JPH06251992A - Manufacture of film capacitor - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a method for manufacturing a laminated film capacitor, which solves problems such as productivity and material loss. [Structure] After winding a predetermined number of turns around a cylindrical bobbin using two metallized films or a metallized film and a polymer film (a film that is not metallized), the film is wound at one point on the outer circumference of the wound film. After cutting the wound body into a flat plate shape by cutting in the width direction to form a laminated body, the laminated body is longitudinally aligned along a predetermined process,
By slitting in the width direction, a laminated type film capacitor is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a film capacitor using a polymer film as a dielectric.
The obtained film capacitor is combined with other electronic components to form an electronic circuit and an electric circuit, and is used for an electronic device, an electric device and the like.

[0002]

2. Description of the Related Art In recent years, the development of electric and electronic circuits has been remarkably used widely in various fields, regardless of consumer and industrial fields. Electronic components make up these electric and electronic circuits. Electronic parts are required to have unique characteristics according to the purpose of use, but with the miniaturization and higher performance of electronic and electrical equipment, the shape of electronic parts must be downsized and high performance is required. Has become. Furthermore, there is a strong demand for product price reduction, and it is becoming difficult to meet these demands by the conventional film capacitor manufacturing method.

As an example of a conventional method of manufacturing a laminated type film capacitor, a combination of a metallized film and a polymer film cut into the width of the capacitor to be obtained in a large diameter cylindrical drum is wound. A method of obtaining a laminated capacitor by subjecting a thing to a metallikon electrode treatment and then cutting and dividing it in a circular shape, or a film which is wound on a rotating flat plate with a combination of a metallized film and a polymer film, and then wound on both ends of the flat plate. A method has been proposed in which the laminate is cut to obtain two laminates.

8 to 10 show an example of a conventional method of manufacturing a laminated type film capacitor.

In FIG. 8, a metallized film 3 wound on the unwinding shaft 1 and having a predetermined margin formed on both sides, and a polymer film 4 unwound from the unwinding shaft 2 in the A and B directions, respectively. After advancing through the free rolls 5, the free rolls 6 are combined and wound on the flat plate 7. The flat plate 7 rotates in the C direction to form a wound laminated body 8. Thereafter, the wound laminated body 8 formed on the flat plate 7 is heat pressed to bond the film layers.

Next, as shown in FIG. 9, both end portions 10 of the flat plate 7 are
Laminated body 1 of the corner portion 9 and the straight portion cut by the portion
It is divided into 1. At this time, the corner portions 9, which are normally discarded, occur at both ends. The ratio of the laminate 11 to the corner portion 9 changes depending on the length of the flat plate 7 in the longitudinal direction, and the longer the flat plate 7 is, the better the material yield. However, the longer the flat plate 7 is, the wrinkle at the time of winding the film is increased. An appropriate length of about 200 to 500 (mm) is selected because problems such as bending and streaks occur.

The laminated body 11 thus obtained is shown in FIG.
As shown in FIG. 5, the mother element 14 of the multilayer capacitor is obtained by cutting along the dotted lines 12 and 13.

[0008]

However, in such a manufacturing method, when the film is wound on a flat plate, the tension applied to the film changes, so that the film wound on the flat plate is likely to have wrinkles. It was difficult to increase the productivity by increasing the lengthwise direction or increasing the rotation speed. Further, in order to obtain the laminated body 11 of the linear portion from the wound laminated body 8, since the cutting is performed at two positions before and after, and the corner portion is discarded, the material loss of the film is large.

It is an object of the present invention to improve the precision and stability of a laminated type film capacitor product, improve the product yield, and reduce waste loss of film material to effectively utilize resources.

[0010]

In order to achieve this object, a method of manufacturing a film capacitor according to the present invention uses two metallized films or a combination of a metallized film and a polymer film on the outer periphery of a large-diameter cylindrical core. After being wound, the wound film is spread in a flat plate shape to obtain a laminate.

