JP2014053366A - Coil device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a reduction effect of radiation which does not require an electromagnetic wave by improving a coupling between coils for power transmission.SOLUTION: A coil device L1 comprises a first shield part 30 arranged on a side opposite to a facing surface of a first coil 10 facing a second coil 20. The first shield part 30 comprises a first magnetic body 40 and a first conductor 50 arranged on a side opposite to a facing surface of the first magnetic body 40 facing the first coil 10. The first magnetic body 40 comprises a first base 41 and a first projecting portion 42 extending from the first base 41. The first conductor 50 comprises a second base 51 and a second projecting portion 52 extending from the second base 51. An edge of the first projecting portion 42 and an edge of the second projecting portion 52 are located between the first coil 10 and the second coil 20.

Description

  The present invention relates to a coil device.

  In recent years, wireless power transmission without using a power cord or a power transmission cable has attracted attention as a power transmission method. As this wireless power transmission technology, two technologies, known as power transmission using electromagnetic induction and power transmission using magnetic field resonance, are known.

  Compared with the wireless power transmission method using electromagnetic induction, the wireless power transmission method using magnetic field resonance has a feature that a large amount of power can be transmitted over a long distance. Specifically, several kW of high power can be transmitted over a distance of several meters.

  By the way, when performing high-power power transmission by wireless, there is a problem that unnecessary radiation of electromagnetic waves is generated in a space outside the power transmission device and adversely affects peripheral electronic devices.

  In order to solve the above problems, Patent Document 1 proposes a technique for reducing unnecessary radiation by arranging a rod-shaped magnetic body and a conductor (aluminum) behind a coil.

US Publication 2012/0025602

  However, in the technique disclosed in Patent Document 1, since the magnetic body arranged behind the coil is rod-shaped, it is difficult to form a magnetic path between the coils, and it is difficult to increase the coupling between the coils. Therefore, the power transmission efficiency between the coils does not increase, and the magnetic flux that has not contributed to the power transmission leaks to the outside, so that there is a problem that unnecessary radiation is not sufficiently reduced.

  The present invention has been made in view of the above problems, and an object of the present invention is to improve the coupling between coils that transmit power and to improve the effect of reducing unnecessary radiation of electromagnetic waves.

  The coil device according to the present invention includes first and second coils, and a first shield part disposed on the opposite side of the first coil opposite to the facing surface facing the second coil. The one shield portion has a first magnetic body and a first conductor disposed on the opposite side of the first magnetic body opposite to the facing surface facing the first coil. Has a first base and a first protrusion extending from the first base, and the first conductor has a second base and a second protrusion extending from the second base. The edge of the first protrusion and the edge of the second protrusion are located between the first coil and the second coil.

  According to the present invention, on the opposite side of the first coil from the facing surface facing the second coil, the first magnetic body and the facing surface facing the first coil of the first magnetic body are And a first shield portion having a first conductor disposed on the opposite side. Here, the magnetic body has an action of reducing the magnetic resistance of the magnetic path, and the conductor has an action of absorbing magnetic flux leaking to the outside. Therefore, when the first shield part has the first magnetic body, the magnetic resistance of the magnetic path is reduced and the coupling between the coils is increased. As a result, the power transmission efficiency between the coils can be improved, and unnecessary radiation of electromagnetic waves can be reduced. Moreover, since the magnetic flux which leaked outside is absorbed because a 1st shield part has a 1st conductor, the unnecessary radiation of electromagnetic waves can be reduced. Here, the action of absorbing the magnetic flux leaking to the outside means a phenomenon in which the magnetic flux is canceled out by the eddy current effect of the magnetic flux interlinking with the conductor.

  Furthermore, in the coil device according to the present invention, the first magnetic body includes a first base, a first protrusion extending from the first base, the first conductor is a second base, and a second base A second protrusion extending from the base of the first protrusion, and an edge of the first protrusion and an edge of the second protrusion are located between the first coil and the second coil. Therefore, the first magnetic body having an action of reducing the magnetic resistance of the magnetic path includes the first protrusion, and the edge of the first protrusion is located between the first coil and the second coil. Thus, the magnetic resistance of the magnetic path is reduced and the coupling between the coils is increased. As a result, the power transmission efficiency between the coils is improved, and the effect of reducing unnecessary radiation of electromagnetic waves can be improved. The first conductor having an action of absorbing the magnetic flux leaking to the outside includes the second protrusion, and the edge of the second protrusion is located between the first coil and the second coil. Therefore, the magnetic flux leaking in the direction orthogonal to the facing direction of the first coil and the second coil is also absorbed by the second protrusion, so that no electromagnetic wave is required. The effect of reducing radiation can be improved.

