JP2002231555A - Rolled film capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolled film capacitor which allows its capacitance to increase and its size to be reduced, using a capacitor metallized film. SOLUTION: The film capacitor comprises a first and second single-side- metallized films laminated one above the other and rolled together. A first metal electrode layer 20 of a metal deposited to a film surface other than a first zigzag surface margin 10 composed of a first margin 11 to a fourth margin 14 and a second tape-like metal electrode layer 30 are laminated on the first and second metallized films, respectively. The films are rolled preferably with a thermally adhesive resin 6 preferably inserted between the films and then heat-pressed to adhere the films.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wound type film capacitor, and more particularly, it is possible to increase the capacitance of a capacitor by making the shape of a margin special, and to reduce the size of the capacitor. TECHNICAL FIELD The present invention relates to a wound film capacitor using a metallized film for a capacitor that can be manufactured.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 8, a first surface margin 101 having a predetermined width is formed of a band-shaped plastic film (hereinafter, may be simply referred to as "film" in this specification). One end of the surface (upper side of the drawing)
And a similar backside margin 102 is provided on the other end side (lower side in the drawing) of the backside of the film, and metal is sequentially deposited on portions other than the front / backside margins 101 and 102 to form electrodes. The resulting metallized films for capacitors are known. Such a metallized film for a capacitor is cut in accordance with the desired characteristics of the capacitor such as capacitance, and then wound to form a wound film capacitor.

[0003] When a high voltage is applied to a wound film capacitor, a discharge phenomenon occurs in an air gap between the wound films, which may cause corrosion of the metal electrode layer. To suppress this corrosion, FIG.
(A) As shown in (b), the first surface margin 10
1 is provided in the center of the film surface to divide the electrodes on the film surface, and the back surface margins 102 are provided at both ends of the film back surface, so as to be parallel to the film length direction as shown in FIG. A metallized film for a capacitor in which two series capacitor elements are formed is known. Similar to the capacitor shown in FIG. 8, such a film is also cut in accordance with the desired characteristics of the capacitor such as the capacitance and then wound to form a wound film capacitor. In addition, the first surface margins 101, 10
There is also known a metallized film for a capacitor formed by increasing the number 2 and forming a plurality of series capacitors parallel to the film length direction.

In the above-mentioned metallized film for capacitors, the first surface margins 101 and 102 are provided in the film length direction. However, as shown in FIG. It is also contemplated to split the layers. In the wound film capacitor shown in FIG. 10, three margins 103 are provided on each of the front and back sides, the metal electrode layer is separated into four, and seven series capacitor elements are formed.

By the way, in such a capacitor as described above, in case that those capacitor elements are short-circuited, as shown in FIG. L-shape or T extending from one surface margin 101 to the other end (lower side in the drawing)
A metallized film for a capacitor with a security mechanism in which the width of the metal electrode layer 201 is narrowed in the vicinity of the other end edge by further providing a first surface margin 104 having a U-shape has been devised.
In such a metallized film for a capacitor with a security mechanism, if a capacitor element consisting of two metal electrode layers is short-circuited, the narrowed portion 20
The metal of No. 2 is scattered, and the current flowing to the metal electrode layer 201 is cut off. As a result, even if the capacitor element is short-circuited, the entire element continues to function as a capacitor.

[0006]

If the width of the margin is reduced, a reduction in size and an increase in capacity can be realized. However, a discharge phenomenon is more likely to occur, and at this stage, in order to realize a reduction in size and an increase in capacity. Has reached the stage where the width of the margin cannot be further reduced. on the other hand,
Since the market demands miniaturization and high capacitance of capacitors, it is considered to use a very narrow width film. Occupies a large proportion, and it is difficult to further reduce the size and increase the capacity.

In particular, in the metallized film for a capacitor with a security mechanism as described in paragraph [0005], first L-shaped surface margins 104 and 105 are provided.
Must be provided on the front and back of the film, respectively, and the proportion of the margin occupies more and more. Further, since the first surface margins 104 and 105 must be L-shaped, there is also a problem that the design efficiency is reduced as compared with a normal metallized film for a capacitor.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to increase the capacitance of a capacitor by making the shape of the margin a special shape. An object of the present invention is to provide a wound film capacitor using a metallized film for a capacitor that can be reduced in size.

