JP2024116038A - Film Capacitors and Metallized Films - Google Patents

Abstract

[Problem] To provide a film capacitor capable of increasing fuse sensitivity. [Solution] A film capacitor 1 includes a dielectric film 2 having a first surface 2a and a second surface 2b opposite to the first surface 2a, a first electrode 31 arranged on the first surface 2a, and a second electrode 32 arranged on the second surface 2b and facing the first electrode 31 via the dielectric film 2. The first electrode 31 includes a plurality of regions 4 and a first fuse 51 connecting two of the plurality of regions 4 adjacent to each other in a first direction D1. A first connection portion 61 connecting one of the two regions 4 adjacent to each other in the first direction D1 to the first fuse 51 and a second connection portion 62 connecting the other of the two regions 4 adjacent to each other in the first direction D1 to the first fuse 51 are misaligned when viewed along the first direction D1. In the first fuse 51, two or more bent portions 50 exist between the first connection portion 61 and the second connection portion 62. [Selected Figure] FIG.

Description

This disclosure relates generally to film capacitors and metallized films, and more particularly to film capacitors and metallized films having a dielectric film.

Patent Document 1 discloses a metallized film capacitor. This metallized film capacitor has a pair of vapor-deposited electrodes with insulating margins at different positions, at least two dielectric films, and has metallikon on both end surfaces. The vapor-deposited electrodes are formed into split electrodes on the side closest to the insulating margin, and are connected by a fuse.

JP 2004-134561 A

However, the metallized film capacitor in Patent Document 1 had the problem that it was difficult to increase the sensitivity of the fuse.

The objective of this disclosure is to provide a film capacitor and a metallized film that can increase the sensitivity of a fuse.

A film capacitor according to one aspect of the present disclosure includes a dielectric film having a first surface and a second surface opposite to the first surface, a first electrode disposed on the first surface, and a second electrode disposed on the second surface and facing the first electrode via the dielectric film. The first electrode includes a plurality of regions and a first fuse connecting two of the plurality of regions adjacent in a first direction. A first connection portion connecting one of the two adjacent regions in the first direction to the first fuse and a second connection portion connecting the other of the two adjacent regions in the first direction to the first fuse are misaligned when viewed along the first direction. Two or more bends exist between the first connection portion and the second connection portion in the first fuse.

A metallized film according to one aspect of the present disclosure includes a dielectric film and an electrode disposed on the dielectric film. The electrode includes a plurality of regions and a first fuse connecting two of the plurality of regions adjacent in a first direction. A first connection portion connecting one of the two regions adjacent in the first direction to the first fuse and a second connection portion connecting the other of the two regions adjacent in the first direction to the first fuse are misaligned when viewed along the first direction. Two or more bends exist between the first connection portion and the second connection portion in the first fuse.

This disclosure makes it possible to increase the sensitivity of the fuse.

FIG. 1 is an explanatory diagram showing a film capacitor according to a first embodiment. FIG. 2 is a schematic plan view showing a metallized film used in the film capacitor. 3A to 3C are schematic plan views showing specific examples of the first fuse. 4A and 4B are schematic perspective views showing an example of the film capacitor according to the embodiment of the present invention during the course of manufacturing the film capacitor according to the embodiment of the present invention. FIG. 5 is an explanatory diagram showing a film capacitor according to the second embodiment. FIG. 6 is a schematic plan view showing a metallized film used in the film capacitor. FIG. 7 is an explanatory diagram showing a film capacitor according to a third embodiment. FIG. 8 is a schematic plan view showing a metallized film used in the film capacitor.

1. Overview Fig. 4A shows an example of a film capacitor 1. The film capacitor 1 has, for example, a flattened cylindrical shape.

The film capacitor 1 is manufactured, for example, as shown in FIG. 4B. First, two elongated metallized films 10 (a first metallized film 11 and a second metallized film 12) are stacked and rolled to form a cylindrical body 100.

Here, the first metallized film 11 includes a dielectric film 2 (first dielectric film 21) and a first electrode 31. The first electrode 31 is disposed on one side of the first dielectric film 21. The first electrode 31 is illustrated in a simplified manner in FIG. 4B, but in detail, the first electrode 31 includes a plurality of regions 4 and a first fuse 51 as shown in FIG. 1. The region 4 is not particularly limited, but may be, for example, a first small electrode 91 and a first non-split electrode 81. The first fuse 51 connects two adjacent regions 4 among the plurality of regions 4. Specifically, as shown in FIG. 1, the first fuse 51 connects the first small electrodes 91 to each other. The first fuse 51 also connects the first small electrode 91 and the first non-split electrode 81.

