Multilayer coil component

Abstract

To provide a multilayer coil component that suppresses the reduction in Q value.SOLUTION: A multilayer coil component 1 includes an element body 2, a coil 3 disposed within the element body 2, external electrodes 41 and 42 disposed on the surface of the element body 2, and connecting conductors 51 and 52 disposed within the element body 2. The coil 3 includes multiple coil conductors 30 arranged in one direction. The external electrodes 41 and 42 are adjacent to the coil 3 in a direction perpendicular to direction D1. The connecting conductors 51 and 52 electrically connect the coil 3 to the external electrodes 41 and 42. The multiple coil conductors 30 include end-most coil conductors 31 and 37 that include the ends of the coil 3 and are physically connected to the connecting conductors 51 and 52. The connecting conductors 51 and 52 have a thickness greater than the thickness of the thinnest portion of the coil 3.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a laminated coil component. [Background technology]

[0002] A laminated coil component is known that includes an element body, a coil disposed within the element body, external electrodes disposed on the surface of the element body, and connecting conductors that electrically connect the coil and the external electrodes (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-113309 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of one aspect of the present invention is to provide a laminated coil component that suppresses a decrease in the Q value. [Means for solving the problem]

[0005] A laminated coil component according to one aspect of the present invention comprises an element body, a coil disposed within the element body, external electrodes disposed on the surface of the element body, and connecting conductors disposed within the element body. The coil includes multiple coil conductors arranged in one direction. The external electrodes are adjacent to the coil in a direction perpendicular to the one direction. The connecting conductors electrically connect the coil and the external electrodes. The multiple coil conductors include an endmost coil conductor that includes an end of the coil and is physically connected to the connecting conductor. The connecting conductor has a thickness greater than the thickness of the thinnest portion of the coil.

[0006] The Q value of a multilayer coil component is inversely proportional to its electrical resistance. The electrical resistance of a multilayer coil component in which connecting conductors electrically connect a coil and external electrodes depends on the combined resistance of the coil and connecting conductors. Because the electrical resistance of a conductor is inversely proportional to the cross-sectional area of ​​the conductor, the electrical resistance of the connecting conductor changes depending on the thickness of the connecting conductor. Therefore, the Q value of a multilayer coil component changes depending on the thickness of the connecting conductor.

[0007] Multilayer coil components require multiple inductance values ​​for a given external size. The inductance value is inversely proportional to the magnetic path length. Since the magnetic path length depends on the thickness of each of the multiple coil conductors that make up the coil, it is difficult to determine a constant coil thickness. In order to obtain a multilayer coil component with a high inductance value, the magnetic path length may be reduced by reducing the thickness of the coil conductor. Reducing the thickness of the coil conductor reduces the cross-sectional area of ​​the coil conductor, which increases the electrical resistance of the multilayer coil component. Therefore, a multilayer coil component with a high inductance value tends to have a lower Q value. In a multilayer coil component, the thickness of the connecting conductors has little effect on the magnetic path length, and therefore the thickness of the connecting conductors is unlikely to affect the inductance value. Increasing the thickness of the connecting conductors increases the cross-sectional area of ​​the connecting conductors, thereby reducing the electrical resistance of the multilayer coil component. Therefore, by increasing only the thickness of the connecting conductors, it is possible to provide a multilayer coil component that has a high inductance value while suppressing a decrease in the Q value.

[0008] In the above-described one aspect, the connecting conductor has a thickness greater than the thickness of the thinnest portion of the coil. The electrical resistance of the connecting conductor in the above-described one aspect is lower than the electrical resistance of the connecting conductor in a configuration in which the connecting conductor has a thickness equal to or less than the thickness of the thinnest portion of the coil. Therefore, the above-described one aspect suppresses a decrease in the Q value of the multilayer coil component. [Effects of the Invention]

[0009] One aspect of the present invention provides a laminated coil component that suppresses a decrease in the Q value. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view of a laminated coil component according to one embodiment. [Figure 2] FIG. 2 is a perspective view of the coil according to this embodiment. [Figure 3] FIG. 3 is a plan view of the coil according to this embodiment as viewed from one side. [Figure 4] FIG. 4 is a plan view of one main surface of the coil according to this embodiment. [Figure 5] FIG. 5 is an exploded view showing the configuration of the laminated coil component according to this embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the drawings, the same or corresponding elements are designated by the same reference numerals, and redundant description will be omitted as appropriate.

