Film capacitor

Abstract

This film capacitor comprises: a dielectric film; a first electrode disposed on a first surface; and a second electrode disposed on a second surface. The film capacitor includes three unit capacitors connected in series in a short side direction S. The first electrode is separated into a first non-segmented electrode and a first segmented electrode. The first segmented electrode is divided into a plurality of first small electrode groups. Each of the plurality of first small electrode groups includes a plurality of first small electrodes connected by a first fuse. The second electrode is separated into a second non-segmented electrode and a second segmented electrode. The second segmented electrode is divided into a plurality of second small electrode groups. Each of the plurality of second small electrode groups includes a plurality of second small electrodes connected by a second fuse.

Description

Technical Field

[0001] The present disclosure generally relates to film capacitors, and more particularly to film capacitors used in electronic devices, electrical devices, industrial devices, automobiles, and the like.

Background Art

[0002] Patent Document 1 discloses a film capacitor. This film capacitor employs a structure in which two capacitors are connected in series.

[0003] Specifically, the film capacitor of Patent Document 1 is a film capacitor having a structure in which two films are stacked and wound cylindrically.

[0004] On one side of one of the two films, two common electrodes that are divided into two in the film width direction orthogonal to the winding direction and are continuous in the winding direction are vapor-deposited.

[0005] Also, on the other side of the one film or on one side of the other film, partial electrodes that are divided into two in the film width direction and are divided into a plurality in the winding direction are vapor-deposited.

[0006] Among the above-divided partial electrodes, two partial electrodes in a plurality of sets arranged in the film width direction are connected to each other through a safety mechanism located between the two partial electrodes for each set.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] The film capacitor described in Patent Document 1 achieves high voltage resistance by employing a structure in which two capacitors are connected in series.

[0009] However, there was a problem in that using it at even higher voltages made it difficult to maintain the overall function of the film capacitor.

[0010] The purpose of this disclosure is to provide a film capacitor that can maintain its overall function even when used at high voltage. [Means for solving the problem]

[0011] A film capacitor according to one aspect of the present disclosure comprises a dielectric film having a first surface and a second surface opposite to the first surface, extending in a longitudinal direction perpendicular to the short direction, a first electrode disposed on the first surface, and a second electrode disposed on the second surface.

[0012] The film capacitor includes three unit capacitors connected in series in the short direction, with the first electrode and the second electrode facing each other via the dielectric film.

[0013] The first electrode is divided by the first margin portion extending in the longitudinal direction into a first non-divided electrode extending in the longitudinal direction and a first divided electrode. Divide It is being done.

[0014] The first divided electrode is divided into a plurality of first small electrode groups arranged in the longitudinal direction by a first short-direction slit portion extending in the short-direction direction.

[0015] Each of the aforementioned plurality of first small electrode groups includes a plurality of first small electrodes connected by a first fuse.

[0016] The second electrode is divided by the second margin portion extending in the longitudinal direction into a second non-divided electrode extending in the longitudinal direction and a second divided electrode. Divide It is being done.

[0017] The second divided electrode is divided into a plurality of second small electrode groups arranged in the longitudinal direction by a second short-side direction slit portion extending in the short-side direction.

[0018] Each of the plurality of second small electrode groups includes a plurality of second small electrodes connected by second fuses.

Advantages of the Invention

[0019] According to the present disclosure, even when used at a high voltage, the overall function can be maintained.

Brief Description of the Drawings

[0020] [Figure 1] FIG. 1 is an explanatory diagram showing a film capacitor according to the first embodiment. [Figure 2] FIG. 2A is an explanatory diagram showing a state in which the first electrode and the second electrode of the film capacitor according to the first embodiment face each other. FIG. 2B is an explanatory diagram showing a state in which the first electrode and the second electrode of the film capacitor according to the second embodiment face each other. [Figure 3] FIG. 3 is an explanatory diagram showing a film capacitor according to the third embodiment. [Figure 4] FIG. 4 is an explanatory diagram showing a state in which the first electrode and the second electrode of the film capacitor of the same type face each other. [Figure 5] FIG. 5 is a schematic cross-sectional view showing a film capacitor according to the fourth embodiment. [Figure 6] FIG. 6 is an explanatory diagram showing the film capacitor of the same type. [Figure 7] FIG. 7A is a schematic cross-sectional view showing a film capacitor including one unit capacitor in the short-side direction. FIG. 7B is an explanatory diagram showing the film capacitor of the same type. [Figure 8] FIG. 8A is a schematic cross-sectional view showing a film capacitor including two unit capacitors connected in series in the short-side direction. FIG. 8B is an explanatory diagram showing the film capacitor of the same type. [Figure 9]Figure 9A is a schematic cross-sectional view showing a film capacitor containing three unit capacitors connected in series in the short direction. Figure 9B is an explanatory diagram showing the same film capacitor. [Figure 10] Figure 10 is a schematic perspective view showing an example of a film capacitor. [Modes for carrying out the invention]

[0021] 1. Overview Figure 10 shows an example of a film capacitor 1. The film capacitor 1 is, for example, cylindrical in shape. The film capacitor 1 is formed, for example, by overlapping and winding two elongated dielectric films 2 (a first dielectric film 21 and a second dielectric film 22).

[0022] Here, a first electrode 31 is arranged on one side of the first dielectric film 21. A second electrode 32 is arranged on one side of the second dielectric film 22. In the film capacitor 1, the first electrode 31 and the second electrode 32 face each other via the dielectric film 2. End electrodes 30 (first end electrode 310 and second end electrode 320) are formed at both ends of the film capacitor 1. The first electrode 31 is connected to the first end electrode 310. The second electrode 32 is connected to the second end electrode 320. The film capacitor 1 can be charged by applying a voltage between the first end electrode 310 and the second end electrode 320.

[0023] The film capacitor 1 may contain 1 to 3 unit capacitors 10 in the short-side direction S (width direction) of the dielectric film 2 (see Figures 7A, 8A, and 9A). This point will be explained below. Note that one side of the short-side direction S may be referred to as the "left side" and the other side as the "right side".

[0024] The film capacitor 1 shown in Figure 7A includes one unit capacitor 10 in the short-side direction S of the dielectric film 2.

[0025] As shown in Figure 7B, a first end margin 241 is located at the right end of one side of the first dielectric film 21. The first electrode 31 is located on the entire side of the first dielectric film 21, excluding the first end margin 241. The first electrode 31 includes the left end of one side of the first dielectric film 21 and is connected to the first end electrode 310 at this point (see Figure 7A). Due to the presence of the first end margin 241, the first electrode 31 and the second end electrode 320 are spaced apart.

[0026] On the other hand, a second end margin portion 242 is located at the left end of one side of the second dielectric film 22. The second electrode 32 is located on the entire one side of the second dielectric film 22, excluding the second end margin portion 242. The second electrode 32 includes the right end of one side of the second dielectric film 22 and is connected to the second end electrode 320 at this point (see Figure 7A). Due to the presence of the second end margin portion 242, the second electrode 32 and the first end electrode 310 are spaced apart.

[0027] Then, as shown in Figure 7A, a single unit capacitor 10 is formed in the portion where the first electrode 31 and the second electrode 32 face each other via the dielectric film 2 (first dielectric film 21).

[0028] Furthermore, the film capacitor 1 shown in Figure 8A includes two unit capacitors 10 connected in series in the short-side direction S of the dielectric film 2.

[0029] As shown in Figure 8B, the first electrode 31 is divided into left and right sides by the first margin portion 211. The left side of the first electrode 31 includes the left edge of one side of the first dielectric film 21 and is connected to the first end electrode 310 at this portion. The right side of the first electrode 31 includes the right edge of one side of the first dielectric film 21 and is connected to the second end electrode 320 at this portion (see Figure 8A).