[0009]

A film capacitor according to the present invention for solving the above-mentioned problems is provided in a strip shape in the film length direction and has a first margin 11 and a first margin at one end of the film having a predetermined length. 11 is a second margin 1 continuously formed in a strip shape in a film width direction substantially perpendicular to the film width direction.
2. A third margin 13 at the other end of the film having a predetermined length, which is formed continuously in a band shape in a film length direction substantially perpendicular to the second margin 12, and a film width substantially perpendicular to the third margin 13 One side on which a first metal electrode layer 20 made of a metal provided on the film surface other than the first surface margin 10 is formed by repeatedly forming a fourth margin 14 continuously formed in a belt-like direction in the film length direction. The metallized first film is provided in a strip shape in the film length direction, and at least a part thereof is provided with the first margin 11 and the third margin.
A single-sided metallized second layer in which a second metal electrode layer 30 made of a metal provided on the film surface other than the second surface margin 31 having a predetermined width overlapping the margin 13 is laminated.
The film is wound by overlapping the film.

The above description of the present invention focuses on the margin 10 as a non-evaporated portion provided on the front and back of the film.
Paying attention to 30, the present invention can also be considered as follows. That is, the film capacitor according to the present invention includes a plurality of one end metal electrode layers 21 extending from one end of the film toward the other end, and a plurality of one end metal electrodes 21 extending from the other end of the film toward one end. A first metal electrode layer 20 including a plurality of other metal electrode layers 22 insulated from the electrode layer is provided between one adjacent one metal electrode layer 21 and one other metal electrode layer 21. A single-sided metallized first film continuously formed on the film surface such that one end-side metal electrode layer 22 is sandwiched between two adjacent other-end-side metal electrode layers 22; One end side metal electrode layer 2
The second metal electrode layer 30 overlapping the first and second-end metal electrode layers 22 is formed by superposing and winding a single-sided metallized second film provided on the film surface.

Another film capacitor according to the present invention that solves the above-mentioned problem is a first metal electrode layer 41 extending from one edge of the film toward the other end, and is insulated from the first metal electrode layer 41. The second metal electrode layer 42 overlaps with the single-sided metalized first film repeatedly provided on the film surface in the film length direction and the first metal electrode layer 41 and the second metal electrode layer 42. The first metal electrode layer 51 provided and the first metal electrode layer
A second metal electrode layer 52 that is insulated from the metal electrode layer 51 and extends from the other end to the one end of the film is repeatedly wound with a single-sided metallized second film provided on the film surface repeatedly. It becomes. Or a first metal electrode layer 71 extending from one edge of the film toward the other end,
A second metal electrode layer 72 insulated from the metal electrode layer 71;
A third metal electrode layer 73 insulated from the first and second metal electrode layers 71 and 72 and extending from the other end of the film toward one end, and the first, second and third metal electrode layers 71 and 72; 7
A single-sided metallized first film in which a fourth metal electrode layer 74 that is insulated from the second and third metal layers is formed adjacently and repeatedly on the film surface adjacent to the film length direction; a first metal electrode layer 71 and a second metal electrode layer The first metal electrode layer 81 provided so as to overlap the second metal electrode layer 72, the second metal electrode layer 72, the third metal electrode layer 73, and the fourth metal electrode layer 74, but are insulated from the first metal electrode layer 81. A second metal electrode layer 82 provided so as to be formed is formed by superposing and winding a single-sided metallized second film repeatedly formed on the film surface adjacent to the film length direction.

Preferably, a heat-adhesive resin layer 6 is formed on the back surface of the single-sided metallized first film and the back surface of the single-sided metallized second film, so that the single-sided metalized first film and the single-sided metallized second film are in close contact with each other. are doing. Examples of such a heat-adhesive resin layer 6 include polyester.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. In the following description, the film length direction is from left to right in the drawing for convenience of description. (Embodiment 1) As shown in FIG. 1, a first surface margin 10 having a predetermined shape is provided on the surface of a single-sided metallized first film in a metallized film for a capacitor according to the present invention. More specifically, the first surface margin 10 includes four margins, is provided in a strip shape in the film length direction, and has a first margin 11 on one end side of the film (upper side in the drawing) having a predetermined length; A second margin 12 continuously formed in a band shape in a substantially perpendicular direction (ie, a film width direction) from one margin 11, and a band shape continuously formed in a substantially perpendicular direction (ie, a film length direction) from the second margin 12; A third margin 13 at the other end of the film having a predetermined length (the lower side in the drawing) and a fourth margin 14 continuously formed in a belt shape in a direction substantially perpendicular to the third margin 13 (ie, in the film width direction). Become.

