Coil component

Abstract

To provide a coil component with reduced inductance.SOLUTION: In a coil component 10, parallel-connected coils 20, 30 are wound in opposite directions when viewed from the stacking direction, such that the magnetic flux generated on the inner diameter of the first coil 20 and the magnetic flux generated on the inner diameter of the second coil 30 cancel each other out. Therefore, the coil component 10 can achieve a lower inductance value than when the parallel-connected coils 20, 30 are wound in the same direction.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] Patent Document 1 below discloses a coil component having two coils provided inside an element body. The two coils are wound in the same direction, and the ends of each coil are connected to a pair of external electrode terminals provided on the surface of the element body so that the two coils are connected in parallel. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 6-112047 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 that can reduce inductance.

[0005] An object of one aspect of the present disclosure is to provide a coil component with reduced inductance. [Means for solving the problem]

[0006] A coil component according to one aspect of the present disclosure has a laminated structure and comprises: an element body having a pair of end faces facing each other in a direction intersecting the stacking direction; a first external electrode and a second external electrode respectively provided on the pair of end faces of the element body; a first coil having a coil axis along the stacking direction of the element body and having a first end electrically connected to the first external electrode and a second end electrically connected to the second external electrode; and a second coil having a coil axis along the stacking direction of the element body and having a first end electrically connected to the first external electrode and a second end electrically connected to the second external electrode and connected in parallel to the first coil; when viewed from the stacking direction, the inner diameter of the first coil and the inner diameter of the second coil at least partially overlap; and the winding direction of the first coil and the second coil are opposite.

[0007] In the above coil component, the first coil and second coil connected in parallel are wound in opposite directions, so that the magnetic flux generated on the inner diameter of the first coil and the magnetic flux generated on the inner diameter of the second coil cancel each other out, thereby reducing inductance compared to when the first coil and the second coil are wound in the same direction. [Effects of the Invention]

[0008] According to various aspects of the present disclosure, a coil component with reduced inductance is provided. [Brief explanation of the drawings]

[0009] [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 configuration of the coil included in the coil component of FIG. [Figure 4] FIG. 4 is a diagram showing the winding directions of (a) the first coil and (b) the second coil. [Figure 5] FIG. 5 is a schematic exploded perspective view showing a coil of a different type. [Figure 6] 6(a) and 6(b) are diagrams each showing one relative positional relationship between the first coil and the second coil. [Figure 7] 7(a) and 7(b) are diagrams showing one possible relative positional relationship between the first coil and the second coil. [Figure 8] 8(a) and 8(b) are diagrams each showing one relative positional relationship between the first coil and the second coil. [Figure 9] FIG. 9 is a graph showing experimental results relating to the Q value of the coil component. [Figure 10] FIG. 10 is a graph showing the experimental results relating to the L value of the coil component. [Figure 11] 11(a) and 11(b) are diagrams showing one possible relative positional relationship between the first coil and the second coil. DETAILED DESCRIPTION OF THE INVENTION

[0010] 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.

[0011] 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, 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.

[0012] Coil component 10 is configured to include an element body 12 and a pair of external terminal electrodes 14A, 14B provided on the surface of element body 12. In this embodiment, coil component 10 has a rectangular parallelepiped outer shape.

[0013] 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).

[0014] Two coils 20, 30, i.e., a first coil 20 and a second coil 30, are provided inside the element body 12. The first coil 20 has a coil axis Z1 parallel to the Z direction, and the second coil 30 has a coil axis Z2 parallel to the Z direction, with the coil axes Z1, Z2 of the two coils 20, 30 being parallel to each other. In this embodiment, the two coils 20, 30 are configured by two layers in which coil conductor patterns 21, 22, 31, and 32 are formed. In this embodiment, the coil conductor patterns 21, 22, 31, and 32 have a substantially uniform line width W.

[0015] In Figure 2, the upper layer is provided with a coil conductor pattern 21 that forms part of the first coil 20 and a coil conductor pattern 31 that forms part of the second coil 30, and the lower layer is provided with a coil conductor pattern 22 that forms part of the first coil 20 and a coil conductor pattern 32 that forms part of the second coil 30.

