JPH0141280B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for manufacturing a metallized film capacitor, which is constructed by winding a metallized film in which metal electrodes are formed on the surface of a dielectric film by vapor deposition. Traditionally, in metallized film capacitors,
As shown in FIGS. 1a and 1b, metal electrodes 2 are deposited on one or both sides of a dielectric film 1 such as polypropylene film, polyester film, polycarbonate film, or paper film by vapor deposition.
0.5 mm at the widthwise end of the dielectric film 1.
The metallized film 4 is obtained by providing and forming an insulating part 3 (usually called a margin part, hereinafter referred to as a margin part) of about 5 mm. When obtaining a capacitor using such a metallized film 4, two metallized films 4 are overlapped and wound as shown in FIG. Zn, Sn,
The electrode extraction part 5 is sprayed with metal materials such as Cn and Pb.
Connect the lead wires 6 by welding or the like to form the capacitor element 7, or stack the metallized films 4 one by one with the margins 3 on the opposite side as shown in FIG. Similar to a wound type capacitor, the electrodes are pulled out to form a capacitor element. By the way, if we analyze and evaluate such wound type and multilayer capacitors in detail from the viewpoint of productivity, characteristics, etc., each type has its advantages and disadvantages. In particular, the major difference in characteristics is that multilayer capacitors have a structure in which multiple small capacitance capacitors are connected in parallel, so even if a part of the metallized film breaks down due to some abnormality during use, , only one capacitor element loses its function,
There is almost no effect on other capacitor elements, resulting in only a slight reduction in capacitance. This makes it a very safe capacitor. On the other hand, wound-type capacitors can be easily manufactured using conventional general equipment, so they are currently the mainstream. When this occurs, the capacitance change due to the destruction phenomenon is only a decrease proportional to the reduced area of the metallized film electrode, so it can be ignored at the initial stage, but this type of wound capacitor 1
Since it is a single capacitor, the damage progresses gradually without stopping, with one part of the broken part as the nucleus, eventually leading to smoke and ignition. Therefore, sufficient safety cannot be ensured in this wound type capacitor unless some kind of safety device is added. In view of the current situation, the present inventors have proceeded with the development of a capacitor that combines the high productivity of a wound type capacitor with the high safety of a laminated type capacitor. As a result, as shown in FIGS. 4 and 5, the margin portion 3 provided at the end in the width direction
Separately, the margin portion 3 is divided into a plurality of rectangular islands in the length direction of the film.
The metallized film 4 is configured by providing a margin portion 8 connected to the metallized film 4.
If the capacitor element 7 is constructed by stacking two layers and winding them, the capacitor element 7 can be manufactured in the same manner as a wound type capacitor, and the electrode structure is similar to that of a laminated type. Even if a destructive phenomenon occurs in a part of 2, it will not spread to the whole, and accidents such as smoke and ignition can be prevented. In other words, they discovered that it could be equipped with a safety function. The present invention provides a method for manufacturing a metal film capacitor having such a structure with high productivity, and the content of the present invention will be explained below. FIG. 5 is a diagram showing a state in which a manufacturing method according to an embodiment of the present invention is being implemented, and all of these devices are installed in a vacuum container. First, the dielectric film 1 guided by the guide roller 9 reaches the oil deposition device 10, and oil 11 of a constant width is deposited at regular intervals. FIG. 6 is a perspective view of the oil deposition device 10, and shows the oil 1
It consists of a boiler 12 containing a boiler 1 and a rotary shutter 13 rotating outside the boiler 12. The boiler 12 and the rotary shutter 13 are provided with slits 12a and 13a having a width of about 0.5 to 5.0 mm in the same direction as the width of the dielectric film 1. Further, the device is arranged so that the dielectric film 1 comes into contact with the rotary shutter 13 in the direction of the opening 12a of the boiler 12. Here, the oil 11 in the boiler 12 is heated and vaporized by an electric heater or the like. This vaporized oil 1
1 tries to exit outside through the opening 12a of the boiler 12. At this time, when the slits 13a of the boiler 12 and the rotary shutter 13 overlap as shown in FIG. 7a, the oil 11 adheres to the dielectric film 1. However, at other times, that is, when the openings 12a and 13a of the boiler 12 and the rotary shutter 13 do not overlap as shown in FIG. 7b, the amount of oil discharged from the slit 13a of the rotary shutter 13 is extremely small. becomes. Further, in this state, the slit 13a of the rotary shutter 13 and the dielectric film 1 are not in contact with each other, so that the oil 11 does not adhere to the dielectric film 1. Furthermore, since the rotary shutter 13 rotates in synchronization with the feeding speed of the dielectric film 1, it is possible to obtain oil film bands at regular intervals. The dielectric film 1 having the oil 11 adhered to it in a constant width and at constant intervals is guided and fed to the cooling roller 14 as shown in FIG. At this time, the electrode material 16 evaporated from the evaporation source 15 reaches the dielectric film 1 and forms the electrode 2. As a result, the electrode material 16 does not adhere to the band portion of the oil film, resulting in the margin portion 8 being obtained. The width of this margin section 8 can be freely selected by changing the widths of the slits 12a and 13a of the boiler 12 and the rotating shutter 13, and the spacing can be selected by selecting the diameter of the rotating shutter 13 or the number of slits 13a. By doing so, you can freely decide. Further, in this embodiment, the rotary shutter 13 and the dielectric film 1 are brought into contact with each other, but there is a certain amount of gap, for example.
The margin portion 8 can be obtained even if the distance is 0.1 mm to 1.0 mm. You can change the spacing freely. In this way, the margin portions 8 having a constant width and constant intervals can be obtained, but at the same time, the margin portions 3 parallel to the length direction of the dielectric film 1 must be formed, which is already known. It can be easily formed by using the oil masking method, tape masking method, etc., which are currently available, in combination with the apparatus of the present invention. Note that the type of oil 11 used in the method of the present invention may be selected depending on the type of electrode material 16 and the type of dielectric film 1 to be vapor-deposited, and this is well known and is described in this book. It does not limit the invention. Further, the margin parts 3 and 8 do not necessarily have to intersect at right angles, but the rotating shutter 13 may intersect at a certain angle.
Even if the margin portion 8 is formed by changing the shape of the opening portion 13a, a wound capacitor having a safety function can be obtained as described above. Actually, in order to increase productivity, a wide dielectric film 1' is used as shown in FIG. 8, and multiple rows of electrodes 2 are formed on the surface of the dielectric film 1'. Make it disconnect. Furthermore, in the present invention, the margin part 8 is made into a completely insulating groove part, but by providing a high resistance part 8' in which the electrode material is deposited thinner than the electrode 2, as shown in FIG. It is also possible to obtain a capacitor with the aforementioned safety features. If the film thickness of this high resistance part 8' is, for example, 2/3 or less of the film thickness of the electrode 2, a sufficient safety function can be ensured. Therefore, by changing the amount of oil 11 attached to the dielectric film 1, it can be freely controlled. In the present invention, FIG. 8 or 9
The base film 4' as shown in the figure is cut along the margin part 3 to form a metalized film 4, and the metalized film 4 is wound as shown in FIG.
A capacitor element 7 can be obtained by forming and connecting lead wires 6. The following table shows the results of a safety confirmation test on the capacitor obtained by the method of the present invention and a conventional wound type capacitor.

