COIL COMPONENT

Abstract

Coil component (10), comprising: a cylindrical core (10C) with a columnar winding core section (11), a first flange section (20) connected to a first end of the winding core section (11) in a direction along a central axis (C) of the winding core section (11), and a second flange section (30) connected to a second end of the winding core section (11) opposite the first end; a first metal connection (41) attached to the first flange section (20); and a wire (51) which is wound around the winding core section (11) and has a first connecting end which is attached to the first metal terminal (41), where an axis orthogonal to the central axis (C) is defined as a first axis (X) and one of the directions along the first axis (X) is defined as a first positive direction (X1), wherein the first flange section (20) projects outwards in the first positive direction (X1) with respect to the winding core section (11), wherein the first metal connection (41) has: a bond section (410) attached to the first flange section (20), with an adhesive (60) arranged between them; a mounting section (430) located closest to one side of the first positive direction (X1) in the first metal terminal (41); and a coupling section connecting the bonding section (410) and the assembly section (430), and wherein the assembly section (430) is spaced from the cylinder core (10C) on the side of the first positive direction (X1), wherein the first flange section (20) has an upper surface (21A) facing the side of the first positive direction (X1) and a projecting section (22) extending from the upper surface (21A) in the direction of the side of the first positive direction (X1), wherein, where a direction opposite to the first positive direction (X1) is defined as a first negative direction (X2), and an axis orthogonal to both the central axis (C) and the first axis (X) is defined as a second axis (Y), the projecting section (22) has an upper end face (22A) facing the mounting section (430) from one side of the first negative direction (X2), and a side face (22B) connecting the upper end face (22A) of the projecting section (22) and the upper face (21A) of the first flange section (20) and intersecting the second axis (Y), and wherein the first metal connection (41) has an extension section (440) extending from the mounting section (430) and in contact with the side surface (22B), wherein the extension section (440), when viewed in the direction along the central axis (C), has a section extending towards a center of the protruding section (22) in the first negative direction (X2).

Description

TECHNICAL BACKGROUND 1. AREA OF INVENTION

[0001] The present invention relates to a coil component. 2. STATE OF THE ART

[0002] DE 10 2019 212 672 A1, WO 2015 / 045 955 A1, and DE 10 2014 111 283 A1 each disclose coil components. The coil component described in the Japanese patent application JP 2012-89 804 A comprises a core section and two flange sections. The core section has the shape of a rectangular prism. The two flange sections are connected to both ends of the core section. Each flange section projects from the core section in a first positive direction, orthogonal to a central axis of the core section. The material of the core section and the flange section is a magnetic material. The core section and the flange section together form the core of the coil component.

[0003] The coil assembly comprises multiple metal terminals and two wires. Each metal terminal has a mounting section. The mounting section is located closest to the side of the first positive direction beneath the metal terminals. This mounting section is the part that comes into contact with a substrate when the coil assembly is mounted on the substrate, etc. The mounting section is attached to a surface of the flange section facing in the first positive direction, with an adhesive placed between them. PRESENTATION OF THE INVENTION

[0004] The coil component, as described in Japanese patent application JP 2012-89 804 A, is mounted on a substrate, etc. At this stage, the mounting section of the metal terminal is attached to the substrate, etc., with an intermediate solder joint. A difference in the degree of thermal expansion exists between the coil component and the substrate, since the coefficient of thermal expansion of the coil component differs from that of the substrate, etc. Therefore, when the temperature changes, a force acts on the solder joint located between the mounting section of the metal terminal and the substrate, etc. Due to the force caused by the temperature change, a crack or similar defect may occur in the solder joint, and the bond strength of the coil component to the substrate, etc., may decrease.

[0005] Although the example described above involves connecting the mounting section of the metal connection to the substrate or the like with the solder placed between them, the same problem occurs regardless of the type of connection, as long as the mounting section is attached to the substrate or the like.

[0006] To solve the above problems, the present invention provides a coil component comprising: a cylindrical core with a columnar winding core section, a first flange section connected to a first end of the winding core section in a direction along a central axis of the winding core section, and a second flange section connected to a second end of the winding core section opposite the first end; a first metal terminal attached to the first flange section, and a wire wound around the winding core section having a first connecting end connected to the first metal terminal, wherein an axis orthogonal to the central axis is defined as a first axis, and one of the directions along the first axis is defined as a first positive direction.wherein the first flange section projects outwards in the first positive direction with respect to the winding core section, wherein the first metal connection comprises: a bond section attached to the first flange section by means of an interposed adhesive; a mounting section located nearest to the side of the first positive direction in the first metal connection; and a coupling section connecting the bond section and the mounting section, wherein the mounting section is separated from the cylindrical core on the side of the first positive direction, wherein the first flange section has an upper surface facing the side of the first positive direction and a projecting section extending from the upper surface towards the side of the first positive direction, wherein, where a direction opposite to the first positive direction is defined as a first negative direction, and an axis,which is orthogonal to both the central axis and the first axis, is defined as a second axis, the projecting section has an upper end face facing the mounting section from one side of the first negative direction, and a side face connecting the upper end face of the projecting section and the upper face of the first flange section and intersecting the second axis, and wherein the first metal connection has an extension section extending from the mounting section and in contact with the side face, wherein the extension section, when viewed in the direction along the central axis, has a section extending towards a center of the projecting section in the first negative direction.

[0007] In the configuration described above, when the coil component is mounted on the substrate or similar with its first positive orientation towards the substrate or similar, the mounting section of the first metal terminal is connected to the substrate or similar. If a difference in the degree of thermal deformation occurs between the coil component and the substrate or similar when the coil component is mounted on the substrate or similar, this difference can be absorbed by elastic deformation of the mounting section. Consequently, it is possible to suppress the force caused by the difference in thermal deformation acting between the mounting section of the first metal terminal and the substrate or similar, thus preventing a decrease in the mounting strength of the coil component on the substrate or similar.

