Laminated coil component

Abstract

This laminated coil component is provided with an element body, a coil disposed in the element body, an external electrode disposed on the surface of the element body, and a connection conductor disposed in the element body. The coil includes a plurality of coil conductors arranged in one direction. The external electrode is adjacent to the coil in a direction orthogonal to the one direction. The connection conductor electrically connects the coil and the external electrode to each other. The plurality of coil conductors includes an endmost coil conductor including an end of the coil and physically connected to the connection conductor. The connection conductor has a thickness greater than a thickness of a portion of the coil having the smallest thickness.

Description

Technical Field

[0001] The present disclosure relates to a laminated coil component. Background Art

[0002] A laminated coil component is known, which includes: an element body, a coil arranged in the element body, an external electrode arranged on the surface of the element body, and a connecting conductor that electrically connects the coil and the external electrode (for example, Japanese Patent Application Laid-Open No. 2018-113309). Summary of the Invention

[0003] An object of one embodiment of the present disclosure is to provide a laminated coil component that suppresses a decrease in quality factor (hereinafter referred to as Q factor).

[0004] A laminated coil component according to one embodiment of the present disclosure comprises: a body, a coil disposed within the body, an external electrode disposed on the surface of the body, and a connecting conductor disposed within the body. The coil includes a plurality of coil conductors arranged along one direction. The external electrode is adjacent to the coil in a direction orthogonal to the one direction. The connecting conductor electrically connects the coil to the external electrode. The plurality of coil conductors include: a coil conductor at the very end, which 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 smallest portion of the coil.

[0005] The Q value of a laminated coil component is inversely proportional to its resistance. The resistance of a laminated coil component, which electrically connects the coil to an external electrode, depends on the combined resistance of the coil and the connecting conductor. The resistance of a conductor is inversely proportional to its cross-sectional area, so the resistance of the connecting conductor varies depending on its thickness. Consequently, the Q value of a laminated coil component varies depending on the thickness of the connecting conductor.

[0006] In laminated coil components, multiple inductance values ​​are required for a given external dimension. The inductance is inversely proportional to the magnetic path length. Since the magnetic path length depends on the thickness of the multiple coil conductors that make up the coil, it is difficult to maintain a constant coil thickness.

[0007] To achieve high-inductance laminated coil components, the magnetic path length is sometimes reduced by reducing the thickness of the coil conductor. Reducing the coil conductor's thickness reduces its cross-sectional area, increasing the resistance of the laminated coil component. Consequently, laminated coil components with high inductance tend to have a lower Q factor.

[0008] In laminated coil components, the thickness of the connecting conductors has little effect on the magnetic path length of the connecting conductors, so the inductance value is not easily affected by the thickness of the connecting conductors. Increasing the thickness of the connecting conductors increases the cross-sectional area of ​​the connecting conductors, thereby reducing the resistance of the laminated coil component. Therefore, by simply increasing the thickness of the connecting conductors, a laminated coil component with high inductance and suppressed Q value reduction can be provided.

[0009] In one embodiment, the connecting conductor has a thickness greater than the thickness of the smallest portion of the coil. The electrical resistance of the connecting conductor in this embodiment is lower than the electrical resistance of the connecting conductor in a configuration where the connecting conductor has a thickness equal to or less than the thickness of the smallest portion of the coil. Therefore, this embodiment minimizes a decrease in the Q value of the laminated coil component.

[0010] The present disclosure will be more fully understood from the detailed description and accompanying drawings given below, which are given by way of example only and, therefore, should not be considered as limiting the present disclosure.

[0011] The further scope of applicability of the present disclosure will become apparent from the detailed description given below. However, it should be understood that the detailed description and specific examples indicating the embodiments of the present disclosure are given by way of example only, and various changes and modifications within the spirit and scope of the present disclosure will become apparent to those skilled in the art based on the detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a perspective view of a laminated coil component according to one embodiment.

[0013] Figure 2 It is a perspective view of the coil according to this embodiment.