【table】

[Table] The test method is twice the rating of the capacitor and 3 times the rating of the capacitor.
A double voltage was continuously applied at room temperature, and judgment was made based on whether or not smoke and ignition occurred before the current value became zero. As described above, in the manufacturing method of the present invention, when depositing the electrode material on the surface of the dielectric film 1, the margin part 8 or the high resistance part 8' can be provided at the same time as the margin part 3. When providing the resistive portion 8', the film thickness can be set arbitrarily. In addition, it can be easily realized by adding the device of the present invention to a conventional vapor deposition machine, and it can be easily realized by adding the device of the present invention to a conventional vapor deposition machine. Capacitors can be obtained. Moreover, since the manufacturing process is the same as that for conventional wound capacitors, there is no reduction in productivity. As described above, the method of the present invention includes disposing an oil evaporator having a slit in a direction perpendicular to the feeding direction of the dielectric film, and feeding the dielectric film so as to surround the oil evaporator. Using an oil deposition device consisting of a cylindrical rotary shutter with slits perpendicular to the dielectric film, oil is deposited on the dielectric film at regular intervals by rotating the rotary shutter. Since the electrode material is vapor-deposited from the electrode material, it is possible to form margins of a certain width with high accuracy at certain intervals, and the width and the interval can be changed very easily by selecting the slit width of the rotary shutter and the diameter of the shutter. Can be done. Furthermore, the complexity of the oil coating operation required in the oil masking method is eliminated, and its industrial implementation is easy.

[Brief explanation of drawings]

Figures 1a and b are perspective views showing a general metallized film, Figure 2 is a perspective view showing the main parts of a general wound type metallized film capacitor, and Figure 3 is a general multilayer metallized film capacitor. FIG. 4 is a perspective view showing the main parts of a film capacitor, FIG. 4 is a perspective view showing the main parts of a metallized film capacitor obtained by the present invention, and FIG. figure,
Figure 6 is a perspective view showing the main parts of the apparatus used in the method, Figures 7a and b are sectional views for explaining the operation of the main parts shown in Figure 6, and Figures 8 and 9 are FIG. 2 is a plan view showing an example of a base film obtained by the manufacturing method of the invention. DESCRIPTION OF SYMBOLS 1... Dielectric film, 2... Electrode, 3... Margin part, 4... Metallized film, 7... Capacitor element,
8... Margin part, 8'... High resistance part, 10... Oil deposition device, 11... Oil, 12... Boiler, 12a... Slit, 13... Rotating shutter, 13a... Slit.

Claims (1)

[Claims] 1 An oil evaporator having a slit in a direction perpendicular to the feeding direction of the dielectric film is arranged, and a slit is provided in a direction perpendicular to the feeding direction of the dielectric film so as to surround the oil evaporator. By rotating the rotary shutter of an oil deposition device provided with a cylindrical rotary shutter, the dielectric film is deposited with oil at regular intervals, and then an electrode material is deposited, The production of a metallized film capacitor is characterized in that a metallized film is formed in which insulating parts or high resistance parts are formed at regular intervals, and the metallized film is further wound or laminated to constitute a capacitor element. Method.