Coil component and wireless power transmission device having the same

Abstract

The technical problem of the present application is to provide a coil component capable of having both power transmission characteristics and communication characteristics. The coil component (1) of the present application includes a power transmission coil (C1) for wireless power transmission, and an antenna coil (C2) for near field wireless communication arranged so as to surround the power transmission coil (C1). The power transmission coil (C1) 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). The gaps between the first, second, and third sections (S1, S2, S3) of the power transmission coil (C1) and the antenna coil (C2) as viewed in the z direction have first, second, and third widths (W1, W2, W3), respectively, the second width (W2) being wider than the first width (W1) and narrower than the third width (W3). Thus, it is possible to have both power transmission characteristics and communication characteristics.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a coil member and a wireless power transmission device provided with the same. BACKGROUND

[0002] The coil member described in Patent Literature 1 has a structure in which a coil pattern for near field communication (NFC) is arranged so as to surround a coil pattern for wireless power transmission.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent Application Publication No. 2015-92569 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] However, in the coil member described in Patent Literature 1, the coil pattern for wireless power transmission is provided in an elliptical shape, and the coil pattern for NFC is provided in a substantially rectangular shape, and thus it is difficult to achieve both power transmission characteristics and communication characteristics.

[0008] Therefore, an object of the present disclosure is to provide a coil member capable of achieving characteristics required for two coils having different functions, and a wireless power transmission device provided with the same.

[0009] MEANS FOR SOLVING PROBLEMS

[0010] The coil member of one embodiment of the present disclosure is provided with a first coil and a second coil arranged so as 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 orthogonal 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, viewed from a coil axis direction, having first, second, and third widths, respectively, the second width being wider than the first width and narrower than the third width.

[0011] EFFECTS OF THE INVENTION

[0012] According to the present disclosure, it is possible to achieve characteristics required for two coils having different functions. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a schematic cross-sectional view for explaining a structure of a coil member 1 of one embodiment.

[0014] Figure 2 is a schematic plan view showing a shape of a conductor pattern formed on one surface 11 of a base material 10.

[0015] Figure 3is a schematic plan view showing the shape of the conductor pattern formed on the other surface 12 of the substrate 10, showing a state observed from the one surface 11 side of the substrate 10, that is, a state observed through the substrate 10.

[0016] Figure 4 is a schematic plan view showing a state in which the first coil pattern CP1 and the third coil pattern CP3 are overlapped with the second coil pattern CP2 and the fourth coil pattern CP4, observed from the one surface 11 side of the substrate 10.

[0017] Figure 5 is a schematic diagram for explaining the function of the coil member 1.

[0018] Figure 6 is a block diagram of a wireless power transmission device 90 using the coil member 1.

[0019] Explanation of reference numerals

[0020] 1 coil member

[0021] 2 partner device

[0022] 3 space

[0023] 10 substrate

[0024] 11 one surface of the substrate

[0025] 12 other surface of the substrate

[0026] 30 magnetic sheet

[0027] 41, 42, 45 conductor pattern

[0028] 43, 44 via conductor

[0029] 90 wireless power transmission device

[0030] 91 power transmission circuit

[0031] 92 communication circuit

[0032] 93 control circuit

[0033] 94 communication line

[0034] 95 power supply

[0035] 110, 120, 130, 140, 150, 160, 210, 220, 230, 240, 250, 260 turn

[0036] 111-114, 121-124, 131-134, 141-144, 151-154, 161, 162, 211-214, 221-224, 231-234, 241-244, 251-254, 261, 262 wire

[0037] 301-304 via conductor

[0038] C1 power transmission coil

[0039] C2 antenna coil

[0040] C3 power reception coil

[0041] C4 antenna coil

[0042] E1-E4 terminal electrode

[0043] S1 first section

[0044] S2 second section

[0045] S3 third section

[0046] S4 fourth section

[0047] S5 fifth section

[0048] S6 sixth section

[0049] S6a curved portion

[0050] S6b transition portion

[0051] magnetic flux DETAILED DESCRIPTION

[0052] Hereinafter, a preferred embodiment of the present disclosure will be described in detail with reference to the accompanying drawings.

[0053] Figure 1 is a schematic cross-sectional view for explaining the structure of the coil member 1 of one embodiment.

