Coil component and non-contact power transmission device having the same

Abstract

The present invention provides a coil component that can easily connect coil patterns formed on different substrates to each other. The coil component (1) includes: a substrate (10, 20); a coil pattern (100A) formed on the substrate (10); a coil pattern (100B) formed on the substrate (20); a terminal electrode (E1A) connected to one end of the coil pattern (100A) and protruding from the substrate (10); and a terminal electrode (E1B) connected to one end of the coil pattern (100B) and protruding from the substrate (20). The substrates (10, 20) are stacked in a manner in which the terminal electrodes (E1A, E1B) overlap and are connected to each other. In this way, the terminal electrodes (E1A, E1B) protrude from the substrates (10, 20), so that a plurality of terminal electrodes can be easily connected. Furthermore, the terminal electrodes protruding from the substrate can also be used as external terminals of the coil component.

Description

Technical Field

[0001] The present invention relates to a coil component, and more particularly to a coil component suitable for use in a non-contact power transmission device and a non-contact power transmission device including the coil component. Background Art

[0002] In recent years, non-contact power transmission devices that wirelessly supply power from a power supply side to a power receiving side without using a power line have gradually been put into practical use. Non-contact power transmission devices are expected to be applied to various products such as transmission equipment for electric vehicles, electric vehicles, home appliances, electronic equipment, wireless communication equipment, toys, industrial equipment, etc. For example, Patent Document 1 discloses the following example: a plurality of substrates having spiral coil patterns are prepared, and these substrates are stacked in a mutually connected manner to form a power supply coil or a power receiving coil for a non-contact power transmission device.

[0003] The coil component described in Patent Document 1 has a structure in which a plurality of coil patterns are connected in parallel. This reduces the resistance value and allows more current to flow.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2018-102124 Summary of the invention

[0007] Problems to be solved by the invention

[0008] However, in the coil component described in Patent Document 1, coil patterns formed on different substrates are connected at positions overlapping the substrates, so there is a problem that the connection between the coil patterns is not necessarily easy.

[0009] Therefore, an object of the present invention is to provide a coil component capable of easily connecting coil patterns formed on different substrates to each other, and a non-contact power transmission device including the same.

[0010] Methods used to solve problems

[0011] The coil component of the present invention is characterized in that it includes: a first and a second substrate; a first coil pattern formed on one surface of the first substrate; a second coil pattern formed on one surface of the second substrate; a first terminal electrode connected to one end of the first coil pattern and protruding from the first substrate; and a second terminal electrode connected to one end of the second coil pattern and protruding from the second substrate, the first and second substrates being stacked in a manner such that the first and second terminal electrodes overlap and are connected to each other.

[0012] According to the present invention, since the terminal electrodes protrude from the substrate, a plurality of terminal electrodes can be easily connected. Furthermore, the terminal electrodes protruding from the substrate can be used as external terminals of the coil component.

[0013] The coil component of the present invention may also include: a third coil pattern formed on the other surface of the first substrate; a fourth coil pattern formed on the other surface of the second substrate; a third terminal electrode connected to one end of the third coil pattern and protruding from the first substrate; and a fourth terminal electrode connected to one end of the fourth coil pattern and protruding from the second substrate, the other end of the first coil pattern and the other end of the third coil pattern are connected to each other, the other end of the second coil pattern and the other end of the fourth coil pattern are connected to each other, and the first and second substrates are stacked in a manner that the third and fourth terminal electrodes overlap and are connected to each other. Thus, the first coil composed of the first and third coil patterns can be easily connected in parallel with the second coil composed of the second and fourth coil patterns.

[0014] The coil component of the present invention may also include: a third and a fourth substrate; a fifth coil pattern formed on one surface of the third substrate; a sixth coil pattern formed on one surface of the fourth substrate; a seventh coil pattern formed on another surface of the third substrate; an eighth coil pattern formed on another surface of the fourth substrate; a fifth terminal electrode connected to one end of the fifth coil pattern and protruding from the third substrate; a sixth terminal electrode connected to one end of the sixth coil pattern and protruding from the fourth substrate; a seventh terminal electrode connected to one end of the seventh coil pattern and protruding from the third substrate; and an eighth terminal electrode connected to one end of the eighth coil pattern and protruding from the fourth substrate, the other end of the fifth coil pattern is connected to the other end of the seventh coil pattern, and the other end of the sixth coil pattern is connected to the other end of the eighth coil pattern, the third and the fourth substrates are stacked in such a manner that the fifth and the sixth terminal electrodes overlap and are connected to each other, and the seventh and the eighth terminal electrodes overlap and are connected to each other, and the first and second substrates are stacked with the third and the fourth substrates in such a manner that a portion of the first to fourth coil patterns overlaps a portion of the fifth to eighth coil patterns. Thus, the planar position of the coil unit formed by the first to fourth coil patterns is different from the planar position of the coil unit formed by the fifth to eighth coil patterns. Therefore, by using these coil units as power supply coils or power receiving coils for a contactless power transmission device, the power supply area or power receiving area can be expanded.

[0015] The coil component of the present invention may also include first and second dummy electrodes protruding from the third substrate, the first dummy electrode overlaps with the first and second terminal electrodes, and the second dummy electrode overlaps with the third and fourth terminal electrodes. Thus, it is easy to connect the first and second electronic electrodes, and it is easy to connect the third and fourth electronic electrodes.

