Coil component and wireless energy transmission device comprising this component

Abstract

A coil component (1) comprising: a first coil; a second coil arranged to surround the first coil, and a substrate (10) on which the first and second coils are formed, wherein the first coil includes a first portion (S1) extending in a first direction, a second portion (S2) extending in a second direction orthogonal to the first direction, and a third portion (S3) disposed between the first and second portions (S1, S2), wherein gaps between the first, second and third sections (S1, S2, S3) of the first coil and the second coil, viewed in the direction of the coil axis, have a first width (W1), a second width (W2) and a third width (W3), respectively, wherein the second width (W2) is greater than the first width (W1) and smaller than the third width (W3), wherein the second coil includes a first coil pattern (CP1) arranged on one surface of the substrate (10) and a second coil pattern (CP2) arranged on another surface of the substrate (10), wherein the first and second coil patterns (CP1, CP2) have a portion overlapping in the direction of the coil axis and another portion not overlapping in the direction of the coil axis, wherein each of the first and second coil patterns (CP1, CP2) includes a fourth section (S4) extending in the first direction, a fifth section (S5) extending in the second direction, and a sixth section (S6) disposed between the fourth and fifth sections (S4, S5), wherein the fourth section (S4) of the first coil pattern (CP1) overlaps the fourth section (S4) of the second coil pattern (CP2), wherein the fifth section (S5) of the first coil pattern (CP1) overlaps the fifth section (S5) of the second coil pattern (CP2), and wherein the sixth section (S6) of the first coil pattern (CP1) does not overlap the sixth section (S6) of the second coil pattern (CP2).

Description

BACKGROUND OF THE INVENTION--Field of the Invention

[0001] The present disclosure relates to a coil component and a wireless power transmission device including the coil component. --Description of related technology

[0002] The coil component described in JP 2015-092569A has a structure in which a coil pattern for near-field communication (NFC) is arranged to surround a coil pattern for wireless power transmission. US 2015 / 0145635 A1, US 2018 / 0205268A1, and US 2021 / 0110962 A1 each describe a coil component with two coils or coil patterns.

[0003] However, in the coil component described in JP 2015-92569A, the coil pattern for wireless power transmission has an elliptical shape and the coil pattern for NFC has a substantially rectangular shape, which makes it difficult to satisfy both the power transmission characteristics and the communication characteristics. SUMMARY

[0004] It is therefore an object of the present disclosure to provide a coil component capable of meeting the different characteristics required for two coils with different functions. This object is achieved by the subject matter of independent claim 1.

[0005] A coil component according to the present disclosure includes a first coil and a second coil arranged to surround the first coil. The first coil includes a first portion extending in a first direction, a second portion extending in a second direction orthogonal to the first direction, and a third portion disposed between the first and second portions. Gaps between the first, second, and third portions of the first coil and the second coil have, as viewed in the coil axis direction, a first width, a second width, and a third width, respectively, wherein the second width is greater than the first width and less than the third width.

[0006] With this configuration it is possible to satisfy both characteristics desired by two coils with different functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The above features and advantages of the present disclosure will become more apparent from the following description of certain preferred embodiments taken in conjunction with the accompanying drawings in which: Fig. 1 is a schematic cross-sectional view for explaining the structure of a coil component 1 according to an embodiment of the present disclosure; Fig. 2 is a schematic plan view illustrating the shape of a conductor pattern formed on the surface 11 of the substrate 10; Fig. 3 is a schematic transparent plan view illustrating the shape of a conductor pattern formed on the surface 12 of the substrate 10 as viewed from the side of the surface 11 of the substrate 10; Fig. 4 is a schematic plan view illustrating a state in which the first and third coil patterns CP1 and CP3 and the second and fourth coil patterns CP2 and CP4 overlap as viewed from the surface 11 of the substrate 10; Fig. 5 is a schematic diagram for explaining the function of the coil component 1; and Fig. 6 is a block diagram of a wireless power transmission device 90 using the coil component 1. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0008] Preferred embodiments of the present disclosure will be explained in detail below with reference to the accompanying drawings.