[0012] The configuration of a laminated coil component 1 according to this embodiment will be described with reference to FIGS. 1 to 4. FIG. 1 is a perspective view of the laminated coil component according to this embodiment. FIG. 2 is a perspective view of the coil according to this embodiment. FIG. 3 is a plan view of the coil according to this embodiment as viewed from the side surface 2e shown in FIG. 1. FIG. 4 is a plan view of the coil according to this embodiment as viewed from the main surface 2b shown in FIG. 1. The laminated coil component 1 according to this embodiment is solder-mounted in an electronic device. The electronic device includes, for example, a circuit board or an electronic component.

[0013] 1 and 2, the laminated coil component 1 includes an element body 2, a coil 3 disposed within the element body 2, a pair of external electrodes 41, 42 disposed on the surface of the element body 2, and a pair of connecting conductors 51, 52 disposed within the element body 2. The external electrodes 41, 42 are electrically connected to the coil 3. The element body 2 has a rectangular parallelepiped shape. The rectangular parallelepiped shape includes a rectangular parallelepiped shape with chamfered corners and ridges, and a rectangular parallelepiped shape with rounded corners and ridges.

[0014] The element body 2 has a pair of principal surfaces 2a and 2b, a pair of side surfaces 2c and 2d, and a pair of side surfaces 2e and 2f that face each other. The principal surfaces 2a and 2b, the side surfaces 2c and 2d, and the side surfaces 2e and 2f are rectangular. The principal surfaces 2a and 2b are adjacent to the side surfaces 2c and 2d and the side surfaces 2e and 2f. The side surfaces 2c and 2d and the side surfaces 2e and 2f are adjacent to each other. When the multilayer coil component 1 is solder-mounted to an electronic device, the principal surface 2a faces the electronic device to which it is solder-mounted. The principal surfaces 2a and 2b, the side surfaces 2c and 2d, and the side surfaces 2e and 2f are flat. A flat surface means a surface that is formed with the aim of being flat, and is not limited to a geometrically perfect flat surface. The flat surface may include curvatures and irregularities that occur during the manufacturing process.

[0015] The direction D3 in which the pair of principal surfaces 2a, 2b face each other is perpendicular to the principal surfaces 2a, 2b, respectively. The direction D1 in which the pair of side surfaces 2c, 2d face each other is perpendicular to the side surfaces 2c, 2d, respectively. The direction D2 in which the pair of side surfaces 2e, 2f face each other is perpendicular to the side surfaces 2e, 2f, respectively. The direction D3 is perpendicular to the directions D1 and D2. The directions D1 and D2 are perpendicular to each other. A pair of recesses corresponding to the pair of external electrodes 41, 42 are formed in the element body 2.

[0016] The external electrodes 41 and 42 have an L-shaped cross section when viewed from direction D1. The recesses corresponding to the external electrodes 41 and 42 formed in the element body 2 are L-shaped when viewed from direction D1. The external electrode 41 includes a portion 41a and a portion 41b. The surface of the portion 41a faces the same direction as the side surface 2e, and the surface of the portion 41b faces the same direction as the main surface 2a. The portions 41a and 41b are continuous along the ridge between the side surface 2e and the main surface 2a. The external electrode 42 includes a portion 42a and a portion 42b. The surface of the portion 42a faces the same direction as the side surface 2f, and the surface of the portion 42b faces the same direction as the main surface 2a. The portions 42a and 42b are continuous along the ridge between the side surface 2f and the main surface 2a. The external electrodes 41 and 42 are adjacent to the coil 3 in a direction perpendicular to direction D1.