On the other hand, the second metallized film 12 includes a dielectric film 2 (second dielectric film 22) and a second electrode 32. The second electrode 32 is disposed on one side of the second dielectric film 22. The second electrode 32 is also shown in a simplified manner in FIG. 4B, like the first electrode 31, but in detail, the second electrode 32 includes a plurality of regions 4 and a first fuse 51, as shown in FIG. 1. The region 4 is not particularly limited, but may be, for example, a second small electrode 92 and a second non-split electrode 82. The first fuse 51 connects two adjacent regions 4 among the plurality of regions 4. Specifically, as shown in FIG. 1, the first fuse 51 connects the second small electrodes 92 to each other. The first fuse 51 also connects the second small electrode 92 to the second non-split electrode 82.

Next, the side of the cylinder 100 shown in FIG. 4B is pressed and flattened to obtain a flat cylinder 110 (see FIG. 4A). After that, metal is sprayed onto both bottom surfaces (both end surfaces) of the flat cylinder 110 to form end electrodes 300 (first end electrode 301 and second end electrode 302), thereby obtaining the film capacitor 1.

In the film capacitor 1, the first electrode 31 and the second electrode 32 face each other via the dielectric film 2. End electrodes 300 (first end electrode 301 and second end electrode 302) are present on both ends of the film capacitor 1. The first end electrode 301 is connected to the first electrode 31. Meanwhile, the second end electrode 302 is connected to the second electrode 32. The film capacitor 1 can be charged by applying a voltage between the first end electrode 301 and the second end electrode 302.

The first fuse 51 is a part that melts and cuts off the circuit when an excessive current flows. That is, when an excessive current flows through the dielectric film 2 due to dielectric breakdown, the first fuse 51 is cut, thereby protecting the film capacitor 1. The lower the sensitivity of the first fuse 51, the more difficult it is for the first fuse 51 to be cut even when an excessive current flows, which may reduce the reliability of the film capacitor 1. On the other hand, the higher the sensitivity of the first fuse 51, the more easily the first fuse 51 is cut when an excessive current flows, which may increase the reliability of the film capacitor 1.

The inventors have developed a first fuse 51 as shown in Figures 3A to 3C. In order to increase the sensitivity of the first fuse 51, it is possible to increase the electrical resistance of the first fuse 51. In order to increase the electrical resistance of the first fuse 51, for example, it is possible to increase the length of the first fuse 51. For example, in Figure 3A, if the distance (slit width W1) between two adjacent regions 4 in the first direction D1 is widened, the length of the first fuse 51 can be increased, but the area of the region 4 is relatively reduced. As a result, the electrode area of the film capacitor 1 (the area where the first electrode 31 and the second electrode 32 face each other) is reduced, and the capacitance of the film capacitor 1 is reduced. Therefore, from the viewpoint of capacitance, it is preferable that the slit width W1 is as narrow as possible.

In light of the above, in this embodiment, as shown in FIG. 3A, the first connection portion 61a and the second connection portion 62a are offset when viewed along the first direction D1. If the first connection portion 61a and the second connection portion 62a were on the same straight line parallel to the first direction D1, the length of the first fuse 51 linearly connecting the first connection portion 61a and the second connection portion 62a would be the same as the slit width W1. In contrast, in this embodiment, as described above, the first connection portion 61a and the second connection portion 62a are not on the same straight line parallel to the first direction D1, so the length of the first fuse 51 can be made longer than the slit width W1.

Furthermore, in this embodiment, the first fuse 51 has two or more bent portions 50 between the first connection portion 61a and the second connection portion 62a. This allows the length of the first fuse 51 to be even longer than if the first connection portion 61a and the second connection portion 62a were connected in a straight line. This allows the electrical resistance of the first fuse 51 to be increased.

Therefore, according to this embodiment, the sensitivity of the first fuse 51 can be increased.

2. Details (1) First embodiment <Film capacitor>
Hereinafter, the film capacitor 1 according to the first embodiment will be described with reference to FIGS. 1 to 4. Each figure is a schematic diagram, and the ratio of the size and thickness of each component in each figure does not necessarily reflect the actual dimensional ratio. The arrows indicating each direction in each figure are not intended to define the direction when the film capacitor 1 is used, but are merely written to make the explanation easier to understand, and do not have any substance. The first direction D1, the second direction D2, and the third direction D3 are mutually perpendicular. The first direction D1 is the short side direction (width direction) of the dielectric film 2. The second direction D2 is the longitudinal direction of the dielectric film 2. The third direction D3 is the thickness direction of the dielectric film 2. A view along the third direction D3 is called a planar view. The same applies to embodiments other than the first embodiment.