[0054] As Figure 1As shown, a coil component 1 of one embodiment comprises: 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 constitute a power transmission coil C1 for wireless power transmission as an example of the first coil. The first coil pattern CP1 and the second coil pattern CP2 constitute an antenna coil C2 for NFC as an example of the 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 so as to overlap in the z direction. In Figure 1 In the example shown, 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 .

[0055] Figure 2 It is a schematic plan view showing the shape of a conductive pattern formed on one surface 11 of the substrate 10 .

[0056] like Figure 2 As shown, 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 and E2 are arranged so that they are sandwiched between the third and fourth terminal electrodes E3 and E4. This ensures that the current flowing through the power transmission coil C1 has approximately equal influence on the third and fourth terminal electrodes E3 and E4. Consequently, the impact of noise caused by the power transmission coil C1 is reduced compared to, for example, a case where the first to fourth terminal electrodes E1 to E4 are arranged sequentially. This also facilitates connection to the equipment in which the coil component 1 is assembled.

[0057] The third coil pattern CP3 has a six-turn structure consisting of turns 110, 120, 130, 140, 150, and 160, with turn 110 located at the outermost circumference and turn 160 located at the innermost circumference. Turns 110, 120, 130, 140, and 150 are radially divided into four parts by three spiral slits. Turn 160, on the other hand, is radially divided into two parts by one spiral slit. Consequently, turn 110 is divided into four parts, forming lines 111 to 114; turn 120 is divided into four parts, forming lines 121 to 124; turn 130 is divided into four parts, forming lines 131 to 134; turn 140 is divided into four parts, forming lines 141 to 144; turn 150 is divided into four parts, forming lines 151 to 154; and turn 160 is divided into two parts, forming lines 161 and 162.

[0058] The lines 111, 121, 131, 141, 151, 161 are continuous lines spirally wound 6 turns, at the outermost periphery of each turn. The lines 112, 122, 132, 142, 152, 162 are continuous lines spirally wound 6 turns, at the second periphery from the outer periphery of each turn. The lines 113, 123, 133, 143, 153 are continuous lines spirally wound 5 turns, at the second periphery from the inner periphery of each turn. The lines 114, 124, 134, 144, 154 are continuous lines spirally wound 5 turns, at the innermost periphery of each turn.

[0059] The outer periphery ends of the lines 111 to 114 are connected to the terminal electrode El. On the other hand, the inner periphery ends of the lines 161, 162, 153, 154 are connected to the through-hole conductors 301 to 304, respectively, which pass through the substrate 10.

[0060] The 3rd coil pattern CP3 includes a 1st section SI extending in the y direction as a 1st direction, a 2nd section S2 extending in the x direction as a 2nd direction, and a 3rd section S3 between the 1st section SI and the 2nd section S2. Here, in a case where the positions where the terminal electrodes El to E4 are arranged are set as the 6 o'clock direction of a clock, the 1st section SI is located in the 3 o'clock direction and the 9 o'clock direction, and the 2nd section S2 is located in the 12 o'clock direction.

[0061] The 1st coil pattern CP1 includes a conductor pattern 41 arranged outside the 3rd coil pattern CP3 in a manner of surrounding the 3rd coil pattern CP3, and a conductor pattern 42 arranged outside the 3rd coil pattern CP3 separately from the conductor pattern 41. Here, the conductor pattern 41 is a continuous line wound about 1 turn, and the 3rd coil pattern CP3 is arranged in an opening region (inner diameter region) of the conductor pattern 41. One end of the conductor pattern 41 is connected to the 3rd terminal electrode E3, and the other end of the conductor pattern 41 is connected to a through-hole conductor 43 which passes through the substrate 10. Further, one end of the conductor pattern 42 is connected to the 4th terminal electrode E4, and the other end of the conductor pattern 42 is connected to a through-hole conductor 44 which passes through the substrate 10.

[0062] The 1st coil pattern CP1 includes a 4th section S4 extending in the y direction, a 5th section S5 extending in the x direction, and a 6th section S6 between the 4th section S4 and the 5th section S5. Here, in a case where the positions where the terminal electrodes El to E4 are arranged are set as the 6 o'clock direction of a clock, the 4th section S4 is located in the 3 o'clock direction and the 9 o'clock direction, and the 5th section S5 is located in the 12 o'clock direction.