  Preferably, a second shield part is further provided on the opposite side of the second coil facing the first coil, and the second shield part comprises a second magnetic body and a second magnetic body. A second conductor disposed on the opposite side of the opposing surface facing the second coil, and the second magnetic body includes a third base and a third base extending from the third base. A second conductor having a fourth base and a fourth protrusion extending from the fourth base; an edge of the third protrusion and an edge of the fourth protrusion; The part is located between the first coil and the second coil.

  In this case, on the side of the second coil opposite to the surface facing the first coil, the second magnetic body having an action of reducing the magnetic resistance of the magnetic path includes the third protrusion, Since the edge of the protrusion is extended so as to be positioned between the first coil and the second coil, the action of reducing the magnetic resistance of the magnetic path is increased, and the coupling between the coils is increased. Increased further. As a result, the power transmission efficiency between the coils is improved, and the effect of reducing unnecessary radiation of electromagnetic waves can be improved. In addition, on the side of the second coil opposite to the facing surface facing the first coil, the second conductor having the function of absorbing the magnetic flux leaked to the outside includes the fourth protrusion, Since the edge of the protrusion is extended so as to be positioned between the first coil and the second coil, in a direction orthogonal to the opposing direction of the first coil and the second coil The absorption action of the leaking magnetic flux increases, and the effect of reducing unnecessary radiation of electromagnetic waves can be improved.

  Preferably, the first conductor includes a first extension extending from the edge of the second protrusion in a direction different from the extending direction of the second protrusion.

  In this case, the magnetic flux that leaks in the direction orthogonal to the opposing direction of the first coil and the second coil is provided by the first conductor having the function of absorbing the magnetic flux leaking to the outside having the first extension. The effect of reducing unnecessary radiation of electromagnetic waves can be further improved.

  Preferably, the first conductor includes a first extension extending from the edge of the second protrusion in a direction different from the extending direction of the second protrusion, and the second conductor includes the first conductor A second extension extending from the edge of the four protrusions in a direction different from the extending direction of the fourth protrusion is provided.

  In this case, the first conductor having the function of absorbing the magnetic flux leaking outside includes the first extension, and the second conductor having the function of absorbing the magnetic flux leaking to the outside is the second extension. With this, the action of absorbing magnetic flux leaking in the direction orthogonal to the opposing direction of the first coil and the second coil is further increased, and the effect of reducing unnecessary radiation of electromagnetic waves can be further improved. .

  According to the coil device of the present invention, it is possible to increase the coupling between coils that transmit power and to improve the effect of reducing unnecessary radiation of electromagnetic waves.

It is sectional drawing which shows the structure of the coil apparatus which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the structure of the coil apparatus which concerns on 2nd Embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Embodiments (embodiments) for carrying out the present invention will be described in detail with reference to the drawings. In the description, the same reference numerals are used for the same elements or elements having the same function, and redundant description is omitted.

(First embodiment)
First, the configuration of the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a cross-sectional view showing a configuration of a coil device L1 according to the first embodiment of the present invention.

  As shown in FIG. 1, the coil device L <b> 1 includes a first coil 10, a second coil 20, a first shield part 30, and a second shield part 60. The first coil 10 and the second coil 20 are arranged with a predetermined distance therebetween, and power is transmitted and received wirelessly.

  The first coil 10 is disposed in or near the ground. Here, in order to increase the power transmission efficiency with the second coil 20, the first coil 10 has a coil diameter and the number of turns so that the degree of coupling between the first coil 10 and the second coil 20 is increased. Is appropriately set.

  The second coil 20 is configured to receive power from the first coil 10, and is preferably arranged coaxially with the first coil 10. Here, the second coil 20 has a coil diameter and a number of turns so that the degree of coupling between the first coil 10 and the second coil 20 is increased in order to increase the power transmission efficiency with the first coil 10. Is appropriately set.

  The first shield part 30 is arranged on the opposite side of the facing surface of the first coil 10 that faces the second coil 20. The first shield portion 30 includes a first magnetic body 40 and a first conductor 50 disposed on the opposite side of the first magnetic body 40 from the facing surface facing the first coil 10. . That is, in the opposing direction of the first coil 10 and the second coil 20, the first coil 10, the first magnetic body 40, and the first in the direction from the second coil 20 toward the first coil 10. The conductors 50 are arranged in this order. Here, the first magnetic body 40 and the first conductor 50 do not have to be arranged in contact with each other, and a gap or an insulator may be provided therebetween.

