Coil component and wireless power transmission device having the same

Abstract

The technical problem of the present invention is to provide a coil component that can efficiently expand the communicable area. The coil component (100) of the present invention comprises: a first coil pattern (CP1); a second coil pattern (CP2) connected to the first coil pattern (CP1); and a magnetic body (7) covering the first and second coil patterns (CP1, CP2) from the z direction, the first and second coil patterns (CP1, CP2) are arranged side by side in the x direction, and the first coil pattern (CP1) has: a first protrusion that protrudes from the outer peripheral end (51) of the magnetic body (7) in the y direction to the y direction. Thus, a coil component that can efficiently expand the communicable area can be provided.

Description

Technical Field

[0001] The present invention relates to a coil component and a wireless power transmission device having the same. Background Art

[0002] As a method of adjusting a communicable area by near field wireless communication (NFC), there is known a method of providing a sub-coil antenna connected to the main coil antenna in addition to the main coil antenna as described in Patent Document 1.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: International Publication No. WO2013 / 073314 Summary of the invention

[0006] Problems to be solved by the invention

[0007] However, the device described in Patent Document 1 has a problem in that the communicable area cannot be expanded efficiently.

[0008] Therefore, an object of the present disclosure is to provide a coil component capable of efficiently expanding a communicable area and a wireless power transmission device including the coil component.

[0009] Means used to solve problems

[0010] A coil component of one embodiment of the present disclosure comprises: a first coil pattern; a second coil pattern connected to the first coil pattern; and a magnetic body covering the first and second coil patterns from the axial direction, the first and second coil patterns are arranged side by side in a first direction orthogonal to the axial direction, and the first coil pattern has: a first protrusion protruding from the first outer peripheral end of the magnetic body in a second direction orthogonal to the axial direction and the first direction toward the second direction.

[0011] Effects of the Invention

[0012] According to the present disclosure, it is possible to provide a coil component capable of efficiently expanding a communicable area and a wireless power transmission device including the coil component. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic top view of a terminal holder 1 in which a coil component according to one embodiment is built.

[0014] Figure 2 It is a schematic plan view showing a state where the smartphone 3 is placed in an offset manner.

[0015] Figure 3 It is a schematic plan view for explaining the structure of coil component 100 according to one embodiment.

[0016] Figure 4 It is along Figure 3 A schematic cross-sectional view taken along line AA is shown.

[0017] Figure 5 It is along Figure 3 A schematic cross-sectional view taken along line BB is shown.

[0018] Figure 6 It is along Figure 3 A schematic cross-sectional view taken along line CC is shown.

[0019] Figure 7 It is along Figure 3 A schematic cross-sectional view taken along line DD is shown.

[0020] Figure 8 This is a schematic diagram for explaining the positional relationship between the first to third coil patterns CP1 to CP3 and the magnetic body 7 in more detail.

[0021] Fig. 9 It is a schematic diagram for explaining the change of magnetic flux due to the position of the outer peripheral end 52 of the magnetic body 7.

[0022] Fig.10 It is a schematic plan view for explaining the structure of a coil component 100a according to a modification.

[0023] Fig.11 is a block diagram of a wireless power transmission apparatus 60 using the coil component 100 .

[0024] Description of Reference Numerals

[0025] 1 Terminal bracket

[0026] 2 Loading surface

[0027] 3. Smartphone

[0028] 4 Substrate

[0029] 4a, 4b Surface of substrate

[0030] 6 Insulation components

[0031] 7 Magnetic body

[0032] 8 Metal components

[0033] 11, 12, 21, 22, 31, 32, 41, 42 conductor pattern

[0034] 23, 33, 43 through-hole conductors

[0035] 51~54 outer edge

[0036] 60 Wireless power transmission equipment

[0037] 61 Communication circuit

[0038] 62 Power transmission circuit

[0039] 63 Control circuit

[0040] 64 communication lines

[0041] 65 Power Supply

[0042] 100, 100a Coil components

[0043] E1, E2 terminals

[0044] S11~S14、S21~S24、S31~S34 Section DETAILED DESCRIPTION

[0045] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0046] Figure 1 It is a schematic plan view of a terminal bracket 1 in which a coil component according to an embodiment is incorporated.

