Film capacitor and metallized film

Abstract

To provide a film capacitor capable of enhancing a sensitivity of a fuse.SOLUTION: A film capacitor 1 comprises: a dielectric film 2 that includes a first surface 201 and a second surface 202 on the side opposite to the first surface 201; a first electrode 31 that is arranged on the first surface 201; and a second electrode 32 that is arranged on the second surface 202, and faces the first electrode 31 via the dielectric film 2. The first electrode 31 contains: a plurality of small electrodes 6 that are arranged in a matrix shape formed of a plurality of columns and a plurality of rows; and a first fuse 71 that connects one small electrode 6 of the plurality of small electrodes 6 and the other small electrode 6 existing in the column and row different from those of the one small electrode 6. Each of the plurality of small electrodes 6 has a polygonal shape having at least three sides and tops. The first fuse 71 connects a side of the one small electrode 6 with the side or the top of the other small electrode 6.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] FIELD OF THE DISCLOSURE This disclosure relates generally to film capacitors and metallized films, and more particularly to film capacitors and metallized films comprising dielectric films. [Background technology]

[0002] 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 closer to the insulating margin, and are connected by a fuse. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2004-134561 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the metallized film capacitor of Patent Document 1 has a problem in that it is difficult to increase the sensitivity of the fuse.

[0005] An object of the present disclosure is to provide a film capacitor and a metallized film that can increase fuse sensitivity. [Means for solving the problem]

[0006] A film capacitor according to one embodiment 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 small electrodes arranged in a matrix of a plurality of rows and a plurality of columns, and a first fuse connecting one small electrode of the plurality of small electrodes to another small electrode present in a row and column different from the one small electrode. Each of the plurality of small electrodes is polygonal having at least three sides and vertices. The first fuse connects a side of the one small electrode to a side or vertex of the other small electrode.

[0007] A metallized film according to one embodiment of the present disclosure includes a dielectric film and an electrode disposed on the dielectric film. The electrode includes a plurality of small electrodes arranged in a matrix of a plurality of rows and a plurality of columns, and a first fuse connecting one of the plurality of small electrodes to another small electrode that is in a different row and column from the one small electrode. Each of the plurality of small electrodes is polygonal having at least three sides and vertices. The first fuse connects a side of the one small electrode to a side or vertex of the other small electrode. Effect of the Invention

[0008] According to the present disclosure, the sensitivity of the fuse can be increased. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is an explanatory diagram showing a film capacitor according to a first embodiment. [Diagram 2] FIG. 2 is a schematic plan view showing an enlarged view of a portion including a first fuse in the film capacitor. [Diagram 3] FIG. 3 is a schematic plan view showing a first modified example of the first fuse. [Figure 4] FIG. 4 is a schematic plan view showing a second modified example of the first fuse. [Diagram 5]FIG. 5 is a schematic plan view showing a third modified example of the first fuse. [Figure 6] FIG. 6 is a schematic plan view showing a metallized film used in the film capacitor. [Figure 7] Fig. 7A is a schematic perspective view showing an example of the film capacitor of the same embodiment, and Fig. 7B is a schematic perspective view showing a state in the middle of manufacturing the same. [Figure 8] FIG. 8 is an explanatory diagram showing a film capacitor according to a second embodiment. [Figure 9] FIG. 9 is a schematic plan view showing an enlarged view of a portion including a second fuse in the film capacitor of the above embodiment. [Figure 10] FIG. 10 is a schematic plan view showing a first modified example of the second fuse. [Figure 11] FIG. 11 is a schematic plan view showing a second modified example of the second fuse. [Figure 12] FIG. 12 is a schematic plan view showing a third modified example of the second fuse. [Figure 13] FIG. 13 is a schematic plan view showing a metallized film used in the film capacitor. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] 1. Overview 7A shows an example of the film capacitor 1 according to this embodiment. The film capacitor 1 has, for example, a flattened cylindrical shape.

[0011] The above-mentioned film capacitor 1 is manufactured, for example, as shown in Fig. 7B. First, two elongated metallized films 10 (first metallized film 11 and second metallized film 12) are overlapped and wound to form a cylindrical body 100.

[0012] Here, first metallized film 11 includes dielectric film 2 (first dielectric film 21) and first electrode 31. First electrode 31 is disposed on one side of first dielectric film 21. First electrode 31 is illustrated in a simplified manner in FIG. 7B, but in detail, first electrode 31 includes a plurality of small electrodes 6 and a first fuse 71 as shown in FIG. 1. First fuse 71 connects one small electrode 6 to another small electrode 6. Specifically, first fuse 71 connects small electrode 6A to small electrode 6B as shown in FIG. 2.

[0013] On the other hand, second metallized film 12 includes dielectric film 2 (second dielectric film 22) and second electrode 32. Second electrode 32 is disposed on one side of second dielectric film 22. Like first electrode 31, second electrode 32 is also shown in a simplified manner in FIG. 7B, but in detail, second electrode 32 includes a plurality of small electrodes 6 and a first fuse 71 as shown in FIG. 1. First fuse 71 connects one small electrode 6 to another small electrode 6. Specifically, first fuse 71 connects small electrode 6A to small electrode 6B as shown in FIG. 2.

