capacitor

Abstract

To provide a capacitor that may ensure a long creepage distance between a first bus bar and a second bus bar while suppressing the amount of extension of an insulating member toward the non-overlapping portion of the first bus bar.SOLUTION: A first bus bar 500 includes a non-overlapping portion 512 that is continuous with a first overlapping portion 511 and does not overlap with a second overlapping portion 611 of a second bus bar 600, and a connection terminal portion 520 that protrudes from the non-overlapping portion 512 and is connected to the external terminal 2a. An insulating member 700 includes a first portion 711 that is interposed between the first overlapping portion 511 and the second overlapping portion 611, a second portion 712 that is continuous with the first portion 711 and overlaps the non-overlapping portion 512, and a first rib 717 that protrudes from the second portion 712 to the side opposite the non-overlapping portion 512. The first rib 717 extends in a left-right direction perpendicular to the up-down direction in which the non-overlapping portion 512 and the second overlapping portion 611 are aligned.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a capacitor. [Background technology]

[0002] Patent Document 1 describes a film capacitor in which metallikon electrodes are formed on both end surfaces of a capacitor element, bus bars are connected to each of the metallikon electrodes, and portions of the pair of bus bars are overlapped with a holding member made of insulating resin sandwiched between them, thereby reducing mutual inductance (equivalent series inductance).

[0003] In the film capacitor of Patent Document 1, the first portions of a pair of bus bars overlap with each other, sandwiching a flat portion of a holding member. An external connection terminal is formed at one end of each first portion. The ends of the two first portions are connected via one end of the flat portion, and a creepage distance equal to the thickness of the flat portion is secured between the two first portions. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2016 / 027462 Summary of the Invention [Problem to be solved by the invention]

[0005] In the above-described film capacitor, the two first portions have ends where the external connection terminals are formed at the same position. Alternatively, the pair of bus bars may be configured such that one first portion extends outward from the other first portion at the end where the external connection terminals are formed, so that the ends of the two first portions are not at the same position. In this case, the outwardly extending portion becomes a non-overlapping portion that does not overlap with the other first portion.

[0006] In this configuration, if the flat portion extends from one end of the other first portion toward the non-overlapping portion, the creepage distance between the two first portions is the sum of the thickness of the flat portion and the length of the extension, which makes it easier to ensure the necessary creepage distance between the two first portions even if the voltage applied to the film capacitor increases.

[0007] However, if the flat portion extends too far toward the non-overlapping portion, there is a concern that when the film capacitor is installed in an external device, parts related to the external device, such as external terminals connected to the external connection terminal portion, may be more likely to interfere with the portion extending toward the non-overlapping portion.

[0008] Therefore, an object of the present invention is to provide a capacitor that can ensure a long creepage distance between the first bus bar and the second bus bar while suppressing the amount of extension of the insulating material toward the non-overlapping portion of the first bus bar. [Means for solving the problem]

[0009] A capacitor according to a main aspect of the present invention includes a capacitor element, a first bus bar and a second bus bar connected to the capacitor element, and an insulating member disposed between the first bus bar and the second bus bar. The first bus bar includes a first overlapping portion, and the second bus bar includes a second overlapping portion, with the first overlapping portion and the second overlapping portion overlapping each other. The insulating member is disposed between the first overlapping portion and the second overlapping portion. The first bus bar includes a non-overlapping portion that is continuous with the first overlapping portion and does not overlap with the second overlapping portion, and a connection terminal portion that protrudes from the non-overlapping portion and is connected to an external terminal. The insulating member includes a first portion that is interposed between the first overlapping portion and the second overlapping portion, a second portion that is continuous with the first portion and overlaps the non-overlapping portion, and a protruding portion that protrudes from the second portion to the side opposite the non-overlapping portion. The protruding portion extends in a second direction perpendicular to a first direction in which the first overlapping portion and the non-overlapping portion are aligned. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a capacitor that can ensure a long creepage distance between the first bus bar and the second bus bar while suppressing the amount of extension of the insulating member toward the non-overlapping portion of the first bus bar.