[0008] According to one aspect of the present disclosure, a decrease in the assembly strength of the coil component is prevented. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a perspective view of a coil component; Fig. 2 is a top view of the coil component; Fig. 3 is a side view of the area surrounding a first metal terminal in the coil component; Fig. Figure 4 is a perspective view of the area around the first metal terminal in the coil component; Fig. 5 is a front view of the area around the first metal terminal in the coil component; Fig. 6 is a front view of the first metal connection in the coil component; Fig. 7 is a view that shows part of a route along line 7-7 in Fig. The 2nd recorded end view shows; and Fig. Figure 8 is a view that represents a modification of an extension section and a joining section of a coil component. DETAILED DESCRIPTION OF THE INVENTION

[0009] The following describes an embodiment of a coil component. The drawings may show enlarged components for better understanding. The dimensions of the components may differ from the actual dimensions or from those shown in another drawing. <gesamtkonfiguration>

[0010] As in Fig. As shown in Figure 1, a coil component 10 has a cylindrical core 10C and an upper plate 12.

[0011] The cylindrical core 10C has a winding core section 11, a first flange section 20 and a second flange section 30.

[0012] The winding core section 11 has the shape of a square prism. The material of the winding core section 11 is a non-conductive material. Specifically, the material of the winding core section 11 could be, for example, aluminum oxide, a Ni-Zn-based ferrite, resin, a mixture thereof, etc.

[0013] The first flange section 20 is attached to a first end of the winding core section 11 in one direction along a central axis C. The second flange section 30 is attached to a second end of the winding core section 11 in the same direction along the central axis C. The material of the first flange section 20 and the second flange section 30 is the same non-conductive material as that of the winding core section 11. The first flange section 20 and the second flange section 30 are formed integrally with the winding core section 11.

[0014] In this case, a specific axis orthogonal to the central axis C is defined as the first axis X. In the present embodiment, the first axis X is parallel to two of the four sides of the winding core section 11 when viewed in the direction along the central axis C. An axis orthogonal to both the central axis C and the first axis X is defined as the second axis Y. Furthermore, in the present embodiment, an axis parallel to the central axis C is defined as the third axis Z. One of the directions along the first axis X is defined as a first positive direction X1, and a direction opposite to the first positive direction X1 is defined as a first negative direction X2. Analogously, one of the directions along the second axis Y is defined as a second positive direction Y1, and a direction opposite to the second positive direction Y1 is defined as a second negative direction Y2.One of the directions along the third axis Z is defined as a third positive direction Z1, and a direction opposite to the third positive direction Z1 is defined as a third negative direction Z2. In the present embodiment, a direction from the winding core section 11 to the first flange section 20 is defined as a third positive direction Z1, and a direction from the winding core section 11 to the second flange section 30 is defined as a third negative direction Z2.

[0015] The first flange section 20 projects outwards relative to the winding core section 11 in the direction along the first axis X and in the direction along the second axis Y. The first flange section 20 has a symmetrical shape in the direction along the second axis Y. The first flange section 20 has an outer end surface 20A. The outer end surface 20A is a surface that faces the third positive direction Z1 from the outer surfaces of the first flange section 20.

[0016] The first flange section 20 has a main body section 21 and a projecting section 22. The main body section 21 has the shape of a quadrilateral prism that is flat overall in the direction along the third axis Z. When viewed in the third negative direction Z2, the edge of the main body section 21 on the side of the first negative direction X2 is parallel to the second axis Y. When viewed in the third negative direction Z2, the edge of the main body section 21 on the side of the first positive direction X1 is parallel to the second axis Y. Therefore, the main body section 21 has a top surface 21A facing the side of the first positive direction X1.

[0017] The projecting section 22 extends from the upper surface 21A of the main body section 21 in the direction of the first positive direction X1. The projecting section 22 has the shape of a truncated quadrilateral, the dimension of which decreases in the direction along the second axis Y towards the first positive direction X1. The projecting section 22 is located substantially at the center of the main body section 21 in the direction along the second axis Y. The dimension of the projecting section 22 in the direction along the third axis Z is the same as the dimension of the main body section 21 in the direction along the third axis Z.

[0018] The projecting section 22 has an upper end surface 22A and two side surfaces 22B. The upper end surface 22A is a surface facing the side of the first positive direction X1 from the outer surfaces of the projecting section 22. Each of the side surfaces 22B is a surface connecting the upper end surface 22A and the upper surface 21A of the main body part 21. One of the side surfaces 22B faces the side of the second positive direction Y1. The other of the side surfaces 22B faces the side of the second negative direction Y2. The main body section 21 and the projecting section 22 are formed in one piece. This means that there is no clear boundary between the main body part 21 and the projecting part 22 within the first flange section 20.

[0019] The second flange section 30 has a symmetrical shape with respect to the first flange section 20 in the direction along the third axis Z. This means that the second flange section 30 projects outwards with respect to the winding core section 11 in the direction along the first axis X and in the direction along the second axis Y. The second flange section 30 has an outer end surface 30A. The outer end surface 30A is a surface that faces the third negative direction Z2 below the outer surfaces of the second flange section 30. The second flange section 30 has a main body section 31 and a projecting section 32. The configurations of the main body section 31 and the projecting section 32 are similar to those of the main body section 21 and the projecting section 22 of the first flange section 20. This means that the main body section 31 has an upper surface 31A that faces the side of the first positive direction X1.The preceding section 32 has an upper end face 32A and two side faces 32B.

[0020] In the present embodiment, the maximum dimension of the cylinder core 10C in the direction along the first axis X is 1.4 mm. The maximum dimension of the cylinder core 10C in the direction along the second axis Y is 2.5 mm. The maximum dimension of the cylinder core 10C in the direction along the third axis Z is 3.2 mm.

[0021] The upper plate 12 has a rectangular shape. The upper plate 12 is flat in the direction of the first axis X. The long side of the upper plate 12 is parallel to the third axis Z. The short side of the upper plate 12 is parallel to the second axis Y. The upper plate 12 is located on the side of the first negative direction X2 with respect to the cylindrical core 10C. The upper plate 12 is connected to both the surface of the first flange section 20, which faces in the first negative direction X2, and the surface of the second flange section 30, which also faces in the first negative direction X2. This means that the upper plate 12 bridges between the first flange section 20 and the second flange section 30. The material of the upper plate 12 is the same non-conductive material as that of the cylindrical core 10C.

[0022] The coil component 10 has a first metal connection 41, a second metal connection 42, a third metal connection 43 and a fourth metal connection 44.