[0017] In this embodiment, the length of the external electrodes 41, 42 in direction D3 is longer than the length of the external electrodes 41, 42 in direction D2. The portions 41b, 42b are arranged so as to be exposed in the same direction as the main surface 2a. The surfaces of the portions 41b, 42b and the main surface 2a may be located on the same plane. The surfaces of the portions 41b, 42b may protrude from the main surface 2a. The portion 41a is arranged so as to be exposed in the same direction as the side surface 2e. The surface of the portion 41a and the side surface 2e may be located on the same plane. The surface of the portion 41a may protrude from the side surface 2e. The portion 42a is arranged on the side surface 2f so as to be exposed in the same direction as the side surface 2f. The surface of the portion 42a and the side surface 2f may be located on the same plane. The surface of the portion 42a may protrude from the side surface 2f. In this embodiment, the length of the portions 41a, 42a in direction D3 is longer than the length of the portions 41b, 42b in direction D2.

[0018] As shown in FIGS. 2 to 4, the coil 3 has a plurality of coil conductors 30. The plurality of coil conductors 30 are electrically connected to one another. The plurality of coil conductors 30 includes coil conductors 31, 32, 33, 34, 35, 36, and 37. The coil conductors 31 to 37 are arranged in that order along the direction D1 and are adjacent to one another. The coil conductor 31 is the endmost coil conductor including one end of the coil 3 in the direction D1. The coil conductor 37 is the endmost coil conductor including the other end of the coil 3 in the direction D1. The coil 3 is composed of seven coil conductors 31 to 37 connected in the direction D1. The number of turns in the coil 3 is 2.5. Each of the coil conductors 31 to 37 forms a part of a circular track in the coil 3. Each of the coil conductors 31 to 37 has a shape, for example, where a part of the loop is interrupted. Each of the plurality of coil conductors 30 has a path length and a thickness. The axial direction of the coil 3 is along the main surface 2a.

[0019] Each of the coil conductors 31 to 37 includes a first end corresponding to one end of the partially interrupted loop and a second end corresponding to the other end of the partially interrupted loop. Each of the coil conductors 31 to 37 extends along a path from the first end to the second end in each layer of the coil conductors 31 to 37. The length of the path from the first end to the second end of each of the coil conductors 31 to 37 is referred to as the path length of each of the coil conductors 31 to 37. The path length may be the minimum length from the end face of the first end to the end face of the second end of each of the coil conductors 31 to 37. For example, the path length may be the inner circumference from the end face of the first end to the end face of the second end of each of the coil conductors 31 to 37. Each of the layers of the coil conductors 31 to 37 corresponds to a layer constituting the laminated coil component 1. Each of the layers of the coil conductors 31 to 37 extends along a plane intersecting the direction D1 in which the coil conductors 31 to 37 are arranged. In this embodiment, the layers of the coil conductors 31 to 37 extend along directions D2 and D3.

[0020] The widths of the coil conductors 31 to 37 in the direction perpendicular to their paths are equal to each other. In this specification, "equal" does not necessarily mean that the values ​​are the same. The values ​​may be considered equal even if they include slight differences within a preset range, manufacturing errors, or measurement errors.

[0021] The coil conductors 31 to 37 have the same thickness. In this specification, the "thickness" of a coil conductor is the distance along direction D1 between one surface of the coil conductor in direction D1 and the other surface located opposite the one surface. The average distance between one surface and the other surface of the coil conductor in direction D1 may also be defined as the thickness of the coil conductor.

[0022] The ends of a pair of adjacent coil conductors among the multiple coil conductors 30 overlap and are connected to each other. In this embodiment, the ends of a pair of adjacent coil conductors among the multiple coil conductors 30 completely overlap, but it is sufficient if the ends overlap at least partially. Coil conductors 31 and 32, coil conductors 32 and 33, coil conductors 33 and 34, coil conductors 34 and 35, coil conductors 35 and 36, and coil conductors 36 and 37 are pairs of coil conductors adjacent to each other in direction D1. For example, the second end of coil conductor 31 and the first end of coil conductor 32 overlap and are connected to each other in direction D1. The ends of a pair of adjacent coil conductors among the multiple coil conductors 30 are directly and physically connected to each other.

