Coil parts

Abstract

To reduce a DC resistance of a coil component.SOLUTION: A conductive layer L1 contained in a coil component 1 includes: a coil pattern 10; and a terminal pattern 11. The terminal pattern 11 contains; a straight liner part 11a where a pattern width in an x direction is nearly constant; and expansion width parts 11b and 11c which are positioned at both end sides in a y direction, and where the pattern width in the x direction is larger than that of the straight liner part 11a. The outermost peripheral turn of the coil pattern 10 contains: intervals S11 to S13 provided along the straight liner part 11a and the expansion width parts 11b and 11c, respectively; and intervals S14 and S15 that are positioned on both sides of the intervals S11 to S13. The pattern width in the intervals S12 and S13 is larger than that in the intervals S11, S14, and S15. Thus, since the pattern width of the coil pattern 10 is locally expanded, deterioration of a DC resistance can be made.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a coil component, and more particularly to a coil component having a structure in which a plurality of interlayer insulating films and a plurality of conductor layers are alternately stacked. [Background technology]

[0002] Patent Document 1 discloses a coil component having a structure in which multiple interlayer insulating films and multiple conductor layers are alternately stacked. In the coil component described in Patent Document 1, two terminal electrodes are arranged in the stacking direction of the multiple conductor layers, one terminal electrode is connected to one end of the coil pattern located on the bottom layer, and the other terminal electrode is connected to one end of the coil pattern located on the top layer. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-088330 Summary of the Invention [Problem to be solved by the invention]

[0004] In the coil component described in Patent Document 1, the pattern width of the coil pattern is almost constant.

[0005] The present invention aims to reduce the DC resistance by locally increasing the pattern width of the coil pattern. [Means for solving the problem]

[0006] A coil component according to the present invention comprises a coil section in which a plurality of interlayer insulating films and a plurality of conductor layers are alternately stacked, first and second terminal electrodes, and a magnetic body in which the coil section and the first and second terminal electrodes are embedded, the plurality of conductor layers including a first conductor layer located at the bottom layer and a second conductor layer located at the top layer, the first conductor layer having a first coil pattern and a first terminal pattern provided independently from the first coil pattern and exposed from a first side surface of the magnetic body, the second conductor layer having a second coil pattern and a second terminal pattern provided independently from the second coil pattern and exposed from a second side surface of the magnetic body opposite to the first side surface, the first terminal electrode being connected to one end of the first coil pattern via the second terminal pattern, and the second terminal electrode being connected to one end of the second coil pattern, the first terminal pattern having a first linearly extending parallel cross section in which the pattern width in a first direction perpendicular to the first side surface of the magnetic body is substantially constant. The first coil pattern includes a line portion, a first widened portion located at one end in the second direction along the first side surface of the magnetic base body and having a pattern width in the first direction larger than that of the first straight portion, and a second widened portion located at the other end in the second direction and having a pattern width in the first direction larger than that of the first straight portion, and the outermost turn of the first coil pattern includes a first section provided along the first straight portion of the first terminal pattern, a second section provided along the first widened portion of the first terminal pattern, a third section provided along the second widened portion of the first terminal pattern, a fourth section provided along the magnetic base body and located on the opposite side of the first section from the second section, and a fifth section provided along the magnetic base body and located on the opposite side of the first section from the third section, and the pattern width in the second and third sections of the first coil pattern is larger than the pattern width in the first, fourth and fifth sections of the first coil pattern.

[0007] According to the present invention, the pattern width of the first coil pattern is locally increased, which makes it possible to reduce the DC resistance.

[0008] In the present invention, the first widened portion of the first terminal pattern may have a shape such that the pattern width in the first direction increases toward one end in the second direction, and the second widened portion of the first terminal pattern may have a shape such that the pattern width in the first direction increases toward the other end in the second direction, thereby making it possible to further increase the pattern width in the third and fourth sections of the first coil pattern.

[0009] In the present invention, the pattern width in the first section of the first coil pattern may increase from the center in the second direction toward the second and third sections, thereby making it possible to further increase the pattern width in the first section of the first coil pattern.