[0014] Figure 3 This is a plan view of the coil according to the present embodiment as viewed from one side.

[0015] Figure 4 This is a plan view of the coil according to the present embodiment as viewed from one main surface.

[0016] Figure 5 It is an exploded view showing the structure of the laminated coil component according to the present embodiment. DETAILED DESCRIPTION

[0017] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the following description, the same elements or elements having the same functions are denoted by the same reference numerals, and repeated descriptions are omitted.

[0018] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. In the description of the drawings, the same or corresponding elements are denoted by the same reference numerals, and duplicate descriptions are omitted as appropriate.

[0019] Reference Figures 1 to 4 , the structure of the laminated coil component 1 according to this embodiment will be described. Figure 1 This is a perspective view of the laminated coil component according to this embodiment. Figure 2 It is a perspective view of the coil according to this embodiment. Figure 3 It is from Figure 1 The side surface 2e shown is a plan view of the coil according to the present embodiment. Figure 4 It is from Figure 1 The main surface 2b shown is a plan view of the coil according to this embodiment. The laminated coil component 1 according to this embodiment is soldered and mounted on an electronic device. The electronic device includes, for example, a circuit board or an electronic component.

[0020] like Figure 1 and Figure 2 As shown, 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 edges, and a rectangular parallelepiped shape with rounded corners and edges.

[0021] The element body 2 has a pair of main surfaces 2a, 2b, a pair of side surfaces 2c, 2d, and a pair of side surfaces 2e, 2f that are opposite to each other. The main surfaces 2a, 2b, the side surfaces 2c, 2d, and the side surfaces 2e, 2f are rectangular. The main surfaces 2a, 2b are adjacent to the side surfaces 2c, 2d, and the side surfaces 2e, 2f. The side surfaces 2c, 2d, and the side surfaces 2e, 2f are adjacent to each other. When the stacked coil component 1 is soldered and mounted on an electronic device, the main surface 2a is opposite to the electronic device to be soldered and mounted. The main surfaces 2a, 2b, the side surfaces 2c, 2d, and the side surfaces 2e, 2f are planes. A plane refers to a surface formed with a plane as the goal, and is not limited to a geometrically complete plane. A plane may include bends and bumps generated during the manufacturing process.

[0022] The direction D3 in which the pair of principal surfaces 2a and 2b oppose each other is perpendicular to the principal surfaces 2a and 2b, respectively. The direction D1 in which the pair of side surfaces 2c and 2d oppose each other is perpendicular to the side surfaces 2c and 2d, respectively. The direction D2 in which the pair of side surfaces 2e and 2f oppose each other is perpendicular to the side surfaces 2e and 2f, respectively. Direction D3 is perpendicular to both directions D1 and D2. Directions D1 and D2 are mutually perpendicular. A pair of recesses corresponding to the pair of external electrodes 41 and 42 are formed in the element body 2.

[0023] When viewed from direction D1, external electrodes 41 and 42 have an L-shaped cross-section. When viewed from direction D1, the depressions corresponding to external electrodes 41 and 42 formed in element body 2 have an L-shape. External electrode 41 includes portion 41a and portion 41b. The surface of portion 41a faces the same direction as side surface 2e, and the surface of portion 41b faces the same direction as main surface 2a. Portions 41a and 41b are continuous along the ridgeline between side surface 2e and main surface 2a. External electrode 42 includes portion 42a and portion 42b. The surface of portion 42a faces the same direction as side surface 2f, and the surface of portion 42b faces the same direction as main surface 2a. Portions 42a and 42b are continuous along the ridgeline between side surface 2f and main surface 2a. External electrodes 41 and 42 are adjacent to coil 3 in a direction perpendicular to direction D1.