[0011] The effects and significance of the present invention will become more apparent from the following description of the embodiments, however, the embodiments shown below are merely examples of how the present invention can be put into practice, and the present invention is not limited to the embodiments described below. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a perspective view of a film capacitor according to an embodiment. [Figure 2] FIG. 2(a) is a perspective view of the capacitor element unit according to the embodiment as seen from above the front, and FIG. 2(b) is a perspective view of the capacitor element unit according to the embodiment as seen from above the rear. [Figure 3] FIG. 3(a) is a perspective view of a first bus bar according to the embodiment, and FIG. 3(b) is a perspective view of a second bus bar according to the embodiment. [Figure 4] FIG. 4(a) is a perspective view of an insulating member according to the embodiment as seen from above the front, and FIG. 4(b) is a perspective view of an insulating member according to the embodiment as seen from above the rear. [Figure 5] FIG. 5 is a front view of a main part of a capacitor element unit according to an embodiment. [Figure 6] FIG. 6(a) is a rear view of a main part of the capacitor element unit according to the embodiment, and FIG. 6(b) is a cross-sectional view taken along line AA' of FIG. 6(a). [Figure 7] FIG. 7 is a cross-sectional view of a mold used for injection molding of an insulating member according to an embodiment. [Figure 8] 8(a) and 8(b) are plan views of the first member and the second member constituting the mold according to the embodiment, respectively, as viewed from their parting surfaces. [Figure 9]Fig. 9(a) is a rear view of an insulating member according to a modified example, and Figs. 9(b) and 9(c) are side cross-sectional views of the insulating member according to the modified example. DETAILED DESCRIPTION OF THE INVENTION

[0013] A film capacitor 1, which is one embodiment of a capacitor of the present invention, will be described below with reference to the drawings. For convenience, the front-rear, left-right, and up-down directions are indicated in each drawing as appropriate. Note that the directions shown in the drawings indicate only relative directions of the film capacitor 1, and do not indicate absolute directions. For convenience of explanation, some components may be given names that correspond to the directions shown in the drawings, such as "front" and "rear."

[0014] In this embodiment, film capacitor 1 corresponds to the "capacitor" in the claims. Also, first rib 717 corresponds to the "protrusion" in the claims. Furthermore, second rib 718 corresponds to the "connection" in the claims. Furthermore, the up-down direction corresponds to the "first direction" in the claims, and the left-right direction corresponds to the "second direction" in the claims.

[0015] However, the above description is intended solely to match the configuration of the claims with the configuration of the embodiments, and the above correspondence does not in any way limit the invention described in the claims to the configuration of the embodiments.

[0016] <Film capacitor structure> FIG. 1 is a perspective view of a film capacitor 1. FIG.

[0017] The film capacitor 1 includes a capacitor element unit 100, a case 200 that houses the capacitor element unit 100, and a filled resin 300 that fills the case 200. The portion of the capacitor element unit 100 that is buried in the filled resin 300, particularly the capacitor element 400, is protected from moisture and impact by the case 200 and the filled resin 300.

[0018] FIG. 2(a) is a perspective view of the capacitor element unit 100 seen from above the front, and FIG. 2(b) is a perspective view of the capacitor element unit 100 seen from above the rear.

[0019] The capacitor element unit 100 includes a capacitor element 400 , a first bus bar 500 , a second bus bar 600 , and an insulating member 700 .

[0020] Capacitor element 400 is formed by stacking two metallized films, each made by depositing aluminum on a dielectric film, rolling or laminating the stacked metallized films, and pressing them flat. Capacitor element 400 has first electrode 410 formed on one end face by spraying a metal such as zinc, and second electrode 420 formed on the other end face by spraying a metal such as zinc.

[0021] Although capacitor element 400 of the present embodiment is formed from a metallized film in which aluminum is vapor-deposited on a dielectric film, it may also be formed from a metallized film in which other metals such as zinc, magnesium, etc. Alternatively, capacitor element 400 may be formed from a metallized film in which multiple metals selected from these metals are vapor-deposited, or from a metallized film in which an alloy of these metals is vapor-deposited.

[0022] FIG. 3( a ) is a perspective view of the first bus bar 500 .

[0023] First bus bar 500 is formed by appropriately cutting and bending a metal plate, such as a copper plate, which is a conductive material having a predetermined shape.

[0024] The first bus bar 500 includes a main body portion 510 having a rectangular flat plate shape. The main body portion 510 is divided in the up-down direction into a portion that becomes a first overlapping portion 511 and a portion that becomes a non-overlapping portion 512 that is continuous with the first overlapping portion 511. The non-overlapping portion 512 is located above the first overlapping portion 511. For convenience, the boundary between the first overlapping portion 511 and the non-overlapping portion 512 is indicated by a two-dot chain line in FIG. 3(a).

[0025] At the top of main body 510 included in non-overlapping portion 512, a portion of main body 510 is cut and raised to form four rectangular connection terminal portions 520 lined up in the left-right direction. A rectangular opening 513 larger than connection terminal portion 520 is formed in the portion of main body 510 where each connection terminal portion 520 is cut and raised. Each opening 513 is adjacent to the corresponding connection terminal portion 520 and lined up in the left-right direction.

