Coil component and manufacturing method thereof

Abstract

To provide a coil component and a manufacturing method thereof that can adjust inductance.SOLUTION: According to a coil component 10 and a manufacturing method thereof, in a process of stacking a first layer L1 and a second layer L2, the relative stacking position of the first layer L1 and the second layer L2, i.e., the relative position of a first coil conductor 20 and a second coil conductor 30, can be appropriately determined, thereby obtaining the desired inductance.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to a coil component and a method for manufacturing the same. [Background technology]

[0002] Patent Document 1 below discloses a coil component having a coil configured in multiple layers, with each layer provided with a coil conductor that forms part of the coil. When a voltage is applied to the coil component, the ends of adjacent coil conductors in the vertical direction are connected to each other via through-hole conductors so that current flows in the coil conductors in the same circumferential direction (for example, clockwise in a plan view). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-172831 [Patent Document 2] Japanese Patent Application Laid-Open No. 2001-274021 [Patent Document 3] Japanese Patent Application Laid-Open No. 2003-109821 Summary of the Invention [Problem to be solved by the invention]

[0004] The inventors have conducted extensive research into the inductance of coil components, and as a result have discovered a new technique for adjusting inductance.

[0005] An object of one aspect of the present disclosure is to provide a coil component capable of adjusting inductance and a method for manufacturing the same. [Means for solving the problem]

[0006] A method for manufacturing a coil component according to one aspect of the present disclosure includes a first layer having a first coil conductor on its main surface that forms part of the coil and that includes a first connection portion, and a second layer having a second coil conductor on its main surface that forms part of the coil and that includes a second connection portion and that has a through-hole conductor passing through it connecting the first connection portion and the second connection portion, overlapping the first layer in a first direction, wherein the first connection portion is larger than the second connection portion when viewed from the first direction, and includes a step of stacking the first layer and the second layer, and in the step of stacking the first layer and the second layer, the relative stacking positions of the first layer and the second layer are determined according to the desired inductance.

[0007] In the above-described method for manufacturing a coil component, the inductance of the coil can be adjusted by determining the relative lamination positions of the first layer and the second layer and laminating them so as to obtain a desired inductance.

[0008] A coil component according to one aspect of the present disclosure comprises a base body including a first layer having a first coil conductor on its main surface that forms part of the coil and that includes a first connection portion, and a second layer having a second coil conductor on its main surface that forms part of the coil and that includes a second connection portion, and having a through-hole conductor passing through it that connects the first connection portion and the second connection portion, overlapping the first layer in a first direction; wherein the first connection portion is larger than the second connection portion when viewed from the first direction, and the contact area of ​​the through-hole conductor with the second connection portion is larger than the contact area of ​​the first connection portion.

[0009] In the coil component, the inductance of the coil can be adjusted by laminating the first layer and the second layer in the relative lamination positions so as to obtain a desired inductance. [Effects of the Invention]

[0010] According to various aspects of the present disclosure, a coil component capable of adjusting inductance and a method for manufacturing the same are provided. [Brief explanation of the drawings]

[0011] [Figure 1]FIG. 1 is a schematic perspective view showing a coil component according to one embodiment. [Figure 2] FIG. 2 is a schematic exploded perspective view showing the configuration of a coil included in the coil component of FIG. [Figure 3] FIG. 3 is a schematic plan view showing the configurations of the first coil conductor and the second coil conductor included in the coil component of FIG. [Figure 4] FIG. 4 is a schematic cross-sectional view showing the laminated structure of the coil device of FIG. [Figure 5] FIG. 5 is a diagram showing one step of a method for manufacturing the coil component of FIG. [Figure 6] 6(a) and 6(b) are diagrams each showing one relative positional relationship between the first coil conductor and the second coil conductor. [Figure 7] 7(a) and 7(b) are diagrams showing one relative positional relationship between the first coil conductor and the second coil conductor. [Figure 8] 8(a) and 8(b) are diagrams showing first coil conductors with different shapes. [Figure 9] 9(a) to 9(c) are diagrams showing first coil conductors of different shapes. [Figure 10] 10(a) and 10(b) are diagrams showing first coil conductors with different shapes. DETAILED DESCRIPTION OF THE INVENTION

[0012] Various embodiments and examples will be described below with reference to the drawings. Note that the same or equivalent parts in each drawing are designated by the same reference numerals, and redundant explanations will be omitted.