[0016] The coil component of the present invention may also include third and fourth dummy electrodes protruding from the fourth substrate, the third dummy electrode overlaps the first and second terminal electrodes and the first dummy electrode, and the fourth dummy electrode overlaps the third and fourth terminal electrodes and the second dummy electrode. Thus, it is easier to connect the first and second terminal electrodes, and it is easier to connect the third and fourth terminal electrodes.

[0017] The coil component of the present invention may also include: fifth and seventh dummy electrodes protruding from the first substrate; and sixth and eighth dummy electrodes protruding from the second substrate, the fifth and sixth dummy electrodes overlap with the fifth and sixth terminal electrodes, and the seventh and eighth dummy electrodes overlap with the seventh and eighth terminal electrodes. Thus, the fifth and sixth terminal electrodes are easily connected, and the seventh and eighth terminal electrodes are easily connected.

[0018] The coil component of the present invention may also include: a first connector pin connected to the first and second terminal electrodes; a second connector pin connected to the third and fourth terminal electrodes; a third connector pin connected to the fifth and sixth terminal electrodes; and a fourth connector pin connected to the seventh and eighth terminal electrodes. Thus, connection with the circuit board is easy.

[0019] The non-contact power transmission device of the present invention is characterized by comprising: the above-mentioned coil component; and a circuit substrate, which is connected to the first to fourth coil patterns through the first and second connector pins, and is connected to the fifth to eighth coil patterns through the third and fourth connector pins. According to the present invention, the connection operation between the circuit substrate and the coil component is easy, so the manufacturing cost can be reduced.

[0020] In the present invention, the circuit board may also have a switch that allows current to flow exclusively to the first to fourth coil patterns and the fifth to eighth coil patterns. Thus, when the coil component of the present invention is used as a power supply coil of a contactless power transmission device, power can be transmitted using the first to fourth or fifth to eighth coil patterns according to the planar position of the power receiving coil.

[0021] Effects of the Invention

[0022] As described above, according to the present invention, it is possible to provide a coil component capable of easily connecting coil patterns formed on different substrates to each other, and a non-contact power transmission device including the same. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic perspective view showing the appearance of a coil component 1 according to a preferred embodiment of the present invention.

[0024] Figure 2 It is a schematic exploded perspective view of the coil component 1 .

[0025] Figure 3 2 is a schematic cross-sectional view of the coil component 1 .

[0026] Figure 4 It is a schematic perspective view for explaining the shapes of the substrate 10 and the coil patterns 100A and 200A formed on the surface thereof.

[0027] Figure 5 It is a schematic perspective view for explaining the shapes of the substrate 40 and the coil patterns 300A, 400A, 500A, and 600A formed on the surface thereof.

[0028] Figure 6 (a) is a schematic cross-sectional view of a portion where a lead pattern is formed, Figure 6 (b) is a schematic cross-sectional view of a portion where a terminal electrode is formed.

[0029] Figure 7 It is the equivalent circuit diagram of the center coil C0.

[0030] Figure 8 (a) is a schematic cross-sectional view of a first modified example of a portion where a lead pattern is formed, Figure 8 (b) is a schematic cross-sectional view of a first modified example of a portion where a terminal electrode is formed.

[0031] Fig. 9 (a) is a schematic cross-sectional view of a second modified example of a portion having a lead-out pattern formed therein, Fig. 9 (b) is a schematic cross-sectional view of a second modified example of a portion where a terminal electrode is formed.

[0032] Fig.10 It is a schematic plan view showing the coil component 1 in a transparent manner.

[0033] Fig.11 1 is a circuit diagram of the coil component 1 and the peripheral circuits connected thereto.

[0034] Fig.12 This is a schematic diagram showing the appearance of a wireless power supply device when the coil component 1 is used as a power supply coil of a contactless power transmission device.

[0035] Fig.13 1 is a schematic diagram showing the structure of a non-contact power transmission device using the coil component 1 .

[0036] Fig.14 This is a schematic diagram for explaining a first method of connecting the coil component 1 and the circuit board 700 .

[0037] Fig.15 This is a schematic diagram for explaining a second method of connecting the coil component 1 and the circuit board 700 .

[0038] Fig.16 This is a schematic diagram for explaining a second method of connecting the coil component 1 and the circuit board 700 .

[0039] Fig.17 This is a schematic diagram for explaining a second method of connecting the coil component 1 and the circuit board 700 . DETAILED DESCRIPTION

[0040] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0041] Figure 1 1 is a schematic perspective view showing the appearance of a coil component 1 according to a preferred embodiment of the present invention. Figure 2 is a schematic exploded perspective view of the coil component 1. Figure 3 2 is a schematic cross-sectional view of the coil component 1 .

[0042] like Figure 1 to Figure 3 As shown, the coil component 1 of this embodiment is composed of a magnetic sheet 2, a center coil C0 arranged in a manner overlapping the magnetic sheet 2, a first side coil C1, and a second side coil C2. The magnetic sheet 2 is a sheet component made of a high permeability material such as ferrite, permalloy, and a composite magnetic material, and acts as a magnetic circuit for a magnetic flux that interlinks the center coil C0 and the side coils C1 and C2. Although not particularly limited, the coil component 1 of this embodiment can be used as a power supply coil of a contactless power transmission device. In this case, the power receiving coil is arranged on the power receiving surface 3 located on the opposite side of the magnetic sheet 2 from the center coil C0 and the side coils C1 and C2.

