JPH0770429B2 - Laminated film capacitor and manufacturing method thereof - Google Patents

Description

TECHNICAL FIELD The present invention relates to a laminated film capacitor having a capacitor element formed by winding or laminating a metallized plastic film, and a method for manufacturing the same.

[Prior Art] When manufacturing an element in a laminated film capacitor as described above, in general, a mother element is once formed, and end face electrodes are formed on both side surfaces of the mother element with a sprayed metal or the like (metallikon). The mother element is finely cut to form each individual unit capacitor element.

By the way, when manufacturing such a capacitor element, conventionally, as shown in FIG. 5, a metallized film a to be a mother element is wound or laminated on the upper and lower surfaces of the metallized film a which are stacked in multiple layers. A thin material b such as a raw film having the same thickness or substantially the same thickness as the raw material is further stacked and fixed in multiple layers to have a predetermined strength and the same expansion / contraction ratio as that of the element to form a capacitor element c. In the figure, d is a metallikon layer and e is a lead wire.

[Problems to be Solved by the Invention] However, in the case of the protective material b using a thin film as thin as the metallized film a as in the prior art, the protective material b is rolled up or laminated in several layers in order to be superposed. In addition to requiring a long working time, a large amount of specially-made expensive material b is required, which causes a problem that the material cost is increased and the cost is increased.

Therefore, the present invention has been made in view of the problems as described above, and can reduce the working time, and further, by using paper or the like whose material cost is extremely low as a cover sheet,
An object of the present invention is to provide a laminated film capacitor which is extremely robust in structure and a method for manufacturing the same.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a cover sheet on the upper and lower surfaces of a capacitor element formed by winding or laminating a metallized film, and electrodes on the side surface made of a sprayed metal. In the laminated film capacitor including the above, the cover sheet is made of a non-stretchable resin absorbing member, and the cover sheet itself is also impregnated with the resin.

[Working] By using a resin absorbing member such as paper as a cover sheet, when it is attached to the upper and lower surfaces of the metallized film layer, it is a flexible material, so it can be easily attached.
Further, when the resin is hardened after impregnated with the resin, the metallized film and the cover sheet are integrated with each other, so that the laminated film capacitor can be easily and firmly formed.

Embodiments of the present invention will be described below with reference to the drawings.

[Examples] FIG. 1 is an external view of an element of a laminated film capacitor formed by the manufacturing method of the present invention.
The figure shows a cross-sectional view taken along the line X--X in FIG.

In these figures, 1 is a metallized film, 2 is a cover sheet, 3 is a metallikon electrode layer, and 4 is a lead wire.

The metallized film 1 has a thickness of 1.5 to 5.0 μm and a width, for example.
A 4.5 mm thick metallized polyethylene terephthalate film with aluminum vapor deposited on one side is laminated in multiple layers to form a capacitor element.

The cover sheet 2 has a thickness of about 0.1 to 0.5 mm and is made of non-stretchable paper having the same size as the width of the metallized film, and is fixed to the upper and lower surfaces of the metallized film layer.

The metallikon electrode layer 3 is made of a metal containing tin, zinc or the like as a component, and as shown in FIG. 3, by spraying the metal on both side surfaces of the mother element 5 at the stage of forming the mother element 5. Has been formed. The lead wires 4 are welded to the metallikon electrode layer 3, respectively.

Further, the metallized film layer and the cover sheet 2 are impregnated with a curable resin 6, and when the resin 6 is cured, the respective constituent members are integrated to form a robust capacitor.

Next, a method of manufacturing the laminated film capacitor configured as described above will be described.

First, in the case of forming the mother element 5, the long metallized films 1 constituting the two unit electrodes are superposed and wound in a multi-layer on a winding frame (not shown) to form a laminated body as shown in FIG. Form 7. At this time, the cover sheet 2 having the same width as that of the metallized film 1 is wound at the beginning and the end of winding of the metallized film layers to be laminated. Since the cover sheet 2 is a paper material, it has flexibility, is easy to wind, and is easily adapted to the film. Then, after pressing the completed laminated body 7 with an appropriate pressure, or before that, on both sides of the laminated body 7, a metallikon electrode layer 3 is provided by a sprayed metal as shown in FIG. Form.

Next, as shown by the broken line in FIG.
One individual small element is cut to form a unit capacitor element. Then, the lead wire 4 is welded to the metallikon electrode layers 3 on both end faces of each unit capacitor element.

After that, in order to impregnate each small element with vacuum, for example, it is immersed in a thermosetting resin tank (not shown) in a vacuum or normal pressure for a predetermined time, pulled up, and then heated and cured to cover it. The sheet 2 and the metallized film layer are firmly integrated. Furthermore, a laminated film capacitor can be completed by applying an exterior resin by an appropriate method.

In the above examples, the case of thermosetting as the impregnating resin has been described, but in addition to the above, an epoxy resin having both UV curability or both heat and UV properties, further electron beam curability, etc. It may be a resin. Further, in the above-described embodiment, the case where the cover sheet 2 is made of paper has been described, but other similar materials may be used as long as they are non-stretchable resin absorbing members. Furthermore, in the above embodiment, the case of the lead-out lead type has been described, but it is of course applicable to the chip type without lead wire.

[Effects of the Present Invention] As described above, in the laminated film capacitor and the method for manufacturing the same according to the present invention, the non-stretchable resin absorbent member such as paper is applied to the cover sheet. You don't have to stack multiple layers, and work time can be shortened. Further, a protective body adapted to the metallized film layer can be formed without using a special expensive cover sheet (protective film), and the cost can be reduced. On the other hand, in terms of structure, by impregnating with a resin, the cover sheet, which had been bendable and flexible until then, was transformed into a strong one together with the metallized film layer and integrated with the metallized film layer to form a robust element. It is an invention which has an advantage that a can be formed.

[Brief description of drawings]

FIG. 1 is an external perspective view showing an element of the laminated film capacitor of the present invention, FIG. 2 is a sectional view taken along the line XX in FIG. 1, and FIG.
FIG. 4 is a partially enlarged perspective view showing a mother element in the manufacturing process of the present invention, FIG. 4 is a partially enlarged perspective view before the same metallikon, and FIG.
The figure shows a partially enlarged cross-sectional view of a conventional laminated film capacitor. In the figure, 1 is a metallized film, 2 is a cover sheet,
3 is a metallikon electrode layer, 4 is a lead wire, and 5 is a mother element.

Claims (2)

[Claims] 1. A laminated film capacitor having a cover sheet on the upper and lower surfaces of a capacitor element formed by winding or laminating a metallized film, and electrodes on the side surface made of a sprayed metal, wherein the cover sheet is non-stretchable. The laminated film capacitor, which is made of the resin-absorbing member, and whose cover sheet itself is also impregnated with resin together with the element. 2. A metallized film is wound or laminated to form a capacitor mother element, and a cover sheet made of a non-stretchable resin absorbing member is fixed to the upper and lower surfaces of the mother element, and
After forming an electrode by applying a sprayed metal to the side surface of the mother element, before or after cutting into individual small elements, after impregnating the cover sheet itself together with the element body with resin, resin hardening And a method for manufacturing a laminated film capacitor.