Laminated coil component

Abstract

To provide a laminated coil component capable of suppressing stray capacitance between a coil and external electrodes.SOLUTION: A laminated coil component 1 includes a base body 2, external electrodes 41, 42, and a coil 3. The base body 2 has principal surfaces 2a, 2b, end surfaces 2e, 2f, and side surfaces 2c, 2d. A coil axis AX of the coil 3 extends along direction D1. The coil 3 has multiple coil conductors 31 to 37 and through-hole conductors T1 to T6 that mutually connect the coil conductors 31 to 37. The number of through-hole conductors T1 to T6 located on the principal surface 2b side of the center of the base body in direction D3 is greater than the number of through-hole conductors located elsewhere.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] There is known a laminated coil component that includes an element body, external electrodes provided on the element body, and a coil disposed within the element body (for example, see Patent Document 1). In this laminated coil component, the coil has a plurality of coil conductors and through-hole conductors. By connecting the coil conductors with each other via the through-hole conductors, the number of turns of the coil can be increased. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-34667 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned laminated coil component, it is desirable to suppress the stray capacitance between the coil and the external electrodes.

[0005] An object of the present disclosure is to provide a laminated coil component that can reduce stray capacitance between a coil and an external electrode. [Means for solving the problem]

[0006] (1) A laminated coil component according to one aspect of the present disclosure comprises: an element body having first and second main surfaces opposing each other, first end surfaces and second end surfaces opposing each other, and first and second side surfaces opposing each other; and a first external electrode and a second external electrode arranged on the first main surface; and a coil having a first end connected to the first external electrode and a second end connected to the second external electrode, wherein a coil axis of the coil extends along a direction in which the first side surfaces and the second side surfaces oppose each other; the coil having a plurality of coil conductors and through-hole conductors connecting the plurality of coil conductors to each other; and the number of the through-hole conductors arranged closer to the second main surface than a center of the element body in the direction in which the first and second main surfaces oppose each other is greater than the number of the other through-hole conductors.

[0007] In this laminated coil component, more than half of the through-hole conductors are arranged closer to the second principal surface than the center of the element body in the opposing direction of the first and second principal surfaces. This allows more than half of the through-hole conductors to be spaced apart from the first and second external electrodes. This makes it possible to suppress stray capacitance occurring between more than half of the through-hole conductors and the first and second external electrodes. As a result, it is possible to suppress stray capacitance between the coil and the first and second external electrodes.

[0008] (2) In the multilayer coil component described above in (1), all of the through-hole conductors may be disposed closer to the second principal surface than the center of the element body in the opposing direction of the first principal surface and the second principal surface, thereby further reducing stray capacitance between the coil and the first external electrode and the second external electrode.

[0009] (3) In the laminated coil component of (1) or (2), the coil may extend from the first end to between the coil axis and the first main surface, and then between the coil axis and the second end surface. In this case, the through-hole conductor can be disposed closer to the second main surface than the center of the element body in the opposing direction of the first and second main surfaces, without reducing the number of turns of the coil.

[0010] (4) In any one of the laminated coil components (1) to (3) above, the first external electrode and the second external electrode may each have a first electrode portion provided on the first end surface and a second electrode portion provided on the first main surface. In this case, stray capacitance between the through-hole conductor and the second electrode portion can be reliably suppressed. Furthermore, stray capacitance between the through-hole conductor and the first electrode portion is also likely to be suppressed. Therefore, stray capacitance between the coil and the first external electrode and the second external electrode can be suppressed.

[0011] (5) In any one of the multilayer coil components (1) to (4) above, the first external electrode and the second external electrode may be embedded in the element body so as to be exposed from the first main surface. In this case, the through-hole conductors tend to be close to the first external electrode and the second external electrode. Therefore, a configuration that can separate the through-hole conductors from the first external electrode and the second external electrode is particularly effective in suppressing stray capacitance between the coil and the first external electrode and the second external electrode. [Effects of the Invention]