[0043] The center coil C0 includes coil patterns 100A, 100B, 100C formed on one surfaces 11, 21, 31 of the substrates 10, 20, 30, respectively, and coil patterns 200A, 200B, 200C formed on the other surfaces 12, 22, 32 of the substrates 10, 20, 30, respectively. The first side coil C1 includes coil patterns 300A, 300B, 300C formed on one surfaces 41, 51, 61 of the substrates 40, 50, 60, respectively, and coil patterns 400A, 400B, 400C formed on the other surfaces 42, 52, 62 of the substrates 40, 50, 60, respectively. The second side coil C2 includes coil patterns 500A, 500B, 500C formed on one surface 41, 51, 61 of the substrate 40, 50, 60, and coil patterns 600A, 600B, 600C formed on the other surface 42, 52, 62 of the substrate 40, 50, 60, respectively. The material of the substrate 10, 20, 30, 40, 50, 60 is not particularly limited, and a transparent or translucent film-like flexible material with a thickness of about 10 to 50 μm, such as PET resin, can be used. In addition, the substrate 10, 20, 30, 40, 50, 60 can also be a flexible substrate composed of glass cloth impregnated with epoxy resin.

[0044] In the present embodiment, the number of turns of each coil pattern (100A, 100B, 100C, 200A, 200B, 200C) constituting the center coil C0 is the same as each other, the number of turns of each coil pattern (300A, 300B, 300C, 400A, 400B, 400C) constituting the first side coil C1 is the same as each other, and the number of turns of each coil pattern (500A, 500B, 500C, 600A, 600B, 600C) constituting the second side coil C2 is the same as each other. In addition, the number of turns of each coil pattern constituting the first side coil C1 is the same as the number of turns of each coil pattern constituting the second side coil C2. The number of turns of each coil pattern constituting the center coil C0 may be the same as or different from the number of turns of each coil pattern constituting the first side coil C1 or the second side coil C2. Hereinafter, when the coil patterns 100A, 100B, and 100C do not need to be particularly distinguished or are collectively referred to as the coil patterns 100A, 100B, and 100C, they may be referred to as “the coil pattern 100 .” The same applies to the other coil patterns 200 , 300 , 400 , 500 , and 600 .

[0045] Figure 4 It is a schematic perspective view for explaining the shapes of the substrate 10 and the coil patterns 100A and 200A formed on the surface thereof.

[0046] like Figure 4As shown, the outer peripheral end of the coil pattern 100A is connected to the terminal electrode E1A, and the outer peripheral end of the coil pattern 200A is connected to the terminal electrode E2A. The terminal electrodes E1A and E2A are not formed on the substrate 10, but protrude from the substrate 10. That is, the terminal electrodes E1A and E2A do not overlap with the substrate 10. The terminal electrode E1A is connected to the outer peripheral end of the coil pattern 100A through a lead pattern 111A provided on one surface 11 of the substrate 10 and a lead pattern 112A provided on the other surface 12 of the substrate 10. The lead pattern 111A and the lead pattern 112A are connected to each other through a through-hole conductor provided through the substrate 10. On the other hand, the terminal electrode E2A is connected to the outer peripheral end of the coil pattern 200A through a lead pattern 211A provided on one surface 11 of the substrate 10.

[0047] The terminal electrodes E1A and E2A are extensions of the lead patterns 111A and 211A, respectively, and are made of the same conductive material as the lead patterns 111A and 211A. The terminal electrodes E1A and E2A are formed on the surface of the substrate 10 at the same time as the coil patterns 100A and 200A and the lead patterns 111A, 112A and 211A, and then the portions of the substrate 10 overlapping with the terminal electrodes E1A and E2A are removed by irradiation with a laser beam or the like, thereby protruding from the substrate 10.

[0048] Although not particularly limited, the coil patterns 100A and 200A are both divided into six parts in the radial direction by five spiral slits. For example, the coil pattern 200A is divided into six wires 201A to 206A, and each wire 201A to 206A is spirally wound in multiple turns. The inner peripheral ends of the wires 201A to 206A are connected to the corresponding wires of the coil pattern 100A through the through-hole conductors T11 to T16 provided in the substrate 10. Specifically, the wire 201A located on the outermost peripheral side is connected to the innermost wire constituting the coil pattern 100A through the through-hole conductor T11, and the wire 206A located on the innermost peripheral side is connected to the outermost wire constituting the coil pattern 100A through the through-hole conductor T16.

[0049] The coil patterns 100B, 200B, 100C, and 200C also have the same structure, and therefore, duplicate descriptions are omitted.

[0050] Figure 5 It is a schematic perspective view for explaining the shapes of the substrate 40 and the coil patterns 300A, 400A, 500A, and 600A formed on the surface thereof.

