JP2022103764A - Magnetism suppression sheet and coil device with the same - Google Patents

Abstract

To provide a magnetism suppression sheet capable of suppressing emission of unwanted radiation noise.SOLUTION: A magnetism suppression sheet 1 comprises an insulating substrate 10 and a conductor pattern 20 which is provided on a surface 11 of the insulating substrate 10. The conductor pattern 20 includes: a trunk pattern 21 extending in an x direction; a plurality of branch patterns 22 extending from the trunk pattern 21 in a y direction and are arrayed in the x direction; and a terminal connection 23 connected to the trunk pattern 21. The magnetism suppression sheet 1 thus configured is disposed on a surface of a coil pattern, thereby reducing unwanted radiation noise emitted to the surroundings.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a magnetic suppression sheet and a coil device including the magnetic suppression sheet.

In recent years, a wireless power transmission system that wirelessly transmits power from a power transmission coil to a power receiving coil without using a power cable has attracted attention (see Patent Document 1). A wireless power transmission system includes a wireless power transmission device having a power transmission coil and a wireless power reception device having a power reception coil, and wireless power transmission is realized by interlinking the magnetic flux generated from the power transmission coil with the power reception coil. To.

Japanese Patent Publication No. 2020-524438

However, a part of the magnetic flux generated from the power transmission coil is radiated to the surroundings as radiation noise without interlinking with the power reception coil. Since such radiation noise causes malfunction of surrounding electronic devices, it is desirable to suppress it as much as possible.

Therefore, it is an object of the present disclosure to provide a magnetic suppression sheet capable of suppressing the radiation of unnecessary radiation noise and a coil device including the magnetic suppression sheet.

The magnetic suppression sheet according to one embodiment of the present disclosure includes an insulating base material and a conductor pattern provided on the surface of the insulating base material, and the conductor pattern includes a trunk line pattern extending in the first direction. It is characterized in that it branches from the trunk line pattern in a second direction different from the first direction, and includes a plurality of branch line patterns arranged in the first direction and a terminal connection portion connected to the trunk line pattern. ..

As described above, according to the present disclosure, it is possible to provide a magnetic suppression sheet capable of suppressing the radiation of unnecessary radiation noise and a coil device including the magnetic suppression sheet.

FIG. 1 is a schematic plan view for explaining the structure of the magnetic suppression sheet 1 according to the embodiment of the present disclosure. FIG. 2 is an enlarged view of the region A shown in FIG. FIG. 3 is a schematic cross-sectional view taken along the line BB shown in FIG. FIG. 4 is a schematic cross-sectional view showing an example in which the thickness of the branch line pattern 22 is not constant. FIG. 5 is a block diagram showing a configuration of a wireless power transmission system 100 using the magnetic suppression sheet 1. FIG. 6 is a schematic cross-sectional view for explaining the positional relationship between the magnetic suppression sheet 1 and the power transmission coil 2. FIG. 7 is a table showing the measurement results of the examples.

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

FIG. 1 is a schematic plan view for explaining the structure of the magnetic suppression sheet 1 according to the embodiment of the present disclosure. 2 is an enlarged view of the region A shown in FIG. 1, and FIG. 3 is a schematic cross-sectional view taken along the line BB shown in FIG.

As shown in FIGS. 1 to 3, the magnetic suppression sheet 1 according to the present embodiment is composed of an insulating base material 10 and a conductor pattern 20 provided on the surface 11 of the insulating base material 10. The material of the insulating base material 10 is not particularly limited, but it is preferable to use a flexible material such as a PET film rather than a rigid material used for PCB. The thickness T of the insulating base material 10 is preferably as thin as possible as long as the mechanical strength is ensured. As an example, when a PET film is used as the material of the insulating base material 10, the thickness T thereof can be about 20 μm. The conductor pattern 20 is not provided on the back surface 12 of the insulating base material 10.

The conductor pattern 20 is made of a good conductor such as copper (Cu), and has a trunk line pattern 21 extending in the x direction, a plurality of branch line patterns 22 extending in the y direction, a terminal connection portion 23, and a trunk line pattern 21. It includes a plurality of connection patterns 24 for connecting the terminal connection unit 23. A fixed potential such as a ground potential is given to these conductor patterns 20 via the terminal connection portion 23. The trunk line pattern 21 has sides 21a and 21b extending in the x direction and located on opposite sides to each other. The plurality of branch line patterns 22 branch from the side 21a of the trunk line pattern 21 and extend in the y direction, and are arranged in the x direction. In the present embodiment, the extending direction of the trunk line pattern 21 and the extending direction of the branch line pattern 22 are orthogonal to each other, but this point is not essential in the present disclosure. Further, the number of branch line patterns 22 is not particularly limited. The x direction is an example of the first direction, and the y direction is an example of the second direction. Further, the side 21a is an example of the first side, and the side 21b is an example of the second side.