[0047] Figure 1 The terminal holder 1 shown has: a placement surface 2 for placing a mobile terminal such as a smartphone 3. The placement surface 2 has an xy plane. In the lower part of the placement surface 2 in the z direction, there are arranged: a coil pattern for near field wireless communication (NFC) and a coil pattern for wireless power transmission described later. Thus, when the smartphone 3 is placed on the terminal holder 1, near field wireless communication can be performed between the terminal holder 1 and the smartphone 3, and the smartphone 3 can be charged by wireless power transmission. The device in which the coil component of the present disclosure is built-in is not limited to Figure 1 The terminal holder 1 shown is not particularly limited as long as it is a device installed on a center console in a car or the like and capable of mounting the smartphone 3 .

[0048] exist Figure 1 In the figure, the smartphone 3 is placed at the approximate center of the placement surface 2 in the x direction. Since the width of the placement surface 2 in the x direction is longer than the length of the smartphone 3 in the x direction, it is assumed that Figure 2 (a) shows a case where the smartphone 3 is placed offset in the +x direction (3 o'clock direction), or Figure 2 As shown in (b), the smartphone 3 is placed offset in the -x direction (9 o'clock direction). Therefore, the terminal holder 1 needs to be designed so that short-range wireless communication can be performed even when the smartphone 3 is placed offset.

[0049] Figure 3 1 is a schematic plan view for explaining the structure of a coil component 100 according to one embodiment. Figure 4 It is along Figure 3 The schematic cross-sectional view of the AA line shown in FIG. Figure 5 It is along Figure 3 The schematic cross-sectional view of line BB shown in FIG. Figure 6 It is along Figure 3 The schematic cross-sectional view of the CC line shown, Figure 7 It is along Figure 3 A schematic cross-sectional view taken along line DD is shown.

[0050] like Figure 3 to Figure 7 As shown, the coil component 100 of the present embodiment comprises: a substrate 4 formed of a PET film or the like, the first to fourth coil patterns CP1 to CP4 arranged on the surfaces 4a and 4b of the substrate 4, and a magnetic body 7. On the back side of the magnetic body 7, there is a metal component 8 formed of a frame or a circuit substrate of the terminal bracket 1. That is, the magnetic body 7 is arranged between the first to fourth coil patterns CP1 to CP4 and the metal component 8. Normally, if the metal component 8 exists near the coil pattern, the antenna efficiency decreases, but since the magnetic body 7 is arranged between the two, the magnetic body 7 functions as a magnetic circuit, which can suppress the decrease in antenna efficiency. The upper surface of the first to fourth coil patterns CP1 to CP4 is covered by an insulating component 6 formed of a frame or a protective film of the terminal bracket 1. The surface structure of the insulating component 6 Figure 1 The mounting surface 2 of the terminal bracket 1 is shown.

[0051] The first to third coil patterns CP1 to CP3 are antenna coils for NFC, and the fourth coil pattern CP4 is a power transmission coil for wireless power transmission. The first to third coil patterns CP1 to CP3 are arranged side by side in such a way that the first coil pattern CP1 is sandwiched between the second coil pattern CP2 and the third coil pattern CP3 in the x direction. Among them, the first coil pattern CP1 located in the center is the main antenna that mainly undertakes the communication in the approximately central part in the x direction, and the second and third coil patterns CP2 and CP3 located on both sides are sub-antennas for expanding the communicable area in the x direction. The axial directions of the first to third coil patterns CP1 to CP3 are all in the z direction. In this way, since the second and third coil patterns CP2 and CP3 as sub-antennas are arranged on both sides of the first coil pattern CP1 as the main antenna, the communicable area is expanded in the x direction. As a result, no matter where the smartphone 3 is placed on the placement surface 2, short-range wireless communication can be performed correctly. In addition, the x direction is an example of the first direction, and the y direction is an example of the second direction.

