Coil component and wireless power transmission device including same

Abstract

To provide a coil component capable of achieving both a power transmission characteristic and a communication characteristic.SOLUTION: A coil component 1 includes: a power transmission coil C1 for a wireless power transmission; and an antenna coil C2 for a short-range radio communication, arranged in a manner to surround the power transmission coil C1. The power transmission coil C1 includes: a first interval S1 extended in a y direction; a second interval S2 extended in an x direction; and a third interval S3 positioned between the first interval S1 and the second interval S2. Gaps between the first, second, third intervals S1, S2, and S3 of the power transmission coil C1 viewed from a z direction and the antenna coil C2 have first, second, and third widths W1, W2, and W3, respectively. The second width W2 is wider than the first width W1, and is narrower than the third width W3. According to the construction, both of power transmission characteristic and a communication characteristic can be realized.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a coil component and a wireless power transmission device including the same. [Background technology]

[0002] The coil component described in Patent Document 1 has a structure in which a coil pattern for near field wireless communication (NFC) is disposed so as to surround a coil pattern for wireless power transmission. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-92569 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the coil component described in Patent Document 1, the coil pattern for wireless power transmission is elliptical and the coil pattern for NFC is approximately rectangular, making it difficult to achieve both power transmission characteristics and communication characteristics.

[0005] Therefore, an object of the present disclosure is to provide a coil component that can achieve both the characteristics required for two coils with different functions, and a wireless power transmission device including the coil component. [Means for solving the problem]

[0006] A coil component according to one embodiment of the present disclosure comprises a first coil and a second coil arranged to surround the first coil, the first coil including a first section extending in a first direction, a second section extending in a second direction perpendicular to the first direction, and a third section located between the first and second sections, the gaps between the first, second and third sections of the first coil and the second coil when viewed from the coil axis direction have first, second and third widths, respectively, and the second width is wider than the first width and narrower than the third width. Effect of the Invention

[0007] According to the present disclosure, it is possible to achieve compatibility between the characteristics required for two coils with different functions. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic cross-sectional view for illustrating the structure of a coil component 1 according to an embodiment. [Diagram 2] FIG. 2 is a schematic plan view showing the shape of a conductor pattern formed on one surface 11 of the substrate 10. As shown in FIG. [Diagram 3] FIG. 3 is a schematic plan view showing the shape of the conductor pattern formed on the other surface 12 of the substrate 10, as viewed from the side of one surface 11 of the substrate 10, that is, as viewed through the substrate 10. [Figure 4] FIG. 4 is a schematic plan view of the first coil pattern CP1 and the third coil pattern CP3, and the second coil pattern CP2 and the fourth coil pattern CP4, which are overlapped with each other, as viewed from one surface 11 side of the substrate 10. As shown in FIG. [Diagram 5] FIG. 5 is a schematic diagram for explaining the function of the coil device 1. As shown in FIG. [Figure 6] FIG. 6 is a block diagram of a wireless power transmission device 90 using the coil device 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0010] FIG. 1 is a schematic cross-sectional view for illustrating the structure of a coil component 1 according to an embodiment.

[0011] As shown in FIG. 1, a coil component 1 according to an embodiment includes a substrate 10 made of a PET film or the like, 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 coil pattern CP3 and the fourth coil pattern CP4 configure a power transmission coil C1 for wireless power transmission, which is an example of a first coil. The first coil pattern CP1 and the second coil pattern CP2 configure an antenna coil C2 for NFC, which is an example of a second coil. The coil axis direction 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. In the example shown in FIG. 1, one surface 11 of the substrate 10 faces the magnetic sheet 30, but the other surface 12 of the substrate 10 may face the magnetic sheet 30.

[0012] FIG. 2 is a schematic plan view showing the shape of a conductor pattern formed on one surface 11 of the substrate 10. As shown in FIG.

[0013] 2, a first coil pattern CP1, a third coil pattern CP3, and first to fourth terminal electrodes E1 to E4 are formed on one surface 11 of the substrate 10. The first and second terminal electrodes E1, E2 are arranged to be sandwiched between the third terminal electrode E3 and the fourth terminal electrode E4, so that the influence of the current flowing through the power transmitting coil C1 is almost uniform on the third terminal electrode E3 and the fourth terminal electrode E4. Therefore, the influence of noise caused by the power transmitting coil C1 is smaller than, for example, when the first to fourth terminal electrodes E1 to E4 are arranged in this order. In addition, connection to a device in which the coil component 1 is incorporated is also facilitated.

