JP5964163B2 - Antenna device - Google Patents

Description

  The present invention relates to an antenna device provided in a portable electronic device, and more particularly to an antenna device for RFID (Radio Frequency Identification) or NFC (Near Field Communication).

  Examples of this type of antenna device include those disclosed in Patent Document 1 or Patent Document 2. Each antenna device includes a conductor plate and a coil. In the conductor plate of Patent Document 1, an opening and a slit that connects the opening and the outer edge of the conductor plate are formed. The coil of Patent Document 1 is arranged such that the region surrounded by the coil overlaps with the inside of the opening when viewed from a direction orthogonal to the main surface of the conductor plate. The conductor plate of Patent Document 2 has a notch. The coil of Patent Document 1 is arranged so that the region surrounded by the coil overlaps the inside of the notch when viewed from a direction orthogonal to the main surface of the conductor plate.

Japanese Patent No. 4687832 JP 2011-199343 A

  An object of this invention is to provide the antenna apparatus which has a structure which can achieve the further improvement of a communication characteristic.

  As a result of research, the inventors of the present invention have found that the opening separated from the outer edge of the conductor plate (not the open edge connected to the outer edge and the slit as in Patent Document 1, but the edge of the opening itself forms a closed loop. It is found that the communication distance can be increased by providing a magnetic material extending from the outside of the closed loop edge, which is a closed circuit composed of the outer edges of the conductor plate, to the inside of the opening. It was. Similarly, when it has a slit and the opening part (additional opening part) connected with the outer edge by the slit like patent document 1, (In this case, the outer edge of a conductor board, the edge of a slit, and an additional opening) A closed loop edge that is a closed circuit is formed by the edge of the portion), or when there is a recess as in Patent Document 2 (in this case, a closed loop edge that is a closed circuit is formed by the outer edge of the conductor plate and the edge of the recessed portion) It is confirmed that the communication distance can be increased by providing the conductor plate with an opening that can form a closed loop as described above and a magnetic body extending from the outside of the closed loop edge to the inside of the opening. did. The present invention has been made on the basis of such knowledge, and has a specific configuration as described below.

The present invention provides a first antenna device as
A conductive plate having a first main surface and a second main surface which is the back surface of the first main surface and an outer edge, and is separated from the closed loop edge and the closed loop edge, which are a closed circuit composed of the outer edge or an edge including the outer edge. A conductive plate comprising a plurality of openings,
A magnetic body provided to extend from the outside of the closed loop edge to the inside of the opening when viewed along a direction orthogonal to the second main surface of the conductor plate;
An antenna device comprising a coil,
When the coil is viewed along a direction orthogonal to the second main surface of the conductor plate, the region surrounded by the coil and the outside of the closed loop edge of the conductor plate at least partially overlap each other. And an antenna device arranged so that the region surrounded by the coil and the opening of the conductor plate do not overlap.

Moreover, this invention is a 1st antenna apparatus as a 2nd antenna apparatus,
The conductor plate has a recess recessed from the outer edge toward the opening,
The edge constituting the recess constitutes the closed loop edge together with the outer edge,
The coil is arranged such that the region in the recess and the region surrounded by the coil at least partially overlap when viewed along a direction orthogonal to the second main surface of the conductor plate. An antenna device is provided.

Moreover, this invention is a 1st antenna apparatus as a 3rd antenna apparatus,
In the conductor plate, an additional opening connected to the outer edge by a slit is formed,
Both edges of the slit and the edge constituting the additional opening constitute the closed loop edge together with the outer edge,
When the coil is viewed along a direction orthogonal to the second main surface of the conductor plate, the region in the additional opening and the region surrounded by the coil overlap at least partially. An antenna device is provided.

Further, the present invention is any one of the first to third antenna devices as the fourth antenna device,
The coil provides an antenna device that is disposed so as not to overlap the conductor plate when viewed along a direction orthogonal to the second main surface of the conductor plate.