[0011]

With this structure, two metallized films or a metallized film and a polymer film are wound around the outer periphery of a large-diameter cylindrical core, so that the fluctuation of tension applied to the film during winding is small and the winding speed is high. Even if the metallized film or the polymer film is difficult to be wrinkled or bent, and the wound body is flattened, only one cut is made in the width direction, so that the loss of material is reduced.

[0012]

EXAMPLES Examples will be given to explain the present invention in detail. 1 to 7 show an embodiment of the present invention in the order of steps.

FIG. 1 shows a film winding method.
A width 520 on which an aluminum thin film having a predetermined margin is vapor-deposited on both surfaces unwound from the unwinding shaft 30 whose tension is controlled so that the tension is always constant.
mm, thickness 6 μm, metallized film 32 made of polyethylene terephthalate (hereinafter PET) as a dielectric material, and a polymer unwound from an unwinding shaft 31 which is similarly tension-controlled and always controlled to have a constant tension. The polymer film 33 having a width of 520 mm and a thickness of 6 μm and made of PET, which is a film, runs in the D direction and the E direction, passes through the free roll 34, and then passes through the free roll 35 to form the metallized film 3.
Two pieces of the polymer 2 and the polymer film 33 were aligned so that both ends were aligned with each other, and then they were rotated in the F direction on the outer circumference of a cylindrical core 36 having an outer diameter of 250 mm, and wound 100 times to obtain a wound body 37.

At this time, the thickness of the wound body 37 is t = 200 × 6 (μm) = 1.2 (mm) The inner circumference of the wound body 37 is L ₁ = 2π × 125 (mm) The wound body 37 The outer circumference is L ₂ = 2π × (125 + 1.2) (mm) Therefore, the difference between the inner circumference and the outer circumference is L ₂ −L ₁ = 2π × 1.2 (mm) ≈ 7.536 (mm).

A difference of about 7.5 (mm) between the inner circumference and the outer circumference is a portion which is normally discarded because the capacitance changes because the number of layers is different in the thickness (lamination) direction.

Next, FIG. 2 shows a method of developing the wound body 37 obtained in FIG. 1 into a flat plate shape. In FIG. 2, one point 4 of the wound body 37 wound on the outer circumference of the cylindrical core 36 having an outer diameter of 250 mm.
At 0, a film is cut in the width direction of the film. 1 point 4
After cutting 0, one side of the cutting point 40 is opened on the flat metal plate 41, the other side is fixed so as not to be displaced from the cylindrical core 36, and the cylindrical core 36 is rotated in the G direction to rotate the winding body 37.
A flat plate-shaped laminated body 38 was obtained from. This laminated body 38 has 90
Interlayer adhesion between the films is performed by a hot pressing process at 10 ° C. and 10 kgf / cm ² .

FIG. 3 shows the laminated body 38. When the metallized film or film is wound on the outer periphery of the cylindrical core to expand the wound body to obtain a flat laminated body, the laminate of the present invention has inner and outer lengths as shown above. The outer circumference is longer than the inner circumference by 2π times the winding thickness of the film. As shown in FIG. 3, the gap 39 between the inner peripheral length L ₁ and the outer peripheral length L ₂ does not have a constant number of layers and is normally discarded.

FIG. 4 shows a diagram of the discarded portion. The laminated body 38 is cut at a portion 42 corresponding to the inner peripheral length L ₁ shown in FIG. 3 by a cutting machine, and a difference between the inner peripheral length L ₁ and the outer peripheral length L ₂ is a loss portion which cannot be used as a capacitor and becomes waste 43. . In the embodiment of the present invention, the cutting and discarding is performed in the process of FIG. 4, but the waste 43 does not cause any problem in the manufacturing method of the present invention even if it is cut and discarded in the device cutting process after metallikon.

FIG. 5 shows the strip element process of the laminated body 38 obtained in FIG. In FIG. 5, at one point 45 of the laminated body 38, a strip element 46 was obtained by slitting with a rotary blade or a leather blade in the longitudinal direction of the film shown by the broken line. The strip element 46 is the laminated body 3
A plurality of strips can be taken from one laminated body by slitting in the width direction 44 of 8 along the broken line portion.