[0063] Figure 3 is a schematic plan view showing the shape of the conductor pattern formed on the other surface 12 of the substrate 10, and shows a state observed from the one surface 11 side of the substrate 10, that is, a state observed through the substrate 10.

[0064] As Figure 3 indicated, on the other surface 12 of the substrate 10, a 2nd coil pattern CP2 and a 4th coil pattern CP4 are formed.

[0065] The pattern shape of the 4th coil pattern CP4 is the same as that of the 3rd coil pattern CP3. The 4th coil pattern CP4 is a 6-turn structure composed of turns 210, 220, 230, 240, 250, 260, the turn 210 being located at the outermost periphery and the turn 260 being located at the innermost periphery. Of these, the turns 210, 220, 230, 240, 250 are divided into 4 parts in the radial direction by 3 slits in a spiral shape. On the other hand, the turn 260 is divided into 2 parts in the radial direction by 1 slit in a spiral shape. Thus, the turn 210 is divided into lines 211 to 214 in 4 parts, the turn 220 is divided into lines 221 to 224 in 4 parts, the turn 230 is divided into lines 231 to 234 in 4 parts, the turn 240 is divided into lines 241 to 244 in 4 parts, the turn 250 is divided into lines 251 to 254 in 4 parts, and the turn 260 is divided into lines 261, 262 in 2 parts.

[0066] The lines 211, 221, 231, 241, 251, 261 are continuous lines spirally wound for 6 turns, and are located at the outermost periphery of each turn. The lines 212, 222, 232, 242, 252, 262 are continuous lines spirally wound for 6 turns, and are located at the 2nd periphery from the outer periphery of each turn. The lines 213, 223, 233, 243, 253 are continuous lines spirally wound for 5 turns, and are located at the 2nd periphery from the inner periphery of each turn. The lines 214, 224, 234, 244, 254 are continuous lines spirally wound for 5 turns, and are located at the innermost periphery of each turn.

[0067] The outer periphery ends of the lines 211 to 214 are connected to the 2nd terminal electrode E2 via the via conductors. On the other hand, the inner periphery ends of the lines 261, 262, 253, 254 are connected to the via conductors 304, 303, 302, 301, respectively. Thus, between the 1st terminal electrode E1 and the 2nd terminal electrode E2, the power transmission coil CI having a structure in which 4 lines of 11 turns are connected in parallel is connected.

[0068] As with the 3rd coil pattern CP3, the 4th coil pattern CP4 includes a 1st interval SI extending in the y direction, a 2nd interval S2 extending in the x direction, and a 3rd interval S3 located between the 1st interval SI and the 2nd interval S2.

[0069] The conductor pattern 45 constituting the second coil pattern CP2 is a continuous line wound about 1 turn, and is arranged outside the fourth coil pattern CP4 in a manner so as to surround the fourth coil pattern CP4. That is, the fourth coil pattern CP4 is arranged in an opening region (inner diameter region) 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 via conductors 43, 44, respectively. Thus, the antenna coil C2 constituted by the first coil pattern CP1 and the second coil pattern CP2 is about 2 turns in total.

[0070] 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 between the fourth section S4 and the fifth section S5.

[0071] Figure 4 is a schematic plan view of the state in which the first coil pattern CP1 and the third coil pattern CP3 overlap the second coil pattern CP2 and the fourth coil pattern CP4, as viewed from one surface 11 side of the substrate 10.

[0072] As shown in Figure 4 , the fourth section S4 and the fifth section S5 of the first coil pattern CP1 and the second coil pattern CP2 constituting the antenna coil C2 overlap each other in the z direction, and the sixth section S6 does 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 more outward in the peripheral direction than the conductor pattern 41 constituting the first coil pattern CP1. In this way, by providing the first coil pattern CP1 and the second coil pattern CP2 in a partially overlapping structure, the stray capacitance generated between the first coil pattern CP1 and the second coil pattern CP2 can be reduced, and the size of the antenna coil C2 can be downsized. In particular, since the straight sections S4, S5 overlap, the pattern design is also easy to perform.