[0014] The third coil pattern CP3 is a six-turn configuration consisting of turns 110, 120, 130, 140, 150, and 160, with the turn 110 located on the outermost periphery and the turn 160 located on the innermost periphery. Among these, the turns 110, 120, 130, 140, and 150 are radially divided into four by three spiral slits. Meanwhile, the turn 160 is radially divided into two by one spiral slit. As a result, the turn 110 is divided into four lines 111 to 114, the turn 120 is divided into four lines 121 to 124, the turn 130 is divided into four lines 131 to 134, the turn 140 is divided into four lines 141 to 144, the turn 150 is divided into four lines 151 to 154, and the turn 160 is divided into two lines 161 and 162.

[0015] Lines 111, 121, 131, 141, 151, and 161 are continuous lines wound in a spiral shape for six turns, and are located on the outermost circumference of each turn. Lines 112, 122, 132, 142, 152, and 162 are continuous lines wound in a spiral shape for six turns, and are located on the second outermost circumference of each turn. Lines 113, 123, 133, 143, and 153 are continuous lines wound in a spiral shape for five turns, and are located on the second innermost circumference of each turn. Lines 114, 124, 134, 144, and 154 are continuous lines wound in a spiral shape for five turns, and are located on the innermost circumference of each turn.

[0016] The outer circumferential ends of the lines 111 to 114 are commonly connected to the first terminal electrode E1, while the inner circumferential ends of the lines 161, 162, 153, and 154 are connected to through-hole conductors 301 to 304 that penetrate the base material 10, respectively.

[0017] The third coil pattern CP3 includes a first section S1 extending in the y direction, which is a first direction, a second section S2 extending in the x direction, which is a second direction, and a third section S3 located between the first section S1 and the second section S2. If the position where the terminal electrodes E1 to E4 are arranged is the 6 o'clock direction on a clock, the first section S1 is located at the 3 o'clock and 9 o'clock directions, and the second section S2 is located at the 12 o'clock direction.

[0018] 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 separately from the conductor pattern 41. Of these, the conductor pattern 41 is a continuous line wound about one turn, and the third coil pattern CP3 is arranged in its opening region (inner diameter region). One end of the conductor pattern 41 is connected to the third terminal electrode E3, and the other end of the conductor pattern 41 is connected to a through-hole conductor 43 penetrating the substrate 10. In addition, one end of the conductor pattern 42 is connected to the fourth terminal electrode E4, and the other end of the conductor pattern 42 is connected to a through-hole conductor 44 penetrating the substrate 10.

[0019] 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 section S4 and the fifth section S5. When the position where the terminal electrodes E1 to E4 are arranged is the 6 o'clock direction on a clock, the fourth section S4 is located at the 3 o'clock and 9 o'clock directions, and the fifth section S5 is located at the 12 o'clock direction.

[0020] FIG. 3 is a schematic plan view showing the shape of the conductor pattern formed on the other surface 12 of the substrate 10, as viewed from the side of one surface 11 of the substrate 10, that is, as viewed through the substrate 10.

[0021] As shown in FIG. 3, on the other surface 12 of the base material 10, a second coil pattern CP2 and a fourth coil pattern CP4 are formed.

[0022] The pattern shape of the fourth coil pattern CP4 is the same as that of the third coil pattern CP3. The fourth coil pattern CP4 is a six-turn configuration consisting of turns 210, 220, 230, 240, 250, and 260, with the turn 210 located on the outermost periphery and the turn 260 located on the innermost periphery. Of these, the turns 210, 220, 230, 240, and 250 are radially divided into four by three spiral slits. On the other hand, the turn 260 is radially divided into two by one spiral slit. As a result, turn 210 is divided into four parts, namely lines 211 to 214, turn 220 is divided into four parts, namely lines 221 to 224, turn 230 is divided into four parts, namely lines 231 to 234, turn 240 is divided into four parts, namely lines 241 to 244, turn 250 is divided into four parts, namely lines 251 to 254, and turn 260 is divided into two parts, namely lines 261 and 262.