[0030] On the other hand, second end margins 242 are provided at the left and right ends of one side of the second dielectric film 22. The second electrode 32 is positioned across the entire area between the second end margins 242 on both sides. The presence of the second end margins 242 on both sides causes the second electrode 32 to be spaced apart from the first end electrode 310 and the second end electrode 320.

[0031] As shown in Figure 8A, two unit capacitors 10 are formed in the portion where the first electrode 31 and the second electrode 32 face each other via the dielectric film 2 (first dielectric film 21). These unit capacitors 10 are connected in series in the short-side direction S.

[0032] Therefore, when the voltage applied to the film capacitor 1 shown in Figure 7A and Figure 8A is the same, the film capacitor 1 shown in Figure 8A has a lower voltage applied to the unit capacitor 10, which makes it easier to suppress damage to the dielectric film 2.

[0033] Furthermore, the film capacitor 1 shown in Figure 9A includes three unit capacitors 10 connected in series in the short-side direction S of the dielectric film 2.

[0034] As shown in Figure 9B, the first electrode 31 is divided into left and right sides by the first margin portion 211. The left side of the first electrode 31 includes the left edge of one side of the first dielectric film 21 and is connected to the first end electrode 310 at this portion (see Figure 9A). The first end margin portion 241 is located at the right edge of one side of the first dielectric film 21. The right side of the first electrode 31 is located throughout the space between the first margin portion 211 and the first end margin portion 241. The presence of the first end margin portion 241 causes the right side of the first electrode 31 and the second end electrode 320 to be separated.

[0035] On the other hand, the second electrode 32 is divided into left and right sides by the second margin portion 212. The right side of the second electrode 32 includes the right edge of one side of the second dielectric film 22 and is connected to the second end electrode 320 at this portion (see Figure 9A). A second end margin portion 242 is located at the left edge of one side of the second dielectric film 22. The left side of the second electrode 32 is located throughout the space between the second end margin portion 242 and the second margin portion 212. Due to the presence of the second end margin portion 242, the left side of the second electrode 32 and the first end electrode 310 are spaced apart.

[0036] As shown in Figure 9A, three unit capacitors 10 are formed in the portion where the first electrode 31 and the second electrode 32 face each other via the dielectric film 2 (first dielectric film 21). These unit capacitors 10 are connected in series in the short-side direction S.

[0037] Therefore, when the voltage applied to the film capacitors 1 shown in Figures 7A, 8A, and 9A is the same, the voltage applied to the unit capacitor 10 of the film capacitor 1 shown in Figure 9A will be the smallest, which further helps to suppress damage to the dielectric film 2.

[0038] The inventors have further improved the film capacitor 1 shown in Figures 9A and 9B and developed the following film capacitor 1.

[0039] In other words, as shown in Figure 1, the first electrode 31 is divided by the first margin portion 211 into a first non-divided electrode 41 and a first divided electrode 51. Divide The first divided electrode 51 is divided into a plurality of first small electrode groups 510 by the first short-direction slit portion 221. Each of the plurality of first small electrode groups 510 includes a plurality of first small electrodes 511. The plurality of first small electrodes 511 are connected by the first fuse 61.

[0040] On the other hand, the second electrode 32 is divided by the second margin portion 212 into a second non-divided electrode 42 and a second divided electrode 52. DivideThe second divided electrode 52 is divided into a plurality of second small electrode groups 520 by a second short-direction slit portion 222. Each of the plurality of second small electrode groups 520 includes a plurality of second small electrodes 521. The plurality of second small electrodes 521 are connected by a second fuse 62.

[0041] The first unit capacitor 10 is formed in the area where the first non-divided electrode 41 and the left second small electrode 521 face each other via the dielectric film 2 (area Z1 in Figure 1). The second unit capacitor 10 is formed in the area where the left first small electrode 511 and the right second small electrode 521 face each other via the dielectric film 2 (area Z2 in Figure 1). The third unit capacitor 10 is formed in the area where the right first small electrode 511 and the second non-divided electrode 42 face each other via the dielectric film 2 (area Z3 in Figure 1). These three unit capacitors 10 are connected in series in the short-side direction S.

[0042] Furthermore, since multiple first small electrodes 511 are connected by a first fuse 61 and multiple second small electrodes 521 are connected by a second fuse 62, even if a short circuit occurs between a portion of the first electrode 31 and the second electrode 32, at least one of the first fuse 61 and the second fuse 62 will be blown.

[0043] Therefore, according to this embodiment, the overall function can be maintained even when used at high voltage. However, the film capacitor 1 in this embodiment may be of the wound type or the laminated type.

[0044] 2.Details (1) First Embodiment The film capacitor 1 according to the first embodiment will be described below with reference to the drawings.

[0045] As shown in Figure 1, the film capacitor 1 comprises a dielectric film 2, a first electrode 31, and a second electrode 32.

[0046] The film capacitor 1 includes three unit capacitors 10 connected in series in the short direction S, with the first electrode 31 and the second electrode 32 facing each other via a dielectric film 2 (first dielectric film 21 in this embodiment) (see Figure 9A).

[0047] The dielectric film 2, the first electrode 31, and the second electrode 32 will be described below.

[0048] <Dielectric film> The dielectric film 2 is a film composed of a dielectric material. The dielectric material is not particularly limited, but examples include polypropylene (PP) and polyethylene terephthalate (PET).

[0049] The dielectric film 2 is in the form of an elongated film. That is, the dielectric film 2 is a film that extends in the longitudinal direction L, which is perpendicular to the short direction S.

[0050] The dielectric film 2 has a first surface 201 and a second surface 202 (see Figure 9A). The first surface 201 is the surface facing one side in the thickness direction T of the dielectric film 2. The thickness direction T is perpendicular to the short side S and the long side L. The second surface 202 is the surface opposite to the first surface 201. That is, the second surface 202 is the surface facing the other side in the thickness direction T of the dielectric film 2.

[0051] In this embodiment, the dielectric film 2 includes a first dielectric film 21 and a second dielectric film 22.

[0052] <1st electrode> The first electrode 31 may be a vapor-deposited electrode, a metal foil electrode, or a plated electrode. The material of the first electrode 31 is not particularly limited, but examples include aluminum.

[0053] The first electrode 31 is positioned on the first surface 201 of the dielectric film 2 (first dielectric film 21 in this embodiment).

[0054] The first electrode 31 is divided by the first margin portion 211 into a first non-divided electrode 41 and a first divided electrode 51. Divide It is being done.

[0055] The first margin portion 211 is the portion on the first surface 201 of the first dielectric film 21 where the first electrode 31 is not located. Therefore, the dielectric film 2 is exposed in this portion. The first margin portion 211 extends in the longitudinal direction L with a constant width.

[0056] The first non-divided electrode 41 is a solid electrode extending in the longitudinal direction L. That is, the first non-divided electrode 41 is positioned over the entire area between the first margin portion 211 and one end (left side) in the short direction S of the first dielectric film 21. The left end of the first non-divided electrode 41 can be connected to the first end face electrode 310 (not shown in Figure 1).

[0057] On the other hand, the first divided electrode 51 is positioned between the first margin portion 211 and the first end margin portion 241.

[0058] Here, the first end margin portion 241 is located at the other end (right side) of the short-side direction S of the first dielectric film 21. Like the first margin portion 211, the first end margin portion 241 is also a portion where the first electrode 31 is not located. Therefore, the dielectric film 2 is also exposed in this portion. The first end margin portion 241 extends in the longitudinal direction L with a constant width. The presence of the first end margin portion 241 allows the first divided electrode 51 and the second end face electrode 320 (not shown in Figure 1) to be separated. In this embodiment, the width of the first end margin portion 241 is the same as the width of the first margin portion 211, but it may differ to the extent that it does not impair the effects of this embodiment.