The plurality of branch line patterns 22 are connected to the trunk line pattern 21 at one end in the y direction, and the tip portion located at the other end in the y direction is open. Further, the branch line patterns 22 are also connected to each other via the trunk line pattern 21, and are also provided independently without being directly connected. Therefore, when a magnetic field in the z direction is applied to the magnetic suppression sheet 1, a part of the magnetic field is applied to the branch line pattern 22 to generate an eddy current, but the branch line pattern 22 has a loop-shaped pattern. Since it is not configured, there is no loss due to a large loop of the current generated by the magnetic field.

The width of the trunk line pattern 21 in the y direction is W1, and the width of the branch line pattern 22 in the x direction is W2. Further, the interval in the x direction of the branch line pattern 22 adjacent to the x direction is S. Further, the thickness of the branch line pattern 22 is H. The thickness H of the branch line pattern 22 is about 3 to 35 μm. The thickness of the conductor pattern 20 including the branch line pattern 22 may be substantially constant as a whole, or the thickness of the conductor pattern 20 may differ depending on the plane position. As an example, as shown in FIG. 4, the thickness H2 of the branch line pattern 22 at the tip portion away from the trunk line pattern 21 is thinner than the thickness H1 of the branch line pattern 22 at the portion connected to the trunk line pattern 21. It doesn't matter. According to this, even if the branch line pattern 22 is designed to be thin, it is possible to reduce the connection resistance to the trunk line pattern 21. As described above, it is preferable that the thickness T of the insulating base material 10 is sufficiently thin and thinner than the thickness H of the branch line pattern 22. Further, the width W2 of the branch line pattern 22 may be larger than the thickness H of the branch line pattern 22. According to this, since the branch line pattern 22 is not too thin and not too thick, the branch line pattern 22 can be easily produced. In the example shown in FIG. 4, the branch line pattern 22 gradually becomes thinner from the portion connected to the trunk line pattern 21 toward the tip portion away from the trunk line pattern 21.

In the present embodiment, the interval S of the branch line pattern 22 is designed to be larger than the width W2 of the branch line pattern 22. That is, S> W2. This is because the magnetic flux easily passes between the branch line patterns 22 by sufficiently securing the interval S of the branch line patterns 22. In particular, the interval S of the branch line pattern 22 is preferably 7 times or more and 13 times or less the width W2 of the branch line pattern 22. That is, it is preferable to satisfy W2 × 13 ≧ S ≧ W2 × 7. This is because the magnetic flux easily passes between the branch line patterns 22 by making the interval S of the branch line pattern 22 7 times or more the width W2 of the branch line pattern 22. This is because the shielding effect of radiation noise can be sufficiently obtained by setting the interval S to 13 times or less the width W2 of the branch line pattern 22. As an example, the width W2 of the branch line pattern 22 can be set to about 0.1 to 0.2 mm, and the interval S of the branch line pattern 22 can be set to about 0.1 to 1 mm. Further, the width W2 of the branch line pattern 22 is preferably larger than the thickness H of the branch line pattern 22.

The width W1 of the trunk line pattern 21 is, for example, about 0.1 to 5 mm, and is preferably larger than the width W2 of the branch line pattern 22. This is because the potential of the branch line pattern 22 becomes more stable by increasing the width W1 of the trunk line pattern 21 connected to a large number of branch line patterns 22. However, if the width W1 of the trunk line pattern 21 is too wide, it becomes difficult for the magnetic flux to pass through. Therefore, the width W1 of the trunk line pattern 21 is preferably smaller than the interval S of the branch line pattern 22. As an example, if the width W2 of the branch line pattern 22 is 0.1 mm and the interval S of the branch line patterns 22 is 0.9 mm, the width W1 of the trunk line pattern 21 can be about 0.2 mm. As described above, the difference between the width W1 of the trunk line pattern 21 and the width W2 of the branch line pattern 22 is preferably smaller than the difference between the width W1 of the trunk line pattern 21 and the interval S of the branch line pattern 22.