Figure 1 is an explanatory diagram showing a film capacitor 1 according to this embodiment. Specifically, in order to make the following explanation easier to understand, Figure 1 illustrates two metallized films 10 (a first metallized film 11 and a second metallized film 12) that are not wound but are stacked and shifted in the second direction D2.

The film capacitor 1 according to this embodiment includes a dielectric film 2, a first electrode 31, and a second electrode 32. The film capacitor 1 may further include an end electrode 300. Below, the dielectric film 2, the first electrode 31, the second electrode 32, and the end electrode 300 will be described in order.

<Dielectric film>
The dielectric film 2 is a film made of a dielectric material, which is not particularly limited, but may be, for example, polypropylene (PP) or polyethylene terephthalate (PET).

The dielectric film 2 is an elongated film. That is, the dielectric film 2 is a film that has a thickness in the third direction D3, a width in the first direction D1, and extends in the second direction D2.

The dielectric film 2 has a first surface 2a and a second surface 2b (see FIG. 4B). The first surface 2a faces one side of the third direction D3. The second surface 2b is the surface opposite the first surface 2a. In other words, the second surface 2b faces the other side of the third direction D3.

The thickness of the dielectric film 2 is the distance between the first surface 2a and the second surface 2b in the third direction D3. The thickness of the dielectric film 2 is not particularly limited, but is, for example, 1.0 μm or more and 10.0 μm or less.

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

<First electrode>
The first electrode 31 may be any of a vapor deposition electrode, a metal foil electrode, and a plated electrode. The material of the first electrode 31 is not particularly limited, but examples thereof include aluminum (Al), magnesium (Mg), and alloys thereof. The thickness of the first electrode 31 is not particularly limited, but is, for example, 5 nm or more and 100 nm or less.

The first electrode 31 is disposed on the first surface 2a of the dielectric film 2 (first dielectric film 21 in this embodiment). Specifically, as shown in FIG. 1, the first electrode 31 is disposed on the first surface 2a except for the first margin portion 20a. The first margin portion 20a is present at the end on one side (the left side) in the first direction D1. The first margin portion 20a is a narrow strip-shaped portion. In other words, the first margin portion 20a is a portion that has a width in the first direction D1 and extends in the second direction D2.

The first electrode 31 includes a first split electrode 71 and a first non-split electrode 81.

The first split electrode 71 occupies approximately half of one side (left side) of the first surface 2a in the first direction D1. The first split electrode 71 exists between the first margin portion 20a and the first non-split electrode 81. The first split electrode 71 includes a plurality of first small electrodes 91. In this manner, the first split electrode 71 is split into a plurality of first small electrodes 91. The plurality of first small electrodes 91 are aligned in the first direction D1 and the second direction D2. In this embodiment, four first small electrodes 91 are aligned in the first direction D1. In this embodiment, the shape of the first small electrodes 91 in a plan view is a quadrilateral, but is not particularly limited to this.

The first unsplit electrode 81 occupies approximately half of the other side (right side) of the first surface 2a in the first direction D1. The first unsplit electrode 81 is solid and extends in the second direction D2. In this way, the first unsplit electrode 81 is not split into multiple first small electrodes 91.

The first electrode 31 includes a plurality of regions 4 and a first fuse 51. Here, each of the first small electrodes 91 and the first non-split electrodes 81 corresponds to one region 4. On the other hand, the first split electrode 71 includes a plurality of first small electrodes 91, and therefore does not correspond to one region 4.

The first fuse 51 is a part that melts when an excessive current flows, thereby breaking the circuit. The first fuse 51 connects two of the multiple regions 4 that are adjacent in the first direction D1. Specifically, the first fuse 51 connects two first small electrodes 91 that are adjacent in the first direction D1. The first fuse 51 also connects the first small electrodes 91 and the first non-split electrode 81 that are adjacent in the first direction D1.

In this embodiment, as shown in FIG. 3A, the first connection portion 61a and the second connection portion 62a are offset when viewed along the first direction D1. In other words, the first connection portion 61a and the second connection portion 62a are not on the same straight line parallel to the first direction D1.

Here, the first connection portion 61a is a portion that connects one of the two regions 4 adjacent to each other in the first direction D1 (the first small electrode 91 on the left side in FIG. 3A) to the first fuse 51. On the other hand, the second connection portion 62a is a portion that connects the other of the two regions 4 adjacent to each other in the first direction D1 (the first small electrode 91 on the right side in FIG. 3A) to the first fuse 51.

Furthermore, in this embodiment, the first fuse 51 is smoothly bent in a plan view. Specifically, as shown in FIG. 3A, the first fuse 51 has two or more bent portions 50 (eight in FIG. 3A) between the first connection portion 61a and the second connection portion 62a. The bent portions 50 are bent portions.