[0059] Furthermore, the first divided electrode 51 is divided into a plurality of first small electrode groups 510 by at least one first short-direction slit portion 221.

[0060] The first short-side slit portion 221 is a portion of the first surface 201 of the first dielectric film 21 where the first electrode 31 is not located. Therefore, the dielectric film 2 is exposed in this portion as well, similar to the first margin portion 211 and the first end margin portion 241. The first short-side slit portion 221 extends in the short-side direction S with a constant width. The first short-side slit portion 221 is connected to the first margin portion 211 and the first end margin portion 241. In this embodiment, the width of the first short-side slit portion 221 is the same as the width of the first margin portion 211, but it may differ within a range that does not impair the effects of this embodiment.

[0061] Multiple groups of first small electrodes 510 are arranged in the longitudinal direction L. Each of the multiple groups of first small electrodes 510 includes multiple (two in this embodiment) first small electrodes 511.

[0062] Multiple first small electrodes 511 are arranged in the short direction S. In this embodiment, the shape of the first small electrodes 511 is rectangular, but is not particularly limited. Also, in this embodiment, the multiple first small electrodes 511 are the same size, but they may be different as long as it does not impair the effects of this embodiment.

[0063] Multiple first small electrodes 511 contained in each of the multiple first small electrode groups 510 are connected by a first fuse 61. The first fuse 61 is the part that melts when an excessive current flows and interrupts the circuit. The first fuse 61 connects adjacent first small electrodes 511 in the short direction S. The width of the first fuse 61 is shorter than the length L in the long direction of the first small electrodes 511.

[0064] <Second electrode> The second electrode 32, like the first electrode 31, may be a vapor-deposited electrode, a metal foil electrode, or a plated electrode. The material of the second electrode 32 is the same as the material of the first electrode 31.

[0065] The second electrode 32 is located on the second surface 202 of the dielectric film 2 (the first dielectric film 21 in this embodiment). In other words, in this embodiment, the second electrode 32 is located on the first surface 201 of the second dielectric film 22.

[0066] The second electrode 32 is divided by the second margin portion 212 into a second non-divided electrode 42 and a second divided electrode 52. Divide It is being done.

[0067] The second margin portion 212 is the portion on the first surface 201 of the second dielectric film 22 where the second electrode 32 is not located. Therefore, the dielectric film 2 is exposed in this portion. The second margin portion 212 extends in the longitudinal direction L with a constant width. In this embodiment, the width of the second margin portion 212 is the same as the width of the first margin portion 211, but it may differ within a range that does not impair the effects of this embodiment.

[0068] The second non-divided electrode 42 is a solid electrode extending in the longitudinal direction L. That is, the second non-divided electrode 42 is positioned across the entire area between the second margin portion 212 and the other end (right side) in the short direction S of the second dielectric film 22. The right end of the second non-divided electrode 42 can be connected to the second end face electrode 320.

[0069] On the other hand, the second divided electrode 52 is positioned between the second margin portion 212 and the second end margin portion 242.

[0070] Here, the second end margin portion 242 is located at one end (left side) in the short direction S of the second dielectric film 22. The second end margin portion 242, like the second margin portion 212, is a portion where the second electrode 32 is not located. Therefore, the dielectric film 2 is also exposed in this portion. The second end margin portion 242 extends in the longitudinal direction L with a constant width. The presence of the second end margin portion 242 allows the second divided electrode 52 and the first end face electrode 310 to be separated. In this embodiment, the width of the second end margin portion 242 is the same as the width of the second margin portion 212, but it may differ within a range that does not impair the effects of this embodiment.

[0071] Furthermore, the second divided electrode 52 is divided into a plurality of second small electrode groups 520 by at least one second short-direction slit portion 222.

[0072] The second short-side slit portion 222 is a portion of the first surface 201 of the second dielectric film 22 where the second electrode 32 is not located. Therefore, the dielectric film 2 is exposed in this portion as well as in the second margin portion 212 and the second end margin portion 242. The second short-side slit portion 222 extends in the short-side direction S with a constant width. The second short-side slit portion 222 is connected to the second margin portion 212 and the second end margin portion 242. In this embodiment, the width of the second short-side slit portion 222 is the same as the width of the second margin portion 212, but it may differ within a range that does not impair the effects of this embodiment. Furthermore, in this embodiment, the width of the second short-side slit portion 222 is the same as the width of the first short-side slit portion 221, but it may differ within a range that does not impair the effects of this embodiment.

[0073] Multiple second small electrode groups 520 are arranged in the longitudinal direction L. Each of the multiple second small electrode groups 520 includes multiple (two in this embodiment) second small electrodes 521.

[0074] Multiple second small electrodes 521 are arranged in the short-side direction S. In this embodiment, the shape of the second small electrodes 521 is rectangular, but is not particularly limited. Also, in this embodiment, the multiple second small electrodes 521 are the same size, but may differ to the extent that it does not impair the effects of this embodiment. Furthermore, in this embodiment, the shape and size of the second small electrodes 521 are the same as the shape and size of the first small electrode 511, but may differ to the extent that it does not impair the effects of this embodiment.

[0075] Multiple second small electrodes 521 contained in each of the multiple second small electrode groups 520 are connected by a second fuse 62. Like the first fuse 61, the second fuse 62 is a component that melts when an excessive current flows, interrupting the circuit. The second fuse 62 connects adjacent second small electrodes 521 in the short direction S. The width of the second fuse 62 is shorter than the length L in the long direction of the second small electrodes 521.

[0076] The second electrode 32 described above faces the first electrode 31 via a dielectric film 2 (in this embodiment, the first dielectric film 21).

[0077] Specifically, the second divided electrode 52 of the second electrode 32 faces the first undivided electrode 41 of the first electrode 31 via the dielectric film 2 (part Z1 in Figure 1). More precisely, the second small electrode 521 on the left side of the second electrode 32 faces the first undivided electrode 41 of the first electrode 31 via the dielectric film 2. The first unit capacitor 10 is formed in this area.

[0078] Furthermore, the second divided electrode 52 of the second electrode 32 faces the first divided electrode 51 of the first electrode 31 via the dielectric film 2 (part Z2 in Figure 1). More specifically, the second small electrode 521 on the right side of the second electrode 32 faces the first small electrode 511 on the left side of the first electrode 31 via the dielectric film 2. A second unit capacitor 10 is formed in this area.

[0079] Furthermore, the second undivided electrode 42 of the second electrode 32 faces the first divided electrode 51 of the first electrode 31 via the dielectric film 2 (part Z3 in Figure 1). More specifically, the second undivided electrode 42 of the second electrode 32 faces the first small electrode 511 on the right side of the first electrode 31 via the dielectric film 2. A third unit capacitor 10 is formed in this area.

[0080] <Effects and Effects> According to this embodiment, the overall function can be maintained even when the film capacitor 1 is used at a high voltage.

[0081] In other words, the film capacitor 1 according to this embodiment includes three unit capacitors 10 connected in series in the short-side direction S of the dielectric film 2, similar to the film capacitor 1 shown in Figure 9A. Therefore, if the voltage applied between the first end electrode 310 and the second end electrode 320 of the film capacitor 1 shown in Figures 7A and 8A is the same as the voltage applied between the first end electrode 310 and the second end electrode 320 of the film capacitor 1 according to this embodiment, the voltage applied to the unit capacitor 10 of the film capacitor 1 according to this embodiment will be smaller than the voltage applied to the unit capacitor 10 of the film capacitor 1 shown in Figures 7A and 8A, thereby further suppressing damage to the dielectric film 2.