[0010] In the present invention, the second and third sections of the first coil pattern may have outer peripheral edges extending in the first direction, which makes it possible to further increase the pattern width in the second and third sections of the first coil pattern.

[0011] In the present invention, the second terminal pattern includes a non-linear portion whose pattern width in the first direction increases with increasing distance from the center in the second direction, and a second linear portion located at one end in the second direction and having a substantially constant pattern width in the first direction, the outermost turn of the second coil pattern includes a sixth section provided along the non-linear portion of the second terminal pattern, a seventh section provided along the second linear portion of the second terminal pattern, and an eighth section provided along the magnetic body and closer to one end of the second coil pattern than the seventh section, and the pattern width in the seventh section of the second coil pattern may be larger than the pattern widths in the sixth and eighth sections of the second coil pattern. This locally increased pattern width of the second coil pattern makes it possible to further reduce DC resistance.

[0012] In the present invention, the plurality of conductor layers further includes a third conductor layer located between the first conductor layer and the second conductor layer, the third conductor layer having a third coil pattern, a third terminal pattern exposed from a first side surface of the magnetic body, and a fourth terminal pattern exposed from a second side surface of the magnetic body, the first terminal electrode being connected to one end of the first coil pattern via the second and fourth terminal patterns, the third terminal pattern having a third straight portion with a substantially constant pattern width in the first direction, a third widened portion located at one end in the second direction and with a pattern width in the first direction greater than that of the third straight portion, and a fourth widened portion located at the other end in the second direction and with a pattern width in the first direction greater than that of the third straight portion. and a fourth widened portion that is larger than the third coil pattern, and the outermost turn of the third coil pattern includes a ninth section provided along the third straight portion of the third terminal pattern, a tenth section provided along the third widened portion of the third terminal pattern, an eleventh section provided along the fourth widened portion of the third terminal pattern, a twelfth section provided along the magnetic body and located on the opposite side of the ninth section as viewed from the tenth section, and a thirteenth section provided along the magnetic body and located on the opposite side of the ninth section as viewed from the eleventh section, and the pattern width of the tenth and eleventh sections of the third coil pattern may be larger than the pattern width of the ninth, twelfth, and thirteenth sections of the third coil pattern. This locally widened pattern width of the third coil pattern makes it possible to further reduce DC resistance. [Effects of the Invention]

[0013] As described above, according to the present invention, the pattern width of the coil pattern is locally increased, so that the DC resistance can be reduced. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a schematic perspective view showing the appearance of a coil component 1 according to one embodiment of the present invention. [Figure 2] FIG. 2 is a schematic cross-sectional view of the coil device 1. As shown in FIG. [Figure 3]FIG. 3 is a plan view showing the pattern shape of the conductor layer L1. [Figure 4] FIG. 4 is a plan view showing the pattern shape of the conductor layer L2. [Figure 5] FIG. 5 is a plan view showing the pattern shape of the conductor layer L3. [Figure 6] FIG. 6 is a plan view showing the pattern shape of the conductor layer L4. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0016] Fig. 1 is a schematic perspective view showing the appearance of a coil component 1 according to one embodiment of the present invention, and Fig. 2 is a schematic cross-sectional view of the coil component 1.

[0017] As shown in FIGS. 1 and 2 , a coil component 1 according to this embodiment includes a magnetic body 2, a coil portion 3 embedded in the magnetic body 2, and bump-shaped terminal electrodes B1 and B2. The magnetic body 2 is disposed in the inner diameter region and outer diameter region of the coil portion 3, sandwiching the coil portion 3 in the z-direction, which is the axial direction. The magnetic body 2 is a composite magnetic member containing a metal magnetic filler such as iron (Fe) or a Permalloy-based material and a resin binder. It forms a magnetic path for magnetic flux generated when a current flows through the coil portion 3. The magnetic body 2 has a top surface 2a that is perpendicular to the z-direction, which is the coil axis, and forms an x-y plane, and a pair of side surfaces 2b and 2c that are perpendicular to the top surface 2a and form a y-z plane. The side surfaces 2b and 2c are located opposite each other. The surface of the terminal electrode B1 is exposed from the top surface 2a and side surface 2b of the magnetic body 2. The surface of the terminal electrode B2 is exposed from the top surface 2a and side surface 2c of the magnetic body 2. When mounting, the terminal electrodes B1 and B2 are soldered to the circuit board so that the top surface 2a of the magnetic body 2 faces the circuit board.