  The first magnetic body 40 is made of a magnetic body and has an action of reducing the magnetic resistance of the magnetic path and increasing the magnetic coupling between the coils. Examples of the magnetic material include Sendust, MnZn ferrite, amorphous, and permalloy. Higher magnetic permeability and electrical resistance are preferred, and among these, MnZn ferrite is particularly preferred. The first magnetic body 40 further includes a first base 41 and a first protrusion 42 extending from the first base 41.

  The first base portion 41 extends along a direction orthogonal to the facing direction of the first coil 10 and the second coil 20. In the present embodiment, the outer contour of the first base 41 is located outside the outer contour of the first coil 10 when viewed from the facing direction of the first coil 10 and the second coil 20. .

  The first protruding portion 42 extends in a direction different from the extending direction of the first base portion 41. In other words, the first protrusion 42 has a gradient that is inclined in the direction of the first coil 10 with respect to the first base 41. Here, it is preferable to set the angle α1 formed by the first base portion 41 and the first projecting portion 42 in a range of 90 ° to 135 °. When the angle α1 is less than 90 °, a magnetic flux loop is easily formed between the first coil 10 and the first protrusion 42 as compared with the case where the angle α1 is within the above range. Transmission efficiency tends to decrease. On the other hand, when the angle α1 exceeds 135 °, an adverse effect that the coil device increases in size as the first magnetic body 40 becomes larger is more likely than in the case where the angle α1 is within the above range.

  One edge of the first protrusion 42 is connected to the outer peripheral edge of the first base 41. The other edge of the first protrusion 42 is located between the first coil 10 and the second coil 20. That is, when viewed from the first base portion 41, the other edge of the first protrusion 42 is located at a higher position (upward in the drawing) than the first coil 10. The first protrusion 42 is arranged so as to surround the first coil 10. As a result, the first coil 10 is positioned inside the space defined by the first base 41 and the first protrusion 42.

  The first conductor 50 is made of a conductor and has an action of absorbing electromagnetic waves. Examples of the conductor include aluminum, copper, and silver. The conductor may be non-magnetic, and the higher the conductivity, the better. The first conductor 50 further includes a second base 51 and a second protrusion 52 extending from the second base 51. In the present embodiment, the second base 51 and the second protrusion 52 are integrally formed.

  The second base portion 51 extends along a direction orthogonal to the facing direction of the first coil 10 and the second coil 20. In the present embodiment, the outer contour of the second base 51 is located outside the outer contour of the first coil 10 when viewed from the facing direction of the first coil 10 and the second coil 20. .

  The second protrusion 52 extends in a direction different from the extending direction of the second base 51. In other words, the second protrusion 52 has a gradient that is inclined in the direction of the first coil 10 with respect to the second base 51. Here, the angle β1 formed by the second base 51 and the second protrusion 52 is preferably the same as the angle α1 formed by the first base 41 and the first protrusion 42. By arranging the second projecting portion 52 along the extending direction of the first projecting portion 42, the magnetic flux leaking in the direction orthogonal to the opposing direction of the first coil 10 and the second coil 20 is surely obtained. This is because it can be absorbed.

  One edge of the second protrusion 52 is connected to the outer peripheral edge of the second base 51. The other edge of the second protrusion 52 is located between the first coil 10 and the second coil 20. That is, when viewed from the second base portion 51, the other edge of the second protrusion 52 is positioned higher than the first coil 10 (upward in the drawing). Further, the second protrusion 52 is arranged so as to surround the first coil 10. As a result, the first coil 10 is positioned inside the space defined by the second base 51 and the second protrusion 52.

  The second shield part 60 is disposed on the opposite side of the opposing surface of the second coil 20 that faces the first coil 10. The second shield part 60 includes a second magnetic body 70, and a second conductor 80 disposed on the opposite side of the opposing surface facing the second magnetic body 70 and the second coil 20. . That is, in the facing direction of the first coil 10 and the second coil 20, the second coil 20, the second magnetic body 70, and the second are in the direction from the first coil 10 to the second coil 20. The conductors 80 are arranged in this order. Here, the second magnetic body 70 and the second conductor 80 do not need to be disposed in contact with each other, and a gap or an insulator may be provided therebetween.