[0013] The structure of a coil component according to one embodiment will be described with reference to Figures 1 to 3. For convenience of explanation, an XYZ coordinate system is set as shown in the figures. That is, the thickness direction of the coil component is set as the Z direction (first direction), the facing direction of the external terminal electrodes is set as the X direction, and the direction perpendicular to the Z direction and the X direction is set as the Y direction.

[0014] A coil component 10 according to this embodiment is configured to include an element body 12 and a pair of external terminal electrodes 14A, 14B provided on the surface of the element body 12. In this embodiment, the coil component 10 has a rectangular parallelepiped outer shape.

[0015] The element body 12 has a rectangular parallelepiped outer shape and has a pair of end faces 12a, 12b facing each other in the X direction, a pair of main faces 12c, 12d facing each other in the Z direction, and a pair of side faces 12e, 12f facing each other in the Y direction. The element body 12 has a layered structure, with multiple layers stacked in the Z direction (stacking direction).

[0016] A coil 15 having a coil axis parallel to the Z direction is provided inside the element body 12. The coil 15 includes multiple coil conductors 20, 30 provided between layers. In this embodiment, the coil 15 includes a first coil conductor 20 provided on the main surface of a first layer L1 constituting the element body 12 and a second coil conductor 30 provided on the main surface of a second layer L2 constituting the element body 12. In the element body 12, the first layer L1 and the second layer L2 are alternately stacked, and the first coil conductor 20 on the first layer L1 and the second coil conductor 30 on the second layer L2 are connected via a through-hole conductor 40 that penetrates the second layer L2. One end of the coil 15 is extended to an end surface 12a of the element body 12 via a lead conductor (not shown), and the other end of the coil 15 is extended to an end surface 12b of the element body 12 via a lead conductor (not shown).

[0017] 3, the first coil conductor 20 and the second coil conductor 30 are generally L-shaped and have substantially the same shape and dimensions. When viewed in the Z direction, the first coil conductor 20 and the second coil conductor 30 are rotationally symmetrical by 180 degrees about the center Z0 of the layers L1 and L2. When viewed in the Z direction, the first coil conductor 20 and the second coil conductor 30 form the outer shape of the generally rectangular coil 15 and define the inner diameter S of the generally rectangular coil 15.

[0018] The first coil conductor 20 has a first wire portion 21 that extends along the X direction and corresponds to the short sides of the coil 15, and a second wire portion 22 that extends along the Y direction and corresponds to the long sides of the coil 15. The length of the second wire portion 22 is longer than the length of the first wire portion 21. The length of the second wire portion 22 may be the same as or shorter than the length of the first wire portion 21. The end portion 20a of the first coil conductor 20 on the first wire portion 21 side is provided in the form of an electrode pad P1 (first connection portion), and the end portion 20b on the second wire portion 22 side is provided in the form of an electrode pad P2 (third connection portion). Similarly, the second coil conductor 30 has a first wire portion 31 that extends along the X direction and corresponds to the short sides of the coil 15, and a second wire portion 32 that extends along the Y direction and corresponds to the long sides of the coil 15. The length of the second wire portion 32 is longer than the length of the first wire portion 31. The length of the second wire portion 32 may be the same as or shorter than the length of the first wire portion 31. The end 30a of the second coil conductor 30 on the first wire portion 31 side is provided in the form of an electrode pad P3, and the end 30b on the second wire portion 32 side is provided in the form of an electrode pad P4 (second connection portion). In this embodiment, when viewed from the stacking direction, each of the electrode pads P1 to P4 has a quadrilateral shape (approximately square) with sides parallel to each side of the rectangular coil 15, and more specifically, a quadrilateral with all corners rounded.

