JP6996276B2 - Coil parts - Google Patents

Description

The present invention relates to a coil component, and more particularly to a coil component having a spiral flat conductor.

As coil parts used in various electronic devices, in addition to coil parts of the type in which a wire (coated conductor wire) is wound around a magnetic core, a spiral flat conductor is formed over multiple turns on the surface of an insulating layer or an insulating substrate. Type of coil parts are known. For example, Patent Document 1 discloses a coil component having a structure in which spiral coil portions are formed on the surfaces of a plurality of insulating layers and their inner peripheral ends are connected to each other.

In the coil component described in Patent Document 1, since the coil portion is formed on one surface of each insulating layer and the coil portion is not formed on the other surface of each insulating layer, the coils adjacent to each other in the stacking direction are formed. It is possible to prevent the parts from coming into contact with each other.

Japanese Unexamined Patent Publication No. 2008-20215

However, in the coil component described in Patent Document 1, there is a problem that the overall thickness becomes thick because an insulating layer is required for the number of coil portions. In order to reduce the number of the insulating layer or the insulating substrate, spiral coil portions may be formed on both sides of the insulating layer or the insulating substrate. In this case, the coil portions adjacent to each other in the stacking direction come into contact with each other. The problem of getting rid of it arises.

Therefore, an object of the present invention is to reduce the number of required insulating substrates in a coil component provided with a plurality of spiral flat conductors while preventing contact between coil portions adjacent to each other in the stacking direction.

The coil component according to the present invention has a first insulating substrate having a first surface and a second surface located opposite to the first surface, and a third insulating substrate facing the first surface of the first insulating substrate. On the opposite side of the fifth and fifth surfaces facing the second surface of the first insulating substrate and the second insulating substrate having the fourth surface located on the opposite side of the surface and the third surface. A third insulating substrate having a sixth surface located, a first coil portion formed on the first surface of the first insulating substrate and spirally wound over a plurality of turns, and a first. A second coil portion formed on the second surface of the insulating substrate and spirally wound over a plurality of turns, and a second coil portion formed on the fourth surface of the second insulating substrate and wound over a plurality of turns. A third coil portion wound in a spiral shape, a fourth coil portion formed on the sixth surface of the third insulating substrate and wound in a spiral shape over a plurality of turns, and a second coil portion. A first connection pattern formed on the third surface of the insulating substrate and connected to the inner peripheral end of the third coil portion, and a fourth coil portion formed on the fifth surface of the third insulating substrate. A second connection pattern connected to the inner peripheral end of the first coil portion is provided, and the inner peripheral end of the first coil portion and the inner peripheral end of the second coil portion are provided so as to penetrate the first insulating substrate. The first connection pattern and the second connection pattern are connected to each other through the connection portion, and the first connection pattern and the second connection pattern are connected to each other through the opening provided in the first insulating substrate.

According to the present invention, since the four coil portions spirally wound are formed on the three insulating substrates, the overall thickness can be reduced. Moreover, since the coil portions are formed only on one of the two surfaces facing each other, it is possible to prevent the coil portions adjacent to each other in the stacking direction from coming into contact with each other.

In the present invention, one outer peripheral end of the first and second coil portions and the outer peripheral end of the third coil portion are connected, and the other outer peripheral end of the first and second coil portions and the fourth coil portion are connected. The outer peripheral end may be connected. According to this, the first and second coil portions and the third and fourth coil portions can be connected in parallel.

In the present invention, the first to fourth coil portions may include a plurality of conductor portions separated in the radial direction by spiral slits. According to this, since the bias of the current density is reduced, it is possible to reduce the DC resistance and the AC resistance.

In the present invention, the plurality of conductor portions constituting the first coil portion include the first conductor portion and the second conductor portion located on the inner peripheral side of the first conductor portion, and the second coil portion. The plurality of conductor portions constituting the third conductor portion include a third conductor portion and a fourth conductor portion located on the inner peripheral side of the third conductor portion, and the plurality of conductor portions constituting the third coil portion include. The plurality of conductor portions including the fifth conductor portion and the sixth conductor portion located on the inner peripheral side of the fifth conductor portion and constituting the fourth coil portion are the seventh conductor portion and the seventh conductor portion. The inner peripheral end of the first conductor portion is connected to the inner peripheral end of the fourth conductor portion, including the eighth conductor portion located on the inner peripheral side of the conductor portion, and the inner peripheral edge of the second conductor portion. The end is connected to the inner peripheral end of the third conductor portion, the inner peripheral end of the fifth conductor portion is connected to the inner peripheral end of the eighth conductor portion, and the inner peripheral end of the sixth conductor portion is connected. , May be connected to the inner peripheral end of the seventh conductor portion. According to this, since the difference between the inner and outer circumferences of the conductor portion is reduced, it is possible to further reduce the DC resistance and the AC resistance.

In the present invention, the pattern shape of the first coil portion and the pattern shape of the second coil portion may be the same. According to this, it is possible to manufacture the first coil portion and the second coil portion by using the same mask. Moreover, even if the first insulating substrate is transparent or translucent, if most of the first coil portion and the second coil portion overlap, the visual inspection becomes easy. Further, in the present invention, the pattern shape of the third coil portion and the pattern shape of the fourth coil portion may be the same. According to this, it becomes possible to manufacture the third coil portion and the fourth coil portion by using the same mask.

As described above, according to the present invention, in a coil component provided with a plurality of spiral planar conductors, it is possible to reduce the number of required insulating substrates while preventing contact between coil portions adjacent to each other in the stacking direction. Become. This makes it possible to provide a coil component having a thin thickness.