  The second magnetic body 70 is made of a magnetic body and has an action of reducing the magnetic resistance of the magnetic path and increasing the magnetic coupling between the coils. Examples of the magnetic material include Sendust, MnZn ferrite, amorphous, and permalloy. Higher magnetic permeability and electrical resistance are preferred, and among these, MnZn ferrite is particularly preferred. The second magnetic body 70 further includes a third base 71 and a third protrusion 72 extending from the third base 71.

  The third base 71 extends along a direction orthogonal to the facing direction of the first coil 10 and the second coil 20. In the present embodiment, the outer contour of the third base 71 is located outside the outer contour of the second coil 20 when viewed from the facing direction of the first coil 10 and the second coil 20. .

  The third protrusion 72 extends in a direction different from the extending direction of the third base 71. In other words, the third protrusion 72 has a gradient that is inclined in the direction of the second coil 20 with respect to the third base 71. Here, the angle α2 formed by the third base 71 and the third protrusion 72 is preferably set in the range of 90 ° to 135 °. When the angle α2 is less than 90 °, a magnetic flux loop is easily formed between the second coil 20 and the third protrusion 72 as compared with the case where the angle α2 is within the above range, and power transmission is performed. Efficiency tends to decrease. On the other hand, when the angle α2 exceeds 135 °, the coil device is likely to be enlarged as the second magnetic body 70 becomes larger as compared with the case where the angle α2 is within the above range. In addition, when the angle α1 and the angle α2 are set to be the same, the magnetic coupling between the coils is improved and good.

  One edge of the third protrusion 72 is connected to the outer peripheral edge of the third base 71. The other edge of the third protrusion 72 is located between the first coil 10 and the second coil 20. That is, when viewed from the third base 71, the other edge of the third protrusion 72 is positioned higher than the second coil 20 (downward in the drawing). The third protrusion 72 is arranged so as to surround the second coil 20. As a result, the second coil 20 is positioned inside the space defined by the third base 71 and the third protrusion 72.

  The second conductor 80 is made of a conductor and has an action of absorbing electromagnetic waves. Examples of the conductor include aluminum, copper, and silver. The conductor may be non-magnetic, and the higher the conductivity, the better. The second conductor 80 further includes a fourth base portion 81 and a fourth projecting portion 82 extending from the fourth base portion 81. In the present embodiment, the fourth base 81 and the fourth protrusion 82 are integrally formed.

  The fourth base portion 81 extends along a direction orthogonal to the facing direction of the first coil 10 and the second coil 20. In the present embodiment, when viewed from the opposing direction of the first coil 10 and the second coil 20, the outer contour of the fourth base 81 is located outside the outer contour of the second coil 20.

  The fourth protruding portion 82 extends in a direction different from the extending direction of the fourth base portion 81. In other words, the fourth protrusion 82 has a slope that is inclined in the direction of the second coil 20 with respect to the fourth base 81. Here, the angle β2 formed by the fourth base 81 and the fourth protrusion 82 is preferably the same as the angle α2 formed by the third base 71 and the third protrusion 72. By arranging the fourth projecting portion 82 along the extending direction of the third projecting portion 72, the magnetic flux leaking in the direction orthogonal to the opposing direction of the first coil 10 and the second coil 20 is surely obtained. This is because it can be absorbed.

  One edge of the fourth protrusion 82 is connected to the outer peripheral edge of the fourth base 81. The other edge of the fourth protrusion 82 is located between the first coil 10 and the second coil 20. That is, when viewed from the fourth base 81, the other edge of the fourth projecting portion 82 is positioned higher than the second coil 20 (downward in the drawing). The fourth protrusion 82 is arranged so as to surround the second coil 20. As a result, the second coil 20 is positioned inside the space defined by the fourth base 81 and the fourth protrusion 82.

  As described above, in the coil device L1 according to the present embodiment, the first magnetic body 40 and the first magnetic body are disposed on the opposite side of the first coil 10 from the facing surface facing the second coil 20. A first shield part 30 having a first conductor 50 disposed on the opposite side of the opposing surface facing the first coil 10 of 40 is provided. Here, the magnetic body has an action of reducing the magnetic resistance of the magnetic path, and the conductor has an action of absorbing magnetic flux leaking to the outside. Therefore, when the first shield part 30 has the first magnetic body 40, the magnetic resistance of the magnetic path is reduced and the coupling between the coils is increased. As a result, the power transmission efficiency between the coils can be improved, and unnecessary radiation of electromagnetic waves can be reduced. Moreover, since the magnetic flux which leaked outside is absorbed because the 1st shield part 30 has the 1st conductor 50, the unnecessary radiation of electromagnetic waves can be reduced.