[0018] The coil section 3 is made up of interlayer insulating films 50 to 54 and conductor layers L1 to L4 that are alternately stacked in the coil axis direction. The conductor layers L1 to L4 have coil patterns 10, 20, 30, and 40, respectively.

[0019] 3 to 6 are plan views showing the pattern shapes of the conductor layers L1 to L4, respectively.

[0020] As shown in FIG. 3, the conductor layer L1 is formed on the surface of the interlayer insulating film 50 and includes a coil pattern 10 and a terminal pattern 11. The outer peripheral edge 12 of the coil pattern 10 has an expanded area and overlaps with the terminal electrode B1 when viewed in the z direction. The terminal pattern 11 is a pattern separated from the coil pattern 10 in-plane and overlaps with the terminal electrode B2 when viewed in the z direction. The terminal pattern 11 includes a linear portion 11a having a substantially constant pattern width in the x direction and widened portions 11b and 11c located at one end and the other end in the y direction, respectively, and having a pattern width in the x direction greater than that of the linear portion 11a. The widened portions 11b and 11c have a shape in which the pattern width in the x direction increases toward the end in the y direction. Therefore, the edges of the widened portions 11b and 11c located opposite the side surface 2c of the magnetic body 2 extend obliquely with respect to the y direction. In contrast, the edge of the linear portion 11a located on the opposite side of the magnetic body 2 from the side surface 2c extends substantially linearly in the y direction.

[0021] Here, the outermost turn of the coil pattern 10 includes a section S11 extending substantially in the y-direction along the straight portion 11a of the terminal pattern 11, a section S12 provided along the widened portion 11b of the terminal pattern 11, a section S13 provided along the widened portion 11c of the terminal pattern 11, a section S14 provided along the magnetic body 2 and located on the opposite side of section S11 from section S12, and a section S15 provided along the magnetic body 2 and located on the opposite side of section S11 from section S13. Section S14 is located closer to the outer circumferential end 12 than section S12 and includes a portion extending in the x-direction. Section S15 is located closer to the inner circumferential end 13 than section S13 and includes a portion extending in the x-direction. The conductor layer L1 having such a configuration is covered with an interlayer insulating film 51.

[0022] 3, the radial pattern width of coil pattern 10 is not constant, and pattern widths W12 and W13 in sections S12 and S13 are larger than pattern widths W11, W14 and W15 in sections S11, S14 and S15. In other words, the outermost turn of coil pattern 10 protrudes radially outward between sections S11 and S14, and protrudes radially outward between sections S11 and S15.

[0023] The outer peripheral edges of sections S11 to S13 of the coil pattern 10 extend along the terminal pattern 11 via the interlayer insulating film 51. Therefore, the outer peripheral edge of section S11 extends approximately linearly in the y direction, and as a result, the pattern width W11 in section S11 increases from the center in the y direction toward sections S12 and S13. Furthermore, the outer peripheral edges of sections S12 and S13 have portions that extend in the x direction. As a result, the increase in pattern width per unit circumferential length from section S14 to section S12 and the increase in pattern width per unit circumferential length from section S15 to section S13 are greater than the increase in pattern width per unit circumferential length from section S11 to sections S12 and S13.