Further, the present invention is any one of the first to third antenna devices as the fifth antenna device,
The coil provides an antenna device that is at least partially sandwiched between the second main surface of the conductor plate and the magnetic body.

Moreover, this invention is a 1st antenna apparatus as a 6th antenna apparatus,
The antenna device further includes an additional conductor plate,
The conductor plate and the additional conductor plate are arranged to form a window or a gap when viewed along a direction orthogonal to the second main surface of the conductor plate,
The coil is disposed such that the window or gap and a region surrounded by the coil overlap at least partially when viewed along a direction orthogonal to the second main surface of the conductor plate. An antenna device is provided.

Further, the present invention is any one of the first to sixth antenna devices as the seventh antenna device,
When viewed along a direction orthogonal to the second main surface of the conductor plate, the magnetic body provides an antenna device that partially overlaps a region surrounded by the coil.

Moreover, this invention is a 7th antenna apparatus as an 8th antenna apparatus,
The magnetic body provides an antenna device that extends to or penetrates at least one or both of a region surrounded by the coil and the opening of the conductor plate.

Furthermore, the present invention provides a ninth antenna device,
A conductive plate having a first main surface and a second main surface which is the back surface of the first main surface and an outer edge, and is separated from the closed loop edge and the closed loop edge, which are a closed circuit composed of the outer edge or an edge including the outer edge. A conductive plate comprising a plurality of openings,
Coils,
A magnetic body provided so as to extend from the outside of the closed loop edge to the inside of the opening when viewed along a direction orthogonal to the second main surface of the conductor plate through a region surrounded by the coil. An antenna device is provided.

Moreover, this invention is a 9th antenna apparatus as a 10th antenna apparatus,
The coil provides an antenna device that is formed by bending a planar coil so that a cross section in a plane orthogonal to the second main surface has an angular J shape.

Moreover, this invention is a 9th antenna apparatus as an 11th antenna apparatus,
The coil provides an antenna device constituting a bar antenna wound with the magnetic body as a magnetic core.

Further, the present invention is any one of the first to eleventh antenna devices as the twelfth antenna device,
The antenna device communicates with a transmission coil on the other side,
The transmitting coil is provided on the first main surface side, and the coil is provided on the second main surface side.

Further, the present invention is any one of the first to twelfth antenna devices as the thirteenth antenna device,
The antenna device further includes a shield plate,
The magnetic body provides an antenna device located at least partially between the second main surface of the conductor plate and the shield plate.

  According to the present invention, a magnetic body is provided so that an opening that forms a closed loop separated from the outer edge of the conductor plate is provided in the conductor plate, and extends from the outside of the closed loop edge, which is a closed path including an edge including the outer edge, to the inside of the opening. Furthermore, by providing a coil in the magnetic path formed by the magnetic material or in the vicinity thereof, the distribution of the magnetic field can be expanded and the communication range can be expanded.

It is a top view which shows the antenna apparatus by embodiment of this invention. FIG. 2 is a partially transmissive top view showing the antenna device of FIG. 1. It is a bottom view which shows the antenna apparatus of FIG. FIG. 4 is a cross-sectional view showing the antenna device of FIG. 2 along the line IV--IV. It is a top view which shows the antenna apparatus by a 1st modification. It is a figure which shows typically the cross section along the VI--VI line of the antenna apparatus of FIG. It is a top view which shows the antenna apparatus by a 2nd modification. It is a figure which shows typically the cross section along the VIII--VIII line of the antenna apparatus of FIG. It is a top view which shows the antenna apparatus by a 3rd modification. It is a figure which shows typically the cross section along the XX line of the antenna apparatus of FIG. It is a bottom view which shows the antenna apparatus by the 4th modification. It is a bottom perspective view showing an antenna device according to a fifth modification. It is a top view which shows the antenna apparatus by the 6th modification. It is sectional drawing which shows the antenna apparatus of FIG. 13 along the XIV--XIV line. It is a top view which shows the antenna apparatus by the 7th modification. It is a top view which shows the antenna apparatus by the 8th modification. It is a top view which shows the conductor plate of the antenna apparatus by a 9th modification. It is a top view which shows the conductor plate of the antenna apparatus by a 10th modification. It is a top view which shows the conductor plate and coil of an antenna apparatus by an 11th modification. It is a top view which shows the conductor plate of the antenna apparatus by a 12th modification, and an additional conductor plate. It is a top view which shows the conductor plate of the antenna apparatus by a 13th modification, and an additional conductor plate. It is a bottom perspective view showing an antenna device according to a fourteenth modification. FIG. 23 is a partially transparent perspective view showing the antenna device of FIG. 22. It is a bottom perspective view showing an antenna device according to a fifteenth modification. It is a figure which shows the effect of the antenna apparatus by a 1st Example. It is a graph which shows the effect of the antenna device by the 1st example.

