JP2500866B2 - Multilayer film capacitor and manufacturing method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated film capacitor having an adhesive property effective for improving the manufacturing process and self-healing property, and a manufacturing method thereof.

[0002]

2. Description of the Related Art In recent years, the progress of electronic technology has been remarkable, and electric equipment and electronic equipment using the electronic technology have become more multifunctional and smaller. There is a strong demand for development of high-density packaging technology for miniaturization of these devices and miniaturization of components constituting circuits. This tendency is particularly strong for resistors, capacitors, coils, etc. used as individual parts. To meet this demand, the structure of the organic film capacitor is shifting from the winding type the stacking type film capacitor multilayer type being practically used to form a metal thin film layer on the surface as shown in FIG. 4 longitudinally After laminating the necessary number of layers of wide polymer dielectric film with a continuous margin, slit in the longitudinal direction, form the extraction electrode by metallikon on the slit surface, and further cut in the width direction. The capacitor has a structure as shown in. 4 and 5, 1
Is a polymer dielectric film, 2 is a metal thin film layer, 3 is a margin portion, and 4 is an extraction electrode made of metallikon. The polymer dielectric film 1 includes polyethylene terephthalate (PET) and polyphenylene sulfide (PPS).
However, aluminum by vacuum deposition is usually used for the metal thin film layer 2, and an alloy containing copper as the main component is usually used for the metallikon. Further, as a method of providing the margin portion 3, oil vapor is applied to the surface of the polymer dielectric film 1 at a constant interval and a constant width during vacuum vapor deposition to form the metal thin film layer 2
The margin portion 3 which is a portion in which the above is not formed is provided.

[0003]

In the film capacitor having the above structure, since the laminated polymer dielectric films are bonded only by heat and pressure, the mechanical strength of the slit strip as shown in FIG. When the width was weak, particularly when the width of the strip became narrow, there were problems such as the strip being broken during the manufacturing process and the laminated metallized film being peeled off.

It is an object of the present invention to provide a film capacitor having a good insulation self-healing property without problems such as breakage of the strip during the manufacturing process.

[0005]

Means for Solving the Problems The present invention to achieve the above object, Rutotomoni provided an adhesive layer to express adhesiveness upon heating on the surface of the dielectric polymer film, the adhesive
A metal thin film layer is provided as a metallized film such that part or multiple parts of the adhesive layer on the surface of the adhesive layer is exposed, the
Laminate the metallized films and place them adjacent to each other by heating .
The metallized films are bonded together by an adhesive layer .

Further, an adhesive layer, which exhibits adhesiveness by heating, is provided on the surface of the polymer dielectric film, and a paint layer which can be washed off and removed by water is applied only on the exposed portion of the adhesive layer. A metallized film is obtained by forming a thin film layer, followed by washing with water, and removing the paint layer which can be washed off with water and the metal thin film layer on the paint layer.

[0007]

By [action] The present invention is to increase the interlayer adhesion of the metallized film, or broken conditions in the manufacturing process, it does not generate a problem such as metalized film is peeled, moreover the metal thin film in the bonded portion Since there is no layer, the self-healing property is good, and the adhesive portion can be shared with the margin portion.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

[0009] Figure 1 is a structural view of a capacitor according to an embodiment of the present invention, the dielectric polymer film 1, and the adhesive layer 5 which exhibits adhesiveness with the metal thin film layer 2 are sequentially formed by heating, and A part of the adhesive layer exposed from the margin portion of the metal thin film layer 2 adheres to the back surface of the polymer dielectric film 1 to be laminated . The margin portions 5a are alternately provided so that they are at the same position in every other layer.

2 and 3 are cross-sectional views showing the process of forming the constituent elements of the capacitor of the present invention. In FIG. 2, a polyphenylene sulfide (PPS) film having a thickness of 4 μm is used as the polymer dielectric film 1 and heated. The adhesive layer exhibiting adhesiveness is formed by coating a coating composition of the following composition A with a roll coater so that the dry thickness becomes 0.1 μm. ．
The metal thin film layer 2 is formed by coating so as to have a thickness of 5 μm and a width of 0.3 mm.
It was formed to have a thickness of 0 angstrom.

Composition A paint Polyacrylate ester resin 10 parts Isopropyl alcohol 40 parts Water 50 parts Composition B paint polyvinyl alcohol resin 100 parts Calcium carbonate fine powder 20 parts Surfactant 1 part Water 500 parts FIG. 3 shows a metal thin film layer This is a state in which the metal thin film layer 2 is partially removed together with the paint layer 6 which can be removed by washing with water after sequentially forming up to 2. The exposed portion of the adhesive layer 5 serves as an adhesive portion between layers and also serves as a margin portion used in a normal capacitor.

The metallized film thus obtained was laminated so that the exposed portions of the adhesive layer were alternately located at the same position, slitted to a width of 4 mm, and extraction electrodes made of metallikon were provided on both sides of the slit surface. A capacitor was prepared by cutting the strip to a predetermined size in a direction perpendicular to the longitudinal direction.