[0023] Lines 211, 221, 231, 241, 251, and 261 are continuous lines wound in a spiral shape for six turns, and are located on the outermost circumference of each turn. Lines 212, 222, 232, 242, 252, and 262 are continuous lines wound in a spiral shape for six turns, and are located on the second outermost circumference of each turn. Lines 213, 223, 233, 243, and 253 are continuous lines wound in a spiral shape for five turns, and are located on the second innermost circumference of each turn. Lines 214, 224, 234, 244, and 254 are continuous lines wound in a spiral shape for five turns, and are located on the innermost circumference of each turn.

[0024] The outer peripheral ends of the lines 211 to 214 are commonly connected to the second terminal electrode E2 via through-hole conductors. Meanwhile, the inner peripheral ends of the lines 261, 262, 253, and 254 are respectively connected to the through-hole conductors 304, 303, 302, and 301. As a result, the power transmitting coil C1 having a configuration in which four 11-turn lines are connected in parallel is connected between the first terminal electrode E1 and the second terminal electrode E2.

[0025] Like the third coil pattern CP3, the fourth coil pattern CP4 includes 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 section S1 and the second section S2.

[0026] The conductor pattern 45 constituting the second coil pattern CP2 is a continuous line wound about one turn, and is arranged outside the fourth coil pattern CP4 so as to surround the fourth coil pattern CP4. In other words, 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-hole conductors 43 and 44, respectively. As a result, the antenna coil C2 consisting of the first coil pattern CP1 and the second coil pattern CP2 has a total of about two turns.

[0027] 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 section S4 and the fifth section S5.

[0028] FIG. 4 is a schematic plan view of the first coil pattern CP1 and the third coil pattern CP3, and the second coil pattern CP2 and the fourth coil pattern CP4, which are overlapped with each other, as viewed from one surface 11 side of the substrate 10. As shown in FIG.

[0029] As shown in FIG. 4, the first coil pattern CP1 and the second coil pattern CP2 constituting the antenna coil C2 overlap each other in the z direction in the fourth sections S4 and overlap each other in the z direction in the fifth sections S5, while the sixth sections S6 do not overlap each other in the z direction. Although not particularly limited, in the sixth section S6, the conductor pattern 45 constituting the second coil pattern CP2 is located on the outer periphery side of the conductor pattern 41 constituting the first coil pattern CP1. In this way, by configuring the first coil pattern CP1 and the second coil pattern CP2 to partially overlap, it is possible to reduce the size of the antenna coil C2 while reducing the stray capacitance generated between the first coil pattern CP1 and the second coil pattern CP2. In particular, since the sections S4 and S5 extending linearly overlap, pattern design is also easy.

[0030] The sixth section S6 has a curved section S6a located on the fourth section S4 side, where the extending direction from the fourth section S4 to the fifth section S5 gradually changes from the y direction to the x direction, and a transition section S6b located on the fifth section S5 side, where the position of the fifth section S5 in the y direction is expanded outward in the in-plane direction of the substrate 10. As a result, the width of the opening region of the antenna coil C2 in the y direction is expanded at the center in the x direction, so that correct communication can be performed even if the relative position in the y direction with respect to the antenna coil with which communication is to be performed is shifted.