[0073] Further, the sixth section S6 has a curved portion S6a located on the fourth section S4 side, which gradually changes the extending direction from the y direction toward the x direction as it extends from the fourth section S4 toward the fifth section S5, and a transition portion S6b located on the fifth section S5 side, which expands the position in the y direction of the fifth section S5 toward the outside in the in-plane direction of the substrate 10. Thus, the width in the y direction of the central portion in the x direction of the opening region of the antenna coil C2 is expanded, and thus, even in the case where the relative position in the y direction of the antenna coil as a communication object deviates, communication can be performed correctly.

[0074] Further, in a case where a first width of a gap between the first section S1 of the power transmitting coil C1 and the fourth section S4 of the antenna coil C2 is set as W1, a second width of a gap between the second section S2 of the power transmitting coil C1 and the fifth section S5 of the antenna coil C2 is set as W2, and a third width of a gap between the third section S3 of the power transmitting coil C1 and the sixth section S6 of the antenna coil C2 is set as W3, the following is satisfied:

[0075] W1 < W2 < W3.

[0076] That is, the second width W2 is wider than the first width W1 and narrower than the third width W3. Thereby, since the width in the x direction of the power transmitting coil C1 can be sufficiently ensured, even in a case where the relative position in the x direction of the power transmitting coil C1 and the power receiving coil deviates, power can be correctly supplied, and since the second width W2 and the third width W3 are wider than the first width W1, the coupling of the power transmitting coil C1 and the antenna coil C2 in this portion is weak, as a result of which good communication characteristics can be obtained. In particular, for the third width W3, since it is wider than the second width W2, the magnetic flux generated by the antenna coil C2 becomes easy to pass 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 becomes the third width W3, not only in the 1 o'clock direction, the 2 o'clock direction, the 10 o'clock direction, and the 11 o'clock direction, but also in the 4 o'clock direction, the 5 o'clock direction, the 7 o'clock direction, and the 8 o'clock direction. That is, the 4 o'clock direction, the 5 o'clock direction, the 7 o'clock direction, and the 8 o'clock direction of the antenna coil C2 have the same pattern shape as the sixth section located in the 1 o'clock direction, the 2 o'clock direction, the 10 o'clock direction, and the 11 o'clock direction, and have the above-described curved portion S6a and the transition portion S6b. In addition, in the present embodiment, the width dimension in the x direction of the power transmitting coil C1 and the antenna coil C2 is larger than the width dimension in the y direction.

[0077] Further, in a case where a distance from the z direction of the sixth section S6 of the antenna coil C2 and the corner of the magnetic sheet 30 is set as W4, the following is satisfied:

[0078] W3 < W4.

[0079] That is, the distance from the z direction of the sixth section S6 of the antenna coil C2 and the corner of the magnetic sheet 30 is larger than the distance from the z direction of the third section S3 of the power transmitting coil C1 and the sixth section S6 of the antenna coil C2. Thereby, even in a case where a metal member exists on the back surface of the magnetic sheet 30, the area of the magnetic sheet 30 located on the outer side of the antenna coil C2 can be sufficiently ensured from the z direction, and thereby the influence of the demagnetizing field generated by the metal member can be reduced.

[0080] Further, as Figure 1As shown, in a case where the distance in the z direction between the antenna coil C2 and the magnetic sheet 30 is set to W0, the following is satisfied:

[0081] W0 < W4.

[0082] That is, the distance in the in-plane direction of the substrate 10 between the antenna coil C2 and the end edge of the magnetic sheet 30 is larger than the distance in the z direction between the antenna coil C2 and the magnetic sheet 30. Due to this, the distance in the z direction between the antenna coil C2 and the magnetic sheet 30 becomes closer, and thus, even in a case where a metal member exists on the back surface of the magnetic sheet 30, it is possible to reduce the influence of the demagnetizing field generated by the metal member.

[0083] Further, the portion of the conductor pattern 41 constituting the first coil pattern CP1, which is located in the vicinity of the through-hole conductor 43, overlaps the fourth coil pattern CP4 in the z direction in a manner that traverses between the outer peripheral end of the fourth coil pattern CP4 and the outermost peripheral turn, that is, in the vicinity of the outer peripheral end of the fourth coil pattern CP4. Similarly, the portion of the conductor pattern 45 constituting the second coil pattern CP2, which is located in the vicinity of the through-hole conductor 43, overlaps the third coil pattern CP3 in the z direction in a manner that traverses between the outer peripheral end of the third coil pattern CP3 and the outermost peripheral turn, that is, in the vicinity of the outer peripheral end of the third coil pattern CP3. Due to this, the overlap between the power transmission coil C1 and the antenna coil C2 is suppressed to a minimum, and thus, it is possible to prevent degradation of the communication characteristics due to stray capacitance between the two.