[0024] 4, the conductor layer L2 is formed on the surface of the interlayer insulating film 51 and includes a coil pattern 20 and terminal patterns 21 and 22. The terminal patterns 21 and 22 are patterns separated from the coil pattern 20 in-plane and overlap with the terminal electrodes B2 and B1, respectively, when viewed in the z direction. The terminal pattern 22 is connected to the outer peripheral end 12 of the coil pattern 10 through a via conductor 61 that penetrates the interlayer insulating film 51. The inner peripheral end 23 of the coil pattern 20 is connected to the inner peripheral end 13 of the coil pattern 10 through a via conductor 62 that penetrates the interlayer insulating film 51.

[0025] The terminal pattern 21 has a shape similar to that of the terminal pattern 11 included in the conductor layer L1. That is, the terminal pattern 21 includes a straight portion 21a whose pattern width in the x direction is approximately constant, and widened portions 21b and 21c located at one end and the other end in the y direction, respectively, and whose pattern width in the x direction is larger than that of the straight portion 21a. The widened portions 21b and 21c have a shape in which their pattern width in the x direction increases toward the ends in the y direction. Therefore, the edges of the widened portions 21b and 21c located opposite the side surface 2c of the magnetic body 2 extend in a diagonal direction with respect to the y direction. In contrast, the edge of the straight portion 21a located opposite the side surface 2c of the magnetic body 2 extends approximately linearly in the y direction.

[0026] The terminal pattern 22 includes a non-linear portion 22a whose pattern width in the x direction increases with increasing distance from the center in the y direction, and a linear portion 22b located at one end in the y direction and whose pattern width in the x direction is approximately constant. The edge of the non-linear portion 22a located on the opposite side to the side surface 2b of the magnetic body 2 is arc-shaped. In contrast, the edge of the linear portion 22b located on the opposite side to the side surface 2b of the magnetic body 2 extends approximately linearly in the y direction.

[0027] Here, the outermost turn of the coil pattern 20 includes a section S21 extending substantially in the y-direction along the linear portion 21a of the terminal pattern 21, a section S22 provided along the widened portion 21b of the terminal pattern 21, a section S23 provided along the widened portion 21c of the terminal pattern 21, a section S24 provided along the magnetic body 2 and located on the opposite side of the section S21 from the section S22, a section S25 provided along the magnetic body 2 and located on the opposite side of the section S21 from the section S23, a section S26 provided along the non-linear portion 22a of the terminal pattern 22, and a section S27 provided along the linear portion 22b of the terminal pattern 22. The section S24 is located between the section S22 and the section S27 and includes a portion extending in the x-direction. The section S25 is located closer to the outer circumferential end 24 than the section S23 and includes a portion extending in the x-direction. The conductor layer L2 having such a configuration is covered by an interlayer insulating film 52.

[0028] 4, the radial pattern width of coil pattern 20 is not constant, with pattern widths W22 and W23 in sections S22 and S23 being larger than pattern widths W21, W24 and W25 in sections S21, S24 and S25, and pattern width W27 in section S27 being larger than pattern widths W24 and W26 in sections S24 and S26. In other words, the outermost turn of coil pattern 20 protrudes radially outward between sections S21 and S24, protrudes radially outward between sections S21 and S25, and protrudes radially outward between sections S26 and S24.

[0029] The outer peripheral edges of sections S21 to S23 of the coil pattern 20 extend along the terminal pattern 21 via the interlayer insulating film 52. Therefore, the outer peripheral edge of section S21 extends approximately linearly in the y direction, and as a result, the pattern width W21 in section S21 increases from the center in the y direction toward sections S22 and S23. The outer peripheral edges of sections S22 and S23 also have portions extending in the x direction. As a result, the increase in pattern width per unit circumferential length from section S24 to section S22 and the increase in pattern width per unit circumferential length from section S25 to section S23 are greater than the increase in pattern width per unit circumferential length from section S21 to sections S22 and S23. Similarly, the outer peripheral edge of section S27 has a portion extending in the x direction. As a result, the increase in pattern width per unit circumferential length from section S24 to section S27 is greater than the increase in pattern width per unit circumferential length from section S26 to section S27.