[0082] Furthermore, in the film capacitor 1 according to this embodiment, as shown in Figure 1, the multiple first small electrodes 511 are connected by a first fuse 61, and the multiple second small electrodes 521 are connected by a second fuse 62. Therefore, even if a short circuit occurs between a portion of the first electrode 31 and the second electrode 32, at least one of the first fuse 61 and the second fuse 62 will be blown.

[0083] Therefore, according to this embodiment, the overall function can be maintained even when the film capacitor 1 is used at a high voltage.

[0084] (2) Second Embodiment Next, the film capacitor 1 according to the second embodiment will be described with reference to the drawings. In the second embodiment, components similar to those in the first embodiment may be given the same reference numerals as in the first embodiment, and detailed descriptions may be omitted.

[0085] The film capacitor 1 according to the second embodiment shown in Figure 2B, similar to the film capacitor 1 according to the first embodiment shown in Figure 2A, has a portion (Z1 portion) where the first non-divided electrode 41 and the second divided electrode 52 face each other via the dielectric film 2, a portion (Z2 portion) where the first divided electrode 51 and the second divided electrode 52 face each other, and a portion (Z3 portion) where the first divided electrode 51 and the second non-divided electrode 42 face each other.

[0086] ≪First short-direction slit section≫ The film capacitor 1 according to this embodiment differs from the film capacitor 1 according to the first embodiment in that the width of the first short-direction slit portion 221 varies depending on the location. This point will be explained below.

[0087] As shown in Figure 2A, in the film capacitor 1 according to the first embodiment, the width of the first short-direction slit portion 221 in the portion where the first divided electrode 51 and the second divided electrode 52 face each other (portion Z2) is the same as the width of the first short-direction slit portion 221 in the portion where the first divided electrode 51 and the second non-divided electrode 42 face each other (portion Z3).

[0088] Incidentally, the unit capacitor 10 is formed in the portion where the first electrode 31 and the second electrode 32 face each other, but not in the portion where the first electrode 31 and the second electrode 32 do not face each other. For example, the unit capacitor 10 is not formed in the portion where the first electrode 31 and the second short-direction slit portion 222 face each other (see portion Xa enclosed by the dashed line). Similarly, the unit capacitor 10 is not formed in the portion where the first short-direction slit portion 221 and the second electrode 32 face each other (see portion Xa).

[0089] Therefore, in particular, in the portion where the first divided electrode 51 and the second divided electrode 52 face each other (portion Z2), it is more ideal when the first short-direction slit portion 221 and the second short-direction slit portion 222 face each other compared to when they do not. More specifically, the larger the area where the first short-direction slit portion 221 and the second short-direction slit portion 222 face each other, the more ideal it is. This is because if the first short-direction slit portion 221 and the second short-direction slit portion 222 do not face each other, the capacitance of the unit capacitor 10 in portion Z2 decreases by an amount equivalent to their width. Conversely, in portion Z2, the larger the area where the first short-direction slit portion 221 and the second short-direction slit portion 222 face each other, the larger the electrode area of ​​the unit capacitor 10 (the area where the first electrode 31 and the second electrode 32 face each other) becomes, thus suppressing the decrease in the capacitance of the unit capacitor 10.

[0090] The problems described above hardly occur in the portion where the first non-divided electrode 41 and the second divided electrode 52 face each other (Z1 portion), and in the portion where the first divided electrode 51 and the second non-divided electrode 42 face each other (Z3 portion). This is because, in portion Z1, the first non-divided electrode 41 is a solid electrode, so regardless of the position of the second short-direction slit portion 222 facing the first non-divided electrode 41 in the longitudinal direction L, the capacitance of the unit capacitor 10 in portion Z1 does not change significantly. The same applies to portion Z3.

[0091] On the other hand, in the portion (Z2 portion) where the first divided electrode 51 and the second divided electrode 52 face each other, it is ideal for the first short-side direction slit portion 221 and the second short-side direction slit portion 222 to face each other. However, in reality, there may be cases where the first short-side direction slit portion 221 and the second short-side direction slit portion 222 do not face each other. One of the reasons is that, as shown in FIG. 10, two dielectric films 2 (the first dielectric film 21 and the second dielectric film 22) are overlapped and wound. In this case, since the first electrode 31 and the second electrode 32 are separated from each other by the thickness of the dielectric film 2 in the thickness direction T, when the two dielectric films 2 are overlapped and wound, the first electrode 31 and the second electrode 32 are gradually displaced along the winding direction (longitudinal direction L). As a result, the first short-side direction slit portion 221 and the second short-side direction slit portion 222 may not face each other. Then, at most, the capacitance of the unit capacitor 10 in the Z2 portion decreases by an amount corresponding to the sum of the widths of the first short-side direction slit portion 221 and the second short-side direction slit portion 222 (Xa portion), and may differ from the capacitance of the unit capacitor 10 in the Z1 and Z3 portions. Therefore, when a voltage is applied between the first end face electrode 310 and the second end face electrode 320 of the film capacitor 1, the voltage applied to the three unit capacitors 10 connected in series in the short-side direction S may become non-uniform.

[0092] Therefore, in the film capacitor 1 according to the second embodiment shown in FIG. 2B, the width Wa1 of the first short-side direction slit portion 221 in the portion (Z2 portion) where the first divided electrode 51 and the second divided electrode 52 face each other is made smaller than the width Wb1 of the first short-side direction slit portion 221 in the portion (Z3 portion) where the first divided electrode 51 and the second non-divided electrode 42 face each other (Wa1 < Wb1). As a result, the area of the first electrode 31 in the Z2 portion relatively increases, so that even when the first short-side direction slit portion 221 and the second short-side direction slit portion 222 do not face each other, a decrease in the capacitance of the unit capacitor 10 in the Z2 portion can be suppressed.

[0093] ≪Second short-side direction slit portion≫ Furthermore, the film capacitor 1 according to the present embodiment is different from the film capacitor 1 according to the first embodiment in that the width of the second short-side direction slit portion 222 varies depending on the location. Hereinafter, this point will be described. Regarding the second short-side direction slit portion 222 as well, the same concept as the above-described first short-side direction slit portion 221 applies.

[0094] That is, in the film capacitor 1 according to the second embodiment shown in FIG. 2B, the width Wa2 of the second short-side direction slit portion 222 in the portion (Z2 portion) where the first divided electrode 51 and the second divided electrode 52 face each other is made smaller than the width Wb2 of the second short-side direction slit portion 222 in the portion (Z1 portion) where the first non-divided electrode 41 and the second divided electrode 52 face each other (Wa2 < Wb2). As a result, since the area of the second electrode 32 in the Z2 portion relatively increases, even when the first short-side direction slit portion 221 and the second short-side direction slit portion 222 do not face each other, a further decrease in the capacitance of the unit capacitor 10 in the Z2 portion can be suppressed.

[0095] ≪First short-side direction slit portion and second short-side direction slit portion≫ In the present embodiment, the relationship between the first short-side direction slit portion 221 in the Z2 and Z3 portions and the second short-side direction slit portion 222 in the Z1 and Z2 portions is also defined.

[0096] That is, as shown in FIG. 2B, the sum of the width Wa1 of the first short-side direction slit portion 221 and the width Wa2 of the second short-side direction slit portion 222 in the portion (Z2 portion) where the first divided electrode 51 and the second divided electrode 52 face each other is equal to at least either the width Wb1 of the first short-side direction slit portion 221 in the portion (Z3 portion) where the first divided electrode 51 and the second non-divided electrode 42 face each other, or the width Wb2 of the second short-side direction slit portion 222 in the portion (Z1 portion) where the first non-divided electrode 41 and the second divided electrode 52 face each other.

