Coil component and wireless communication device having the same

Abstract

In a coil component having two coil patterns with different functions formed coaxially, the outer diameters of the two coil patterns are sufficiently ensured. The coil component disclosed in this specification includes first and second coil patterns 100 and 200 formed coaxially and electrically separated from each other. The first coil pattern 100 has a plurality of turns including turns 110 and 120, and the turn 210 of the second coil pattern 200 is arranged between the turns 110 and 120 of the first coil pattern 100. Thus, the outer diameter of the second coil pattern 200 can be made larger than the inner diameter of the first coil pattern 100.

Description

Technical Field

[0001] The present invention relates to a coil component and a wireless communication device having the same, and more particularly to a coil component in which two coil patterns having different functions are coaxially formed, and a wireless communication device having the same. Background Art

[0002] The coil components described in the known patent documents 1 and 2 are coil components in which two coil patterns having different functions are coaxially formed. The coil components described in the known patent documents 1 and 2 have a structure in which a coil pattern for near field wireless communication (NFC) and a coil pattern for wireless power transmission are coaxially formed on a substrate.

[0003] Prior art literature:

[0004] Patent Document 1: Japanese Patent Application Publication No. 2018-060979

[0005] Patent Document 2: Japanese Patent Application No. 2015-513276 Summary of the invention

[0006] [Problems to be Solved by the Invention]

[0007] However, in the coil components described in Patent Documents 1 and 2, the coil pattern for wireless power transmission is arranged in the inner diameter portion of the coil pattern for NFC, so the outer diameter of the coil pattern for wireless power transmission is limited to be smaller than the inner diameter size of the coil pattern for NFC. Therefore, there is a problem that the characteristics of the coil pattern for wireless power transmission cannot be fully improved. Such a problem is not limited to the case where the coil pattern for NFC and the coil pattern for wireless power transmission are coaxially arranged, and this is a problem that occurs widely when two coil patterns with different functions are coaxially formed on a substrate.

[0008] Therefore, an object of the present invention is to provide a wireless communication device having such a coil component, in which two coil patterns having different functions are coaxially formed, to sufficiently ensure the outer diameters of the two coil patterns.

[0009] [Methods of solving the problem]

[0010] The coil component of the present invention is characterized in that it has a substrate, and a first coil pattern and a second coil pattern coaxially formed on a surface of the substrate and electrically separated from each other, the first coil pattern having a plurality of turns including a first turn and a second turn, and a specified turn of the second coil pattern is arranged between the first turn and the second turn of the first coil pattern.

[0011] According to the present invention, the outer diameter of the second coil pattern can be made larger than the inner diameter of the first coil pattern.

[0012] In the present invention, the number of turns of the first coil pattern and the second coil pattern may be different from each other. Thus, the coil characteristics of the first coil pattern and the second coil pattern may be optimized respectively. In this case, the number of turns in the second coil pattern may be greater than the number of turns in the first coil pattern. Thus, the inductance of the second coil pattern may be increased.

[0013] In the present invention, the first turn is the outermost turn of the first coil pattern, the second turn is the second turn starting from the outermost circumference of the first coil pattern, and the predetermined turn may be the outermost turn of the second coil pattern. Thus, the outer diameter of the second coil pattern can be made substantially the same as the outer diameter of the first coil pattern.

[0014] In the present invention, the pattern width of a predetermined turn of the second coil pattern may be greater than the pattern width of the first turn of the first coil pattern. Thus, the difference between the outer diameter of the second coil pattern and the outer diameter of the first coil pattern can be reduced.

[0015] In the present invention, each turn constituting the second coil pattern can be divided into a plurality of lines in the radial direction by a spiral gap. Thus, the density distribution of the current flowing through the second coil pattern is uniform, so that the DC resistance and the AC resistance can be reduced. In this case, the plurality of lines include a first line located on the innermost peripheral side, a second line located on the outermost peripheral side, and a third line located between the first line and the second line, and the pattern width of the first and second lines can be smaller than the pattern width of the third line. Thus, the heat generated by eddy currents can be reduced. Further in this case, the pattern width of the first line can be smaller than the pattern width of the second line. Thus, the heat generated by eddy currents can be further reduced.