[0052] The first to third coil patterns CP1 to CP3 each have an opening. Figure 3 to Figure 7In the example shown, the opening width of the first coil pattern CP1 in the x direction is larger than the opening width of the second and third coil patterns CP2 and CP3 in the x direction. For the opening width in the y direction, the first to third coil patterns CP1 to CP3 are substantially the same. The fourth coil pattern CP4 is arranged in the opening area of ​​the first coil pattern CP1. The axial direction of the fourth coil pattern CP4 is also the z direction. The coil axis of the first coil pattern CP1 and the coil axis of the fourth coil pattern CP4 can also be consistent, or the positions in the x direction or y direction can be different from each other. In this way, since the fourth coil pattern CP4 is arranged in the opening area of ​​the first coil pattern CP1, the first to fourth coil patterns CP1 to CP4 can be formed on the surface of the substrate 4, and the number of components can be reduced. In addition, since the first to fourth coil patterns CP4 can be formed at the same time, the manufacturing process can also be simplified.

[0053] The first coil pattern CP1 is composed of a conductor pattern 11 formed on the surface 4a of the substrate 4 and a conductor pattern 12 formed on the surface 4b of the substrate 4. The second coil pattern CP2 is composed of a conductor pattern 21 formed on the surface 4a of the substrate 4, a conductor pattern 22 formed on the surface 4b of the substrate 4, and a through-hole conductor 23 provided to penetrate the substrate 4 and connect the conductor patterns 21 and 22. The third coil pattern CP3 is composed of a conductor pattern 31 formed on the surface 4a of the substrate 4, a conductor pattern 32 formed on the surface 4b of the substrate 4, and a through-hole conductor 33 provided to penetrate the substrate 4 and connect the conductor patterns 31 and 32. The fourth coil pattern CP4 is composed of a conductor pattern 41 formed on the surface 4a of the substrate 4, a conductor pattern 42 formed on the surface 4b of the substrate 4, and a through-hole conductor 43 provided to penetrate the substrate 4 and connect the conductor patterns 41 and 42. The first to third coil patterns CP1 to CP3 are connected in series, thereby forming a single antenna coil.

[0054] exist Figure 3 to Figure 7 In the example shown, the number of turns of the first coil pattern CP1 is about 1 turn, and the number of turns of the second and third coil patterns CP2 and CP3 are about 2 turns respectively. There is no particular limitation on the number of turns of the first to third coil patterns CP1 to CP3. Figure 3 to Figure 7 As shown in the example, if the number of turns of the second and third coil patterns CP2 and CP3 as the sub-antenna is made larger than the number of turns of the first coil pattern CP1 as the main antenna, the antenna characteristics on both sides of the x direction are improved. On the other hand, if the number of turns of the first coil pattern CP1 as the main antenna is made larger than the number of turns of the second and third coil patterns CP2 and CP3 as the sub-antenna, the antenna characteristics of the approximately central part in the x direction are improved. The fourth coil pattern CP4 is a power transmission coil for wireless power transmission, which requires a large inductance, and therefore, its number of turns is larger than the number of turns of the first to third coil patterns CP1 to CP3.

[0055] The entirety of the fourth coil pattern CP4 for wireless power transmission is covered by the magnetic body 7 from the z direction. In contrast, although most of the opening areas of the first to third coil patterns CP1 to CP3 for NFC overlap with the magnetic body 7 in the z direction, a portion of the opening areas do not overlap with the magnetic body 7. That is, the first to third coil patterns CP1 to CP3 each have a protrusion protruding from the outer peripheral end of the magnetic body 7 in the x direction or the y direction.

[0056] Figure 8 This is a schematic diagram for explaining the positional relationship between the first to third coil patterns CP1 to CP3 and the magnetic body 7 in more detail.