[0014] Next, the side surface of the cylinder 100 shown in Fig. 7B is pressed and flattened to obtain a flat cylinder 110 (see Fig. 7A). 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.

[0015] In the above-described 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. Then, by applying a voltage between the first end electrode 301 and the second end electrode 302, the film capacitor 1 can be charged.

[0016] Here, the first fuse 71 is a part that melts when an excessive current flows and breaks the circuit. That is, when an excessive current flows through the dielectric film 2 due to dielectric breakdown, the first fuse 71 is cut, thereby protecting the film capacitor 1. The lower the sensitivity of the first fuse 71, the more difficult it is for the first fuse 71 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 71, the more easily the first fuse 71 is cut when an excessive current flows, which may increase the reliability of the film capacitor 1.

[0017] Therefore, in order to improve the reliability of the film capacitor 1, the present inventors have developed a first fuse 71 as shown in Figs. 2 to 5. In order to increase the sensitivity of the first fuse 71, it is considered to increase the electrical resistance of the first fuse 71. In order to increase the electrical resistance of the first fuse 71, it is considered to increase the length of the first fuse 71, for example.

[0018] For example, in FIG. 2, consider a case where two small electrodes 6 (small electrodes 6A and 6F) adjacent to each other in the first direction D1 are connected by a fuse 70. The fuse 70 is shown by an imaginary line (two-dot chain line). In this case, if the distance (slit width W1) between the small electrodes 6A and 6F is widened, the length of the fuse 70 can be increased, but the area of ​​the small electrodes 6 is relatively reduced. As a result, the electrode area (area where the first electrode 31 and the second electrode 32 face each other) of the film capacitor 1 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.

[0019] In consideration of the above, in this embodiment, as shown in FIG. 2, the first fuses 71 connect small electrodes 6 that exist in different rows and columns.

[0020] In FIG. 2, if the first direction D1 is the row direction, the small electrodes 6A and 6F are in the same row, and the small electrodes 6B and 6E are in the same row. If the second direction D2 is the column direction, the small electrodes 6A and 6E are in the same column, and the small electrodes 6B and 6F are in the same column. In this way, the row and column in which the small electrode 6A exists are different from the row and column in which the small electrode 6B exists. The first fuse 71 connects the small electrodes 6A and 6B, and also connects the small electrodes 6 having the same positional relationship as the positional relationship of the small electrodes 6A and 6B. In this embodiment, the first fuse 71 does not connect two small electrodes 6 adjacent to each other in the first direction D1, so the length of the first fuse 71 can be made longer than the slit width W1. This makes it possible to increase the electrical resistance of the first fuse 71.

[0021] Therefore, according to this embodiment, it is possible to increase the sensitivity of the first fuse 71. The first fuse 71 shown in Figs.

[0022] 2.Details (1) First embodiment <Film capacitor> Hereinafter, a film capacitor 1 according to a first embodiment will be described with reference to Fig. 1 to Fig. 7B. Each figure is a schematic diagram, and the ratio of sizes and thicknesses of each component in each figure does not necessarily reflect the actual dimensional ratio.

[0023] 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 depicted to make the explanation easier to understand, and have no 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, and is sometimes called the "row direction". The second direction D2 is the long side direction of the dielectric film 2, and is sometimes called the "column direction". 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.

[0024] Fig. 1 is an explanatory diagram showing a film capacitor 1 according to the present embodiment. Specifically, in order to facilitate understanding of the following description, Fig. 1 illustrates two metallized films 10 (first metallized film 11 and second metallized film 12) that are not wound but are stacked with a shift in a second direction D2.

[0025] 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.

[0026] <Dielectric film> The dielectric film 2 is a film made of a dielectric material, which is not particularly limited, but examples thereof include polypropylene (PP) and polyethylene terephthalate (PET).

[0027] The dielectric film 2 has an elongated film shape, that is, the dielectric film 2 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.

[0028] The dielectric film 2 has a first surface 201 and a second surface 202 (see FIG. 7B). The first surface 201 is a surface facing one side in the third direction D3. The second surface 202 is a surface opposite to the first surface 201. In other words, the second surface 202 is a surface facing the other side in the third direction D3.

[0029] The thickness of the dielectric film 2 is the distance between the first surface 201 and the second surface 202 in the third direction D3. The thickness of the dielectric film 2 is not particularly limited, but is, for example, not less than 1.0 μm and not more than 10.0 μm.

[0030] In this embodiment, the dielectric film 2 includes a first dielectric film 21 and a second dielectric film 22.

[0031] ≪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 may be, for example, aluminum (Al), magnesium (Mg), or an alloy thereof. The thickness of the first electrode 31 is not particularly limited, but may be, for example, 5 nm or more and 100 nm or less.

[0032] The first electrode 31 is disposed on a first surface 201 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 201 except for the first margin portion 20a. The first margin portion 20a exists at an 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.