[0016] In the present invention, each turn constituting the first coil pattern can be divided into a plurality of lines in the radial direction by a spiral slit, thereby making the density distribution of the current flowing through the first coil pattern uniform, thereby reducing the DC resistance and the AC resistance.

[0017] The coil component of the present invention also has a third and fourth coil pattern coaxially formed on the other surface of the substrate and electrically separated from each other, and the inner peripheral end of the third coil pattern can be connected to the inner peripheral end of the first coil pattern, and the inner peripheral end of the fourth coil pattern can be connected to the inner peripheral end of the second coil pattern. Thus, while the number of turns of the two coils is increased, there is no need for a connection pattern for leading the inner peripheral end of each coil pattern to the outside.

[0018] In this case, the first coil pattern and the third coil pattern may have the same pattern shape as each other, and the second coil pattern and the fourth coil pattern may have the same pattern shape as each other. Thus, the coil patterns can be formed on the front and back sides of the substrate using the same mask pattern.

[0019] The wireless communication device of the present invention is characterized by comprising the above-mentioned coil component, a wireless communication circuit connected to one of the first and second coil patterns, and a wireless power transmission circuit connected to the other of the first and second coil patterns.

[0020] According to the present invention, it is possible to realize both wireless communication characteristics and a wireless power transmission circuit without increasing the planar size of the substrate.

[0021] Effects of the Invention

[0022] Thus, according to the present invention, in a coil component in which two coil patterns having different functions are coaxially formed, the outer diameters of the two coil patterns can be sufficiently ensured. In addition, according to the present invention, a wireless communication device having such a coil component can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic cross-sectional view showing the structure of a coil component according to one embodiment of the present invention.

[0024] Figure 2 1 is a plan view for explaining the pattern shapes of the first and second coil patterns 100 and 200 .

[0025] Figure 3 is an equivalent circuit diagram of the first and second coil patterns 100 , 200 .

[0026] Figure 4 It is a plan view for explaining the pattern shapes of the third and fourth coil patterns 300 and 400 .

[0027] Figure 5 2 is an equivalent circuit diagram of the third and fourth coil patterns 300 and 400 .

[0028] Figure 6 1 is a transmissive plan view showing a state in which the first and second coil patterns 100 , 200 overlap with the third and fourth coil patterns 300 , 400 .

[0029] Figure 7 This is an equivalent circuit diagram of a coil component according to one embodiment of the present invention.

[0030] Figure 8 This is a block diagram for explaining the structure of a wireless communication device including a coil component according to one embodiment of the present invention.

[0031] Fig. 9 This is a block diagram for explaining the structure of a wireless communication device including a coil component according to a modified example.

[0032] Fig.10 2 is a schematic cross-sectional view showing an example in which the pattern widths of the second and fourth coil patterns 200 , 400 are changed according to radial positions.

[0033] Fig.11 It is a plan view for explaining the pattern shapes of the first and second coil patterns 100 and 200 according to the modification.

[0034] Fig.12 It is a plan view for explaining the pattern shapes of the third and fourth coil patterns 300 and 400 according to the modification.

[0035] Fig.13 It is an equivalent circuit diagram of a coil component according to a modified example.

[0036] Description of Reference Numerals

[0037] 10 substrate

[0038] 11 One surface of the substrate

[0039] 12 The other surface of the substrate

[0040] 21 NFC antenna

[0041] 22 Wireless power receiving coil

[0042] 31 NFC circuit

[0043] 32 Battery control circuit

[0044] 33 Batteries

[0045] 34 CPU

[0046] 35 Memory

[0047] 36 I / O devices

[0048] 100 First coil pattern

[0049] 200 Second coil pattern

[0050] 300 Third coil pattern

[0051] 400 Fourth coil pattern

[0052] 101, 201, 301, 401 outer end

[0053] 102~104, 202~204, 302~304, 402~404 inner peripheral end

[0054] 110, 120, 210-260, 310, 320, 410-460 turns

[0055] 111, 112, 121, 122, 211-213, 221-223, 231-233, 241-243, 251-253, 261-263, 311, 312, 321, 322, 411-413, 421-423, 431-433, 441-443, 451-453, 461-463 Wire