[0009] Fig. 1 is a schematic cross-sectional view for explaining the structure of a coil component 1 according to an embodiment of the present disclosure.

[0010] As in Fig. As shown in FIG. 1, the coil component 1 according to the embodiment includes a substrate 10 made of, for example, a PET film, a first coil pattern CP1 and a third coil pattern CP3 provided on one surface 11 of the substrate 10, a second coil pattern CP2 and a fourth coil pattern CP4 provided on the other surface 12 of the substrate 10, and a magnetic sheet 30. The third and fourth coil patterns CP3 and CP4 form a power transmission coil C1 for wireless power transmission, which is an example of a first coil. The first and second coil patterns CP1 and CP2 form an antenna coil C2 for NFC, which is an example of a second coil. The direction of the coil axis of the power transmission coil C1 and the antenna coil C2 is the z-direction, and the substrate 10 and the magnetic sheet 30 are arranged to overlap in the z-direction. Although the surface 11 of the substrate 10 in the Fig. 1, the substrate 10 may be set such that the surface 12 of the substrate 10 faces the magnetic film 30.

[0011] Fig. 2 is a schematic plan view illustrating the shape of a conductor pattern formed on the surface 11 of the substrate 10.

[0012] As in Fig. As illustrated in Fig. 2, the first coil pattern CP1, the third coil pattern CP3, and the first to fourth terminal electrodes E1 to E4 are formed on the surface 11 of the substrate 10. The first and second terminal electrodes E1 and E2 are arranged to be sandwiched between the third and fourth terminal electrodes E3 and E4, so that the current flowing in the current transmission coil C1 has substantially the same influence on the third and fourth terminal electrodes E3 and E4, which reduces the influence of noise of the current transmission coil C1 compared to when the first to fourth terminal electrodes E1 to E4 are arranged in this order. This also facilitates connection to a device in which the coil component 1 is to be incorporated.

[0013] The third coil pattern CP3 has a six-turn configuration formed by turns 110, 120, 130, 140, 150, and 160, with turns 110 and 160 located on the outer and inner circumferences, respectively. Turns 110, 120, 130, 140, and 150 are each radially divided into four by three spiral slots. Turn 160 is radially divided into two by a single spiral slot. Thus, the winding 110 is divided into four lines 111 to 114, the winding 120 into four lines 121 to 124, the winding 130 into four lines 131 to 134, the winding 140 into four lines 141 to 144, the winding 150 into four lines 151 to 154 and the winding 160 into two lines 161 and 162.

[0014] Lines 111, 121, 131, 141, 151, and 161 are continuous lines spirally wound in six turns, each located at the outermost periphery in the corresponding turn. Lines 112, 122, 132, 142, 152, and 162 are continuous lines spirally wound in six turns, each located second from the outermost periphery in the corresponding turn. Lines 113, 123, 133, 143, and 153 are continuous lines spirally wound in five turns, each located second from the innermost periphery in their corresponding turn. Lines 114, 124, 134, 144 and 154 are continuous lines spirally wound in five turns and are each located at the innermost circumference in the corresponding turn.

[0015] The outer peripheral ends of the lines 111 to 114 are commonly connected to the first terminal electrode E1. The inner peripheral ends of the lines 161, 162, 153, and 154 are respectively connected to via conductors 301 to 304 penetrating the substrate 10.

[0016] The third coil pattern CP3 includes a first section S1 extending in the y-direction (first direction), a second section S2 extending in the x-direction (second direction), and a third section S3 located between the first and second sections S1 and S2. When the position where the terminal electrodes E1 to E4 are arranged is assumed to be the 6 o'clock position, the first section S1 is positioned at the 3 o'clock and 9 o'clock positions, and the second section S2 is positioned at the 12 o'clock position.