[0033] The first electrode 31 includes a first split electrode 41 , a first unsplit electrode 51 , and a first fuse 71 .

[0034] The first split electrode 41 occupies approximately half of one side (left side) in the first direction D1 on the first surface 201. The first split electrode 41 is present between the first margin portion 20a and the first non-split electrode 51. The first split electrode 41 includes a plurality of small electrodes 6. In this manner, the first split electrode 41 is split into a plurality of small electrodes 6.

[0035] On the other hand, the first undivided electrode 51 occupies approximately half of the other side (right side) in the first direction D1 on the first surface 201. The first undivided electrode 51 is solid and extends in the second direction D2. In this manner, the first undivided electrode 51 is not divided into a plurality of small electrodes 6.

[0036] The small electrodes 6 included in the first divided electrode 41 are arranged in a matrix of rows and columns. That is, the small electrodes 6 are lined up in a first direction D1 (row direction) and a second direction D2 (column direction). In this embodiment, four small electrodes 6 are lined up in the first direction D1.

[0037] Each of the small electrodes 6 has a polygonal shape having at least three sides and vertices. In this embodiment, as shown in Fig. 2, the small electrodes 6 have a quadrangle shape having vertices A, B, C, and D in a plan view. Sides BC and DA are parallel to the first direction D1. Meanwhile, sides AB and CD are parallel to the second direction D2.

[0038] The first fuse 71 is a part that melts when an excessive current flows, thereby breaking the circuit.

[0039] The first fuse 71 connects the one small electrode 6 and the other small electrode 6. When an excessive current flows between the one small electrode 6 and the other small electrode 6, the first fuse 71 melts and cuts off the electrical connection between the one small electrode 6 and the other small electrode 6. Needless to say, the width of the first fuse 71 is shorter than the length of each side of the polygon formed by the small electrodes 6. The meanings of "the one small electrode 6" and "the other small electrode 6" will be described later.

[0040] Furthermore, the first fuse 71 connects the first split electrode 41 and the first unsplit electrode 51. Specifically, the first fuse 71 connects the small electrode 6 included in the first split electrode 41 and the first unsplit electrode 51. The small electrode 6 connected to the first unsplit electrode 51 is adjacent to the first unsplit electrode 51 in the first direction D1.

[0041] Here, the meaning of the above-mentioned "one small electrode 6" and "other small electrodes 6" will be explained. "One small electrode 6" means any small electrode 6 among the multiple small electrodes 6. On the other hand, "other small electrodes 6" means any small electrode 6 that exists in a row and column different from the one small electrode 6. To explain by giving a specific example, if the "one small electrode 6" is the small electrode 6A among the four small electrodes 6 illustrated in FIG. 2, the "other small electrodes 6" will be the small electrode 6B. This is because the small electrode 6B exists in a row and column different from the small electrode 6A. The small electrode 6E exists in a row different from the small electrode 6A, but in the same column, so it does not fall under the "other small electrodes 6". The small electrode 6F exists in a column different from the small electrode 6A, but in the same row, so it does not fall under the "other small electrodes 6".

[0042] Furthermore, the first fuse 71 connects the "side" of one small electrode 6 to the "side" or "vertex" of another small electrode 6. In this embodiment, the first fuse 71 connects the "side" of one small electrode 6 to the "side" of another small electrode 6. In this case, the "side" does not include the vertices at both ends. To explain by way of a specific example, as shown in FIG. 2, the first fuse 71 connects the side AB of the small electrode 6A to the side CD of the small electrode 6B. More specifically, the first fuse 71 has one end 71a and the other end 71b, and the one end 71a is located on the side AB of the small electrode 6A (excluding the vertices A and B), and the other end 71b is located on the side CD of the small electrode 6B (excluding the vertices C and D).

[0043] The first fuse 71 has a straight line shape connecting one end 71a and the other end 71b. In this embodiment, the multiple first fuses 71 included in the first electrode 31 are inclined at the same angle with respect to the second direction D2 in a plan view. That is, the multiple first fuses 71 are parallel to each other.

[0044] In this embodiment, the first fuse 71 does not connect two small electrodes 6 adjacent to each other in the first direction D1, and therefore the length of the first fuse 71 can be made longer than the slit width W1 (see FIG. 2).

[0045] The length of the first fuse 71 is preferably longer than the length of the sides of the small electrode 6. When the small electrode 6 has at least three sides which are longer than the other, the length of the first fuse 71 is preferably longer than the longest side. The length of the first fuse 71 can be adjusted by changing the position of one end 71a and / or the other end 71b.

[0046] Next, modifications of first fuse 71 will be described with reference to FIGS.

