JPS5897823A - Method of producing metallized film condenser - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a metallized film capacitor, which is composed of multiple layers, by winding or laminating metallized films in which metal electrodes are formed by vapor deposition or the like on the surface of a dielectric film. It is.

Conventionally, metallized film capacitors have been fabricated using a VJ process as described below. First, as shown in FIG. 1, metal electrodes 2 made of aluminum, zinc, etc. are deposited on both sides of a dielectric film 1 such as a polypropylene film, a polyether film, or a polycarbonate film in the width direction of the dielectric film 10 by vacuum evaporation or the like. 111 at the end of
A double-sided metallized film is obtained by providing and forming a non-metalized portion 3 of about El11 to 6111 m, and after applying a dielectric layer 4 of polycarbonate, acetyl cellulose, etc. to both sides of the metallized film, This is wound, and then zinc and tin are applied to both end faces of the wound element.

A metal material such as copper or lead is thermally sprayed to form an electrode lead-out part 6, and a lead wire 6 is connected to the electrode lead-out part 6 by welding or the like to obtain a capacitor element, and a suitable exterior is applied to the capacitor element. A capacitor is obtained by applying

In addition to such wound-type capacitors, many multilayer capacitors are also produced, and in this case, the method of manufacturing is often used by winding it around a bobbin and then cutting it. The structure is the same as the spindle type.

By the way, in the metallized film capacitor manufactured in this way, the non-metalized portion 3 is used for the purpose of preventing the metal electrode 2 from coming into contact with the electrode extension part 6 on the opposite side when the electrode extension part 6 is formed. shall be established;
This non-metalized portion 3 needs to have insulating properties that can withstand the voltage applied when the capacitor is used. Due to this requirement for insulation, in conventional film capacitors, even those with low rated voltages, the width of the non-metalized portion is generally about 1.0 mm.

However, this non-metalized portion 3 does not contribute to the capacitance of the capacitor at all and is a loss portion. Therefore, in the case of a capacitor in which the width of the metal electrode 2 contributing to the capacitance, that is, the width of the counter electrode is relatively large, the width of the non-metalized portion 3 is not an important issue, but the width of the counter electrode In the case of capacitors with small capacitors, important issues arise in terms of material costs and the shape of the capacitor.

By the way, the formation of the non-metal evaporated part as the non-metalized part is carried out during the evaporation process by continuously performing metal evaporation on the evaporation substrate, and while forming the non-metal evaporation part in the necessary parts. There is a need to progress.

To address this need, there are known tape mask methods in which the necessary portions as non-metal vapor deposition portions are covered with tape and oil mask methods in which oil is applied to the necessary portions.

However, in the tape mask method, the heat-resistant tape is moved to cover the required area, and the vapor-deposited metal is attached to the heat-resistant tape to obtain the required area, so the width of the tape is To withstand mechanical strength,
Generally, two or more questions are required, and since the tape is moving, the accuracy of the non-metal deposition part is ±0.6rrr.
It is difficult to form a non-metal deposited part with an extremely narrow width of 1 inch or less using a tape method.

On the other hand, in the oil mask method, when performing metal vapor deposition, oil is injected onto the film from the nozzle of an oil evaporator onto the non-metal vapor deposition area that needs to be deposited in advance, and the metal vapor that has been vapor deposited is deposited on the film. This method takes advantage of the fact that it cannot form a film. In addition, in this method, most of the oil adhering to the film evaporates in a vacuum apparatus that performs metal vapor deposition.

However, the minimum width of the nonmetal evaporated part obtained by this oil mask method is about 1rIrln, and 300 μm.
The present invention was made with the aim of solving the problem of this oil mask method. The purpose of the present invention is to provide a manufacturing method that allows the formation of.

That is, the present invention is characterized in that an appropriate amount of oil that prevents the formation of vapor-deposited metal nuclei is left behind without being evaporated during metal vapor deposition, thereby forming a non-metal vapor-deposited portion with an extremely narrow width. It is. Hereinafter, a more detailed explanation will be given based on specific examples.

On a polyethylene terephthalate film T having a thickness of 3.6 μm, aluminum was vacuum-deposited to a thickness of 300 μm to 300 μm using a vacuum deposition machine shown in FIG. At this time, the polyethylene terephthalate film 7 is unwound from the take-up shaft 8 and fed sequentially through rollers, and the insulating oil sprayed from the nozzle of the oil evaporator 9 reaches 200 to 300 ml.
After being deposited to a thickness of 0.00 mm, it is cooled from the back side in a cooling can 1o. And another cooling camp 1
1, while being cooled from the back side, aluminum evaporated from the evaporation source 12 is vapor-deposited and then wound onto the take-up shaft 13.

Here, it is preferable that the talling can 10.11 be as low temperature as possible.