[0026] Four rectangular openings 514 are formed in the middle of the main body 510 included in the first overlapping portion 511 at the same positions in the left-right direction as the four openings 513. The four openings 514 have the same size as the four openings 513. Furthermore, rectangular through-holes 515 that are long in the vertical direction are formed at the left and right ends of the middle of the main body 510.

[0027] A circular opening 516 is formed in the center of the lower part of the main body 510 included in the first overlapping part 511.

[0028] Furthermore, first bus bar 500 includes electrode terminal portion 530 that is bent from the lower end of main body portion 510 at a right angle to main body portion 510. Electrode terminal portion 530 has a rectangular plate shape that is elongated in the left-right direction.

[0029] Furthermore, first bus bar 500 includes bent portions 540 that are bent at right angles to main body portion 510 from each of the left and right ends of first overlapping portion 511 and non-overlapping portion 512. Each bent portion 540 has a rectangular plate shape that is elongated in the vertical direction. Each bent portion 540 contacts each of through holes 515.

[0030] FIG. 3( b ) is a perspective view of the second bus bar 600 .

[0031] Second bus bar 600 is formed by appropriately cutting and bending a metal plate, such as a copper plate, which is a conductive material having a predetermined shape.

[0032] The second bus bar 600 includes a main body portion 610 having a rectangular flat plate shape. The main body portion 610 is divided in the up-down direction into a portion that becomes a second overlapping portion 611 and a portion that becomes a non-overlapping portion 612 that is continuous with the second overlapping portion 611. The non-overlapping portion 612 is located below the second overlapping portion 611. For convenience, the boundary between the second overlapping portion 611 and the non-overlapping portion 612 is indicated by a two-dot chain line in FIG. 3(b).

[0033] At the top of the main body 610 included in the second overlapping portion 611, a portion of the main body 610 is cut and raised, thereby forming four rectangular connection terminal portions 620 lined up in the left-right direction. In the portion of the main body 610 where each connection terminal portion 620 is cut and raised, a rectangular opening portion 613 larger than the connection terminal portion 620 is formed. Each opening portion 613 is adjacent to the corresponding connection terminal portion 620 and lined up in the left-right direction. The four opening portions 613 have the same size as the four opening portions 514 of the first bus bar 500.

[0034] A circular opening 614 is formed in the center of the middle portion of the main body portion 610 included in the second overlapping portion 611.

[0035] Furthermore, second bus bar 600 includes electrode terminal portion 630 that is bent from the lower end of main body portion 610 at a right angle to main body portion 610. Electrode terminal portion 630 has a rectangular plate shape that is elongated in the left-right direction.

[0036] FIG. 4(a) is a perspective view of the insulating member 700 as seen from above the front, and FIG. 4(b) is a perspective view of the insulating member 700 as seen from above the rear.

[0037] The insulating member 700 is made of a resin such as polyphenylene sulfide (PPS) and is formed by injection molding, which will be described later.

[0038] The insulating member 700 includes a main body 710 having a substantially rectangular plate shape that is long in the left-right direction. The main body 710 is divided in the up-down direction into a first portion 711, a second portion 712 that is continuous with the first portion 711, and a third portion 713 that is continuous with the first portion 711. The second portion 712 is located above the first portion 711, and the third portion 713 is located below the first portion 711. For convenience, the boundaries between the first portion 711 and the second portion 712 and the boundaries between the first portion 711 and the third portion 713 are indicated by two-dot chain lines in Figures 4(a) and (b).

[0039] A substantially cylindrical protruding portion 714 is formed in the center of the first portion 711 of the main body 710, with a portion of the front surface 710a of the main body 710 protruding and a portion of the rear surface 710b of the main body 710 being recessed. The protruding portion 714 has a recess 714a on its back side. A substantially cylindrical gate mark 715 is formed on the surface of the rear surface 710b of the main body 710 recessed by the protruding portion 714, i.e., on the bottom surface of the recess 714a. The gate mark 715 is formed by injection molding. The outer diameter of the protruding portion 714 is smaller than the inner diameters of the openings 516 of the first bus bar 500 and the openings 614 of the second bus bar 600.

[0040] Furthermore, four rectangular openings 716 are formed in the upper portion of first portion 711, aligned in the left-right direction. The four openings 716 have the same size as the four openings 514 of first bus bar 500.