[0012] The present disclosure provides a laminated coil component that can reduce stray capacitance between a coil and an external electrode. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a perspective view of a laminated coil component according to a first embodiment. [Figure 2] FIG. 2 is a plan view of the laminated coil component of FIG. 1 as viewed from the main surface 2a. [Figure 3] FIG. 3 is a plan view of the laminated coil component of FIG. 1 as viewed from the side surface 2c. [Figure 4] FIG. 4 is an exploded view of the laminated coil component of FIG. [Figure 5] FIG. 5 is a plan view of a laminated coil component according to a comparative example. [Figure 6] FIG. 6 is a plan view of a laminated coil component according to a modified example. [Figure 7]FIG. 7 is a perspective view of the laminated coil component according to the second embodiment. [Figure 8] FIG. 8 is a plan view of the laminated coil component of FIG. 7 as viewed from the side surface 2c. [Figure 9] FIG. 9 is an exploded view of the laminated coil component of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0014] 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.

[0015] (First embodiment) The configuration of a laminated coil component 1 according to a first embodiment will be described with reference to FIGS. 1 to 4. FIG. 1 is a perspective view of the laminated coil component according to the first embodiment. FIG. 2 is a plan view of the laminated coil component of FIG. 1 as seen from a main surface 2a. FIG. 3 is a plan view of the laminated coil component of FIG. 1 as seen from a side surface 2c. In FIG. 3, an element body 2 is indicated by a dashed line. 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. The laminated coil component 1 is, for example, a high-frequency inductor.

[0016] As shown in FIGS. 1 to 3, 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.

[0017] The element body 2 has a pair of principal surfaces 2a and 2b facing each other, a pair of side surfaces 2c and 2d facing each other, and a pair of end surfaces 2e and 2f facing each other. The principal surfaces 2a and 2b, the side surfaces 2c and 2d, and the end surfaces 2e and 2f are rectangular. The principal surfaces 2a and 2b are adjacent to the side surfaces 2c and 2d and the end surfaces 2e and 2f. The side surfaces 2c and 2d and the end 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 end surfaces 2e and 2f are flat. A flat surface means a surface formed with the intention 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.

[0018] 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 end surfaces 2e, 2f face each other is perpendicular to the end 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.

[0019] As shown in FIG. 4, the element body 2 includes multiple insulator layers 20 stacked in a direction D1. The multiple insulator layers 20 are integrated to the extent that the boundaries between the insulator layers 20 are not visible. Each insulator layer 20 is made of, for example, a non-magnetic material. The non-magnetic material includes, for example, a glass ceramic material or a dielectric material. The glass component is, for example, borosilicate glass. The dielectric material is, for example, a dielectric ceramic such as a BaTiO3-based, Ba(Ti,Zr)O3-based, or (Ba,Ca)TiO3-based material. In this embodiment, each insulator layer 20 is made of a sintered green sheet containing a non-magnetic material. Each insulator layer 20 may also be made of a magnetic material.

[0020] The multiple insulator layers 20 include a pair of outer layers 21, 22 (not shown in FIG. 4) shown in FIG. 2. The outer layers 21, 22 are located at both ends in the direction D1 and constitute the outermost layers of the element body 2. The outer layer 21 has a side surface 2c. The outer layer 22 has a side surface 2d. The remaining multiple insulator layers 20 are arranged between the outer layers 21, 22 in the direction D1 and constitute the laminate 23 shown in FIG. 2. The outer layers 21, 22 have higher rigidity than the laminate 23, and therefore can suppress breakage of the element body 2. The rigidity can be adjusted, for example, by the filler content. The coil 3, external electrodes 41, 42, and connecting conductors 51, 52 are arranged in the laminate 23 and not in the outer layers 21, 22.

[0021] The thicknesses of the multiple insulator layers 20 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. The thicknesses of the outer layers 21 and 22 may be different from the thicknesses of the insulator layers 20 that make up the laminate 23.

[0022] The external electrodes 41, 42 are arranged at least on the main surface 2a. The external electrodes 41, 42 are spaced apart from each other in direction D2. In this embodiment, the external electrode 41 is arranged on the main surface 2a and the end surface 2e. The external electrode 42 is arranged on the main surface 2a and the end surface 2f. The external electrodes 41, 42 are embedded in the element body 2 so as to be exposed from at least the main surface 2a. In this embodiment, the external electrode 41 is embedded in the element body 2 so as to be exposed from the end surface 2e and the main surface 2a. The external electrode 42 is embedded in the element body 2 so as to be exposed from the end surface 2f and the main surface 2a. The external electrodes 41, 42 have an L-shaped cross section when viewed from direction D1. The recesses corresponding to the external electrodes 41, 42 formed in the element body 2 have an L-shape when viewed from direction D1.