[0024] In this embodiment, the length of the external electrodes 41 and 42 in direction D3 is longer than the length of the external electrodes 41 and 42 in direction D2. Portions 41b and 42b are arranged so as to be exposed in the same direction as the principal surface 2a. The surfaces of portions 41b and 42b may be coplanar with the principal surface 2a. The surfaces of portions 41b and 42b may protrude from the principal surface 2a. Portion 41a is arranged so as to be exposed in the same direction as the side surface 2e. The surface of portion 41a and side surface 2e may be coplanar with each other. The surface of portion 41a may protrude from side surface 2e. Portion 42a is arranged so as to be exposed on side surface 2f in the same direction as side surface 2f. The surface of portion 42a and side surface 2f may be coplanar with each other. The surface of portion 42a may protrude from side surface 2f. In this embodiment, the length of portions 41a and 42a in direction D3 is longer than the length of portions 41b and 42b in direction D2.

[0025] like Figures 2 to 4 As shown, the coil 3 has a plurality of coil conductors 30. The plurality of coil conductors 30 are electrically connected to each other. The plurality of coil conductors 30 include coil conductors 31, 32, 33, 34, 35, 36, and 37. The coil conductors 31 to 37 are arranged in sequence along the direction D1 and are adjacent to each other. The coil conductor 31 is the coil conductor that includes the endmost portion of one end of the coil 3 in the direction D1. The coil conductor 37 is the coil conductor that includes the endmost portion of 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 of the coil 3 is 2.5 turns. Each coil conductor 31 to 37 constitutes a part of the annular track of the coil 3. Each coil conductor 31 to 37 has a shape in which a part of the loop is interrupted, for example. The plurality of coil conductors 30 each has a path length and a thickness. The axial direction of the coil 3 is along the main surface 2a.

[0026] Each coil conductor 31-37 includes a first end corresponding to one end of the partially interrupted loop shape and a second end corresponding to the other end of the partially interrupted loop shape. Each coil conductor 31-37 extends along a path from the first end to the second end within its respective layer. The length of the path from the first end to the second end of each coil conductor 31-37 is referred to as the path length of each coil conductor 31-37. The path length may also be the minimum length from the end face of the first end to the end face of the second end of each coil conductor 31-37. 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 coil conductor 31-37. Each layer of coil conductors 31-37 corresponds to each layer that constitutes the laminated coil component 1. Each layer of coil conductors 31-37 extends along a plane that intersects the direction D1 in which the coil conductors 31-37 are arranged. In this embodiment, each layer of coil conductors 31-37 extends along directions D2 and D3.

[0027] The widths of the coil conductors 31 to 37 in a direction perpendicular to the path are equal. In this specification, "equal" does not necessarily mean that the values ​​are identical. Values ​​may be considered equal if they include slight differences within a predetermined range, manufacturing errors, or measurement errors.

[0028] Coil conductors 31-37 each have the same thickness. In this specification, the "thickness" of a coil conductor refers to the distance along direction D1 between one surface of the coil conductor and its opposite surface. Alternatively, the average distance between one surface and the other surface of the coil conductor along direction D1 may be considered the thickness of the coil conductor.

[0029] The ends of a pair of coil conductors adjacent to each other in the plurality of coil conductors 30 overlap with each other and are connected to each other. In the present embodiment, the ends of a pair of coil conductors adjacent to each other in the plurality of coil conductors 30 completely overlap with each other, but it is sufficient that at least a portion of the ends overlap with each other. Coil conductors 31, 32, coil conductors 32, 33, coil conductors 33, 34, coil conductors 34, 35, coil conductors 35, 36, and coil conductors 36, 37 are a pair of coil conductors adjacent to each other in direction D1. For example, the second end of the coil conductor 31 and the first end of the coil conductor 32 overlap with each other in direction D1 and are connected to each other. A pair of coil conductors adjacent to each other in the plurality of coil conductors 30 are directly physically connected to each other at their respective ends.