[0051] like Figure 5As shown, the outer peripheral end of the coil pattern 300A is connected to the terminal electrode E3A, and the outer peripheral end of the coil pattern 400A is connected to the terminal electrode E4A. The terminal electrodes E3A and E4A are not formed on the substrate 40, but protrude from the substrate 40. That is, the terminal electrodes E3A and E4A do not overlap with the substrate 40. The terminal electrode E3A is connected to the outer peripheral end of the coil pattern 300A through the lead pattern 311A ​​provided on one surface 41 of the substrate 40 and the lead pattern 312A provided on the other surface 42 of the substrate 40. The lead pattern 311A ​​and the lead pattern 312A are connected to each other through the through-hole conductor provided through the substrate 40. On the other hand, the terminal electrode E4A is connected to the outer peripheral end of the coil pattern 400A through the lead pattern 411A provided on one surface 41 of the substrate 40.

[0052] Similarly, the outer peripheral end of the coil pattern 500A is connected to the terminal electrode E5A, and the outer peripheral end of the coil pattern 600A is connected to the terminal electrode E6A. The terminal electrodes E5A and E6A are not formed on the substrate 40, but protrude from the substrate 40. That is, the terminal electrodes E5A and E6A do not overlap with the substrate 40. The terminal electrode E5A is connected to the outer peripheral end of the coil pattern 500A through the lead pattern 511A provided on one surface 41 of the substrate 40 and the lead pattern 512A provided on the other surface 42 of the substrate 40. The lead pattern 511A and the lead pattern 512A are connected to each other through the through-hole conductor provided through the substrate 40. On the other hand, the terminal electrode E6A is connected to the outer peripheral end of the coil pattern 600A through the lead pattern 611A provided on one surface 41 of the substrate 40.

[0053] The terminal electrodes E3A, E4A, E5A, and E6A are extensions of the lead patterns 311A, 411A, 511A, and 611A, respectively, and are made of the same conductive material as the lead patterns 311A, 411A, 511A, and 611A. The terminal electrodes E3A, E4A, E5A, and E6A are formed on the surface of the substrate 40 simultaneously with the coil patterns 300A, 400A, 500A, and 600A and the lead patterns 311A, 312A, 411A, 511A, 512A, and 611A, and then the portions of the substrate 40 overlapping with the terminal electrodes E3A, E4A, E5A, and E6A are removed by irradiation with a laser beam or the like, thereby protruding from the substrate 40.

[0054] Although not particularly limited, the coil patterns 300A, 400A, 500A, and 600A are all divided into six parts in the radial direction by five spiral slits. For example, the coil pattern 400A is divided into six wires 401A to 406A, and each wire 401A to 406A is spirally wound in multiple turns. Similarly, the coil pattern 600A is divided into six wires 601A to 606A, and each wire 601A to 606A is spirally wound in multiple turns. The inner peripheral ends of the wires 401A to 406A are connected to the corresponding wires of the coil pattern 300A through the through-hole conductors T21 to T26 provided in the through-substrate 40. Similarly, the inner peripheral ends of the wires 601A to 606A are connected to the corresponding wires of the coil pattern 500A through the through-hole conductors T31 to T36 provided in the through-substrate 40.

[0055] Specifically, the wire 401A located on the outermost circumference side is connected to the innermost wire constituting the coil pattern 300A through the through-hole conductor T21, and the wire 406A located on the innermost circumference side is connected to the outermost wire constituting the coil pattern 300A through the through-hole conductor T26. Similarly, the wire 601A located on the outermost circumference side is connected to the innermost wire constituting the coil pattern 500A through the through-hole conductor T31, and the wire 606A located on the innermost circumference side is connected to the outermost wire constituting the coil pattern 500A through the through-hole conductor T36.

[0056] The coil patterns 300B, 400B, 500B, 600B, 300C, 400C, 500C, and 600C also have the same structure, and therefore, duplicate descriptions are omitted.

[0057] In the present invention, although each turn constituting each coil pattern is not necessarily divided into a plurality of lines, by dividing each turn into a plurality of lines, the uneven current density distribution can be alleviated. Furthermore, if the inner and outer peripheries of the coil pattern provided on one surface of the substrate and the coil pattern provided on the other surface of the substrate are replaced as described above, the inner and outer periphery difference between the lines is offset, the current density distribution is more uniform, and the DC resistance and AC resistance can be further reduced.

[0058] Figure 6 (a) is a schematic cross-sectional view of a portion where a lead pattern is formed, Figure 6 (b) is a schematic cross-sectional view of a portion where a terminal electrode is formed.

[0059] like Figure 6As shown in (a), the three lead patterns 111A, 111B, and 111C connected to the outer peripheral ends of the coil patterns 100A, 100B, and 100C overlap with each other via the substrates 20 and 30, and the three lead patterns 211A, 211B, and 211C connected to the coil patterns 200A, 200B, and 200C overlap with each other via the substrates 20 and 30. In addition, the three lead patterns 311A, 311B, and 311C connected to the outer peripheral ends of the coil patterns 300A, 300B, and 300C overlap with each other via the substrates 50 and 60, and the three lead patterns 411A, 411B, and 411C connected to the coil patterns 400A, 400B, and 400C overlap with each other via the substrates 50 and 60. Similarly, the three lead patterns 511A, 511B, and 511C respectively connected to the outer peripheral ends of the coil patterns 500A, 500B, and 500C overlap with each other via the substrates 50 and 60, and the three lead patterns 611A, 611B, and 611C respectively connected to the coil patterns 600A, 600B, and 600C overlap with each other via the substrates 50 and 60.