[0023] The first metal connection 41 is attached to the first flange section 20. The first metal connection 41 is located on the side of the second positive direction Y1 with respect to the center of the first flange section 20 in the direction along the second axis Y. The second metal connection 42 is attached to the first flange section 20. The second metal connection 42 is located on the side of the second negative direction Y2 with respect to the center of the first flange section 20 in the direction along the second axis Y. The third metal connection 43 is attached to the second flange section 30. The third metal connection 43 is located on the side of the second positive direction Y1 with respect to the center of the second flange section 30 in the direction along the second axis Y. The fourth metal connection 44 is attached to the second flange section 30.The fourth metal connection 44 is located on the side of the second negative direction Y2 with respect to the center of the second flange section 30 in the direction along the second axis Y. Details of the first metal connection 41 to the fourth metal connection 44 are described later.

[0024] As in Fig. As shown in Figure 2, the coil component 10 has a first wire 51 and a second wire 52. Although not shown, the first wire 51 consists of a copper wire and an insulating film. The insulating film covers the outer surface of the copper wire. The first wire 51 has a substantially circular shape in a section orthogonal to the direction in which the first wire 51 extends. The outer diameter L1 of the first wire 51 is approximately 50 µm.

[0025] A first connection end of the first wire 51 is attached to the first metal terminal 41 by thermocompression bonding. The first wire 51 extends from the first metal terminal 41 in the direction of the ridge line of the winding core section 11 on the side of the first negative direction X2 and the side of the second positive direction Y1. Viewed in the third negative direction Z2, the first wire 51 is wound around the winding core section 11 such that it runs clockwise when moving in the direction of the third negative direction Z2. A second connection end of the first wire 51, opposite the first connection end, extends from the ridge line of the winding core section 11 on the side of the first positive direction X1 and the side of the second negative direction Y2 in the direction of the third metal terminal 43. The second connection end of the first wire 51 is connected to the third metal terminal 43 by thermocompression bonding.

[0026] Thermocompression bonding is a process in which a wire is sandwiched between a metal terminal and a heated fixture, and the wire is fused to the metal terminal by melting. As a result of this bonding process, the insulating foil near the bonded section of the wire is detached, exposing the copper wire.

[0027] The second wire 52 has the same configuration as the first wire 51. This means that the second wire 52 consists of a copper wire and an insulating layer. The outer diameter L1 of the second wire 52 is approximately 50 µm.

[0028] A first connection end of the second wire 52 is attached to the second metal terminal 42 by thermocompression bonding. The second wire 52 extends from the second metal terminal 42 in the direction of the ridge line of the winding core section 11 on the side of the first positive direction X1 and the side of the second positive direction Y1. Viewed in the third negative direction Z2, the second wire 52 is wound around the winding core section 11 such that it runs clockwise when moving in the direction of the third negative direction Z2. A second connection end of the second wire 52, opposite the first connection end, extends from the ridge line of the winding core section 11 on the side of the first negative direction X2 and the side of the second negative direction Y2 in the direction of the fourth metal terminal 44. The second connection end of the second wire 52 is attached to the fourth metal terminal 44 by thermocompression bonding. <Erster Metallanschluss>

[0029] As in Fig. As shown in Figure 6, the first metal connection 41 has a bonding section 410, a coupling section 420, an assembly section 430, an extension section 440, and a joining section 450. The bonding section 410, the coupling section 420, the assembly section 430, the extension section 440, and the joining section 450 are formed in one piece. This means that there is no clear boundary between these parts within the first metal connection 41.

[0030] In the following description, among the directions along the central axis C, a direction from each metal terminal towards the winding core section 11 can be designated as an inward direction, and a direction opposite to the inward direction can be designated as an outward direction. For example, the inward direction of the first metal terminal 41 towards the winding core section 11 coincides with the third negative direction Z2. The outward direction with respect to the first metal terminal 41 coincides with the third positive direction Z1. <bondabschnitt>

[0031] As in Fig. As shown in Figure 1, the bond section 410 is essentially in the shape of a plate. As in Fig. As shown in Figure 7, the bonding section 410 is attached to the outer end face 20A of the first flange section 20 by an interposed adhesive 60. This means that the bonding section 410 is connected to a surface that faces the third positive direction Z1 beneath the outer surfaces of the first flange section 20. As described above, the bonding section 410 is a section of the first metal connection 41 that faces the outer end face 20A of the first flange section 20 from the side of the third positive direction Z1.

[0032] As in Fig. As shown in Figure 6, the bond section 410 has a relative surface area 411 and a recess 412. As shown in Fig. As shown in Figure 7, the relative surface 411 is a surface facing the outer end face 20A from the side of the third positive direction Z1, with the exception of the recess 412. This means that the relative surface 411 of the first metal terminal 41 is a surface facing the third negative direction Z2.

[0033] As in Fig. As shown in Figure 6, the bond section 410 has a wide section 410A and a narrow section 410B. The wide section 410A is a portion that includes one end of the bond section 410 in the first negative direction X2. The wide section 410A has a substantially rectangular shape, with two adjacent corners chamfered on the side of the first negative direction X2 when viewed in the third positive direction Z1. The dimension of the wide section 410A in the direction along the second axis Y is substantially constant, except for the chamfered sections. The wide section 410A includes a section with the largest dimension in the direction along the second axis Y in the relative surface 411 and the recess 412.

[0034] The narrow section 410B is adjacent to the wide section 410A on the side of the first positive direction X1. In particular, the narrow section 410B extends in the first positive direction X1 from one end of the wide section 410A in the second negative direction Y2. Fig. Figure 6 shows a boundary between the narrow section 410B and the wide section 410A, indicated by an imaginary dashed line. The narrow section 410B has a smaller dimension along the second axis Y than the wide section 410A. The dimension of the narrow section 410B along the second axis Y is 1 / 2 or less than the dimension of the wide section 410A along the second axis Y. The dimension of the narrow section 410B along the second axis Y is essentially constant, except for a coupling section with the wide section 410A.

[0035] As in Fig. As shown in Figure 7, the recess 412 is recessed relative to the surface 411. The adhesive 60 is contained within the recess 412. However, the adhesive 60 is not contained within a portion of the recess 412 that includes an end 431 in the first positive direction X1.

[0036] As in Fig. As shown in Figure 6, the recess 412 is located above the wide section 410A and the narrow section 410B. The end 431 of the recess 412 on the side of the first negative direction X2 is located on the side of the first positive direction X1 with respect to the end of the bond section 410 in the first negative direction X2. This means that the recess 412 is not open towards the end of the bond section 410 in the first negative direction X2. As shown in Fig. As shown in Figure 7, the end 431 of the recess 412 is located on the side of the first negative direction X2, as seen from the central axis C.