[0030] As shown in FIG. 5, the conductor layer L3 is formed on the surface of the interlayer insulating film 52 and includes a coil pattern 30 and terminal patterns 31 and 32. The terminal patterns 31 and 32 are patterns separated from the coil pattern 30 in-plane and overlap with the terminal electrodes B2 and B1, respectively, when viewed in the z direction. The terminal pattern 32 is connected to the terminal pattern 22 of the conductor layer L2 through a via conductor 63 that penetrates the interlayer insulating film 52. The planar position of the via conductor 63 is different from the planar position of the via conductor 61, which prevents depressions in the conductor layer caused by stacking the via conductors. The outer peripheral end 34 of the coil pattern 30 is connected to the outer peripheral end 24 of the coil pattern 20 through the via conductor 64 that penetrates the interlayer insulating film 52.

[0031] The terminal pattern 31 has a shape similar to that of the terminal patterns 11 and 21 included in the conductor layers L1 and L2. That is, the terminal pattern 31 includes a straight portion 31a whose pattern width in the x direction is approximately constant, and widened portions 31b and 31c located at one end and the other end in the y direction, respectively, whose pattern width in the x direction is larger than that of the straight portion 31a. The widened portions 31b and 31c have a shape in which their pattern width in the x direction increases toward the ends in the y direction. Therefore, the edges of the widened portions 31b and 31c located opposite the side surface 2c of the magnetic body 2 extend in a diagonal direction with respect to the y direction. In contrast, the edge of the straight portion 31a located opposite the side surface 2c of the magnetic body 2 extends approximately linearly in the y direction.

[0032] The terminal pattern 32 has a shape similar to that of the terminal pattern 22 included in the conductor layer L2. That is, the terminal pattern 32 includes a non-linear portion 32a whose pattern width in the x direction increases with increasing distance from the center in the y direction, and a linear portion 32b located on one end side in the y direction and whose pattern width in the x direction is approximately constant. The edge of the non-linear portion 32a located on the opposite side to the side surface 2b of the magnetic body 2 is arc-shaped. In contrast, the edge of the linear portion 32b located on the opposite side to the side surface 2b of the magnetic body 2 extends approximately linearly in the y direction.

[0033] Here, the outermost turn of the coil pattern 30 includes a section S31 extending substantially in the y-direction along the linear portion 31a of the terminal pattern 31, a section S32 provided along the widened portion 31b of the terminal pattern 31, a section S33 provided along the widened portion 31c of the terminal pattern 31, a section S34 provided along the magnetic body 2 and located on the opposite side of the section S31 from the section S32, a section S35 provided along the magnetic body 2 and located on the opposite side of the section S31 from the section S33, a section S36 provided along the non-linear portion 32a of the terminal pattern 32, and a section S37 provided along the linear portion 32b of the terminal pattern 32. The section S34 is located between the section S32 and the section S37 and includes a portion extending in the x-direction. The section S35 is located closer to the inner circumferential end 33 than the section S33 and includes a portion extending in the x-direction. The conductor layer L3 having such a configuration is covered by an interlayer insulating film 53.

[0034] 5, the radial pattern width of coil pattern 30 is not constant, with pattern widths W32 and W33 in sections S32 and S33 being larger than pattern widths W31, W34 and W35 in sections S31, S34 and S35, and pattern width W37 in section S37 being larger than pattern widths W34 and W36 in sections S34 and S36. In other words, the outermost turn of coil pattern 30 protrudes radially outward between sections S31 and S34, protrudes radially outward between sections S31 and S35, and protrudes radially outward between sections S36 and S34.

[0035] The outer peripheral edges of sections S31 to S33 of the coil pattern 30 extend along the terminal pattern 31 via the interlayer insulating film 53. Therefore, the outer peripheral edge of section S31 extends substantially linearly in the y direction, and as a result, the pattern width W31 in section S31 increases from the center in the y direction toward sections S32 and S33. The outer peripheral edges of sections S32 and S33 also have portions extending in the x direction. As a result, the increase in pattern width per unit circumferential length from section S34 to section S32 and from section S35 to section S33 is greater than the increase in pattern width per unit circumferential length from section S31 to sections S32 and S33. Similarly, the outer peripheral edge of section S37 has a portion extending in the x direction. As a result, the increase in pattern width per unit circumferential length from section S34 to section S37 is greater than the increase in pattern width per unit circumferential length from section S36 to section S37.