[0047] FIG. 3 shows a first modified example of the first fuse 71. In the first modified example, the first fuse 71 connects the "side" of one small electrode 6 and the "vertex" of another small electrode 6. In FIG. 3, the first fuse 71 connects the side AB of the small electrode 6A and the vertex C of the small electrode 6B. More specifically, one side end 71a of the first fuse 71 exists on the side AB of the small electrode 6A (excluding the vertices A and B), and the other side end 71b of the first fuse 71 exists on the vertex C of the small electrode 6B. The first fuse 71 of the first modified example also forms a straight line connecting the one side end 71a and the other side end 71b. In the first modified example, the length of the first fuse 71 can be made longer than the length of the side of the small electrode 6 by changing the position of the one side end 71a.

[0048] FIG. 4 shows a second modified example of the first fuse 71. The first fuse 71 of the second modified example differs from the first fuse 71 shown in FIG. 2 and FIG. 3 in that it is non-linear. That is, in the first fuse 71 of the second modified example, at least one bent portion 71c (two in FIG. 4) exists between one end portion 71a and the other end portion 71b. The bent portion 71c is a bent portion. In the second modified example, the length of the first fuse 71 can be made longer than the length of the side of the small electrode 6 by changing the position of the one end portion 71a and / or the other end portion 71b or by increasing the number of bent portions 71c. It goes without saying that, when the first fuse 71 is non-linear, the length of the first fuse 71 means the length along the shape of the first fuse 71, not the straight-line distance (shortest distance) between the one end portion 71a and the other end portion 71b.

[0049] FIG. 5 shows a third modified example of the first fuse 71. The first fuse 71 of the third modified example is common to the first fuse 71 of the second modified example in that it is non-linear, but the third modified example differs from the second modified example in the orientation of the sides of the two small electrodes 6 to which the first fuse 71 is connected. That is, in the second modified example, the side AB of the small electrode 6A where the one side end 71a exists and the side CD of the small electrode 6B where the other side end 71b exists are both parallel to the second direction D2. In contrast, in the third modified example, the side AB of the small electrode 6A where the one side end 71a exists is parallel to the second direction D2, but the side BC of the small electrode 6B where the other side end 71b exists is parallel to the first direction D1. In the third modified example, as in the second modified example, the length of the first fuse 71 can be made longer than the length of the sides of the small electrode 6 by changing the positions of the one side end 71a and / or the other side end 71b or increasing the number of bent portions 71c.

[0050] ≪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.

[0051] The second electrode 32 is disposed on the second surface 202 of the dielectric film 2 (the first dielectric film 21 in this embodiment). The second electrode 32 faces the first electrode 31 with the dielectric film 2 interposed therebetween.

[0052] Here, it can also be said that the second electrode 32 is disposed on the first surface 201 of the second dielectric film 22. Therefore, hereinafter, unless otherwise specified, this case will be described. As shown in FIG. 1, the second electrode 32 is disposed on the first surface 201 of the second dielectric film 22, except for the second margin portion 20b. The second margin portion 20b exists at the end on the other side (right side) in the first direction D1. The second margin portion 20b is a portion having a narrow strip shape. 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.

[0053] The second electrode 32 includes a second split electrode 42 , a second unsplit electrode 52 , and a first fuse 71 .

[0054] The second split electrode 42 occupies approximately half of the first surface 201 on the other side (right side) in the first direction D1. The second split electrode 42 is present between the second margin portion 20b and the second non-split electrode 52. The second split electrode 42 includes a plurality of small electrodes 6, similar to the first split electrode 41. In this manner, the second split electrode 42 is split into a plurality of small electrodes 6. In this embodiment, the small electrodes 6 included in the second split electrode 42 have the same shape and size as the small electrodes 6 included in the first split electrode 41, but are not particularly limited thereto.

[0055] The second divided electrode 42 faces the first undivided electrode 51 via the dielectric film 2. More specifically, the multiple small electrodes 6 face the first undivided electrode 51 via the dielectric film 2.

[0056] On the other hand, the second undivided electrode 52 occupies approximately half of one side (left side) in the first direction D1 on the first surface 201. The second undivided electrode 52 is solid and extends in the second direction D2. In this manner, the second undivided electrode 52 is not divided into a plurality of small electrodes 6.

[0057] The second undivided electrode 52 faces the first divided electrode 41 via the dielectric film 2. More specifically, the second undivided electrode 52 faces the multiple small electrodes 6 included in the first divided electrode 41 via the dielectric film 2.

[0058] Like the plurality of small electrodes 6 included in the first divided electrode 41, the plurality of small electrodes 6 included in the second divided electrode 42 are also arranged in a matrix shape consisting of a plurality of rows and a plurality of columns.

[0059] Similarly to the multiple small electrodes 6 included in the first divided electrode 41, each of the multiple small electrodes 6 included in the second divided electrode 42 also has a polygonal shape having at least three sides and vertices.

[0060] Similarly to the first fuse 71 included in the first electrode 31, the first fuse 71 included in the second electrode 32 also connects one small electrode 6 to another small electrode 6. The meanings of "one small electrode 6" and "another small electrode 6" are as described above.

[0061] Moreover, the first fuse 71 included in the second electrode 32 connects the second split electrode 42 and the second unsplit electrode 52 (see FIG. 1). Specifically, the first fuse 71 connects the small electrode 6 included in the second split electrode 42 and the second unsplit electrode 52. The small electrode 6 connected to the second unsplit electrode 52 is adjacent to the second unsplit electrode 52 in the first direction D1.