[0060] Hereinafter, the lead patterns 111A, 111B, and 111C are collectively referred to as lead patterns 111, the lead patterns 211A, 211B, and 211C are collectively referred to as lead patterns 211, the lead patterns 311A, 311B, and 311C are collectively referred to as lead patterns 311, the lead patterns 411A, 411B, and 411C are collectively referred to as lead patterns 411, the lead patterns 511A, 511B, and 511C are collectively referred to as lead patterns 511, and the lead patterns 611A, 611B, and 611C are collectively referred to as lead patterns 611. Here, the plane positions of the lead patterns 111, 211, 311, 411, 511, and 611 are different from each other.

[0061] like Figure 6As shown in (b), terminal electrodes E1, E2, E3, E4, E5, and E6 are respectively present on the extension lines of the lead patterns 111, 211, 311, 411, 511, and 611. Here, the terminal electrode E1 is composed of the terminal electrodes E1A, E1B, and E1C which are extensions of the lead patterns 111A, 111B, and 111C, the terminal electrode E2 is composed of the terminal electrodes E2A, E2B, and E2C which are extensions of the lead patterns 211A, 211B, and 211C, and the terminal electrode E3 is composed of the terminal electrodes E3A, E3B, and E3C which are extensions of the lead patterns 311A, 311B, and 311C. The terminal electrode E4 is composed of terminal electrodes E4A, E4B, and E4C which are extensions of lead-out patterns 411A, 411B, and 411C, the terminal electrode E5 is composed of terminal electrodes E5A, E5B, and E5C which are extensions of lead-out patterns 511A, 511B, and 511C, and the terminal electrode E6 is composed of terminal electrodes E6A, E6B, and E6C which are extensions of lead-out patterns 611A, 611B, and 611C.

[0062] The terminal electrode E1 protrudes from the substrates 10, 20, 30 and is provided at a position that does not overlap with the substrates 10, 20, 30, so that the corresponding three terminal electrodes E1A, E1B, and E1C can be easily connected. The other terminal electrodes E2, E3, E4, E5, and E6 are also the same. As a method for connecting the three terminal electrodes (for example, E1A, E1B, and E1C), although there is no particular limitation, it can be carried out by ultrasonic connection.

[0063] Therefore, if Figure 7 As shown in FIG. 1 , the coils formed by coil patterns 100A and 200A, the coils formed by coil patterns 100B and 200B, and the coils formed by coil patterns 100C and 200C are connected in parallel to form a center coil C0. In this way, the center coil C0 has three coils connected in parallel, so that about three times the current can flow compared to the case of using only one coil. However, the number of coils connected in parallel in the present invention is not limited to this.

[0064] Figure 8 (a) is a schematic cross-sectional view of a first modified example of a portion where a lead pattern is formed, Figure 8 (b) is a schematic cross-sectional view of a first modified example of a portion where a terminal electrode is formed.

[0065] exist Figure 8In the first variation shown, dummy patterns 111D and 211D are provided on the surfaces of substrates 40, 50, and 60. Here, dummy pattern 111D is provided at a position overlapping with lead pattern 111 in a top view, and dummy pattern 211D is provided at a position overlapping with lead pattern 211 in a top view. Moreover, dummy electrode D1 is provided on an extension line of dummy pattern 111D, and dummy electrode D2 is provided on an extension line of dummy pattern 211D. Dummy electrodes D1 and D2 are provided at positions that do not overlap with substrates 10, 20, 30, 40, 50, and 60, respectively, and overlap and are connected to terminal electrodes E1 and E2. By using such dummy electrodes D1 and D2, it is possible to Figure 8 In the state shown in (b) of FIG. 1 , the terminal electrodes E1 , E2 , E3 , E4 , E5 , and E6 are placed on a flat placing table S for ultrasonic connection. That is, there is an advantage that no bending stress is applied to the terminal electrodes E1 and E2 during ultrasonic connection.

[0066] Fig. 9 (a) is a schematic cross-sectional view of a second modified example of a portion having a lead-out pattern formed therein, Fig. 9 (b) is a schematic cross-sectional view of a second modified example of a portion where a terminal electrode is formed.

[0067] exist Fig. 9 In the second variation shown, dummy patterns 311D, 411D, 511D, and 611D are provided on the surfaces of substrates 10, 20, and 30. Here, dummy pattern 311D is provided at a position overlapping with lead pattern 311 in a top view, dummy pattern 411D is provided at a position overlapping with lead pattern 411 in a top view, dummy pattern 511D is provided at a position overlapping with lead pattern 511 in a top view, and dummy pattern 611D is provided at a position overlapping with lead pattern 611 in a top view. In addition, dummy electrode D3 is provided on an extension line of dummy pattern 311D, dummy electrode D4 is provided on an extension line of dummy pattern 411D, electrode D5 is provided on an extension line of dummy pattern 511D, and dummy electrode D6 is provided on an extension line of dummy pattern 611D. The dummy electrodes D3, D4, D5, and D6 are arranged at positions not overlapping with the substrates 10, 20, 30, 40, 50, and 60, respectively overlapping and connecting with the terminal electrodes E3, E4, E5, and E6. Fig. 9 In the case where ultrasonic connection is performed on the flat mounting table S with the terminal electrodes E1, E2, E3, E4, E5, and E6 as shown in (b), not only is there an advantage of not applying bending stress to the terminal electrodes E1 and E2, but also the conditions for ultrasonic connection of the terminal electrodes E1, E2, E3, E4, E5, and E6 can be made consistent.