[0041] Two first ribs 717 are formed on the rear surface 710b of the second portion 712 of the main body 710, protruding rearward and extending in the left-right direction from the left end to the right end. The two first ribs 717 are aligned vertically with a predetermined distance between them. The predetermined distance is set to a distance equal to or greater than the distance (1 mm) at which the two first ribs 717 are considered to be apart according to regulations related to creepage distance.

[0042] The two first ribs 717 are connected at their left and right ends by second ribs 718. The height of each second rib 718 is the same as the height of each first rib 717.

[0043] Furthermore, the insulating member 700 includes a clamping portion 720 at each of the left and right ends of the front surface 710a of the main body 710. The clamping portion 720 is composed of a first contact portion 721 located on the outer side of the insulating member 700 and a second contact portion 722 located on the inner side. The first contact portion 721 has a rectangular plate shape that is elongated in the vertical direction. The second contact portion 722 has a rectangular parallelepiped shape that is elongated in the vertical direction. The vertical dimension of the first contact portion 721 is larger than the vertical dimension of the second contact portion 722, and the horizontal dimension of the first contact portion 721 is smaller than the horizontal dimension of the second contact portion 722. The first contact portion 721 and the second contact portion 722 have the same front-to-rear dimension. The front-to-rear dimension of the bent portion 540 of the first bus bar 500 is larger than the front-to-rear dimensions of the first contact portion 721 and the second contact portion 722.

[0044] The first contact portion 721 includes two first ribs 721a. The two first ribs 721a are formed on the side surface of the first contact portion 721 facing the second contact portion 722, at positions above and below the second contact portion 722, and extend in the front-rear direction. The second contact portion 722 includes one second rib 722a. The second rib 722a is formed on the side surface of the second contact portion 722 facing the first contact portion 721, between the two first ribs 721a, and extends in the front-rear direction. The gap between the first rib 721a and the second rib 722a is set slightly smaller than the thickness (dimension in the left-right direction) of the bent portion 540 of the first bus bar 500.

[0045] 2(a) and 2(b), the first bus bar 500 is attached to the front side of the insulating member 700. The main body 510 of the first bus bar 500 contacts the front surface 710a of the main body 710 of the insulating member 700. The protruding portions 714 of the insulating member 700 pass through the openings 516 of the first bus bar 500. The bent portions 540 on both the left and right sides of the first bus bar 500 are clamped by the clamping portions 720 of the insulating member 700. The four openings 514 of the first bus bar 500 overlap the four openings 716 of the insulating member 700.

[0046] The second bus bar 600 is attached to the rear side of the insulating member 700. The main body 610 of the second bus bar 600 contacts the rear surface 710b of the main body 710 of the insulating member 700. The recess 714a of the insulating member 700 overlaps the opening 614 of the second bus bar 600, and the gate mark 715 overlaps the opening 614. There may be some variation in the height of the gate mark 715. If the gate mark 715 becomes higher and protrudes rearward from the recess 714a, the tip of the protruding gate mark 715 is inserted into the opening 614 and does not interfere with the main body 610 of the second bus bar 600.

[0047] The four openings 613 of the second bus bar 600 overlap with the four openings 716 of the insulating member 700, and each connection terminal portion 620 of the second bus bar 600 passes through each of the three overlapping openings 514, 716, 613 and protrudes forward of the first bus bar 500. The terminal row of the four connection terminal portions 620 is located below the four connection terminal portions 520. The positions of the front ends of the four connection terminal portions 520 and the positions of the front ends of the four connection terminal portions 620 are aligned.

[0048] The first overlapping portion 511 of the first bus bar 500 and the second overlapping portion 611 of the second bus bar 600 overlap in the front-to-rear direction. The non-overlapping portion 512 of the first bus bar 500 does not overlap with the second overlapping portion 611, and the non-overlapping portion 612 of the second bus bar 600 does not overlap with the first overlapping portion 511. A first portion 711 of the insulating member 700 is interposed between the first overlapping portion 511 and the second overlapping portion 611. A second portion 712 of the insulating member 700 overlaps with the non-overlapping portion 512 of the first bus bar 500. A third portion 713 of the insulating member 700 is interposed between the non-overlapping portion 612 of the second bus bar 600 and the circumferential surface of the capacitor element 400.