[0023] Portion 31a is a portion of coil conductor 31 that does not overlap with coil conductor 32. Portion 32a is a portion of coil conductor 32 that does not overlap with coil conductor 31 or coil conductor 33. Portion 33a is a portion of coil conductor 33 that does not overlap with coil conductor 32 or coil conductor 34. Portion 34a is a portion of coil conductor 34 that does not overlap with coil conductor 33 or coil conductor 35. Portion 35a is a portion of coil conductor 35 that does not overlap with coil conductor 34 or coil conductor 36. Portion 36a is a portion of coil conductor 36 that does not overlap with coil conductor 35 or coil conductor 37. Portion 37a is a portion of coil conductor 37 that does not overlap with coil conductor 36. In this embodiment, portions 31a to 37a have the same thickness. The portions 31a to 37a are portions of the coil conductors 31 to 37 other than the ends, and are not overlapped with or connected to the ends of adjacent coil conductors. In this embodiment, the portions 31a to 37a are the thinnest portions of the coil 3.

[0024] The connecting conductor 51 electrically connects the coil 3 and the external electrode 41. The coil conductor 31 is physically connected to the connecting conductor 51. The connecting conductor 51 extends to connect a first end of the coil conductor 31 and the portion 41a of the external electrode 41. The connecting conductor 51 has a thickness greater than the thickness of the thinnest portion of the coil 3. In this embodiment, the connecting conductor 51 has a thickness greater than any of the portions 31a to 37a. The connecting conductor 51 has a thickness greater than the thickness of the thinnest portion 31a of the coil conductor 31. The connecting conductor 51 includes a portion 51a that is continuous with the coil conductor 31 in the same layer as the coil conductor 31, and a portion 51b that is arranged in a layer outer than the coil conductor 31 in the direction D1. "Outer than the coil conductor 31 in the direction D1" means closer to the side surface 2c than the coil conductor 31. In this embodiment, the portions 51a and 51b completely overlap each other, but they may also overlap at least partially.

[0025] The connecting conductor 51 protrudes further outward from the coil conductor 31 than it does inside the coil conductor 31 in direction D1. The center of the thickness of the connecting conductor 51 is located outside the center of the thickness of the coil conductor 31 in direction D1. The connecting conductor 51 does not include a portion that protrudes further inward from the coil conductor 31 in direction D1. "More inward than the coil conductor 31 in direction D1" means closer to the center of the element body 2 than the coil conductor 31 in direction D1. Portion 51b protrudes outward from the coil conductor 31 and portion 51a in direction D1.

[0026] The connecting conductor 52 electrically connects the coil 3 and the external electrode 42. The coil conductor 31 is physically connected to the connecting conductor 52. The connecting conductor 52 extends to connect the second end of the coil conductor 37 and the portion 42a of the external electrode 42. The connecting conductor 52 has a thickness greater than the thickness of the thinnest portion of the coil 3. In this embodiment, the connecting conductor 52 has a thickness greater than any of the portions 31a to 37a. The connecting conductor 52 has a thickness greater than the thickness of the thinnest portion 37a of the coil conductor 37. The connecting conductor 52 includes a portion 52a that is continuous with the coil conductor 37 in the same layer as the coil conductor 37, and a portion 52b that is arranged in a layer outer than the coil conductor 37 in the direction D1. "Outer than the coil conductor 37 in the direction D1" means closer to the side surface 2d than the coil conductor 37. In this embodiment, the portions 52a and 52b completely overlap each other, but they may also overlap at least partially.