The width and length of each of the first to fourth margins 11 to 14 depend on the width of the film, the desired capacitance of the capacitor, the characteristics of the applied voltage and the like so as not to cause a discharge phenomenon. An appropriate width and length are selected depending on the case. For example, when the maximum voltage to be applied is 5 kV, the width of the film is about 5 mm or more and about 50 mm or less. While preventing the phenomenon,
The width of each of the first to fourth margins 11 to 14 is preferably about 0.5 mm or more and about 10 mm or less, and more preferably about 1 mm, from the viewpoint that the size and capacity of the capacitor can be reduced.
It is more preferably at least about 5 mm. As the width of each of the first to fourth margins 11 to 14 is reduced, the size and capacity of the capacitor can be reduced.

The length of the margin is not particularly limited, but, for example, is preferably 3 mm or more and 100 mm or less, more preferably 5 mm or more and 50 mm or less. The width and length of each of the first to fourth margins 11 to 14 may be different between each of the margins 11 to 14, but from the viewpoint of facilitating the production of the metallized film for capacitors, It is preferable that the widths and lengths of 11 to 14 are the same. A first metal electrode layer 20 is laminated on the film surface other than the first surface margin 10 including the first to fourth margins 11 to 14.

On the surface of the single-sided metallized second film that overlaps with the single-sided metalized first film, second surface margins 31 are provided at both ends so as to overlap the first margin 11 and the third margin 13, The second metal electrode layers 30 are respectively laminated on portions of the film surface other than the second surface margin 31. As will be described in detail later, the first metal electrode layer 20 of the single-sided metallized first film includes one end-side metal electrode layer 21 extending from one end edge of the film (upper side in the drawing) to the other end side (lower side in the drawing); Other edge (bottom of drawing)
Metal electrode layer 2 extending from one end to the other end (upper side in the drawing)
2 and the second metal electrode layer 30 is a single-sided metallized second
It is laminated on the surface of the film,
One end metal electrode layer 21 and the other end metal electrode layer 2 of the film
It overlaps with 2.

As surrounded by a dotted line in FIG. 1, a first metal electrode layer 20 is laminated on a single-sided metallized first film, and a second metal electrode layer 30 is laminated on a single-sided metallized second film. A single unit X of the capacitor is formed by overlapping and winding. In the metal film capacitor according to the present invention, the fourth margin 14 in such a unit X of the capacitor and the first margin 11 in the unit X ′ of the capacitor adjacent to the unit of the capacitor are formed by the single-sided metalized first film. It is continuous on the surface. In each capacitor unit X, one capacitor element 25 is provided between one end side metal electrode layer 21 and the second metal electrode layer 30, and one capacitor element 25 is provided between the other end side metal electrode layer 21 and the second metal electrode layer 30. One capacitor element 25 is formed.

In the above description, attention is paid to the first surface margin 10 provided on the surface of the single-sided metallized first film. However, if attention is paid to the metal electrode layer 20 laminated on the film surface other than the first surface margin 10, As shown in FIG. 1, on the surface of the metallized film for a capacitor according to the present invention, a plurality of metal pieces extending from one end side (upper side in the drawing) to the other end side (lower side in the drawing) are provided. Electrode layer 2
1 and a plurality of other-end metal electrode layers 22 extending from the other end of the film (lower side in the drawing) toward one end (upper side in the drawing) and insulated from the one-end metal electrode layer 21. The first metal electrode layer 20 has one other end metal electrode layer 22 sandwiched between two adjacent one end metal electrode layers 21, and one first metal electrode layer 22 between two adjacent other end metal electrode layers 22. One end side metal electrode layer 21 is provided in a state sandwiched therebetween, and one end side metal electrode layer 21 and the other end side metal electrode layer 22 are provided.
The second metal electrode layer 30 is provided on the surface of the single-sided metalized second film so as to overlap with the second metal electrode layer 30. Similarly to the above, one capacitor element 25 is connected between the one end metal electrode layer 21 and the second metal electrode layer 30 by the other end metal electrode layer 22 and the second metal electrode layer 22.
One capacitor element 25 is formed between the capacitor element 25 and the metal electrode layer 30.

