COIL COMPONENT

Abstract

Coil component (10) comprising: a cylindrical core (10C) with a columnar winding core section (11), a first flange section connected to a first end of the winding core section (11) in a direction along a central axis of the winding core section (11), and a second flange section connected to a second end of the winding core section (11) opposite the first end; a first metal terminal (41) attached to the first flange section (20); and a wire wound around the winding core section (11) having a first connecting end connected to the first metal terminal (41), wherein the first flange section (20) projects outwards in a first positive direction orthogonal to the central axis with respect to the winding core section (11).if a direction from the first metal terminal (41) towards the winding core section (11) in a direction along the central axis is an inward direction, a direction opposite to the inward direction is an outward direction, and a direction opposite to the first positive direction is a first negative direction, the first metal terminal (41) has a connecting section (450) facing a surface of the first flange section (20) facing the first positive direction, a first connecting end of the wire is connected to a connecting surface of the connecting section (450) facing the first positive direction, the connecting section (450) has an inclined surface that is inclined along the inward direction at the connecting surface facing the first positive direction towards the first negative direction,where the inclined surface reaches an end of the connecting section (450) in the inward direction, and viewed in a direction perpendicular to both the first positive direction and the inward direction, an acute angle defined by a virtual straight line parallel to the central axis and a tangent at an end of the inclined surface in the inward direction is greater than an acute angle defined by the virtual straight line and a tangent at an end of the inclined surface in the outward direction, wherein the first flange section (20) has an upper surface (21A) facing the connecting section (450), the upper surface (21A) being on one side of the first negative direction with respect to the connecting section (450).and wherein one end of the upper surface is located further inwards in the inward direction with respect to one end of the connecting section in the inward direction.

Description

BACKGROUND OF THE INVENTION 1. AREA OF INVENTION The present disclosure relates to a coil component. 2. DESCRIPTION OF THE STATE OF THE ART The coil component described in JP 2019-121692A comprises a core section and two flange sections. The core section is in the shape of a rectangular prism. The two flange sections are connected to both ends of the core section. Each flange section projects outwards from the core section in a direction orthogonal to its central axis. The core section and the flange sections are made of a magnetic material. The core section and the flange sections together form the core of the coil component. The coil component has multiple metal terminals and two wires. If a direction orthogonal to the central axis of the core section is a width direction, each metal terminal is attached to one end of each flange section in the width direction. Each wire is wound around the core section. An end segment of each wire is pulled out of the core section and joined or bonded to the metal terminal by thermal compression. As a result, the thermally compressed section of wire is crimped and flattened. Furthermore, JP 2007-103 596 A discloses a coil component whose winding core is supported by means of two flange sections, wherein a metal connection to the winding wire is arranged on one of the flange faces and has an inwardly inclined bracket. Furthermore, DE 20 2019 106 032 U1 discloses a coil component whose winding core is also supported by two end-face flange sections, wherein the winding wire is guided to a terminal electrode on a top surface of the flange sections, the said top surface having a curved, contoured contact surface sloping inwards towards the winding core in the area of ​​the terminal electrode. Further coil components are known from the publications JP 2021 - 57 444 A , JP 2020 - 120 089 A , JP 2014 - 99 587 A , US 2020 / 0 211 750 A1 and DE 10 2019 212 672 A1. PRESENTATION OF THE INVENTION In the coil component described in JP 2019-121692A, the wire is bent at a section that extends from the end section to the core section. If the wire is bent quickly at a particular section, a break in the connection can occur at that bent section. To solve the above problems, the present invention provides a coil component comprising, among other things: 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 the first flange section projects outwards in a first positive direction orthogonal to the central axis with respect to the winding core section, and wherein the first metal terminal has a connecting section facing a surface of the first flange section.which faces the side of the first positive direction, wherein a first connecting end of the wire is connected to a surface of the connecting section which faces the side of the first positive direction, wherein, if a direction from the first metal terminal towards the winding core section in a direction along the central axis is defined as an inward direction, a direction opposite to the inward direction is defined as an outward direction, and a direction opposite to the first positive direction is defined as a first negative direction, the connecting section has an inclined surface which is arranged in the first negative direction in the direction of the inner direction on a surface which faces the side of the first positive direction, wherein the inclined surface reaches an end of the connecting section on the side of the inner direction, and wherein,When viewed in a direction orthogonal to both the first positive direction and the inward direction, an acute angle formed by a virtual straight line parallel to the central axis and a tangent at one end of the inclined surface in the inward direction is greater than an acute angle formed by the virtual straight line and a tangent at one end of the inclined surface in the outward direction. According to the configuration above, the inclined surface of the first metal terminal is gradually or continuously inclined as it extends inwards. With such an inclined surface, the wire, when placed along it, will not bend sharply at any specific point. Therefore, breakage at the bent section of the wire can be prevented. According to one aspect of the present disclosure, the interruption of the wire can be prevented. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 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. 4 is a perspective view of the area surrounding a first metal terminal in the coil component; Fig. 5 is a front view of the area surrounding the first metal terminal in the coil component; Fig. 6 is a front view of the first metal terminal in the coil component; Fig. 7 is a view showing part of an end view along line 7-7 in Fig. 2; and Fig. 8 is a view illustrating a modification of a connection section of a coil component. DETAILED DESCRIPTION OF THE INVENTION The following describes an embodiment of a coil component. The drawings may show enlarged components for clarity. The dimensions of the components may differ from the actual dimensions or from those shown in another drawing. <gesamtkonfiguration> As shown in Fig. 1, a coil component 10 comprises a cylindrical core 10C and a cover plate 12. The cylindrical core 10C comprises a winding core section 11, a first flange section 20 and a second flange section 30. 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. In particular, the material of the winding core section 11 can be, for example, aluminum oxide, Ni-Zn-based ferrite, resin, a mixture thereof, or the like. The first flange section 20 is connected to a first end of the winding core section 11 in one direction along a central axis C. The second flange section 30 is connected 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 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. In this embodiment, a specific axis orthogonal to the central axis C is defined as a first axis X. The first axis X is parallel to two of the four sides of the winding core section 11, 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 a second axis Y. 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. Similarly, 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. 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 below the outer surfaces of the first flange section 20. The first flange section 20 comprises a main body section 21 and a projecting section 22. The main body section 21 has the shape of a quadrilateral prism, which 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 corresponding to 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 corresponding to 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 corresponding to the first positive direction X1. 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 a quadrilateral truncated cone shape, the dimension of which decreases in the direction along the second axis Y in the direction of 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. 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 first positive direction X1 below 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 integrally formed. That is, there is no clear boundary between the main body section 21 and the projecting section 22 within the first flange section 20. 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. That is, 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 comprises 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. That is, the main body section 31 has an upper surface 31A that faces the first positive direction X1.The preceding section 32 has an upper end face 32A and two side faces 32B. In the present embodiment, the maximum dimension of the cylindrical core 10C in the direction along the first axis X is 1.4 mm. The maximum dimension of the cylindrical core 10C in the direction along the second axis Y is 2.5 mm. The maximum dimension of the cylindrical core 10C in the direction along the third axis Z is 3.2 mm. The upper plate 12 has a rectangular shape. The upper plate 12 is flat in the direction along 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 the first negative direction X2, and the surface of the second flange section 30, which also faces the first negative direction X2. That is, 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. The coil component 10 comprises a first metal terminal 41, a second metal terminal 42, a third metal terminal 43 and a fourth metal terminal 44. 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. As shown in Fig. 2, the coil component 10 comprises a first wire 51 and a second wire 52. Although not shown, the first wire 51 comprises 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. A first connection end of the first wire 51 is connected 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 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 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. Thermocompression bonding is a process in which a wire is clamped between a metal terminal and a heated device and fixed to the metal terminal by melting the wire. As a result of this bonding method, the insulating foil near the connection point with the metal terminal is detached from the wire, exposing the copper wire. The second wire 52 has the same configuration as the first wire 51. That is, the second wire 52 comprises copper wire and an insulating layer. The outer diameter L1 of the second wire 52 is approximately 50 