[0027] The connecting conductor 52 protrudes further outward from the coil conductor 37 than it does inside the coil conductor 37 in direction D1. The center of the thickness of the connecting conductor 52 is located outside the center of the thickness of the coil conductor 37 in direction D1. The connecting conductor 52 does not include a portion that protrudes further inward than the coil conductor 37 in direction D1. "More inward than the coil conductor 37 in direction D1" means closer to the center of the element body 2 than the coil conductor 37 in direction D1. Portion 52b protrudes outward from the coil conductor 37 and portion 52a in direction D1.

[0028] The connection conductors 51 and 52 have the same thickness. The connection conductors 51 and 52 have the same width. The width of the connection conductors 51 and 52 may be equal to the width of the multiple coil conductors 30. The connection conductors 51 and 52 have a thickness greater than the thickness of at least one of the coil conductors 31 to 37. The connection conductors 51 and 52 have a thickness that is 1.25 times or more the thickness of at least one of the portions 31a to 37a. The connection conductors 51 and 52 may have a thickness that is equal to twice the thickness of at least one of the portions 31a to 37a. The connection conductors 51 and 52 are arranged so as not to overlap with the coil 3 when viewed from the direction D1.

[0029] FIG. 5 is an exploded view showing the configuration of a laminated coil component 1 according to this embodiment. In this embodiment, the lamination direction of the laminated coil component 1 is along direction D1. FIG. 5 shows multiple layers constituting the laminated coil component 1 as viewed from direction D1. The multiple layers constituting the laminated coil component 1 include a layer constituting the element body 2, a layer constituting the coil 3, a layer constituting the external electrodes 41 and 42, and a layer constituting the connecting conductors 51 and 52. The multiple layers have the same thickness. Below, the element body 2, the multiple coil conductors 30 of the coil 3, the external electrodes 41 and 42, and the connecting conductors 51 and 52 will be described with reference to FIG. 5.

[0030] The element body 2 is composed of multiple stacked insulator layers 20. In this embodiment, the number of the multiple insulator layers 20 is 13. FIG. 5 shows nine insulator layers 20, omitting the two insulator layers 20 located at both ends in the direction D1. In an actual element body 2, the insulator layers 20 are integrated to the extent that the boundaries between the insulator layers 20 are not visible. Each insulator layer 20 is composed of, for example, a non-magnetic material. The non-magnetic material includes, for example, a glass ceramic material or a dielectric material. In this embodiment, each insulator layer 20 is composed of a sintered body of a green sheet containing a non-magnetic material. Each insulator layer 20 may also be composed of a magnetic material.

[0031] The external electrodes 41 and 42 are each composed of a plurality of stacked electrode layers 410 and 420. In this embodiment, the number of the plurality of electrode layers 410 and 420 is nine. In the actual external electrode 41, the electrode layers 410 are integrated to the extent that the boundaries between the electrode layers 410 are not visible. In the actual external electrode 42, the electrode layers 420 are integrated to the extent that the boundaries between the electrode layers 420 are not visible. Each electrode layer 410 and 420 is provided in a recess formed in the corresponding insulator layer 20. The recess formed in each insulator layer 20 forms a pair of depressions corresponding to the external electrodes 41 and 42. Each electrode layer 410 and 420 is composed of, for example, a conductive material. The conductive material includes, for example, Ag or Pd. In this embodiment, each electrode layer 410 and 420 is composed of a sintered body of a conductive paste containing a powder of a conductive material.

[0032] The connecting conductor 51 is composed of two electrode layers, corresponding to the portion 51a and the portion 51b. The portion 51a is composed of the electrode layer 510a. The electrode layer 510a is continuous with the coil conductor layer 310. The portion 51b is composed of the electrode layer 510b. The electrode layer 510a and the electrode layer 510b entirely overlap each other. In the actual connecting conductor 51, the electrode layer 510a and the electrode layer 510b are integrated to the extent that the boundary between the electrode layer 510a and the electrode layer 510b is not visible. Each of the electrode layers 510a and 510b is provided in a recess formed in the corresponding insulator layer 20. Each of the electrode layers 510a and 510b is composed of, for example, the same material as each of the electrode layers 410 and 420. Each of the electrode layers 510a and 510b is composed of, for example, a sintered body of a conductive paste.