[0049] The capacitor element 400 is disposed between the electrode terminal portion 530 of the first bus bar 500 and the electrode terminal portion 630 of the second bus bar 600. The electrode terminal portion 530 is joined to the first electrode 410 of the capacitor element 400 by a joining method such as soldering. This electrically connects the first bus bar 500 to the first electrode 410. Similarly, the electrode terminal portion 630 is joined to the second electrode 420 of the capacitor element 400 by a joining method such as soldering. This electrically connects the second bus bar 600 to the second electrode 420. Note that pin-shaped terminals may be formed on the electrode terminal portions 530, 630, and these terminals may be joined to the electrodes 410, 420 by soldering or the like.

[0050] FIG. 5 is a front view of the main part of the capacitor element unit 100. As shown in FIG.

[0051] 5 , in each clamping portion 720 of the insulating member 700, a first rib 721a of the first contact portion 721 contacts the bent portion 540 from the outside of the first bus bar 500, and a second rib 722a of the second contact portion 722 that passes through the through hole 515 of the first bus bar 500 contacts the bent portion 540 from the inside of the first bus bar 500. The first rib 721a and the second rib 722a are so-called crush ribs, and when the bent portion 540 is inserted between the first contact portion 721 and the second contact portion 722, the tip portions of the crush ribs are scraped or deformed by the bent portion 540. The first contact portion 721 and the second contact portion 722 contact the bent portion 540 from both sides, and thus a force that holds the first bus bar 500 in the front-rear direction (a force that suppresses movement) is generated in the insulating member 700.

[0052] First bus bar 500 is positioned relative to insulating member 700 in the front-rear and left-right directions by a positioning structure formed by bent portion 540 and clamping portion 720 .

[0053] The vertical dimension of through hole 515 is larger than the vertical dimension of second contact portion 722, and relatively large gaps are generated above and below between second contact portion 722 and through hole 515. Therefore, in this embodiment, another positioning structure (not shown) is provided between first bus bar 500 and insulating member 700, and this positioning structure positions first bus bar 500 in the vertical direction relative to insulating member 700. Furthermore, another positioning structure (not shown) is provided between second bus bar 600 and insulating member 700, and this positioning structure positions second bus bar 600 in the vertical, front-rear, and left-right directions relative to insulating member 700.

[0054] FIG. 6(a) is a rear view of the main part of the capacitor element unit 100, and FIG. 6(b) is a cross-sectional view taken along line AA' of FIG. 6(a).

[0055] 6(a) and 6(b), the four connection terminal portions 520 of the first bus bar 500 protrude from the non-overlapping portion 512 to the side opposite (the front side of) the second portion 712 of the insulating member 700. The upper ends of the second portions 712 are at the same height as the lower ends of the four openings 513 of the first bus bar 500, and the second portions 712 do not overlap with the four openings 513 or the four connection terminal portions 520 in the front-to-rear direction. Note that the second portions 712 may overlap the lower ends of the four openings 513, if only slightly.

[0056] In the second portion 712 of the insulating member 700, the two first ribs 717 protrude to the side opposite (rear side of) the non-overlapping portion 512 of the first bus bar 500, and have a dimension that is slightly longer in the left-right direction than the overlapping range R so that they are present in the overlapping range R where the range of the non-overlapping portion 512 and the range of the second overlapping portion 611 of the second bus bar 600 overlap when viewed from the top-bottom direction. In addition, the two second ribs 718 connect the two first ribs 717 outside the overlapping range R in the left-right direction.

[0057] As shown by the thick line in Figure 6(b), a creepage distance D is ensured in the up-down direction between the non-overlapping portion 512 of the first bus bar 500 and the second overlapping portion 611 of the second bus bar 600 by the second portion 712 of the insulating member 700 and the two first ribs 717. The rear surface side of the second portion 712 has an uneven surface due to the two first ribs 717. Therefore, the creepage distance D is longer than when the rear surface side of the second portion 712 is flat.

[0058] 1, case 200 is made of resin, for example, polyphenylene sulfide (PPS), which is a thermoplastic resin. Case 200 is formed in the shape of a substantially rectangular box, and has an opening 201 on the top surface.

[0059] The case 200 is provided with mounting tabs 210 on the left and right outer surfaces and the outer bottom surface. Each mounting tab 210 has an insertion hole 211 formed therethrough in the front-to-rear direction. A metal collar 212 is fitted into the insertion hole 211 to increase the strength of the hole. When the film capacitor 1 is installed in an installation location such as an external device, these mounting tabs 210 are fixed to the installation location with screws or the like.

[0060] The filling resin 300 is a thermosetting resin such as an epoxy resin.