[0023] The external electrode 41 includes an electrode portion 41a and an electrode portion 41b. The electrode portion 41a is exposed from the end face 2e. The electrode portion 41b is exposed from the main face 2a. The surface of the electrode portion 41a faces the same direction as the end face 2e. The surface of the electrode portion 41b faces the same direction as the main face 2a. The electrode portions 41a and 41b are continuous along the ridge between the end face 2e and the main face 2a.

[0024] The external electrode 42 includes an electrode portion 42a and an electrode portion 42b. The electrode portion 42a is exposed from the end face 2f. The electrode portion 42b is exposed from the main face 2a. The surface of the electrode portion 42a faces the same direction as the end face 2f. The surface of the electrode portion 42b faces the same direction as the main face 2a. The electrode portions 42a and 42b are continuous along the ridge between the end face 2f and the main face 2a.

[0025] 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 electrode portions 41b, 42b are arranged so as to be exposed in the same direction as the main surface 2a. The surfaces of the electrode portions 41b, 42b and the main surface 2a may be located on the same plane. The surfaces of the electrode portions 41b, 42b may protrude from the main surface 2a. The electrode portion 41a is arranged so as to be exposed in the same direction as the end surface 2e. The surfaces of the electrode portion 41a and the end surface 2e may be located on the same plane. The surface of the electrode portion 41a may protrude from the end surface 2e. The electrode portion 42a is arranged on the end surface 2f so as to be exposed in the same direction as the end surface 2f. The surfaces of the electrode portion 42a and the end surface 2f may be located on the same plane. The surface of the electrode portion 42a may protrude from the end surface 2f. In this embodiment, the length of the electrode portions 41a and 42a in the direction D3 is longer than the length of the electrode portions 41b and 42b in the direction D2.

[0026] As shown in FIG. 3, the coil 3 is connected to external electrodes 41, 42 (see FIG. 1). The coil 3 has a first end 3x and a second end 3y. The first end 3x is connected to the external electrode 41 by a connecting conductor 51. The second end 3y is connected to the external electrode 42 by a connecting conductor 52. The coil axis AX of the coil 3 extends along direction D1. The coil 3 is disposed inside the element body 2 and is not exposed from the element body 2.

[0027] The coil 3 is wound counterclockwise around the coil axis AX when viewed from the side surface 2c. The coil 3 passes from the first end 3x between the coil axis AX and the main surface 2a, between the coil axis AX and the end surface 2f, between the coil axis AX and the main surface 2b, and between the coil axis AX and the end surface 2e, in this order, repeatedly, before reaching the second end 3y. The coil 3 passes from the second end 3y between the coil axis AX and the main surface 2a, between the coil axis AX and the end surface 2e, between the coil axis AX and the main surface 2b, and between the coil axis AX and the end surface 2f, in this order, repeatedly, before reaching the first end 3x.

[0028] The coil 3 has a ring shape when viewed from direction D1. The coil 3 has a pentagonal shape when viewed from direction D1. 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 end surface 2f, third and fourth sides closest to the main surface 2a, and a fifth side closest to the end 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 each longer than the third and fourth sides.

[0029] The first side extends parallel to direction D2. The second side is inclined with respect to direction D3 so as to move away from end face 2f as it approaches the third side from the first side. The third side is inclined with respect to direction D2 so as to move closer to main face 2a as it approaches the fourth side from the second side. The fourth side is inclined with respect to direction D2 so as to move away from main face 2a as it approaches the fifth side from the third side. The fifth side is inclined with respect to direction D3 so as to move closer to end face 2e as it approaches the first side from the fourth side.