µm. A first connection end of the second wire 52 is connected to the second metal terminal 42 by thermocompression bonding. The second wire 52 extends from the second metal terminal 42 towards the crest line of the winding core section 11 on the side of the first positive direction X1 and 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 crest line of the winding core section 11 on the side of the first negative direction X2 and the second negative direction Y2 towards the fourth metal terminal 44. The second connection end of the second wire 52 is connected to the fourth metal terminal 44 by thermocompression bonding. <Erste Metallanschluss> As shown in Fig. 6, the first metal connection 41 comprises a bonding section 410, a coupling section 420, an assembly section 430, an extension section 440, and a connecting section 450. The bonding section 410, the coupling section 420, the assembly section 430, the extension section 440, and the connecting section 450 are formed in one piece or integrally. That is, there is no clear boundary between these parts within the first metal connection 41. 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 from 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. <bonding-abschnitt> As shown in Fig. 1, the bonding section 410 is essentially in the form of a plate. As shown in Fig. 7, the bonding section 410 is attached to the outer end face 20A of the first flange section 20 by means of an interposed adhesive 60. That is, the bonding section 410 is connected to a surface facing the third positive direction Z1 under 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. As shown in Fig. 6, the bonding section 410 has a relative surface 411 and a recess 412. As shown in Fig. 7, the relative surface 411 is a surface facing the outer end surface 20A from the side of the third positive direction Z1, with the exception of the recess 412. In other words, the relative surface 411 of the first metal terminal 41 is a surface facing the third negative direction Z2. As shown in Fig. 6, the bonding section 410 comprises a wide section 410A and a narrow section 410B. The wide section 410A is a portion that encloses one end of the bonding 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 area 411 and the recess 412. The narrow section 410B borders the wide section 410A on the side of the first positive direction X1. Specifically, 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. In Fig. 6, a boundary between the narrow section 410B and the wide section 410A is virtually represented by a dashed line. The narrow section 410B has a smaller dimension than the wide section 410A in the direction along the second axis Y. The dimension of the narrow section 410B in the direction along the second axis Y is 1 / 2 or less than the dimension of the wide section 410A in the direction along the second axis Y. The dimension of the narrow section 410B in the direction along the second axis Y is essentially constant, except for a coupling section with the wide section 410A. As shown in Fig. 7, the recess 412 is set back from the relative surface 411. The adhesive 60 is contained in the recess 412. However, the adhesive 60 is not contained in a portion of the recess 412 that encloses an end in the first positive direction X1. As shown in Fig. 6, the recess 412 extends over both 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 bonding section 410 in the first negative direction X2. That is, the recess 412 is not open towards the end of the bonding section 410 in the first negative direction X2. As shown in Fig. 7, the end 431 of the recess 412 on the side of the first negative direction X2 is located on the side of the first negative direction X2, viewed from the central axis C. One 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 with respect to the end of the bonding section 410 in the first positive direction X1. That is, 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, viewed from the upper end face 22A of the first flange section 20. As shown in Fig. 7, the end 432 of the recess 412 on the first side in the positive direction X1 is located on the first side in the positive direction X1, viewed from the end of the winding core section 11 on the first side in the positive direction X1. As shown in Fig. 6, the recess 412 of the narrow section 410B extends over the entire narrow section 410B in the direction along the second axis Y. Furthermore, the recess 412 of the wide section 410A extends over the entire wide section 410A in the direction along the second axis Y. That is, the maximum dimension of the recess 412 in the direction along the second axis Y, which is located in the wide section 410A, is larger than the maximum dimension of the narrow section 410B in the direction along the second axis. The edge of the recess 412 on the first negative direction X2 side is essentially parallel to the second axis Y. The edge of the recess 412 on the first positive direction X1 side is also essentially parallel to the second axis Y. The distance from the edge of the recess 412 on the first negative direction X2 side 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. That is, 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. The dimension of the recess 412 in the direction of 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, and reflects the difference in area described above. As shown in Fig. 7, an area in which the relative surface 411 and the recess 412 are combined, i.e., an area of ​​the first metal connection 41 facing the outer end surface 20A of the first flange section 20, is defined as an facing area P. As shown in Fig. 6, the area of ​​the recess 412 facing the outer end face 20A of the first flange section 20, viewed along the central axis C, is half or more than the area of ​​the facing region P. That is, the area of ​​the recess 412 facing the outer end face 20A of the first