[0031] Furthermore, if a first width of the gap between the first section S1 of the power transmitting coil C1 and the fourth section S4 of the antenna coil C2 is denoted as W1, a second width of the gap between the second section S2 of the power transmitting coil C1 and the fifth section S5 of the antenna coil C2 is denoted as W2, and a third width of the gap between the third section S3 of the power transmitting coil C1 and the sixth section S6 of the antenna coil C2 is denoted as W3, then W1 <W2<W3 That is, the second width W2 is wider than the first width W1 and narrower than the third width W3. As a result, the width of the power transmitting coil C1 in the x direction is sufficiently secured, so that even if the relative positions of the power transmitting coil C1 and the power receiving coil in the x direction are misaligned, power can be fed correctly. Furthermore, since the second width W2 and the third width W3 are wider than the first width W1, the coupling between the power transmitting coil C1 and the antenna coil C2 is weakened in this portion, so that good communication characteristics can be obtained. In particular, since the third width W3 is wider than the second width W2, the magnetic flux generated by the antenna coil C2 easily passes through the third width W3, and the communication characteristics are further improved. The gap between the power transmitting coil C1 and the antenna coil C2 is 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, the 4 o'clock, 5 o'clock, 7 o'clock, and 8 o'clock directions of the antenna coil C2 have a pattern shape similar to that of the sixth section located at the 1 o'clock, 2 o'clock, 10 o'clock, and 11 o'clock directions, and have the curved portion S6a and transition portion S6b described above. Note that in this embodiment, the width dimension of the power transmitting coil C1 and the antenna coil C2 in the x direction is larger than the width dimension in the y direction.

[0032] In addition, when the distance between the sixth section S6 of the antenna coil C2 and the corner portion of the magnetic sheet 30 as viewed in the z direction is W4, W3 <W4 In other words, the distance between the sixth section S6 of the antenna coil C2 and the corner portion of the magnetic sheet 30 as viewed in the z direction is greater than the distance between the third section S3 of the power transmission coil C1 and the sixth section S6 of the antenna coil C2 as viewed in the z direction. As a result, even if a metal member is present on the back surface of the magnetic sheet 30, the area of ​​the magnetic sheet 30 located outside the antenna coil C2 as viewed in the z direction is sufficiently secured, thereby reducing the influence of the demagnetizing field generated by the metal member.

[0033] Furthermore, as shown in FIG. 1, if the distance in the z direction between the antenna coil C2 and the magnetic sheet 30 is W0, W0 <W4 In other words, the distance between the antenna coil C2 and the magnetic sheet 30 in the z direction is greater than the distance between the antenna coil C2 and the edge of the magnetic sheet 30 in the in-plane direction of the base material 10. As a result, the distance between the antenna coil C2 and the magnetic sheet 30 in the z direction is reduced, so that even if a metal member is present on the back surface of the magnetic sheet 30, the influence of the demagnetizing field generated by the metal member is reduced.

[0034] In addition, a portion of the conductor pattern 41 constituting the first coil pattern CP1 that is located near the through-hole conductor 43 overlaps with the fourth coil pattern CP4 in the z-direction so as to cross the vicinity of the outer peripheral end of the fourth coil pattern CP4, i.e., between the outer peripheral end and the outermost turn of the fourth coil pattern CP4. Similarly, a portion of the conductor pattern 45 constituting the second coil pattern CP2 that is located near the through-hole conductor 43 overlaps with the third coil pattern CP3 in the z-direction so as to cross the vicinity of the outer peripheral end of the third coil pattern CP3, i.e., between the outer peripheral end and the outermost turn of the third coil pattern CP3. This minimizes the overlap between the power transmission coil C1 and the antenna coil C2, thereby preventing deterioration of communication characteristics caused by stray capacitance between them.

[0035] FIG. 5 is a schematic diagram for explaining the function of the coil device 1. As shown in FIG.

[0036] 5, when the coil component 1 according to this embodiment and a counterpart device 2 with which communication is to be performed are placed opposite each other across a space 3, a magnetic flux φ1 generated by the power transmitting coil C1 interlinks with a power receiving coil C3 included in the counterpart device 2, thereby realizing wireless power transmission. Also, a magnetic flux φ2 generated by the antenna coil C2 interlinks with an antenna coil C4 included in the counterpart device 2, thereby realizing wireless communication by NFC.

[0037] In this way, the coil component 1 according to this embodiment constitutes both the power transmission coil C1 for wireless power transmission and the antenna coil C2 for NFC by the conductor pattern formed on the surface of the substrate 10, making it possible to reduce the number of components.

[0038] FIG. 6 is a block diagram of a wireless power transmission device 90 using the coil component 1 according to the present embodiment.