Although the width of the film is at most about 5 mm to 50 mm, the length of the film is usually about several meters to several tens of meters and is very long, so there is room for providing a margin in the film length direction. In the metallized film for a capacitor according to the present invention, by dividing the electrode made of metal by the first surface margin 10 having a sufficient width, the possibility of the occurrence of a discharge phenomenon is extremely reduced, and the first surface margin 10 is reduced. The occupation ratio can be reduced. Therefore,
According to the present invention, the capacitance of the capacitor can be increased, and the size of the capacitor can be reduced. The present invention is more effective as the film has a smaller width, and the width of the film used in the present invention is preferably 50 mm or less, more preferably 15 mm or less.

Further, like the conventional metallized film for a capacitor, the metallized film for a capacitor according to the present invention can also be cut in accordance with the desired characteristics of the capacitor such as capacitance. After being cut, wound, as shown in FIG. 7, a metal such as zinc or a zinc-tin alloy is sprayed on both ends of the wound metallized film for a capacitor to form an external electrode 91, A lead wire 92 made of an iron wire, a copper-coated steel wire, or the like is pulled out from the external electrode 91.
Finally, this is dipped in the resin or inserted into the case 93 to enclose the resin in the case, whereby the resin is cured to obtain the wound type film capacitor according to the present invention. Such a wound film capacitor is also included in the gist of the present invention.

FIG. 1C shows an equivalent circuit of a metallized film for a capacitor according to the present invention. As shown in FIG. Since they are connected in parallel, a discharge phenomenon occurs and one capacitor element 25
Is destroyed, the destroyed capacitor element 25 is merely isolated on the circuit, and the other capacitor elements 2
5 is not adversely affected.

In FIG. 1, one end side metal electrode layer 21 and the other end side metal electrode layer 22 are formed at both ends of the surface of the single-sided metallized first film. From the viewpoint of increasing the facing area where the two metal electrode layers 30 overlap, as shown in FIG. 2, the first margin 11 and the third margin 13 are formed at one end (upper side in the drawing) and the other end (lower side in the drawing), respectively. Side). That is, focusing on the first metal electrode layer 20, one end side metal electrode layer 21 extends from one end edge of the film toward the other end side, and the other end side metal electrode layer 22 extends from the other end edge of the film toward one end side. It is preferably extended. By forming the first metal electrode layer 20 in this manner, the facing area can be increased as much as possible.

In FIGS. 1 and 2, the second metal electrode layer 30 is provided continuously in the film length direction. However, the second margin 12 or the fourth margin on the surface of the single-sided metalized first film is provided. No capacitor element is formed in a portion where the second metal electrode layer 14 and the second metal electrode layer 30 overlap.
Therefore, as shown in FIG. 3, by providing a width direction margin 32 on the surface of the single-sided metallized second film that overlaps with either the second margin 12 or the fourth margin 14 on the surface of the single-sided metalized first film, It is preferable to reduce the possibility that a discharge phenomenon occurs. In FIG. 3, the width direction margin 32 is provided so as to overlap the second margin 12.

Also in the metallized film for a capacitor according to the present invention, the width of the metal electrode layer is increased at one end (upper side in the drawing) or at the other end ( (Lower side of the drawing). Paying attention to the margin, specifically, as shown in FIG. 4, the first surface margin 10 extends from the intersection of the first margin 11 and the second margin 12 in the film length direction. 15 and a second security margin 16 extending in the film length direction from the intersection of the third margin 13 and the fourth margin 14.

With respect to the conventional metallized film for a capacitor with a security mechanism as described in paragraph 0007,
Although there is a problem that the design efficiency is reduced, the metallized film for a capacitor according to the present invention has first and third margins 11 and 13 in the film length direction. Only in the length direction of the film. Therefore, the design efficiency can be improved as compared with a conventional metallized film for a capacitor with a security mechanism.