[0061] The capacitor element unit 100 is housed in the case 200 through the opening 201. Filling resin 300 in a liquid state is injected through the opening 201 into the case 200 with the capacitor element unit 100 housed therein. The filling resin 300 fills the case 200 up to the vicinity of the opening 201, and when the injection of the filling resin 300 is completed, the case 200 is heated. This causes the filling resin 300 in the case 200 to harden. In this way, the film capacitor 1 is completed.

[0062] The film capacitor 1 is mounted on an external device or the like. The external device or the like is provided with four positive external terminals 2a and four negative external terminals 2b, each of which takes the form of a bus bar. For example, if the first bus bar 500 is the positive bus bar and the second bus bar 600 is the negative bus bar, as shown in FIG. 1 , the four external terminals 2a pass through the openings 513 from the rear and come into contact with the four connection terminals 520 of the first bus bar 500, and are connected to these connection terminals 520 by a joining method such as soldering. Furthermore, the four external terminals 2b pass through the three overlapping openings 613, 716, and 514 from the rear and come into contact with the four connection terminals 620 of the second bus bar 600, and are connected to these connection terminals 620 by a joining method such as soldering.

[0063] <Method of manufacturing insulating members> Next, a method for manufacturing the insulating member 700 will be described.

[0064] Fig. 7 is a cross-sectional view of a mold 800 used for injection molding of the insulating member 700. Figs. 8(a) and 8(b) are plan views of a first member 801 and a second member 802 constituting the mold 800, respectively, as viewed from their parting surfaces. Note that for convenience, Fig. 8(a) shows the outline of a first molding surface 811 with a dashed line, and Fig. 8(b) shows a gate 820 with a dashed line.

[0065] The insulating member 700 is formed by injection molding using a mold 800 in a molding process.

[0066] The mold 800 is made of steel and is configured by joining a first member 801, which is a core, and a second member 802, which is a cavity. A mold section 810 having the shape of the insulating member 700 is formed inside the mold 800. The mold section 810 includes a first molding surface 811 for forming a rear surface 710b of the main body section 710 of the insulating member 700, and a second molding surface 812 for forming a front surface 710a of the main body section 710 facing away from the rear surface 710b.

[0067] First molding surface 811 includes a substantially cylindrical protruding portion 813 that protrudes toward second molding surface 812 at a position corresponding to the center of main body 710. Second molding surface 812 also includes a substantially cylindrical recessed portion 814 that houses protruding portion 813. A gap is formed between protruding portion 813 and recessed portion 814. The distance between tip surface 813a of protruding portion 813 and bottom surface 814a of recessed portion 814 is larger than the distance between first molding surface 811 and second molding surface 812 around it, and the portion between tip surface 813a and bottom surface 814a forms large gap portion 815.

[0068] On the first molding surface 811, a gate 820, which is an inlet for injecting resin into the mold portion 810, is formed on the tip surface 813a of the protrusion 813. The gate 820 is circular and opens to the large gap portion 815. On the mold 800, a runner 830 connected to the gate 820 is formed on the first member 801.

[0069] In the molding process, gate 820 is opened by a valve (not shown), and molten resin is injected from gate 820 through runner 830 into mold section 810. As shown by the arrows in FIGS. 7 and 8, the resin first flows into large gap section 815 of mold section 810. Then, the resin flows radially from large gap section 815 and spreads around. This causes the entire mold section 810 to be filled with resin.

[0070] Here, because gate 820 is provided on first molding surface 811 of mold portion 810 that constitutes the surface (rear surface 710b) of main body portion 710 of insulating member 700, resin can be injected from a portion close to the center of plate-shaped main body portion 710. This shortens the distance that resin flows within mold portion 810, making it easier for the resin to spread throughout the entire interior of mold portion 810. Furthermore, large gap portion 815 serves as a reservoir for the resin that has flowed into mold portion 810 from gate 820, improving the fluidity of the resin within mold portion 810 and shortening the time it takes for the resin to spread throughout the entire interior of mold portion 810.

[0071] The resin filled in mold part 810 cools to form insulating member 700. When filling of mold part 810 with resin is completed, gate 820 is closed by a valve. At this time, resin remains near gate 820, and this resin cools to form gate mark 715. Thereafter, mold 800 is separated, and insulating member 700 is removed from the inside.

[0072] 4(a) and 4(b) is completed. A protruding portion 714 is formed in the main body portion 710 of the insulating member 700 by filling the space between the protruding portion 813 and the recessed portion 814 of the mold portion 810 with resin. The tip of the protruding portion 714 is thicker than the other portions of the main body portion 710. A gate mark 715 protruding rearward is formed in the recessed surface on the back side of the protruding portion 714.