[0039] 6 includes a coil part 1 having a power transmitting coil C1 and an antenna coil C2, a power transmitting circuit 91 connected to the power transmitting coil C1, and a communication circuit 92 connected to the antenna coil C2. The power transmitting circuit 91 and the communication circuit 92 are connected to a control circuit 93. As a result, data transmitted and received via a communication line 94 can be communicated via the antenna coil C2 for NFC, and power supplied by a power source 95 can be wirelessly transmitted via the power transmitting coil C1 for wireless power transmission.

[0040] Although the above describes preferred embodiments of the present disclosure, the present disclosure is not limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the present disclosure, and it goes without saying that these modifications are also included within the scope of the present disclosure.

[0041] The technology according to the present disclosure includes the following configuration examples, but is not limited to these.

[0042] 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 including a first section extending in a first direction, a second section extending in a second direction perpendicular to the first direction, and a third section located between the first section and the second section, the gaps between the first section, the second section, and the third section of the first coil as viewed from the coil axial direction have first, second, and third widths, respectively, the second width being wider than the first width and narrower than the third width. This makes it possible to achieve both power transmission characteristics and communication characteristics when the first coil is used as a power transmission coil and the second coil is used as an antenna coil.

[0043] The coil component according to the present disclosure further includes a substrate on which a first coil and a second coil are formed, the second coil including 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 coil pattern and the second coil pattern may have sections that overlap and sections that do not overlap in the coil axis direction. This makes it possible to reduce the size of the second coil while reducing the stray capacitance generated between the first coil pattern and the second coil pattern.

[0044] Furthermore, the first and second coil patterns each include a fourth section extending in the first direction, a fifth section extending in the second direction, and a sixth section located between the fourth and fifth sections, and the fourth section of the first coil pattern overlaps with the fourth section of the second coil pattern, the fifth section of the first coil pattern overlaps with the fifth section of the second coil pattern, and the sixth section of the first coil pattern does not necessarily overlap with the sixth section of the second coil pattern. This allows the size of the second coil to be further reduced.

[0045] Furthermore, the sixth section of the first and second coil patterns may include a curved section located on the fourth section side, the extension direction of which gradually changes from the first direction to the second direction from the fourth section to the fifth section, and a transition section located on the fifth section side, which widens the position of the fifth section in the first direction outward in the in-plane direction of the substrate. This makes it possible to perform correct communication even if the relative position in the first direction with respect to the antenna coil of the other party with which the communication is to be performed is shifted when the second coil is used as an antenna coil.

[0046] The coil component according to the present disclosure may further include a magnetic sheet overlapping the first coil and the second coil in the coil axial direction, and the distance between the sixth section of the second coil and a corner of the magnetic sheet as viewed from the coil axial direction may be greater than the distance between the third section of the first coil and the sixth section of the second coil as viewed from the coil axial direction. This reduces the effect of the demagnetizing field generated by a metal member even if a metal member is present on the back surface of the magnetic sheet.

[0047] In addition, the distance between the second coil and the edge of the magnetic sheet in the in-plane direction of the substrate may be greater than the distance between the second coil and the magnetic sheet in the coil axis direction. This reduces the effect of the demagnetizing field generated by a metal member even if a metal member is present on the back surface of the magnetic sheet.

[0048] 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, the inner peripheral end of the third coil pattern is connected to the inner peripheral end of the fourth coil pattern via a through-hole conductor provided through the substrate, the outer peripheral end of the third coil pattern is connected to the first terminal electrode, the outer peripheral end of the fourth coil pattern is connected to the second terminal electrode, a part of the first coil pattern may overlap with the fourth coil pattern so as to cross between the outer peripheral end of the fourth coil pattern and the outermost turn of the fourth coil pattern as viewed from the coil axis direction, and a part of the second coil pattern may overlap with the third coil pattern so as to cross between the outer peripheral end of the third coil pattern and the outermost turn of the third coil pattern as viewed from the coil axis direction. This can prevent deterioration of communication characteristics caused by stray capacitance between the first coil and the second coil when the second coil is used as an antenna coil.

[0049] Also, one end of the second coil may be connected to the third terminal electrode, the other end of the second coil may be connected to the fourth terminal electrode, and the first and second terminal electrodes may be disposed between the third terminal electrode and the fourth terminal electrode. This reduces the effect of noise from the first coil and also facilitates connection to a device incorporating the coil component.