[0030] The coil 3 has coil portions 3a, 3b, 3e, and 3f. Coil portion 3a and coil portion 3b face each other in direction D3. Coil portion 3a is disposed closer to main surface 2a and includes the third and fourth sides mentioned above. Coil portion 3a extends between coil axis AX and main surface 2a. Coil portion 3b is disposed closer to main surface 2b and includes the first side mentioned above. Coil portion 3b extends between coil axis AX and main surface 2b. Coil portions 3e and 3f face each other in direction D2. Coil portion 3e is disposed closer to end surface 2e and includes the fifth side mentioned above. Coil portion 3e extends between coil axis AX and end surface 2e. Coil portion 3f is disposed closer to end surface 2f and includes the second side mentioned above. Coil portion 3f extends between coil axis AX and end surface 2f.

[0031] Each of the coil portions 3a and 3b is adjacent to the coil portion 3e and the coil portion 3f. Each of the coil portions 3a and 3b connects the coil portion 3e and the coil portion 3f. Each of the coil portions 3e and 3f is adjacent to the coil portion 3a and the coil portion 3b. Each of the coil portions 3e and 3f connects the coil portion 3a and the coil portion 3b.

[0032] 4, the coil 3 has a plurality of coil conductors 31 to 37 and a plurality of through-hole conductors T1 to T6. The plurality of coil conductors 31 to 37 are electrically connected to one another by the plurality of through-hole conductors T1 to T6. The coil 3 has, for example, five or more coil conductors and four or more through-hole conductors.

[0033] As shown in Figures 3 and 4, the connecting conductor 51 electrically connects the first end 3x of the coil 3 to the external electrode 41. The first end 3x of the coil 3 and the external electrode 41 are physically connected to each other via the connecting conductor 51. The connecting conductor 51 extends from the electrode portion 41a toward the main surface 2a and is connected to the first end 3x. The connecting conductor 52 electrically connects the second end 3y of the coil 3 to the external electrode 42. The second end 3y of the coil 3 and the external electrode 42 are physically connected to each other via the connecting conductor 52. The connecting conductor 52 extends from the electrode portion 42a toward the main surface 2a and is connected to the second end 3y.

[0034] In this embodiment, the lamination direction of the laminated coil component 1 is along direction D1. Fig. 4 shows the multiple layers constituting the laminated coil component 1 as viewed from direction D1. The multiple layers constituting the laminated coil component 1 include an insulator layer 20, coil conductors 31 to 37, through-hole conductors T1 to T6, layers constituting the external electrodes 41 and 42, and connecting conductors 51 and 52. Of the multiple layers constituting the laminated coil component 1, Fig. 4 shows seven layers including the coil conductors 31 to 37, and omits the remaining layers.

[0035] The external electrodes 41 and 42 are each composed of a plurality of stacked electrode layers 410 and 420. 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 made 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 made of a sintered body of a conductive paste containing a powder of a conductive material.

[0036] The connecting conductors 51, 52 are provided in recesses formed in the corresponding insulator layers 20. The connecting conductors 51, 52 are made of, for example, the same material as the electrode layers 410, 420. The connecting conductors 51, 52 are made of, for example, a sintered body of conductive paste. The coil conductors 31 to 37 are provided in recesses formed in the corresponding insulator layers 20. The coil conductors 31 to 37 are made of, for example, the same material as the electrode layers 410, 420. The coil conductors 31 to 37 are made of, for example, a sintered body of conductive paste.

[0037] The coil conductors 31 to 37 form part of the circular track of the coil 3. For example, the coil conductors 31 to 37 have a shape in which part of the loop is interrupted. The coil conductors 31 to 37 each have a path length and a thickness. The path length of each of the coil conductors 31 to 37 is, for example, 80% or more of the length of one turn of the coil 3. In other words, the gap between both ends of each of the coil conductors 31 to 37 is, for example, less than 20% of the length of one turn of the coil 3.

[0038] The coil conductors 31 to 37 have the same width. The width is the length of the coil conductors 31 to 37 in a direction perpendicular to the direction D1 and perpendicular to the paths of the coil conductors 31 to 37. The coil conductors 31 to 37 have the same thickness. The thickness is the length of the coil conductors 31 to 37 in the direction D1. Each layer of the coil conductors 31 to 37 corresponds to each layer constituting the laminated coil component 1. Each layer 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, each layer of the coil conductors 31 to 37 extends along the direction D2 and the direction D3.

