JPS61119023A - Metalized plastic film capacitor - 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 Field of the Invention The present invention relates to a metallized plastic film condenser which is a plastic film subjected to metal vapor deposition and used as an electrode.

The structure of the conventional example and its problems The conventional metallized plastic film capacitor is
As shown in the figure, one side (even both sides) of an organic film 1 made of polyethylene terephthalate, polypropylene, etc.
, b), aluminum, nickel or zinc is deposited by fresh air vapor deposition to form the electrode 2, and this metallized plastic film is laminated or wound appropriately according to the electrostatic capacity of the capacitor. ,
It is manufactured by thermally spraying solder or the like to form the electrode lead-out part 3, welding or soldering a lead wire (not shown) thereto, and covering this with resin. The electrode extension portion 3 is made of one or more layers of sprayed metal.

Conventionally, in the case of a single-layer electrode lead-out section 3 made of an aluminum/copper alloy, it was difficult to weld the lead wires, and a special soldering method was required. Therefore, we sprayed solder onto the aluminum/copper alloy to create two layers, making it possible to weld the lead wires. However, as shown in FIG. 2, the electrode extension part 3 in which the first layer 4 is thermally sprayed with an aluminum-copper alloy and the second layer 5 is thermally sprayed with solder is a bond between the first layer 4 and the second layer 5. There is a large variation in power. If a lead wire is welded to such an electrode extension part 3, the bonding surface between the first M4 and the second layer 5 may peel off due to the shock of welding, and if the welding conditions are lowered to prevent this peeling, the lead wire and the second layer may peel off. The welding strength with the layer sprayed metal is very weak, and the lead wire can come off in subsequent processes, resulting in 30-40% disconnection failures! It had a big problem in terms of Qm.

Purpose of the Invention The present invention strengthens the bonding strength between the layers, which was a problem when two layers of aluminum/copper alloy were sprayed with solder on the electrode lead-out portions of metallized plastic film capacitors as described above. The object of the present invention is to provide a metallized plastic film capacitor that can strengthen welding strength with two layers of thermal sprayed metal.

Structure of the Invention In order to achieve the above-mentioned object, the present invention provides an intermediate layer made by alloying the dissimilar metals or alloys sti of the electrode lead-out portion formed by thermal spraying two or more types of metals or alloy layers. For example, an aluminum/copper alloy is thermally sprayed to form the first layer, then an aluminum/copper alloy and solder are simultaneously thermally sprayed to form an intermediate layer, and after #l, solder is thermally sprayed to form the first layer. Either two layers are formed, or an alloy of these components is thermally sprayed to form an intermediate layer.

With this configuration, in the first step, the aluminum-copper alloy is thermally sprayed to firmly contact the metallized plastic fill, and in the next step, the first thermal-sprayed metal, the aluminum-copper alloy, and the 211th thermal-sprayed metal are sprayed. By thermal spraying a certain solder at the same time or as an alloy of these components, the 11th! An intermediate layer is formed in which the l sprayed metal and the second layer sprayed metal are mixed and have a strong bond with the eleventh sprayed metal,
By thermally spraying solder in the most invasive step, a layer 211 having strong bonding with the intermediate layer is formed, and an electrode lead-out portion as a capacitor is formed. Therefore, the first
It is possible to obtain an electrode lead-out portion in which the layer sprayed metal and the second layer sprayed metal are strongly bonded. Further, since the bond between the first layer and the second layer is strong, the lead wire can be strongly welded, and the strength of the lead wire can be increased.

Furthermore, in the case where it is necessary to thermally spray a metal of 2vA or more to the electrode lead-out part, and even when a metal other than the above is used and the bonding force between each layer is small, the mixed thermally sprayed intermediate layer of each layer can be formed. By doing so, the bonding force between layers can be strengthened.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Second
The figure shows a cross-sectional view of a metallized plastic film capacitor according to the invention. 400^ by electron beam evaporation method on a 1.5 μm polyethylene terephthalate film 11.
A nickel electrode 12 having a thickness of 0.5 mm is formed, and the metallized plastic films are laminated with a 0.5 mm offset. The nickel electrode 12 may be formed on one or both sides of the film 11. Then, a pair of electrode extraction surfaces are made of aluminum.
Copper alloy (AQ: 8-12%) is gas sprayed to a thickness of 0.
A first thermal sprayed metal layer 14 of 1 mm thickness is formed, and then an intermediate layer 16 of 0.1 mm is formed by simultaneous thermal spraying under conditions such that aluminum-copper alloy and solder are mixed at 50 percent by weight. Solder was arc sprayed onto layer 16 to form a second sprayed gold layer 15 of 015III11.

Through these steps, the electrode lead part 1 of 0.711111
3 is formed. Next, a solder-coated copper wire (not shown) with a diameter of 0.45 mm is attached to the second sprayed metal 1i15 with a diameter of 0.2~0.
．． Welded it so that it cut in about 3mm.

The tensile strength of this welded lead wire is 0.8 to 9 or more, and all of the fractures occurred between the lead wire and the second sprayed metal layer, and the fracture occurred between the first welded metal layer and the second sprayed metal layer. No destruction occurred between the layers.

Effects of the Invention As described above, according to the present invention, metallized plastic film (
When the electrode extension part of a lumen capacitor is formed by thermal spraying two or more layers of metal, it is possible to obtain a metallized plastic film capacitor with an electrode extension part with strong bonding strength between each layer, and the reliability of welding is improved. This can improve the productivity of capacitors.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a metallized plastic film, C lumen capacitor according to the present invention, and FIG. 2 is a sectional view of a conventional metallized plastic film capacitor. 11...Polyethylene terephthalate film, 12
... Nickel electrode, 13... Electrode extraction part, 14.
...First sprayed metal layer, 15...Second sprayed gold R layer, 16
...Middle layer agent Yoshihiro Morimoto Figure 1 Figure 2

Claims (1)

[Scope of Claims] Metallization in which an intermediate layer made of an alloy of these components is provided between the dissimilar metal or alloy layers of the electrode lead-out portion formed by thermal spraying one or more types of metal or alloy layers. plastic film capacitor. 2. The sprayed metal that forms the electrode extension part is aluminum.
2. A metallized plastic film capacitor according to claim 1, wherein the intermediate layer is made of a copper alloy and a solder, and the intermediate layer is formed by simultaneously spraying and mixing the aluminum-copper alloy and the solder.