flange section 20 is equal to or greater than the area of ​​the relative surface 411. Furthermore, as shown in Fig. 7, the maximum dimension L3 of the recess 412 along the first axis X is 1 / 2 or more than the maximum dimension L4 of the facing region P 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 detected and includes a case where it is viewed while being transmitted as described above. <kopplungsabschnitt> As shown in Fig. 7, the coupling section 420 is connected to one end of the bonding section 410 in the first positive direction X1. In Fig. 6, the boundary between the coupling section 420 and the bonding section 410 is virtually represented by a dashed line. The coupling section 420 extends from the bonding section 410 in the first positive direction X1. That is, the coupling section 420 projects from the first flange section 20 in the direction along the first axis X, viewed in the direction along the third axis Z. In particular, the coupling section 420 projects in the direction of the first positive direction X1 with respect to the upper end face 22A of the first flange section 20. Coupling section 420 is bent by approximately 90 degrees on its way there. One end of coupling section 420, opposite bonding section 410, faces the third negative direction Z2. <montageabschnitt> As shown in Fig. 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 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. That is, 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. As shown in Fig. 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. <Verlängerungsabschnitt> As shown in Fig. 4, the extension section 440 is connected to one end of the mounting section 430 on the side of the second positive direction Y1. The extension section 440 extends substantially obliquely from the mounting section 430 in the direction of the second positive direction Y1 and 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. 5, the extension section 440 extends in the direction of the third axis Z such that, as it moves in the first negative direction X2, it approaches the side surface 22B of the projecting section 22 that faces the second positive direction Y1. The surface of the extension section 440 facing the second negative direction Y2 is in line contact with the side surface 22B of the projecting 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. In particular, as shown in Fig. 5, 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 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. <verbindungsabschnitt> As shown in Fig. 4, the connecting section 450 is connected to one end of the extension section 440 on the side of the first negative direction X2. The connecting section 450 is essentially plate-shaped. It is elongated in the direction of the third axis Z when viewed along the first axis X. As shown in Fig. 3, the maximum dimension W4 of the connecting section 450 along the third axis Z is greater than the maximum dimension W3 of the extension section 440 along the third axis Z, i.e., the width dimension of the extension section 440. As shown in Fig. 4, the connecting 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 connecting section 450 facing the first negative direction X2 is in contact with the upper surface 21A. However, the surface of the connecting section 450 facing the first negative direction X2 is not attached to the upper surface 21A. That is, the adhesive 60 and the like are not arranged between the surface of the connecting section 450 facing the first negative direction X2 and the upper surface 21A. Viewed in the direction along the first axis X, the connecting section 450 does not protrude from the upper surface 21A of the first flange section 20 in the third negative direction Z2. That is, 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 connecting section 450 on the side of the third negative direction Z2. The connecting 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 connecting section 450. Viewed in the direction along the first axis X, the horizontal surface 451 has a substantially rectangular shape. 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 first side in the positive direction X1 and the third side in the negative direction Z2. The horizontal surface 451 adjoins the first inclined surface 452A on the side of the third positive direction Z1. The first inclined surface 452A is located in the first negative direction X2 in the direction of the third negative direction Z2. The second inclined surface 452B is a flat surface facing the first side in the positive direction X1 and the third side in the 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 in the direction of the third negative direction Z2. The second inclined surface 452B reaches one end of the connecting section 450 on the side of the third negative direction Z2. As shown in Fig. 3, when viewed along the second axis Y, the virtual 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 virtual line VL1 is defined as angle P1. Viewed along the second axis Y, the virtual 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 virtual line VL2 is defined as angle P2. At this point, angle P2 is larger than angle P1. 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 corresponding to 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 corresponding to the third negative direction Z2 is a line that runs along the second inclined surface 452B. 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. That is, 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> As illustrated in Fig. 1, the second metal connection 42 has a shape that is reversed along the second axis Y with respect to the first metal connection 41. 