As shown in FIG. 1, the terminal connection portion 23 is connected to the side 21b of the trunk line pattern 21 via a plurality of connection patterns 24. The connection position of the terminal connection portion 23 is near the end portion of the trunk line pattern 21, and is offset in the x direction. This makes it possible to reduce the interference between the terminal connection portion 23 and the magnetic flux. Further, since the terminal connection portion 23 is not directly connected to the trunk line pattern 21, but is connected via a plurality of connection patterns 24 extending in the y direction and arranged in the x direction, the terminal connection portion 23 is connected. The magnetic flux easily passes in the vicinity of.

FIG. 5 is a block diagram showing a configuration of a wireless power transmission system 100 using the magnetic suppression sheet 1.

The wireless power transmission system 100 shown in FIG. 5 includes a transmission coil 2 and a power receiving coil 3, a transmission circuit 4 for passing an alternating current through the transmission coil 2, and a power receiving circuit 5 for receiving the alternating current flowing through the power receiving coil 3. , The magnetic suppression sheet 1 is arranged between the power transmitting coil 2 and the power receiving coil 3. DC power is supplied to the power transmission circuit 4 via the power supply circuit 6. The DC power output from the power receiving circuit 5 is supplied to the load circuit 7. As a result, a wireless power transmission system is configured, the power transmission coil 2 and the power transmission circuit 4 form a wireless power transmission device, and the power receiving coil 3 and the power receiving circuit 5 form a wireless power receiving device.

When an alternating current flows through the power transmission coil 2, a magnetic flux φ is generated from the power transmission coil 2. Most of this magnetic flux φ is interlinking with the power receiving coil 3, whereby an alternating current flows through the power receiving coil 3. However, a part of the magnetic flux φ generated from the power transmission coil 2 is radiated to the surroundings as radiation noise without interlinking with the power receiving coil 3. Since such radiation noise may cause malfunction of surrounding electronic devices, it is desirable to suppress it as much as possible. The magnetic flux suppression sheet 1 according to the present embodiment reduces such radiation noise, and by arranging the magnetic flux suppression sheet 1 between the power transmission coil 2 and the power reception coil 3 in the vicinity of the power transmission coil 2, the power reception coil 3 and the power reception coil 3 It is possible to shield a large amount of radiation noise while ensuring the interlinking magnetic flux φ. As described above, the magnetic suppression sheet 1 according to the present embodiment can be used in a wireless power transmission system.

FIG. 6 is a schematic cross-sectional view for explaining the positional relationship between the magnetic suppression sheet 1 and the power transmission coil 2.

As shown in FIG. 6, the power transmission coil 2 includes an insulating base material 30 made of a PET film or the like, and coil patterns 41 and 42 formed on the front surface 31 and the back surface 32 of the insulating base material 30, respectively. The coil patterns 41 and 42 form a coil conductor by being connected in series or in parallel. The surface of the coil pattern 41 formed on the surface 31 of the insulating base material 30 constitutes the coil radiation surface 2a of the power transmission coil 2. The front surface of the coil pattern 42 formed on the back surface 32 of the insulating base material 30 constitutes the coil back surface 2b of the power transmission coil 2. Then, the magnetic suppression sheet 1 is arranged so as to face the coil radiating surface 2a, and the magnetic material sheet 8 is arranged so as to face the coil back surface 2b. Although there is no structural difference between the coil radiation surface 2a and the coil back surface 2b, the side facing the magnetic suppression sheet 1 is defined as the coil radiation surface 2a, and the side facing the magnetic material sheet 8 is defined as the coil back surface 2b. The coil radiation surface 2a is an example of the coil surface. The power transmission coil 2, the magnetic suppression sheet 1, and the magnetic material sheet 8 constitute a coil device.

The back surface 12 of the insulating base material 10 constituting the magnetic suppression sheet 1 is laminated on the coil radial surface 2a of the power transmission coil 2 via a resist 51 having an insulating property. The resist 51 is an insulating member provided to prevent conductive foreign matter from adhering to the surface of the coil pattern 41. As a result, the resist 51 and the insulating base material 10 are interposed between the coil pattern 41 and the conductor pattern 20. The distance from the coil radial surface 2a to the surface of the conductor pattern 20, that is, the total thickness of the resist 51 and the insulating base material 10 is L1.