[0056] 501~506 Connection

[0057] A1, A2, A3, B1, B2, B3, a1, a2, b1, b2 split pattern

[0058] C1, C2 center point

[0059] L1, L2 virtual lines

[0060] W1~W4 Pattern width DETAILED DESCRIPTION

[0061] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0062] Figure 1 This is a schematic cross-sectional view showing the structure of a coil component according to one embodiment of the present invention.

[0063] like Figure 1 As shown, the coil component of the present embodiment has a substrate 10, first and second coil patterns 100, 200 formed on one surface 11 of the substrate 10, and third and fourth coil patterns 300, 400 formed on the other surface 12 of the substrate 10. The details will be described below. The inner peripheral end of the first coil pattern 100 and the inner peripheral end of the third coil pattern 300 are connected to each other via a connecting portion 501 provided through the substrate 10, and the inner peripheral end of the second coil pattern 200 and the inner peripheral end of the fourth coil pattern 400 are connected to each other via a plurality of connecting portions 502 to 504 (in the middle) provided through the substrate 10. Figure 1 The cross section shown only shows that the connecting parts 503 are connected to each other.

[0064] The material of the substrate 10 is not particularly limited, and a transparent or translucent flexible insulating material such as PET resin can be used. Alternatively, the substrate 10 may be a flexible substrate of glass cloth impregnated with epoxy resin.

[0065] Figure 21 is a plan view for explaining the pattern shapes of the first and second coil patterns 100 and 200 , and shows a state viewed from the side of one surface 11 of the substrate 10 .

[0066] like Figure 2 As shown, the first coil pattern 100 is composed of a turn 110 located at the outermost circumference and a turn 120 located at the second circumference starting from the outermost circumference. That is, the first coil pattern 100 has a two-turn structure. The outer peripheral end 101 of the first coil pattern 100 is led out in the radial direction in a manner that the pattern width is expanded. In addition, the inner peripheral end 102 of the first coil pattern 100 is connected to the connecting portion 501.

[0067] The second coil pattern 200 has a six-turn structure consisting of turns 210 to 260, wherein turn 210 is located at the outermost circumference and turn 260 is located at the innermost circumference. Among them, the turn 210 located at the outermost circumference is arranged between the turn 110 and the turn 120 of the first coil pattern 100. The other turns 220 to 260 are arranged in the inner diameter area surrounded by the first coil pattern 100. In this way, the first coil pattern 100 and the second coil pattern 200 are composed of a spiral planar conductor wound coaxially. The first coil pattern 100 and the second coil pattern 200 are not connected to each other and are electrically separated. Here, "coaxial" not only includes the situation where the center points of the two coil patterns are completely consistent, but also includes the situation where the center point of one coil pattern overlaps with the inner diameter area of ​​another coil pattern.

[0068] In addition, each turn 210 to 260 is divided into three by two spiral slits in the radial direction. That is, turn 210 is divided into three lines 211 to 213, turn 220 is divided into three lines 221 to 223, turn 230 is divided into three lines 231 to 233, turn 240 is divided into three lines 241 to 243, turn 250 is divided into three lines 251 to 253, and turn 260 is divided into three lines 261 to 263. Here, lines 211, 221, 231, 241, 251, 261 are located on the outer circumference side of lines 212, 222, 232, 242, 252, 262, respectively, and lines 213, 223, 233, 243, 253, 263 are located on the inner circumference side of lines 212, 222, 232, 242, 252, 262, respectively. Thus, each turn 210 to 260 constituting the second coil pattern 200 is divided into three in the radial direction, so the pattern width of each turn is greater than the pattern width of each turn of the first coil pattern 100. Here, the so-called "pattern width" refers to the width of the planar conductor in the radial direction, and when each turn is divided into a plurality of lines as in the second coil pattern 200, it is defined as the total width of the plurality of lines.