[0033] The connecting conductor 52 is composed of two electrode layers, corresponding to the portion 52a and the portion 52b. The portion 52a is composed of the electrode layer 520a. The electrode layer 520a is continuous with the coil conductor layer 370. The portion 52b is composed of the electrode layer 520b. The electrode layers 520a and 520b entirely overlap each other. In the actual connecting conductor 52, the electrode layers 520a and 520b are integrated to the extent that the boundary between the electrode layers 520a and 520b is not visible. Each of the electrode layers 520a and 520b is provided in a recess formed in the corresponding insulator layer 20. The electrode layers 520a and 520b are composed of, for example, the same material as the electrode layers 410 and 420. The electrode layers 520a and 520b are composed of, for example, a sintered body of a conductive paste.

[0034] The multiple coil conductors 30 are composed of multiple coil conductor layers corresponding to each of the multiple coil conductors 30. The coil conductors 31 to 37 are each composed of coil conductor layers 310 to 370. Each of the coil conductor layers 310 to 370 is provided in a missing portion formed in the corresponding insulator layer 20. Each of the coil conductor layers 310 to 370 is composed of, for example, the same material as each of the electrode layers 410, 420. Each of the coil conductor layers 310 to 370 is composed of, for example, a sintered body of conductive paste.

[0035] The coil 3 and the coil conductors 30 will be described below with reference to Figures 2 and 5. Coil conductor layers 310 to 370 shown in Figure 5 correspond to the coil conductors 31 to 37 when viewed from direction D1.

[0036] When viewed from direction D1, the coil 3 has a pentagonal shape. The pentagon is symmetrical in direction D2 with respect to a center line along direction D3. The pentagon includes a first side closest to the main surface 2b, a second side closest to the side surface 2f, a third and fourth sides closest to the main surface 2a, and a fifth side closest to the side surface 2e. The first and second sides are connected at a first vertex, the second and third sides are connected at a second vertex, the third and fourth sides are connected at a third vertex, the fourth and fifth sides are connected at a fourth vertex, and the fifth side is connected to the first side at a fifth vertex. The second and fifth sides are symmetrical with each other with respect to a center line passing through the third vertex between the third and fourth sides, and the third and fourth sides are symmetrical with each other with respect to each other. The first side is longer than the second and fifth sides. The second and fifth sides are longer than the third and fourth sides. When viewed from direction D1, the path of each of the plurality of coil conductors 30 includes at least one of the first to fifth sides.

[0037] The paths of the coil conductors 31, 34, and 37 include a first side. The path lengths of the coil conductors 31, 34, and 37 are 1 / 2 turn or less. The paths of the coil conductors 32 and 35 include a second side, a third side, and a fourth side. The path of the coil conductors 33 and 36 include a third side, a fourth side, and a fifth side. The path lengths of the coil conductors 32, 33, 35, and 36 are 1 / 2 turn or more. The coil conductors 33 and 35 have a path length longer than the path lengths of the coil conductors 31, 34, and 37. The coil conductors 33 and 35 may have the longest path length among the multiple coil conductors 30. The coil conductors 31, 34, and 37 may have the shortest path length among the multiple coil conductors 30.

[0038] As described above, in the laminated coil component 1, the connecting conductors 51, 52 have a thickness greater than the thickness of the thinnest portion of the coil 3. The electrical resistance of the connecting conductors 51, 52 in the laminated coil component 1 is smaller than the electrical resistance of the connecting conductors 51, 52 in a configuration in which the connecting conductors 51, 52 have a thickness equal to or less than the thickness of the thinnest portion of the coil 3. Therefore, the laminated coil component 1 suppresses a decrease in the Q value of the laminated coil component.