[0084] Figure 5 is a schematic diagram for explaining the function of the coil member 1.

[0085] As shown in Figure 5 , when the coil member 1 of the present embodiment is opposed to the partner device 2 as a communication object across the space 3, the magnetic flux generated by the power transmission coil C1 links with the power reception coil C3 included in the partner device 2, and thus, wireless power transmission is realized. Further, the magnetic flux generated by the antenna coil C2 links with the antenna coil C4 included in the partner device 2, and thus, wireless communication using NFC is realized.

[0086] As shown above, the coil member 1 of the present embodiment constitutes both the power transmission coil C1 for wireless power transmission and the antenna coil C2 for NFC using the conductor pattern formed on the surface of the substrate 10, and thus, it is possible to reduce the number of parts.

[0087] Figure 6 is a block diagram of a wireless power transmission device 90 using the coil member 1 of the present embodiment.

[0088] Figure 6The illustrated wireless power transmission device 90 is provided with the coil member 1 having the power transmission coil C1 and the antenna coil C2, the power transmission circuit 91 connected to the power transmission coil C1, and the communication circuit 92 connected to the antenna coil C2. The power transmission circuit 91 and the communication circuit 92 are connected to the control circuit 93. Thus, data transmitted and received via the communication line 94 can communicate via the antenna coil C2 for NFC, and power supplied from the power supply 95 can be wirelessly transmitted via the power transmission coil C1 for wireless power transmission.

[0089] The above describes the disclosed preferred embodiments, but the present disclosure is not limited to the above-described embodiments, and various modifications can be made within the scope of the gist of the present disclosure, which of course are included in the scope of the present invention.

[0090] The following structure is included in the technology related to the present disclosure, but is not limited thereto.

[0091] The coil member of the present disclosure is provided with a first coil and a second coil disposed so as 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 orthogonal to the first direction, and a third section between the first section and the second section, gaps between the first, second, and third sections of the first coil and the second coil viewed from a coil axis direction each having a first, second, and third width, the second width being wider than the first width and narrower than the third width. Thus, in a case where the first coil is used as a power transmission coil and the second coil is used as an antenna coil, both power transmission characteristics and communication characteristics can be achieved.

[0092] Also, the coil member of the present disclosure can be further provided with a base material in which the first coil and the second coil are formed, the second coil including a first coil pattern provided on one surface of the base material and a second coil pattern provided on the other surface of the base material, the first coil pattern and the second coil pattern having sections that overlap in the coil axis direction and sections that do not overlap. Thus, the stray capacitance generated between the first coil pattern and the second coil pattern can be reduced, and the size of the second coil can be downsized.

[0093] Further, the first and second coil patterns can include a fourth section extending in the first direction, a fifth section extending in the second direction, and a sixth section between the fourth section and the fifth section, the fourth section of the first coil pattern overlapping the fourth section of the second coil pattern, the fifth section of the first coil pattern overlapping the fifth section of the second coil pattern, and the sixth section of the first coil pattern not overlapping the sixth section of the second coil pattern. Thus, the size of the second coil can be further downsized.

[0094] Further, the sixth interval of the first and second coil patterns can include a curved portion located on the fourth interval side and gradually changing in an extension direction from the first direction to the second direction as it extends from the fourth interval toward the fifth interval, and a transition portion located on the fifth interval side and expanding a position in the first direction of the fifth interval to an outer side in the in-plane direction of the substrate. Thus, in a case where the second coil is used as an antenna coil, even in a case where a relative position in the first direction with respect to an opposing antenna coil as a communication object deviates, communication can be properly performed.

[0095] Further, the coil component of the present disclosure can further include a magnetic sheet overlapping the first coil and the second coil in the coil axis direction, and a distance from the sixth interval of the second coil to a corner of the magnetic sheet can be larger than a distance from the third interval of the first coil to the sixth interval of the second coil as viewed in the coil axis direction. Thus, even in a case where a metal member exists on a back surface of the magnetic sheet, an influence of a demagnetizing field generated by the metal member can be reduced.