FIG. 1 is a cross-sectional view showing the configuration of a coil component according to an embodiment of the present invention. FIG. 2 is a plan view showing the shape of the conductor pattern formed on the first surface 11 of the first insulating substrate 10. FIG. 3 is an equivalent circuit diagram of the first coil unit 100. FIG. 4 is a plan view showing the shape of the conductor pattern formed on the second surface 12 of the first insulating substrate 10. FIG. 5 is an equivalent circuit diagram of the second coil unit 200. FIG. 6 is a plan view showing the shape of the conductor pattern formed on the fourth surface 24 of the second insulating substrate 20. FIG. 7 is an equivalent circuit diagram of the third coil unit 300. FIG. 8 is a plan view showing the shape of the conductor pattern formed on the third surface 23 of the second insulating substrate 20. FIG. 9 is a plan view showing the shape of the conductor pattern formed on the sixth surface 36 of the third insulating substrate 30. FIG. 10 is an equivalent circuit diagram of the fourth coil unit 400. FIG. 11 is a plan view showing the shape of the conductor pattern formed on the fifth surface 35 of the third insulating substrate 30. FIG. 12 is an equivalent circuit diagram of a coil component according to an embodiment of the present invention. FIG. 13 is a schematic diagram showing a magnetic flux φ generated when a current is passed through a coil component according to an embodiment of the present invention. FIG. 14 is a schematic diagram for explaining the relationship between the length of the conductor portion and the magnetic field strength in the first and second coil portions 100 and 200. FIG. 15 is a cross-sectional view showing the configuration of a coil component according to a modified example. FIG. 16 is an equivalent circuit diagram of the coil component shown in FIG.

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

FIG. 1 is a cross-sectional view showing the configuration of a coil component according to an embodiment of the present invention.

As shown in FIG. 1, the coil components according to the present embodiment include the first to third insulating substrates 10, 20, 30 and the first coil formed on the first surface 11 of the first insulating substrate 10. The portion 100, the second coil portion 200 formed on the second surface 12 of the first insulating substrate 10, and the third coil portion 300 formed on the fourth surface 24 of the second insulating substrate 20. And a fourth coil portion 400 formed on the sixth surface 36 of the third insulating substrate 30. The fourth surface 24 of the second insulating substrate 20 is located on the opposite side of the third surface 23 facing the first surface 11 of the first insulating substrate 10 and is the sixth of the third insulating substrate 30. The surface 36 is located on the opposite side of the fifth surface 35 facing the second surface 12 of the first insulating substrate 10. No coil portion is formed on the third and fifth surfaces 23 and 35.

Although the details will be described later, the inner peripheral end of the first coil portion 100 and the inner peripheral end of the second coil portion 200 are a plurality of connecting portions TH11 to TH16 provided so as to penetrate the first insulating substrate 10. Are connected to each other via. Further, the inner peripheral end of the third coil portion 300 is a third surface 23 of the second insulating substrate 20 via a plurality of connecting portions TH21 to TH26 provided so as to penetrate the second insulating substrate 20. It is connected to the connection patterns P11 to P16 formed in. Further, the inner peripheral end of the fourth coil portion 400 is the fifth surface 35 of the third insulating substrate 30 via a plurality of connecting portions TH31 to TH36 provided so as to penetrate the third insulating substrate 30. It is connected to the connection patterns P21 to P26 formed in.

As shown in FIG. 1, the first insulating substrate 10 is provided with an opening 10a. The opening 10a is provided at a position where it overlaps with the connection patterns P11 to P16 and P21 to P26 in a plan view. As described above, the connection patterns P11 to P16 and the connection patterns P21 to P26 are short-circuited via the opening 10a.

The material of the insulating substrates 10, 20, and 30 is not particularly limited, but a transparent or translucent flexible material such as PET resin can be used. Further, the insulating substrates 10, 20 and 30 may be flexible substrates in which a glass cloth is impregnated with an epoxy resin. When the first insulating substrate 10 is transparent or translucent, the first coil portion 100 and the second coil portion 200 appear to overlap each other in a plan view. Therefore, depending on how they overlap, the appearance using an inspection device is used. Inspection becomes difficult. Although the details will be described later, in the coil component according to the present embodiment, most of the first coil portion 100 and the second coil portion 200 overlap in a plan view so that the visual inspection using the inspection device can be correctly performed. Is located in.

FIG. 2 is a plan view showing the shape of the conductor pattern formed on the first surface 11 of the first insulating substrate 10.

As shown in FIG. 2, on the first surface 11 of the first insulating substrate 10, a first coil portion 100 made of a flat conductor wound spirally over a plurality of turns is formed. In the example shown in FIG. 2, the first coil portion 100 has a 6-turn configuration including turns 110 to 160, the turn 110 is located on the outermost circumference, and the turn 160 is located on the innermost circumference. Further, each turn 110 to 160 is divided into six in the radial direction by five spiral slits. As a result, in the turns 110 to 160, the conductor portions 111 to 161 located on the outermost peripheral side, the conductor portions 112 to 162 located on the outer peripheral side second, and the conductor portions 113 to 163 located on the outer peripheral side third. , The conductor portions 114 to 164 located on the outer peripheral side fourth, the conductor portions 115 to 165 located on the fifth outer peripheral side, and the conductor portions 116 to 166 located on the innermost peripheral side.

The conductor portions 111 to 116 of the turn 110 located on the outermost circumference are connected to the terminal electrode E1a via the drawing pattern 191 extending in the radial direction. On the other hand, the inner peripheral ends of the conductor portions 161 to 166 of the turn 160 located on the innermost circumference are connected to the connecting portions TH11 to TH16, respectively.