When the self-healing property of the capacitors prepared in the examples was evaluated by a predetermined method, the self-healing property was recognized in all 100 samples. In addition, breakage of slit lines and peeling between layers of the laminated film were not observed during the manufacturing process.

COMPARATIVE EXAMPLE 1 As Comparative Example 1, a metallized film having a metal thin film layer formed on the surface of a polymer dielectric film was laminated and heated without providing an adhesive layer for adhesion between layers of the metallized film. ， Pressurize,
A capacitor having a structure as shown in FIG. 5 was prepared in the same manner as in Example 1 below. The margin portion was formed by irradiating a laser after forming a metal thin film layer on the surface of the polymer dielectric film.

When the capacitor prepared in Comparative Example 1 was evaluated, all 100 samples were found to have self-healing properties, but slits were formed during the manufacturing process due to weak adhesion between the laminated metallized films. Strips were broken and delamination of the laminated film was also observed, and the yield was about 60% due to these defects.

Comparative Example 2 As Comparative Example 2, a metal thin film layer is formed on the surface of a polymer dielectric film, and a metal thin film layer having a margin portion formed by irradiating a laser and the entire surface of the margin portion are bonded with the following composition. Dry the agent solution with a roll coater to a thickness of 0.1μ
After coating and drying so as to have a thickness of m, lamination, heating and pressurization were performed, and a capacitor was prepared in the same manner as in Example 1 below.

Composition of Adhesive Solution Polyacrylic ester resin 3 parts Isopropyl alcohol 40 parts Water 50 parts The capacitor prepared in Comparative Example 2 was evaluated.
Defects due to insufficient adhesive strength between layers such as folds in the process and peeling between layers were not observed, but the self-healing property was 10
Not found in all 0 samples.

In addition to polyphenylene sulfide as the polymer dielectric film in the present invention, polyethylene terephthalate, polypropylene, polyethylene naphthalate, etc. are used as the material of the adhesive layer which exhibits adhesiveness by heating. Other than ethylene vinyl acetate-based, polyurethane-based, polyester-based heat-melting resins, thermoplastic resins and other adhesives, and as a paint that can be removed by washing with water, a water-soluble paint other than those of the examples, and a metal thin film As the layer, in addition to aluminum, a single layer thin film of a single or mixed metal such as tin, nickel, zinc, chromium, copper, gold and silver, or a laminated thin film may be used. The size and shape are not limited to those in the embodiment. In addition, for the self-healing property of insulation,
It is better not to form the adhesive layer on the metal thin film layer portion, and it is desirable to form the adhesive layer on the margin portion as in the embodiment. However, depending on the thickness of the dielectric film and the forming conditions of the metal thin film electrode, the adhesive layer may be formed. It is possible to obtain a capacitor having a performance that does not hinder practical use even if the layer and the metal thin film layer partially overlap.

[0019]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, the surface of the polymer dielectric film is provided with an adhesive layer which exhibits adhesiveness by heating, and a part or plural parts of the adhesive layer are exposed on the surface. As described above, metallized films provided with metal thin film layers are laminated, and part or multiple parts of each layer are adhered by heating, and there is no crease or delamination of the metallized film during the manufacturing process. Therefore, it is possible to produce a capacitor having a good self-healing property with a high yield without deteriorating the capacitor characteristics.

[Brief description of drawings]

FIG. 1 is a structural diagram of a laminated film capacitor according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a metallized film used in the film capacitor of the present invention before washing with water.

FIG. 3 is a cross-sectional view after the water washing process.

FIG. 4 is a state diagram in which laminated metallized films are slit into strips.

FIG. 5 is a structural diagram of a conventional laminated film capacitor.

[Explanation of symbols]

 1 Polymer Dielectric Film 2 Metal Thin Film Layer 4 Extraction Electrode 5 Adhesive Layer 5a Margin 6 Paint Layer Removable by Washing

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location H01G 4/18 B29L 9:00 // B29L 9:00 7924-5E H01G 4/24 321D (56) References Japanese Unexamined Patent Publication No. 50-153269 (JP, A) Actual Development 48-110637 (JP, U) Japanese Patent Publication 43-9336 (JP, B1) Actual Publication 44-10220 (JP, Y1)

Claims (3)

(57) [Claims] 1. A Rutotomoni provided an adhesive layer expresses adhesiveness by heating the surface of the polymer dielectric film, the contact
A metal thin film layer is provided on the surface of the adhesive layer so that a part or a plurality of parts of the adhesive layer are exposed to form a metallized film , and
Laminate the metallized films and place them adjacent to each other by heating .
A laminated film capacitor in which metallized films are bonded together with an adhesive layer . 2. The laminated film capacitor according to claim 1 , wherein the exposed portions of the adhesive layer are provided so that they are in the same position every other layer during lamination. 3. An adhesive layer, which exhibits adhesiveness when heated, is provided on the surface of a polymer dielectric film, and a paint layer which can be washed off and removed is partially formed on the adhesive layer , and then the paint.
Including a layer of metallic thin film layer provided on the adhesive layer, the claims have configured metallized film by removing the metal thin film layer on the paint layer with subsequent the washing removable coating layer by washing with water 1. The method for manufacturing the laminated film capacitor as described in 1 .