[0017] The first coil pattern CP1 includes a conductor pattern 41 arranged outside the third coil pattern CP3 so as to surround the third coil pattern CP3, and a conductor pattern 42 arranged outside the third coil pattern CP3, separated from the conductor pattern 41. The conductor pattern 41 is a continuous line wound in approximately one turn, and the third coil pattern CP3 is arranged in the opening region (inner diameter region) of the conductor pattern 41. One end of the conductor pattern 41 is connected to the third terminal electrode E3, and the other end is connected to a via conductor 43 penetrating the substrate 10. One end of the conductor pattern 42 is connected to the fourth terminal electrode E4, and the other end is connected to a via conductor 44 penetrating the substrate 10.

[0018] The first coil pattern CP1 includes a fourth section S4 extending in the y-direction, a fifth section S5 extending in the x-direction, and a sixth section S6 located between the fourth and fifth sections S4 and S5. If the position where the terminal electrodes E1 to E4 are arranged is assumed to be the 6 o'clock position, the fourth section S4 is positioned at the 3 o'clock and 9 o'clock positions, and the fifth section S5 is positioned at the 12 o'clock position.

[0019] Fig. 3 is a schematic transparent plan view illustrating the shape of a conductor pattern formed on the surface 12 of the substrate 10 as viewed from the side of the surface 11 of the substrate 10.

[0020] As in Fig. 3, the second coil pattern CP2 and the fourth coil pattern CP4 are formed on the surface 12 of the substrate 10.

[0021] The fourth coil pattern CP4 has the same pattern shape as the third coil pattern CP3. The fourth coil pattern CP4 has a six-turn configuration formed by turns 210, 220, 230, 240, 250, and 260, with turns 210 and 260 located on the outer and inner circumferences, respectively. Turns 210, 220, 230, 240, and 250 are each radially divided into four by three spiral slots. Turn 260 is radially divided into two by a single spiral slot. Thus, the winding 210 is divided into four lines 211 to 214, the winding 220 into four lines 221 to 224, the winding 230 into four lines 231 to 234, the winding 240 into four lines 241 to 244, the winding 250 into four lines 251 to 254 and the winding 260 into two lines 261 and 262.

[0022] Lines 211, 221, 231, 241, 251, and 261 are continuous lines spirally wound in six turns, each located at the outermost periphery in the corresponding turn. Lines 212, 222, 232, 242, 252, and 262 are continuous lines spirally wound in six turns, each located second from the outermost periphery in the corresponding turn. Lines 213, 223, 233, 243, and 253 are continuous lines spirally wound in five turns, each located second from the innermost periphery in their corresponding turn. Lines 214, 224, 234, 244 and 254 are continuous lines spirally wound in five turns, each located on the innermost peripheral line in its corresponding turn.

[0023] The outer peripheral ends of the leads 211 to 214 are commonly connected to the second terminal electrode E2 via through conductors. The inner peripheral ends of the leads 261, 262, 253, and 254 are connected to the through conductors 304, 303, 302, and 301, respectively. Consequently, the power transmission coil C1, having a configuration in which four leads of 11 turns each are connected in parallel, is connected between the first and second terminal electrodes E1 and E2.

[0024] Like the third coil pattern CP3, the fourth coil pattern CP4 also comprises a first section S1 extending in the y-direction, a second section S2 extending in the x-direction, and a third section S3 located between the first and second sections S1 and S2.

[0025] The conductor pattern 45 constituting the second coil pattern CP2 is a continuous line wound approximately one turn and arranged outside the fourth coil pattern CP4 so as to surround the fourth coil pattern CP4. That is, the fourth coil pattern CP4 is arranged in the opening area (inner diameter area) of the conductor pattern 45 constituting the second coil pattern CP2. One end and the other end of the conductor pattern 45 are connected to the through conductors 43 and 44, respectively. Consequently, the antenna coil C2 formed from the first and second coil patterns CP1 and CP2 has approximately two turns in total.

[0026] Like the first coil pattern CP1, the second coil pattern CP2 includes a fourth section S4 extending in the y-direction, a fifth section S5 extending in the x-direction, and a sixth section S6 located between the fourth and fifth sections S4 and S5.