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 bonding 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 bonding 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 bonding section 410. <Wirkungen von vorliegenden Ausführungsform> When the first wire 51 is connected to the connecting section 450, the first end of the first wire 51 is positioned on the horizontal surface 451, and a device is pressed parallel to the horizontal surface 451. This device is a heating element. The device is in contact with the first wire 51 on the horizontal surface 451 and with a portion of the first wire 51 on the side of the third positive direction Z1 on the first inclined surface 452A. When the first wire 51 comes into contact with the device, the insulating layer in the first wire 51 melts. That is, the entire first wire 51 on the horizontal surface 451 and the 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, the first wire 51 on the horizontal surface 451 is compressed and flattened by the load of the device during bonding by thermal compression. 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. During bonding by thermal compression, 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 layer remains intact. Since the first wire 51 on the second inclined surface 452B does not come into contact with the device, it is also not flat. <Wirkungen der vorliegenden Ausführungsform> The effects of the present embodiment are described below. The effects of the first wire 51 and the first metal terminal 41 are described below by way of example, but the same effects are achieved at a connecting section between each wire and each metal terminal. (1) According to the above embodiment, the inclined surface 452 of the first metal terminal 41 is gradually inclined inwards. In particular, the angle P2 in the inclined surface 452 is greater than the angle P1. With such an inclined surface 452, the first wire 51, when placed along the inclined surface 452, is bent in two steps. That is, the first wire 51 is not bent rapidly at a particular section.While the first wire 51 of the first metal terminal 41 is not strongly bent, the section of the first wire 51 not located at the first metal terminal 41 is rapidly bent from the upper surface 21A towards the winding core section 11. By preventing the bending of the first wire 51 at the first metal terminal 41, which is bonded by thermal compression so that it is exposed as in the configuration above, the separation of the first wire 51 can be prevented. (2) According to the embodiment above, when the first wire 51 is connected to the connecting section 450 of the first metal terminal 41 by crimping, the first wire 51 is not strongly compressed at the end E2 of the second inclined surface 452B on the inward-facing side. Therefore, after the first wire 51 is connected, it is not excessively thin at the end E2 of the second inclined surface 452B on the inward-facing side.Therefore, if the first wire 51 is bent at the end E2 of the second inclined surface 452B on the inward-facing side, it can be prevented that the first wire 51 is separated at that section.(3) According to the above embodiment, the first wire 51 extends along the horizontal surface 451 with substantially the same thickness by pressing the device parallel to the horizontal surface 451 to join the first wire 51. Since the joining area between the first wire 51 and the first metal terminal 41 can be enlarged, the strength required as the joining strength of the first wire 51 can be ensured.(4) According to the above embodiment, the end of the upper surface 21A of the first flange section 20 is located in the third negative direction Z2 on the side of the third negative direction Z2 with respect to the end of the joining section 450 in the third negative direction Z2.Therefore, the first wire 51, as shown in Fig. 3, can be in contact with the end of the upper surface 21A of the first flange section 20 in the inward direction. When the first wire 51 comes into contact with the end of the upper surface 21A in the inward direction, the first wire 51 is also bent at the contact section. That is, according to the above configuration, the number of sections in which the first wire 51 can be bent can be increased by one. If the number of sections in which the first wire 51 can be bent increases, the bend angle of the first wire 51 can be distributed across a plurality of sections, thus preventing the first wire 51 from being bent rapidly in any one section. (5) In the above embodiment, the mounting section 430 comes into contact with the substrate when the coil component 10 is attached to the substrate.According to the embodiment described above, the maximum dimension W3 of the extension section 440 in the direction along the third axis Z is smaller than the maximum dimension W4 of the connection section 450 in the direction along the third axis Z. Therefore, for example, impacts when the mounting section 430 is attached to a substrate or the like can be absorbed by deformation of the extension section 440. Thus, the impact transmitted from the mounting section 430 to the connection section 450 can be attenuated. Therefore, it is possible to prevent the first wire 51 from detaching from the connection section 450 due to the impact from the mounting section 430. <modifikation> The present embodiment can be modified as follows. The present embodiment and the following modifications can be combined within a range that is not technically contradictory. A modification that applies to the first metal connection 41 up to the fourth metal connection 44 is described by way of example only for the first metal connection 41. In the above embodiment, the configuration of the coil component 10 is not restricted. For example, the upper plate 12 of 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. In the embodiment described above, 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. In the above embodiment, the winding core section 11 cannot have the shape of a quadrilateral prism. For example, the cross-sectional shape of the winding core section 11 can be circular, elliptical, or polygonal, but not quadrilateral. 