  1 to 4, the antenna device 10 according to the embodiment of the present invention includes a conductor plate 20, a magnetic body 60, and a coil 80.

  The conductor plate 20 according to the present embodiment includes a first main surface 22 disposed toward the transmitter (transmitting coil 100) side, a second main surface 24 that is the back surface of the first main surface 22, and an outer edge (that is, , Edges constituting the outer periphery of the conductor plate 20). The conductor plate 20 is formed with an opening 40 that passes between the first main surface 22 and the second main surface 24 and a recess 32 that is recessed inward from the outer edge 26. In the present embodiment, the outer edge 26 and the edge (edge) constituting the recess 32 constitute a closed loop edge 30 that is a closed circuit. The opening 40 is separated from the closed loop edge 30. That is, the edge (edge) which comprises the opening part 40 is closed, and has comprised the closed loop.

  The magnetic body 60 according to the present embodiment is made of a soft magnetic body, and includes an upper portion 62 positioned above the first main surface 22, a lower portion 64 positioned below the second main surface 24, and the opening 40. And a connecting portion 68 that passes through the recess 32 and connects the upper portion 62 and the lower portion 64 to each other. That is, the magnetic body 60 forms a closed magnetic circuit. The upper part 62 and the lower part 64, when viewed along the direction orthogonal to the first main surface 22 and the second main surface 24, from the inside of the recess 32 (that is, the outside of the closed loop edge 30) to the inside of the opening 40. It extends to. As a material of the magnetic body 60, for example, a magnetic sheet, a ferrite sheet, a ferrite sintered body, or the like can be used.

  The coil 80 according to the present embodiment is partially sandwiched between the magnetic body 60 and the second main surface 24 of the conductor plate 20. In addition, when the coil 80 according to the present embodiment is viewed along the direction orthogonal to the second main surface 24 of the conductor plate 20, the region in the recess 32 and the region surrounded by the coil 80 are partially formed. It is arranged so that it overlaps. That is, the coil 80 is arranged so that the region surrounded by the coil 80 and the outside of the closed loop edge 30 partially overlap when viewed along a direction orthogonal to the second main surface 24 of the conductor plate 20. Has been. The region in the recess 32 and the region surrounded by the coil 80 may completely overlap, or the region surrounded by the coil 80 and the outside of the closed loop edge 30 may completely overlap. Further, the coil 80 is arranged so that the region surrounded by the coil 80 and the opening 40 of the conductor plate 20 do not overlap when viewed along a direction orthogonal to the second main surface 24 of the conductor plate 20. ing. The coil 80 according to the present embodiment is a so-called planar coil, and includes, for example, an FPC form, a pattern form formed on a substrate, windings, and the like.

  As is apparent from FIGS. 1 to 4, the magnetic body 60 and the coil 80 in the present embodiment are the same as those of the magnetic body 60 when viewed along the direction orthogonal to the second main surface 24 of the conductor plate 20. The upper part 62 and the lower part 64 are arranged so as to partially overlap the area surrounded by the coil 80. In addition, the magnetic body 60 and the coil 80 are arranged so that the connecting portion 68 penetrates the region surrounded by the coil 80.