Next, a method for producing the metallized film for a capacitor according to the present invention as described above will be briefly described. The metallized film for a capacitor according to the present invention is produced by using a conventional method for producing a metallized film for a capacitor. Specifically, the film is fed from a film feed roller around which the film is wound to about 100 m / min.
0 m / min or less, preferably about 200 m / min or more and about 800
m / min or less, more preferably about 250 m / min or more and about 40
Oil is first sprayed onto a portion where a margin is to be formed and the film is unmasked at a speed of 0 m / min or less and wound on a film winding roller, and then the film is vacuumed (pressure: about 1 × 10 ^{At -4} Pa), a metal such as aluminum is vapor-deposited on the film,
Oil margin method for removing oil, or tape margin method in which metal is directed toward the film in a vacuum while running a tape corresponding to the part where the margin is to be created simultaneously with the film, and a part corresponding to the part where the margin is to be created A coating method, in which a metal such as aluminum is vapor-deposited on a film in a vacuum, and then the coating on the film is removed. Among these, it is preferable to use the coating method from the viewpoint that a complicated margin shape can be formed easily and precisely as compared with the oil margin method and the tape margin method. As a means for removing the paint on the film in the paint method, there is a means for using a water-based paint and washing the film with water after vapor deposition of the metal.

In the oil margin method, the amount of the masking oil to be injected depends on the type of the masking oil layer, the type of the film, and the like.
The thickness is set to be about 80 nm to about 80 nm. The masking oil layer may be formed by depositing a masking oil on a film.

Regardless of the oil margin method, the tape margin method, and the coating method, examples of the film used in the present invention include polyolefin films such as polyethylene films and polypropylene films, and polyester films such as polyethylene terephthalate and polyethylene naphthalate. For example, when a polyester film such as polyethylene terephthalate is used, it is preferable to use paraffin oil as the masking oil. Similarly, when a polyolefin film such as a polyethylene film is used, it is preferable to use paraffin oil or perchloroalkyl ether as the masking oil. Such a masking oil is removed from the film by evaporating due to the heat of the metal when a metal such as aluminum is deposited.

In the coating method, the amount of the coating applied to the film is adjusted so that the film has a thickness of about 0.5 μm to about 2 μm on the surface of the film, similarly to the masking oil. As the paint used in the paint method, various paints can be selected depending on a method of removing the paint after vapor deposition of the metal, a solvent used for the removal, etc., from the viewpoint of safety, ease of handling, cost, etc. Water-soluble paints are preferred. This is because the water-soluble paint can be easily removed by washing with water. Such water-soluble paints generally contain water-soluble polymers, pigments, dispersants, and other additives. Water-soluble polymers include methylcellulose, carboxycellulose, polyvinyl alcohol,
Examples include polyvinylpyrrolidone, starch, and vinyl acetate. Examples of the pigment include barium sulfate, calcium carbonate, and titanium oxide. Among these, polyvinyl alcohol is used as the water-soluble polymer, and barium sulfate is used as the pigment because it is not only inexpensive but also easy to separate and recover from the waste liquid after removal with water and easy to handle. Is preferred.

(Embodiment 2) As shown in FIG.
In another metallized film for a capacitor according to the present invention, the capacitor elements 25 are provided in odd-numbered stages (three stages). More specifically, as shown in FIG.
On the surface of the single-sided metalized first film, a first metal electrode layer 41 extending from one end edge (upper side in the drawing) to the other end side (lower side in the drawing) and a first metal electrode layer 41 insulated from the first metal electrode layer 41. A second metal electrode layer 42 is provided adjacent to the first metal electrode layer 4 on the one-sided metallized second film surface.
The first metal electrode layer 51 provided so as to overlap the first and second metal electrode layers 42 and the first metal electrode layer 51 which overlaps with the second metal electrode layer 42 but is insulated from the first metal electrode layer 51 and has the other edge of the film (see FIG. The second extending from one side (upper side in the drawing) from one side (lower side)
The metal electrode layer 52 is provided adjacently. As shown in FIG. 5, two first surface margins 491 parallel to the film length direction are provided around the substantially rectangular second metal electrode layer 42.
And a surface margin 49 continuous with the first surface margin 491 and composed of two second surface margins 492 perpendicular to the film length direction, whereby the second metal electrode layer 42 is isolated in an island shape. And is insulated from the first metal electrode layer 41. Similarly to the second metal electrode layer 42, the first metal electrode layer 51 is also isolated in an island shape by a surface margin 59 including a first surface margin 591 and a second surface margin 592 provided therearound. Second metal electrode layer 52
Insulated from