[0057] like Figure 8 As shown, the magnetic body 7 has outer peripheral ends 51 to 54. The outer peripheral end 51 is an end in the +y direction (12 o'clock direction) and extends in the x direction. The outer peripheral end 52 is an end in the +x direction (3 o'clock direction) and extends in the y direction. The outer peripheral end 53 is an end in the -x direction (9 o'clock direction) and extends in the y direction. The outer peripheral end 54 is an end in the -y direction (6 o'clock direction) and extends in the x direction. Here, the width Wy of the magnetic body 7 in the y direction, that is, the distance from the outer peripheral end 51 to the outer peripheral end 54 is smaller than the opening width Dy in the y direction of the first to third coil patterns CP1 to CP3. On the other hand, the width Wx of the magnetic body 7 in the x direction, that is, the distance from the outer peripheral end 52 to the outer peripheral end 53 is larger than the opening width Dx in the x direction of the first coil pattern CP1. In addition, the outer peripheral end 51 is an example of a first outer peripheral end, the outer peripheral end 52 is an example of a second outer peripheral end, and the outer peripheral end 53 is an example of a third outer peripheral end.

[0058] The first coil pattern CP1 has sections S11 to S14. Section S11 is located in the +y direction (12 o'clock direction) and extends in the x direction. Section S12 is located in the +x direction (3 o'clock direction) and extends in the y direction. Section S13 is located in the -x direction (9 o'clock direction) and extends in the y direction. Section S14 is located in the -y direction (6 o'clock direction) and extends in the x direction. Here, most of sections S12 and S13 overlap with the magnetic body 7, while sections S11 and S14 do not overlap with the magnetic body 7. That is, section S11 constitutes a protrusion (first protrusion) protruding from the outer peripheral end 51 of the magnetic body 7 in the +y direction, and section S14 constitutes a protrusion protruding from the outer peripheral end 54 of the magnetic body 7 in the -y direction. Thus, since the sections S11 and S14 of the first coil pattern CP1 constitute protrusions that do not overlap the magnetic body 7 in the z direction, the spread of the magnetic flux in the ±y directions is suppressed, and the magnetic flux spreads in the ±x directions accordingly.

[0059] Section S11 is composed of conductor pattern 12, and section S14 is composed of conductor pattern 11. The portion of section S12 composed of conductor pattern 12 is connected to one end of conductor pattern 21 constituting the second coil pattern CP2 via conductor pattern 22 and through-hole conductor 23. Furthermore, the other end of conductor pattern 21 is connected to the portion of section S12 composed of conductor pattern 11. Similarly, the portion of section S13 composed of conductor pattern 12 is connected to one end of conductor pattern 31 constituting the third coil pattern CP3 via conductor pattern 32 and through-hole conductor 33. Furthermore, the other end of conductor pattern 31 is connected to the portion of section S13 composed of conductor pattern 11. Section S14 is terminated at a pair of terminals E1 and E2. In addition, at Figure 8 In the example shown, there is a connection pattern extending along the x direction that connects the conductor pattern 12 and the conductor pattern 22, and there is a connection pattern extending along the x direction that connects the conductor pattern 11 and the conductor pattern 21. The width of these connection patterns in the x direction is smaller than the opening width of the second coil pattern CP2 in the x direction. Similarly, there is a connection pattern extending in the x direction that connects the conductor pattern 12 and the conductor pattern 32, and there is a connection pattern extending in the x direction that connects the conductor pattern 11 and the conductor pattern 31. The width of these connection patterns in the x direction is smaller than the opening width of the third coil pattern CP3 in the x direction.

[0060] The winding directions of the first coil pattern CP1 and the second and third coil patterns CP2 and CP3 are opposite to each other. For example, when the current flows from the terminal E1 to the terminal E2, the current flows to the left (counterclockwise) in the first coil pattern CP1, and the current flows to the right (clockwise) in the second and third coil patterns CP2 and CP3. In this way, the first to third coil patterns CP1 to CP3 are connected in such a way that the magnetic field generated from the first coil pattern CP1 and the magnetic field generated from the second and third coil patterns CP2 and CP3 are in opposite phases to each other, thereby, the magnetic field generated from the first coil pattern CP1 and the magnetic field generated from the second and third coil patterns CP2 and CP3 become mainly mutually reinforcing.