As a result, as shown in FIG. 3, the conductor portions 111 to 161 located on the outermost peripheral side form the conductor portion A1 connected in series between the terminal electrode E1a and the connecting portion TH11, and the second outer peripheral portion. The conductor portions 112 to 162 located on the side constitute the conductor portion A2 connected in series between the terminal electrode E1a and the connection portion TH12, and the conductor portions 113 to 163 located on the third outer peripheral side form terminals. The conductor portion A3 connected in series between the electrode E1a and the connecting portion TH13 is formed, and the conductor portions 114 to 164 located fourth on the outer peripheral side are connected in series between the terminal electrode E1a and the connecting portion TH14. The connected conductor portions A4 are formed, and the fifth conductor portions 115 to 165 located on the outer peripheral side constitute the conductor portion A5 connected in series between the terminal electrode E1a and the connecting portion TH15, and are the innermost conductor portions A5. The conductor portions 116 to 166 located on the peripheral side constitute the conductor portion A6 connected in series between the terminal electrode E1a and the connecting portion TH16.

Each turn 110 to 160 constituting the first coil portion 100 has a circumferential region 100a in which the position in the radial direction does not change, and a transition region 100b in which the position in the radial direction changes. Six turns consisting of turns 110 to 160 are defined as boundaries. As shown in FIG. 2, in the present embodiment, both the outer peripheral end and the inner peripheral end of the first coil portion 100 are located in the transition region 100b. Further, when the virtual line L1 extending radially from the center point c1 of the first coil portion 100 is drawn, the transition region 100b is located on the virtual line L1. Further, the connection portion TH11 and the connection portion TH13 are arranged at positions symmetrical with each other about the virtual line L1, and the connection portion TH14 and the connection portion TH16 are arranged at positions symmetrical with each other with the virtual line L1 as the axis. There is. Further, the connection portion TH12 and the connection portion TH15 are arranged on the virtual line L1.

FIG. 2 also shows the position of the opening 10a provided in the first insulating substrate 10. As shown in FIG. 2, the opening 10a is provided at a position closer to the center point c1 than the connecting portions TH11 to TH16.

FIG. 4 is a plan view showing the shape of the conductor pattern formed on the second surface 12 of the first insulating substrate 10.

As shown in FIG. 4, the shape of the conductor pattern formed on the second surface 12 of the first insulating substrate 10 is the same as the shape of the conductor pattern formed on the first surface 11 of the first insulating substrate 10. It is the same. Therefore, the conductor patterns formed on the front and back surfaces of the first insulating substrate 10 can be manufactured by using the same mask, which makes it possible to significantly reduce the manufacturing cost.

The conductor pattern formed on the second surface 12 of the first insulating substrate 10 includes a second coil portion 200 made of a flat conductor spirally wound over a plurality of turns. The second coil portion 200 has a 6-turn configuration including turns 210 to 260, in which the turn 210 is located on the outermost circumference and the turn 260 is located on the innermost circumference. Further, each turn 210 to 260 is divided into six in the radial direction by five spiral slits. As a result, in turns 210 to 260, the conductor portions 211 to 261 located on the outermost peripheral side, the conductor portions 212 to 262 located on the outer peripheral side second, and the conductor portions 213 to 263 located on the outer peripheral side third. , The fourth conductor portion 214 to 264 located on the outer peripheral side, the fifth conductor portion 215 to 265 located on the outer peripheral side, and the conductor portion 216 to 266 located on the innermost peripheral side.

The conductor portions 211 to 216 of the turn 210 located on the outermost circumference are connected to the terminal electrode E2a via the drawing pattern 291 extending in the radial direction. On the other hand, the inner peripheral ends of the conductor portions 261 to 266 of the turn 260 located on the innermost circumference are connected to the connecting portions TH13, TH12, TH11, TH16, TH15 and TH14, respectively.

As a result, as shown in FIG. 5, the conductor portions 211 to 261 located on the outermost peripheral side constitute the conductor portion B1 connected in series between the terminal electrode E2a and the connecting portion TH13, and the second outer peripheral portion. The conductor portions 212 to 262 located on the side constitute the conductor portion B2 connected in series between the terminal electrode E2a and the connecting portion TH12, and the conductor portions 213 to 263 located on the third outer peripheral side form terminals. The conductor portion B3 connected in series between the electrode E2a and the connecting portion TH11 is formed, and the conductor portions 214 to 264 located fourth on the outer peripheral side are connected in series between the terminal electrode E2a and the connecting portion TH16. The connected conductor portions B4 are formed, and the fifth conductor portions 215 to 265 located on the outer peripheral side constitute the conductor portion B5 connected in series between the terminal electrode E2a and the connecting portion TH15, and are the innermost conductor portions B5. The conductor portions 216 to 266 located on the peripheral side constitute the conductor portion B6 connected in series between the terminal electrode E2a and the connecting portion TH14.

Each turn 210 to 260 constituting the second coil portion 200 has a circumferential region 200a in which the position in the radial direction does not change, and a transition region 200b in which the position in the radial direction changes. Since the first coil portion 100 and the second coil portion 200 have the same planar shape, the virtual line L1 is the outer peripheral end of the first coil portion 100 and the outer peripheral end of the second coil portion 200. It will pass between.

The first coil portion 100 and the second coil portion 200 having such a configuration have the first insulating substrate 10 so that the center points c1 of the first coil portion 100 and the second coil portion 200 coincide with each other and the terminal electrode E1a and the terminal electrode E2a overlap each other. Formed on the front and back. As a result, most of the circumferential region 100a of the turns 110 to 160 of the first coil portion 100 and the circumferential region 200a of the turns 210 to 260 of the second coil portion 200 overlap in a plan view. .. The inner peripheral ends of the conductor portions A1 to A6 constituting the first coil portion 100 are connected to the conductor portions B3, B2, B1, B6 and B6 constituting the second coil portion 200 via the connecting portions TH11 to TH16. It is connected to the inner peripheral ends of B5 and B4, respectively.