[0030] Portion 31a is the portion of coil conductor 31 that does not overlap with coil conductor 32. Portion 32a is the portion of coil conductor 32 that does not overlap with coil conductor 31 or coil conductor 33. Portion 33a is the portion of coil conductor 33 that does not overlap with coil conductor 32 or coil conductor 34. Portion 34a is the portion of coil conductor 34 that does not overlap with coil conductor 33 or coil conductor 35. Portion 35a is the portion of coil conductor 35 that does not overlap with coil conductor 34 or coil conductor 36. Portion 36a is the portion of coil conductor 36 that does not overlap with coil conductor 35 or coil conductor 37. Portion 37a is the portion of coil conductor 37 that does not overlap with coil conductor 36. In this embodiment, portions 31a to 37a have the same thickness. Portions 31a to 37a are the portions of each coil conductor 31 to 37 other than the ends, and are not overlapped with or connected to the ends of adjacent coil conductors. In this embodiment, portions 31a to 37a are the portions with the smallest thickness in coil 3.

[0031] 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 the first end of the coil conductor 31 to the portion 41a of the external electrode 41. The connecting conductor 51 is thicker than the smallest portion of the coil 3. In this embodiment, the connecting conductor 51 is thicker than any of the portions 31a to 37a. The connecting conductor 51 is thicker than the smallest portion 31a of the coil conductor 31. The connecting conductor 51 includes a portion 51a that is continuous with the coil conductor 31 on the same layer as the coil conductor 31, and a portion 51b that is located on a layer further outward from the coil conductor 31 in direction D1. "Further outward from the coil conductor 31 in direction D1" means being closer to the side surface 2c than the coil conductor 31. In this embodiment, portions 51a and 51b completely overlap, but they may also overlap at least partially.

[0032] Connecting conductor 51 protrudes outward from coil conductor 31 in direction D1, further from the inner side of coil conductor 31. The center of the thickness of connecting conductor 51 is located further outward from the center of the thickness of coil conductor 31 in direction D1. Connecting conductor 51 does not include a portion that protrudes further inward from coil conductor 31 in direction D1. Being further inward from coil conductor 31 in direction D1 means being closer to the center of element body 2 in direction D1 than coil conductor 31. Portion 51b protrudes outward from coil conductor 31 and portion 51a in direction D1.

[0033] 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 to the portion 42a of the external electrode 42. The connecting conductor 52 is thicker than the smallest portion of the coil 3. In this embodiment, the connecting conductor 52 is thicker than any of the portions 31a to 37a. The connecting conductor 52 is thicker than the smallest portion 37a of the coil conductor 37. The connecting conductor 52 includes a portion 52a that is continuous with the coil conductor 37 on the same layer as the coil conductor 37, and a portion 52b that is located on a layer further outward from the coil conductor 37 in direction D1. Further outward from the coil conductor 37 in direction D1 means closer to the side surface 2d than the coil conductor 37. In this embodiment, portions 52a and 52b completely overlap, but they may also overlap at least partially.

[0034] Connecting conductor 52 protrudes outward from coil conductor 37 in direction D1, further than the inner side of coil conductor 37. The center of the thickness of connecting conductor 52 is located outward from the center of the thickness of coil conductor 37 in direction D1. Connecting conductor 52 does not include a portion that protrudes inward from coil conductor 37 in direction D1. Being located inward from coil conductor 37 in direction D1 means being closer to the center of element body 2 in direction D1 than coil conductor 37. Portion 52b protrudes outward from coil conductor 37 and portion 52a in direction D1.

[0035] The thickness of the connecting conductor 51 and the connecting conductor 52 are equal to each other. The width of the connecting conductor 51 and the connecting conductor 52 are equal to each other. The width of the connecting conductor 51 and the connecting conductor 52 may be equal to the width of the plurality of coil conductors 30. The connecting conductors 51 and 52 have a thickness greater than the thickness of at least one of the coil conductors 31 to 37. The connecting conductors 51 and 52 have a thickness greater than or equal to 1.25 times the thickness of at least one of the portions 31a to 37a. The connecting conductors 51 and 52 may also have a thickness equal to twice the thickness of at least one of the portions 31a to 37a. The connecting conductors 51 and 52 are arranged so as not to overlap with the coil 3 when viewed from the direction D1.