[0037] One end 432 of the recess 412 on the side of the first positive direction X1 is located, with respect to the end of the bond section 410 on the side of the first positive direction X1, on the side of the first negative direction X2. This means that the end 432 of the recess 412 on the side of the first positive direction X1 is located on the side of the first negative direction X2, as seen from the upper end face 22A of the first flange section 20. As shown in Fig. As shown in Figure 7, the end 432 of the recess 412 is located on the side of the first positive direction X1, as seen from the end of the winding core section 11 on the side of the first positive direction X1.

[0038] As in Fig. As shown in Figure 6, the recess 412 of the narrow section 410B extends along the second axis Y over the entire narrow section 410B. Furthermore, the recess 412 of the wide section 410A extends along the second axis Y over the entire wide section 410A. This means that, along the second axis Y, the maximum dimension of the recess 412 located in the wide section 410A is larger than the maximum dimension of the recess 412 located in the narrow section 410B.

[0039] The edge of the recess 412 on the side of the first negative direction X2 is essentially parallel to the second axis Y. The edge of the recess 412 on the side of the first positive direction X1 is essentially parallel to the second axis Y. The distance from the edge of the recess 412 on the side of the first negative direction X2 to the boundary line between the wide section 410A and the narrow section 410B is greater than the distance from the boundary line between the wide section 410A and the narrow section 410B to the edge of the recess 412 on the side of the first positive direction X1. This means that the area of ​​the section of the recess 412 located in the wide section 410A is larger than the area of ​​the section of the recess 412 located in the narrow section 410B.

[0040] The dimension of the recess 412 in the direction along the third axis Z, i.e., the depth of the recess 412, is essentially constant, except for the edge of the recess 412. Therefore, the volume V1 of the section of the recess 412 located in the wide section 410A is larger than the volume V2 of the section of the recess 412 located in the narrow section 410B, reflecting the area difference described above.

[0041] As in Fig. As shown in Figure 7, an area where the relative surface 411 and the recess 412 are combined, i.e., an area of ​​the first metal connection 41 facing the outer end face 20A of the first flange section 20, is defined as the facing area P. At this point, as in Fig. As shown in Figure 6, viewed in the direction along the central axis C, the area of ​​the recess 412 facing the outer end face 20A of the first flange section 20 is 1 / 2 or more of the facing area P. This means that the area of ​​the recess 412 facing the outer end face 20A of the first flange section 20 is greater than or equal to the area of ​​the relative surface 411. Furthermore, as shown in Fig. Figure 7 shows that the maximum dimension L3 of the recess 412 in the direction along the first axis X is 1 / 2 or more than the maximum dimension L4 of the facing area P in the direction along the first axis X. It is noted that "when viewed in the direction along the central axis C" is not limited to those that can be directly visually perceived and includes a case where it is viewed while being transmitted as described above. <kopplungsabschnitt>

[0042] As in Fig. As shown in Figure 7, the coupling section 420 is connected to one end of the bond section 410 in the first positive direction X1. Fig. Figure 6 shows the virtual boundary between the coupling section 420 and the bond section 410 as represented by a dashed line. The coupling section 420 extends from the bond section 410 in the first positive direction X1. This means that the coupling section 420 projects from the first flange section 20 in the direction along the first axis X when viewed along the third axis Z. Specifically, the coupling section 420 projects towards the side of the first positive direction X1 with respect to the upper end face 22A of the first flange section 20. The coupling section 420 is bent by approximately 90 degrees along this path. One end of the coupling section 420, opposite the bond section 410, faces the third negative direction Z2. <montageabschnitt>

[0043] As in Fig. As shown in Figure 4, the mounting section 430 is connected to one end of the coupling section 420, which is opposite the bonding section 410. The mounting section 430 has the form of a flat plate. The main surface of the mounting section 430 is orthogonal to the first axis X. The mounting section 430 is part of the first metal terminal 41 that is closest to the side of the first positive direction X1. The mounting section 430 is separated from the upper end face 22A of the first flange section 20 on the side of the first positive direction X1. This means that there is a gap between the mounting section 430 and the upper end face 22A. The mounting section 430 is separated from each outer surface of the cylindrical core 10C, including the upper end face 22A. The mounting section 430 is a section that faces a substrate when the coil component 10 is mounted on the substrate.

[0044] As in Fig. As shown in Figure 5, the shortest distance W1 from the mounting section 430 to the upper end surface 22A in the direction along the first axis X is greater than the minimum dimension W2 of the mounting section 430 in the direction along the first axis X. In the present embodiment, the dimension of the mounting section 430 in the direction along the first axis X is the plate thickness of the first metal connection 41. The plate thickness is essentially constant. The plate thickness of the first metal connection 41 is essentially constant at the bonding section 410, with the exception of the recess 412, the coupling section 420, the mounting section 430, and the extension section 440. <erstreckungsabschnitt>

[0045] As in Fig. As shown in Figure 4, the extension section 440 is connected to one end of the assembly section 430 on the side of the second positive direction Y1. The extension section 440 extends substantially obliquely from the assembly section 430 in the direction of the second positive direction Y1 and the side of the first negative direction X2. The dimension of the extension section 440 in the direction along the third axis Z, i.e., the width dimension of the extension section 440, is substantially constant. As shown in Fig. As shown in Figure 5, the extension section 440, viewed along the third axis Z, extends such that it approaches the side surface 22B of the preceding section 22, which faces the side of the second positive direction Y1, as it moves in the first negative direction X2. The surface of the extension section 440 facing the second negative direction Y2 is in line contact with the side surface 22B of the preceding section 22. If the extension section 440 does not have a surface parallel to the side surface 22B, the extension section 440 is in line contact with the side surface 22B.

[0046] Specifically, as in Fig. Figure 5 shows that, among the angles formed by the side surface 22B and the top surface 21A when viewed in the third positive direction Z1, an angle on the side of the second positive direction Y1 and the side of the first positive direction X1 is defined as a first angle θ1. The extension section 440 has a section that extends linearly. Among the angles formed by the imaginary line VL0 passing through the midpoint of the linearly extending section and the top surface 21A, the angle on the side of the second positive direction Y1 and the side of the first positive direction X1 is defined as a second angle θ2. At this point, the second angle θ2 is smaller than the first angle θ1. <Fügeabschnitt>

[0047] As in Fig. As shown in Figure 4, the joining section 450 is connected to one end of the extension section 440 on the side of the first negative direction X2. The joining section 450 is essentially plate-shaped. The joining section 450 has a substantially rectangular shape, elongated in the direction of the third axis Z when viewed along the first axis X. As shown in Fig. As shown in Figure 3, the maximum dimension W4 of the joining section 450 in the direction along the third axis Z is larger than the maximum dimension W3 of the extension section 440 in the direction along the third axis Z, i.e., the width dimension of the extension section 440.