FIG. 6 is a plan view showing the shape of the conductor pattern formed on the fourth surface 24 of the second insulating substrate 20.

As shown in FIG. 6, the shape of the conductor pattern formed on the fourth surface 24 of the second insulating substrate 20 is a conductor formed on the front and back surfaces of the first insulating substrate 10 except for the position of the inner peripheral end. It has basically the same shape as the pattern.

The conductor pattern formed on the fourth surface 24 of the second insulating substrate 20 includes a third coil portion 300 made of a planar conductor spirally wound over a plurality of turns. The third coil portion 300 has a 6-turn configuration including turns 310 to 360, in which the turn 310 is located on the outermost circumference and the turn 360 is located on the innermost circumference. Further, each turn 310 to 360 is divided into six in the radial direction by five spiral slits. As a result, in turns 310 to 360, the conductor portions 311 to 361 located on the outermost peripheral side, the conductor portions 312 to 362 located on the outer peripheral side second, and the conductor portions 313 to 363 located on the outer peripheral side third. , The fourth conductor portion 314 to 364 located on the outer peripheral side, the fifth conductor portion 315 to 365 located on the outer peripheral side, and the conductor portion 316 to 366 located on the innermost peripheral side.

The conductor portions 311 to 316 of the turn 310 located on the outermost circumference are connected to the terminal electrode E1b via a drawing pattern 391 extending in the radial direction. The terminal electrode E1b has an area and a shape that covers the terminal electrode E1a. On the other hand, the inner peripheral ends of the conductor portions 361 to 366 of the turn 360 located on the innermost circumference are connected to the connecting portions TH21 to TH26, respectively. The connecting portions TH21 to TH26 are provided at positions overlapping with the opening portion 10a of the first insulating substrate 10 in a plan view.

As a result, as shown in FIG. 7, the conductor portions 311 to 361 located on the outermost peripheral side constitute the conductor portion C1 connected in series between the terminal electrode E1b and the connecting portion TH21, and the second outer peripheral portion. The conductor portions 312 to 362 located on the side constitute the conductor portion C2 connected in series between the terminal electrode E1b and the connecting portion TH22, and the conductor portions 313 to 363 located on the third outer peripheral side form terminals. The conductor portion C3 connected in series between the electrode E1b and the connecting portion TH23 is formed, and the conductor portions 314 to 364 located on the outer peripheral side at the fourth position are connected in series between the terminal electrode E1b and the connecting portion TH24. The connected conductor portions C4 are configured, and the fifth conductor portions 315 to 365 located on the outer peripheral side constitute the conductor portion C5 connected in series between the terminal electrode E1b and the connecting portion TH25, and are the innermost conductor portions C5. The conductor portions 316 to 366 located on the peripheral side constitute the conductor portion C6 connected in series between the terminal electrode E1b and the connecting portion TH26.

Each turn 310 to 360 constituting the third coil portion 300 has a circumferential region 300a in which the position in the radial direction does not change, and a transition region 300b in which the position in the radial direction changes. Six turns consisting of turns 310 to turn 360 are defined as boundaries. As shown in FIG. 6, in the present embodiment, both the outer peripheral end and the inner peripheral end of the third coil portion 300 are located in the transition region 300b. Further, when the virtual line L2 extending radially from the center point c2 of the third coil portion 300 is drawn, the transition region 300b is located on the virtual line L2. Further, the connection portion TH21 and the connection portion TH23 are arranged at positions symmetrical with respect to the virtual line L2, and the connection portion TH24 and the connection portion TH26 are arranged at positions symmetrical with respect to the virtual line L2. There is. Further, the connection portion TH22 and the connection portion TH25 are arranged on the virtual line L2.

FIG. 8 is a plan view showing the shape of the conductor pattern formed on the third surface 23 of the second insulating substrate 20.

As shown in FIG. 8, six connection patterns P11 to P16 are formed on the third surface 23 of the second insulating substrate 20. The connection patterns P11 to P16 are connected to the inner peripheral ends of the conductor portions C1 to C6 constituting the third coil portion 300, respectively, via the connection portions TH21 to TH26. Further, a terminal electrode E1c and a lead-out pattern 392 are provided on the third surface 23 of the second insulating substrate 20. The drawing pattern 392 is integrated with the terminal electrode E1c, and is provided on the fourth surface 24 of the second insulating substrate 20 via the connecting portion THa provided so as to penetrate the second insulating substrate 20. It is connected to pattern 391.

Further, the terminal electrode E1c overlaps with the terminal electrode E1a formed on the first surface 11 of the first insulating substrate 10 in a plan view, whereby the first insulating substrate 10 and the second insulating substrate 20 are overlapped with each other. When the terminals are overlapped with each other, the terminal electrode E1a and the terminal electrode E1c come into contact with each other. These terminal electrodes E1a, E1b, and E1c constitute one terminal electrode E1. In the present embodiment, two connecting portions THa are provided, but the number of connecting portions is not particularly limited.

FIG. 9 is a plan view showing the shape of the conductor pattern formed on the sixth surface 36 of the third insulating substrate 30.

As shown in FIG. 9, the shape of the conductor pattern formed on the sixth surface 36 of the third insulating substrate 30 is the same as the shape of the conductor pattern formed on the fourth surface 24 of the second insulating substrate 20. It is the same. Therefore, the conductor patterns formed on the fourth surface 24 and the sixth surface 36 can be manufactured by using the same mask, which makes it possible to significantly reduce the manufacturing cost.