[0036] Figure 5 1 is an exploded view showing the structure of the laminated coil component 1 according to the present embodiment. In the present embodiment, the laminated coil component 1 is laminated in a direction D1. Figure 5 The multiple layers constituting the laminated coil component 1 as viewed from the direction D1 are shown. 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 thicknesses of the multiple layers are equal to each other. Figure 5, the element body 2 , the plurality of coil conductors 30 of the coil 3 , the external electrodes 41 , 42 , and the connection conductors 51 , 52 will be described.

[0037] The element body 2 is composed of a plurality of stacked insulating layers 20. In this embodiment, the number of the plurality of insulating layers 20 is "13". Figure 5 The figure shows nine insulator layers 20, omitting the two insulator layers 20 at the two ends in direction D1. In the actual element body 2, the insulator layers 20 are integrated to such an extent that the boundaries between the insulator layers 20 are not discernible. Each insulator layer 20 is made of, for example, a non-magnetic material. Non-magnetic materials include, for example, glass ceramic materials or dielectric materials. In this embodiment, each insulator layer 20 is made of a green sheet containing a non-magnetic material. Each insulator layer 20 may also be made of a magnetic material.

[0038] The external electrodes 41 and 42 are respectively composed of a plurality of stacked electrode layers 410 and 420. In the present embodiment, the number of each of the plurality of electrode layers 410 and 420 is "9". In the actual external electrode 41, the electrode layers 410 are integrated to the extent that the boundaries between the electrode layers 410 cannot be identified. In the actual external electrode 42, the electrode layers 420 are integrated to the extent that the boundaries between the electrode layers 420 cannot be identified. Each electrode layer 410, 420 is provided in a defective portion formed in the corresponding insulating layer 20. A pair of recesses corresponding to the external electrodes 41, 42 can be obtained by forming the defective portion in each insulating layer 20. Each electrode layer 410, 420 is composed of, for example, a conductive material. The conductive material contains, for example, Ag or Pd. In the present embodiment, each electrode layer 410, 420 is composed of a sintered body of a conductive paste containing powder of a conductive material.

[0039] 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 layers 510a and 510b overlap with each other as a whole. In the actual connecting conductor 51, the electrode layers 510a and 510b are integrated to such an extent that the boundary between the electrode layers 510a and 510b cannot be identified. Each electrode layer 510a, 510b is provided in a defect formed in the corresponding insulating layer 20. Each electrode layer 510a, 510b is composed of, for example, the same material as the electrode layers 410, 420. Each electrode layer 510a, 510b is composed of, for example, a sintered body of a conductive paste.

[0040] 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 layer 520a and the electrode layer 520b overlap with each other as a whole. In the actual connecting conductor 52, the electrode layer 520a and the electrode layer 520b are integrated to such an extent that the boundary between the electrode layer 520a and the electrode layer 520b cannot be identified. Each electrode layer 520a, 520b is provided in the defect portion formed in the corresponding insulating layer 20. Each electrode layer 520a, 520b is composed of, for example, the same material as the electrode layers 410, 420. Each electrode layer 520a, 520b is composed of, for example, a sintered body of a conductive paste.

[0041] The plurality of coil conductors 30 are composed of a plurality of coil conductor layers corresponding to the respective coil conductors 30. The coil conductors 31 to 37 are respectively composed of coil conductor layers 310 to 370. Each coil conductor layer 310 to 370 is provided in a defect formed in the corresponding insulator layer 20. Each coil conductor layer 310 to 370 is composed of, for example, the same material as the electrode layers 410 and 420. Each coil conductor layer 310 to 370 is composed of, for example, a sintered body of a conductive paste.

[0042] Below, refer to Figure 2 and Figure 5 , the coil 3 and the plurality of coil conductors 30 will be described. Figure 5 The coil conductor layers 310 to 370 shown correspond to the coil conductors 31 to 37 viewed from the direction D1 .