Also, as shown in FIG. 3B, the first fuse 51 may be bent in a zigzag pattern in plan view. In the first fuse 51 shown in FIG. 3B, six bent portions 50 exist between the first connection portion 61a and the second connection portion 62a.

Furthermore, as shown in FIG. 3C, the first fuse 51 may be bent in a Z-shape in plan view. In the first fuse 51 shown in FIG. 3C, two bent portions 50 exist between the first connection portion 61a and the second connection portion 62a.

<Second electrode>
The second electrode 32 may be any one of a vapor deposition electrode, a metal foil electrode, and a plated electrode, similar to the first electrode 31. The material and thickness of the second electrode 32 are the same as those of the first electrode 31.

The second electrode 32 is disposed on the second surface 2b of the dielectric film 2 (the first dielectric film 21 in this embodiment). The second electrode 32 faces the first electrode 31 via the dielectric film 2.

Here, the second electrode 32 can also be said to be disposed on the first surface 2a of the second dielectric film 22. Therefore, unless otherwise specified, this case will be described below. As shown in FIG. 1, the second electrode 32 is disposed on the first surface 2a in a location other than the second margin portion 20b. The second margin portion 20b is present at the end on the other side (right side) of the first direction D1. The second margin portion 20b is a narrow strip-shaped portion. In other words, the second margin portion 20b is a portion that has a width in the first direction D1 and extends in the second direction D2.

The second electrode 32 includes a second split electrode 72 and a second unsplit electrode 82.

The second split electrode 72 occupies approximately half of the other side (right side) of the first surface 2a in the first direction D1. The second split electrode 72 exists between the second margin portion 20b and the second non-split electrode 82. The second split electrode 72 includes a plurality of second small electrodes 92. In this manner, the second split electrode 72 is split into a plurality of second small electrodes 92. The plurality of second small electrodes 92 are aligned in the first direction D1 and the second direction D2. In this embodiment, four second small electrodes 92 are aligned in the first direction D1. In this embodiment, the second small electrodes 92 have the same shape and size as the first small electrodes 91, but this is not particularly limited.

The second split electrode 72 faces the first unsplit electrode 81 via the dielectric film 2. More specifically, the second small electrodes 92 face the first unsplit electrode 81 via the dielectric film 2.

The second unsplit electrode 82 occupies approximately half of one side (left side) of the first surface 2a in the first direction D1. The second unsplit electrode 82 is solid and extends in the second direction D2. In this way, the second unsplit electrode 82 is not split into multiple second small electrodes 92.

The second undivided electrode 82 faces the first divided electrode 71 through the dielectric film 2. More specifically, the second undivided electrode 82 faces the first small electrodes 91 through the dielectric film 2.

The second electrode 32, like the first electrode 31, includes multiple regions 4 and a first fuse 51. However, here, each of the second small electrode 92 and the second non-split electrode 82 corresponds to one region 4. On the other hand, the second split electrode 72 includes multiple second small electrodes 92, and therefore does not correspond to one region 4.

In the second electrode 32, similarly to the first electrode 31, the first fuse 51 connects two of the multiple regions 4 that are adjacent in the first direction D1. Specifically, the first fuse 51 connects two second small electrodes 92 that are adjacent in the first direction D1. The first fuse 51 also connects the second small electrodes 92 and the second non-split electrode 82 that are adjacent in the first direction D1. In this way, except for the connection objects, the configuration of the first fuse 51 of the second electrode 32 is the same as the configuration of the first fuse 51 of the first electrode 31.

<End electrode>
The material of the end electrode 300 is not particularly limited, but may be, for example, zinc (Zn), tin (Sn), or an alloy thereof. The thickness of the end electrode 300 is not particularly limited, but may be, for example, 0.5 mm or more and 1.5 mm or less. The method of forming the end electrode 300 is not particularly limited, but may be, for example, metal spraying. The end electrode 300 includes a first end electrode 301 and a second end electrode 302.

The first end electrode 301 is connected to the first electrode 31 but not to the second electrode 32. This is because the second margin portion 20b exists between the first end electrode 301 and the second electrode 32 (see FIG. 1). The first end electrode 301 is disposed on the other side (right side) of the first direction D1. The first end electrode 301 is connected to the first non-split electrode 81.

On the other hand, the second end electrode 302 is connected to the second electrode 32 but not to the first electrode 31. This is because the first margin portion 20a exists between the second end electrode 302 and the first electrode 31 (see FIG. 1). The second end electrode 302 is disposed on one side (the left side) of the first direction D1. The second end electrode 302 is connected to the second non-split electrode 82.