FIG. 3 shows a portion of a metallized film deposited by the method of the invention before being wound onto a winding shaft 13;
In FIG. 3, 14 is the 'n'# aluminum vapor deposited on the polyethylene terephthalate film 7, 16 is the non-metalized portion, and 16 is before the residue.

Here, FIGS. 4 to 6 show a comparison of the non-metalized portions of the metallized film obtained by the conventional oil mask method and the metalized film obtained by the method of the present invention. In addition,
In FIGS. 4 to 6, B is the dimension of the nozzle discharge port of the oil evaporator 9, and B is the dimension of the vapor deposition blur around the non-metalized portion 16 after vapor deposition.

Further, FIG. 7 shows the relationship between the amount of residual oil in the non-metalized portion 16 and the size of the vapor deposition blur.

Figure 4 shows the conventional method of vapor deposition without cooling using a cooling can, and the amount of residual oil in the non-metalized part 15 is in the thickness range of 0 to 60 mm. It became. The size of the vapor deposition blur is about 300 μm as shown in FIG.

FIG. 6 shows a method according to the present invention in which insulating oil is sprayed onto a polyethylene terephthalate film 7 as a dielectric film from a nozzle of an oil evaporator 9.
The oil was sprayed so as to adhere to the thickness of 2200 mm, and then the oil in the non-metalized portion 15 was cooled using a cooling can 10° 11. At this time, cooling can 1
As mentioned above, the temperature of 0.11 is preferably as low as possible, and the experiments were conducted at temperatures of -20'C to -40C.

Also, if the cooling capacity of the cooling can 11 is sufficient,
Even if the cooling can 1o is omitted, the same effect can be obtained. Furthermore, the amount of injection from the oil evaporator 9 and the temperature of the cooling can 10.11 were adjusted so that the amount of residual oil in the non-metalized portion 16 after metal deposition was 150 to 2000.

In this way, when the residual oil has a thickness of 150 to 200 mm, the vapor deposition blur becomes very small, as shown in Figure 7.
The non-metallized portion 16 can be made identical to the nozzle width of the oil evaporator 9. Here, from the nozzle of the oil evaporator 9, the polyethylene terephthalate film 7 as the evaporation substrate is
In order to deposit oil with a uniform thickness on the surface, it is better to bring the polyethylene terephthalate film 7 into contact with the nozzle of the oil evaporator 9. Furthermore, according to the experiment, the nozzle width o, 0
It was possible to form the non-metalized portion 16 up to 6rIrln.

Furthermore, FIG. 6 shows a case where the residual oil in the non-metallized portion 16 exceeds the thickness of 2,000 people in the method according to the present invention. If the thickness is exceeded, vapor deposition blur will occur. If this is the case,
This is because the amount of injection from the nozzle of the oil evaporator 9 was too large, causing the oil to spread laterally and causing vapor deposition blur.

As described above, according to the method for producing a metallized film capacitor of the present invention, the evaporation substrate is brought into contact with the nozzle of the oil evaporator, and the non-metalized portion is cooled before or during passing over the metal evaporator. Residual oil in non-metallized parts i150 people ~
By adjusting to 200OA, it is possible to form a non-metallic part with an extremely narrow width, that is, the width of the non-metallic part can be made much narrower than the conventional one, and the loss of capacitance in the non-metallic part is reduced. It is possible to obtain a smaller capacitor with a significantly smaller amount.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the schematic structure of a conventional metallized film capacitor, and FIG. 2 is an example of a vacuum evaporation machine used to manufacture a metallized film in the method for manufacturing a metalized film capacitor according to the present invention. 3 is a cross-sectional view showing an example of a metallized film obtained by the same method, FIG. 4 is a cross-sectional view showing essential parts of an example of a metallized film obtained by a conventional manufacturing method, and FIG. The figure is a sectional view showing the main part of the metallized film obtained by the method of the present invention, and Figure 6 shows the structure of the main part of the metallized film when the residual oil amount is not set to a predetermined value in the method of the present invention. The cross-sectional view shown in FIG. 7 is a diagram showing the relationship between the amount of residual oil in the metallized film and the size of the vapor deposition blur in the method of the present invention. 7... Polyethylene phthalate film, 10.11... Cooling can, 14. Mountain... Metal electrode, 15... Non-metalized part, 16.
...Residual oil. Name of agent: Patent attorney Toshio Nakao and 1 other person
11!1 Figure 2 31! l1 7 15 14 Fig. 5 Δ *6 Fig. 7 (A) □

Claims (1)

[Claims] When a metallized film is obtained by forming a non-metalized part by an oil mask method, the film is cooled before or when the non-metalized part of the metallized film passes over a metal evaporator, and residual oil is removed. A method for manufacturing a metallized film capacitor, characterized in that the amount is 150 to 2000 times thick.