[0027] Fig. 4 is a schematic plan view illustrating a state in which the first and third coil patterns CP1 and CP3 and the second and fourth coil patterns CP2 and CP4 overlap as viewed from the surface 11 of the substrate 10.

[0028] As in Fig. As illustrated in Figure 4, in the first and second coil patterns CP1 and CP2 constituting the antenna coil C2, the fourth portions S4 overlap in the z-direction and the fifth portions S5 overlap in the z-direction, while the sixth portions S6 do not overlap in the z-direction. Although not particularly limited, in each of the sixth portions S6, the conductor pattern 45 constituting the second coil pattern CP2 is arranged on the outer peripheral side of the conductor pattern 41 constituting the first coil pattern CP1. By employing the configuration in which the first and second coil patterns CP1 and CP2 partially overlap each other, it is possible to reduce the size of the antenna coil C2 and simultaneously reduce stray capacitance generated between the first and second coil patterns CP1 and CP2. In particular, the linearly extending portions S4 and S5 overlap those of the counter coil pattern, thereby facilitating pattern design.

[0029] The sixth sections S6 each have a curved part S6a and a transition part S6b. The curved part S6a is located near the fourth section S4, and its extension direction gradually changes from the y-direction to the x-direction as it extends from the fourth section S4 to the fifth section S5. The transition part Sb6 is located near the fifth section S5 and shifts the position of the fifth section S5 outward in the y-direction toward the plane of the substrate 10. As a result, the opening area of ​​the antenna coil C2 in the y-direction is enlarged in width at its central part in the x-direction, so that even if the position of the antenna coil C2 and the position of an antenna coil as a communication target are shifted relative to each other in the y-direction, communication can be performed properly.

[0030] Assuming that a first width of a gap between the first portion S1 of the power transmission coil C1 and the fourth portion S4 of the antenna coil C2 is W1, a second width of a gap between the second portion S2 of the power transmission coil C1 and the fifth portion S5 of the antenna coil C2 is W2, and a third width of a gap between the third portion S3 of the power transmission coil C1 and the sixth portion S6 of the antenna coil C2 is W3, W1 < W2 < W3 is satisfied. That is, the second width W2 is larger than the width W1 and smaller than the third width W3. This ensures a sufficient width in the x-direction of the power transmission coil C1, so that even if the position of the power transmission coil C1 and the position of a power reception coil are shifted relative to each other in the x-direction, power injection can be performed properly.Furthermore, since the second and third widths W2 and W3 are larger than the first width W1, the coupling between the power transmission coil C1 and the antenna coil C2 at the gaps with the second and third widths W2 and W3 is reduced, so that satisfactory communication characteristics can be obtained. In particular, the third width W3 is larger than the second width W2, which makes it easier for the magnetic flux generated by the antenna coil C2 to pass through the gap with the third width W3, which further improves the communication characteristics. The gap between the power transmission coil C1 and the antenna coil C2 has the third width W3 not only in the 1 o'clock direction, 2 o'clock direction, 10 o'clock direction, and 11 o'clock direction, but also in the 4 o'clock direction, 5 o'clock direction, 7 o'clock direction, and 8 o'clock direction.That is, a portion of the antenna coil C2 positioned at the 4 o'clock direction, the 5 o'clock direction, the 7 o'clock direction, and the 8 o'clock direction has the same pattern shape as the sixth portion positioned at the 1 o'clock direction, the 2 o'clock direction, the 10 o'clock direction, and the 11 o'clock direction, and includes the aforementioned curved portion S6a and the transition portion S6b. In the present embodiment, the power transmission coil C1 and the antenna coil C2 each have a width that is larger in the x-direction than in the y-direction.