[0048] As in Fig. As shown in Figure 4, the joining section 450 of the upper surface 21A of the first flange section 20 faces the side of the first positive direction X1. A surface of the joining section 450 facing the first negative direction X2 is in contact with the upper surface 21A. Conversely, the surface of the joining section 450 facing the first negative direction X2 is not attached to the upper surface 21A. This means that the adhesive 60 and the like are not located between the surface of the joining section 450 facing the first negative direction X2 and the upper surface 21A.

[0049] Viewed in the direction along the first axis X, the joining section 450 does not protrude from the upper surface 21A of the first flange section 20 in the third negative direction Z2. This means that the end of the upper surface 21A of the first flange section 20 on the side of the third negative direction Z2 is located on the side of the third negative direction Z2 with respect to the end of the joining section 450 on the side of the third negative direction Z2.

[0050] The joining section 450 has a horizontal surface 451 and an inclined surface 452. The horizontal surface 451 points in the first positive direction X1. The horizontal surface 451 is the surface that lies closest to the side of the third positive direction Z1 among the outer surfaces of the joining section 450. Viewed in the direction along the first axis X, the horizontal surface 451 has a substantially rectangular shape.

[0051] The inclined surface 452 further comprises a first inclined surface 452A and a second inclined surface 452B. The first inclined surface 452A is a flat surface facing the side of the first positive direction X1 and the side of the third negative direction Z2. The first inclined surface 452A borders the horizontal surface 451 on the side of the third negative direction Z2. The first inclined surface 452A is located in the first negative direction X2 towards the third negative direction Z2.

[0052] The second inclined surface 452B is a flat surface facing the side of the first positive direction X1 and the side of the third negative direction Z2. The second inclined surface 452B borders the first inclined surface 452A on the side of the third negative direction Z2. The second inclined surface 452B is located in the first negative direction X2 towards the third negative direction Z2. The second inclined surface 452B extends to one end of the joining section 450 on the side of the third negative direction Z2.

[0053] As in Fig. Figure 3 shows that, when viewed along the second axis Y, an imaginary line VL1 is drawn, passing through the end E1 of the first inclined surface 452A on the side corresponding to the third positive direction Z1 and parallel to the central axis C. An acute angle formed by the first inclined surface 452A and the imaginary line VL1 is defined as angle P1. Viewed along the second axis Y, an imaginary line VL2 is drawn, passing through the end E2 of the second inclined surface 452B on the side corresponding to the third negative direction Z2 and parallel to the central axis C. The acute angle formed by the second inclined surface 452B and the imaginary line VL2 is defined as angle P2. At this point, angle P2 is larger than angle P1.

[0054] Both the first inclined surface 452A and the second inclined surface 452B are planar surfaces. Therefore, the tangent at end E1 of the first inclined surface 452A on the side of the third positive direction Z1 is a line that runs along the first inclined surface 452A. Similarly, the tangent at end E2 of the second inclined surface 452B on the side of the third negative direction Z2 is a line that extends along the second inclined surface 452B.

[0055] Furthermore, the distance L2 in the direction along the first axis X from the end E1 of the inclined surface 452 in the third positive direction Z1 to the end E2 of the inclined surface 452 in the third negative direction Z2 is approximately 70 µm. This means that the distance L2 in the direction along the first axis X from the end E1 of the inclined surface 452 in the third positive direction Z1 to the end E2 of the inclined surface 452 in the third negative direction Z2 is larger than the outer diameter L1 of the first wire 51. <Zweiter Metallanschluss 42 bis vierter Metallanschluss 44>

[0056] As in Fig. As shown in Figure 1, the second metal connection 42 has a shape that is the reverse of the first metal connection 41 in the direction along the second axis Y. Similar to the first metal connection 41, the second metal connection 42 is connected to the outer end face 20A of the first flange section 20 on the bond section 410. The third metal connection 43 has the same shape as the second metal connection 42. The third metal connection 43 is connected to the outer end face 30A of the second flange section 30 on the bond section 410. The fourth metal connection 44 has the same shape as the first metal connection 41. The fourth metal connection 44 is connected to the outer end face 30A of the second flange section 30 on the bond section 410. <Fügen des ersten Drahts und des Fügeabschnitts>

[0057] When the first wire 51 is attached to the joining section 450, the first connecting end of the first wire 51 is positioned on the horizontal surface 451, and a clamping device is pressed parallel to the horizontal surface 451. The clamping device is a heating chip. The clamping device is in contact with the first wire 51 on the horizontal surface 451 and a portion of the first wire 51 on the third positive Z1 side of the first inclined surface 452A. When the first wire 51 comes into contact with the clamping device, the insulating film in the first wire 51 melts. This means that the entire first wire 51 on the horizontal surface 451 and a portion of the first wire 51 on the first inclined surface 452A are stripped of their insulating layer, and the copper wire is exposed.Furthermore, at the time of thermocompression bonding, the first wire 51 on the horizontal surface 451 is compressed and flattened by the load of the clamping device. Similarly, a portion of the first wire 51 on the side of the third positive direction Z1 on the first inclined surface 452A, which is in contact with the clamping device, is flat. At the time of thermocompression bonding, a portion of the first wire 51 on the first inclined surface 452A and the first wire 51 on the second inclined surface 452B, which do not come into contact with the clamping device, are in a state in which the insulating film remains intact. Since the first wire 51 on the second inclined surface 452B does not come into contact with the clamping device, it is also not flat. <Betrieb der vorliegenden Ausführungsform>