[0039] The coil conductors 31 to 37 are arranged in that order in the direction D1. The coil conductor 31 includes the first end 3x of the coil 3. The coil conductor 31 is connected to the electrode portion 41a of the external electrode 41 by the connecting conductor 51. The connecting conductor 51 is connected to the electrode portion 41a at a position closer to the main surface 2a than to the main surface 2b in the direction D3. The coil conductor 31 is included in the same layer as the connecting conductor 51. The coil conductor 31 is adjacent to the outer layer 21 in the direction D1.

[0040] The coil conductor 37 includes the second end 3y of the coil 3. The coil conductor 37 is connected to the electrode portion 42a of the external electrode 42 by a connecting conductor 52. The connecting conductor 52 is connected to the electrode portion 42a at a position closer to the principal surface 2a than to the principal surface 2b in the direction D3. The coil conductor 37 is included in the same layer as the connecting conductor 52. The coil conductor 37 is adjacent to the outer layer 22 in the direction D1.

[0041] Coil conductors 31 and 32 are provided on a portion of coil portion 3e and over the entire lengths of coil portions 3a, 3f, and 3b, respectively. Coil conductors 33 to 35 are provided on a portion of coil portion 3b and over the entire lengths of coil portions 3e, 3a, and 3f, respectively. Coil conductors 36 and 37 are provided on a portion of coil portion 3f and over the entire lengths of coil portions 3e, 3a, and 3b, respectively.

[0042] The through-hole conductors T1 to T6 are provided in six of the multiple layers constituting the multilayer coil component 1, which are arranged between the seven layers including the coil conductors 31 to 37. The through-hole conductor T1 extends in the direction D1 and connects the ends of the coil conductors 31 and 32. The through-hole conductor T2 extends in the direction D1 and connects the ends of the coil conductors 32 and 33. The through-hole conductor T3 extends in the direction D1 and connects the ends of the coil conductors 33 and 34. The through-hole conductor T4 extends in the direction D1 and connects the ends of the coil conductors 34 and 35. The through-hole conductor T5 extends in the direction D1 and connects the ends of the coil conductors 35 and 36. The through-hole conductor T6 extends in the direction D1 and connects the ends of the coil conductors 36 and 37.

[0043] When viewed from direction D1, the through-hole conductors T1 to T6 are spaced apart from one another and arranged in this order along the path of the coil 3. The through-hole conductor T1 is located in the coil portion 3e. The through-hole conductors T2 to T5 are located in the coil portion 3b. The through-hole conductor T6 is located in the coil portion 3f.

[0044] The number of through-hole conductors T1 to T6 arranged closer to the main surface 2b than the center of the element body 2 in the direction D3 is greater than the number of the other through-hole conductors. In this embodiment, all of the through-hole conductors T1 to T6 are arranged closer to the main surface 2b than the center of the element body 2 in the direction D3. That is, the distance in the direction D3 between each of the through-hole conductors T1 to T6 and the main surface 2a is longer than half the length of the element body 2 in the direction D3. The number of through-hole conductors T1 to T6 arranged closer to the main surface 2b than the external electrodes 41, 42 may be greater than the number of the other through-hole conductors. In this embodiment, all of the through-hole conductors T1 to T6 are arranged closer to the main surface 2b than the external electrodes 41, 42. That is, the distance in the direction D3 between each of the through-hole conductors T1 to T6 and the main surface 2b is shorter than the distance in the direction D3 between the external electrodes 41, 42 and the main surface 2b.

[0045] FIG. 5 is a plan view of a laminated coil component according to a comparative example. The laminated coil component 100 according to the comparative example shown in FIG. 5 differs from the laminated coil component 1 shown in FIG. 3 in the shapes of the coil 3 and the connecting conductors 51 and 52. In the laminated coil component 100, all of the through-hole conductors T1 to T6 are arranged closer to the main surface 2a than the center of the element body 2 in the direction D3. In contrast, in the laminated coil component 1, all of the through-hole conductors T1 to T6 are arranged closer to the main surface 2b than the center of the element body 2 in the direction D3. This allows the through-hole conductors T1 to T6 to be spaced apart from the external electrodes 41 and 42. This reduces the stray capacitance generated between the through-hole conductors T1 to T6 and the external electrodes 41 and 42. As a result, the stray capacitance between the coil 3 and the external electrodes 41 and 42 can be reduced.