[0019] 3, the electrode pad P1 of the first coil conductor 20 overlaps with the electrode pad P4 of the second coil conductor 30 at one corner of the rectangle. The electrode pad P2 of the first coil conductor 20 overlaps with the electrode pad P3 of the second coil conductor 30 at a corner diagonally opposite the corner where the electrode pad P1 of the first coil conductor 20 and the electrode pad P4 of the second coil conductor 30 overlap.

[0020] As shown in FIG. 4, the electrode pad P1 of the first coil conductor 20 and the electrode pad P4 of the second coil conductor 30 are connected to each other via a through-hole conductor 40 that penetrates a region of the second layer L2 corresponding to the region where the electrode pad P4 is formed. The through-hole conductor 40 is composed of a through hole 41 and a conductor 42 filled in the through hole 41. In this embodiment, the opening of the through hole 41 on one main surface (the upper surface in FIG. 4) on which the second coil conductor 30 is provided has different dimensions from the opening on the other main surface (the lower surface in FIG. 4), and the inner surface is inclined so that the opening on the upper surface has a larger dimension. Specifically, the inner surface of the through hole 41 has a truncated cone shape, and the conductor 42 filled in the through hole 41 also has a truncated cone shape. Therefore, when viewed from the stacking direction, the contact area of ​​the through-hole conductor 40 with the electrode pad P4 is larger than the contact area of ​​the electrode pad P1 with the electrode pad P1. The conductor 42 of the through-hole conductor 40 extending through the second layer L2 and the electrode pad P4 of the second coil conductor 30 may be integrally formed.

[0021] As shown in FIG. 3 , the dimensions of the electrode pad P1 of the first coil conductor 20 are designed to be larger than the dimensions of the electrode pad P4 of the second coil conductor 30 when viewed in the stacking direction. Specifically, when viewed in the stacking direction, the lengths of all four sides of the rectangular outer shape of the electrode pad P1 of the first coil conductor 20 are longer than the lengths of all four sides of the rectangular outer shape of the electrode pad P4 of the second coil conductor 30. The area of ​​the electrode pad P1 of the first coil conductor 20 is also larger than the area of ​​the electrode pad P4 of the second coil conductor 30. The electrode pad P4 of the second coil conductor 30 is overlapped with the electrode pad P1 of the first coil conductor 20 so that the entire electrode pad P4 is included in the formation area of ​​the electrode pad P1. The electrode pad P1 of the first coil conductor 20 significantly extends beyond the rectangular annular formation area of ​​the coil 15 when viewed in the stacking direction. As long as the electrode pad P1 and the electrode pad P4 can be electrically connected via the through-hole conductors 40, the electrode pad P4 may be only partially included in the formation area of ​​the electrode pad P1.

[0022] Similarly, the electrode pad P2 of the first coil conductor 20 and the electrode pad P3 of the second coil conductor 30 are connected to each other via a through-hole conductor 40 that penetrates through a region of the first layer L1 corresponding to the region where the electrode pad P2 is formed. When viewed from the stacking direction, the contact area of ​​the through-hole conductor 40 with the electrode pad P2 is larger than the contact area of ​​the through-hole conductor 40 with the electrode pad P3. The conductor 42 of the through-hole conductor 40 that penetrates through the first layer L1 and the electrode pad P2 of the first coil conductor 20 may be integrally formed.