[0043] When viewed from direction D1, the coil 3 is pentagonal. The pentagon is axially symmetrical in direction D2 relative to the center line along direction D3. The pentagon includes a first side located closest to the main surface 2b, a second side located closest to the side surface 2f, a third side and a fourth side located closest to the main surface 2a, and a fifth side located closest to the side surface 2e. The first side and the second side are connected at the first vertex, the second side and the third side are connected at the second vertex, the third side and the fourth side are connected at the third vertex, the fourth side and the fifth side are connected at the fourth vertex, and the fifth side and the first side are connected at the fifth vertex. Relative to the center line passing through the third vertex between the third and fourth sides, the second side and the fifth side are axially symmetrical with each other, and the third side and the fourth side are axially symmetrical with each other. The first side is longer than each of the second and fifth sides. Each of the second and fifth sides is longer than each of the third and fourth sides. When viewed from direction D1, the paths of each of the multiple coil conductors 30 include at least one of the first to fifth sides.

[0044] The paths of coil conductors 31, 34, and 37 include a first side. The paths of coil conductors 31, 34, and 37 have a length of less than 1 / 2 turn. The paths of coil conductors 32 and 35 include a second side, a third side, and a fourth side. The paths of coil conductors 33 and 36 include a third side, a fourth side, and a fifth side. The paths of coil conductors 32, 33, 35, and 36 have a length of more than 1 / 2 turn. The coil conductors 33 and 35 have a path length that is longer than the path length of the coil conductors 31, 34, and 37. The coil conductors 33 and 35 may have the longest path length among the plurality of coil conductors 30. The coil conductors 31, 34, and 37 may have the shortest path length among the plurality of coil conductors 30.

[0045] As described above, in laminated coil component 1, connecting conductors 51 and 52 have a thickness greater than the thickness of the smallest portion of coil 3. The electrical resistance of connecting conductors 51 and 52 in laminated coil component 1 is lower than the electrical resistance of connecting conductors 51 and 52 in a configuration where connecting conductors 51 and 52 have a thickness equal to or less than the thickness of the smallest portion of coil 3. Therefore, laminated coil component 1 suppresses a decrease in the Q value of the laminated coil component.

[0046] The connection conductor 51 includes a portion continuous with the coil conductor 31 in the same layer as the coil conductor 31 , and the connection conductor 52 includes a portion continuous with the coil conductor 37 in the same layer as the coil conductor 37 .

[0047] The connecting conductors, which are not included in the portion continuous with coil conductors 31 and 37 on the same layer as coil conductors 31 and 37, are connected to coil conductors 31 and 37 in direction D1 on a layer different from coil conductors 31 and 37. Because the connecting conductors, which are not included in the portion continuous with coil conductors 31 and 37 on a layer different from coil conductors 31 and 37, are included in the portion continuous with coil conductors 31 and 37 on a layer different from coil conductors 31 and 37, the path through which the current flows is longer than the path through which the current flows through connecting conductors 51 and 52. Therefore, the resistance of the connecting conductors, which are not included in the portion continuous with coil conductors 31 and 37 on the same layer as coil conductors 31 and 37, is greater than the resistance of connecting conductors 51 and 52. Since the resistance of connecting conductors 51 and 52 is lower than that of the connecting conductors, which are not included in the portion continuous with coil conductors 31 and 37 on the same layer as coil conductors 31 and 37, the laminated coil component 1 suppresses a decrease in the Q value of the laminated coil component.

[0048] The connection conductors 51 and 52 are arranged so as not to overlap with the coil 3 when viewed from the direction D1.

[0049] Since the connection conductors 51 and 52 do not overlap with the coil 3 when viewed from the direction D1, the change in magnetic path length is smaller than when the connection conductors 51 and 52 overlap with the coil 3. Therefore, the laminated coil component 1 suppresses a decrease in inductance.

[0050] The connection conductor 51 has a thickness greater than the thickness of the smallest portion 31 a of the coil conductor 31 . The connection conductor 52 has a thickness greater than the thickness of the smallest portion 37 a of the coil conductor 37 .