[0062] Similarly to the first fuse 71 included in the first electrode 31, the first fuse 71 included in the second electrode 32 also connects a "side" of one small electrode 6 to a "side" or "vertex" of another small electrode 6. In this embodiment, the first fuse 71 included in the second electrode 32 also connects a "side" of one small electrode 6 to a "side" of another small electrode 6.

[0063] Furthermore, similar to the first fuse 71 included in the first electrode 31, the length of the first fuse 71 included in the second electrode 32 is also preferably longer than the length of a side of the small electrode 6.

[0064] ≪End surface electrode≫ The material of the end electrode 300 is not particularly limited, but may include, for example, zinc (Zn), tin (Sn), and alloys 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.

[0065] The first end surface electrode 301 is connected to the first electrode 31 but is not connected to the second electrode 32. This is because a second margin portion 20b exists between the first end surface electrode 301 and the second electrode 32 (see FIG. 1). The first end surface electrode 301 is disposed on the other side (the right side) in the first direction D1. The first end surface electrode 301 is connected to the first non-divided electrode 51.

[0066] On the other hand, the second end surface electrode 302 is connected to the second electrode 32 but not to the first electrode 31. This is because a first margin portion 20a exists between the second end surface electrode 302 and the first electrode 31 (see FIG. 1). The second end surface electrode 302 is disposed on one side (the left side) in the first direction D1. The second end surface electrode 302 is connected to the second non-divided electrode 52.

[0067] <Metallized film> Next, metallized film 10 according to the first embodiment will be described with reference to Fig. 6. Fig. 6 particularly shows first metallized film 11. 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.

[0068] Metallized film 10 has an elongated film shape. That is, metallized film 10 is a film having a thickness in third direction D3, a width in first direction D1, and extending in second direction D2. Metallized film 10 includes dielectric film 2 and electrode 3.

[0069] Specifically, first metallized film 11 includes first dielectric film 21 and first electrode 31. First dielectric film 21 and first electrode 31 are as described above.

[0070] On the other hand, second metallized film 12 includes second dielectric film 22 and second electrode 32. Second dielectric film 22 and second electrode 32 are as described above.

[0071] <Action and effect> According to this embodiment, the sensitivity of the first fuse 71 can be increased for the following reasons.

[0072] In this embodiment, as shown in Fig. 2, the first fuse 71 connects small electrodes 6 that are present in different rows and columns. Therefore, one end 71a and the other end 71b of the first fuse 71 are misaligned when viewed along the first direction D1. If the one end 71a and the other end 71b were on the same straight line parallel to the first direction D1, the length of the fuse 70 linearly connecting the one end 71a and the other end 71b would be the same as the slit width W1 (see fuse 70 shown by imaginary lines in Fig. 2).

[0073] In contrast, in this embodiment, as described above, one end 71a and the other end 71b of first fuse 71 are not on the same straight line parallel to first direction D1, so that the length of first fuse 71 can be made longer than slit width W1. The same is true for the first modified example shown in FIG.

[0074] Furthermore, in the second and third modified examples, first fuse 71 has two or more bent portions 71c between one end 71a and the other end 71b. This allows first fuse 71 to be longer than if one end 71a and the other end 71b were connected in a straight line. This allows first fuse 71 to have a higher electrical resistance.

[0075] Therefore, according to this embodiment and the first to third modifications, the sensitivity of the first fuse 71 can be increased.

[0076] In this way, the sensitivity of the first fuse 71 is increased by increasing the length of the first fuse 71, so that even if the thicknesses of the first electrode 31 and the second electrode 32 are increased, there is little effect on the sensitivity of the first fuse 71. 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 high sensitivity of the first fuse 71 while reducing heat generation during operation of the film capacitor 1.

[0077] (2) Second embodiment <Film capacitor> Next, a film capacitor 1 according to a second embodiment will be described with reference to Figs. 8 to 13. In the second embodiment, components similar to those in the first embodiment are given the same reference numerals as 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.

[0078] 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 72.

[0079] ≪First electrode≫ In this embodiment, the first electrode 31 further includes a second fuse 72. Like the first fuse 71, the second fuse 72 is also a part that melts when an excessive current flows, thereby breaking the circuit.

[0080] The second fuse 72 connects one small electrode 6 to another small electrode 6. When an excessive current flows between the one small electrode 6 and another small electrode 6, the second fuse 72 melts and cuts off the electrical connection between the one small electrode 6 and another small electrode 6. Needless to say, the width of the second fuse 72, like the width of the first fuse 71, is shorter than the length of each side of the polygon formed by the small electrodes 6. The width of the second fuse 72 may be the same as or different from the width of the first fuse 71.