[0058] When the first metal connection 41 is attached to the first flange section 20, the first metal connection 41 is initially positioned so that its relative surface 411 is in contact with the outer end face 20A. At this point, the first metal connection 41 is positioned so that the adhesive 60 is contained within the recess 412. The first metal connection 41 is then positioned so that the joining section 450 is in contact with the upper surface 21A. Furthermore, the first metal connection 41 is positioned so that the extension section 440 is in contact with the side surface 22B. When the first metal connection 41 is positioned in this way, the assembly section 430 is separated from the cylindrical core 10C on the side of the first positive direction X1. This means that the assembly section 430 is elastically deformable.It is assumed that the adhesive 60 contained in the recess 412 reaches the assembly section 430 along the coupling section 420 due to a capillary phenomenon. In this case, the adhesive 60 is located between the assembly section 430 and the upper end surface 22A. As long as the entire space between the assembly section 430 and the upper end surface 22A is not filled with the adhesive 60, the assembly section 430 is elastically deformable. This means that the assembly section 430 can be elastically deformed in a state in which a portion of a synthetic resin, such as the adhesive 60, is located between the assembly section 430 and the cylindrical core 10C. Therefore, "the assembly section 430 is separated from the cylindrical core 10C on the side of the first positive direction X1" encompasses a case in which a portion of a synthetic resin is contained between the assembly section 430 and the cylindrical core 10C. <Wirkungen der vorliegenden Ausführungsform>

[0059] The effects of the present embodiment are described below. The effects of the first metal connection 41 are described below for illustrative purposes; however, the same effects are obtained in every metal connection. (1) When the coil component 10 is mounted on a substrate or the like, with the first positive direction X1 facing the substrate, the mounting section 430 of the first metal terminal 41 is connected to the substrate. According to the above embodiment, the mounting section 430 is separated from the outer surface of the cylindrical core 10C. Therefore, if, in a state where the coil component 10 is mounted on the substrate, a difference in the degree of thermal deformation occurs between the coil component 10 and the substrate, the difference can be absorbed by the elastic deformation of the mounting section 430.As a result, it is possible to suppress the force caused by the difference in thermal deformation acting between the mounting section 430 of the first metal terminal 41 and the substrate or the like, so that it is also possible to prevent a decrease in the mounting strength of the coil component 10 on the substrate or the like. (2) According to the above embodiment, the extension section 440 is in contact with the side face 22B of the first flange section 20. According to the above configuration, when the first metal connection 41 is attached to the first flange section 20, the first metal connection 41 can be positioned relative to the first flange section 20 in the direction along the second axis Y by bringing the extension section 440 into contact with the side face 22B of the projecting section 22. Therefore, the accuracy of the mounting position of the first metal connection 41 in the direction of the second axis Y can be improved if the mounting section 430 is separated from the cylindrical core 10C. (3) According to the above embodiment, the shortest distance W1 from the mounting section 430 to the upper end face 22A in the direction along the first axis X is greater than the minimum dimension W2 of the mounting section 430 in the direction along the first axis X. According to this configuration, the curved section of the connecting section between the mounting section 430 and the coupling section 420 is located in the first positive direction X1 with respect to the upper end face 22A. Therefore, it is possible to prevent the adhesive 60 inserted between the bonding section 410 and the first flange section 20 from adhering to the mounting section 430 due to a capillary phenomenon. (4) It is assumed that the extension section 440 is in surface contact with the side surface 22B. In this case, if a manufacturing defect occurs in the shape of the extension section 440 or the shape of the protruding section 22, the extension section 440 cannot be brought into surface contact with the side surface 22B, and the first metal terminal 41 cannot be positioned. In this respect, in the embodiment above, the extension section 440 is in line contact with the side surface 22B. According to this configuration, the extension section 440 can be brought into contact with the side surface 22B if, as expected, some manufacturing defects occur during the shaping of the extension section 440 and the shaping of the protruding section 22. (5) In the above embodiment, in the bond section 410, the relative surface 411 is connected to the outer end surface 20A of the first flange section 20 below the outer surfaces of the first flange section 20. According to this configuration, the first metal connection 41 can be positioned with respect to the first flange section 20 not only in the direction along the second axis Y, but also in the direction along the central axis C. (6) In the above embodiment, the first metal connection 41 has the joining section 450, which faces the upper surface 21A of the first flange section 20 from the side of the first positive direction X1. The joining section 450 is in contact with the upper surface 21A. According to this configuration, the first metal connection 41 can be positioned with respect to the first flange section 20 not only in the direction along the second axis Y, but also in the direction along the first axis X. <modifizierung>

[0060] The present embodiment can be modified as follows. The present embodiment and the modifications below can be implemented in combination within a scope of protection that is not technically contradictory. A modification that applies to the first metal connection 41 to the fourth metal connection 44 is described by way of example only for the first metal connection 41.

[0061] • In the above embodiment, the configuration of the coil component 10 is not restricted. For example, the upper plate 12 on the coil component 10 can be omitted. The shape of the first flange section 20 is not limited to the shape of the above embodiment. For example, the protruding section 22 on the first flange section 20 can be omitted.

[0062] • In the above embodiment, the second wire 52 in the coil component 10 can be omitted. If, for example, the coil component 10 contains only the first wire 51, a metal connection can be attached to each flange section.

[0063] • In the above embodiment, the winding core section 11 may not have the shape of a square prism. For example, the cross-sectional shape of the winding core section 11 may be circular, elliptical, or polygonal, i.e., not square. • In the above embodiment, the shape of the first metal connection 41 is not limited to the example of the above embodiment. The first metal connection 41 can have the bonding section 410, the assembly section 430, and the coupling section 420.

[0064] • In the above embodiment, the joining section 450 can be separated from the upper surface 21A. Furthermore, the adhesive 60 can be contained between the joining section 450 and the upper surface 21A. • In the embodiment above, there may be no clear boundary between the first inclined surface 452A and the second inclined surface 452B in the joining section 450. This means that the inclined surface 452 can be configured such that the angle of inclination changes gently.

[0065] • In the embodiment above, the configuration of the joining section 450 is not limited to the example of the embodiment above. For example, the joining section 450 can have a second horizontal surface in addition to the horizontal surface 451.

[0066] • In the embodiment above, the horizontal surface 451 in the joining section 450 can be omitted. This means that the joining section 450 may only have the inclined surface 452. In this case, the first wire 51 is preferably attached with its inclined surface 452 to a section of the inclined surface 452 that is closer to the outer direction. The joining section 450 may have a further inclined surface in addition to the first inclined surface 452A and the second inclined surface 452B.

[0067] • In the above embodiment, the angle P2 of the inclined surface 452 of the joining section 450 may be smaller than the angle P1. • In the above embodiment, the inclined surface 452 of the joining section 450 may only have an inclined surface. Furthermore, the inclined surface may be a curved surface instead of a flat surface. In the above embodiment, the joining section 450 may not have an inclined surface 452 and may only include the horizontal surface 451.