[0050] A wireless power transmission device according to the present disclosure includes the coil component, a power transmission circuit connected to the first coil, and a communication circuit connected to the second coil, which enables wireless power transmission and NFC communication. [Explanation of symbols]

[0051] 1 Coil parts 2. Counterpart device 3 space 10 Base material 11 One surface of the substrate 12 Other surface of the substrate 30 Magnetic Sheet 41, 42, 45 Conductor pattern 43,44 Through hole conductor 90 Wireless power transmission device 91 Power Transmission Circuit 92 Communication Circuits 93 Control circuit 94 Communication Line 95 Power supply 110,120,130,140,150,160,210,220,230,240,250,260 turns 111~114, 121~124, 131~134, 141~144, 151~154, 161, 162, 211~214, 221~224, 231~234, 241~244, 251~254, 261, 262 Line 301~304 Through hole conductor C1 Transmitting coil C2 Antenna coil C3 receiving coil C4 Antenna Coil E1~E4 terminal electrode S1 1st Section S2 2nd Section S3 3rd Section S4 4th Section S5 5th Section S6 6th Section S6a Curved section S6b transition part φ1,φ2 magnetic flux

Claims

1. A first coil; A second coil disposed so as to surround the first coil; a substrate on which the first coil and the second coil are formed, the first coil includes a first section extending in a first direction, a second section extending in a second direction perpendicular to the first direction, and a third section located between the first section and the second section; Gaps between the first, second and third sections of the first coil and the second coil as viewed from a coil axial direction have first, second and third widths, respectively; The second width is greater than the first width and less than the third width, the second coil includes a first coil pattern provided on one surface of the substrate and a second coil pattern provided on the other surface of the substrate, the first and second coil patterns include two fourth sections extending in the first direction, a fifth section extending in the second direction, and two sixth sections each located between the two fourth sections and the fifth section, two fourth sections of the first coil pattern overlap with two fourth sections of the second coil pattern, respectively; a fifth section of the first coil pattern overlaps with a fifth section of the second coil pattern; A coil component, wherein the two sixth sections of the first coil pattern do not overlap with the two sixth sections of the second coil pattern, respectively.

2. 2. The coil component according to claim 1, wherein the sixth section of the first and second coil patterns includes a curved portion located on the fourth section side, the extension direction of which gradually changes from the first direction to the second direction from the fourth section to the fifth section, and a transition portion located on the fifth section side, which widens the position of the fifth section in the first direction outward in an in-plane direction of the substrate.

3. a magnetic sheet overlapping the first coil and the second coil in the coil axis direction; 3. The coil component according to claim 1, wherein the distance between the sixth section of the second coil and a corner portion of the magnetic sheet as viewed in the coil axis direction is greater than the distance between the third section of the first coil and the sixth section of the second coil as viewed in the coil axis direction.

4. The coil component according to claim 3 , wherein a distance between the second coil and the magnetic sheet in the coil axis direction is greater than a distance between the second coil and an edge of the magnetic sheet in an in-plane direction of the base material.

5. the first coil includes a third coil pattern provided on the one surface of the substrate and a fourth coil pattern provided on the other surface of the substrate, an inner peripheral end of the third coil pattern is connected to an inner peripheral end of the fourth coil pattern via a through-hole conductor provided to penetrate the base material; an outer circumferential end of the third coil pattern is connected to a first terminal electrode; An outer circumferential end of the fourth coil pattern is connected to a second terminal electrode, a portion of the first coil pattern overlaps with the fourth coil pattern so as to cross between the outer peripheral end of the fourth coil pattern and an outermost turn of the fourth coil pattern when viewed from the coil axis direction; 5. The coil component according to claim 1, wherein a portion of the second coil pattern overlaps with the third coil pattern so as to cross between the outer peripheral end of the third coil pattern and the outermost turn of the third coil pattern when viewed from the coil axis direction.

6. 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, The coil component according to claim 5 , wherein the first and second terminal electrodes are disposed so as to be sandwiched between the third terminal electrode and the fourth terminal electrode.

7. The coil component according to any one of claims 1 to 6, A power transmission circuit connected to the first coil; A wireless power transmission device comprising: a communication circuit connected to the second coil.

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