[0016] The coil conductor pattern 21 has a J-shaped pattern in a plan view. The coil conductor pattern 21 has a lead-out portion 23 that is led out to the end face 12a of the element body 12, and a turn portion 24 that forms approximately one-half turn of the coil 20. The lead-out portion 23 extends along the X direction and is exposed from the end face 12a of the element body 12, with one exposed end forming the first end 20a of the first coil 20. The turn portion 24 extends continuously from the other end of the lead-out portion 23, makes approximately one-half turn around the coil axis Z1, and terminates at the inner end 20b. In this embodiment, the inner end 20b is provided in the form of an electrode pad P1.

[0017] The coil conductor pattern 31 has a J-shaped pattern in a plan view. In this embodiment, the coil conductor pattern 31 has the same shape and dimensions as the coil conductor pattern 21 and is point-symmetric with the coil conductor pattern 21. The coil conductor pattern 31 has a lead-out portion 33 that is led to the end surface 12b of the element body 12 and a turn portion 34 that forms approximately one-half turn of the coil 30. The lead-out portion 33 extends along the X direction and is exposed from the end surface 12b of the element body 12, with one exposed end forming the second end 30a of the second coil 30. The turn portion 34 extends continuously from the other end of the lead-out portion 33, makes approximately one-half turn around the coil axis Z2, and terminates at the inner end 30b. In this embodiment, the inner end 30b is provided in the form of an electrode pad P3.

[0018] The coil conductor pattern 22 has a J-shaped pattern in a plan view. In this embodiment, the coil conductor pattern 22 is plane-symmetric (mirror-image) with respect to the coil conductor pattern 21 with respect to the XZ plane including the coil axis Z1. The coil conductor pattern 22 has a lead-out portion 25 that is led out to the end face 12b of the element body 12 and a turn portion 26 that forms approximately one-half turn of the coil 20. The lead-out portion 25 extends along the X direction and is exposed from the end face 12b of the element body 12, with one exposed end forming the second end 20c of the first coil 20. The turn portion 26 extends continuously from the other end of the lead-out portion 25, makes approximately one-half turn around the coil axis Z1, and terminates at an inner end 20d. In this embodiment, the inner end 20d is provided in the form of an electrode pad P2.

[0019] The coil conductor pattern 32 has a J-shaped pattern in a planar view. In this embodiment, the coil conductor pattern 32 has the same shape and dimensions as the coil conductor pattern 21, is point-symmetric with the coil conductor pattern 21, and is plane-symmetric (mirror image) with respect to the coil conductor pattern 31 with respect to the XZ plane including the coil axis Z2. The coil conductor pattern 32 has a lead-out portion 35 that is led out to the end surface 12a of the element body 12 and a turn portion 36 that forms approximately one-half turn of the coil 30. The lead-out portion 35 extends along the X direction and is exposed from the end surface 12a of the element body 12, with one exposed end forming the first end 30c of the second coil 30. The turn portion 36 extends continuously from the other end of the lead-out portion 35, makes approximately one-half turn around the coil axis Z2, and terminates at an inner end 30d. In this embodiment, the inner end 30d is provided in the form of an electrode pad P4.

[0020] In the first coil 20, the upper coil conductor pattern 21 and the lower coil conductor pattern 22 are connected via a through-hole conductor 28. Specifically, the upper end of the through-hole conductor 28 is connected to the electrode pad P1 of the coil conductor pattern 21, and the lower end is connected to the electrode pad P2 of the coil conductor pattern 22. Similarly, in the second coil 30, the upper coil conductor pattern 31 and the lower coil conductor pattern 32 are connected via a through-hole conductor 38. Specifically, the upper end of the through-hole conductor 38 is connected to the electrode pad P3 of the coil conductor pattern 31, and the lower end is connected to the electrode pad P4 of the coil conductor pattern 32.

[0021] In this embodiment, the coil conductor patterns 21, 22, 31, and 32 of the coils 20 and 30 have the symmetry described above, so that the inner diameter area S1 of the first coil 20 and the inner diameter area S2 of the second coil 30 are substantially the same, as shown in Fig. 4. In this embodiment, when viewed from the stacking direction, the inner diameters of the first coil 20 and the second coil 30 do not overlap so as to completely match, but only partially overlap. Specifically, the first coil 20 and the second coil 30 are shifted in the Y direction by a predetermined shift amount D, based on a configuration in which the inner diameters of the first coil 20 and the second coil 30 overlap so as to completely match. In this embodiment, the shift amount D is designed to be longer than the line width W of the coil conductor patterns 21, 22, 31, and 32 (D>W).