[0039] The connecting conductor 51 includes a portion that is continuous with the coil conductor 31 in the same layer as the coil conductor 31, and the connecting conductor 52 includes a portion that is continuous with the coil conductor 37 in the same layer as the coil conductor 37. The connecting conductors, which are in the same layer as the coil conductors 31 and 37 but do not include portions continuous with the coil conductors 31 and 37, are connected to the coil conductors 31 and 37 in the direction D1 in a layer other than the coil conductors 31 and 37. Because the connecting conductors include portions connected to the coil conductors 31 and 37 in the direction D1 in a layer other than the coil conductors 31 and 37, the path along which current flows in the connecting conductors, which are in the same layer as the coil conductors 31 and 37 but do not include portions continuous with the coil conductors 31 and 37, is longer than the path along which current flows in the connecting conductors 51 and 52. Therefore, the electrical resistance of the connecting conductors, which are in the same layer as the coil conductors 31 and 37 but do not include portions continuous with the coil conductors 31 and 37, is greater than the electrical resistance of the connecting conductors 51 and 52. Compared to the connecting conductors, which are in the same layer as the coil conductors 31 and 37 but do not include portions continuous with the coil conductors 31 and 37, the electrical resistance of the connecting conductors 51 and 52 is lower, and therefore the multilayer coil component 1 suppresses a decrease in the Q value of the multilayer coil component.

[0040] The connecting conductors 51 and 52 are arranged so as not to overlap the coil 3 when viewed from the direction D1. The connecting conductors 51, 52 and the coil 3 do not overlap when viewed from the direction D1, so the change in magnetic path length is smaller than when the connecting conductors 51, 52 and the coil 3 overlap. Therefore, the laminated coil component 1 suppresses a decrease in inductance value.

[0041] The connecting conductor 51 has a thickness greater than the thickness of the thinnest portion 31a of the coil conductor 31. The connecting conductor 52 has a thickness greater than the thickness of the thinnest portion 37a of the coil conductor 37. The electrical resistance of the connecting conductor 51 is smaller than that of the connecting conductor 51 in a configuration in which the connecting conductor 51 has a thickness equal to or smaller than that of the portion 31a. The electrical resistance of the connecting conductor 52 is smaller than that of the connecting conductor 52 in a configuration in which the connecting conductor 52 has a thickness equal to or smaller than that of the portion 37a. Therefore, the laminated coil component 1 suppresses a decrease in the Q value of the laminated coil component.

[0042] The connecting conductor 51 protrudes further outward from the coil conductor 31 in the direction D1 than the inside of the coil conductor 31. The connecting conductor 52 protrudes further outward from the coil conductor 37 in the direction D1 than the inside of the coil conductor 37. Compared with the connecting conductors that protrude more inward than outward from the coil conductor 31, the connecting conductor 51 has a smaller portion protruding inward from the coil conductor 31, and therefore the area in which the connecting conductor 51 faces the coil 3 in the direction perpendicular to direction D1 is small. As a result, the stray capacitance generated between the connecting conductor 51 and the coil 3 is small, and the multilayer coil component 1 suppresses a decrease in the self-resonant frequency. Compared with the connecting conductors that protrude more inward than outward from the coil conductor 37, the connecting conductor 52 has a smaller portion protruding inward from the coil conductor 37, and therefore the area in which the connecting conductor 52 faces the coil 3 in the direction perpendicular to direction D1 is small. As a result, the stray capacitance generated between the connecting conductor 52 and the coil 3 is small, and the multilayer coil component 1 suppresses a decrease in the self-resonant frequency. The connecting conductor 51 does not include a portion that protrudes inward beyond the coil conductor 31, and therefore the connecting conductor 51 does not face the coil 3 in the direction perpendicular to direction D1. The connecting conductor 52 does not include a portion that protrudes inward beyond the coil conductor 37, and therefore the connecting conductor 52 does not face the coil 3 in the direction perpendicular to direction D1. Therefore, the multilayer coil component 1 suppresses a decrease in the self-resonant frequency.