[0069] The outer peripheral end 201 of the second coil pattern 200 is led out in the radial direction in a manner that the pattern width is expanded. In addition, the second coil pattern 200 has three inner peripheral ends. That is, there is an inner peripheral end 202 as the end of the line 261, an inner peripheral end 203 as the end of the line 262, and an inner peripheral end 204 as the end of the line 263. These inner peripheral ends 202 to 204 are respectively connected to the connecting parts 502 to 504.

[0070] Therefore, if Figure 3 As shown, the lines 211, 221, 231, 241, 251, 261 located on the outermost side constitute a segmentation pattern A1 connected in series between the outer peripheral end 201 and the inner peripheral end 202, the lines 212, 222, 232, 242, 252, 262 located in the center constitute a segmentation pattern A2 connected in series between the outer peripheral end 201 and the inner peripheral end 203, and the lines 213, 223, 233, 243, 253, 263 located on the innermost side constitute a segmentation pattern A3 connected in series between the outer peripheral end 201 and the inner peripheral end 204. In addition, Figure 3 The first coil pattern 100 is shown, and the turn 210 of the second coil pattern 200 arranged between the turn 110 and the turn 120 of the first coil pattern 100 is schematically shown.

[0071] like Figure 2 As shown, when a virtual line L1 is drawn radially extending from the center point C1 of the first and second coil patterns 100 and 200, the connecting portions 501 and 503 are both arranged on the virtual line L1. In addition, the connecting portions 502 and 504 are arranged at positions symmetrical to each other with respect to the virtual line L1.

[0072] Figure 4 1 is a plan view for explaining the pattern shapes of the third and fourth coil patterns 300 and 400 , and shows a state viewed from the other surface 12 side of the substrate 10 .

[0073] like Figure 4 As shown, the pattern shapes of the third and fourth coil patterns 300 and 400 are respectively the same as the pattern shapes of the first and second coil patterns 100 and 200. Therefore, the first and second coil patterns 100 and 200 and the third and fourth coil patterns 300 and 400 can be manufactured using the same mask, thereby making it possible to significantly reduce manufacturing costs.

[0074] The third coil pattern 300 is composed of a turn 310 located at the outermost circumference and a turn 320 located at the second circumference starting from the outermost circumference. That is, the third coil pattern 300 has a two-turn structure. The outer peripheral end 301 of the third coil pattern 300 is led out in the radial direction in a manner that the pattern width is expanded. In addition, the inner peripheral end 302 of the third coil pattern 300 is connected to the connecting portion 501.

[0075] The fourth coil pattern 400 is a six-turn structure consisting of turns 410 to 460, with turn 410 located at the outermost circumference and turn 460 located at the innermost circumference. Among them, turn 410 located at the outermost circumference is arranged between turn 310 and turn 320 of the third coil pattern 300. The other turns 420 to 460 are arranged in the inner diameter area surrounded by the third coil pattern 300. In this way, the third coil pattern 300 and the fourth coil pattern 400 are composed of a helical planar conductor wound coaxially. The third coil pattern 300 and the fourth coil pattern 400 are not connected to each other and are electrically separated.

[0076] In addition, each turn 410 to 460 is divided into three in the radial direction by two spiral slits. That is, turn 410 is divided into three lines 411 to 413, turn 420 is divided into three lines 421 to 423, turn 430 is divided into three lines 431 to 433, turn 440 is divided into three lines 441 to 443, turn 450 is divided into three lines 451 to 453, and turn 460 is divided into three lines 461 to 463. Here, lines 411, 421, 431, 441, 451, 461 are located on the outer circumference side of lines 412, 422, 432, 442, 452, 462, respectively, and lines 413, 423, 433, 443, 453, 463 are located on the inner circumference side of lines 421, 422, 432, 442, 452, 462, respectively. As such, since the turns 410 to 460 constituting the fourth coil pattern 400 are divided into three in the radial direction, the pattern width of each turn is greater than the pattern width of each turn of the third coil pattern 300 .