[0097] The relationship between the first short-direction slit portion 221 in the Z2 and Z3 portions and the second short-direction slit portion 222 in the Z1 and Z2 portions can be expressed mathematically as one of the following (1) to (3).

[0098] (1) Wa1 + Wa2 = Wb1 (2) Wa1 + Wa2 = Wb2 (3) Wa1 + Wa2 = Wb1 = Wb 2

[0099] In this embodiment, the width Wb1 of the first short-direction slit portion 221 in portion Z3 is equal to the width Wb2 of the second short-direction slit portion 222 in portion Z1. Therefore, in this embodiment, the formula in (3) above is particularly applicable. Note that, as long as the effects of this embodiment are not impaired, the sum of Wa1 and Wa2 does not have to be exactly equal to Wb1, nor does it have to be exactly equal to Wb2.

[0100] If the above formula (1) holds true, the voltage applied to the unit capacitor 10 in at least the Z2 and Z3 portions will be less likely to be uneven. The decrease in capacitance of the unit capacitor 10 in the Z2 portion is maximum when the first short-direction slit portion 221 and the second short-direction slit portion 222 do not face each other at all (see portion Xb enclosed by the dashed line). In this case, the capacitance of the unit capacitor 10 in the Z2 portion decreases by an amount equivalent to the sum of the widths of the first short-direction slit portion 221 and the second short-direction slit portion 222 (Wa1 + Wa2). However, the sum of the widths of the first short-direction slit portion 221 and the second short-direction slit portion 222 in the Z2 portion (Wa1 + Wa2) is equal to the width of the first short-direction slit portion 221 in the Z3 portion (Wb1). The portion equivalent to this width (Wb1) is where the unit capacitor 10 is not originally formed in the Z3 portion. Therefore, the voltage applied to the unit capacitor 10 in at least the Z2 and Z3 portions is less likely to be non-uniform.

[0101] Based on the same concept as above, when the formula in (2) above holds, the voltage applied to the unit capacitor 10 in at least the Z1 and Z2 portions is less likely to become non-uniform. Further, when the formula in (3) above holds, the voltage applied to the unit capacitor 10 in the Z1 to Z3 portions is less likely to become non-uniform.

[0102] <Operational Effect> According to this embodiment, in addition to the same operational effects as those of the first embodiment, the following operational effects are also achieved.

[0103] That is, in this embodiment, the width Wa1 of the first short-side direction slit portion 221 in the Z2 portion is smaller than the width Wb1 of the first short-side direction slit portion 221 in the Z3 portion (Wa1 < Wb1), and the width Wa2 of the second short-side direction slit portion 222 in the Z2 portion is smaller than the width Wb2 of the second short-side direction slit portion 222 in the Z1 portion (Wa2 < Wb2).

[0104] Therefore, even if the first short-side direction slit portion 221 and the second short-side direction slit portion 222 in the Z2 portion are displaced in the longitudinal direction L without facing each other in the thickness direction T, the electrode area of the unit capacitor 10 in the Z2 portion does not deviate significantly from the electrode areas of the unit capacitors 10 in the Z1 and Z3 portions.

[0105] Therefore, according to this embodiment, when a voltage is applied between the first end surface electrode 310 and the second end surface electrode 320 of the film capacitor 1, the voltage applied to the three unit capacitors 10 connected in series in the short-side direction S is less likely to become non-uniform. In other words, it is possible to suppress the voltage applied to a specific unit capacitor from becoming extremely large.

[0106] (3) Third Embodiment Next, the film capacitor 1 according to the third embodiment will be described with reference to the drawings. In the third embodiment, the same components as those in the first and second embodiments may be denoted by the same reference numerals as in the first and second embodiments, and detailed descriptions thereof may be omitted.

[0107] The film capacitor 1 according to the third embodiment shown in Figures 3 and 4, similar to the film capacitor 1 according to the first embodiment, has a portion (Z1 portion) where the first non-divided electrode 41 and the second divided electrode 52 face each other via the dielectric film 2, a portion (Z2 portion) where the first divided electrode 51 and the second divided electrode 52 face each other, and a portion (Z3 portion) where the first divided electrode 51 and the second non-divided electrode 42 face each other.

[0108] ≪First short-direction slit section≫ The film capacitor 1 according to this embodiment differs from the film capacitor 1 according to the first embodiment in that the number of first short-direction slit portions 221 varies depending on the location. In this embodiment, the problem described in the second embodiment is solved by changing the number of first short-direction slit portions 221 depending on the location. This point will be explained below.

[0109] Specifically, in this embodiment, the number of first short-direction slits 221 in the portion where the first divided electrode 51 and the second divided electrode 52 face each other (portion Z2) is less than the number of first short-direction slits 221 in the portion where the first divided electrode 51 and the second undivided electrode 42 face each other (portion Z3).

[0110] In other words, in the first embodiment, all first short-direction slit portions 221 are connected to the first margin portion 211 and the first end margin portion 241 (see Figure 1), whereas in this embodiment, at least one or more first short-direction slit portions 221 are connected to the first end margin portion 241 and not to the first margin portion 211 (see the Y1 portion enclosed by the dashed line in Figure 4).

[0111] In this embodiment, the shapes and sizes of the multiple first small electrodes 511 included in the first small electrode group 510 are different. Although not particularly limited, as shown in Figure 3, the first small electrode 511a has a rectangular shape that is longer in the longitudinal direction L compared to the first small electrode 511b.

[0112] The first small electrode 511a is located in the Z2 region. The first small electrode 511b is located in the Z3 region. The first small electrode 511a is connected to each of the multiple first small electrodes 511b by the first fuse 61.

[0113] As described above, the number of first short-direction slits 221 in the Z2 portion is made smaller than the number of first short-direction slits 221 in the Z3 portion, thereby relatively increasing the area of ​​the first electrode 31 in the Z2 portion. This makes it possible to suppress a decrease in the capacitance of the unit capacitor 10 in the Z2 portion, even if the first short-direction slits 221 and the second short-direction slits 222 do not face each other in the Z2 portion.

[0114] ≪Second short-direction slit section≫ Furthermore, the film capacitor 1 according to this embodiment differs from the film capacitor 1 according to the first embodiment in that the number of second short-direction slit portions 222 varies depending on their location. This point will be explained below, but the same concept as described above applies to the second short-direction slit portions 222 as to the first short-direction slit portion 221.

[0115] Specifically, in this embodiment, the number of second short-direction slits 222 in the portion where the first divided electrode 51 and the second divided electrode 52 face each other (portion Z2) is less than the number of second short-direction slits 222 in the portion where the first non-divided electrode 41 and the second divided electrode 52 face each other (portion Z1).

[0116] In other words, in the first embodiment, all second short-direction slit portions 222 are connected to the second margin portion 212 and the second end margin portion 242 (see Figure 1), whereas in this embodiment, at least one or more second short-direction slit portions 222 are connected to the second end margin portion 242 and not to the second margin portion 212 (see the Y2 portion enclosed by the dashed line in Figure 4).

[0117] In this embodiment, the shapes and sizes of the multiple second small electrodes 521 included in the second small electrode group 520 are different. Although not particularly limited, as shown in Figure 3, the second small electrode 521a has a rectangular shape that is longer in the longitudinal direction L compared to the second small electrode 521b.

[0118] The second small electrode 521a is located in the Z2 region. The second small electrode 521b is located in the Z1 region. The second small electrode 521a is connected to each of the multiple second small electrodes 521b by the second fuse 62.

[0119] As described above, the number of second short-direction slits 222 in the Z2 portion is made smaller than the number of second short-direction slits 222 in the Z1 portion, thereby relatively increasing the area of ​​the second electrode 32 in the Z2 portion. This makes it possible to suppress a decrease in the capacitance of the unit capacitor 10 in the Z2 portion, even if the first short-direction slit 221 and the second short-direction slit 222 do not face each other in the Z2 portion.