  Furthermore, in the coil device L1 according to the present embodiment, the first magnetic body 40 includes a first base 41 and a first protrusion 42 extending from the first base 41, and the first conductor 50 is the first conductor 50. The second base 51 and the second protrusion 52 extending from the second base 51 are provided, and the edge of the first protrusion 42 and the edge of the second protrusion 52 are the first coil 10 and the second The coil 20 is located between the two. Therefore, the first magnetic body 40 having an action of reducing the magnetic resistance of the magnetic path includes the first protruding portion 42, and the edge of the first protruding portion 42 includes the first coil 10 and the second coil 20. Since it is extended long so as to be positioned between the magnetic paths, the magnetic resistance of the magnetic path is reduced, and the coupling between the coils is increased. As a result, the power transmission efficiency between the coils is improved, and the effect of reducing unnecessary radiation of electromagnetic waves can be improved. In addition, the first conductor 50 having an action of absorbing the magnetic flux leaked to the outside includes the second protrusion 52, and the edge of the second protrusion 52 is the first coil 10 and the second coil 20. The magnetic flux leaking in the direction orthogonal to the opposing direction of the first coil 10 and the second coil 20 is also absorbed by the second protrusion 52. Therefore, the effect of reducing unnecessary radiation of electromagnetic waves can be improved.

  In the coil apparatus L1 according to the present embodiment, the second shield unit 60 further includes a second shield part 60 on the opposite side of the second coil 20 facing the first coil 10, and the second shield part 60 includes: The second magnetic body 70 includes a second magnetic body 70, and a second conductor 80 disposed on the opposite side of the second magnetic body 70 facing the second coil 20. Includes a third base 71 and a third protrusion 72 extending from the third base 71, and the second conductor 80 includes a fourth base 81 and a fourth base 81 extending from the fourth base 81. The edge of the third protrusion 72 and the edge of the fourth protrusion 82 are located between the first coil 10 and the second coil 20. Accordingly, the second magnetic body 70 having the action of reducing the magnetic resistance of the magnetic path is provided with the third protrusion 72 on the opposite side of the second coil 20 opposite to the facing surface facing the first coil 10. Since the edge of the third protrusion 72 is extended so as to be positioned between the first coil 10 and the second coil 20, the effect of reducing the magnetic resistance of the magnetic path is increased. Thus, the coupling between the coils is further enhanced. As a result, the power transmission efficiency between the coils is improved, and the effect of reducing unnecessary radiation of electromagnetic waves can be improved. Further, on the opposite side of the second coil 20 opposite to the surface facing the first coil 10, the second conductor 80 having the function of absorbing the magnetic flux leaked to the outside includes the fourth projecting portion 82. Since the edge of the fourth protrusion 82 extends long so as to be positioned between the first coil 10 and the second coil 20, the first coil 10 and the second coil 20. This increases the absorption action of magnetic flux leaking in the direction orthogonal to the opposite direction, and can improve the effect of reducing unnecessary radiation of electromagnetic waves.

(Second Embodiment)
Next, the configuration of the second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a cross-sectional view showing a configuration of a coil device L2 according to the second embodiment of the present invention. The coil device L2 according to the second embodiment is different from the coil device L1 according to the first embodiment in that the first conductor 50 and the second conductor 80 are provided with extensions. Hereinafter, a description will be given focusing on differences from the first embodiment.

  The coil device L2 includes the first coil 10, the second coil 20, the first shield part 30, and the second shield part 60, similarly to the coil apparatus L1 of the first embodiment.

  The 1st shield part 30 is arrange | positioned on the opposite side to the opposing surface which opposes the 2nd coil 20 of the 1st coil 10 similarly to 1st Embodiment. The first shield part 30 includes a first magnetic body 40 and a first conductor 50 disposed on the opposite side of the facing surface of the first magnetic body 40 facing the first coil 10. That is, in the opposing direction of the first coil 10 and the second coil 20, the first coil 10, the first magnetic body 40, and the first in the direction from the second coil 20 toward the first coil 10. The conductors 50 are arranged in this order. However, in the present embodiment, the first conductor 50 includes a second base 51, a second protrusion 52 extending from the second base 51, and a first extension extending from the second protrusion 52. This point is different from the first embodiment.

  The first extension 53 extends in a direction different from the extending direction of the second protrusion 52. In the present embodiment, the extending directions of the first extension portion 53 and the second base portion 51 are the same.