[0077] The outer peripheral end 401 of the fourth coil pattern 400 is led out in the radial direction as the pattern width increases. In addition, the fourth coil pattern 400 has three inner peripheral ends. That is, there is an inner peripheral end 402 as the end of the line 461, an inner peripheral end 403 as the end of the line 462, and an inner peripheral end 404 as the end of the line 463. These inner peripheral ends 402 to 404 are connected to the connecting parts 504, 503, and 502, respectively.

[0078] Therefore, if Figure 5 As shown, the lines 411, 421, 431, 441, 451, 461 located on the outermost side constitute a segmentation pattern B1 connected in series between the outer peripheral end 401 and the inner peripheral end 402, the lines 412, 422, 432, 442, 452, 462 located in the center constitute a segmentation pattern B2 connected in series between the outer peripheral end 401 and the inner peripheral end 403, and the lines 413, 423, 433, 443, 453, 463 located on the innermost side constitute a segmentation pattern B3 connected in series between the outer peripheral end 401 and the inner peripheral end 404. In addition, Figure 5The third coil pattern 300 is shown, and the turn 410 of the fourth coil pattern 400 arranged between the turn 310 and the turn 320 of the third coil pattern 300 is schematically shown.

[0079] like Figure 4 As shown, when a virtual line L2 is drawn radially extending from the center point C2 of the third and fourth coil patterns 300 and 400, the connecting portions 501 and 503 are both arranged on the virtual line L2. In addition, the connecting portion 502 and the connecting portion 504 are arranged at positions symmetrical to each other with respect to the virtual line L2.

[0080] In the first and second coil patterns 100, 200 and the third and fourth coil patterns 300, 400 having such a structure, as shown in FIG. Figure 6 As shown in FIG. 1 , the center points C1 and C2 overlap, and the virtual lines L1 and L2 overlap, and are formed on the front and back surfaces of the substrate 10. Figure 7 As shown, the first coil pattern 100 and the third coil pattern 300 are connected in series via the connection portion 501 to form a spiral coil with a total of 4 turns. In addition, the second coil pattern 200 and the fourth coil pattern 400 are connected in series via the connection portions 502 to 504 to form a spiral coil with a total of 12 turns. Here, the split patterns A1, A2, and A3 are connected to the split patterns B3, B2, and B1, respectively. That is, the split pattern A1 located on the outermost circumference is connected to the split pattern B3 located on the innermost circumference, and the split pattern A3 located on the innermost circumference is connected to the split pattern B1 located on the outermost circumference.

[0081] Figure 8 This is a block diagram for explaining the structure of a wireless communication device including a coil component according to the present embodiment.

[0082] Figure 8 The wireless communication device shown, for example, a portable information terminal such as a smartphone, has an NFC antenna 21 composed of first and third coil patterns 100, 300, and a wireless power receiving coil 22 composed of second and fourth coil patterns 200, 400. The NFC antenna 21 is connected to an NFC circuit 31, and the wireless power receiving coil 22 is connected to a battery control circuit 32. The NFC circuit 31 is a wireless communication circuit for sending and receiving data via the NFC antenna 21. In addition, the battery control circuit 32 is a wireless power transmission circuit for charging the power received via the wireless power receiving coil 22 to the battery 33. The power charged to the battery 33 is supplied to a CPU 34, a memory 35, an I / O device 36, etc. included in the wireless communication device.

[0083] like Figure 8As shown, the connection between the NFC antenna 21 and the NFC circuit 31 is performed via the outer peripheral end 101 of the first coil pattern 100 and the outer peripheral end 301 of the third coil pattern 300. Similarly, the connection between the wireless power receiving coil 22 and the battery control circuit 32 is performed via the outer peripheral end 201 of the second coil pattern 200 and the outer peripheral end 401 of the fourth coil pattern 400. Therefore, a connection pattern or the like for connecting the inner peripheral end of each coil pattern with the NFC circuit 31 or the battery control circuit 32 is not required.