[0073] <Effects of the embodiment> As described above, according to this embodiment, the following effects are achieved.

[0074] The first bus bar 500 includes a non-overlapping portion 512 that is continuous with the first overlapping portion 511 and does not overlap with the second overlapping portion 611 of the second bus bar 600, and a connection terminal portion 520 that protrudes from the non-overlapping portion 512 and is connected to the external terminal 2a. The insulating member 700 includes a flat first portion 711 that is interposed between the first overlapping portion 511 and the second overlapping portion 611, a flat second portion 712 that is continuous with the first portion 711 and overlaps the non-overlapping portion 512, and a first rib 717 that protrudes from the second portion 712 to the side opposite the non-overlapping portion 512 and extends in the left-right direction so as to be present in an overlapping range R where the range of the non-overlapping portion 512 and the range of the second overlapping portion 611 overlap when viewed in the up-down direction.

[0075] With this configuration, the amount by which the second portion 712 of the insulating member 700 extends toward the non-overlapping portion 512 of the first bus bar 500 (the vertical dimension of the second portion 712) can be reduced, while the creepage distance D between the non-overlapping portion 512 of the first bus bar 500 and the second overlapping portion 611 of the second bus bar 600 in the vertical direction can be increased.

[0076] In addition, multiple (two) first ribs 717 are provided in a line spaced apart relationship in the vertical direction, and the insulating member 700 includes a second rib 718 that is provided outside the overlapping range R in the horizontal direction and connects the multiple first ribs 717.

[0077] According to this configuration, by providing multiple first ribs 717, it is possible to reduce the height (amount of protrusion) of the first ribs 717 while ensuring the same creepage distance D. Also, by being connected by the second ribs 718, the multiple first ribs 717 are reinforced. Furthermore, because the second ribs 718 are provided outside the overlapping range R in the left-right direction, no portion is created where the creepage distance D is shortened.

[0078] Furthermore, if the second rib 718 is provided inside the overlapping range R in the left-right direction, the creeping distance D will be shortened in the area where the second rib 718 exists because multiple first ribs 717 are connected by the second rib 718.

[0079] Furthermore, the first bus bar 500 has a plurality (four) of connection terminal portions 520 that protrude from the non-overlapping portion 512 to the side opposite the second portion 712 and are arranged side by side with gaps in the left-right direction. The non-overlapping portion 512 has a plurality of openings 513 that are adjacent to the connection terminal portions 520 and through which the external terminals 2a are passed, and are arranged side by side in the left-right direction. The second portion 712 of the insulating member 700 does not overlap the plurality of connection terminal portions 520.

[0080] According to this configuration, when the external terminal 2a is passed through the opening 513 and connected to the connection terminal portion 520, the second portion 712 of the insulating member 700 is unlikely to interfere with this connection work.

[0081] Furthermore, even if the second portion 712 is configured in this manner so as not to overlap the connection terminal portion 520, the vertical dimension of the second portion 712 is unlikely to increase in order to increase the creepage distance D, and therefore the vertical dimension of the non-overlapping portion 512 is unlikely to increase, and the first bus bar 500 is unlikely to become large.

[0082] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and application examples of the present invention can be modified in various ways in addition to the above-described embodiments.

[0083] For example, in the above embodiment, two first ribs 717 and two second ribs 718 connecting these first ribs 717 are formed on the second portion 712 of the insulating member 700. However, as shown in Fig. 9(a), the two second ribs 718 do not necessarily have to be formed on the second portion 712 of the insulating member 700.

[0084] In the above embodiment, two first ribs 717 are formed on the second portion 712 of the insulating member 700. However, the number of first ribs 717 can be changed as appropriate. For example, to ensure a creepage distance D of the same length as in the above embodiment, as shown in FIG. 9(b), three first ribs 717a may be formed on the second portion 712, each of which is shorter in height (protrusion amount) than the two first ribs 717 arranged vertically. The three first ribs 717a are connected at their left and right ends by a second rib 718a. Alternatively, as shown in FIG. 9(c), one first rib 717b may be formed on the second portion 712, each of which is taller than the two first ribs 717 and has the same length. The more first ribs there are, the lower the height can be, which reduces the likelihood of interference with surrounding components when the film capacitor 1 is installed in an external device. Furthermore, the fewer the number of first ribs, the simpler the structure of the second portion 712, which makes the insulating member 700 easier to manufacture.