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 a connecting section 450 which faces the upper surface 21A of the first flange section 20, which points in the first positive direction X1. In the above embodiment, the connecting section 450 can be separated from the upper surface 21A. Furthermore, the adhesive 60 can be located between the connecting section 450 and the upper surface 21A. In the embodiment described above, there can be no clear boundary between the first inclined surface 452A and the second inclined surface 452B in the connecting section 450. That is, the inclined surface 452 can be designed such that the angle of inclination changes gently. An acute angle formed by the inclined surface 452 at end E1 of the inclined surface 452 on the side of the third positive direction Z1 and the virtual line VL1 is defined as angle P1. An acute angle formed by the inclined surface 452 at end E2 of the inclined surface 452 on the side of the third negative direction Z2 and the virtual line VL2 is defined as angle P2. In this case as well, angle P2 is larger than angle P1. It should be noted that the inclined surface 452 can only have one inclined surface.In this case, a part enclosing the inner end E2 of the inclined surface 452 may be a curved surface, and as a result, the angle P2 may be larger than the angle P1. In the embodiment described above, the configuration of the connecting section 450 is not limited to the example shown above. In the example shown in Fig. 8, for instance, the connecting section 450 has a first horizontal surface 451A and a second horizontal surface 451B. The first horizontal surface 451A is the surface closest to the third positive direction Z1 among the outer surfaces of the connecting section 450. The first horizontal surface 451A points in the first positive direction X1. Viewed in the direction along the first axis X, the first horizontal surface 451A has a substantially rectangular shape. The second horizontal surface 451B adjoins the first horizontal surface 451A on the side of the third negative direction Z2. The second horizontal surface 451B is located on the side of the first negative direction X2 with respect to the first horizontal surface 451A.This creates a step between the first horizontal surface 451A and the second horizontal surface 451B. The first wire 51 is bonded to the first horizontal surface 451A by thermocompression. In the example shown in Fig. 8, the connecting section 450 has the inclined surface 452, which includes the first inclined surface 452A and the second inclined surface 452B as in the embodiment above. According to this configuration, the first wire 51 is connected to the second horizontal surface 451B and the inclined surface 452 on the side of the first positive direction X1. Therefore, the first wire 51 is hardly affected by thermocompression bonding to the second horizontal surface 451B and the inclined surface 452.Therefore, the first wire 51 at the end E2 of the second inclined surface 452B is not strongly squeezed on the inwardly facing side, and the first wire 51 is hardly separated or detached. In the embodiment described above, the horizontal surface 451 in the connecting section 450 can be omitted. That is, the connecting section 450 can comprise only the inclined surface 452. In this case, the first wire 51 is preferably connected to the inclined surface 452 at a section of the inclined surface 452 that is closer to the outer direction. In addition to the first inclined surface 452A and the second inclined surface 452B, the connecting section 450 can have a further inclined surface. In the embodiment above, the end of the upper surface 21A can be located on the side of the third negative direction Z2 or on the side of the third positive direction Z1 with respect to the end of the connecting section 450 on the side of the third negative direction Z2. That is, the connecting section 450 can project beyond the first flange section 20. 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. 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 connecting section 450 in the direction along the third axis Z. In the above embodiment, the recess 412 in the coil component 10 can be omitted. In this case, the first metal connection 41 is connected to the first flange section 20, with the adhesive 60 being positioned at any point between them. In the above embodiment, the area of ​​the region of the recess 412, which faces the outer end surface 20A, can be less than or equal to the area of ​​the corresponding surface 411 when viewed in the direction of the third axis Z. In the embodiment described above, the position of the recess 412 is not limited to the example shown above. That is, 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 connecting 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 when viewed from the central axis C. In the embodiment above, the dimension of the adhesive section 410 can be constant in the direction along the second axis Y. That is, the adhesive section 410 does not need to be roughly divided into the wide section 410A and the narrow section 410B. In the embodiment above, the recess 412 need not extend over the entire wide section 410A in the direction along the second axis Y. Likewise, the recess 412 need not 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. In the above embodiment, the maximum dimension L3 of the recess 412 in the direction along the first axis X can be less than or equal to 1 / 2 of the maximum dimension L4 of the opposite area P. In the embodiment above, the adhesive 60 can be received up to the end 432 of the recess 412 in the first positive direction X1. Furthermore, the adhesive 60 can reach the corresponding surface 411 and the coupling section 420. In the above embodiment, the mounting section 430 can be in contact with the upper end surface 22A of the projecting section 22. That is, the mounting section 430 can be in contact with the outer surface of the cylindrical core 10C. Furthermore, the adhesive 60 can be applied between the mounting section 430 and the projecting 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. In the above embodiment, the extension section 440 need not be in contact with the side surface 22B. The extension section 440 can extend away from the side surface 22B if it moves in the direction of the first negative direction X2. The following describes technical ideas that can be derived from the embodiments and modifications above.