[0084] Or, as in Fig. 9 In the wireless communication device shown in , the second and fourth coil patterns 200 and 400 can be used as the NFC antenna 21, and the first and third coil patterns 100 and 300 can be used as the wireless power receiving coil 22. In this case, the connection between the NFC antenna 21 and the NFC circuit 31 is performed via the outer peripheral end 201 of the second coil pattern 200 and the outer peripheral end 401 of the fourth coil pattern 400, and the connection between the wireless power receiving coil 22 and the battery control circuit 32 is performed via the outer peripheral end 101 of the first coil pattern 100 and the outer peripheral end 301 of the third coil pattern 300.

[0085] As described above, in the coil component of the present embodiment, the turn 210 as the outermost turn of the second coil pattern 200 is arranged between the turns 110 and 120 of the first coil pattern 100, and the turn 410 as the outermost turn of the fourth coil pattern 400 is arranged between the turns 310 and 320 of the third coil pattern 300. Therefore, compared with the case where the second and fourth coil patterns 200 and 400 are arranged in the inner diameter region of the first and third coil patterns 100 and 300, respectively, the outer diameter dimensions of the second and fourth coil patterns 200 and 400 can be further increased. As a result, the inductance of the second and fourth coil patterns 200 and 400 can be further increased. Moreover, the outermost turns (210, 410) of the second and fourth coil patterns 200, 400 having a large pattern width are arranged on the inner side of the outermost turns (110, 310) of the first and third coil patterns 100, 300 having a small pattern width, so that the outer diameter size of the first and third coil patterns 100, 300 can be maximized, and by arranging the second and fourth coil patterns 200, 400 inside the first and third coil patterns 100, 300, the outer diameter size can be reduced to a minimum.

[0086] Moreover, in the coil component of the present embodiment, since each turn of the second and fourth coil patterns 200 and 400 is divided into three parts in the radial direction by a spiral gap, the deviation of the current density is reduced compared with the case where such a gap is not provided. As a result, the second and fourth coil patterns 200 and 400 constitute, for example, a wireless power receiving coil 22, so that even when the current amount is large, the DC resistance and AC resistance can be reduced. Furthermore, the split pattern A1 located on the outer peripheral side of the second coil pattern 200 is connected to the split pattern B3 located on the inner peripheral side of the fourth coil pattern 400, and the split pattern A3 located on the inner peripheral side of the second coil pattern 200 is connected to the split pattern B1 located on the outer peripheral side of the fourth coil pattern 400, and the difference between the inner periphery and the outer periphery is offset. As a result, the DC resistance and AC resistance can be further reduced.

[0087] In addition, the pattern widths of the second and fourth coil patterns 200 and 400 do not need to be constant, and the pattern widths may be designed to be narrower on the inner and outer circumference sides and wider on the center side.

[0088] For example, in Fig.10 In the example shown, the pattern width of the wire 263, 463 constituting the innermost turn is W1, the pattern width of the wire 211, 411 constituting the outermost turn is W2, and the pattern width of the wire 233, 433 (or 241, 441) constituting the middle turn as a whole from the innermost turn or the outermost turn is W3. When the pattern width of the wire 223, 423 at the center position of the line length of the coil pattern along the wire is W4, W1 is satisfied. <W2<W3<W4

[0089] The pattern widths W1 and W2 of the innermost and outermost turns are reduced because the magnetic field in this part is very strong, and the heat caused by the eddy current will produce a large loss. That is, by reducing the pattern widths W1 and W2 of the innermost and outermost turns, the magnetic flux that interferes with the innermost and outermost turns can be reduced, thereby reducing the generated eddy current. The pattern width W1 of the innermost turn is preferably greater than the pattern thickness of the second and fourth coil patterns 200 and 400. As a result, the eddy current flowing through the second and fourth coil patterns 200 and 400 is concentrated on both sides of the radial direction of the conductor pattern, and the loss reduction effect caused by the narrowing of the pattern width of the second and fourth coil patterns 200 and 400 can be significantly achieved.