[0068] • In the embodiment above, the end of the upper surface 21A on the side of the third negative direction Z2 may be located on the side of the third positive direction Z1 with respect to the end of the joining section 450 on the side of the third negative direction Z2. This means that the joining section 450 may protrude from the first flange section 20.

[0069] • In the above embodiment, the distance L2 in the direction along the first axis X from the end E1 of the inclined surface 452 in the third positive direction Z1 to the end E2 of the inclined surface 452 in the third negative direction Z2 can be less than or equal to the outer diameter L1 of the first wire 51.

[0070] • In the above embodiment, the maximum dimension W3 of the extension section 440 in the direction along the third axis Z can be greater than or equal to the maximum dimension W4 of the joining section 450 in the direction along the third axis Z.

[0071] • In the embodiment above, the joining section of the first metal connection 41 with the first flange section 20 is not limited to the example of the embodiment above. This means that the bonding section 410 can be attached to an inwardly facing surface, a surface facing in the direction of the second axis Y, etc., under the outer surfaces of the first flange section 20.

[0072] • In the above embodiment, the recess 412 in the coil component 10 can be omitted. In this case, the first metal connection 41 is attached to the first flange section 20, with the adhesive 60 being positioned at any point between them.

[0073] • In the above embodiment, the area of ​​the region of the recess 412 facing the outer end surface 20A, viewed in the direction of the third axis Z, can be less than or equal to the area of ​​the relative surface 411.

[0074] • In the above embodiment, the position of the recess 412 is not limited to the example of the above embodiment. This means that the end 432 of the recess 412 on the side of the first positive direction X1 can be located on the side of the first positive direction X1 with respect to the end of the bond section 410 in the first positive direction X1. The end 431 of the recess 412 on the side of the first negative direction X2 can be located on the side of the first positive direction X1, as seen from the central axis C.

[0075] • In the above embodiment, the dimension of the bond section 410 can be constant in the direction along the second axis Y. This means that the bond section 410 cannot be roughly divided into the wide section 410A and the narrow section 410B.

[0076] • In the embodiment above, the recess 412 cannot extend over the entire wide section 410A in the direction along the second axis Y. Likewise, the recess 412 cannot extend over the entire narrow section 410B in the direction along the second axis Y. The volume V1 of the portion of the recess 412 located in the wide section 410A can be less than or equal to the volume V2 of the portion of the recess 412 located in the narrow section 410B.

[0077] • In the above embodiment, the maximum dimension L3 of the recess 412 in the direction along the first axis X can be less than 1 / 2 of the maximum dimension L4 of the facing area P. • In the above embodiment, the adhesive 60 can be accommodated up to the end 432 of the recess 412 in the first positive direction X1. Furthermore, the adhesive 60 can extend to the relative surface 411 and the coupling section 420.

[0078] • In the above embodiment, the adhesive 60 can be contained in a part between the assembly section 430 and the preceding section 22. • In the above embodiment, the shortest distance W1 from the mounting section 430 to the upper end surface 22A can be less than or equal to the minimum dimension W2 of the mounting section 430 in the direction along the first axis X.

[0079] • In the above embodiment, the extension section 440 can be in point contact with the side surface 22B. If one of the outer surfaces of the extension section 440 faces the side surface 22B and the side surface 22B is a curved surface and the curvatures of the surfaces are different, the surfaces can be in point contact with each other. In the above embodiment, the extension section 440 can be in line contact with the side surface 22B at several positions.

[0080] • In the above embodiment, the extension section 440 may not be in contact with the side surface 22B. The extension section 440 may extend away from the side surface 22B if it moves in the direction of the first negative direction X2.

[0081] • In the above embodiment, the shape of extension section 440 is not limited to the example of the embodiment. In the embodiment described in Fig. In the example shown in Figure 8, the extension section 440, for instance, when viewed in the third negative direction Z2, has a section that extends towards the center of the projecting section 22 in the direction along the second axis Y when moving in the direction of the first negative direction X2. In particular, the extension section 440 of the first metal connection 41 has a section that extends in the second negative direction Y2 when moving in the direction of the first negative direction X2. This means that the extension section 440 is curved in a Z-shape. With such a shape, the extension section 440 easily comes into line contact with the side surface 22B of the first flange section 20. In the example shown in Figure 8, the extension section 440 is curved in a Z-shape. Fig. In the example shown in Figure 8, the end of the joining section 450 on the side of the third positive direction Z1 is separated from the upper surface 21A. Conversely, the end of the joining section 450 on the side of the third negative direction Z2 is in contact with the upper surface 21A. The joining section 450 is in line contact with the upper surface 21A. As in this example, in the configuration where part of the joining section 450 is in contact with the upper surface 21A, the first metal terminal 41 can be positioned with respect to the first flange section 20 in the direction along the first axis X. As in this example, in a case where the joining section 450 is inclined with respect to the third axis Z, a surface parallel to a surface of the joining section 450 on the side of the first negative direction X2 is defined as the horizontal surface 451.

[0082] The following describes technical ideas derived from the embodiments and modifications above. The coil components according to points [1], [2], [3], [4], [6] and [7] are not included in the claimed invention.

[0083] [1] Coil component comprising: a cylindrical core with a columnar winding core section, a first flange section connected to a first end of the winding core section in a direction along a central axis of the winding core section, and a second flange section connected to a second end of the winding core section opposite the first end;a first metal connection attached to the first flange section and a wire wound around the core section having a first connection end connected to the first metal connection, wherein an axis orthogonal to the central axis is defined as a first axis and one of the directions along the first axis is defined as a first positive direction, wherein the first flange section projects outwards in the first positive direction with respect to the core section, and wherein the first metal connection has: a bond section connected to the first flange section by an interposed adhesive; a mounting section located closest to the side of the first positive direction in the first metal connection;and a coupling section that connects the bonding section and the assembly section, and in which the assembly section is separated from the cylinder core on the side of the first positive direction.

[0084] [2] Coil component according to point [1], wherein the first flange section has an upper surface facing the side of the first positive direction and a projecting section projecting from the upper surface in the direction of the side of the first positive direction, wherein, if a direction opposite to the first positive direction is defined as a first negative direction and an axis orthogonal to both the central axis and the first axis is defined as a second axis, the projecting section has an upper end surface facing the mounting section from the side of the first negative direction and a side surface connecting the upper end surface and the upper surface and intersecting the second axis, and wherein the first metal terminal has an extension section extending from the mounting section and in contact with the side surface.