[0022] A pair of external terminal electrodes 14A, 14B are provided on a pair of end faces 12a, 12b, respectively. Each of the external terminal electrodes 14A, 14B may be configured with one or more electrode layers.

[0023] In this embodiment, the external terminal electrode 14A (first external electrode) integrally covers the entire end face 12a, as well as the main surfaces 12c, 12d and side surfaces 12e, 12f in areas adjacent to the end face 12a. As shown in Fig. 3, the first end 20a of the first coil 20 and the first end 30c of the second coil 30 are exposed at the end face 12a of the element body 12, and the external terminal electrode 14A is electrically connected to each of the first end 20a of the first coil 20 and the first end 30c of the second coil 30. Similarly, the external terminal electrode 14B (second external electrode) integrally covers the entire end face 12b, as well as the main surfaces 12c, 12d and side surfaces 12e, 12f in areas adjacent to the end face 12b. As shown in FIG. 3, the second end 20c of the first coil 20 and the second end 30a of the second coil 30 are exposed on the end surface 12b of the element body 12, and the external terminal electrode 14B is electrically connected to each of the second end 20c of the first coil 20 and the second end 30a of the second coil 30.

[0024] The first end 20a of the first coil 20 and the first end 30c of the second coil 30, which are connected to each other by the external terminal electrode 14A, are at the same potential, and the second end 20c of the first coil 20 and the second end 30a of the second coil 30, which are connected to each other by the external terminal electrode 14B, are at the same potential, thereby connecting the first coil 20 and the second coil 30 in parallel.

[0025] Here, the current flowing through the coils 20, 30 when a voltage is applied between the pair of external terminal electrodes 14A, 14B will be described with reference to Fig. 4. Fig. 4 shows the current flowing from the external terminal electrode 14A to the external terminal electrode 14B when an AC voltage is applied between the pair of external terminal electrodes 14A, 14B, as viewed from the Z direction.

[0026] 4(a), in the first coil 20, the current flowing in from the first end 20a connected to the external terminal electrode 14A flows through the upper coil conductor pattern 21, makes a half-circle clockwise, then flows downward from electrode pad P1 to electrode pad P2 via the through-hole conductor 28, then makes a half-circle clockwise around the lower coil conductor pattern 22, and then flows out from the second end 20c connected to the external terminal electrode 14B. As shown in FIG. 4(b), in the second coil 30, the current flowing in from the first end 30c connected to the external terminal electrode 14A flows through the lower coil conductor pattern 32, makes a half-circle counterclockwise, then flows upward from electrode pad P4 to electrode pad P3 via the through-hole conductor 38, then makes a half-circle counterclockwise around the upper coil conductor pattern 31, and then flows out from the second end 30a connected to the external terminal electrode 14B.

[0027] Therefore, when a current flows from the external terminal electrode 14A to the external terminal electrode 14B, the direction of the current circulating through the first coil 20 and the direction of the current circulating through the second coil 30 are opposite when viewed from above in the stacking direction in the parallel-connected coils 20, 30. Conversely, when a current flows from the external terminal electrode 14B to the external terminal electrode 14A, the direction of the current circulating through the first coil 20 and the direction of the current circulating through the second coil 30 are also opposite when viewed from above in the stacking direction in the parallel-connected coils 20, 30.

[0028] In the coil component 10 described above, the parallel-connected coils 20 and 30 are wound in opposite directions when viewed from the stacking direction, so that the magnetic flux generated on the inner diameter of the first coil 20 and the magnetic flux generated on the inner diameter of the second coil 30 cancel each other out. As a result, the coil component 10 can achieve a lower inductance value than when the parallel-connected coils 20 and 30 are wound in the same direction.