[0036] As shown in FIG. 6 , the conductor layer L4 is formed on the surface of the interlayer insulating film 53 and includes a coil pattern 40 and a terminal pattern 42. The terminal pattern 42 is a pattern separated from the coil pattern 40 in-plane and overlaps with the terminal electrode B1 when viewed in the z direction. The terminal pattern 42 is connected to the terminal pattern 32 through a via conductor 65 that penetrates the interlayer insulating film 53. The planar position of the via conductor 65 is different from the planar position of the via conductor 63, which prevents depressions in the conductor layer caused by stacking the via conductors. The inner peripheral end 43 of the coil pattern 40 is connected to the inner peripheral end 33 of the coil pattern 30 through a via conductor 66 that penetrates the interlayer insulating film 53.

[0037] The terminal pattern 42 has a shape similar to the terminal patterns 22 and 32 included in the conductor layers L2 and L3. That is, the terminal pattern 42 includes a non-linear portion 42a whose pattern width in the x direction increases with increasing distance from the center in the y direction, and a linear portion 42b located on one end side in the y direction and whose pattern width in the x direction is approximately constant. The edge of the non-linear portion 42a located on the opposite side to the side surface 2b of the magnetic body 2 is arc-shaped. In contrast, the edge of the linear portion 42b located on the opposite side to the side surface 2b of the magnetic body 2 extends approximately linearly in the y direction.

[0038] Here, the outermost turn of the coil pattern 40 includes a section S46 provided along the non-linear portion 42a of the terminal pattern 42, a section S47 provided along the linear portion 42b of the terminal pattern 42, and a section S44 located on the opposite side of section S46 as viewed from section S47. Section S44 is located between section S47 and the outer peripheral edge 41 and includes a portion extending in the x-direction. The conductor layer L4 having this configuration is covered with an interlayer insulating film 54.

[0039] As shown in Figure 6, the radial pattern width of coil pattern 40 is not constant, with pattern width W47 in section S47 being larger than pattern widths W44 and W46 in sections S44 and S46. That is, the outermost turn of coil pattern 40 protrudes radially outward between sections S46 and S44. The outer peripheral edge of section S47 has a portion extending in the x-direction. As a result, the increase in pattern width per unit circumferential length from section S44 to section S47 is larger than the increase in pattern width per unit circumferential length from section S46 to section S47.

[0040] Bump-shaped terminal electrodes B1 and B2 are provided on the interlayer insulating film 54. The terminal electrode B1 is connected to the terminal pattern 42 through a via conductor 67 that penetrates the interlayer insulating film 54. The terminal electrode B2 is connected to the outer peripheral edge 41 of the coil pattern 40 through a via conductor 68 that penetrates the interlayer insulating film 54. The planar position of the via conductor 67 is different from the planar position of the via conductor 65, thereby preventing depressions in the conductor layers that may occur due to the stacking of the via conductors. In addition, the via conductor 68 is provided in a position where it partially overlaps with the section S32 of the coil pattern 30, taking into account a margin when the coil component 1 is divided into individual pieces by dicing.

[0041] With this configuration, terminal electrode B1 is connected to outer peripheral edge 12 of coil pattern 10 via terminal patterns 42, 32, and 22. Outer peripheral edge 12 of coil pattern 10 and terminal patterns 22, 32, and 42 are exposed from side surface 2b of the magnetic body 2. On the other hand, terminal electrode B2 is connected to outer peripheral edge 41 of coil pattern 40. Terminal patterns 11, 21, and 31 and outer peripheral edge 41 of coil pattern 40 are exposed from side surface 2c of the magnetic body 2.