In the metallized film for a capacitor according to the present invention, the first metal electrode layer 41, the second metal electrode layer 42, the first metal electrode layer 51, and the second metal electrode layer 52 described above with reference to FIG. A unit X of a capacitor as shown in a portion surrounded by a dotted line is formed. As shown in FIG. 5, the unit X of the capacitor is configured such that the second metal electrode layer 42 It is formed continuously in the film length direction so as to overlap with one metal electrode layer 51 '. Such a metallized film for a capacitor according to the present invention is different from the metallized film for a capacitor in the first embodiment in that the capacitor elements are arranged in three stages as shown in FIG. So you can
The size and capacity of the capacitor can be further reduced. The equivalent circuit will be briefly described. In FIG. 5A and FIG. 5B, a portion Y surrounded by a dashed line is shown.
Correspond to the portion Y in the equivalent circuit shown in FIG.

Further, as shown in FIG. 5C, in such a metallized film for a capacitor, since the capacitor element 25 is connected in parallel, a discharge phenomenon occurs and one capacitor element Even if 25 is destroyed,
The broken capacitor element 25 is merely isolated on the circuit, and does not adversely affect other capacitor elements 25.

(Embodiment 3) As shown in FIG.
In still another metallized film for capacitors according to the present invention, the capacitor elements 25 are provided in even-numbered stages (four stages). More specifically, as shown in FIG. 6, a first metal electrode extending from one edge of the film (upper side in the drawing) to the other side (lower side in the drawing) is formed on the surface of the single-sided metalized first film. A layer 71, a second metal electrode layer 72 insulated from the first metal electrode layer 71, and a third metal insulated from the first and second metal electrode layers and extending from the other end to the one end of the film. The electrode layer 73, the first, second, and third
Fourth metal electrode layer 7 insulated from metal electrode layers 71 to 73
4 are provided so as to be adjacent to each other in the film length direction. On the other hand, on the surface of the single-sided metalized second film, a first metal electrode layer 81 provided to overlap the first metal electrode layer 71 and the second metal electrode layer 72 and a second metal electrode layer 7 are provided.
The second metal electrode layer 82 provided so as to overlap the second, third and fourth metal electrode layers 73 and 74 is provided so as to be adjacent to the film length direction. The metallized film for a capacitor according to the present invention includes the first metal electrode layer 71, the second metal electrode layer 72, and the third metal electrode layer 7.
3. Fourth metal electrode layer 74 (the one-sided metallized first film), first metal electrode layer 81, and second metal electrode layer 82
(One-sided metallized second film) and one unit X of the capacitor is placed in the film length direction such that the fourth metal electrode layer 74 overlaps the first metal electrode layer 81 ′ of the adjacent capacitor one unit X ′. It is formed continuously.

FIG. 6C shows an equivalent circuit of the metallized film for a capacitor according to the present invention as compared with the metallized film for a capacitor according to the first embodiment.
As shown in (1), since the number of capacitor elements can be four, the size and capacity of the capacitor can be further reduced. Further, as shown in FIG. 6C, even in such a metallized film for a capacitor, since the capacitor element 25 is connected in parallel, the destruction of the capacitor element 25 due to a discharge phenomenon is also described in the first embodiment. 2 and other capacitor elements 2
5 is not adversely affected.

The method for manufacturing a metallized film for a capacitor described in the second and third embodiments is almost the same as the method for manufacturing a metallized film for a capacitor described in the first embodiment.

A wound film capacitor obtained by superposing and winding such a single-sided metallized first film and a single-sided metallized second film is also included in the gist of the present invention.