[0023] As shown in FIG. 3 , the dimensions of the electrode pads P3 of the second coil conductor 30 are designed to be larger than the dimensions of the electrode pads P2 of the first coil conductor 20 when viewed in the stacking direction. Specifically, when viewed in the stacking direction, the lengths of all four sides of the rectangular outer shape of the electrode pads P3 of the second coil conductor 30 are longer than the lengths of all four sides of the rectangular outer shape of the electrode pads P2 of the first coil conductor 20. The area of ​​the electrode pads P3 of the second coil conductor 30 is also larger than the area of ​​the electrode pads P2 of the first coil conductor 20. The electrode pads P2 of the first coil conductor 20 are overlapped with the electrode pads P3 so that the entire electrode pads P2 are included in the formation area of ​​the electrode pads P3 of the second coil conductor 30. The electrode pads P3 of the second coil conductor 30 significantly extend beyond the rectangular annular formation area of ​​the coil 15 when viewed in the stacking direction. As long as the electrode pads P2 and P3 can be electrically connected via the through-hole conductors 40, the electrode pads P2 may be only partially included in the formation area of ​​the electrode pads P3.

[0024] In this embodiment, the first coil conductor 20 and the second coil conductor 30 have substantially the same shape and dimensions, so the dimensions of the electrode pad P1 of the first coil conductor 20 are larger than the dimensions of the electrode pad P2, and the dimensions of the electrode pad P3 of the second coil conductor 30 are larger than the dimensions of the electrode pad P4.

[0025] A pair of external terminal electrodes 14A, 14B are provided on a pair of end faces 12a, 12b, respectively. Each external terminal electrode 14A, 14B may be composed of one or more electrode layers. In this embodiment, the external terminal electrode 14A integrally covers the entire end face 12a, as well as the main faces 12c, 12d, and side faces 12e, 12f in the area adjacent to the end face 12a. The external terminal electrode 14A is electrically connected to one end of the coil 15 exposed at the end face 12a of the element body 12. Similarly, the external terminal electrode 14B integrally covers the entire end face 12b, as well as the main faces 12c, 12d, and side faces 12e, 12f in the area adjacent to the end face 12b. The external terminal electrode 14B is electrically connected to the other end of the coil 15 exposed at the end face 12b of the element body 12.

[0026] Next, a method for manufacturing the above-described coil device 10 will be described with reference to FIGS.

[0027] When manufacturing the coil component 10, a plurality of sheets to become the first layer L1 and a plurality of sheets to become the second layer L2, which constitute a part of the element body 12, are prepared. The sheet to become the first layer L1 is provided with one or more first coil conductors 20. When a plurality of first coil conductors 20 are provided, the plurality of first coil conductors 20 can be arranged in a matrix to provide high density. The sheet to become the first layer L1 is provided with through-hole conductors 40 penetrating the first coil conductors 20 in areas corresponding to areas where the electrode pads P2 are formed. Similarly, the sheet to become the second layer L2 is provided with one or more second coil conductors 30. When a plurality of second coil conductors 30 are provided, the plurality of second coil conductors 30 can be arranged in a matrix to provide high density. The sheet to become the second layer L2 is provided with through-hole conductors 40 penetrating the second coil conductors 30 in areas corresponding to areas where the electrode pads P3 are formed.

[0028] Then, the sheet to become the first layer L1 and the sheet to become the second layer L2 are laminated together. For ease of explanation, Fig. 5 shows the state in which the first layer L1 and the second layer L2 are laminated together, rather than the form of sheets. Fig. 5 shows the state in which the second layer L2 is laminated on the first layer L1 from above, but it may also be the state in which the first layer L1 is laminated on the second layer L2 from below.

[0029] When the first layer L1 and the second layer L2 are laminated, they can be laminated in various relative positions as shown in FIGS.