[0029] As shown in FIG. 2, the coil component 10 has a two-layer structure including the first coil 20 and the second coil 30. By providing multiple coil conductor patterns on one layer constituting the base body 12, as in the coil component 10, the number of laminations can be reduced, thereby reducing manufacturing steps and costs. Furthermore, by providing multiple coil conductor patterns on one layer, it is possible to suppress stacking misalignment and thus suppress relative positional deviation between the multiple coil conductor patterns. The first coil 20 and the second coil 30 of the coil component 10 may have a four-layer structure as shown in FIG. 5. In the four-layer structure shown in FIG. 5, the above-mentioned coil conductor patterns 21, 22, 31, and 32 are provided on each layer, and are stacked in the order of coil conductor pattern 21, coil conductor pattern 22, coil conductor pattern 31, and coil conductor pattern 32 from top to bottom.

[0030] In the coil component 10, the first coil 20 and the second coil 30 are displaced from each other by a displacement amount D that is longer than the line width W of the coil conductor patterns 21, 22, 31, 32 in the Y direction, and only a part of the inner diameter of the first coil 20 overlaps with the inner diameter of the second coil 30. The displacement amount D in the Y direction between the first coil 20 and the second coil 30 can be appropriately increased or decreased as shown in FIGS. 6 to 8.

[0031] In the form shown in FIG. 6(a), the first coil 20 and the second coil 30 are not displaced in the Y direction (D = 0), that is, the inner diameters of the first coil 20 and the second coil 30 overlap so as to completely coincide. At this time, the area of the region R where the inner diameters of the first coil 20 and the second coil 30 overlap is substantially the same as the inner diameter area S1 of the first coil 20 and the inner diameter area S2 of the second coil 30. In the form shown in FIG. 6(b), the first coil 20 and the second coil 30 are displaced by a displacement amount D that is shorter than the line width W of the coil conductor patterns 21, 22, 31, 32 in the Y direction (D < W), and only a part of the inner diameter of the first coil 20 overlaps with the inner diameter of the second coil 30. At this time, the area of the region R where the inner diameters of the first coil 20 and the second coil 30 overlap is smaller than the inner diameter area S1 of the first coil 20 and the inner diameter area S2 of the second coil 30. Also in the forms shown in FIGS. 6(a) and 6(b), in the region R where the inner diameters of the first coil 20 and the second coil 30 overlap, by canceling the magnetic fluxes with each other, it is possible to reduce the inductance value. The forms of FIGS. 6(a) and 6(b) can be realized by the coils 20 and 30 having a four-layer structure shown in FIG. 5.

[0032] 7(a) and 7(b), the first coil 20 and the second coil 30 are misaligned in the Y direction by a length D greater than the line width W of the coil conductor patterns 21, 22, 31, and 32 (D>W), and the inner diameters of the first coil 20 and the second coil 30 only partially overlap. Compared to the configuration shown in FIG. 7(a), the misalignment D in the Y direction between the first coil 20 and the second coil 30 is greater in the configuration shown in FIG. 7(b). In this case, the area of ​​a region R where the inner diameters of the first coil 20 and the second coil 30 overlap is smaller than the inner diameter area S1 of the first coil 20 and the inner diameter area S2 of the second coil 30. However, the sum of the area of ​​the region R where the inner diameters of the first coil 20 and the second coil 30 overlap and the area of ​​a region r where the inner diameters of the first coil 20 and the second coil 30 do not overlap is larger than the inner diameter area S1 of the first coil 20 and the inner diameter area S2 of the second coil 30. 7(a) and 7(b), the inductance value can also be reduced by canceling out the magnetic fluxes in the region R where the inner diameters of the first coil 20 and the second coil 30 overlap. The configurations of FIGS. 7(a) and 7(b) can be realized in both the two-layer coils 20 and 30 shown in FIG. 2 and the four-layer coils 20 and 30 shown in FIG.