  The 2nd shield part 60 is arrange | positioned on the opposite side to the opposing surface which opposes the 1st coil 10 of the 2nd coil 20 similarly to 1st Embodiment. The second shield part 60 includes a second magnetic body 70 and a second conductor 80 disposed on the opposite side of the second magnetic body 70 facing the second coil 20. . That is, in the facing direction of the first coil 10 and the second coil 20, the second coil 20, the second magnetic body 70, and the second are in the direction from the first coil 10 to the second coil 20. The conductors 80 are arranged in this order. However, in this embodiment, the second conductor 80 includes a fourth base 81, a fourth protrusion 82 extending from the fourth base 81, and a second extension extending from the fourth protrusion 82. This point is different from the first embodiment.

  The second extension 83 extends in a direction different from the direction in which the fourth protrusion 82 extends. In the present embodiment, the extending directions of the second extension portion 83 and the fourth base portion 81 are the same.

  As described above, in the coil device L <b> 2 according to the present embodiment, the first conductor 50 extends from the edge of the second protrusion 52 in a direction different from the extending direction of the second protrusion 52. The second conductor 80 includes a second extension portion 83 that extends in a direction different from the extending direction of the fourth protrusion portion 82 from the edge of the fourth protrusion portion 82. ing. Therefore, the first conductor 50 having an action of absorbing the magnetic flux leaking to the outside includes the first extension portion 53, so that the direction orthogonal to the facing direction of the first coil 10 and the second coil 20 is obtained. Thus, the effect of absorbing the magnetic flux leaking to the substrate increases, and the effect of reducing unnecessary radiation of electromagnetic waves can be further improved. Further, the second conductor 80 having an action of absorbing the magnetic flux leaked to the outside includes the second extension portion 83, so that the direction orthogonal to the facing direction of the first coil 10 and the second coil 20. This further increases the absorption of the magnetic flux leaking to the electromagnetic wave, and can further improve the effect of reducing unnecessary radiation of electromagnetic waves.

  The preferred embodiments of the present invention have been described above. However, the present invention is not necessarily limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. The constituent elements described include those that can be easily assumed by those skilled in the art and those that are substantially the same. Furthermore, the described constituent elements can be appropriately combined.

  DESCRIPTION OF SYMBOLS 10 ... 1st coil, 20 ... 2nd coil, 30 ... 1st shield part, 40 ... 1st magnetic body, 41 ... 1st base, 42 ... 1st protrusion part, 50 ... 1st Conductor 51 ... second base 52 ... second projection 53 ... first extension 60 ... second shield 70 ... second magnetic body 71 ... third base 72 ... third projection, 80 ... second conductor, 81 ... fourth base, 82 ... fourth projection, 83 ... second extension, α1 ... first base and first projection , Α2... Angle between the third base and the third protrusion, β1... Angle between the second base and the second protrusion, β2... Fourth base and fourth protrusion. Angle formed by the part, L1, L2 ... Coil device.

Claims (4)

  First and second coils, and a first shield part disposed on the opposite side of the first coil opposite to the facing surface facing the second coil, the first shield part comprising: , A first magnetic body, and a first conductor disposed on the opposite side of the first magnetic body facing the first coil, wherein the first magnetic body is A first base and a first protrusion extending from the first base, and the first conductor includes a second base and a second protrusion extending from the second base. And a coil device, wherein an edge of the first protrusion and an edge of the second protrusion are located between the first coil and the second coil.   The second coil further includes a second shield portion on a side opposite to the facing surface facing the first coil, the second shield portion including a second magnetic body and the second magnetic member. A second conductor disposed on the opposite side of the body opposite to the second coil, and the second magnetic body includes a third base and a third base. A third protrusion extending, the second conductor having a fourth base and a fourth protrusion extending from the fourth base, an edge of the third protrusion and 2. The coil device according to claim 1, wherein an edge of the fourth projecting portion is located between the first coil and the second coil.   The said 1st conductor is provided with the 1st extension part extended in the direction different from the extension direction of a said 2nd protrusion part from the edge part of a said 2nd protrusion part, The characterized by the above-mentioned. The coil device according to 1 or 2.   The first conductor includes a first extension extending from an edge of the second protrusion in a direction different from an extending direction of the second protrusion, and the second conductor is 3. The coil device according to claim 2, further comprising a second extension portion that extends from an edge portion of the fourth protrusion portion in a direction different from an extension direction of the fourth protrusion portion.

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