[0031] Assuming that the distance between the sixth portion S6 of the antenna coil C2 and a corner portion of the magnetic sheet 30, viewed in the z direction, is W4, W3 < W4 is satisfied. That is, the distance between the sixth portion S6 of the antenna coil C2 and the corner portion of the magnetic sheet 30, viewed in the z direction, is greater than the distance between the third portion S3 of the power transmission coil C1 and the sixth portion S6 of the antenna coil C2, viewed in the z direction. Thus, the area of ​​the magnetic sheet 30 located outside the antenna coil C2, viewed in the z direction, is sufficiently secured, so that even if a metal element is present on the back of the magnetic sheet 30, the influence of a demagnetizing field generated by the metal element is reduced.

[0032] Furthermore, as in Fig. As illustrated in Figure 1, assuming that the distance between the antenna coil C2 and the magnetic sheet 30 in the z-direction is W0, W0 < W4 is satisfied. That is, the distance between the antenna coil C2 and the end edge of the magnetic sheet 30 in the in-plane direction of the substrate 10 is greater than the distance between the antenna coil C2 and the magnetic sheet 30 in the z-direction. Thus, the distance between the antenna coil C2 and the magnetic sheet 30 in the z-direction is small, so that even if a metal element is present on the back of the magnetic sheet 30, the influence of a demagnetizing field generated by the metal element is reduced.

[0033] Furthermore, a part of the conductor pattern 41 constituting the first coil pattern CP1 and positioned near the through conductor 43 overlaps the fourth coil pattern CP4 in the z-direction to cross the vicinity of the outer peripheral end of the fourth coil pattern CP4, that is, to cross between the outer peripheral end of the fourth coil pattern CP4 and the outermost turn thereof. Similarly, a part of the conductor pattern 45 constituting the second coil pattern CP2 and positioned near the through conductor 43 overlaps the third coil pattern CP3 in the z-direction to cross the vicinity of the outer peripheral end of the third coil pattern CP3, that is, between the outer peripheral end of the third coil pattern CP3 and the outermost turn thereof.This minimizes overlap between the power transmission coil C1 and the antenna coil C2, thereby preventing deterioration of communication characteristics due to stray capacitance therebetween.

[0034] Fig. Figure 5 is a schematic diagram to explain the function of the coil component 1.

[0035] As in Fig. As illustrated in Figure 5, when the coil component 1 according to the present embodiment and a counterpart device 2 as a communication target are opposed to each other across a space 3, magnetic flux φ1 generated by the power transmission coil C1 is linked to a power reception coil C3 included in the counterpart device 2, thereby achieving wireless power transmission. Furthermore, magnetic flux φ2 generated by the antenna coil C2 links an antenna coil C4 included in the counterpart device 2, thereby achieving NFC-based wireless communication.

[0036] As described above, in the coil component 1 of the present embodiment, the conductor patterns formed on the surfaces of the substrate 10 constitute both the power transmission coil C1 for wireless power transmission and the antenna coil C2 for NFC, which enables a reduction in the number of components.

[0037] Fig. 6 is a block diagram of a wireless power transmission device 90 using the coil component 1 according to the present embodiment.

[0038] The Fig. The wireless power transmission device 90 illustrated in Figure 6 includes the coil component 1 including the power transmission coil C1 and the antenna coil C2, a power transmission circuit 91 connected to the power transmission coil C1, and a communication circuit 92 connected to the antenna coil C2. The power transmission circuit 91 and the communication circuit 92 are connected to a control circuit 93. Thus, data to be transmitted / received via a communication line 94 can be communicated via the antenna coil C2 for NFC, and power supplied from a power supply 95 can be wirelessly transmitted via the power transmission coil C1 for wireless power transmission.

[0039] The technology according to the present disclosure includes, but is not limited to, the following configuration examples.

[0040] A coil component according to the present disclosure includes a first coil and a second coil arranged to surround the first coil. The first coil includes a first portion extending in a first direction, a second portion extending in a second direction orthogonal to the first direction, and a third portion disposed between the first and second portions. Gaps between the first, second, and third portions of the first coil and the second coil have, as viewed in the coil axis direction, a first width, a second width, and a third width, respectively, where the second width is greater than the first width and less than the third width. With this configuration, it is possible to satisfy both power transmission characteristics and communication characteristics by using the first and second coils as a power transmission coil and an antenna coil, respectively.