The conductor pattern formed on the sixth surface 36 of the third insulating substrate 30 includes a fourth coil portion 400 made of a planar conductor spirally wound over a plurality of turns. The fourth coil portion 400 has a 6-turn configuration including turns 410 to 460, with the turn 410 located on the outermost circumference and the turn 460 located on the innermost circumference. Further, each turn 410 to 460 is divided into six in the radial direction by five spiral slits. As a result, in turns 410 to 460, the conductor portions 411 to 461 located on the outermost peripheral side, the conductor portions 412 to 462 located on the outer peripheral side second, and the conductor portions 413 to 463 located on the outer peripheral side third. , The fourth conductor portion 414 to 464 located on the outer peripheral side, the fifth conductor portion 415 to 465 located on the outer peripheral side, and the conductor portion 416 to 466 located on the innermost peripheral side.

The conductor portions 411 to 416 of the turn 410 located on the outermost circumference are connected to the terminal electrode E2b via the drawing pattern 491 extending in the radial direction. The terminal electrode E2b has an area and a shape that covers the terminal electrode E2a. On the other hand, the inner peripheral ends of the conductor portions 461 to 466 of the turn 460 located on the innermost circumference are connected to the connecting portions TH31 to TH36, respectively. The connecting portions TH31 to TH36 are provided at positions overlapping with the opening portion 10a of the first insulating substrate 10 in a plan view.

As a result, as shown in FIG. 10, the conductor portions 411 to 461 located on the outermost outer peripheral side constitute the conductor portion D1 connected in series between the terminal electrode E2b and the connecting portion TH33, and the second outer peripheral portion is formed. The conductor portions 412 to 462 located on the side constitute the conductor portion D2 connected in series between the terminal electrode E2b and the connecting portion TH32, and the conductor portions 413 to 463 located on the third outer peripheral side form terminals. The conductor portion D3 connected in series between the electrode E2b and the connecting portion TH31 is configured, and the conductor portions 414 to 464 located on the outer peripheral side at the fourth position are connected in series between the terminal electrode E2b and the connecting portion TH36. The connected conductor portion D4 is formed, and the fifth conductor portions 415 to 465 located on the outer peripheral side constitute the conductor portion D5 connected in series between the terminal electrode E2b and the connecting portion TH35, and are the innermost conductor portions D5. The conductor portions 416 to 466 located on the peripheral side constitute the conductor portion D6 connected in series between the terminal electrode E2b and the connecting portion TH34.

Each turn 410 to 460 constituting the fourth coil portion 400 has a circumferential region 400a in which the position in the radial direction does not change, and a transition region 400b in which the position in the radial direction changes. When the virtual line L3 extending radially from the center point c3 of the fourth coil portion 400 is drawn, the transition region 400b is located on the virtual line L3. Further, the connection portion TH31 and the connection portion TH33 are arranged at positions symmetrical with respect to the virtual line L3, and the connection portion TH34 and the connection portion TH36 are arranged at positions symmetrical with respect to the virtual line L3. There is. Further, the connection portion TH32 and the connection portion TH35 are arranged on the virtual line L3.

FIG. 11 is a plan view showing the shape of the conductor pattern formed on the fifth surface 35 of the third insulating substrate 30.

As shown in FIG. 11, the shape of the conductor pattern formed on the fifth surface 35 of the third insulating substrate 30 is the same as the shape of the conductor pattern formed on the third surface 23 of the second insulating substrate 20. It is the same. Therefore, the conductor patterns formed on the third surface 23 and the fifth surface 35 can be manufactured by using the same mask, which makes it possible to significantly reduce the manufacturing cost. Moreover, as described above, the shape of the conductor pattern formed on the fourth surface 24 of the second insulating substrate 20 and the shape of the conductor pattern formed on the sixth surface 36 of the third insulating substrate 30 are also the same. Therefore, the second insulating substrate 20 and the conductor patterns formed on both sides thereof and the third insulating substrate 30 and the conductor patterns formed on both sides thereof have the same configuration. Therefore, it is not necessary to make them separately.

As shown in FIG. 11, six connection patterns P21 to P26 are formed on the fifth surface 35 of the third insulating substrate 30. The connection patterns P21 to P26 are connected to the inner peripheral ends of the conductor portions D1 to D6 constituting the fourth coil portion 400, respectively, via the connection portions TH31 to TH36. Further, a terminal electrode E2c and a drawing pattern 492 are provided on the fifth surface 35 of the third insulating substrate 30. The drawing pattern 492 is integrated with the terminal electrode E2c, and is provided on the sixth surface 36 of the third insulating substrate 30 via the connecting portion THb provided so as to penetrate the third insulating substrate 30. It is connected to pattern 491.

Further, the terminal electrode E2c overlaps with the terminal electrode E2a formed on the second surface 12 of the first insulating substrate 10 in a plan view, whereby the first insulating substrate 10 and the third insulating substrate 30 are overlapped with each other. When the above is overlapped, the terminal electrode E2a and the terminal electrode E2c come into contact with each other. These terminal electrodes E2a, E2b, and E2c constitute one terminal electrode E2. In the present embodiment, two connecting portions THb are provided, but the number of connecting portions is not particularly limited.

The above is the pattern shape of the conductor pattern provided on each of the insulating substrates 10, 20 and 30. Then, if the first insulating substrate 10 is sandwiched between the second insulating substrate 20 and the third insulating substrate 30 so that the center points c1 to c3 overlap and the virtual lines L1 to L3 overlap, the broken line in FIG. As shown by a, the connection patterns P11, P12, P13, P14, P15, P16 and the connection patterns P23, P22, P21, P26, P25, P24 are short-circuited through the opening 10a, respectively. The connection via the opening 10a can be realized by using, for example, welding.