[0068] Next, the planar shape of each coil pattern will be described.

[0069] Fig.10 It is a schematic plan view transparently showing the coil component 1 according to the present embodiment.

[0070] exist Fig.10 In FIG. 1 , the hatched area is a coil area including the innermost circumference to the outermost circumference of the coil pattern, that is, an area excluding the inner diameter area of ​​the coil pattern. The specific pattern shape in the coil area will be described later.

[0071] like Fig.10 As shown, a portion of the coil area of ​​the center coil C0 overlaps with the coil area of ​​the first side coil C1 in a top view, and another portion of the coil area of ​​the center coil C0 overlaps with the coil area of ​​the second side coil C2 in a top view. The coil area of ​​the first side coil C1 does not overlap with the coil area of ​​the second side coil C2. The coil area of ​​the first side coil C1 and the coil area of ​​the second side coil C2 have shapes that are symmetrical about the center of the center coil C0 in the x direction, and are configured in a manner that is symmetrical about the center of the center coil C0 in the x direction. In this embodiment, the widths of the coil areas of the center coil C0 and the side coils C1 and C2 in the y direction are the same as each other.

[0072] The center coil C0 and the side coils C1 and C2 each have an inner diameter region 70 to 72. The inner diameter region refers to a region surrounded by the coil pattern where no conductor pattern exists. Fig.10 As shown, in this embodiment, a portion of the inner diameter region 70 of the center coil C0 overlaps with the coil region of the first side coil C1, and another portion of the inner diameter region 70 of the center coil C0 overlaps with the coil region of the second side coil C2. In addition, the inner diameter region 71 of the first side coil C1 overlaps with the coil region of all the center coils C0, and the inner diameter region 72 of the second side coil C2 overlaps with the coil region of all the center coils C0.

[0073] In this way, the three coils C0 to C2 constituting the coil component 1 of the present embodiment are arranged in different positions in the x direction, so when used as a power supply coil of a contactless power transmission device, the power supply area is expanded in the x direction. For example, when the power receiving coil is in the area X0, the center coil C0 can be used to supply power, when the power receiving coil is in the area X1, the first side coil C1 can be used to supply power, and when the power receiving coil is in the area X2, the second side coil C2 can be used to supply power. The boundary between the area X0 and the area X1 is set, for example, between the inner diameter area 70 and the inner diameter area 71, and the boundary between the area X0 and the area X2 is set, for example, between the inner diameter area 70 and the inner diameter area 72.

[0074] Fig.111 is a circuit diagram of the coil component 1 according to the present embodiment and peripheral circuits connected thereto.

[0075] like Fig.11 As shown, the center coil C0 has a structure in which coil patterns 100A and 200A are connected in series, coil patterns 100B and 200B are connected in series, and coil patterns 100C and 200C are connected in series. Similarly, the first side coil C1 has a structure in which coil patterns 300A and 400A are connected in series, coil patterns 300B and 400B are connected in series, and coil patterns 300C and 400C are connected in series. The second side coil C2 has a structure in which coil patterns 500A and 600A are connected in series, coil patterns 500B and 600B are connected in series, and coil patterns 500C and 600C are connected in series.

[0076] When the coil component 1 of the present embodiment is used as a power supply coil of a contactless power transmission device, the center coil C0 or the side coils C1 and C2 are connected to the power supply circuit 4 by means of the switch 5. The switch 5 is a circuit that exclusively connects the power supply circuit 4 to the center coil C0 and the side coils C1 and C2, and its switching control is performed by the switching circuit 6. Thus, the current output from the power supply circuit 4 is supplied to any one of the center coil C0 and the side coils C1 and C2. The power supply circuit 4, the switch 5, and the switching circuit 6 can be provided on a circuit substrate 700 described later.

[0077] Fig.12 This is a schematic diagram showing the appearance of a wireless power supply device in the case where the coil component 1 of the present embodiment is used as a power supply coil of a contactless power transmission device.

[0078] exist Fig.12 In the example shown, the power receiving surface 3 forms an xy plane, and the wireless power receiving device RX is placed on the power receiving surface 3. The wireless power receiving device RX is, for example, a mobile terminal such as a smartphone. No positioning mechanism is provided between the power receiving surface 3 and the wireless power receiving device RX for accurately positioning the two, and the wireless power receiving device RX is placed on the power receiving surface 3 by the user. Fig.12 As shown, when the wireless power receiving device RX placed on the power receiving surface 3 is in the area X0, Fig.11The switching circuit 6 shown selects the center coil C0, and current flows from the power supply circuit 4 to the center coil C0, thereby transmitting power to the wireless power receiving device RX in a contactless manner. In contrast, assuming that the wireless power receiving device RX placed on the power receiving surface 3 is in the area X1, the first side coil C1 is selected by the switching circuit 6. In addition, when the wireless power receiving device RX placed on the power receiving surface 3 is in the area X2, the second side coil C2 is selected by the switching circuit 6. As a result, power can be correctly transmitted regardless of where the wireless power receiving device RX is placed on the power receiving surface 3. The position determination of the wireless power receiving device RX can be directly determined using a position sensor, etc., or can be performed indirectly by detecting the impedance of the coil component 1 or changes in the power waveform.