<Metallized film>
2 shows metallized film 10 (particularly first metallized film 11) according to the present embodiment. As described above, metallized film 10 is used in the manufacture of film capacitor 1. Metallized film 10 can be used as first metallized film 11 or second metallized film 12 by rotating it 180° in a plan view.

The metallized film 10 is in the form of an elongated film. That is, the metallized film 10 is a film having a thickness in the third direction D3, a width in the first direction D1, and extending in the second direction D2. The metallized film 10 includes a dielectric film 2 and an electrode 3.

Specifically, the first metallized film 11 includes a first dielectric film 21 and a first electrode 31. The first dielectric film 21 and the first electrode 31 are as described above.

On the other hand, the second metallized film 12 includes a second dielectric film 22 and a second electrode 32. The second dielectric film 22 and the second electrode 32 are as described above.

<Action and effect>
According to this embodiment, the sensitivity of the first fuse 51 can be increased for the following reasons.

In this embodiment, as shown in FIG. 3A, the first connection portion 61a and the second connection portion 62a are offset when viewed along the first direction D1. If the first connection portion 61a and the second connection portion 62a were on the same straight line parallel to the first direction D1, the length of the first fuse 51 that linearly connects the first connection portion 61a and the second connection portion 62a would be the same as the slit width W1.

In contrast, in this embodiment, as described above, the first connection portion 61a and the second connection portion 62a are not on the same straight line parallel to the first direction D1, so the length of the first fuse 51 can be made longer than the slit width W1.

Furthermore, in this embodiment, the first fuse 51 has two or more bent portions 50 between the first connection portion 61a and the second connection portion 62a. This allows the length of the first fuse 51 to be even longer than if the first connection portion 61a and the second connection portion 62a were connected in a straight line. This allows the electrical resistance of the first fuse 51 to be increased.

Therefore, according to this embodiment, the sensitivity of the first fuse 51 can be increased.

In this way, the sensitivity of the first fuse 51 is increased by increasing the length of the first fuse 51, so even if the thickness of the first electrode 31 and the second electrode 32 is increased, the effect on the sensitivity of the first fuse 51 is small. The thicker the first electrode 31 and the second electrode 32 are, the smaller the electrical resistance of the first electrode 31 and the second electrode 32 can be. Therefore, it is possible to maintain a high sensitivity of the first fuse 51 while reducing heat generation during operation of the film capacitor 1.

(2) Second embodiment <Film capacitor>
Next, a film capacitor 1 according to a second embodiment will be described with reference to Fig. 5 and Fig. 6. In the second embodiment, components similar to those in the first embodiment are given the same reference numerals as those in the first embodiment, and detailed description thereof may be omitted. Components in the second embodiment that are not mentioned in particular are similar to those in the first embodiment.

The second embodiment differs from the first embodiment in that each of the first electrode 31 and the second electrode 32 further includes a second fuse 52.

<First electrode>
In this embodiment, the first electrode 31 further includes a second fuse 52. Like the first fuse 51, the second fuse 52 is a part that melts when an excessive current flows to interrupt the circuit. The second fuse 52 connects two of the multiple regions 4 that are adjacent to each other in the second direction D2. Specifically, the second fuse 52 connects two first small electrodes 91 that are adjacent to each other in the second direction D2.

In this embodiment, the first connection portion 61b and the second connection portion 62b are offset when viewed along the second direction D2. In other words, the first connection portion 61b and the second connection portion 62b are not on the same straight line parallel to the second direction D2.

Here, the first connection portion 61b is a portion that connects one of the two regions 4 adjacent to each other in the second direction D2 to the second fuse 52. On the other hand, the second connection portion 62b is a portion that connects the other of the two regions 4 adjacent to each other in the second direction D2 to the second fuse 52.

Furthermore, in this embodiment, as in the case of the first fuse 51, in the second fuse 52, there are two or more bent portions 50 between the first connection portion 61b and the second connection portion 62b. Thus, except for the difference in the connection direction, the configuration of the second fuse 52 is the same as the configuration of the first fuse 51.

<Second electrode>
In this embodiment, the second electrode 32 further includes a second fuse 52, similar to the first electrode 31. That is, the second fuse 52 connects two of the multiple regions 4 that are adjacent to each other in the second direction D2. Specifically, the second fuse 52 connects two second small electrodes 92 that are adjacent to each other in the second direction D2. In this way, except for the connection objects, the configuration of the second fuse 52 of the second electrode 32 is similar to the configuration of the second fuse 52 of the first electrode 31.

<Metallized film>
6 shows metallized film 10 according to this embodiment (particularly first metallized film 11). Metallized film 10 according to the second embodiment differs from metallized film 10 according to the first embodiment in that electrode 3 further includes second fuse 52. The other points are the same.