[0030] In the relative positions of the first coil conductor 20 and the second coil conductor 30 shown in FIG. 6(a), the inner diameter S of the coil 15 is at its maximum. At this time, the first wire portion 21 of the first coil conductor 20 and the first wire portion 31 of the second coil conductor 30 are farthest apart in the X direction, and the second wire portion 22 of the first coil conductor 20 and the second wire portion 32 of the second coil conductor 30 are farthest apart in the Y direction. The electrode pad P4 of the second coil conductor 30 is located in a corner of the area where the electrode pad P1 of the first coil conductor 20 is formed (the lower right corner in FIG. 6(a)), and the electrode pad P2 of the first coil conductor 20 is located in a corner of the area where the electrode pad P3 of the second coil conductor 30 is formed (the upper left corner in FIG. 6(a)). In the relative positions of the first coil conductor 20 and the second coil conductor 30 shown in FIG. 6(b), the inner diameter S of the coil 15 is at its minimum. At this time, the first wire portion 21 of the first coil conductor 20 and the first wire portion 31 of the second coil conductor 30 are closest in the X direction, and the second wire portion 22 of the first coil conductor 20 and the second wire portion 32 of the second coil conductor 30 are closest in the Y direction. The electrode pad P4 of the second coil conductor 30 is located in a corner (the upper left corner in FIG. 6(b)) of the area where the electrode pad P1 of the first coil conductor 20 is formed, and the electrode pad P2 of the first coil conductor 20 is located in a corner (the lower right corner in FIG. 6(b)) of the area where the electrode pad P3 of the second coil conductor 30 is formed.

[0031] 7(a) and 7(b) show states in which the relative positions of the first coil conductor 20 and the second coil conductor 30 are changed in the diagonal direction D1 in which the corner where the electrode pad P1 of the first coil conductor 20 and the electrode pad P4 of the second coil conductor 30 overlap is opposed to the corner where the electrode pad P2 of the first coil conductor 20 and the electrode pad P3 of the second coil conductor 30 overlap. In the relative positions of the first coil conductor 20 and the second coil conductor 30 shown in Fig. 7(a), the first wire portion 21 of the first coil conductor 20 and the first wire portion 31 of the second coil conductor 30 are farthest apart in the X direction, and conversely, the second wire portion 22 of the first coil conductor 20 and the second wire portion 32 of the second coil conductor 30 are closest to each other in the Y direction. In the relative positions of the first coil conductor 20 and the second coil conductor 30 shown in Figure 7(b), the first wire portion 21 of the first coil conductor 20 and the first wire portion 31 of the second coil conductor 30 are closest to each other in the X direction, and conversely, the second wire portion 22 of the first coil conductor 20 and the second wire portion 32 of the second coil conductor 30 are farthest apart in the Y direction.

[0032] When the first layer L1 and the second layer L2 are stacked, the relative positions of the first coil conductor 20 and the second coil conductor 30 can also be determined so that the centers of the overlapping electrode pads P1 to P4 overlap with each other, as shown in Figure 3.

[0033] As described above, the first layer L1 and the second layer L2 can be stacked in various relative positions, and the inner diameter S of the coil 15 is determined depending on the relative position. The inductance value of the coil device 10 varies depending on the inner diameter S of the coil 15, and the inductance value increases as the inner diameter S of the coil 15 increases. For example, the configuration shown in FIG. 6(a) has the largest inner diameter S of the coil 15, and therefore can achieve a higher inductance value than the configuration shown in FIG. 6(b), in which the inner diameter S of the coil 15 is smallest. The configurations shown in FIG. 7(a) and FIG. 7(b) have almost the same inner diameter S of the coil 15, and both can achieve approximately the same inductance value. However, the Q value, which is one of the coil characteristics, differs between the configurations shown in FIG. 7(a) and FIG. 7(b). Therefore, from the perspective of the Q value, either the configuration shown in FIG. 7(a) or the configuration shown in FIG. 7(b) can be adopted.

[0034] In addition, the multiple first layers L1 and multiple second layers L2 included in the base body 12 can be stacked in the same relative positional relationship, and some of the first layers L1 and second layers L2 can also be stacked in a different relative positional relationship.

[0035] As described above, according to the coil component 10 and the manufacturing method thereof, in the process of stacking the first layer L1 and the second layer L2, the relative stacking position of the first layer L1 and the second layer L2, i.e., the relative position of the first coil conductor 20 and the second coil conductor 30, can be appropriately determined, thereby obtaining the desired inductance.

