitor and winding this one single-sided metallized film, the capacitor function can be achieved by simply winding and cutting one wide single-sided metalized film. There is no need to adjust the misalignment or tension between the two films, which was a disadvantage of conventional two-wound film capacitors, and there is no need for lacquer coating, which is required for conventional single-wound film capacitors. become. In this way, the work does not require skill, the process is simplified, and it can be produced in large quantities, making automation possible and dramatically improving productivity, making it a truly great contribution to industry. .

[Brief explanation of drawings]

FIGS. 1a to 1f are schematic diagrams showing the state of main steps of a method for manufacturing a capacitor according to an embodiment of the present invention,
FIG. 2 is a perspective view of the main parts of a capacitor obtained by the same method, FIG. 3 is a perspective view of a single-sided metallized film in another embodiment of the present invention, and FIGS. FIG. 2 is a perspective view of main parts of the capacitor. 2... One-sided metallized film wound up, 5...
Vapor deposited metal, 6, 6'...margin, 7...notch, 7'...through hole, 8...base capacitor,
8'...Unit capacitor.

Claims (1)

[Scope of Claims] 1. A single wide single-sided metallized film, with a space in the width direction of the film corresponding to two capacitors, and a predetermined length in the longitudinal direction of the film. a step of forming a margin so that the next margin is formed at an intermediate position between the margins formed in the previous step; a step of winding the one single-sided metallized film; and a step of winding the wound film strip by strip at each margin. A method for manufacturing a capacitor, the method comprising: cutting the capacitor into pieces. 2. Cut the middle part of the margin of the single-sided metallized film,
2. The method of manufacturing a capacitor according to claim 1, wherein the capacitor is cut out with a width narrower than the width of the margin. 3. The method of manufacturing a capacitor according to claim 1, wherein a through hole is provided in the margin of the single-sided metallized film so that a notch is formed when the film is cut at the margin.