[0041] The coil component according to the present disclosure may further include a substrate on which the first and second coils are formed, wherein the second coil may include a first coil pattern provided on one surface of the substrate and a second coil pattern provided on the other surface of the substrate, and the first and second coil patterns have a portion that overlaps in the coil axis direction and another portion that does not overlap in the coil axis direction. This reduces the size of the second coil while reducing stray capacitance generated between the first and second coil patterns.

[0042] Each of the first and second coil patterns may include a fourth portion extending in the first direction, a fifth portion extending in the second direction, and a sixth portion disposed between the fourth and fifth portions. The fourth portion of the first coil pattern may overlap the fourth portion of the second coil pattern, the fifth portion of the first coil pattern may overlap the fifth portion of the second coil pattern, and the sixth portion of the first coil pattern may not overlap the sixth portion of the second coil pattern. This may further reduce the size of the second coil.

[0043] The sixth portion of each of the first and second coil patterns may include: a curved portion positioned near the fourth portion, the extension direction of which gradually changes from the first direction to the second direction as it extends from the fourth portion to the fifth portion; and a transition portion positioned near the fifth portion, which shifts the position of the fifth portion outward in the first direction in the plane of the substrate. Thus, using the second coil as an antenna coil enables proper communication even when the position of the second coil and the position of an antenna coil as a communication target are shifted relative to each other in the first direction.

[0044] The coil component according to the present disclosure may include a magnetic sheet that overlaps the first and second coils in the coil axis direction, wherein the distance between the sixth portion of the second coil and a corner portion of the magnetic sheet, viewed in the coil axis direction, may be greater than the distance between the third portion of the first coil and the sixth portion of the second coil, viewed in the coil axis direction. Thus, the influence of a demagnetizing field generated by the metal element is reduced, even if a metal element is located on the back side of the magnetic sheet.

[0045] Furthermore, the distance between the second coil and the end edge of the magnetic foil in the direction of the substrate plane can be greater than the distance between the second coil and the magnetic foil in the direction of the coil axis. This reduces the influence of a demagnetizing field generated by the metal element, even if a metal element is located on the back of the magnetic foil.

[0046] Furthermore, the first coil may include a third coil pattern provided on one surface of the substrate and a fourth coil pattern provided on the other surface of the substrate, wherein the inner circumferential end of the third coil pattern may be connected to the inner circumferential end of the fourth coil pattern by a through conductor penetrating the substrate, the outer circumferential end of the third coil pattern may be connected to a first terminal electrode, the outer circumferential end of the fourth coil pattern may be connected to a second terminal electrode, a part of the first coil pattern may overlap the fourth coil pattern in the direction of the coil axis so as to cross between the outer circumferential end of the fourth coil pattern and the outermost turn of the fourth coil pattern, and a part of the second coil pattern may overlap the third coil pattern in the direction of the coil axis.so that it crosses between the outer peripheral end of the third coil pattern and the outermost turn of the third coil pattern. Thus, using the second coil as an antenna coil can prevent deterioration of the communication characteristics due to stray capacitance between the first and second coils.

[0047] Furthermore, one end of the second coil is connected to a third terminal electrode, the other end of the second coil is connected to a fourth terminal electrode, and the first and second terminal electrodes can be arranged between the third and fourth terminal electrodes. This reduces the influence of noise from the first coil and facilitates connection to a device in which the coil component is to be incorporated.

[0048] Furthermore, a wireless power transmission device according to the present disclosure includes: the coil component described above; a power transmission circuit connected to the first coil; and a communication circuit connected to the second coil. With this configuration, wireless power transmission and NFC-based communication can be achieved.