[0046] In the laminated coil component 100, the connecting conductor 51 extends from the external electrode 41 toward the principal surface 2b and is connected to the first end 3x of the coil 3. The connecting conductor 52 extends from the external electrode 42 toward the principal surface 2b and is connected to the second end 3y of the coil 3. The coil 3 is wound clockwise around the coil axis AX when viewed from the side surface 2c. The coil 3 extends from the first end 3x between the coil axis AX and the principal surface 2b and between the coil axis AX and the end face 2f. The coil 3 extends from the second end 3y between the coil axis AX and the principal surface 2b and between the coil axis AX and the end face 2e.

[0047] In contrast, in the laminated coil component 1, the connecting conductor 51 is drawn from the external electrode 41 toward the principal surface 2a and connected to the first end 3x of the coil 3. The connecting conductor 52 is drawn from the external electrode 42 toward the principal surface 2a and connected to the second end 3y of the coil 3. The coil 3 is wound counterclockwise around the coil axis AX when viewed from the side surface 2c. The coil 3 extends from the first end 3x between the coil axis AX and the principal surface 2a and between the coil axis AX and the end face 2f. The coil 3 extends from the second end 3y between the coil axis AX and the principal surface 2a and between the coil axis AX and the end face 2e.

[0048] In the laminated coil component 1, the coil 3 is wound in this manner, so that the through-hole conductors T1 to T6 can be arranged closer to the main surface 2b than the center of the element body 2 in the direction D3 without reducing the number of turns of the coil 3, as compared to a laminated coil component 1A according to a modified example described later (see FIG. 6).

[0049] In the laminated coil component 1, the external electrodes 41, 42 have an L-shaped cross section when viewed from the direction D1. The electrode portions 41a, 42a are provided on the end faces 2e, 2f near the main surface 2a. Therefore, by arranging the through-hole conductors T1 to T6 closer to the main surface 2b than the center of the element body 2 in the direction D3, the stray capacitance between the through-hole conductors T1 to T6 and the electrode portions 41a, 42a can be reduced. The electrode portions 41b, 42b are provided on the main surface 2a. Therefore, by arranging the through-hole conductors T1 to T6 closer to the main surface 2b than the center of the element body 2 in the direction D3, the stray capacitance between the through-hole conductors T1 to T6 and the electrode portions 41b, 42b can be reduced. Therefore, the stray capacitance between the coil 3 and the external electrodes 41, 42 can be reduced.

[0050] In the laminated coil component 1, the external electrodes 41, 42 are embedded in the element body 2. For this reason, the through-hole conductors T1 to T6 tend to be close to the external electrodes 41, 42. Therefore, a configuration that can separate the through-hole conductors T1 to T6 from the external electrodes 41, 42 is particularly effective in suppressing stray capacitance between the coil 3 and the external electrodes 41, 42.

[0051] FIG. 6 is a plan view of a laminated coil component according to a modified example. A laminated coil component 1A according to a modified example shown in FIG. 6 differs from the laminated coil component 1 shown in FIG. 3 in the shapes of the coil 3 and the connecting conductors 51 and 52. The connecting conductors 51 and 52 of the laminated coil component 1A have the same shapes as the connecting conductors 51 and 52 of the laminated coil component 100 shown in FIG. 5. Like the coil of the laminated coil component 100, the coil 3 of the laminated coil component 1A is also wound clockwise around the coil axis AX when viewed from the side surface 2c. The through-hole conductor T1 is arranged in the coil portion 3f. The through-hole conductors T2 to T5 are arranged in the coil portion 3b. The through-hole conductor T6 is arranged in the coil portion 3e.