As a result, the first to fourth coil portions 100, 200, 300, and 400 are connected as shown in FIG. 12, and a configuration in which two spiral coils with a total of 12 turns are connected in parallel can be obtained. As described above, the coil component according to the present embodiment includes four coil portions 100, 200, 300, 400 wound in a spiral shape, and these are formed on the three insulating substrates 10, 20, 30. Therefore, it is possible to make the entire thickness thinner. Moreover, the coil portion is not formed on the third surface 23 of the second insulating substrate 20 facing the first coil portion 100, and the third insulating substrate 30 facing the second coil portion 200. Since the coil portion is not formed on the fifth surface 35, the coil portions adjacent to each other in the stacking direction are not short-circuited.

Moreover, since each turn of the coil component according to the present embodiment is divided into six in the radial direction by a spiral slit, the deviation of the current density is reduced as compared with the case where such a slit is not provided. As a result, DC resistance and AC resistance can be reduced.

Further, in the present embodiment, as shown in FIG. 12, the conductor portion A1 is connected to the conductor portion B3 via the connecting portion TH11, and the conductor portion A2 is connected to the conductor portion B2 via the connecting portion TH12. The portion A3 is connected to the conductor portion B1 via the connecting portion TH13, the conductor portion A4 is connected to the conductor portion B6 via the connecting portion TH14, and the conductor portion A5 is connected to the conductor portion B5 via the connecting portion TH15. The conductor portion A6 is connected to the conductor portion B4 via the connecting portion TH16.

Further, the conductor portion C1 is connected to the conductor portion D3 via the connection portion TH21, the connection pattern P11, the connection pattern P23 and the connection portion TH33, and the conductor portion C2 is connected to the connection portion TH22, the connection pattern P12, the connection pattern P22 and the connection portion C2. The conductor portion C3 is connected to the conductor portion D2 via the portion TH32, the conductor portion C3 is connected to the conductor portion D1 via the connection portion TH23, the connection pattern P13, the connection pattern P21 and the connection portion TH31, and the conductor portion C4 is connected to the conductor portion TH24. , The conductor portion C5 is connected to the conductor portion D6 via the connection portion P14, the connection pattern P26 and the connection portion TH36, and the conductor portion C5 is connected to the conductor portion D5 via the connection portion TH25, the connection pattern P15, the connection pattern P25 and the connection portion TH35. The conductor portion C6 is connected to the conductor portion D4 via the connection portion TH26, the connection pattern P16, the connection pattern P24, and the connection portion TH34.

As described above, in the coil component according to the present embodiment, the radial positions of the conductor portions are exchanged between the first coil portion 100 and the second coil portion 200, and the third coil portion 300 and the fourth coil portion are fourth. Since the radial position of the conductor portion is exchanged with the coil portion 400 of the above, the difference between the inner and outer circumferences is reduced.

For example, the conductor portion A1 and the conductor portion B1 have the same length, the conductor portion A3 and the conductor portion B3 have the same length, and the conductor portions A1 and B1 are longer than the conductor portions A3 and B3. Is long. However, in the present embodiment, since the conductor portion A1 and the conductor portion B3 are connected and the conductor portion A3 and the conductor portion B1 are connected, the total lengths of the two are completely the same. This length is almost the same as the total length of the conductor portion A2 and the conductor portion B2. Similarly, the conductor portion A4 and the conductor portion B4 have the same length, the conductor portion A6 and the conductor portion B6 have the same length, and the conductor portions A4 and B4 have more than the conductor portions A6 and B6. The length is long. However, since the conductor portion A4 and the conductor portion B6 are connected, and the conductor portion A6 and the conductor portion B4 are connected, the total lengths of the two are completely the same. This length is almost the same as the total length of the conductor portion A5 and the conductor portion B6. As a result, the difference between the inner and outer circumferences is relaxed, so that the DC resistance and the AC resistance can be further reduced.

Further, when a current is passed through the coil component according to the present embodiment, a magnetic flux φ is generated as shown in FIG. The magnetic flux φ passes through the inner diameter region of the first to fourth coil portions 100, 200, 300, 400 and orbits the outside of the first to fourth coil portions 100, 200, 300, 400. Therefore, in the portion closer to the innermost turn of the first to fourth coil portions 100, 200, 300, 400, and in the outermost outer turn of the first to fourth coil portions 100, 200, 300, 400. In the near part, the magnetic field becomes stronger and the AC resistance tends to increase locally.

FIG. 14 is a schematic diagram for explaining the relationship between the length of the conductor portion and the magnetic field strength in the first and second coil portions 100 and 200.

As shown in FIG. 14, focusing on the conductor portions 111 to 116 constituting the turn 110, the conductor portion 111 is located on the outermost peripheral side, and the conductor portion 116 is located on the innermost peripheral side. Therefore, as shown by the arrow L, the conductor portions 111 to 116 have the longest length and the shortest conductor portion 116. Similarly, focusing on the conductor portions 161 to 166 constituting the turn 160, the conductor portion 161 is located on the outermost peripheral side, and the conductor portion 166 is located on the innermost peripheral side. Therefore, as shown by the arrow L, the lengths of the conductor portions 161 to 166 are the longest in the conductor portion 161 and the shortest in the conductor portion 166. In short, the conductor portion A1 is the longest and the conductor portion A6 is the shortest. The above points are the same in the second coil portion 200, where the conductor portion B1 is the longest and the conductor portion B6 is the shortest.