The coil back surface 2b of the power transmission coil 2 is adhered to the magnetic material sheet 8 via the adhesive sheet 52 having an insulating property. The distance from the coil radial surface 2a to the surface of the magnetic sheet 8, that is, the total thickness of the coil patterns 41 and 42, the insulating base material 30, and the adhesive sheet 52 is L2. Here, the distance L1 from the coil radiating surface 2a to the surface of the conductor pattern 20 is preferably the distance L2 or less from the coil radiating surface 2a to the surface of the magnetic material sheet 8, and is preferably half or less of the distance L2. More preferred. This is because unnecessary radiation noise can be more effectively shielded by shortening the distance L1 as much as possible. In particular, the distance L1 is preferably equal to or less than the interval S of the branch line pattern 22. According to this, it is possible to more effectively shield unnecessary radiation noise while sufficiently securing the Q value of the power transmission coil 2.

Further, in order to more effectively shield unnecessary radiation noise, it is preferable that the outer diameter size D1 of the conductor pattern 20 provided on the magnetic suppression sheet 1 is larger than the outer diameter size D2 of the power transmission coil 2 in a plan view. It is preferable that the entire power transmission coil 2 is covered with the forming region of the conductor pattern 20. In this way, by covering the entire power transmission coil 2 with the forming region of the conductor pattern 20, it is possible to more effectively shield unnecessary radiation noise.

Further, in addition to arranging the magnetic suppression sheet 1 in the vicinity of the power transmission coil 2, or instead of arranging the magnetic suppression sheet 1 in the vicinity of the power transmission coil 2, the magnetic suppression sheet 1 is placed in the vicinity of the power receiving coil 3. You may place it. In this case, the power receiving coil 3, the magnetic suppression sheet 1 and the magnetic material sheet 8 constitute a coil device.

As described above, if the magnetic suppression sheet 1 according to the present embodiment is arranged between the power transmission coil 2 and the power reception coil 3, the Q value of the power transmission coil 2 is sufficiently secured and unnecessary radiation is radiated to the surroundings. It is possible to reduce noise.

Although the preferred embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and various changes can be made without departing from the gist of the present disclosure, and these are also disclosed in the present disclosure. Needless to say, it is included in the range.

The techniques according to the present disclosure include, but are not limited to, the following configuration examples.

The magnetic suppression sheet according to one embodiment of the present disclosure includes an insulating base material and a conductor pattern provided on the surface of the insulating base material, and the conductor pattern is a trunk line pattern extending in a first direction. A plurality of branch line patterns extending from the main line pattern in a second direction different from the first direction and arranged in the first direction, and a terminal connection portion connected to the main line pattern. It is characterized by including.

In the magnetic suppression sheet, by arranging the magnetic suppression sheet on the surface of the coil pattern that generates a magnetic field, it is possible to reduce unnecessary radiation noise radiated to the surroundings.

Further, the interval of the branch line pattern adjacent to the first direction may be larger than the width of the branch line pattern in the first direction. According to this, the decrease in the Q value of the coil due to the arrangement of the magnetic suppression sheet can be suppressed. In this case, the interval may be 7 times or more and 13 times or less the width. According to this, it is possible to sufficiently secure the effect of reducing radiation noise while effectively suppressing the decrease in the Q value.

Further, the width of the trunk line pattern in the second direction is smaller than the interval of the branch line patterns adjacent to the first direction, and larger than the width of the branch line pattern in the first direction. It doesn't matter. According to this, it is possible to sufficiently secure the effect of reducing radiation noise while effectively suppressing the decrease in the Q value. In this case, the difference between the width of the trunk line pattern in the second direction and the width of the branch line pattern in the first direction is the width of the trunk line pattern in the second direction and the width in the first direction. It may be smaller than the difference from the spacing of the adjacent branch line patterns. According to this, it is possible to more effectively suppress the decrease in the Q value.

Further, the width of the branch line pattern in the first direction may be larger than the thickness of the branch line pattern. This facilitates the production of the branch line pattern.

Further, the thickness of the branch line pattern may be larger than the thickness of the insulating base material. This makes it possible to bring the branch line pattern closer to the coil pattern.

Further, the branch line pattern may have a thinner tip portion away from the trunk line pattern than the thickness of the portion connected to the trunk line pattern. According to this, it is possible to reduce the connection resistance between the branch line pattern and the trunk line pattern.