[0052] In the laminated coil component 1A, the path length of each of the coil conductors 32 to 36 is, for example, 80% or more of the length of one turn of the coil 3. In contrast, the path length of the coil conductor 31 is set to be short, for example, less than 50% of the length of one turn of the coil 3. As a result, all of the through-hole conductors T1 to T6 are arranged closer to the main surface 2b than the center of the element body 2 in the direction D3. Therefore, in the laminated coil component 1A, similar to the laminated coil component 1, it is possible to suppress stray capacitance generated between the through-hole conductors T1 to T6 and the external electrodes 41, 42.

[0053] Second Embodiment The configuration of a laminated coil component 1B according to a second embodiment will be described with reference to FIGS. 7 to 9. FIG. 7 is a perspective view of the laminated coil component according to the second embodiment. FIG. 8 is a plan view of the laminated coil component of FIG. 7, seen from the side surface 2c. In FIG. 8, the element body 2 is indicated by a dashed line. FIG. 9 is an exploded view of the laminated coil component of FIG. 7. The laminated coil component 1B according to this embodiment differs from the laminated coil component 1 in that it includes a coil 3B, external electrodes 41B and 42B, and connecting conductors 51B and 52B, instead of the coil 3, external electrodes 41 and 42, and connecting conductors 51 and 52. The following description of the laminated coil component 1B will focus on the differences from the laminated coil component 1.

[0054] The external electrodes 41B and 42B have the same shape as the electrode portions 41b and 42b of the external electrodes 41 and 42. That is, the external electrodes 41B and 42B have a shape obtained by removing the electrode portions 41a and 42a from the external electrodes 41 and 42. The external electrodes 41B and 42B are rectangular plates with their thickness direction aligned in direction D3. When viewed from direction D1, the external electrodes 41 and 42 have a rectangular cross section with their long sides aligned in direction D2.

[0055] The external electrodes 41B and 42B are disposed on the main surface 2a. The external electrodes 41B and 42B are so-called bottom electrodes. The external electrodes 41B and 42B are embedded in the element body 2 so as to be exposed from at least the main surface 2a. In this embodiment, the external electrode 41B is embedded in the element body 2 so as to be exposed from the end face 2e and the main surface 2a. The external electrode 42B is embedded in the element body 2 so as to be exposed from the end face 2f and the main surface 2a. The surface of the external electrode 41B may be located on the same plane as the end face 2e and the main surface 2a, or may protrude from the end face 2e and the main surface 2a. The surface of the external electrode 42B may be located on the same plane as the end face 2f and the main surface 2a, or may protrude from the end face 2f and the main surface 2a.

[0056] Coil 3B differs from coil 3 in that it has a rectangular shape when viewed from direction D1. The rectangle includes a first side located closest to main surface 2b, a second side located closest to end surface 2f, a third side located closest to main surface 2a, and a fourth side located closest to end surface 2e. The first and third sides are long sides of the rectangle and extend parallel to direction D2. The second and fourth sides are short sides of the rectangle and extend parallel to direction D3. 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, and the fourth side is connected to the first side at a fourth vertex.

[0057] In coil 3B, coil portion 3a includes the third side and extends between coil axis AX and main surface 2a. Coil portion 3b includes the first side and extends between coil axis AX and main surface 2b. Coil portion 3e includes the fourth side and extends between coil axis AX and end surface 2e. Coil portion 3f includes the second side and extends between coil axis AX and end surface 2f.

[0058] Like coil 3, coil 3B is wound counterclockwise around coil axis AX when viewed from side surface 2c. Coil 3B extends from a first end 3x between coil axis AX and main surface 2a to between coil axis AX and end surface 2f. Coil 3 extends from a second end 3y between coil axis AX and main surface 2a to between coil axis AX and end surface 2e.

[0059] In coil 3B, coil conductors 31 and 32 are provided on a portion of coil portion 3e and over the entire lengths of coil portions 3a, 3b, and 3f, respectively. Coil conductors 33 to 35 are provided on a portion of coil portion 3b and over the entire lengths of coil portions 3a, 3e, and 3f, respectively. Coil conductors 36 and 37 are provided on a portion of coil portion 3f and over the entire lengths of coil portions 3a, 3b, and 3e, respectively.