[0033] 8(a) and 8(b), the first coil 20 and the second coil 30 are misaligned in the Y direction by a length D that is greater than the line width W of the coil conductor patterns 21, 22, 31, and 32 (D>W), and the inner diameters of the first coil 20 and the second coil 30 only partially overlap. Compared to the configuration shown in FIG. 7(b), the misalignment D in the Y direction between the first coil 20 and the second coil 30 is greater in the configuration shown in FIG. 8(a), and furthermore, the misalignment D in the Y direction between the first coil 20 and the second coil 30 is greater in the configuration shown in FIG. 8(b). In the configuration shown in FIG. 8(b), the lead portions 23 and 25 of the first coil 20 are aligned along the side surface 12f of the element body 12, and the lead portions 33 and 35 of the second coil 30 are aligned along the side surface 12e of the element body 12. In this case, the area of ​​region R where the inner diameters of the first coil 20 and the second coil 30 overlap is smaller than the inner diameter area S1 of the first coil 20 and the inner diameter area S2 of the second coil 30. However, the sum of the area of ​​region R where the inner diameters of the first coil 20 and the second coil 30 overlap and the area of ​​region r where the inner diameters of the first coil 20 and the second coil 30 do not overlap is larger than the inner diameter area S1 of the first coil 20 and the inner diameter area S2 of the second coil 30. In the configuration shown in FIGS. 8(a) and 8(b), magnetic fluxes cancel each other out in region R where the inner diameters of the first coil 20 and the second coil 30 overlap, thereby reducing the inductance value. The configurations shown in FIGS. 8(a) and 8(b) can be realized in both the two-layer coils 20 and 30 shown in FIG. 2 and the four-layer coils 20 and 30 shown in FIG. 5.

[0034] The inventors performed the following simulation regarding the amount of misalignment D between the first coil 20 and the second coil 30 in the Y direction.

[0035] That is, for each of a plurality of samples 1 to 5 having different displacement amounts D in the Y direction, the Q value, which is a kind of coil characteristic, and the inductance value at 500 MHz were obtained. As shown in FIG. 6(a), sample 1 is in a form where the first coil 20 and the second coil 30 are not displaced at all (D = 0). As shown in FIG. 6(b), sample 2 is in a form where the first coil 20 and the second coil 30 are displaced by a displacement amount D shorter than the line width (W) 35 μm (D < W). Sample 3 shown in FIG. 3, sample 4 shown in FIG. 7(a), and sample 5 shown in FIG. 8(a) are all in a form where the first coil 20 and the second coil 30 are displaced by a displacement amount D longer than the line width W (D > W). Sample 3 is in a form where the displacement amount D is slightly longer than the line width W (D = 40 μm) as shown in FIG. 3, sample 4 is in a form where the displacement amount D is even longer than the line width W (D = 60 μm), and sample 5 is in a form where the displacement amount D is even longer than the line width W (D = 80 μm). The simulation results were as shown in the graphs of FIGS. 9 and 10. The vertical axis of the graph in FIG. 9 shows the Q value (relative value) when the Q value of sample 3 is set to 100%. The vertical axis of the graph in FIG. 10 shows the inductance value (relative value) when the inductance value of sample 1 is set to 100%.

[0036] That is, as shown in the graph of FIG. 9, for the Q value, the minimum was shown in sample 3 and the maximum was shown in sample 5.

[0037] Also, as shown in the graph of FIG. 10, for the inductance value, the minimum was shown in sample 1 and the maximum was shown in sample 5.

[0038] In the coil component 10, the displacement direction between the first coil 20 and the second coil 30 is not limited to the Y direction, and may be other directions. For example, when viewed from the stacking direction, the first coil 20 and the second coil 30 may be displaced in a direction intersecting the Y direction, for example, in the form shown in FIG. 11.

[0039] In the configuration shown in FIG. 11(a), the first coil 20 and the second coil 30 are offset in the X direction perpendicular to the Y direction (i.e., the opposing direction of the end faces 12a and 12b of the element body 12). The first coil 20 and the second coil 30 are offset in the X direction by a length offset D greater than the line width W of the coil conductor patterns 21, 22, 31, and 32 (D>W), and the inner diameters of the first coil 20 and the second coil 30 only partially overlap. The configuration shown in FIG. 11(a) can be realized by the four-layer coils 20 and 30 shown in FIG. 5. In the configuration shown in FIG. 11(b), the first coil 20 and the second coil 30 are offset in a direction (diagonal) intersecting both the X direction and the Y direction, and the inner diameters of the first coil 20 and the second coil 30 only partially overlap. In FIG. 11(b), the first coil 20 and the second coil 30 overlap only at the points where the turn portions 24, 26, 34, and 36 intersect when viewed from the stacking direction, making the first coil 20 and the second coil 30 narrow. Therefore, the stray capacitance generated in the region where the first coil 20 and the second coil 30 face each other in the stacking direction is significantly reduced. The configuration of FIG. 11(b) can be realized with either the two-layer coils 20 and 30 shown in FIG. 2 or the four-layer coils 20 and 30 shown in FIG. 5. In the configurations shown in FIGS. 11(a) and 11(b), the magnetic fluxes cancel each other out in the region R where the inner diameters of the first coil 20 and the second coil 30 overlap, thereby reducing the inductance value.