[0120] <Effects and Effects> According to this embodiment, in addition to the same effects and advantages as in the first embodiment, the following effects and advantages are also achieved.

[0121] In other words, in this embodiment, the number of first short-direction slits 221 in portion Z2 is less than the number of first short-direction slits 221 in portion Z3, and the number of second short-direction slits 222 in portion Z2 is less than the number of second short-direction slits 222 in portion Z1.

[0122] Therefore, even if the first short-direction slit portion 221 and the second short-direction slit portion 222 in the Z2 portion do not face each other in the thickness direction T but are offset in the longitudinal direction L, the electrode area of ​​the unit capacitor 10 in the Z2 portion will not deviate significantly from the electrode area of ​​the unit capacitor 10 in the Z1 and Z3 portions.

[0123] Therefore, according to this embodiment, when a voltage is applied between the first end face electrode 310 and the second end face electrode 320 of the film capacitor 1, the voltage applied to the three unit capacitors 10 connected in series in the short direction S is less likely to become uneven. In other words, it is possible to suppress the voltage applied to a particular unit capacitor from becoming extremely large.

[0124] (4) Fourth Embodiment Next, the film capacitor 1 according to the fourth embodiment will be described with reference to the drawings. In the fourth embodiment, components similar to those in the first to third embodiments may be denoted by the same reference numerals as in the first to third embodiments, and detailed descriptions may be omitted.

[0125] The film capacitor 1 according to this embodiment is similar to the film capacitor 1 according to the first to third embodiments in that it includes three unit capacitors 10 connected in series in the short direction S, but it differs from the film capacitor 1 according to the first to third embodiments in that it may include four or more unit capacitors 10 connected in series in the short direction S.

[0126] In other words, the film capacitor 1 according to this embodiment is an extension or generalization of the number of unit capacitors 10 connected in series in the short direction S to three or more. Hereinafter, the number of unit capacitors 10 connected in series in the short direction S will be n (where n≧3).

[0127] Figures 5 and 6 show an example of a film capacitor 1 when n=4. This film capacitor 1 has a dielectric film 2 through which the first non-divided electrode 41 and the second divided electrode 52 face each other (parts Z1 and Z4), and a dielectric film 2 through which the first divided electrode 51 and the second divided electrode 52 face each other (parts Z2 and Z3).

[0128] <Dielectric film> The dielectric film 2 in this embodiment is the same as the dielectric film 2 in the first to third embodiments.

[0129] <1st electrode> [When n is an odd number greater than or equal to 3] The first electrode 31 is divided by at least one first margin portion 211 into at least one first non-divided electrode 41 and at least one first divided electrode 51. Divide In particular, the first electrode 31 is divided into (n+1) / 2 parts. Divide For example, in the case of n=3, the first electrode 31 is divided into two. Divide (See Figure 1). For example, the first electrode 31 is divided by one first margin portion 211 into one first non-divided electrode 41 and one first divided electrode 51. Divide It will be done.

[0130] Furthermore, the first electrode 31 is connected to the first end face electrode 310, but not to the second end face electrode 320. To give a specific example, when n=3, the first non-divided electrode 41, located on one side (left side) of the short direction S of the dielectric film 2, is connected to the first end face electrode 310, but the first divided electrode 51, located on the other side (right side) of the short direction S of the dielectric film 2, is not connected to the second end face electrode 320.

[0131] [When n is an even number greater than or equal to 4] The first electrode 31 is divided by at least one first margin portion 211 into at least one first non-divided electrode 41 and at least one first divided electrode 51. Divide In particular, the first electrode 31 is divided into (n+2) / 2 parts. Divide For example, if n=4, the first electrode 31 is divided into three parts. Divide (See Figures 5 and 6). For example, the first electrode 31 is divided by two first margin portions 211 into two first non-divided electrodes 41 and one first divided electrode 51. Divide It will be done.

[0132] Furthermore, the first electrode 31 is connected to the first end electrode 310 and the second end electrode 320. To give a specific example, when n=4, the first non-divided electrode 41 located on one side (left side) of the short direction S of the dielectric film 2 is connected to the first end electrode 310, and the first non-divided electrode 41 located on the other side (right side) of the short direction S of the dielectric film 2 is connected to the second end electrode 320.

[0133] [When n is an integer greater than or equal to 3] The first non-divided electrode 41 is preferably connected to the end face electrode 30.

[0134] <Second electrode> [When n is an odd number greater than or equal to 3] The second electrode 32 is divided by at least one second margin portion 212, including at least one second divided electrode 52. Divide In particular, the second electrode 32 is divided into (n+1) / 2 parts. Divide For example, when n=3, the second electrode 32 is divided into two. Divide (See Figure 1). For example, the second electrode 32 is divided by a second margin portion 212 into one second divided electrode 52 and one second undivided electrode 42. Divide Thus, if the second electrode 32 includes only one second divided electrode 52, the second electrode 32 further includes at least one second undivided electrode 42.

[0135] Furthermore, the second electrode 32 is not connected to the first end face electrode 310, but it is connected to the second end face electrode 320. To give a specific example, when n=3, the second divided electrode 52, which is located on one side (left side) of the short direction S of the dielectric film 2, is not connected to the first end face electrode 310, but the second undivided electrode 42, which is located on the other side (right side) of the short direction S of the dielectric film 2, is connected to the second end face electrode 320.

[0136] [When n is an even number greater than or equal to 4] The second electrode 32 is divided by at least one second margin portion 212, including at least one second divided electrode 52. DivideIn particular, the second electrode 32 is divided into n / 2 units. Divide For example, when n=4, the second electrode 32 is divided into two. Divide (See Figures 5 and 6). For example, the second electrode 32 is divided into two second divided electrodes 52 by one second margin portion 212. Divide Thus, when the second electrode 32 includes two or more second divided electrodes 52, each second small electrode group 520 is arranged in the short-side direction S (see Figure 6). On the other hand, when the second electrode 32 includes only one second divided electrode 52, the second electrode 32 further includes at least one second undivided electrode 42.

[0137] Furthermore, the second electrode 32 is not connected to the first end electrode 310 and the second end electrode 320. To give a specific example, when n=4, the second divided electrode 52 located on one side (left side) of the short direction S of the dielectric film 2 is not connected to the first end electrode 310, and the second divided electrode 52 located on the other side (right side) of the short direction S of the dielectric film 2 is also not connected to the second end electrode 320.

[0138] [When n is an integer greater than or equal to 3] If the second electrode 32 includes a second non-divided electrode 42, it is preferable that the second non-divided electrode 42 is connected to the end face electrode 30.

[0139] <Effects and Effects> According to this embodiment, the overall function can be maintained even when the film capacitor 1 is used at a high voltage.

[0140] In other words, the film capacitor 1 according to this embodiment includes three or more unit capacitors 10 connected in series in the short-side direction S of the dielectric film 2 (see Figures 5 and 9A). Therefore, if the voltage applied between the first end electrode 310 and the second end electrode 320 of the film capacitor 1 shown in Figures 7A and 8A is the same as the voltage applied between the first end electrode 310 and the second end electrode 320 of the film capacitor 1 according to this embodiment, the voltage applied to the unit capacitor 10 of the film capacitor 1 according to this embodiment will be smaller than the voltage applied to the unit capacitor 10 of the film capacitor 1 shown in Figures 7A and 8A, thereby further suppressing damage to the dielectric film 2.

[0141] Furthermore, in the film capacitor 1 according to this embodiment, the multiple first small electrodes 511 are connected by a first fuse 61, and the multiple second small electrodes 521 are connected by a second fuse 62 (see Figures 1 and 6). Therefore, even if a short circuit occurs between a portion of the first electrode 31 and the second electrode 32, at least one of the first fuse 61 and the second fuse 62 will be blown.