[0060] The connecting conductors 51B and 52B differ from the connecting conductors 51 and 52 in that they extend linearly along direction D3. The connecting conductor 51B extends linearly from the external electrode 41B along direction D1 and is connected to the first end 3x. The first end 3x is located at the third vertex. The connecting conductor 52B extends linearly from the external electrode 42B along direction D1 and is connected to the second end 3y. The second end 3y is located at the second vertex.

[0061] In coil 3B, all of the through-hole conductors T1 to T6 are also arranged closer to main surface 2b than the center of element body 2 in direction D3. That is, the shortest distance in direction D3 between each of through-hole conductors T1 to T6 and main surface 2a is longer than half the length of element body 2 in direction D3. Through-hole conductor T1 is arranged in coil portion 3e. Through-hole conductors T2 to T5 are arranged in coil portion 3b. Through-hole conductor T6 is arranged in coil portion 3f.

[0062] As described above, in the laminated coil component 1B as well, the through-hole conductors T1 to T6 are all arranged closer to the main surface 2b than the center of the element body 2 in the direction D3. This makes it possible to suppress stray capacitance generated between the through-hole conductors T1 to T6 and the external electrodes 41, 42. The coil 3B also extends from the first end 3x between the coil axis AX and the main surface 2a and between the coil axis AX and the end face 2f. Because the coil 3B is wound in this manner in the laminated coil component 1B as well, the through-hole conductors T1 to T6 can be arranged closer to the main surface 2b than the center of the element body 2 in the direction D3 without reducing the number of turns of the coil 3B.

[0063] Although the embodiments have been described above, the present invention is not necessarily limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the present invention. The above-described embodiments and modifications may be combined as appropriate.

[0064] In the laminated coil components 1, 1A, and 1B, the outer layers 21 and 22 have high rigidity, but may have the same rigidity as the other insulator layers 20. In the laminated coil components 1 and 1A, the connecting conductor 51 may be connected to the coil portion 3a via the coil portion 3e, and the connecting conductor 52 may be connected to the coil portion 3a via the coil portion 3f. The connecting conductor 51 may be connected to the electrode portion 41a at a position closer to the principal surface 2b than to the principal surface 2a in the direction D3. The connecting conductor 52 may be connected to the electrode portion 42a at a position closer to the principal surface 2b than to the principal surface 2a in the direction D3.

[0065] In the laminated coil components 1, 1A, and 1B, less than half of the through-hole conductors T1 to T6 may be arranged closer to the main surface 2a than the center of the element body 2 in the direction D3. [Explanation of symbols]

[0066] 1, 1A, 1B, 100... multilayer coil component, 2... element body, 2a, 2b... main surface, 2c, 2d... side surface, 2e, 2f... end surface, 3, 3B... coil, 3a, 3b, 3e, 3f... coil portion, 3x... first end, 3y... second end, 31 to 37... coil conductor, 41, 41B, 42, 42B... external electrode, 41a, 41b, 42a, 41b... electrode portion, AX... coil axis, D1, D2, D3... direction.

Claims

1. an element body having a first main surface and a second main surface facing each other, a first end surface and a second end surface facing each other, and a first side surface and a second side surface facing each other; a first external electrode and a second external electrode disposed on the first main surface; a coil having a first end connected to the first external electrode and a second end connected to the second external electrode; Equipped with a coil axis of the coil extends along a direction in which the first side surface and the second side surface face each other; the coil includes a plurality of coil conductors and through-hole conductors connecting the plurality of coil conductors to each other; the number of the through-hole conductors arranged closer to the second main surface than the center of the element body in the opposing direction of the first main surface and the second main surface is greater than the number of the other through-hole conductors; Multilayer coil components.

2. all of the through-hole conductors are arranged closer to the second main surface than the center of the element body in the opposing direction of the first main surface and the second main surface; The laminated coil component according to claim 1 .

3. The coil extends from the first end, passing between the coil axis and the first main surface, and reaching between the coil axis and the second end surface. The laminated coil component according to claim 1 or 2.

4. Each of the first external electrode and the second external electrode has a first electrode portion provided on the first end surface and a second electrode portion provided on the first main surface. The laminated coil component according to claim 1 or 2.

5. the first external electrode and the second external electrode are each embedded in the element body so as to be exposed from the first main surface; The laminated coil component according to claim 1 or 2.

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