[1] An unclaimed coil component comprises: 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 the first flange section projects outwards in a first positive direction orthogonal to the central axis with respect to the winding core section, and wherein the first metal terminal has a connecting section.which is opposite a surface of the first flange section that is opposite the first positive direction, wherein a first connecting end of the wire is connected to a surface of the connecting section that faces a side of the first positive direction, wherein if a direction from the first metal connection towards the winding core section in a direction along the central axis is defined as an inward direction, a direction opposite to the inward direction is defined as an outward direction, and a direction opposite to the first positive direction is defined as a first negative direction, wherein the connecting section has an inclined surface that is arranged in the first negative direction in the direction of the inward direction on a surface facing the side of the first positive direction,wherein the inclined surface reaches an end of the connecting section on one side of the inward direction, and wherein, viewed in a direction orthogonal to both the first positive direction and the inward direction, an acute angle formed by a virtual straight line parallel to the central axis and a tangent at an end of the inclined surface in the inward direction is greater than an acute angle formed by the virtual straight line and a tangent at an end of the inclined surface in the outward direction.[2] The coil component according to [1], wherein the inclined surface has a first inclined surface and a second inclined surface adjacent to the first inclined surface on the side of the inward direction.[3] The coil component according to [1] or [2],wherein a distance in the first positive direction from the end of the inclined surface in the inward direction to the end of the inclined surface in the outward direction is greater than an outside diameter of the wire.[4] The coil component according to any one of points [1] to [3], wherein the connecting section has a horizontal surface adjacent to the inclined surface in the outward direction and orthogonal to the first positive direction, and wherein the wire is connected to the horizontal surface.[5] The coil component according to any one of points [1] to [4], wherein, as claimed, the first flange section is arranged on one side of the first negative direction with respect to the connecting section and has an upper surface facing the connecting section,and wherein, as claimed, an end of the upper surface is arranged in the inward direction with respect to an end of the connecting section in the inward direction.(6) The coil assembly according to any one of points [1] to [5], wherein the first metal terminal has a mounting section that is closest to the side of the first positive direction in the first metal terminal, and an extension section that extends from the connecting section in the direction of the side of the first positive direction and is connected to the mounting section, and wherein a maximum dimension of the extension section in the direction along the central axis is smaller than a maximum dimension of the connecting section in the direction along the central axis.[7] The coil assembly according to any one of points [1] to [6] further comprises: a second metal terminal that is attached to the first flange section; a third metal terminal,which is attached to the second flange section; a fourth metal connection attached to the second flange section; and a second wire wound around the core section and having a first connection end connected to the second metal connection, where the wire is defined as a first wire, where a specific axis orthogonal to the central axis is defined as a first axis, and an axis orthogonal to both the central axis and the first axis is defined as a second axis, and one of the directions along the second axis is a second positive direction, and a direction opposite to the second positive direction is a second negative direction, wherein the second flange section projects outward in the first positive direction orthogonal to the central axis with respect to the core section.wherein the first metal connection is arranged on one side of the second positive direction with respect to a center of the first flange section in a direction along the second axis, wherein the second metal connection is arranged on one side of the second negative direction with respect to a center of the first flange section in the direction along the second axis, wherein the third metal connection is arranged on the side of the second positive direction with respect to a center of the second flange section in the direction along the second axis, wherein the fourth metal connection is arranged on the side of the second negative direction with respect to the center of the second flange section in the direction along the second axis, wherein a second connecting end of the first wire is connected to the third metal connection opposite the first connecting end,and wherein a second connecting end of the second wire is connected to the fourth metal terminal opposite the first connecting end.< / modifikation> < / verbindungsabschnitt> < / montageabschnitt> < / kopplungsabschnitt> < / gesamtkonfiguration>