<Action and effect>
In the present embodiment, similarly to the first embodiment, the sensitivity of the first fuse 51 can be increased. In addition, in the present embodiment, the sensitivity of the second fuse 52 can also be increased due to the same action as the first fuse 51.

Furthermore, according to this embodiment, excessive decrease in the capacitance of the film capacitor 1 during insulation breakdown can be suppressed for the following reasons.

For example, in FIG. 1, if insulation breakdown occurs in the portion of one first small electrode 91 surrounded by dashed line X1 and the first fuses 51 on both sides of this first small electrode 91 in the first direction D1 are cut, the three first small electrodes 91 surrounded by dashed line Y1 are isolated. This may result in a decrease in capacitance equivalent to four first small electrodes 91.

In contrast, in this embodiment, as shown in FIG. 5, a second fuse 52 exists for each first small electrode 91. Therefore, even if insulation breakdown occurs in the portion of one first small electrode 91 surrounded by the dashed line X2 and the first fuses 51 on both sides of this first small electrode 91 in the first direction D1 and the second fuses 52 on both sides of the second direction D2 are cut, the isolation of the three first small electrodes 91 surrounded by the dashed line Y2 is suppressed. This is because these first small electrodes 91 are connected to the first small electrodes 91 adjacent to them in the second direction D2 by the second fuses 52. As a result, the capacitance is only reduced by an amount equivalent to one first small electrode 91 surrounded by the dashed line X2.

Therefore, according to this embodiment, it is possible to suppress an excessive decrease in the capacitance of the film capacitor 1 in the event of dielectric breakdown. Moreover, since the shape of the second fuse 52 is similar to the shape of the first fuse 51, the sensitivity of the second fuse 52 can also be increased.

(3) Third embodiment <Film capacitor>
Next, a film capacitor 1 according to a third embodiment will be described with reference to Figures 7 and 8. In the third embodiment, components similar to those in the first and second embodiments are given the same reference numerals as in the first and second embodiments, and detailed descriptions thereof may be omitted. Components in the third embodiment that are not mentioned in particular are similar to those in the first and second embodiments.

In the third embodiment, the shape of the second fuse 52 differs from the shape of the second fuse 52 in the second embodiment.

<First electrode>
In the present embodiment, the first connection portion 61b and the second connection portion 62b coincide with each other when viewed along the second direction D2. In other words, the first connection portion 61b and the second connection portion 62b are on the same straight line parallel to the second direction D2.

Furthermore, in this embodiment, the second fuse 52 is linear and extends in the second direction D2. That is, in the second fuse 52, there is no bent portion 50 between the first connection portion 61b and the second connection portion 62b.

<Second electrode>
Except for the connection target of the second fuse 52 , the configuration of the second fuse 52 of the second electrode 32 is similar to the configuration of the second fuse 52 of the first electrode 31 .

<Metallized film>
8 shows metallized film 10 according to this embodiment (particularly first metallized film 11). Metallized film 10 according to the third embodiment differs from metallized film 10 according to the second embodiment in the shape of second fuse 52. All other points are the same.

<Action and effect>
Like the first and second embodiments, this embodiment can also increase the sensitivity of the first fuse 51. Also, like the second embodiment, this embodiment can also suppress an excessive decrease in the capacitance of the film capacitor 1 at the time of dielectric breakdown.

Furthermore, in this embodiment, the second fuse 52 is linear and extends in the second direction D2, so the distance between two adjacent regions 4 in the second direction D2 (slit width W2) can be made as narrow as possible (see FIG. 7). This allows the area of the regions 4 to be relatively increased.

Therefore, the capacitance of the film capacitor 1 can be increased.

3. Modifications The first to third embodiments are merely examples of various embodiments of the present disclosure. The first to third embodiments can be modified in various ways depending on the design, etc., as long as the object of the present disclosure can be achieved.

When multiple first fuses 51 are present along the first direction D1 in the first split electrode 71 of the first electrode 31, the length of the first fuses 51 may be increased with increasing distance from the first end electrode 301. This makes it possible to equalize the sensitivity of the first fuses 51 for the following reasons.

In other words, when multiple first fuses 51 exist along the first direction D1, when a voltage is applied between the end electrodes 300, the current flowing through the first fuses 51 located farther from the first end electrode 301 tends to be smaller than the current flowing through the first fuses 51 located closer to the first end electrode 301.

Therefore, if the lengths of the multiple first fuses 51 arranged along the first direction D1 are uniformly the same, even if the sensitivity of the first fuses 51 located near the first end electrode 301 is high, the sensitivity of the first fuses 51 located far from the first end electrode 301 may be low.