[0085] [3] Coil component according to point [1] or [2], wherein the first flange section has an upper surface facing the side of the first positive direction and a projecting section projecting from the upper surface in the direction of the side of the first positive direction, wherein, if a direction opposite to the first positive direction is defined as a first negative direction, the projecting section has an upper end surface facing the mounting section from the side of the first negative direction, and wherein a shortest distance from the mounting section to the upper end surface in the direction along the first axis is greater than a minimum dimension of the mounting section in the direction along the first axis.

[0086] [4] Coil component according to [2] or [3], wherein the first flange section has an upper surface facing the side of the first positive direction and a projecting section projecting from the upper surface towards the side of the first positive direction, wherein, if a direction opposite to the first positive direction is defined as a first negative direction and an axis orthogonal to both the central axis and the first axis is defined as a second axis, the projecting section has an upper end surface facing the mounting section from the side of the first negative direction and a side surface connecting the upper end surface and the upper surface and intersecting the second axis, wherein the first metal terminal has an extension section extending from the mounting section and in contact with the side surface,and where the extension section is in line contact or point contact with the side surface.

[0087] [5] Coil component according to one of points [2] to [4], wherein, if a direction opposite to the first positive direction is defined as a first negative direction, and an axis orthogonal to both the central axis and the first axis is defined as a second axis, the first flange section has a top surface facing the side of the first positive direction, and a projecting section projecting from the top surface in the direction of the side of the first positive direction, and the projecting section having a top end surface facing the mounting section from the side of the first negative direction, and a side surface connecting the top end surface and the top surface and intersecting the second axis, wherein the first metal terminal has an extension section extending from the mounting section and in contact with the side surface, and wherein the extension section,When viewed in the direction along the central axis, it has a section that extends in one direction towards the midpoint of the extension section in the direction along the second axis towards the first negative direction.

[0088] (6) Coil component according to one of points [1] to [5], wherein, if a direction from the first metal terminal to the winding core section in the direction along the central axis is defined as an inward direction, and a direction opposite to the inward direction is defined as an outward direction, the bond section is attached to a surface facing inward or to a surface facing outward below the outer surfaces of the first flange section.

[0089] [7] Coil component according to any of points [2] to [6], wherein the first flange section has an upper surface facing the side with the first positive direction and a projecting section projecting from the upper surface in the direction of the side with the first positive direction, wherein, if a direction opposite to the first positive direction is defined as a first negative direction and an axis orthogonal to both the central axis and the first axis is defined as a second axis, the projecting section has an upper end surface facing the mounting section from the side of the first negative direction and a side surface connecting the upper end surface and the upper surface and intersecting the second axis, wherein the first metal terminal has an extension section extending from the mounting section and in contact with the side surface,and wherein the first metal connection has a joining section extending from the extension section, facing the upper surface from the side of the first positive direction and in contact with the upper surface.< / modifizierung> < / erstreckungsabschnitt> < / montageabschnitt> < / kopplungsabschnitt> < / bondabschnitt> < / gesamtkonfiguration>

Claims

[1] Coil component (10) comprising: a cylindrical core (10C) with a columnar winding core section (11), a first flange section (20) connected to a first end of the winding core section (11) in a direction along a central axis (C) of the winding core section (11), and a second flange section (30) connected to a second end of the winding core section (11) opposite the first end; a first metal connection (41) attached to the first flange section (20); and a wire (51) which is wound around the winding core section (11) and has a first connecting end which is attached to the first metal terminal (41), where an axis orthogonal to the central axis (C) is defined as a first axis (X) and one of the directions along the first axis (X) is defined as a first positive direction (X1), wherein the first flange section (20) projects outwards in the first positive direction (X1) with respect to the winding core section (11), wherein the first metal connection (41) has: a bond section (410) attached to the first flange section (20), with an adhesive (60) arranged between them; a mounting section (430) located closest to one side of the first positive direction (X1) in the first metal terminal (41); and a coupling section connecting the bonding section (410) and the assembly section (430), and wherein the assembly section (430) is spaced from the cylinder core (10C) on the side of the first positive direction (X1), wherein the first flange section (20) has an upper surface (21A) facing the side of the first positive direction (X1) and a projecting section (22) extending from the upper surface (21A) in the direction of the side of the first positive direction (X1), wherein, where a direction opposite to the first positive direction (X1) is defined as a first negative direction (X2), and an axis orthogonal to both the central axis (C) and the first axis (X) is defined as a second axis (Y), the projecting section (22) has an upper end face (22A) facing the mounting section (430) from one side of the first negative direction (X2), and a side face (22B) connecting the upper end face (22A) of the projecting section (22) and the upper face (21A) of the first flange section (20) and intersecting the second axis (Y), and wherein the first metal connection (41) has an extension section (440) extending from the mounting section (430) and in contact with the side surface (22B), wherein the extension section (440), when viewed in the direction along the central axis (C), has a section extending towards a center of the protruding section (22) in the first negative direction (X2). [2] Coil component (10) according to claim 1, wherein the first flange section (20) has an upper surface (21A) facing the side of the first positive direction (X1) and a projecting section (22) extending from the upper surface (21A) in the direction of the side of the first positive direction (X1), wherein, if a direction opposite to the first positive direction (X1) is defined as a first negative direction (X2), the foreground section (22) has an upper end face (22A) facing the assembly section (430) from a side of the first negative direction (X2), and wherein a shortest distance from the mounting section (430) to the upper end face (22A) of the projecting section (22) in the direction along the first axis (X) is greater than a minimum dimension of the mounting section (430) in the direction along the first axis (X). [3] Coil component (10) according to one of the preceding claims, wherein the extension section (440) is in line contact or point contact with the side surface (22B). [4] Coil component (10) according to one of the preceding claims, wherein, if a direction from the first metal terminal (41) towards the winding core section (11) in the direction along the central axis (C) is defined as an inward direction and a direction opposite to the inward direction is defined as an outward direction, the bond section (410) of the first metal terminal (41) is attached under outer surfaces of the first flange section (20) to a surface that points in the inward direction or a surface that points in the outward direction. [5] Coil component (10) according to one of the preceding claims, wherein the first metal connection (41) has a joining section (450) extending from the extension section (440), facing the upper surface (21A) of the first flange section (20) from the side of the first positive direction (X1) and in contact with the upper surface (21A) of the first flange section (20).

Images