[0142] Therefore, according to this embodiment, the overall function can be maintained even when the film capacitor 1 is used at a high voltage. [Explanation of symbols]

[0143] 1 Film Capacitor 10 Unit Capacitors 2 Dielectric film 201 Page 1 202 2nd page 211 First Margin Section 212 Second Margin Section 221 First short-direction slit section 222 Second short-direction slit section 31 1st electrode 32 2nd electrode 41 1st undivided electrode 42 2nd undivided electrode 51 1st divided electrode 510 1st small electrode group 511 1st small electrode 52 Second split electrode 520 2nd small electrode group 521 2nd small electrode 61 First Fuse 62. Second Fuse S (Short direction) L Longitudinal direction Wa1 width Wb1 width Wa2 width Wb2 width

Claims

1. A dielectric film having a first surface and a second surface opposite to the first surface, extending in a longitudinal direction perpendicular to the short direction, A first electrode arranged on the first surface, The device comprises a second electrode arranged on the second surface, The first electrode and the second electrode face each other via the dielectric film, thereby including three unit capacitors connected in series in the short direction. The first electrode is divided by the first margin portion extending in the longitudinal direction into a first non-divided electrode extending in the longitudinal direction and a first divided electrode. The first divided electrode is divided into a plurality of first small electrode groups arranged in the longitudinal direction by the first short-direction slit portion extending in the short-direction direction, Each of the plurality of first small electrode groups includes a plurality of first small electrodes connected by a first fuse, The second electrode is divided by the second margin portion extending in the longitudinal direction into a second non-divided electrode extending in the longitudinal direction and a second divided electrode. The second divided electrode is divided into a plurality of second small electrode groups arranged in the longitudinal direction by the second short-direction slit portion extending in the short-direction direction, Each of the aforementioned plurality of second small electrode groups includes a plurality of second small electrodes connected by a second fuse, A portion exists between the first non-divided electrode and the second divided electrode, a portion between the first divided electrode and the second divided electrode, and a portion between the first divided electrode and the second non-divided electrode, through the dielectric film. The width of the first short-direction slit portion in the portion where the first divided electrode and the second divided electrode face each other is smaller than the width of the first short-direction slit portion in the portion where the first divided electrode and the second non-divided electrode face each other. Film capacitor.

2. The width of the second short-direction slit portion in the portion where the first divided electrode and the second divided electrode face each other is smaller than the width of the second short-direction slit portion in the portion where the first non-divided electrode and the second divided electrode face each other. The film capacitor according to claim 1.

3. A dielectric film having a first surface and a second surface opposite to the first surface, and extending in a longitudinal direction perpendicular to the short direction, A first electrode arranged on the first surface, The device comprises a second electrode arranged on the second surface, The first electrode and the second electrode face each other via the dielectric film, thereby including three unit capacitors connected in series in the short direction. The first electrode is divided by the first margin portion extending in the longitudinal direction into a first non-divided electrode extending in the longitudinal direction and a first divided electrode. The first divided electrode is divided into a plurality of first small electrode groups arranged in the longitudinal direction by the first short-direction slit portion extending in the short-direction direction, Each of the plurality of first small electrode groups includes a plurality of first small electrodes connected by a first fuse, The second electrode is divided by the second margin portion extending in the longitudinal direction into a second non-divided electrode extending in the longitudinal direction and a second divided electrode. The second divided electrode is divided into a plurality of second small electrode groups arranged in the longitudinal direction by the second short-direction slit portion extending in the short-direction direction, Each of the aforementioned plurality of second small electrode groups includes a plurality of second small electrodes connected by a second fuse, A portion exists between the first non-divided electrode and the second divided electrode, a portion between the first divided electrode and the second divided electrode, and a portion between the first divided electrode and the second non-divided electrode, through the dielectric film. The sum of the width of the first short-direction slit portion and the width of the second short-direction slit portion in the portion where the first divided electrode and the second divided electrode face each other is equal to at least one of the width of the first short-direction slit portion in the portion where the first divided electrode and the second non-divided electrode face each other, and the width of the second short-direction slit portion in the portion where the first non-divided electrode and the second divided electrode face each other. Film capacitor.

4. A dielectric film having a first surface and a second surface opposite to the first surface, and extending in a longitudinal direction perpendicular to the short direction, A first electrode arranged on the first surface, The device comprises a second electrode arranged on the second surface, The first electrode and the second electrode face each other via the dielectric film, thereby including three unit capacitors connected in series in the short direction. The first electrode is divided by the first margin portion extending in the longitudinal direction into a first non-divided electrode extending in the longitudinal direction and a first divided electrode. The first divided electrode is divided into a plurality of first small electrode groups arranged in the longitudinal direction by the first short-direction slit portion extending in the short-direction direction, Each of the plurality of first small electrode groups includes a plurality of first small electrodes connected by a first fuse, The second electrode is divided by the second margin portion extending in the longitudinal direction into a second non-divided electrode extending in the longitudinal direction and a second divided electrode. The second divided electrode is divided into a plurality of second small electrode groups arranged in the longitudinal direction by the second short-direction slit portion extending in the short-direction direction, Each of the aforementioned plurality of second small electrode groups includes a plurality of second small electrodes connected by a second fuse, A portion exists between the first non-divided electrode and the second divided electrode, a portion between the first divided electrode and the second divided electrode, and a portion between the first divided electrode and the second non-divided electrode, through the dielectric film. The number of first short-direction slits in the portion where the first divided electrode and the second divided electrode face each other is less than the number of first short-direction slits in the portion where the first divided electrode and the second non-divided electrode face each other. Film capacitor.

5. The number of second short-direction slits in the portion where the first divided electrode and the second divided electrode face each other is less than the number of second short-direction slits in the portion where the first non-divided electrode and the second divided electrode face each other. The film capacitor according to claim 4.

6. A dielectric film having a first surface and a second surface opposite to the first surface, and extending in a longitudinal direction perpendicular to the short direction, A first electrode arranged on the first surface, The device comprises a second electrode arranged on the second surface, The first electrode and the second electrode face each other via the dielectric film, thereby including three or more odd-numbered unit capacitors connected in series in the short-side direction. The first electrode is divided by at least one first margin portion extending in the longitudinal direction into at least one first non-divided electrode extending in the longitudinal direction and at least one first divided electrode, The first divided electrode is divided into a plurality of first small electrode groups arranged in the longitudinal direction by the first short-direction slit portion extending in the short-direction direction, Each of the plurality of first small electrode groups includes a plurality of first small electrodes connected by a first fuse, The second electrode is divided by at least one second margin portion extending in the longitudinal direction, including at least one second non-divided electrode extending in the longitudinal direction and at least one second divided electrode. The second divided electrode is divided into a plurality of second small electrode groups arranged in the longitudinal direction by the second short-direction slit portion extending in the short-direction direction, Each of the aforementioned plurality of second small electrode groups includes a plurality of second small electrodes connected by a second fuse, A portion exists between the first non-divided electrode and the second divided electrode, a portion between the first divided electrode and the second divided electrode, and a portion between the first divided electrode and the second non-divided electrode, through the dielectric film. The width of the first short-direction slit portion in the portion where the first divided electrode and the second divided electrode face each other is smaller than the width of the first short-direction slit portion in the portion where the first divided electrode and the second non-divided electrode face each other. Film capacitor.