[0042] The pattern widths of the coil patterns 10, 20, 30, and 40 are not constant, but are expanded near the ends of the corresponding terminal patterns in the y direction, thereby reducing DC resistance. Furthermore, the terminal patterns 11, 21, and 31 have straight line portions 11a, 21a, and 31a, and the outer edges of the coil patterns 10, 20, and 30 adjacent to the straight line portions 11a, 21a, and 31a are also substantially straight. This allows the coil patterns 10, 20, and 30 to have a sufficient pattern width compared to when the inner edges of the terminal patterns 11, 21, and 31 are arc-shaped. The reason for making the inner edges of the straight line portions 11a, 21a, and 31a straight is to minimize the area of ​​the terminal patterns 11, 21, and 31 while ensuring a minimum margin in the x direction to account for misalignment when dicing the coil component 1. This makes it possible to increase the pattern width of the coil patterns 10, 20, and 30 by the amount corresponding to the reduction in the area of ​​the terminal patterns 11, 21, and 31. This is possible because the terminal patterns 11, 21, and 31 are insulated from each other and are not connected to each other, and there is no need to provide via conductors, making it easy to reduce the width in the x direction.

[0043] Furthermore, the widened portions 11b and 11c provided at both ends of the straight portion 11a in the y direction, the widened portions 21b and 21c provided at both ends of the straight portion 21a in the y direction, and the widened portions 31b and 31c provided at both ends of the straight portion 31a in the y direction serve to increase the manufacturing yield of the coil component 1 according to this embodiment. This is because, by providing such widened portions, when the conductor layers L1, L2, and L3 are formed by electrolytic plating, the resist pattern located between the coil patterns 10, 20, and 30 and the terminal patterns 11, 21, and 31 includes non-linear portions corresponding to the widened portions, and therefore the flow of the plating solution used in electrolytic plating is suppressed by the non-linear portions of the resist pattern, making it less likely that the resist pattern will collapse.

[0044] On the other hand, because the via conductors 61, 63, 65, and 67 are connected to the terminal patterns 22, 32, and 42, taking into consideration the formation margins of the via conductors 61, 63, 65, and 67, it is necessary to ensure a sufficient width in the x direction compared to the terminal patterns 11, 21, and 31. For this reason, the inner peripheral edges of the terminal patterns 22, 32, and 42 are arc-shaped, rather than providing the straight line portions 11a, 21a, and 31a as in the terminal patterns 11, 21, and 31. Even in this case, the width in the x direction is reduced by providing straight line portions 22b, 32b, and 42b at the ends in the y direction of the terminal patterns 22, 32, and 42 where the via conductors 61, 63, 65, and 67 are not formed, and the pattern width of the coil patterns 20, 30, and 40 is increased accordingly, thereby reducing the DC resistance.

[0045] Here, when the above-mentioned pattern widths W11 to W15, W21 to W27, W31 to W37, W44, W46, and W47 vary depending on the circumferential position, the pattern width may be defined as the average width.

[0046] The above describes a preferred embodiment of the present invention, but the present invention is not limited to the above embodiment, and various modifications are possible within the scope of the present invention, and it goes without saying that these modifications are also included within the scope of the present invention.

[0047] For example, in the above embodiment, four conductor layers L1 to L4 are stacked with an interlayer insulating film interposed therebetween, but the number of stacked conductor layers is not limited to this, and it may be a three-layer structure or a structure with five or more layers stacked. [Explanation of symbols]

[0048] 1 Coil parts 2 Magnetic element 2a Top surface of magnetic element 2b, 2c Side of magnetic element 3 Coil section 10, 20, 30, 40 coil patterns 11,21,22,31,32,42 terminal pattern 11a,21a,22b,31a,32b,42b Straight section 11b, 11c, 21b, 21c, 31b, 31c Widened section 12,24,34,41 Outer edge 13, 23, 33, 43 Inner end 22a,32a,42a Non-linear part 50~54 Interlayer insulating film 61~68 Via conductors B1,B2 terminal electrode L1~L4 conductor layers S11~S15, S21~S27, S31~S37, S44, S46, S47 sections