[0079] Fig.13 This is a schematic diagram showing the structure of a non-contact power transmission device using the coil component 1 according to the present embodiment.

[0080] Fig.13 The non-contact power transmission device shown is a system composed of a wireless power supply device TX and a wireless power receiving device RX, and wireless power transmission is performed by making the power supply coils C0 to C2 included in the wireless power supply device TX face the power receiving coil 7 included in the wireless power receiving device RX through a space 9. The power supply coils C0 to C2 are connected to a power supply circuit 4 including a power supply circuit, an inverter circuit, a resonance circuit, etc., and an AC current is supplied from the power supply circuit 4. The power receiving coil 7 is connected to a power receiving circuit 8 including a resonance circuit, a rectification circuit, a smoothing circuit, etc. In addition, by making the power supply coils C0 to C2 face the power receiving coil 7 and magnetically coupling the two, it is possible to wirelessly transmit power from the wireless power supply device TX to the wireless power receiving device RX through the space 9.

[0081] The magnetic sheet 2 is arranged on the opposite side of the space 9 from the power supply coils C0 to C2, and the magnetic sheet 2 is arranged on the opposite side of the space 9 from the power receiving coil 7. The magnetic sheet 2 has the effect of increasing the inductance of the power supply coils C0 to C2 and the power receiving coil 7, thereby enabling more efficient power transmission.

[0082] Next, a method of connecting the coil component 1 and the circuit board using the terminal electrodes E1 to E6 will be described.

[0083] Fig.14 This is a schematic diagram for explaining a first method of connecting the coil component 1 and the circuit board 700 .

[0084] In the first connection method, the coil component 1 is mounted on the surface of the circuit substrate 700 provided with the through hole 701, and the terminal electrodes E1 to E6 are bent by 90 degrees and inserted into the through hole 701, thereby connecting the coil component 1 to the circuit substrate 700. In this way, since the terminal electrodes E1 to E6 protrude from the substrate, the coil component 1 of this embodiment can be connected to the circuit substrate 700 by bending the terminal electrodes E1 to E6 and inserting them into the through hole 701. Alternatively, a method of mounting a connector on the circuit substrate 700 and inserting the terminal electrodes E1 to E6 into the connector without bending the terminal electrodes E1 to E6 can also be used.

[0085] Figure 15 to Figure 17 This is a schematic diagram for explaining a second method of connecting the coil component 1 and the circuit board 700 .

[0086] In the second connection method, use Fig.15 and Fig.16 The connector component 800 shown in FIG. 8 has six connector pins 801 to 806, and these connector pins 801 to 806 are connected to the terminal electrodes E1 to E6, respectively. The connector pins 801 to 806 are rod-shaped bodies made of metal such as copper and have a 90° bend. Fig.16 As shown, the connector pins 801 to 806 are supported by a support body 810 made of an insulating material such as resin, and the intervals between the connector pins 801 to 806 are kept constant. The connection between the connector pins 801 to 806 and the terminal electrodes E1 to E6 can be performed by ultrasonic connection. Fig.17 As shown, the coil component 1 is mounted on a circuit board 700 provided with a socket 702, and connector pins 801 to 806 are inserted into the socket 702, thereby establishing electrical connection between the coil component 1 and the circuit board. The coil component 1 can be fixed using an adhesive or the like.

[0087] In this way, the connection work between the coil component 1 and the circuit board 700 can be easily performed using the connector pins 801 to 806 connected to the terminal electrodes E1 to E6 , respectively.

[0088] Although preferred embodiments of the present invention have been described above, 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. Such modifications are naturally included in the scope of the present invention.

[0089] For example, the coil component 1 of the above embodiment includes 1 center coil C0 and 2 side coils C1 and C2, but this is not necessary in the present invention. Therefore, it can be composed of only the center coil C0, or only the side coil C1 or C2. In addition, it can be composed of 1 center coil C0 and 1 side coil C1, or it can be composed of 2 side coils C1 and C2. Furthermore, it is not necessary that the side coil C1 and the side coil C2 do not overlap in the top view, and they can also partially overlap each other in the top view.

[0090] In addition, the number of coil patterns constituting the center coil C0 and the side coils C1 and C2 and the number of turns of each coil pattern are not particularly limited. Furthermore, in the above-mentioned embodiment, two coil patterns (for example, coil patterns 100A and 200A) are formed on the front and back surfaces of the substrate, but this is not necessary in the present invention.