7. A dielectric film having a first surface and a second surface opposite to the first surface, extending in a longitudinal direction perpendicular to the short direction, A first electrode arranged on the first surface, The device comprises a second electrode arranged on the second surface, The first electrode and the second electrode face each other via the dielectric film, thereby including three or more odd-numbered unit capacitors connected in series in the short-side direction. The first electrode is divided by at least one first margin portion extending in the longitudinal direction into at least one first non-divided electrode extending in the longitudinal direction and at least one first divided electrode, The first divided electrode is divided into a plurality of first small electrode groups arranged in the longitudinal direction by the first short-direction slit portion extending in the short-direction direction, Each of the plurality of first small electrode groups includes a plurality of first small electrodes connected by a first fuse, The second electrode is divided by at least one second margin portion extending in the longitudinal direction, including at least one second non-divided electrode extending in the longitudinal direction and at least one second divided electrode. The second divided electrode is divided into a plurality of second small electrode groups arranged in the longitudinal direction by the second short-direction slit portion extending in the short-direction direction, Each of the aforementioned plurality of second small electrode groups includes a plurality of second small electrodes connected by a second fuse, A portion exists between the first non-divided electrode and the second divided electrode, a portion between the first divided electrode and the second divided electrode, and a portion between the first divided electrode and the second non-divided electrode, through the dielectric film. The sum of the width of the first short-direction slit portion and the width of the second short-direction slit portion in the portion where the first divided electrode and the second divided electrode face each other is equal to at least one of the width of the first short-direction slit portion in the portion where the first divided electrode and the second non-divided electrode face each other, and the width of the second short-direction slit portion in the portion where the first non-divided electrode and the second divided electrode face each other. Film capacitor.

8. A dielectric film having a first surface and a second surface opposite to the first surface, and extending in a longitudinal direction perpendicular to the short direction, A first electrode arranged on the first surface, The device comprises a second electrode arranged on the second surface, The first electrode and the second electrode face each other via the dielectric film, thereby including three or more odd-numbered unit capacitors connected in series in the short-side direction. The first electrode is divided by at least one first margin portion extending in the longitudinal direction into at least one first non-divided electrode extending in the longitudinal direction and at least one first divided electrode, The first divided electrode is divided into a plurality of first small electrode groups arranged in the longitudinal direction by the first short-direction slit portion extending in the short-direction direction, Each of the plurality of first small electrode groups includes a plurality of first small electrodes connected by a first fuse, The second electrode is divided by at least one second margin portion extending in the longitudinal direction, including at least one second non-divided electrode extending in the longitudinal direction and at least one second divided electrode. The second divided electrode is divided into a plurality of second small electrode groups arranged in the longitudinal direction by the second short-direction slit portion extending in the short-direction direction, Each of the aforementioned plurality of second small electrode groups includes a plurality of second small electrodes connected by a second fuse, A portion exists between the first non-divided electrode and the second divided electrode, a portion between the first divided electrode and the second divided electrode, and a portion between the first divided electrode and the second non-divided electrode, through the dielectric film. The number of first short-direction slits in the portion where the first divided electrode and the second divided electrode face each other is less than the number of first short-direction slits in the portion where the first divided electrode and the second non-divided electrode face each other. Film capacitor.

9. A dielectric film having a first surface and a second surface opposite to the first surface, and extending in a longitudinal direction perpendicular to the short direction, A first electrode arranged on the first surface, The device comprises a second electrode arranged on the second surface, The first electrode and the second electrode face each other via the dielectric film, thereby including four or more even-numbered unit capacitors connected in series in the short-side direction. The first electrode is divided by at least one first margin portion extending in the longitudinal direction into at least one first non-divided electrode extending in the longitudinal direction and at least one first divided electrode, The first divided electrode is divided into a plurality of first small electrode groups arranged in the longitudinal direction by the first short-direction slit portion extending in the short-direction direction, Each of the plurality of first small electrode groups includes a plurality of first small electrodes connected by a first fuse, The second electrode is divided by at least one second margin portion extending in the longitudinal direction, including at least one second non-divided electrode extending in the longitudinal direction and at least one second divided electrode. The second divided electrode is divided into a plurality of second small electrode groups arranged in the longitudinal direction by the second short-direction slit portion extending in the short-direction direction, Each of the aforementioned plurality of second small electrode groups includes a plurality of second small electrodes connected by a second fuse, A portion exists between the first non-divided electrode and the second divided electrode, a portion between the first divided electrode and the second divided electrode, and a portion between the first divided electrode and the second non-divided electrode, through the dielectric film. The width of the first short-direction slit portion in the portion where the first divided electrode and the second divided electrode face each other is smaller than the width of the first short-direction slit portion in the portion where the first divided electrode and the second non-divided electrode face each other. Film capacitor.

10. A dielectric film having a first surface and a second surface opposite to the first surface, and extending in a longitudinal direction perpendicular to the short direction, A first electrode arranged on the first surface, The device comprises a second electrode arranged on the second surface, The first electrode and the second electrode face each other via the dielectric film, thereby including four or more even-numbered unit capacitors connected in series in the short-side direction. The first electrode is divided by at least one first margin portion extending in the longitudinal direction into at least one first non-divided electrode extending in the longitudinal direction and at least one first divided electrode, The first divided electrode is divided into a plurality of first small electrode groups arranged in the longitudinal direction by the first short-direction slit portion extending in the short-direction direction, Each of the plurality of first small electrode groups includes a plurality of first small electrodes connected by a first fuse, The second electrode is divided by at least one second margin portion extending in the longitudinal direction, including at least one second non-divided electrode extending in the longitudinal direction and at least one second divided electrode. The second divided electrode is divided into a plurality of second small electrode groups arranged in the longitudinal direction by the second short-direction slit portion extending in the short-direction direction, Each of the aforementioned plurality of second small electrode groups includes a plurality of second small electrodes connected by a second fuse, A portion exists between the first non-divided electrode and the second divided electrode, a portion between the first divided electrode and the second divided electrode, and a portion between the first divided electrode and the second non-divided electrode, through the dielectric film. The sum of the width of the first short-direction slit portion and the width of the second short-direction slit portion in the portion where the first divided electrode and the second divided electrode face each other is equal to at least one of the width of the first short-direction slit portion in the portion where the first divided electrode and the second non-divided electrode face each other, and the width of the second short-direction slit portion in the portion where the first non-divided electrode and the second divided electrode face each other. Film capacitor.

11. A dielectric film having a first surface and a second surface opposite to the first surface, and extending in a longitudinal direction perpendicular to the short direction, A first electrode arranged on the first surface, The device comprises a second electrode arranged on the second surface, The first electrode and the second electrode face each other via the dielectric film, thereby including four or more even-numbered unit capacitors connected in series in the short-side direction. The first electrode is divided by at least one first margin portion extending in the longitudinal direction into at least one first non-divided electrode extending in the longitudinal direction and at least one first divided electrode, The first divided electrode is divided into a plurality of first small electrode groups arranged in the longitudinal direction by the first short-direction slit portion extending in the short-direction direction, Each of the plurality of first small electrode groups includes a plurality of first small electrodes connected by a first fuse, The second electrode is divided by at least one second margin portion extending in the longitudinal direction, including at least one second non-divided electrode extending in the longitudinal direction and at least one second divided electrode. The second divided electrode is divided into a plurality of second small electrode groups arranged in the longitudinal direction by the second short-direction slit portion extending in the short-direction direction, Each of the aforementioned plurality of second small electrode groups includes a plurality of second small electrodes connected by a second fuse, A portion exists between the first non-divided electrode and the second divided electrode, a portion between the first divided electrode and the second divided electrode, and a portion between the first divided electrode and the second non-divided electrode, through the dielectric film. The number of first short-direction slits in the portion where the first divided electrode and the second divided electrode face each other is less than the number of first short-direction slits in the portion where the first divided electrode and the second non-divided electrode face each other. Film capacitor.

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