In the present invention, as shown in FIG. 1, a heat-adhesive resin layer 8 is laminated on the back surface of the single-sided metallized first film and the back surface of the single-sided metallized second film. Thereafter, the single-sided metallized first film and the single-sided metallized second film may be adhered by heat pressing. By adhering the single-sided metalized first film and the single-sided metalized second film in this manner, it is possible to prevent void discharge or the like that deteriorates the metal electrode layer of the film due to air existing between the films. it can. In addition, polyester can be used as such a heat-adhesive resin layer 6.

[0038]

According to the present invention, a metallized film for a capacitor capable of increasing the capacitance of the capacitor and reducing the size of the capacitor by making the shape of the margin a special shape, and a metallized film for the capacitor. And a wound film capacitor using the same.

[Brief description of the drawings]

FIG. 1 (a) is a plan view of a single-sided metallized first film used in the present invention (surface). FIG. 1 (b) is a plan view of a single-sided metallized second film used in the present invention (surface). (D) Cross-sectional view and equivalent circuit diagram of superimposed films

FIG. 2A is a plan view of a single-sided metallized first film used in the present invention (surface). FIG. 2B is a plan view of a single-sided metallized second film used in the present invention.

3A is a plan view of a single-sided metallized first film used in the present invention (surface); FIG. 3B is a plan view of a single-sided metallized second film used in the present invention (surface); (D) Cross-sectional view and equivalent circuit diagram of superimposed films

FIG. 4A is a plan view of a single-sided metalized first film with a security mechanism (front side). FIG.

FIG. 5 (a) Another single-sided metallization used in the present invention.
(B) Plan view (surface) of another single-sided metallized second film used in the present invention (c) Equivalent circuit diagram

FIG. 6 (a) is a plan view of another single-sided metallized first film used in the present invention (surface); and FIG. 6 (b) is a plan view of another single-sided metallized second film used in the present invention (surface). (C) Equivalent circuit diagram

FIG. 7 is a sectional view of a wound film capacitor according to the present invention.

8A is a plan view of a conventional metallized film for a capacitor (front surface), FIG. 8B is a bottom view thereof, and FIG.

9A is a plan view of a conventional metallized film for a capacitor (front surface), FIG. 9B is a bottom view thereof, and FIG.

FIG. 10 is an exploded view of a conventional metallized film for a capacitor in which a metal electrode layer is divided by a margin 103 in a film length direction.

11A is a plan view showing a conventional metal film capacitor with a security mechanism (front surface), FIG. 11B is a bottom view thereof, and FIG.

[Explanation of symbols]

 10: First surface margin 11: First margin 12: Second margin 13: Third margin 14: Fourth margin 15: First security margin 16: Second security margin 20: First metal electrode layer 21: One end Side metal electrode layer 22: Other end side metal electrode layer 25: Capacitor element 30: Second metal electrode layer 31: Second surface margin 32: Width margin 41: First metal electrode layer 42: Second metal electrode layer 49: Surface margin 491: First surface margin 492: Second surface margin 51: First metal electrode layer 52: Second metal electrode layer 59: Surface margin 591: First surface margin 592: Second surface margin 6: Thermal adhesive resin Layer 71: first metal electrode layer 72: second metal electrode layer 73: third metal electrode layer 74: fourth metal electrode layer 81: first metal electrode layer 82: second metal electrode layer 91: outside Part electrode 92: Lead wire 93: Case X: One capacitor unit

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Miyuki Nagaoka 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. F-term (reference) 5E082 AA07 AB04 BB05 EE07 EE23 FF05 FG36

Claims (12)