[0043] The present invention has been described in detail above based on the embodiments. However, the present invention is not limited to the above embodiments. Various modifications of the present invention are possible without departing from the spirit and scope of the present invention.

[0044] It is sufficient that at least one of the connecting conductors 51, 52 has a thickness greater than the thickness of the thinnest portion of the coil 3. It is sufficient that at least one of the connecting conductors 51, 52 has a thickness greater than the thickness of at least one of the portions 31a to 37a. In the laminated coil component 1, since both of the connecting conductors 51, 52 have a thickness greater than the thickness of any of the portions 31a to 37a, the laminated coil component 1 further suppresses a decrease in the Q value of the laminated coil component. The connecting conductors 51 and 52 do not necessarily have to include portions that are continuous with the endmost coil conductors 31 and 37 in the same layer as the endmost coil conductors 31 and 37 . The connecting conductors 51 and 52 may be in the same layer as the endmost coil conductors 31 and 37 and may be continuous with the endmost coil conductors 31 and 37 as a whole. The connecting conductors 51 and 52 may have a thickness equal to that of the endmost coil conductors 31 and 37 . The coil 3 is not limited to a pentagonal shape, and may have a square shape or a circular shape.

[0045] As can be understood from the above description of the embodiments and modifications, the present specification includes disclosure of the following aspects. (Appendix 1) The base body and a coil disposed within the element body and including a plurality of coil conductors aligned in one direction; an external electrode disposed on a surface of the element body and adjacent to the coil in a direction perpendicular to the one direction; a connecting conductor disposed within the element body and electrically connecting the coil and the external electrode to each other, the plurality of coil conductors include an endmost coil conductor that includes an end of the coil and is physically connected to the connecting conductor; the connecting conductor has a thickness greater than the thickness of the thinnest part of the coil; Multilayer coil components. (Appendix 2) 2. The laminated coil component according to claim 1, wherein the connecting conductor includes a portion that is continuous with the endmost coil conductor in the same layer as the endmost coil conductor. (Appendix 3) the connecting conductor is arranged so as not to overlap with the coil when viewed from the one direction. 3. The laminated coil component according to claim 1 or 2. (Appendix 4) 4. The laminated coil component according to any one of appendixes 1 to 3, wherein the connecting conductor has a thickness greater than the thickness of the thinnest part of the outermost coil conductor. (Appendix 5) 5. The laminated coil component according to claim 1, wherein the connecting conductor protrudes more toward the outside of the outermost coil conductor than toward the inside of the outermost coil conductor in the one direction. [Explanation of symbols]

[0046] 1... multilayer coil component, 2... element body, 3... coil, 30... multiple coil conductors, 31, 32, 33, 34, 35, 36, 37... coil conductors, 41, 42... external electrodes, 51, 52... connecting conductors, 51a, 52a... portions, D1, D2, D3... directions.

Claims

1. The base body and a coil disposed within the element body and including a plurality of coil conductors aligned in one direction; an external electrode disposed on a surface of the element body and adjacent to the coil in a direction perpendicular to the one direction; a connecting conductor disposed within the element body and electrically connecting the coil and the external electrode to each other, the plurality of coil conductors include an endmost coil conductor that includes an end of the coil and is physically connected to the connecting conductor; the connecting conductor has a thickness greater than the thickness of the thinnest part of the coil; Multilayer coil components.

2. The laminated coil component according to claim 1 , wherein the connecting conductor includes a portion that is continuous with the endmost coil conductor in the same layer as the endmost coil conductor.

3. the connecting conductor is arranged so as not to overlap with the coil when viewed from the one direction. The laminated coil component according to claim 1 or 2.

4. 3. The laminated coil component according to claim 1, wherein the connecting conductor has a thickness greater than a thickness of the thinnest portion of the outermost coil conductor.

5. 3. The laminated coil component according to claim 1, wherein the connecting conductor protrudes further outward from the outermost coil conductor than from the innermost coil conductor in the one direction.

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