Further, the conductor pattern may be made of copper. This makes it possible to effectively reduce unnecessary radiation noise.

Further, the trunk line pattern has first and second sides extending in the first direction and located on opposite sides to each other, and the plurality of branch line patterns are connected to the first side of the trunk line pattern. The terminal connection portion may be connected to the second side of the trunk line pattern and may be arranged offset in the first direction. According to this, it is possible to suppress the decrease in the Q value caused by the terminal connection portion. In this case, the conductor pattern may be arranged in the first direction and may further include a plurality of connection patterns connecting the second side of the trunk line pattern and the terminal connection portion. According to this, it is possible to suppress the decrease in the Q value due to the connection pattern connecting the trunk line pattern and the terminal connection portion.

Further, the coil device according to the embodiment of the present disclosure is arranged between the magnetic suppression sheet, the magnetic material sheet, the magnetic suppression sheet and the magnetic material sheet, and has a coil surface facing the magnetic suppression sheet. It is characterized by having a coil pattern.

According to the coil device, it is possible to reduce unnecessary radiation noise radiated from the coil pattern to the surroundings.

Further, the distance from the coil surface to the surface of the conductor pattern may be less than or equal to the distance from the coil surface to the surface of the magnetic material sheet. According to this, it is possible to enhance the effect of reducing radiation noise. In this case, the distance from the coil surface to the surface of the conductor pattern may be less than half the distance from the coil surface to the surface of the magnetic sheet. According to this, it is possible to further enhance the effect of reducing radiation noise.

Further, the distance from the coil surface to the surface of the conductor pattern may be less than or equal to the distance between the branch line patterns adjacent to the first direction. According to this, it is possible to further enhance the effect of reducing radiation noise.

Further, the outer size of the conductor pattern may be larger than the outer size of the coil pattern. According to this, it is possible to further enhance the effect of reducing radiation noise.

Further, the insulating base material of the magnetic suppression sheet may be laminated on the coil surface of the coil pattern via an insulating member. This makes it possible to shorten the distance between the magnetic suppression sheet and the coil pattern.

A plurality of samples A0 to A7 having the same structure as the magnetic suppression sheet 1 shown in FIG. 1 were actually prepared. Then, in a state where these samples were superposed on the coil pattern, the resistance value and the Q value of the coil pattern obtained when an alternating current was passed through the coil pattern were measured. A flexible PET film having a thickness of 20 μm was used as the insulating base material 10 of the samples A1 to A7, and a rigid PCB substrate having a thickness of 1000 μm was used as the insulating base material 10 of the samples A0. As the conductor pattern 20, a copper pattern having a thickness of 35 μm was used for all of the samples A0 to A7. The DC resistance of the coil pattern was designed to be 0.123Ω, and the inductance at 100kHz was designed to be 1.05 × ^10-5H .

The measurement results are shown in FIG. The width W1 of the trunk line pattern 21, the width W2 of the branch line pattern 22, the interval S of the branch line patterns 22, and the number of branch line patterns 22 in each sample are as shown in FIG. Further, FIG. 7 also shows the result when the magnetic suppression sheet 1 is not used. The “Q value ratio” shown in FIG. 7 is a relative value when the Q value when the magnetic suppression sheet 1 is not used is 100%.

The samples A1 and A2 have W1 = 0.2 mm and W2 = 0.2 mm, and the intervals S of the branch line patterns 22 are different from each other. In this case, a higher Q value was obtained for the sample A2 having the interval S of 0.8 mm than for the sample A1 having the interval S of 0.6 mm. Further, in sample A0, the insulating base material 10 of sample A1 was changed from a PET film to a PCB substrate, and the Q value ratio was 77.0%. It is considered that this is because the thickness of the PCB substrate is large and the distance between the coil pattern and the conductor pattern 20 is large. The sample A6 had the same structure as the sample A1 except that W1 = 1 mm, and the Q value was slightly lower than that of the sample A1.

In the samples A3 to A5, W1 = 0.2 mm and W2 = 0.1 mm, and the intervals S of the branch line patterns 22 are different from each other. Samples A3 to A5 generally had higher Q values than samples A1 and A2, but samples A3 and A3 had an interval S of 0.7 mm or 0.9 mm as compared with sample A5 having an interval S of 0.4. A higher Q value was obtained for A4. As described above, the difference (W1-W2) between the width W1 of the trunk line pattern 21 and the width W2 of the branch line pattern 22 is from the difference (S-W1) between the width W1 of the trunk line pattern 21 and the interval S of the branch line pattern 22. In the small sample, a Q value ratio close to 100% was obtained. The sample A7 had the same structure as the sample A3 except that W1 = 1 mm, and the Q value was slightly lower than that of the sample A3.