[0091] Description of Reference Numerals

[0092] 1 Coil components

[0093] 2 Magnetic Sheets

[0094] 3 Power receiving surface

[0095] 4 Power supply circuit

[0096] 5 Switch

[0097] 6 Switching Circuit

[0098] 7 Receiving coil

[0099] 8 Power receiving circuit

[0100] 9. Space

[0101] 10, 20, 30, 40, 50, 60 substrates

[0102] 11, 21, 31, 41, 51, 61 One surface of the substrate

[0103] 12, 22, 32, 42, 52, 62 The other surface of the substrate

[0104] 70~72 inner diameter area

[0105] 100A, 100B, 100C, 200A, 200B, 200C, 300A, 300B, 300C, 400A, 400B, 400C, 500A, 500B, 500C, 600A, 600B, 600C Coil Pattern

[0106] 111A, 111B, 111C, 112A, 211A, 211B, 211C, 311A, 311B, 311C, 312A, 411A, 411B, 411C, 511A, 511B, 511C, 512A, 611A, 611B, 611C lead pattern

[0107] 111D, 211D, 311D, 411D, 511D, 611D dummy patterns

[0108] 201A~206A、401A~406A、601A~606A Line

[0109] 700 Circuit Board

[0110] 701 Through hole

[0111] 702 socket

[0112] 800 Connector Parts

[0113] 801~806 Connector Pins

[0114] 810 Support

[0115] C0 Center Coil

[0116] C1, C2 side coil

[0117] D1~D6 dummy electrodes

[0118] E1~E6, E1A, E1B, E1C, E2A, E2B, E2C, E3A, E3B, E3C, E4A, E4B, E4C, E5A, E5B, E5C, E6A, E6B, E6C Terminal electrode

[0119] RX Wireless power receiving device

[0120] S loading table

[0121] T11~T16、T21~T26、T31~T36 Through-hole conductor

[0122] TX Wireless Power Supply

[0123] X0~X2 area.

Claims

1. A coil component, characterized in that: include: first and second substrates; a first coil pattern formed on one surface of the first substrate; a second coil pattern formed on one surface of the second substrate; a third coil pattern formed on the other surface of the first substrate; a fourth coil pattern formed on the other surface of the second substrate; a first terminal electrode connected to one end of the first coil pattern and protruding from the first substrate; a second terminal electrode connected to one end of the second coil pattern and protruding from the second substrate; a third terminal electrode connected to one end of the third coil pattern and protruding from the first substrate; a fourth terminal electrode connected to one end of the fourth coil pattern and protruding from the second substrate, third and fourth substrates; a fifth coil pattern formed on one surface of the third substrate; a sixth coil pattern formed on one surface of the fourth substrate; a fifth terminal electrode connected to one end of the fifth coil pattern and protruding from the third substrate; A sixth terminal electrode connected to one end of the sixth coil pattern and protruding from the fourth substrate; and first and second dummy electrodes protruding from the third substrate and not directly connected to any of the coil patterns, The other end of the first coil pattern and the other end of the third coil pattern are connected to each other. The other end of the second coil pattern is connected to the other end of the fourth coil pattern. The first and second substrates are stacked in such a manner that the first and second terminal electrodes overlap and are connected to each other, and the third and fourth terminal electrodes overlap and are connected to each other, The third and fourth substrates are stacked in such a manner that the fifth and sixth terminal electrodes overlap and are connected to each other, The first and second substrates are stacked with the third and fourth substrates in such a manner that a portion of the first to fourth coil patterns overlaps a portion of the fifth and sixth coil patterns, The first dummy electrode overlaps and is connected to the first and second terminal electrodes, The second dummy electrode overlaps with and is connected to the third and fourth terminal electrodes.

2. The coil component according to claim 1, wherein Also includes: a seventh coil pattern formed on the other surface of the third substrate; an eighth coil pattern formed on the other surface of the fourth substrate; A seventh terminal electrode connected to one end of the seventh coil pattern and protruding from the third substrate; and an eighth terminal electrode connected to one end of the eighth coil pattern and protruding from the fourth substrate, The other end of the fifth coil pattern is connected to the other end of the seventh coil pattern. The other end of the sixth coil pattern is connected to the other end of the eighth coil pattern. The third and fourth substrates are stacked in such a manner that the seventh and eighth terminal electrodes overlap and are connected to each other, The first and second substrates are stacked with the third and fourth substrates in such a manner that a portion of the first to fourth coil patterns overlaps a portion of the fifth to eighth coil patterns.

3. The coil component according to claim 2, wherein: further comprising third and fourth dummy electrodes protruding from the fourth substrate and not directly connected to any of the coil patterns, The third dummy electrode overlaps and is connected to the first and second terminal electrodes and the first dummy electrode. The fourth dummy electrode overlaps and is connected to the third and fourth terminal electrodes and the second dummy electrode.

4. The coil component according to claim 3, characterized in that Also includes: fifth and seventh dummy electrodes protruding from the first substrate and not directly connected to any of the coil patterns; and sixth and eighth dummy electrodes protruding from the second substrate and not directly connected to any of the coil patterns, The fifth and sixth dummy electrodes overlap and are connected to the fifth and sixth terminal electrodes, The seventh and eighth dummy electrodes overlap and are connected to the seventh and eighth terminal electrodes.

5. The coil component according to any one of claims 2 to 4, characterized in that: Also includes: a first connector pin connected to the first and second terminal electrodes; a second connector pin connected to the third and fourth terminal electrodes; a third connector pin connected to the fifth and sixth terminal electrodes; and A fourth connector pin is connected to the seventh and eighth terminal electrodes.

6. A non-contact power transmission device, characterized in that: include: The coil component according to claim 5; and a circuit substrate connected to the first to fourth coil patterns through the first and second connector pins, and connected to the fifth to eighth coil patterns through the third and fourth connector pins, The circuit substrate includes a switch that allows current to flow to the first to fourth coil patterns or the fifth to eighth coil patterns.

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