[0061] The second coil pattern CP2 has sections S21 to S24. Section S21 is located in the +y direction (12 o'clock direction) and extends in the x direction. Section S22 is located in the +x direction (3 o'clock direction) and extends in the y direction. Section S23 is located in the -x direction (9 o'clock direction) and extends in the y direction. Section S24 is located in the -y direction (6 o'clock direction) and extends in the x direction. Here, most of section S23 overlaps with the magnetic body 7, while sections S21, S22, and S24 do not overlap with the magnetic body 7. That is, section S21 constitutes a protrusion (third protrusion) protruding from the outer peripheral end 51 of the magnetic body 7 to the +y direction, section S22 constitutes a protrusion (second protrusion) protruding from the outer peripheral end 52 of the magnetic body 7 to the +x direction, and section S24 constitutes a protrusion protruding from the outer peripheral end 54 of the magnetic body 7 to the -y direction. Thus, the sections S21 and S24 of the second coil pattern CP2 constitute protrusions that do not overlap the magnetic body 7 in the z direction, thereby suppressing the spread of magnetic flux in the ±y directions and correspondingly spreading the magnetic flux in the +x direction.

[0062] The third coil pattern CP3 has sections S31 to S34. Section S31 is located in the +y direction (12 o'clock direction) and extends in the x direction. Section S32 is located in the +x direction (3 o'clock direction) and extends in the y direction. Section S33 is located in the -x direction (9 o'clock direction) and extends in the y direction. Section S34 is located in the -y direction (6 o'clock direction) and extends in the x direction. Here, most of section S32 overlaps with the magnetic body 7, while sections S31, S33, and S34 do not overlap with the magnetic body 7. That is, section S31 constitutes a protrusion (fifth protrusion) protruding from the outer peripheral end 51 of the magnetic body 7 in the +y direction, section S33 constitutes a protrusion (fourth protrusion) protruding from the outer peripheral end 53 of the magnetic body 7 in the -x direction, and section S34 constitutes a protrusion protruding from the outer peripheral end 54 of the magnetic body 7 in the -y direction. Thus, the sections S31 and S34 of the third coil pattern CP3 constitute protrusions that do not overlap the magnetic body 7 in the z direction, thereby suppressing the expansion of the magnetic flux in the ±y directions and expanding the magnetic flux in the −x direction by a corresponding amount.

[0063] Fig. 9 It is a schematic diagram for explaining the change of magnetic flux due to the position of the outer peripheral end 52 of the magnetic body 7.

[0064] Fig. 9 (a) shows a case where the position X1 in the x direction of the outer peripheral end 52 of the magnetic body 7 overlaps with the opening area of ​​the second coil pattern CP2. In this case, the magnetic flux generated by the first coil pattern CP1 The magnetic flux generated by the second coil pattern CP2 The communication area is expanded in the +x direction by reinforcing each other. In particular, if the position X1 of the outer peripheral end 52 of the magnetic body 7 in the x direction is closer to the +x direction than the central position X2 of the second coil pattern CP2 in the x direction, that is, the distance between the position X1 and the interval S22 of the second coil pattern CP2 is less than 1 / 2 of the opening width of the second coil pattern CP2 in the x direction, the communication area is expanded in the +x direction. Here, the magnetic flux generated by the first coil pattern CP1 is composed of the magnetic flux The components that constitute the magnetic flux but in Fig. 9 In the example shown in (a), the magnetic flux generated by the first coil pattern CP1 is composed of the magnetic flux The composition is relatively small.