[0040] As can be understood from the above description, the present specification discloses the following. [Appendix 1] an element body having a laminated structure and a pair of end faces facing each other in a direction intersecting the lamination direction; a first external electrode and a second external electrode provided on a pair of end surfaces of the element body, respectively; a first coil having a coil axis along the stacking direction of the element body, the first end being electrically connected to the first external electrode and a second end being electrically connected to the second external electrode; a second coil having a coil axis along the stacking direction of the element body, a first end electrically connected to the first external electrode and a second end electrically connected to the second external electrode, and connected in parallel to the first coil; Equipped with A coil component in which, when viewed from the stacking direction, the inner diameter of the first coil and the inner diameter of the second coil at least partially overlap, and the winding direction of the first coil and the winding direction of the second coil are opposite. [Appendix 2] 2. The coil component according to claim 1, wherein the inner diameter area of ​​the first coil and the inner diameter area of ​​the second coil are the same when viewed from the stacking direction. [Appendix 3] 3. The coil component according to claim 1, wherein the first coil and the second coil are misaligned when viewed from the stacking direction. [Appendix 4] 4. The coil component according to claim 3, wherein the amount of misalignment between the first coil and the second coil, as viewed from the stacking direction, exceeds the line width of the first coil and the second coil. [Appendix 5] 5. The coil component according to claim 3, wherein the direction of deviation between the first coil and the second coil as viewed from the stacking direction is a direction that intersects with the direction in which the pair of end faces face each other. [Appendix 6] 6. The coil component according to any one of appendixes 1 to 5, wherein the first coil and the second coil have a four-layer structure as a whole. [Appendix 7] 6. The coil component according to any one of appendixes 1 to 5, wherein the first coil and the second coil have a two-layer structure as a whole. [Explanation of symbols]

[0041] 10...coil component, 12...element body, 12a, 12b...end surface, 14A, 14B...external terminal electrode, 20...first coil, 20a...first end, 20c...second end, 30...second coil, 30a...second end, 30c...first end, Z1, Z2...coil axis

Claims

1. an element body having a laminated structure and a pair of end faces facing each other in a direction intersecting the lamination direction; a first external electrode and a second external electrode provided on a pair of end surfaces of the element body, respectively; a first coil having a coil axis along the stacking direction of the element body, the first end being electrically connected to the first external electrode and a second end being electrically connected to the second external electrode; a second coil having a coil axis along the stacking direction of the element body, a first end electrically connected to the first external electrode and a second end electrically connected to the second external electrode, and connected in parallel to the first coil; Equipped with A coil component in which, when viewed from the stacking direction, the inner diameter of the first coil and the inner diameter of the second coil at least partially overlap, and the winding direction of the first coil and the winding direction of the second coil are opposite.

2. The coil component according to claim 1 , wherein an inner diameter area of ​​the first coil and an inner diameter area of ​​the second coil are the same when viewed from the stacking direction.

3. The coil component according to claim 1 , wherein the first coil and the second coil are misaligned when viewed from the stacking direction.

4. The coil component according to claim 3 , wherein an amount of misalignment between the first coil and the second coil when viewed from the stacking direction exceeds a line width of the first coil and the second coil.

5. The coil component according to claim 3 , wherein a direction of deviation between the first coil and the second coil as viewed from the stacking direction intersects with a direction in which the pair of end faces face each other.

6. The coil component according to claim 1 , wherein the first coil and the second coil have a four-layer structure as a whole.

7. The coil component according to claim 1 , wherein the first coil and the second coil have a two-layer structure as a whole.

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