FIG. 6 shows the metallikon process. Element 46
A metal made of tin, zinc, copper, or the like is sprayed on the slit surface of No. 1 to form the metallikon 47 surface.

FIG. 7 shows the element cutting process. A metal-recon-equipped strip element 50 obtained by subjecting a strip element obtained by slitting from the laminate to a metallicon treatment is cut along a broken line at one point 48 of the metallicon-attached strip element 50 as shown in FIG. I got 49. The multilayer capacitor element 49 is then completed by adding a lead wire and an outer package to complete the multilayer capacitor.

It should be noted that, in the detailed description of the present invention, specific materials, dimensions, and shapes have been described, but the present invention is not limited to these.

Although PET films were used as the dielectric film and the polymer film in the above examples, polypropylene (PP), polyphenylene sulfide (PPS), polyethylene naphthalate (PEN) were used.
You may use any 1 type or 2 types in combination.

[0024]

As described above, according to the method of manufacturing a laminated type film capacitor of the present invention, a metallized film or a polymer film is wound around the outer periphery of a cylindrical core, and the metallized film or polymer film is unrolled to form a flat plate shape. Since the winding operation is smooth to obtain the laminated body, the winding speed is high, and high winding accuracy can be obtained. Effective for improving product yield. Further, according to the present invention, there is little material loss when a capacitor element is manufactured from a flat plate-like laminated body, and the capacitor element can be mass-produced from one flat plate-like laminated body, so that the productivity is high, and accordingly, the laminated type The manufacturing cost of the capacitor element can be reduced, and an inexpensive product can be supplied. On the other hand, the manufacturing method of the laminated type film capacitor of the present invention is an effective method from the viewpoint of effective utilization of resources and reduction of industrial waste.

[Brief description of drawings]

FIG. 1 is an explanatory view of a film winding method in a method of manufacturing a film capacitor according to an embodiment of the present invention.

FIG. 2 is a diagram showing a process of developing a wound film into a flat plate laminate.

FIG. 3 is a perspective view of a flat plate laminate unfolded from a wound film.

FIG. 4 is a process diagram for obtaining a multilayer capacitor from a flat plate laminate.

FIG. 5: Process drawing for obtaining strip elements from a flat plate laminate

FIG. 6 is a perspective view of a strip element having a slit surface provided with a metallikon surface.

FIG. 7: Process drawing for obtaining a multilayer capacitor from a strip element

FIG. 8 is an explanatory view of a conventional method for manufacturing a laminated type film capacitor.

FIG. 9 is an explanatory view showing division of a laminated body in a conventional laminated type film capacitor manufacturing method.

FIG. 10 is an explanatory view of manufacturing a mother element of a multilayer capacitor in a conventional method of manufacturing a multilayer type film capacitor.

[Explanation of symbols]

 30, 31 Unwinding shaft 32 Metallized film 33 Polymer film 34, 35 Free roll 36 Cylindrical core 37 Rolled body 38 Laminated body 39 Displaced part 43 Waste 46 Article element 47 Metallikon 49 Laminated capacitor element

Claims (2)

[Claims] 1. A method of manufacturing a laminated type film capacitor using a polymer film as a dielectric material, wherein a metal thin film is formed such that a predetermined margin is provided on one or both sides of a wide and long polymer film. The metallized film is wound with a combination of the metallized film and a polymer film on which a metal thin film is not formed so as to form a film capacitor structure on the outer surface of the cylindrical bobbin, and then the circumference of the wound film is The above one point is cut in the width direction of the film, the wound body is developed on a flat surface to form a laminated body, and the laminated body is heat-pressed, and then a slit slit process is performed in the longitudinal direction, and the slit surface of the strip. And a step of forming a plurality of capacitor elements by cutting the metallycon electrode-treated strip. And a method for manufacturing a film capacitor. 2. The method for producing a film capacitor according to claim 1, wherein the polymer film is at least one selected from polyethylene terephthalate, polypropylene, polyphenylene sulfide, and polyethylene naphthalate.