[0065] In contrast, Fig. 9 As shown in (b), when the section S22 of the second coil pattern CP2 does not protrude from the magnetic body 7 in the +x direction, the magnetic flux The weight of the composition increases, so Fig. 9 Compared with the case shown in (a), the expansion of the communicable area in the +x direction is suppressed. Fig. 9 As shown in (c), when the position X1 in the x direction of the outer peripheral end 52 of the magnetic body 7 is further in the -x direction than the central position X2 in the x direction of the second coil pattern CP2, that is, when the distance between the position X1 and the interval S22 of the second coil pattern CP2 is more than 1 / 2 of the opening width in the x direction of the second coil pattern CP2, the magnetic flux The weight of the composition increases, so Fig. 9 Compared with the case shown in (a), the expansion of the communication area in the +x direction is suppressed. Considering these points, it is preferable that the position X1 of the outer peripheral end 52 of the magnetic body 7 in the x direction and the positional relationship of the second coil pattern CP2 are Fig. 9 Although not shown in the figure, the positional relationship between the position of the outer peripheral end 53 of the magnetic body 7 in the x direction and the third coil pattern CP3 is also the same.

[0066] Thus, in this embodiment, since the first to third coil patterns CP1 to CP3 have the above-mentioned positional relationship with the magnetic body 7, the magnetic flux interlinked with the first to third coil patterns CP1 to CP3 expands in the ±x direction. As a result, no matter where the smartphone 3 is placed on the placement surface 2 of the terminal holder 1, communication with the smartphone 3 can be performed correctly.

[0067] Fig.10 It is a schematic plan view for explaining the structure of a coil component 100 a according to a modified example.

[0068] Fig.10 The first coil pattern CP1 of the coil component 100a shown is arranged along the outer shape of the fourth coil pattern CP4, and a part of the second and third coil patterns CP2 and CP3 are arranged along a part of the first coil pattern CP1, which is different from the above-mentioned coil component 100. More specifically, the sections S12 and S13 of the first coil pattern CP1 have a shape including a portion whose coordinates in the x direction change along the circumferential direction, and accordingly, the section S23 of the second coil pattern CP2 arranged along the section S12 of the first coil pattern CP1 and the section S32 of the third coil pattern CP3 arranged along the section S13 of the first coil pattern CP1 also have a shape including a portion whose coordinates in the x direction change along the circumferential direction. Fig.10 The coil component 100a shown may be such that the first coil pattern CP1 partially overlaps the second and third coil patterns CP2 and CP3 in the y direction as shown in the example. Thus, since a portion of the intervals S23 and S32 of the second and third coil patterns CP2 and CP3 has a portion extending toward the central side in the x direction, the antenna characteristics of the substantially central portion in the x direction are improved.

[0069] Fig.11 1 is a block diagram of a wireless power transmission device 60 using the coil component 100 according to the present embodiment.

[0070] Fig.11 The wireless power transmission device 60 shown includes: a coil component 100 having first to fourth coil patterns CP1 to CP4, a communication circuit 61 connected to the first to third coil patterns CP1 to CP3, and a power transmission circuit 62 connected to the fourth coil pattern CP4. The communication circuit 61 and the power transmission circuit 62 are connected to a control circuit 63. Thus, data transmitted and received via a communication line 64 can be communicated with the smartphone 3 via the first to third coil patterns CP1 to CP3 for NFC, and the power supplied by the power supply 65 can be wirelessly transmitted to the smartphone 3 via the fourth coil pattern CP4 for wireless power transmission.

[0071] In this way, according to the present embodiment, it is possible to provide the coil component 100 which is applicable to the terminal holder 1 capable of communication through NFC and charging through wireless power transmission.

[0072] As mentioned above, although the preferred embodiment of the present disclosure has been described, the present disclosure is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the gist of the present disclosure, and these modifications are naturally included in the scope of the present disclosure.

[0073] The technology involved in the present disclosure includes the following configuration examples, but is not limited thereto.