[0096] Further, a distance of the second coil from an end edge of the magnetic sheet in the in-plane direction of the substrate can be larger than a distance of the second coil from the magnetic sheet in the coil axis direction. Thus, even in a case where a metal member exists on a back surface of the magnetic sheet, an influence of a demagnetizing field generated by the metal member can be reduced.

[0097] Further, the first coil can 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, an inner peripheral end of the third coil pattern can be connected to an inner peripheral end of the fourth coil pattern via a through-hole conductor provided through the substrate, an outer peripheral end of the third coil pattern can be connected to a first terminal electrode, an outer peripheral end of the fourth coil pattern can be connected to a second terminal electrode, a portion of the first coil pattern can overlap the fourth coil pattern as viewed in the coil axis direction in a manner that traverses between the outer peripheral end of the fourth coil pattern and an outermost turn of the fourth coil pattern, and a portion of the second coil pattern can overlap the third coil pattern as viewed in the coil axis direction in a manner that traverses between the outer peripheral end of the third coil pattern and an outermost turn of the third coil pattern. Thus, in a case where the second coil is used as an antenna coil, degradation of communication characteristics due to stray capacitance between the first coil and the second coil can be prevented.

[0098] Further, one end of the second coil can be connected to a third terminal electrode, the other end of the second coil can be connected to a fourth terminal electrode, and the first and second terminal electrodes can be arranged in a manner of being sandwiched by the third terminal electrode and the fourth terminal electrode. Thus, an influence of noise caused by the first coil becomes smaller, and connection to a device that assembles the coil component also becomes easier.

[0099] Further, the wireless power transmission device of the present disclosure is provided with the above-described coil member, a power transmission circuit connected to the first coil, and a communication circuit connected to the second coil. Thus, wireless power transmission and communication using NFC can be performed.

Claims

1. A coil component, wherein: have: Coil 1; a second coil arranged to surround the first coil; and 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. The gaps between the first section, the second section, and the third section of the first coil and the second coil when viewed from the coil axis direction have a first width, a second width, and a third width, respectively. The second width is wider than the first width and narrower 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 coil pattern and the second coil pattern have overlapping sections and non-overlapping sections in the coil axis direction. The first coil pattern and the second coil pattern include a fourth section extending along the first direction, a fifth section extending along the second direction, and a sixth section located between the fourth section and the fifth section. 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. The sixth section of the first coil pattern does not overlap with the sixth section of the second coil pattern.

2. The coil component according to claim 1, wherein The sixth section of the first coil pattern and the second coil pattern includes: a bending portion located on the fourth section side, wherein the extension direction gradually changes from the first direction toward the second direction as it extends from the fourth section toward the fifth section; and a transition portion located on the fifth section side, which extends the position of the fifth section in the first direction toward the outside in the in-plane direction of the substrate.

3. The coil component according to claim 1 or 2, wherein further comprising: a magnetic sheet overlapping the first coil and the second coil in the coil axis direction; The distance between the sixth section of the second coil viewed from the coil axis direction and the corner of the magnetic sheet is greater than the distance between the third section of the first coil and the sixth section of the second coil viewed from the coil axis direction. The coil component according to claim 3 , wherein: A distance between the second coil and an end edge of the magnetic sheet in the in-plane direction of the substrate is greater than a distance between the second coil and the magnetic sheet in the coil axis direction.

5. A coil component, wherein: have: Coil 1; a second coil arranged to surround the first coil; and 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. The gaps between the first section, the second section, and the third section of the first coil and the second coil when viewed from the coil axis direction have a first width, a second width, and a third width, respectively. The second width is wider than the first width and narrower 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 coil pattern and the second coil pattern have overlapping sections and non-overlapping sections in the coil axis direction. 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. 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 base material. 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. When viewed from the coil axis direction, a portion of the first coil pattern overlaps the fourth coil pattern in a manner that crosses between the outer peripheral end of the fourth coil pattern and the outermost turn of the fourth coil pattern. When viewed from the coil axis direction, a portion of the second coil pattern overlaps 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. The coil component according to claim 5 , wherein One end of the second coil is connected to the third terminal electrode. The other end of the second coil is connected to the fourth terminal electrode. The first terminal electrode and the second terminal electrode are arranged so as to be sandwiched between the third terminal electrode and the fourth terminal electrode.

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

Images