[0081] Here, the meanings of the above-mentioned "one small electrode 6" and "other small electrodes 6" will be explained. As described above, "one small electrode 6" means any small electrode 6 among the multiple small electrodes 6. On the other hand, "other small electrodes 6" have a different meaning from "other small electrodes 6" connected to the first fuse 71. That is, "other small electrodes 6" here means any small electrode 6 that exists in a different row and the same column as the one small electrode 6. To explain by giving a specific example, if the "one small electrode 6" is the small electrode 6A among the four small electrodes 6 illustrated in FIG. 9, the "other small electrodes 6" will be the small electrode 6E. This is because the small electrode 6E exists in a different row and the same column as the small electrode 6A. Note that the small electrode 6B exists in a different row from the small electrode 6A, but in a different column, so it does not fall under the "other small electrodes 6". Furthermore, the small electrode 6F exists in the same row and in a different column as the small electrode 6A, so it does not fall under the "other small electrodes 6".

[0082] In this embodiment, the second fuse 72 is linear and extends in the second direction D2. Specifically, the second fuse 72 has one end 72a and the other end 72b, which are on the same straight line parallel to the second direction D2. Therefore, the length of the second fuse 72 is equal to the distance (slit width W2) between the small electrode 6A and the small electrode 6E (see FIG. 9).

[0083] Next, modified examples of second fuse 72 will be described with reference to FIGS.

[0084] Fig. 10 shows a first modified example of the second fuse 72. The second fuse 72 of the first modified example differs from the second fuse 72 shown in Fig. 9 in that one end 72a and the other end 72b are not on the same straight line parallel to the second direction D2. Specifically, in the first modified example, the one end 72a is on the apex A of the small electrode 6A, and the other end 72b is on the apex C of the small electrode 6E. This makes the length of the second fuse 72 longer than the shortest distance (slit width W2) between one small electrode 6 and the other small electrode 6.

[0085] Furthermore, in the second fuse 72 of the first modification, at least one (eight in FIG. 10) bent portion 72c exists between one end 72a and the other end 72b. The bent portion 72c is a bent portion. In the first modification, the length of the second fuse 72 can be made longer than the length of the side of the small electrode 6 by changing the position of the one end 72a and / or the other end 72b or by increasing the number of bent portions 72c. Needless to say, when the second fuse 72 is non-linear, the length of the second fuse 72 does not mean the linear distance (shortest distance) between the one end 72a and the other end 72b, but the length along the shape of the second fuse 72.

[0086] 11 shows a second modified example of the second fuse 72. In the second modified example, as in the first modified example, one end 72a and the other end 72b of the second fuse 72 are not on the same straight line parallel to the second direction D2, so that the length of the second fuse 72 is longer than the shortest distance (slit width W2) between one small electrode 6 and the other small electrode 6.

[0087] Furthermore, second fuse 72 of the second modification is common to second fuse 72 of the first modification in that it is non-linear. However, the second modification differs from the first modification in that bent portion 72c of the first modification is smoothly bent, whereas bent portion 72c of the second modification is angularly bent.

[0088] In this way, the second fuse 72 of the second modification also has at least one bent portion 72c (six in FIG. 11) between the one end 72a and the other end 72b. In the second modification, the length of the second fuse 72 can be made longer than the length of the side of the small electrode 6 by changing the position of the one end 72a and / or the other end 72b or by increasing the number of bent portions 72c.

[0089] 12 shows a third modified example of the second fuse 72. In the third modified example, similarly to the first modified example, one end 72a and the other end 72b of the second fuse 72 are not on the same straight line parallel to the second direction D2, so that the length of the second fuse 72 is longer than the shortest distance (slit width W2) between one small electrode 6 and the other small electrode 6.

[0090] Furthermore, the second fuse 72 of the third modification differs from the second fuse 72 of the second modification in the number of bent portions 72c. That is, the second fuse 72 of the third modification has two bent portions 72c. In the third modification as well, the length of the second fuse 72 can be made longer than the length of the sides of the small electrode 6 by changing the positions of the one side end 72a and / or the other side end 72b or by increasing the number of bent portions 72c.

[0091] ≪Second electrode≫ In this embodiment, the second electrode 32 further includes a second fuse 72, similar to the first electrode 31. Specifically, the second fuse 72 connects two small electrodes 6 adjacent to each other in the second direction D2. In this manner, the configuration of the second fuse 72 included in the second electrode 32 is similar to the configuration of the second fuse 72 included in the first electrode 31.

[0092] <Metallized film> Next, metallized film 10 according to a second embodiment will be described with reference to Fig. 13. Fig. 13 particularly shows 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 72. The other points are similar.

[0093] <Action and effect> In the present embodiment, similarly to the first embodiment, it is possible to increase the sensitivity of the first fuse 71. Furthermore, in the present embodiment, due to the same action as the first fuse 71, it is possible to increase the sensitivity of the second fuse 72 as well.

[0094] Furthermore, according to this embodiment, it is possible to suppress an excessive decrease in the capacitance of the film capacitor 1 upon dielectric breakdown for the following reasons.