On the other hand, as for the magnetic field, as described above, the magnetic field becomes stronger as the portion closer to the innermost turn and the portion closer to the outermost turn. Therefore, in the turn 110 located on the outermost circumference, as shown by the arrow F, the magnetic field is the strongest in the conductor portion 111 located on the outer peripheral side, and the magnetic field is the weakest in the conductor portion 116 located on the inner peripheral side. On the contrary, in the turn 160 located on the innermost circumference, as shown by the arrow F, the magnetic field is the strongest in the conductor portion 166 located on the inner peripheral side, and the magnetic field is the weakest in the conductor portion 161 located on the outer peripheral side. .. The above points are the same for the second coil portion 200, and in the turn 210 located at the outermost circumference, the magnetic field is the strongest at the conductor portion 211 located on the outer peripheral side as shown by the arrow F, and the inner circumference is the same. The magnetic field is the weakest in the conductor portion 216 located on the side. On the contrary, in the turn 260 located on the innermost circumference, as shown by the arrow F, the magnetic field is the strongest in the conductor portion 266 located on the inner peripheral side, and the magnetic field is the weakest in the conductor portion 261 located on the outer peripheral side. ..

Therefore, if the first coil portion 100 and the second coil portion 200 are connected in a combination that minimizes the difference between the inner and outer circumferences, the conductor portions that are strongly affected by the magnetic field are connected to each other, and the AC resistance increases. Will end up. That is, in order to minimize the difference between the inner and outer circumferences, the conductor portion A1 located on the outermost circumference and the conductor portion B6 located on the innermost circumference are connected, and the conductor portion A6 located on the innermost circumference and the conductor portion B6 located on the outermost circumference are located. The conductor portion B1 may be connected, but in this case, since the conductor portion 111 having the strongest magnetic field in turn 110 and the conductor portion 266 having the strongest magnetic field in turn 260 are connected, the AC resistance in the combination is significantly increased. It will be expensive. Similarly, since the conductor portion 166 having the strongest magnetic field in turn 160 and the conductor portion 211 having the strongest magnetic field in turn 210 are connected, the AC resistance in the combination becomes significantly high.

In consideration of this point, in the present embodiment, instead of connecting the conductor portion A1 located on the outermost circumference and the conductor portion B6 located on the innermost circumference, the conductor portion A1 located on the outermost circumference and the conductor portion B6 located on the outermost circumference are located. By connecting the conductor parts B1 and the conductor parts other than the conductor part B6 located on the innermost circumference (that is, any of B2 to B5), a combination that is strongly affected by the magnetic field while alleviating the difference between the inner and outer circumferences can be obtained. I'm avoiding it. As a result, the combination that specifically increases the AC resistance does not occur, and the influence of the magnetic field becomes more uniform. As a result, the AC resistance is reduced, and the difference between the DC resistance and the AC resistance can be reduced. Become.

The above points are the same in the connection relationship between the third coil portion 300 and the fourth coil portion 400.

Further, in the present embodiment, except for the transition regions 100b and 200b, most of the first coil portion 100 and the second coil portion 200 overlap in a plan view, so that the first insulating substrate 10 is transparent or semi-transparent. Even when it is transparent, the visual interference between the first coil portion 100 and the second coil portion 200 can be minimized. That is, the second coil portion 200 does not become a visual obstacle when visually inspecting the first coil portion 100, and conversely, the first coil portion 100 is not visually inspected when the second coil portion 200 is visually inspected. Does not become a visual obstacle. This makes it possible to correctly perform a visual inspection using an inspection device.

Further, in the coil component according to the present embodiment, the outer peripheral ends and the inner peripheral ends of the first to fourth coil portions 100, 200, 300, 400 are arranged in the transition regions 100b, 200b, 300b, 400b. It is also possible to prevent the outer diameter of the coil portion from becoming larger and the inner diameter region of the coil from decreasing due to the increase in the circumferential regions 100a, 200a, 300a, and 400a.

FIG. 15 is a cross-sectional view showing the configuration of a coil component according to a modified example.

As for the coil component shown in FIG. 15, a fourth insulating substrate 40 and a fifth insulating substrate 50 are added to the coil component shown in FIG. A fifth coil portion 500 is formed on the surface 41 of the fourth insulating substrate 40, and a connection pattern P3 connected to the inner peripheral end of the fifth coil portion 500 is formed on the surface 42 of the fourth insulating substrate 40. It is formed. Similarly, a sixth coil portion 600 is formed on the surface 51 of the fifth insulating substrate 50, and a connection connected to the inner peripheral end of the sixth coil portion 600 is formed on the surface 52 of the fifth insulated substrate 50. The pattern P4 is formed. Further, since the surface 42 of the fourth insulating substrate 40 and the surface 24 of the second insulating substrate 20 face each other, the third coil portion 300 and the fifth coil portion 500 do not come into contact with each other. Similarly, since the surface 52 of the fifth insulating substrate 50 and the surface 36 of the third insulating substrate 30 face each other, the fourth coil portion 400 and the sixth coil portion 600 do not come into contact with each other.

As shown in FIG. 15, openings 10a, 20a, and 30a are formed in the first to third insulating substrates 10, 20, and 30, respectively, at positions overlapping with the connection patterns P3 and P4 in a plan view. As a result, when the first to fifth insulating substrates 10, 20, 30, 40, and 50 are overlapped, the connection pattern P3 and the connection pattern P4 are short-circuited as shown by the broken line b. Since the other configurations are the same as those of the coil components shown in FIG. 1, the same elements are designated by the same reference numerals, and duplicate description will be omitted.

FIG. 16 is an equivalent circuit diagram of the coil component shown in FIG. As shown in FIG. 16, the coil parts shown in FIG. 15 include the first and second coil portions 100 and 200, the third and fourth coil portions 300 and 400, and the fifth and sixth coil portions 500. , 600 have a configuration in which they are connected in parallel. This makes it possible to further reduce the DC resistance and the AC resistance as compared with the coil components shown in FIG.

As illustrated by the coil component shown in FIG. 15, the number of insulating substrates used in the coil component according to the present invention is not limited to three. Further, the number of coil portions may be further increased by adding the sixth and seventh insulating substrates.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention, and these are also the present invention. Needless to say, it is included in the range.