[0085] Furthermore, in the above embodiment, the first bus bar 500 is configured such that the four connection terminal portions 520 protrude from the non-overlapping portion 512 toward the side opposite the second portion 712 (front side) of the insulating member 700. However, the number of connection terminal portions 520 can be changed as appropriate. When the number of connection terminal portions 520 is changed, the number of openings 513 is also changed accordingly. In addition, the formation positions and protruding directions of the connection terminal portions 520 in the non-overlapping portion 512 can also be changed as appropriate. For example, the connection terminal portions 520 may protrude from the non-overlapping portion 512 toward the second portion 712 (rear side). In addition, the connection terminal portions 520 may protrude upward, leftward, or rightward from the upper end, leftward, or rightward end of the non-overlapping portion 512.

[0086] Furthermore, in the above embodiment, first overlapping portion 511 and non-overlapping portion 512 of first bus bar 500 have the same width in the left-right direction. However, first overlapping portion 511 and non-overlapping portion 512 may have different widths in the left-right direction.

[0087] Furthermore, the shapes of the first overlapping portion 511 and non-overlapping portion 512 of the first busbar 500 and the second overlapping portion 611 of the second busbar 600 do not have to be rectangular as in the above embodiment, and may be any suitable shape.

[0088] Furthermore, in the above embodiment, the film capacitor 1 is provided with one capacitor element 400. However, the number of capacitor elements 400 may be two or more, and may be changed as appropriate.

[0089] Furthermore, in the above embodiment, capacitor element 400 is formed by stacking two metallized films with aluminum vapor-deposited on a dielectric film and then rolling or laminating the stacked metallized films. However, capacitor elements 400 may also be formed by stacking a metallized film with aluminum vapor-deposited on both sides of a dielectric film and an insulating film, and then rolling or laminating the resulting film.

[0090] Furthermore, in the above embodiment, the film capacitor 1 is given as an example of the capacitor of the present invention. However, the present invention can also be applied to capacitors other than the film capacitor 1.

[0091] In addition, the embodiments of the present invention can be modified in various ways as appropriate within the scope of the technical ideas set forth in the claims.

[0092] In the description of the above embodiment, terms indicating directions such as "upper" and "lower" indicate relative directions that depend only on the relative positional relationship of the components, and do not indicate absolute directions such as vertical or horizontal. [Industrial Applicability]

[0093] The present invention is useful for capacitors used in various electronic devices, electrical devices, industrial devices, vehicle electrical equipment, and the like. [Explanation of symbols]

[0094] 1. Film capacitor (capacitor) 400 Capacitor element 500 1st bus bar 511 First Polymerization Section 512 Non-polymerized part 513 Opening 520 Connection terminal 600 2nd bus bar 611 Second Polymerization Section 700 Insulating materials 711 Part 1 712 Part 2 717 First rib (protrusion) 718 Second rib (connection part)

Claims

1. a capacitor element; a first bus bar and a second bus bar connected to the capacitor element; an insulating member disposed between the first bus bar and the second bus bar, the first bus bar includes a first overlapping portion, the second bus bar includes a second overlapping portion, The first polymerization portion and the second polymerization portion overlap each other, the insulating member is disposed between the first overlapping portion and the second overlapping portion, The first bus bar is a non-polymerization portion that is continuous with the first polymerization portion and does not overlap with the second polymerization portion; a connection terminal portion protruding from the non-overlapping portion and connected to an external terminal, The insulating member is a first portion interposed between the first polymerization portion and the second polymerization portion; a second portion continuous with the first portion and overlapping the non-overlapping portion; a protruding portion protruding from the second portion to an opposite side to the non-overlapping portion, The protruding portion extends in a second direction perpendicular to a first direction in which the first overlapping portion and the non-overlapping portion are aligned. A capacitor characterized by:

2. 2. The capacitor according to claim 1, The protrusion is configured by a plurality of protrusions arranged at intervals in the first direction. A capacitor characterized by:

3. 3. The capacitor according to claim 2, The insulating member includes a connecting portion that connects the plurality of protrusions. A capacitor characterized by:

4. 4. The capacitor according to claim 3, The connecting portion is provided outside a range in which the non-overlapping portion and the second overlapping portion overlap in the second direction. A capacitor characterized by:

5. The capacitor according to any one of claims 1 to 4, the connection terminal portion includes a plurality of connection terminal portions that protrude from the non-overlapping portion to a side opposite the second portion and are arranged at intervals in the second direction, a plurality of openings, through which the external terminals are passed, adjacent to the connection terminal portions, are formed in the non-overlapping portion and are aligned in the second direction; the second portion does not overlap the plurality of connection terminal portions; A capacitor characterized by:

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