Claims

[1] A coil component (1) comprising: a first coil; a second coil arranged to surround the first coil, and a substrate (10) on which the first and second coils are formed, wherein the first coil includes a first portion (S1) extending in a first direction, a second portion (S2) extending in a second direction orthogonal to the first direction, and a third portion (S3) disposed between the first and second portions (S1, S2), wherein gaps between the first, second and third sections (S1, S2, S3) of the first coil and the second coil, viewed in the direction of the coil axis, have a first width (W1), a second width (W2) and a third width (W3), respectively, wherein the second width (W2) is greater than the first width (W1) and smaller than the third width (W3), wherein the second coil includes a first coil pattern (CP1) arranged on one surface of the substrate (10) and a second coil pattern (CP2) arranged on another surface of the substrate (10), wherein the first and second coil patterns (CP1, CP2) have a portion overlapping in the direction of the coil axis and another portion not overlapping in the direction of the coil axis, wherein each of the first and second coil patterns (CP1, CP2) includes a fourth section (S4) extending in the first direction, a fifth section (S5) extending in the second direction, and a sixth section (S6) disposed between the fourth and fifth sections (S4, S5), wherein the fourth section (S4) of the first coil pattern (CP1) overlaps the fourth section (S4) of the second coil pattern (CP2), wherein the fifth section (S5) of the first coil pattern (CP1) overlaps the fifth section (S5) of the second coil pattern (CP2), and wherein the sixth section (S6) of the first coil pattern (CP1) does not overlap the sixth section (S6) of the second coil pattern (CP2). [2] The coil component (1) as claimed in claim 1, wherein the sixth portion (S6) of each of the first and second coil patterns (CP1, CP2) includes: a curved part (S6a) arranged near the fourth section (S4) and whose extension direction gradually changes from the first direction to the second direction as it extends from the fourth section (S4) to the fifth section (S5); and a transition part (Sb6) which is arranged in the vicinity of the fifth section (S5) and which shifts the first directional position of the fifth section (S5) outwards in a direction in the plane of the substrate (10). [3] The coil component (1) as claimed in claim 1 or 2, further comprising a magnetic sheet (30) overlapping the first and second coils in the direction of the coil axis, wherein a distance between the sixth portion (S6) of the second coil and a corner part of the magnetic sheet (30) as seen in the direction of the coil axis is greater than a distance between the third portion (S3) of the first coil and the sixth portion (S6) of the second coil as seen in the direction of the coil axis. [4] The coil component (1) as claimed in claim 3, wherein a distance between the second coil and an end edge of the magnetic sheet (30) in a direction in the plane of the substrate (10) is larger than a distance between the second coil and the magnetic sheet (30) in the direction of the coil axis. [5] The coil component (1) as claimed in any one of claims 1 to 4, wherein the first coil includes a third coil pattern (CP3) arranged on one surface of the substrate (10) and a fourth coil pattern (CP4) arranged on the other surface of the substrate (10), wherein an inner peripheral end of the third coil pattern (CP3) is connected to an inner peripheral end of the fourth coil pattern (CP4) by a through conductor (43) penetrating the substrate (10), wherein an outer peripheral end of the third coil pattern (CP3) is connected to a first terminal electrode (E1), wherein an outer peripheral end of the fourth coil pattern (CP4) is connected to a second terminal electrode (E2), wherein a part of the first coil pattern (CP1) overlaps the fourth coil pattern (CP4) in the direction of the coil axis so as to cross between the outer peripheral end of the fourth coil pattern (CP4) and an outermost turn of the fourth coil pattern (CP4), and wherein a part of the second coil pattern (CP2) overlaps the third coil pattern (CP3) in the direction of the coil axis so as to cross between an outer peripheral end of the third coil pattern (CP3) and an outermost turn of the third coil pattern (CP3). [6] The coil component as claimed in claim 5, wherein one end of the second coil is connected to a third terminal electrode (E3), wherein the other end of the second coil is connected to a fourth terminal electrode (E4), and wherein the first and second terminal electrodes (E1, E2) are arranged so as to be between the third and fourth terminal electrodes (E3, E4). [7] A device (90) for wireless energy transmission comprising: a coil component (1) as claimed in any one of claims 1 to 6; a current transmission circuit (91) connected to the first coil; and a communication circuit (92) connected to the second coil.

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