[0074] A coil component of one embodiment of the present disclosure comprises: a first coil pattern; a second coil pattern connected to the first coil pattern; and a magnetic body covering the first and second coil patterns from the axial direction, the first and second coil patterns are arranged side by side in a first direction orthogonal to the axial direction, and the first coil pattern has: a first protrusion protruding from the first outer peripheral end of the magnetic body in a second direction orthogonal to the axial direction and the first direction toward the second direction.

[0075] In this coil component, it is possible to suppress the spread of the magnetic flux in the second direction and to expand the magnetic flux in the first direction by an amount corresponding thereto, thereby efficiently expanding the communicable area.

[0076] Alternatively, the second coil pattern may include a second protrusion that protrudes from a second outer peripheral end of the magnetic body on one side in the first direction toward the first direction. Thus, on the outside of the second coil pattern, the magnetic flux generated by the first coil pattern and the magnetic flux generated by the second coil pattern are suppressed from weakening each other.

[0077] Furthermore, the distance between the second protrusion and the second outer peripheral end of the magnetic body in the first direction may be smaller than 1 / 2 of the opening width of the second coil pattern in the first direction. Thus, the expansion of the communication area in the first direction is increased.

[0078] Furthermore, the second coil pattern may include a third protrusion that protrudes from one outer peripheral end of the magnetic body in the second direction. Thus, the spread of the magnetic flux in the second direction is suppressed, and the magnetic flux is sufficiently spread in the first direction by a corresponding amount.

[0079] In addition, the first and second coil patterns may partially overlap in the second direction. In this case, the first section of the first coil pattern overlapping the magnetic body may have a shape including a portion whose coordinates in the first direction change along the circumferential direction, and the second section of the second coil pattern may be arranged along the first section. Thus, the antenna characteristics of the substantially central portion in the first direction can be improved.

[0080] In addition, the coil component may further include a third coil pattern connected to the first coil pattern, and the first coil pattern may be arranged between the second coil pattern and the third coil pattern. Thus, the communicable area is expanded in the first direction.

[0081] Alternatively, the third coil pattern may include a fourth protrusion that protrudes from the third outer peripheral end on the other side in the first direction of the magnetic body toward the first direction. Thus, on the outside of the third coil pattern, the magnetic flux generated by the first coil pattern and the magnetic flux generated by the third coil pattern are suppressed from weakening each other.

[0082] Furthermore, the distance between the fourth protrusion and the third outer peripheral end of the magnetic body in the first direction may be smaller than 1 / 2 of the opening width of the third coil pattern in the first direction. Thus, the expansion of the communication area in the first direction is increased.

[0083] Furthermore, the third coil pattern may include a fifth protrusion that protrudes from one outer peripheral end of the magnetic body toward the second direction. Thus, the expansion of the magnetic flux toward the second direction is suppressed, and the magnetic flux is sufficiently expanded toward the first direction by a corresponding amount.

[0084] In addition, the first and third coil patterns may partially overlap in the second direction. In this case, the third section of the first coil pattern overlapping the magnetic body may have a shape including a portion whose coordinates in the first direction change along the circumferential direction, and the fourth section of the third coil pattern may be arranged along the third section. Thus, the antenna characteristics of the substantially central portion in the first direction can be improved.

[0085] Alternatively, the first to third coil patterns may be connected so that the magnetic field generated by the first coil pattern and the magnetic fields generated by the second and third coil patterns are in opposite phases to each other. Thus, the magnetic field generated by the first coil pattern and the magnetic field generated by the second and third coil patterns mainly reinforce each other.

[0086] In addition, the number of turns of each of the second and third coil patterns may be greater than the number of turns of the first coil pattern. Thereby, the antenna characteristics on both sides in the first direction can be improved.

[0087] In addition, the coil component may also include: a fourth coil pattern, which is arranged in the opening area of ​​the first coil pattern and has the same axial direction as the first coil pattern. In this case, the coil component may also include a substrate, and the first, second and fourth coil patterns are arranged on at least one surface of the substrate. Thus, the first, second and fourth coil patterns can be formed on the surface of the substrate, reducing the number of components. In addition, since the first, second and fourth coil patterns can be formed at the same time, the manufacturing process can also be simplified.