Claims

1. a coil portion in which a plurality of interlayer insulating films and a plurality of conductor layers are alternately stacked; first and second terminal electrodes; a magnetic element in which the coil portion and the first and second terminal electrodes are embedded, the plurality of conductor layers include a first conductor layer located at the bottom layer and a second conductor layer located at the top layer, the first conductor layer has a first coil pattern and a first terminal pattern provided independently of the first coil pattern and exposed from a first side surface of the magnetic body; the second conductor layer has a second coil pattern and a second terminal pattern that is provided independently of the second coil pattern and is exposed from a second side surface of the magnetic body that is located opposite the first side surface, the first terminal electrode is connected to one end of the first coil pattern via the second terminal pattern; the second terminal electrode is connected to one end of the second coil pattern, the first terminal pattern includes a first linear portion having a substantially constant pattern width in a first direction perpendicular to the first side surface of the magnetic body, a first widened portion located at one end in a second direction along the first side surface of the magnetic body and having a pattern width in the first direction larger than that of the first linear portion, and a second widened portion located at the other end in the second direction and having a pattern width in the first direction larger than that of the first linear portion, the outermost turn of the first coil pattern includes a first section provided along the first linear portion of the first terminal pattern, a second section provided along the first widened portion of the first terminal pattern, a third section provided along the second widened portion of the first terminal pattern, a fourth section provided along the magnetic body and located on the opposite side of the first section from the second section, and a fifth section provided along the magnetic body and located on the opposite side of the first section from the third section, A coil component, characterized in that the pattern width of the first coil pattern in the second and third sections is larger than the pattern width of the first coil pattern in the first, fourth and fifth sections.

2. the first widened portion of the first terminal pattern has a shape in which a pattern width in the first direction increases toward the one end in the second direction, 2. The coil component according to claim 1, wherein the second widened portion of the first terminal pattern has a shape in which the pattern width in the first direction increases as the second widened portion approaches the other end in the second direction.

3. 3. The coil component according to claim 1, wherein a pattern width of the first coil pattern in the first section increases from the center in the second direction toward the second and third sections.

4. 4. The coil component according to claim 1, wherein the second and third sections of the first coil pattern have outer peripheral edges extending in the first direction.

5. the second terminal pattern includes a non-linear portion in which the pattern width in the first direction increases with increasing distance from a central portion in the second direction, and a second linear portion located on one end side in the second direction and having a substantially constant pattern width in the first direction; the outermost turn of the second coil pattern includes a sixth section provided along the non-linear portion of the second terminal pattern, a seventh section provided along the second linear portion of the second terminal pattern, and an eighth section provided along the magnetic body and closer to the one end of the second coil pattern than the seventh section, 5. The coil component according to claim 1, wherein a pattern width in the seventh section of the second coil pattern is larger than pattern widths in the sixth and eighth sections of the second coil pattern.

6. the plurality of conductor layers further includes a third conductor layer located between the first conductor layer and the second conductor layer; the third conductor layer has a third coil pattern, a third terminal pattern exposed from the first side surface of the magnetic body, and a fourth terminal pattern exposed from the second side surface of the magnetic body, the first terminal electrode is connected to the one end of the first coil pattern via the second and fourth terminal patterns; the third terminal pattern includes a third linear portion having a substantially constant pattern width in the first direction, a third widened portion located at one end in the second direction and having a pattern width in the first direction larger than that of the third linear portion, and a fourth widened portion located at the other end in the second direction and having a pattern width in the first direction larger than that of the third linear portion, the outermost turn of the third coil pattern includes a ninth section provided along the third linear portion of the third terminal pattern, a tenth section provided along the third widened portion of the third terminal pattern, an eleventh section provided along the fourth widened portion of the third terminal pattern, a twelfth section provided along the magnetic body and located on the opposite side of the ninth section from the tenth section, and a thirteenth section provided along the magnetic body and located on the opposite side of the ninth section from the eleventh section, 6. The coil component according to claim 5, wherein the pattern width of the third coil pattern in the tenth and eleventh sections is larger than the pattern width of the third coil pattern in the ninth, twelfth, and thirteenth sections.

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