[0090] In addition, Fig.10In the example shown, the pattern width W1 of the innermost turn is the smallest, and the pattern width gradually or stagedly increases from the innermost turn toward the center of the line length, and the pattern width W4 at the center of the line length is the largest. Then, the pattern width gradually or stagedly decreases from the center of the line length toward the outermost turn, and the pattern width at the outermost turn becomes W2. The pattern width W1 of the innermost turn is smaller than the pattern width W2 of the outermost turn because the magnetic field of the innermost turn is stronger than that of the outermost turn. In addition, the pattern width W4 at the center of the line length is set to the largest because the magnetic field at the center of the line length is weaker than the magnetic field of the middle turn.

[0091] Furthermore, the pattern thickness of the conductor pattern may be thinner at the innermost circumference than at the outermost circumference. In particular, preferably, the pattern thickness gradually or stage-by-stage becomes thinner from the outermost circumference to the innermost circumference. Thus, on the inner circumference side which is more affected by the eddy current, the loss reduction effect brought by the pattern width is significant.

[0092] Regarding the pattern width of the first and third coil patterns 100 and 300, when used as the NFC antenna 21, since a large current does not flow like the wireless power receiving coil 22, the pattern width can be kept fixed at W1. That is, the pattern width of the first and third coil patterns 100 and 300 can be the same as the pattern width of the innermost circumference of the second and fourth coil patterns 200 and 400.

[0093] Furthermore, if Fig.11 and Fig.12 As shown, the turns 110, 120, 310, 320 constituting the first and third coil patterns 100, 300 may be divided radially by spiral slits. Fig.11 and 12 In the example shown, the turn 110 is divided into two lines 111 and 112, the turn 120 is divided into two lines 121 and 122, the turn 310 is divided into two lines 311 and 312, and the turn 320 is divided into two lines 321 and 322. In this way, if the turns of the first and third coil patterns 100 and 300 are divided in the radial direction by the spiral slits, the first and third coil patterns 100 and 300 can also reduce the bias of the current density.

[0094] In this case, the inner peripheral end of the first coil pattern 100 is composed of the inner peripheral end 103 as the end of the line 121 and the inner peripheral end 104 as the end of the line 122. Similarly, the inner peripheral end of the third coil pattern 300 is composed of the inner peripheral end 303 as the end of the line 321 and the inner peripheral end 304 as the end of the line 322. Then, the inner peripheral ends 103 and 304 are connected to each other via the connection portion 505 provided through the substrate 10, and the inner peripheral ends 104 and 303 are connected to each other via the connection portion 506 provided through the substrate 10.

[0095] Therefore, if Fig.13 As shown, the dividing pattern a1 composed of the lines 111 and 121 located on the outer circumference side of the first coil pattern 100 is connected to the dividing pattern b2 composed of the lines 312 and 322 located on the inner circumference side of the third coil pattern 300 via the connecting portion 505. On the other hand, the dividing pattern a2 composed of the lines 112 and 122 located on the inner circumference side of the first coil pattern 100 is connected to the dividing pattern b1 composed of the lines 311 and 321 located on the outer circumference side of the third coil pattern 300 via the connecting portion 506. Thus, the difference between the inner circumference and the outer circumference of the first and third coil patterns 100 and 300 is offset, thereby reducing the DC resistance and the AC resistance.

[0096] Preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention, and such modifications are also included in the scope of the present invention.

[0097] For example, in the above-mentioned embodiment, each turn of the second and fourth coil patterns 200 and 400 is divided into three by the spiral slit, but such division is not essential in the present invention. In addition, when division is performed, the number of divisions is not limited to three.