Claims

Coil component (10) comprising: a cylindrical core (10C) with a columnar winding core section (11), a first flange section connected to a first end of the winding core section (11) in a direction along a central axis of the winding core section (11), and a second flange section connected to a second end of the winding core section (11) opposite the first end; a first metal terminal (41) attached to the first flange section (20); and a wire wound around the winding core section (11) having a first connecting end connected to the first metal terminal (41), wherein the first flange section (20) projects outwards in a first positive direction orthogonal to the central axis with respect to the winding core section (11).if a direction from the first metal terminal (41) towards the winding core section (11) in a direction along the central axis is an inward direction, a direction opposite to the inward direction is an outward direction, and a direction opposite to the first positive direction is a first negative direction, the first metal terminal (41) has a connecting section (450) facing a surface of the first flange section (20) facing the first positive direction, a first connecting end of the wire is connected to a connecting surface of the connecting section (450) facing the first positive direction, the connecting section (450) has an inclined surface that is inclined along the inward direction at the connecting surface facing the first positive direction towards the first negative direction,where the inclined surface reaches an end of the connecting section (450) in the inward direction, and viewed in a direction perpendicular to both the first positive direction and the inward direction, an acute angle defined by a virtual straight line parallel to the central axis and a tangent at an end of the inclined surface in the inward direction is greater than an acute angle defined by the virtual straight line and a tangent at an end of the inclined surface in the outward direction, wherein the first flange section (20) has an upper surface (21A) facing the connecting section (450), the upper surface (21A) being on one side of the first negative direction with respect to the connecting section (450).and wherein one end of the upper surface is located further inwards in the inward direction with respect to one end of the connecting section in the inward direction. Coil component (10) according to claim 1, wherein the inclined surface has a first inclined surface and a second inclined surface which adjoins the first inclined surface on the side of the inward direction. Coil component (10) according to claim 1 or 2, wherein a distance in the first positive direction from the end of the inclined surface in the inward direction to the end of the inclined surface in the outward direction is greater than an outer diameter of the wire. Coil component (10) according to one of the preceding claims, wherein the connecting section (450) has a horizontal surface which adjoins the inclined surface in the outward direction and is orthogonal to the first positive direction, and wherein the wire is connected to the horizontal surface. Coil component (10) according to one of the preceding claims, wherein the first metal terminal (41) further comprises: a mounting section (430) located closest to the side of the first positive direction in the first metal terminal (41), and an extension section extending from the connecting section (450) in the first positive direction and connected to the mounting section (430), wherein a maximum dimension of the extension section in the direction along the central axis is smaller than a maximum dimension of the connecting section (450) in the direction along the central axis. Coil component (10) according to one of the preceding claims, further comprising: a second metal terminal (42) attached to the first flange section (20); a third metal terminal (43) attached to the second flange section (30); a fourth metal terminal (44) attached to the second flange section (30); and, if the wire is defined as a first wire (51), a second wire (52) wound around the core section (11) and having a first connecting end connected to the second metal terminal (42), wherein, if a certain axis orthogonal to the central axis is defined as a first axis, and an axis orthogonal to both the central axis and the first axis is defined as a second axis,and one of the directions along the second axis is a second positive direction and one direction opposite to the second positive direction is a second negative direction, the second flange section (30) projects outwards orthogonally to the central axis in the first positive direction with respect to the winding core section (11), the first metal connection (41) is located on one side of the second positive direction with respect to a center of the first flange section in a direction along the second axis, the second metal connection (42) is located on one side of the second negative direction with respect to a center of the first flange section in the direction along the second axis, the third metal connection (43) is located on the side of the second positive direction with respect to a center of the second flange section in the direction along the second axis,the fourth metal terminal (44) is located on the side of the second negative direction with respect to the center of the second flange section in the direction along the second axis, a second connecting end of the first wire, opposite the first connecting end, is connected to the third metal terminal (43), and a second connecting end of the second wire, opposite the first connecting end, is connected to the fourth metal terminal (44).

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