[0088] Furthermore, a wireless power transmission device according to an embodiment of the present disclosure includes the above-mentioned coil component, a communication circuit connected to the first and second coil patterns, and a power transmission circuit connected to the fourth coil pattern.

[0089] In this wireless power transmission device, it is possible to provide a wireless power transmission device that can efficiently expand a communicable area.

Claims

1. A coil component, characterized in that: have: 1st coil pattern; a second coil pattern connected to the first coil pattern; a third coil pattern connected to the first coil pattern; a fourth coil pattern, which is arranged in the opening area of ​​the first coil pattern and has the same axial direction as the first coil pattern; as well as a magnetic body which covers the first, second, third and fourth coil patterns from the axial direction, The first coil pattern is arranged so as to be sandwiched by the second coil pattern and the third coil pattern from a first direction. The conductor patterns constituting the first, second and third coils are wound in the order of the first coil pattern, the second coil pattern, the first coil pattern, the third coil pattern and the first coil pattern. The width of the magnetic body in a second direction orthogonal to the axial direction and the first direction is smaller than the opening width of each of the conductor patterns of the first, second and third coils in the second direction, so that the first, second and third coil patterns respectively have: a first, a third and a fifth protrusion extending in the first direction and protruding from a first outer peripheral end of the magnetic body in the second direction toward the second direction, The second coil has a second protrusion that protrudes toward the first direction from a second outer peripheral end of the magnetic body on one side in the first direction. The entirety of the fourth coil pattern overlaps with the magnetic body, A first connection portion connecting the first coil pattern and the second coil pattern, and a second connection portion connecting the first coil pattern and the third coil pattern are located outside the fourth coil pattern.

2. The coil component according to claim 1, characterized in that: A distance between the second protrusion and the second outer peripheral end of the magnetic body in the first direction is smaller than 1 / 2 of an opening width of the second coil pattern in the first direction.

3. The coil component according to claim 1, characterized in that: The opening region of the first coil pattern and the opening region of the second coil pattern partially overlap in the second direction.

4. The coil component according to claim 3, characterized in that: The first section of the first coil pattern overlapping the magnetic body has a shape including a portion whose coordinates in the first direction change along a circumferential direction. The second section of the second coil pattern is arranged along the first section.

5. The coil component according to claim 1, characterized in that: The third coil pattern includes a fourth protrusion that protrudes toward the first direction from a third outer peripheral end of the magnetic body on the other side in the first direction.

6. The coil component according to claim 5, characterized in that: A distance between the fourth protrusion and the third outer peripheral end of the magnetic body in the first direction is smaller than 1 / 2 of an opening width of the third coil pattern in the first direction.

7. The coil component according to claim 1, characterized in that: The opening region of the first coil pattern and the opening region of the third coil pattern partially overlap in the second direction.

8. The coil component according to claim 7, characterized in that: The third section of the first coil pattern overlapping the magnetic body has a shape including a portion whose coordinates in the first direction change along a circumferential direction. The fourth section of the third coil pattern is arranged along the third section.

9. The coil component according to claim 1, characterized in that: The first to third coil patterns are connected so that the magnetic field generated by the first coil pattern and the magnetic fields generated by the second and third coil patterns are in opposite phases to each other.

10. The coil component according to claim 1, characterized in that: The number of turns of each of the second and third coil patterns is greater than the number of turns of the first coil pattern.

11. The coil component according to any one of claims 1 to 10, characterized in that: Also has: base material, The first, second, third and fourth coil patterns are provided on at least one surface of the substrate.

12. A wireless power transmission device, characterized in that: have: The coil component according to any one of claims 1 to 11; a communication circuit connected to the first, second and third coil patterns; and A power transmission circuit is connected to the fourth coil pattern.

Images