[0095] For example, consider a case where dielectric breakdown occurs in the portion of one small electrode 6A surrounded by the dashed line X1 in Fig. 1. In this case, the first fuse 71 connecting the small electrodes 6A and 6B may be cut. As a result, the three small electrodes 6 surrounded by the dashed line Y1 (the small electrodes 6B, 6C, and 6D connected by the first fuse 71) are isolated. As a result, there is a risk that the capacitance corresponding to these three small electrodes 6 will decrease.

[0096] In contrast, in this embodiment, as shown in Fig. 8, the second fuse 72 exists for each small electrode 6. Therefore, even if a dielectric breakdown occurs in a portion of one small electrode 6A surrounded by the dashed line X2 and the first fuse 71 connecting the small electrode 6A and the small electrode 6B is cut, the isolation of the three small electrodes 91 (the small electrodes 6B, 6C, and 6D connected by the first fuse 71) surrounded by the dashed line Y2 is suppressed. This is because each of these three small electrodes 6 is connected to the small electrode 6 adjacent in the second direction D2 by the second fuse 72. As a result, the capacitance is only reduced by an amount equivalent to one small electrode 6A surrounded by the dashed line X2.

[0097] Therefore, according to this embodiment, it is possible to prevent an excessive decrease in the capacitance of the film capacitor 1 when a dielectric breakdown occurs.

[0098] Moreover, by employing second fuse 72 of the first to third modified examples shown in FIGS. 10 to 12, the length of second fuse 72 can be increased, and therefore the sensitivity of second fuse 72 can be increased.

[0099] 3. Variations In the first and second embodiments, four small electrodes 6 are arranged in the first direction D1 (row direction), but the number of small electrodes 6 arranged in the first direction D1 is not particularly limited as long as it is plural.

[0100] In the first and second embodiments, the small electrodes 6 are rectangular in plan view, but are not particularly limited as long as they are polygonal.

[0101] In the first and second embodiments, the four sides of the rectangle formed by the small electrodes 6 are parallel to the first direction D1 or the second direction D2, but at least three sides of the polygon formed by the small electrodes 6 do not have to be parallel to the first direction D1 and the second direction D2.

[0102] In the first fuse 71 of the second and third modified examples, the bent portion 71c is bent at an angle, but the bent portion 71c may be bent smoothly.

[0103] 4. Aspects 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.

[0104] The first aspect is a film capacitor (1) including a dielectric film (2) having a first surface (201) and a second surface (202) opposite to the first surface (201), a first electrode (31) arranged on the first surface (201), and a second electrode (32) arranged on the second surface (202) facing the first electrode (31) via the dielectric film (2). The first electrode (31) includes a plurality of small electrodes (6) arranged in a matrix shape consisting of a plurality of rows and a plurality of columns, and a first fuse (71) connecting one small electrode (6) of the plurality of small electrodes (6) and another small electrode (6) present in a row and column different from the one small electrode (6). Each of the plurality of small electrodes (6) has a polygonal shape having at least three sides and vertices. The first fuse (71) connects a side of the one small electrode (6) to a side or a vertex of the other small electrode (6).

[0105] According to this embodiment, the sensitivity of the first fuse (71) can be increased.

[0106] The second aspect is a film capacitor (1) based on the first aspect. In the second aspect, the length of the first fuse (71) is longer than the length of the side of the small electrode (6).

[0107] According to this embodiment, the sensitivity of the first fuse (71) can be further increased.

[0108] A third aspect is a film capacitor (1) based on the first or second aspect. In the third aspect, the first electrode (31) further includes a second fuse (72) that connects the one small electrode (6) and another small electrode (6) that is in a different row and the same column as the one small electrode (6).

[0109] According to this embodiment, it is possible to suppress an excessive decrease in the capacitance of the film capacitor (1) upon dielectric breakdown.

[0110] The fourth aspect is a film capacitor (1) based on the third aspect. In the fourth aspect, the length of the second fuse (72) is longer than the shortest distance between the one small electrode (6) and the other small electrode (6).

[0111] According to this embodiment, the sensitivity of the second fuse (72) can be increased.

[0112] A fifth aspect is a film capacitor (1) based on any one of the first to fourth aspects. In the fifth aspect, the second electrode (32) includes a plurality of small electrodes (6) arranged in a matrix shape consisting of a plurality of rows and a plurality of columns, and a first fuse (71) that connects one small electrode (6) of the plurality of small electrodes (6) to another small electrode (6) that exists in a row and column different from the one small electrode (6). Each of the plurality of small electrodes (6) forms a polygonal shape having at least three sides and vertices. The first fuse (71) connects a side of the one small electrode (6) to a side or a vertex of the other small electrode (6).

[0113] According to this embodiment, the sensitivity of the first fuse (71) at the first electrode (31) and the second electrode (32) can be increased.

[0114] A sixth aspect is a film capacitor (1) based on the fifth aspect. In the sixth aspect, the length of the first fuse (71) is longer than the length of a side of the small electrode (6).

[0115] According to this embodiment, the sensitivity of the first fuse (71) at the second electrode (32) can be further increased.