[Claims] 1. A first margin (1) on one end side of a film having a predetermined length and provided in a strip shape in a film length direction.
1) a second margin (1) formed continuously from the first margin (11) in a strip shape in a direction substantially perpendicular to the film width direction;
2) a third margin (13) on the other end side of the film having a predetermined length, which is formed continuously in a strip shape in a film length direction substantially perpendicular to the second margin (12), and the third margin ( A metal provided on the film surface other than the first surface margin (10), in which a fourth margin (14) continuously formed in a strip shape in the film width direction substantially perpendicular to the direction from 13) is repeatedly formed in the film length direction. A first metal electrode layer (20) made of a single-sided metallized first film and a strip-shaped metal film in the longitudinal direction of the film, at least part of which is the first margin (11) and the third margin (13). And a second metal electrode layer (30) made of metal provided on the film surface other than the second surface margin (31) having a predetermined width so as to overlap with the second surface marginal (31). The superposition and film capacitor formed by winding. 2. The film capacitor according to claim 1, wherein the first margin and the third margin are in contact with one end and the other end of the film, respectively. 3. The method according to claim 2, wherein the second surface margin (31) is the second margin (12) or the fourth margin (14).
3. The film capacitor according to claim 1, further comprising a width direction margin having a predetermined width so as to overlap with any one of the above. 4. The first surface margin (10) comprises a first margin (11) and a second margin (12).
A first security margin (15) extending in the film length direction from the intersection of the first and second margins (13) extending in the film length direction from the intersection of the third margin (13) and the fourth margin (14). 2 further having a security margin (16);
The film capacitor according to claim 1. 5. A plurality of one end metal electrode layers (21) extending from one end of the film toward the other end, and a plurality of one end metal electrode layers extending from the other end of the film toward one end. A plurality of other metal electrode layers (2
2), the first metal electrode layer (20)
One other end metal electrode layer (22) is sandwiched between two one end side metal electrode layers (21), and one one end side metal electrode layer is placed between two adjacent other end side metal electrode layers (22). (21) a single-sided metallized first film continuously formed on the film surface so as to be sandwiched between the first-side metal electrode layer (21) and the other-end metal electrode layer (22); A film capacitor in which a metal electrode layer (30) is superposed and wound on a single-sided metallized second film provided on the film surface. 6. The one end metal electrode layer (21) extends from one edge of the film toward the other end, and the other end metal electrode layer (22) extends from the other end of the film toward one end. The film capacitor according to claim 5, which is provided. 7. The second metal electrode layer (30) overlaps one end metal electrode layer (21) and one of the adjacent other metal electrode layers (22), but is adjacent to the other end of the other metal electrode layer (22). The film capacitor according to claim 5, wherein the film capacitor is divided in the film length direction so as not to overlap the side metal electrode layer. 8. The one-side metal electrode layer (21) has a width reduced in the vicinity of one end, and the other-side metal electrode layer (2) is narrowed.
The width of (2) is reduced in the vicinity of the other end edge.
The film capacitor according to any one of the above. 9. A first metal electrode layer (41) extending from one edge of the film toward the other end, and a second metal electrode layer (42) insulated from the first metal electrode layer (41). A single-sided metallized first film repeatedly provided adjacent to the film surface in the film length direction; the first metal electrode layer (41) and the second metal electrode layer (4).
2) and a first metal electrode layer (5
1) and a second metal electrode layer overlapping with the second metal electrode layer (42) but insulated from the first metal electrode layer (51) adjacent thereto and extending from the other end edge of the film toward one end edge. (52) A film capacitor obtained by superposing and winding a single-sided metallized second film repeatedly provided on the film surface. 10. A first metal electrode layer (71) extending from one edge of the film toward the other end, and a second metal electrode layer (72) insulated from the first metal electrode layer (71). A third metal electrode layer (73) insulated from the first and second metal electrode layers (71, 72) and extending from the other end of the film toward one end; and the first, second, and third metal electrode layers. A single-sided metallized first film in which a fourth metal electrode layer (74) insulated from the third metal electrode layer (71, 72, 73) is repeatedly formed on the film surface adjacent to the film length direction; The first metal electrode layer (8) provided so as to overlap the first metal electrode layer (71) and the second metal electrode layer (72).
1) overlaps the second metal electrode layer (72), the third metal electrode layer (73), and the fourth metal electrode layer (74),
A single-sided metallized second film repeatedly formed on the film surface adjacent to a second metal electrode layer (82) provided insulated from the first metal electrode layer (81) in the film length direction; A film capacitor made by superposing and winding. 11. A heat-adhesive resin layer (6) is formed on the back surface of said one-sided metallized first film and on the back surface of said one-sided metallized second film, wherein said one-sided metallized first film and said one-sided metallized The two films are in close contact with each other.
11. The film capacitor according to any one of items 1 to 10. 12. The film capacitor according to claim 11, wherein said heat-adhesive resin layer (6) is made of polyester.