For example, in the above embodiment, the pattern shapes of the coil portions are the same as each other, but this point is not essential in the present invention.

Further, in the above embodiment, each turn of the first to fourth coil portions 100, 200, 300, 400 is divided into six in the radial direction by a spiral slit, but in the present invention, the number of divisions of each turn is divided. Is not particularly limited. Also, not all turns need to be radially separated by spiral slits. Further, each turn may be configured by one conductor pattern without dividing each turn.

Further, in the above embodiment, the outer peripheral end of the first coil portion 100 and the outer peripheral end of the third coil portion 300 are connected to each other, and the outer peripheral end of the second coil portion 200 and the outer peripheral end of the fourth coil portion 400 are connected to each other. Are connected to each other, but the connection relationship at the outer peripheral end is not particularly limited. Therefore, the outer peripheral end of the first coil portion 100 and the outer peripheral end of the fourth coil portion 400 are connected to each other, and the outer peripheral end of the second coil portion 200 and the outer peripheral end of the third coil portion 300 are connected to each other. It doesn't matter. Further, the first to fourth coil portions 100, 200, 300, and 400 may all be connected in series.

10 First Insulated Substrate 10a, 20a, 30a Opening 11 First Surface 12 Second Surface 20 Second Insulated Substrate 23 Third Surface 24 Fourth Surface 30 Third Insulated Substrate 35 Fifth Surface 36 6th surface 40 4th insulated substrate 41, 42 Surface 50 5th insulated substrate 51, 52 Surface 100 1st coil portion 200 2nd coil portion 300 3rd coil portion 400 4th coil portion 500 Fifth coil portion 600 Sixth coil portion 100a, 200a, 300a, 400a Circumferential region 100b, 200b, 300b, 400b Transition region 110 to 160, 210 to 260, 310 to 360, 410 to 460 Turns 111 to 116, 121 to 126,131 to 136,141 to 146,151 to 156,161 to 166,211 to 216,221 to 226,231 to 236,241 to 246,251 to 256,261 to 266,311 to 316,321 to 326,331 to 336,341 to 346,351 to 356,361 to 366,411 to 416,421 to 426,431 to 436,441 to 446,451 to 456,461 to 466 Conductor parts 191,291,391,392 , 491,492 Drawer pattern A1 to A6, B1 to B6, C1 to C6, D1 to D6 Conductor part c1 to c3 Center points E1, E1a, E1b, E1c, E2, E2a, E2b, E2c Terminal electrodes L1 to L3 Virtual line P11 to P16, P21 to P26, P3, P4 Connection pattern TH11 to TH16, TH21 to TH26, TH31 to TH36 Connection part THa, THb connection part φ magnetic flux

Claims (7)

A first insulating substrate having a first surface and a second surface located on the opposite side of the first surface.
A second insulating substrate having a third surface facing the first surface of the first insulating substrate and a fourth surface located on the opposite side of the third surface.
A third insulating substrate having a fifth surface facing the second surface of the first insulating substrate and a sixth surface located opposite the fifth surface.
A first coil portion formed on the first surface of the first insulating substrate and spirally wound over a plurality of turns.
A second coil portion formed on the second surface of the first insulating substrate and spirally wound over a plurality of turns, and a second coil portion.
A third coil portion formed on the fourth surface of the second insulating substrate and spirally wound over a plurality of turns, and a third coil portion.
A fourth coil portion formed on the sixth surface of the third insulating substrate and spirally wound over a plurality of turns, and a fourth coil portion.
A first connection pattern formed on the third surface of the second insulating substrate and connected to the inner peripheral end of the third coil portion.
A second connection pattern formed on the fifth surface of the third insulating substrate and connected to the inner peripheral end of the fourth coil portion is provided.
The inner peripheral end of the first coil portion and the inner peripheral end of the second coil portion are connected to each other via a connecting portion provided through the first insulating substrate.
A coil component characterized in that the first connection pattern and the second connection pattern are connected to each other via an opening provided in the first insulating substrate. One outer peripheral end of the first and second coil portions and the outer peripheral end of the third coil portion are connected, and the other outer peripheral end of the first and second coil portions and the fourth coil portion. The coil component according to claim 1, wherein the outer peripheral end is connected. The coil component according to claim 1 or 2, wherein each of the first to fourth coil portions includes a plurality of conductor portions radially separated by a spiral slit. The plurality of conductor portions constituting the first coil portion include a first conductor portion and a second conductor portion located on the inner peripheral side of the first conductor portion.
The plurality of conductor portions constituting the second coil portion include a third conductor portion and a fourth conductor portion located on the inner peripheral side of the third conductor portion.
The plurality of conductor portions constituting the third coil portion include a fifth conductor portion and a sixth conductor portion located on the inner peripheral side of the fifth conductor portion.
The plurality of conductor portions constituting the fourth coil portion include a seventh conductor portion and an eighth conductor portion located on the inner peripheral side of the seventh conductor portion.
The inner peripheral end of the first conductor portion is connected to the inner peripheral end of the fourth conductor portion.
The inner peripheral end of the second conductor portion is connected to the inner peripheral end of the third conductor portion.
The inner peripheral end of the fifth conductor portion is connected to the inner peripheral end of the eighth conductor portion.
The coil component according to claim 3, wherein the inner peripheral end of the sixth conductor portion is connected to the inner peripheral end of the seventh conductor portion. The coil component according to any one of claims 1 to 4, wherein the pattern shape of the first coil portion and the pattern shape of the second coil portion are the same. The coil component according to claim 5, wherein the first insulating substrate is transparent or translucent. The coil component according to any one of claims 1 to 6, wherein the pattern shape of the third coil portion and the pattern shape of the fourth coil portion are the same.

Images