[0116] A seventh aspect is a film capacitor (1) based on the fifth or sixth aspect. In the seventh aspect, the second electrode (32) further includes a second fuse (72) that connects the one small electrode (6) and another small electrode (6) that is in a different row and the same column as the one small electrode (6).

[0117] According to this embodiment, it is possible to suppress an excessive decrease in the capacitance of the film capacitor (1) upon dielectric breakdown.

[0118] The eighth aspect is a film capacitor (1) based on the seventh aspect. In the eighth aspect, the length of the second fuse (72) is longer than the shortest distance between the one small electrode (6) and the other small electrode (6).

[0119] According to this embodiment, the sensitivity of the second fuse (72) at the second electrode (32) can be increased.

[0120] A ninth aspect is a metallized film (10) comprising a dielectric film (2) and an electrode (3) arranged on the dielectric film (2). The electrode (3) includes a plurality of small electrodes (6) arranged in a matrix of a plurality of rows and a plurality of columns, and a first fuse (71) connecting one small electrode (6) of the plurality of small electrodes (6) to another small electrode (6) present in a different row and column from the one small electrode (6). Each of the plurality of small electrodes (6) forms a polygonal shape having at least three sides and vertices. The first fuse (71) connects a side of the one small electrode (6) to a side or vertex of the other small electrode (6).

[0121] According to this embodiment, the sensitivity of the first fuse (71) can be increased.

[0122] A tenth aspect is the metallized film (10) according to the ninth aspect. In the tenth aspect, the length of the first fuse (71) is longer than the length of the side of the small electrode (6).

[0123] According to this embodiment, the sensitivity of the first fuse (71) can be further increased.

[0124] An eleventh embodiment is a metallized film (10) based on the ninth or tenth embodiment. In the eleventh embodiment, the electrode (3) further includes a second fuse (72) connecting the one small electrode (6) and another small electrode (6) that is in a different row and the same column as the one small electrode (6).

[0125] According to this embodiment, it is possible to suppress an excessive decrease in the capacitance of the film capacitor (1) upon dielectric breakdown.

[0126] A twelfth aspect is a metallized film (10) based on the eleventh aspect. In the twelfth aspect, the length of the second fuse (72) is longer than the shortest distance between the one small electrode (6) and the other small electrode (6).

[0127] According to this embodiment, the sensitivity of the second fuse (72) can be increased. [Explanation of symbols]

[0128] 1. Film capacitor 10 Metallized Film 2. Dielectric film 201 Page 1 202 2nd page 3 electrodes 31 1st electrode 32 2nd electrode 6 small electrodes 71 First Fuse 72 Second Fuse

Claims

1. 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 small electrodes arranged in a matrix of a plurality of rows and a plurality of columns, and a first fuse connecting one small electrode of the plurality of small electrodes to another small electrode that is in a different row and column from the one small electrode; Each of the plurality of small electrodes is in the shape of a polygon having at least three sides and three vertices; The first fuse connects a side of the one small electrode and a side or a vertex of the other small electrode. Film capacitor.

2. The length of the first fuse is longer than the length of a side of the small electrode. The film capacitor according to claim 1 .

3. The first electrode further includes a second fuse connecting the one small electrode and another small electrode that is in a different row and the same column as the one small electrode. The film capacitor according to claim 1 .

4. The length of the second fuse is longer than the shortest distance between the one small electrode and the other small electrode. The film capacitor according to claim 3 .

5. the second electrode includes a plurality of small electrodes arranged in a matrix of a plurality of rows and a plurality of columns, and a first fuse connecting one small electrode of the plurality of small electrodes to another small electrode that is in a different row and column from the one small electrode; Each of the plurality of small electrodes is in the shape of a polygon having at least three sides and three vertices; The first fuse connects a side of the one small electrode and a side or a vertex of the other small electrode. The film capacitor according to claim 1 .

6. The length of the first fuse is longer than the length of a side of the small electrode. The film capacitor according to claim 5 .

7. The second electrode further includes a second fuse connecting the one small electrode and another small electrode that is in a different row and the same column as the one small electrode. The film capacitor according to claim 5 .

8. The length of the second fuse is longer than the shortest distance between the one small electrode and the other small electrode. The film capacitor according to claim 7.

9. A dielectric film and an electrode disposed on the dielectric film, The electrodes include a plurality of small electrodes arranged in a matrix of a plurality of rows and a plurality of columns, and a first fuse connecting one small electrode of the plurality of small electrodes to another small electrode that is in a different row and column from the one small electrode; Each of the plurality of small electrodes is in the shape of a polygon having at least three sides and three vertices; The first fuse connects a side of the one small electrode and a side or a vertex of the other small electrode. Metallized film.

10. The length of the first fuse is longer than the length of a side of the small electrode.

10. The metallized film of claim 9.

11. The electrodes further include a second fuse connecting the one small electrode and another small electrode that is in a different row and the same column as the one small electrode.

10. The metallized film of claim 9.

12. The length of the second fuse is longer than the shortest distance between the one small electrode and the other small electrode.

12. The metallized film of claim 11.

Images