Therefore, if the length of the first fuses 51 is made to increase with distance from the first end electrode 301 in the first direction D1, the sensitivity of the first fuses 51 located far from the first end electrode 301 can be increased as well as the sensitivity of the first fuses 51 located near the first end electrode 301. In other words, the difference in sensitivity between the multiple first fuses 51 lined up along the first direction D1 can be reduced. Therefore, the sensitivity of the first fuses 51 can be made uniform.

For the same reason as above, when multiple first fuses 51 are present along the first direction D1 in the second divided electrode 72 of the second electrode 32, the length of the first fuses 51 may be increased with increasing distance from the second end electrode 302.

As is apparent from the above-described embodiment and modified examples, the present disclosure includes the following aspects. In the following, reference symbols are given in parentheses only to clarify the correspondence with the embodiment.

The first aspect is a film capacitor (1) including a dielectric film (2) having a first surface (2a) and a second surface (2b) opposite to the first surface (2a), a first electrode (31) disposed on the first surface (2a), and a second electrode (32) disposed on the second surface (2b) and facing the first electrode (31) via the dielectric film (2). The first electrode (31) includes a plurality of regions (4) and a first fuse (51) connecting two adjacent regions (4) of the plurality of regions (4) in a first direction (D1). A first connection portion (61a) that connects one of the two regions (4) adjacent in the first direction (D1) to the first fuse (51) and a second connection portion (62a) that connects the other of the two regions (4) adjacent in the first direction (D1) to the first fuse (51) are misaligned when viewed along the first direction (D1). Two or more bent portions (50) exist between the first connection portion (61a) and the second connection portion (62a) in the first fuse (51).

According to this embodiment, the sensitivity of the first fuse (51) can be increased.

The second aspect is a film capacitor (1) based on the first aspect. In the second aspect, the first electrode (31) further includes a second fuse (52) that connects two adjacent areas (4) of the plurality of areas (4) in a second direction (D2) perpendicular to the first direction (D1).

According to this embodiment, excessive decrease in the capacitance of the film capacitor (1) during insulation breakdown can be suppressed.

The third aspect is a film capacitor (1) based on the second aspect. In the third aspect, a first connection portion (61b) that connects one of the two regions (4) adjacent in the second direction (D2) to the second fuse (52) and a second connection portion (62b) that connects the other of the two regions (4) adjacent in the second direction (D2) to the second fuse (52) are misaligned when viewed along the second direction (D2). Two or more bends (50) are present between the first connection portion (61b) and the second connection portion (62b) in the second fuse (52).

According to this embodiment, the sensitivity of the second fuse (52) can be increased.

The fourth aspect is a film capacitor (1) based on any one of the first to third aspects. In the fourth aspect, the second electrode (32) includes a plurality of regions (4) and a first fuse (51a) that connects two regions (4) adjacent to each other in a first direction (D1) among the plurality of regions (4). A first connection portion (61a) that connects one of the two regions (4) adjacent to each other in the first direction (D1) to the first fuse (51) and a second connection portion (62a) that connects the other of the two regions (4) adjacent to each other in the first direction (D1) to the first fuse (51) are misaligned when viewed along the first direction (D1). Two or more bends (50) are present between the first connection portion (61a) and the second connection portion (62a) in the first fuse (51).

According to this embodiment, the sensitivity of the first fuse (51) of the first electrode (31) and the second electrode (32) can be increased.

The fifth aspect is a film capacitor (1) based on the fourth aspect. In the fifth aspect, the second electrode (32) further includes a second fuse (52) that connects two adjacent areas (4) of the plurality of areas (4) in a second direction (D2) perpendicular to the first direction (D1).

According to this embodiment, excessive decrease in the capacitance of the film capacitor (1) during insulation breakdown can be suppressed.

The sixth aspect is a film capacitor (1) based on the fifth aspect. In the sixth aspect, a first connection portion (61b) that connects one of the two regions (4) adjacent in the second direction (D2) to the second fuse (52) and a second connection portion (62b) that connects the other of the two regions (4) adjacent in the second direction (D2) to the second fuse (52) are misaligned when viewed along the second direction (D2). Two or more bends (50) are present between the first connection portion (61b) and the second connection portion (62b) in the second fuse (52).

According to this embodiment, the sensitivity of the second fuse (52) of the second electrode (32) can be increased.