[0036] Because the multiple first coil conductors 20 included in the base body of the coil component 10 all have the same shape, the same mask can be used for patterning. Because the multiple second coil conductors 30 included in the base body of the coil component 10 also all have the same shape, the same mask can be used for patterning. When the first coil conductor 20 and the second coil conductor 30 have a rotationally symmetric relationship as shown in FIG. 3 , the second coil conductor 30 can be obtained simply by rotating the first coil conductor 20. This eliminates the need to separately prepare masks for forming the first coil conductor 20 and the second coil conductor 30, thereby further reducing the number of steps and costs involved in producing the coil component 10.

[0037] In the coil component 10, the coil 15 has a rectangular ring shape when viewed in the stacking direction, with the electrode pads P1 to P4 of the first coil conductor 20 and the second coil conductor 30 located at the corners of the rectangle, and the electrode pads P1 to P4 are overlapped and connected at the corners of the rectangle. When the electrode pads P1 to P4 are located at the corners of the rectangle, the pair of electrode pads P1, P4 and the pair of electrode pads P2, P3 are positioned diagonally, ensuring the maximum separation distance in the rectangle. This effectively suppresses short circuits between the electrode pads P1 to P4 on the same layer and stray capacitance caused by facing the electrode pads P1 to P4 in the stacking direction (for example, facing the large electrode pad P1 and electrode pad P3).

[0038] In the coil device 10, the first coil conductor 20 and the second coil conductor 30 can take various relative positions, as shown in Figures 3, 6, and 7. As shown in Figure 7, when the first coil conductor 20 and the second coil conductor 30 are shifted in the diagonal direction D1 (i.e., the direction connecting the electrode pad P1 and the electrode pad P2 when viewed from the stacking direction), the inner diameter S of the coil 15 does not change. The inner diameter S of the coil 15 can be changed by shifting the relative positions of the first coil conductor 20 and the second coil conductor 30 in a direction intersecting the diagonal direction D1 (for example, a direction perpendicular to the diagonal direction D1).

[0039] The shapes of the first coil conductor 20 and the second coil conductor 30 are not limited to those described above, and may be shapes such as those shown in Figures 8 to 10. For ease of explanation, only the shape of the first coil conductor 20 is described in Figures 8 to 10, but the shape of the second coil conductor 30 is also similar.

[0040] The shape of the first coil conductor 20 shown in Fig. 8(a) differs from the shape of the above-described first coil conductor 20 in that the shapes of the electrode pads P1 and P2 are not rectangular with all corners rounded, but rectangular with all corners not rounded but right angles. The shape of the first coil conductor 20 shown in Fig. 8(b) differs from the shape of the above-described first coil conductor 20 in that the shapes of the electrode pads P1 and P2 are circular rather than rectangular.

[0041] The shape of the first coil conductor 20 shown in FIG. 9( a) differs from the shape of the first coil conductor 20 described above in that the electrode pad P1 has a wide I-shaped pad portion 20a1 extending along the Y direction (i.e., the facing direction of the end faces 12a and 12b of the element body 12). In this case, the relative positional relationship between the first coil conductor 20 and the second coil conductor 30 in the Y direction can be adjusted in the process of stacking the first layer L1 and the second layer L2. When the relative positional relationship between the first coil conductor 20 and the second coil conductor 30 is adjusted only in the Y direction, the electrode pad P1 in FIG. 9( a) can reduce pad material compared to the large, square electrode pad P1 described above. Furthermore, by making the electrode pad P1 smaller, the electrode pad P1 is less likely to obstruct the magnetic flux generated at the inner diameter S of the coil 15, thereby increasing the inductance value.

[0042] The shape of the first coil conductor 20 shown in FIG. 9(b) differs from the shape of the first coil conductor 20 described above in that the electrode pad P1 has a wide I-shaped pad portion 20a2 extending along the X direction (i.e., the facing direction of the side surfaces 12e and 12f of the element body 12). In this case, the relative positional relationship between the first coil conductor 20 and the second coil conductor 30 in the X direction can be adjusted in the process of stacking the first layer L1 and the second layer L2. When the relative positional relationship between the first coil conductor 20 and the second coil conductor 30 is adjusted only in the X direction, the electrode pad P1 in FIG. 9(b) can reduce pad material compared to the large, square electrode pad P1 described above. Furthermore, by making the electrode pad P1 smaller, the electrode pad P1 is less likely to obstruct the magnetic flux generated at the inner diameter S of the coil 15, thereby increasing the inductance value.