1 Magnetic suppression sheet 2 Transmission coil 2a Coil radiation surface 2b Coil back surface 3 Power receiving coil 4 Transmission circuit 5 Power receiving circuit 6 Power supply circuit 7 Load circuit 8 Magnetic material sheet 10 Insulating base material 11 Insulating base material surface 12 Insulating base material Back side 20 Conductor pattern 21 Trunk line pattern 21a, 21b Trunk line pattern side 22 Branch line pattern 23 Terminal connection part 24 Connection pattern 30 Insulation base material 31 Insulation base material front side 32 Insulation base material back side 41, 42 Coil pattern 51 Resist 52 Adhesive sheet 100 Wireless power transmission system φ magnetic flux

Claims (17)

Insulating base material and
With a conductor pattern provided on the surface of the insulating substrate,
The conductor pattern has a trunk line pattern extending in the first direction and a plurality of branches extending from the trunk line pattern in a second direction different from the first direction and arranged in the first direction. A magnetic suppression sheet comprising a line pattern and a terminal connection portion connected to the trunk line pattern. The magnetic suppression sheet according to claim 1, wherein the distance between the branch line patterns adjacent to the first direction is larger than the width of the branch line pattern in the first direction. The magnetic suppression sheet according to claim 2, wherein the interval is 7 times or more and 13 times or less the width. The width of the trunk line pattern in the second direction is smaller than the spacing of the branch line patterns adjacent to the first direction and larger than the width of the branch line pattern in the first direction. The magnetic suppression sheet according to any one of claims 1 to 3, which is characterized. The difference between the width of the trunk line pattern in the second direction and the width of the branch line pattern in the first direction is the width of the trunk line pattern in the second direction and the width adjacent to the first direction. The magnetic suppression sheet according to claim 4, wherein the difference from the interval of the branch line pattern is smaller. The magnetic suppression sheet according to any one of claims 1 to 5, wherein the width of the branch line pattern in the first direction is larger than the thickness of the branch line pattern. The magnetic suppression sheet according to any one of claims 1 to 6, wherein the thickness of the branch line pattern is larger than the thickness of the insulating base material. The aspect according to any one of claims 1 to 7, wherein the branch line pattern is thinner at the tip portion away from the trunk line pattern than at the thickness of the portion connected to the trunk line pattern. Magnetic suppression sheet. The magnetic suppression sheet according to any one of claims 1 to 8, wherein the conductor pattern is made of copper. The trunk pattern has first and second sides extending in the first direction and located on opposite sides of each other.
The plurality of branch line patterns are connected to the first side of the trunk line pattern.
The terminal connection portion according to any one of claims 1 to 9, wherein the terminal connection portion is connected to the second side of the trunk line pattern and is arranged offset in the first direction. The magnetic suppression sheet described. 10. The magnetism according to claim 10, wherein the conductor pattern is arranged in the first direction and further includes a plurality of connection patterns connecting the second side of the trunk line pattern and the terminal connection portion. Suppression sheet. The magnetic suppression sheet according to any one of claims 1 to 11.
With a magnetic sheet,
A coil device comprising: a coil pattern arranged between the magnetic suppression sheet and the magnetic suppression sheet and having a coil surface facing the magnetic suppression sheet. The coil device according to claim 12, wherein the distance from the coil surface to the surface of the conductor pattern is equal to or less than the distance from the coil surface to the surface of the magnetic material sheet. 13. The coil device according to claim 13, wherein the distance from the coil surface to the surface of the conductor pattern is less than half the distance from the coil surface to the surface of the magnetic material sheet. The coil according to any one of claims 12 to 14, wherein the distance from the coil surface to the surface of the conductor pattern is equal to or less than the distance between the branch line patterns adjacent to the first direction. Device. The coil device according to any one of claims 12 to 15, wherein the outer size of the conductor pattern is larger than the outer size of the coil pattern. The coil device according to any one of claims 12 to 16, wherein the insulating base material of the magnetic suppression sheet is laminated on the coil surface of the coil pattern via an insulating member. ..

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