Claims

1. A coil component, characterized in that: have: substrate; and a first coil pattern and a second coil pattern coaxially formed on one surface of the substrate and electrically separated from each other, The first coil pattern has a plurality of turns including a first turn and a second turn, A predetermined turn of the second coil pattern is arranged between the first turn and the second turn of the first coil pattern, The first turn is an outermost turn of the first coil pattern, The second turn is the second turn starting from the outermost circumference of the first coil pattern, The predetermined turn is the outermost turn of the second coil pattern, The pattern width of the predetermined turn of the second coil pattern is greater than the pattern width of the first turn of the first coil pattern. Each turn constituting the second coil pattern is divided into a plurality of lines in the radial direction by a spiral gap. The plurality of lines include a first line located at the innermost peripheral side, a second line located at the outermost peripheral side, and a third line located between the first line and the second line, The pattern widths of the first and second lines are smaller than the pattern width of the third line.

2. The coil component according to claim 1, characterized in that The first coil pattern and the second coil pattern have different numbers of turns.

3. The coil component according to claim 2, characterized in that The number of turns of the second coil pattern is greater than the number of turns of the first coil pattern.

4. The coil component according to claim 1, characterized in that A pattern width of the first line is smaller than a pattern width of the second line.

5. The coil component according to claim 1, characterized in that Each turn constituting the first coil pattern is divided into a plurality of lines in the radial direction by a spiral slit.

6. The coil component according to any one of claims 1 to 5, characterized in that: and further comprising third and fourth coil patterns coaxially formed on the other surface of the substrate and electrically separated from each other, An inner peripheral end of the third coil pattern is connected to an inner peripheral end of the first coil pattern, and an inner peripheral end of the fourth coil pattern is connected to an inner peripheral end of the second coil pattern.

7. The coil component according to claim 6, characterized in that The first coil pattern and the third coil pattern have the same pattern shape as each other, The second coil pattern and the fourth coil pattern have the same pattern shape as each other.

8. A wireless communication device, characterized in that: have: The coil component according to any one of claims 1 to 7; a wireless communication circuit connected to one of the first coil pattern and the second coil pattern; as well as A wireless power transmission circuit is connected to the other of the first coil pattern and the second coil pattern.

9. The wireless communication device according to claim 8, characterized in that The number of turns of the second coil pattern is greater than the number of turns of the first coil pattern, The wireless communication circuit is connected to the first coil pattern, The wireless power transmission circuit is connected to the second coil pattern.

10. The wireless communication device according to claim 8, characterized in that further comprising a battery connected to the wireless communication circuit and the wireless power transmission circuit, The wireless power transmission circuit is configured to charge the battery using power received through the second coil pattern, The wireless communication circuit is configured to operate with power supplied from the battery.

11. A coil assembly, characterized in that: have: a first coil pattern having a plurality of turns including a first turn and a second turn; and a second coil pattern comprising a plurality of turns; The number of turns of the second coil pattern is greater than the number of turns of the first coil pattern, The second coil pattern is surrounded by the first coil pattern so that the outermost peripheral turn of the second coil pattern is arranged between the first turn and the second turn of the first coil pattern, The inner peripheral end of the first coil pattern is arranged between the outermost peripheral turn of the second coil pattern and the next outermost peripheral turn of the second coil pattern.

12. The coil assembly according to claim 11, characterized in that: Also features: a third coil pattern having a plurality of turns including a third turn and a fourth turn; as well as a fourth coil pattern comprising a plurality of turns; The fourth coil pattern is surrounded by the third coil pattern so that the outermost peripheral turn of the fourth coil pattern is arranged between the third turn and the fourth turn of the third coil pattern, The inner peripheral end of the third coil pattern is connected to the inner peripheral end of the first coil pattern, An inner peripheral end of the fourth coil pattern is connected to an inner peripheral end of the second coil pattern.

13. The coil assembly according to claim 12, characterized in that: It also has a substrate including a first surface and a second surface facing each other, The first and second coil patterns are formed on the first surface of the substrate, The third and fourth coil patterns are formed on the second surface of the substrate.

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