[0043] The shape of the first coil conductor 20 shown in FIG. 9(c) differs from the shape of the first coil conductor 20 described above in that the electrode pad P1 has a wide T-shape including the pad portions 20a1 and 20a2. In this case, the relative positional relationship between the first coil conductor 20 and the second coil conductor 30 in the X and Y directions can be adjusted in the process of stacking the first layer L1 and the second layer L2. When the relative positional relationship between the first coil conductor 20 and the second coil conductor 30 is adjusted only in the X and Y directions, the electrode pad P1 in FIG. 9(c) can reduce pad material compared to the large, square electrode pad P1 described above. Furthermore, by making the electrode pad P1 smaller, the electrode pad P1 is less likely to obstruct the magnetic flux generated at the inner diameter S of the coil 15, thereby increasing the inductance value.

[0044] The shape of the first coil conductor 20 shown in FIG. 10( a) differs from the shape of the first coil conductor 20 described above in that the electrode pads P1 and P2 do not protrude toward the outer shape of the coil 15 when viewed in the Z direction. More specifically, the electrode pad P1 does not protrude from an extension of the outer shape of the coil 15 defined by the first line portion 21, and the electrode pad P2 does not protrude from an extension of the outer shape of the coil 15 defined by the second line portion 22. The shape of the first coil conductor 20 shown in FIG. 10( b) differs from the shape of the first coil conductor 20 described above in that only the electrode pad P2 does not protrude toward the outer shape of the coil 15 when viewed in the Z direction. More specifically, the electrode pad P2 does not protrude from an extension of the outer shape of the coil 15 defined by the second line portion 22. Each of the electrode pads P1 and P2 may or may not protrude toward the outer shape of the coil 15 when viewed in the Z direction.

[0045] As can be understood from the above description, the present specification discloses the following. [Appendix 1] 1. A method for manufacturing a coil component including: a first layer having a first coil conductor on a main surface, the first coil conductor constituting a part of a coil and including a first connection portion; and a second layer having a second coil conductor on a main surface, the second coil conductor constituting a part of the coil and including a second connection portion, the second layer having a through-hole conductor passing through the second layer and connecting the first connection portion and the second connection portion, the second layer overlapping the first layer in a first direction, the first connection portion being larger than the second connection portion when viewed in the first direction, laminating the first layer and the second layer; A method for manufacturing a coil component, wherein in the step of laminating the first layer and the second layer, the relative lamination positions of the first layer and the second layer are determined according to a desired inductance. [Appendix 2] A method for manufacturing a coil component as described in Appendix 1, wherein the first coil conductor further includes a third connection portion, and when viewed from the first direction, the third connection portion is smaller than the first connection portion. [Appendix 3] A method for manufacturing a coil component described in Appendix 1 or 2, wherein, when viewed from the first direction, the first coil conductor and the second coil conductor define a rectangular coil, and the first connection portion and the second connection portion are arranged at the corners of the rectangle. [Appendix 4] 4. The method for manufacturing a coil component according to any one of claims 1 to 3, wherein, when viewed from the first direction, the contact area of ​​the through-hole conductor with the second connection portion is larger than the contact area of ​​the through-hole conductor with the first connection portion. [Appendix 5] A method for manufacturing a coil component described in any one of Appendices 1 to 4, wherein, when viewed from the first direction, at least one of the first connection portion and the second connection portion has a portion extending outside the coil formation area. [Appendix 6] 6. The method for manufacturing a coil component according to any one of appendices 1 to 5, wherein the coil component includes a plurality of the first coil conductors and a plurality of the second coil conductors. [Appendix 7] 7. The method for manufacturing a coil component according to any one of claims 1 to 6, wherein the first coil conductor and the second coil conductor have a shape that is rotationally symmetric when viewed from the first direction. [Appendix 8] A method for manufacturing a coil component according to any one of appendices 1 to 7, wherein in the step of stacking the first layer and the second layer, the relative stacking positions of the first layer and the second layer are determined with respect to a direction intersecting a direction connecting the first connection portion and the third connection portion when viewed from the first direction. [Appendix 9] an element body including: a first layer having a first coil conductor that constitutes a part of a coil and that includes a first connection portion provided on a main surface thereof; and a second layer having a second coil conductor that constitutes a part of the coil and that includes a second connection portion provided on a main surface thereof, and having a through-hole conductor that connects the first connection portion and the second connection portion passed through the second layer, the second layer overlapping the first layer in a first direction; A coil component in which the first connection portion is larger than the second connection portion when viewed from the first direction, and the contact area of ​​the through-hole conductor with the second connection portion is larger than the contact area of ​​the through-hole conductor with the first connection portion. [Explanation of symbols]