[0051] The resistance of connecting conductor 51 is lower than the resistance of connecting conductor 51 in a configuration where connecting conductor 51 has a thickness equal to or less than the thickness of portion 31a. The resistance of connecting conductor 52 is lower than the resistance of connecting conductor 52 in a configuration where connecting conductor 52 has a thickness equal to or less than the thickness of portion 37a. Therefore, laminated coil component 1 suppresses a decrease in the Q value of the laminated coil component.

[0052] The connection conductor 51 protrudes outward from the coil conductor 31 in the direction D1 rather than the inner side of the coil conductor 31. The connection conductor 52 protrudes outward from the coil conductor 37 rather than the inner side of the coil conductor 37 in the direction D1.

[0053] Compared to a connecting conductor that protrudes further inward from the outside of coil conductor 31, the portion of connecting conductor 51 that protrudes inward from coil conductor 31 is smaller. Therefore, the area of ​​connection conductor 51 facing coil 3 in a direction perpendicular to direction D1 is smaller. As a result, the stray capacitance generated between connecting conductor 51 and coil 3 is smaller, and thus, the stacked coil component 1 suppresses a decrease in self-resonant frequency.

[0054] Compared to the connecting conductor that protrudes further inward from the outside of coil conductor 37, the portion of connecting conductor 52 that protrudes inward from coil conductor 37 is smaller. Therefore, the area of ​​connecting conductor 52 facing coil 3 in a direction perpendicular to direction D1 is smaller. As a result, the parasitic capacitance generated between connecting conductor 52 and coil 3 is reduced, and thus the stacked coil component 1 suppresses a decrease in the self-resonant frequency.

[0055] The connecting conductor 51 does not include a portion protruding inwardly from the coil conductor 31, and therefore does not face the coil 3 in a direction perpendicular to the direction D1. The connecting conductor 52 does not include a portion protruding inwardly from the coil conductor 37, and therefore does not face the coil 3 in a direction perpendicular to the direction D1. Therefore, the laminated coil component 1 suppresses a decrease in the self-resonant frequency.

[0056] The present disclosure has been described in detail above based on its embodiments. However, the present disclosure is not limited to the above embodiments. The present disclosure can be modified in various ways without departing from the scope of its gist.

[0057] At least one of the connecting conductors 51 and 52 may be thicker than the smallest portion of the coil 3. At least one of the connecting conductors 51 and 52 may be thicker than at least one of the portions 31a to 37a. In the laminated coil component 1, since both the connecting conductors 51 and 52 are thicker than 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.

[0058] The connection conductors 51 and 52 do not need to include a portion continuous with the coil conductors 31 and 37 at the end portions in the same layer as the coil conductors 31 and 37 at the end portions.

[0059] The connection conductors 51 and 52 may be continuous with the coil conductors 31 and 37 at the end portions as a whole in the same layer as the coil conductors 31 and 37 at the end portions.

[0060] The connection conductors 51 and 52 may have a thickness equal to the thickness of the coil conductors 31 and 37 at the end portions.

[0061] The coil 3 is not limited to a pentagonal shape, but may be a quadrilateral or a circular shape.

Claims

1. A laminated coil component, wherein: have: body; a coil disposed in the element body and comprising a plurality of coil conductors arranged along 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; as well as a connecting conductor disposed within the element body and electrically connecting the coil and the external electrode; The plurality of coil conductors include: a coil conductor at the end, which includes an end of the coil and is physically connected to the connection conductor; The connecting conductor has a thickness greater than a thickness of a portion of the coil having the smallest thickness.

2. The laminated coil component according to claim 1, wherein The connection conductor includes a portion continuous with the coil conductor at the end portion in the same layer as the coil conductor at the end portion.

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

4. The laminated coil component according to any one of claims 1 to 3, wherein The connection conductor has a thickness greater than a thickness of a portion of the coil conductor at the end portion where the thickness is smallest.

5. The laminated coil component according to any one of claims 1 to 4, wherein The connection conductor protrudes in the one direction toward the outer side of the coil conductor at the end portion rather than the inner side of the coil conductor at the end portion.

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