The seventh aspect is a metallized film (10) comprising a dielectric film (2) and an electrode (3) disposed on the dielectric film (2). The electrode (3) includes a plurality of regions (4) and a first fuse (51) connecting two regions (4) adjacent to each other in a first direction (D1) among the plurality of regions (4). A first connection portion (61a) connecting one of the two regions (4) adjacent to each other in the first direction (D1) to the first fuse (51) and a second connection portion (62a) connecting the other of the two regions (4) adjacent to each other in the first direction (D1) to the first fuse (51) are misaligned when viewed along the first direction (D1). Two or more bends (50) are present between the first connection portion (61a) and the second connection portion (62a) in the first fuse (51).

According to this embodiment, the sensitivity of the first fuse (51) can be increased.

The eighth aspect is a metallized film (10) based on the seventh aspect. In the eighth aspect, the electrode (3) further includes a second fuse (52) that connects two adjacent regions (4) of the plurality of regions (4) in a second direction (D2) perpendicular to the first direction (D1).

According to this embodiment, excessive decrease in the capacitance of the film capacitor (1) during insulation breakdown can be suppressed.

The ninth aspect is a metallized film (10) based on the eighth aspect. In the ninth aspect, a first connection portion (61b) that connects one of the two regions (4) adjacent in the second direction (D2) to the second fuse (52) and a second connection portion (62b) that connects the other of the two regions (4) adjacent in the second direction (D2) to the second fuse (52) are misaligned when viewed along the second direction (D2). Two or more bends (50) are present between the first connection portion (61b) and the second connection portion (62b) in the second fuse (52).

According to this embodiment, the sensitivity of the second fuse (52) can be increased.

REFERENCE SIGNS LIST 1 film capacitor 2 dielectric film 2a first surface 2b second surface 3 electrode 31 first electrode 32 second electrode 4 region 5 fuse 51 first fuse 52 second fuse 61a first connection portion 61b first connection portion 62a second connection portion 62b second connection portion 10 metallized film D1 first direction D2 second direction

Claims (9)

a dielectric film having a first surface and a second surface opposite to the first surface, a first electrode disposed on the first surface, and a second electrode disposed on the second surface and facing the first electrode with the dielectric film interposed therebetween;
the first electrode includes a plurality of regions and a first fuse connecting two regions adjacent to each other in a first direction among the plurality of regions;
a first connection portion that connects one of two regions adjacent to each other in the first direction to the first fuse and a second connection portion that connects the other of the two regions adjacent to each other in the first direction to the first fuse are misaligned when viewed along the first direction,
In the first fuse, two or more bent portions are present between the first connection portion and the second connection portion.
Film capacitor. the first electrode further includes a second fuse connecting two adjacent regions of the plurality of regions in a second direction perpendicular to the first direction;
The film capacitor according to claim 1 . a first connection portion that connects one of the two regions adjacent in the second direction to the second fuse and a second connection portion that connects the other of the two regions adjacent in the second direction to the second fuse are misaligned when viewed along the second direction,
In the second fuse, two or more bent portions are present between the first connection portion and the second connection portion.
The film capacitor according to claim 2 . the second electrode includes a plurality of regions and a first fuse connecting two regions adjacent to each other in a first direction among the plurality of regions;
a first connection portion that connects one of two regions adjacent to each other in the first direction to the first fuse and a second connection portion that connects the other of the two regions adjacent to each other in the first direction to the first fuse are misaligned when viewed along the first direction,
In the first fuse, two or more bent portions are present between the first connection portion and the second connection portion.
The film capacitor according to claim 1 . the second electrode further includes a second fuse connecting two adjacent regions of the plurality of regions in a second direction perpendicular to the first direction;
The film capacitor according to claim 4. a first connection portion that connects one of the two regions adjacent in the second direction to the second fuse and a second connection portion that connects the other of the two regions adjacent in the second direction to the second fuse are misaligned when viewed along the second direction,
In the second fuse, two or more bent portions are present between the first connection portion and the second connection portion.
The film capacitor according to claim 5 . A dielectric film and an electrode disposed on the dielectric film,
the electrode includes a plurality of regions and a first fuse connecting two of the plurality of regions adjacent to each other in a first direction;
a first connection portion that connects one of two regions adjacent to each other in the first direction to the first fuse and a second connection portion that connects the other of the two regions adjacent to each other in the first direction to the first fuse are misaligned when viewed along the first direction,
In the first fuse, two or more bent portions are present between the first connection portion and the second connection portion.
Metallized film. the electrode further includes a second fuse connecting two adjacent regions of the plurality of regions in a second direction perpendicular to the first direction;
The metallized film of claim 7. a first connection portion that connects one of the two regions adjacent in the second direction to the second fuse and a second connection portion that connects the other of the two regions adjacent in the second direction to the second fuse are misaligned when viewed along the second direction,
In the second fuse, two or more bent portions are present between the first connection portion and the second connection portion.
9. The metallized film of claim 8.

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