[0046] 10... coil component, 12... element body, 12a, 12b... end faces, 14A, 14B... external terminal electrodes, 15... coil, 20... first coil conductor, 30... second coil conductor, 40... through-hole conductor, L1... first layer, L2... second layer, P1 to P4... electrode pads.

Claims

1. 1. A method for manufacturing a coil component including: a first layer having a first coil conductor on a main surface, the first coil conductor constituting a part of a coil and including a first connection portion; and a second layer having a second coil conductor on a main surface, the second coil conductor constituting a part of the coil and including a second connection portion, the second layer having a through-hole conductor passing through the second layer and connecting the first connection portion and the second connection portion, the second layer overlapping the first layer in a first direction, the first connection portion being larger than the second connection portion when viewed in the first direction, laminating the first layer and the second layer; A method for manufacturing a coil component, wherein in the step of laminating the first layer and the second layer, the relative lamination positions of the first layer and the second layer are determined according to a desired inductance.

2. The method for manufacturing a coil component according to claim 1 , wherein the first coil conductor further includes a third connection portion, and the third connection portion is smaller than the first connection portion when viewed from the first direction.

3. 2. The method for manufacturing a coil component according to claim 1, wherein, when viewed from the first direction, the first coil conductor and the second coil conductor define a rectangular coil, and the first connection portion and the second connection portion are arranged at corners of the rectangle.

4. The method for manufacturing a coil component according to claim 1 , wherein a contact area of ​​the through-hole conductor with the second connection portion is larger than a contact area of ​​the through-hole conductor with the first connection portion when viewed from the first direction.

5. The method for manufacturing a coil component according to claim 1 , wherein at least one of the first connection portion and the second connection portion has a portion protruding from a region where the coil is formed, as viewed from the first direction.

6. The method for manufacturing a coil component according to claim 1 , wherein the coil component includes a plurality of the first coil conductors and a plurality of the second coil conductors.

7. The method for manufacturing a coil component according to claim 1 , wherein the first coil conductor and the second coil conductor have a shape that is rotationally symmetric when viewed from the first direction.

8. 3. The method for manufacturing a coil component according to claim 2, wherein in the process of stacking the first layer and the second layer, the relative stacking positions of the first layer and the second layer are determined with respect to a direction intersecting a direction connecting the first connection portion and the third connection portion when viewed from the first direction.

9. an element body including: a first layer having a first coil conductor that constitutes a part of a coil and that includes a first connection portion provided on a main surface thereof; and a second layer having a second coil conductor that constitutes a part of the coil and that includes a second connection portion provided on a main surface thereof, and having a through-hole conductor that connects the first connection portion and the second connection portion passed through the second layer, the second layer overlapping the first layer in a first direction; A coil component in which the first connection portion is larger than the second connection portion when viewed from the first direction, and the contact area of ​​the through-hole conductor with the second connection portion is larger than the contact area of ​​the through-hole conductor with the first connection portion.

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