  According to the antenna device 10 having such a structure, not only when the region surrounded by the transmission coil 100 serving as a communication partner and the region surrounded by the coil 80 are arranged to overlap, the communication partner Even when the region surrounded by the transmitting coil 100 on the side and the opening 40 of the conductor plate 20 overlap each other, a good communication distance can be obtained. That is, according to the present embodiment, it is possible to obtain an effect of extending the communication range.

  Various modifications and applications can be made to the above-described embodiment. For example, in the above-described embodiment, the opening 40 has a rectangular shape, but may have a round shape or an arbitrary shape.

  In the embodiment described above, only one opening 40 is provided, but a plurality of openings 40 may be provided. For example, the opening 40 in each embodiment may be divided into two or more by a beam portion extending in the left-right direction on the paper surface or the vertical direction on the paper surface.

  Moreover, in embodiment mentioned above, it arrange | positions so that the opening part may overlap with the conductor board 20 in this Embodiment, and the other conductor board which has the opening part similar to the opening part 40 may be piled up. It is also good.

  In the above-described embodiment, the conductor plate 20 has a certain thickness. However, the conductor plate 20 is thinned by reducing the thickness of the portion where the coil 80 and the magnetic body 60 are disposed. The coil 80 and the magnetic body 60 may be accommodated in the portion. If comprised in this way, the whole antenna apparatus 10 can be made thin.

  In the embodiment described above, the coil 80 is disposed on the second main surface 24 side of the conductor plate 20, but may be disposed on the first main surface 22 side.

  Other typical modifications will be briefly described below with reference to the drawings.

(First modification)
In the above-described embodiment, the magnetic body 60 has a closed-loop cross-section that forms a closed magnetic circuit. However, as in the first modification shown in FIGS. 5 and 6, the antenna device 10 a is square. Alternatively, a magnetic body 60a having a U-shaped cross section (that is, a magnetic body 60a that does not itself constitute a closed magnetic path) may be provided.

  Specifically, the magnetic body 60 a includes a lower portion 64 positioned below the second main surface 24, a first column portion 70 extending from the lower portion 64 into the opening 40, and a region surrounded by the coil 80 from the lower portion 64. And a second pillar portion 72 that extends. The lower portion 64 extends from the inside of the recess 32 (that is, the outside of the closed loop edge 30) to the inside of the opening 40 when viewed along a direction orthogonal to the second main surface 24. In particular, in the present modification, the lower portion 64 is disposed so as to partially overlap with the region surrounded by the coil 80 when viewed along a direction orthogonal to the second main surface 24. The second column portion 72 passes through the region surrounded by the coil 80. In this modification, the second column part 72 does not reach the recess 32, but this does not limit the present invention, and the second column part 72 may reach the recess 32.

(Second modification)
As in the second modification shown in FIGS. 7 and 8, the antenna device 10b may include a flat magnetic body 60b. The illustrated magnetic body 60b has the same arrangement as the lower part 64 of the magnetic body 60 according to the above-described embodiment. That is, the magnetic body 60 b extends from the inside of the recess 32 (that is, the outside of the closed loop edge 30) to the inside of the opening 40 when viewed along the direction orthogonal to the second main surface 24. In addition, the magnetic body 60b is disposed so that the entire region surrounded by the coil 80 and a part of the magnetic body 60b overlap when viewed along a direction orthogonal to the second main surface 24. The magnetic body 60b may be disposed so as to partially overlap the region surrounded by the coil 80 when viewed along a direction orthogonal to the second main surface 24.

(Third Modification)
Like the 3rd modification shown by FIG.9 and FIG.10, the antenna apparatus 10c may be further provided with the magnetic body 60c of a different shape. The illustrated magnetic body 60c includes a flat plate-like lower portion 64c, a first column portion 70c extending from the lower portion 64c so as to penetrate through the opening portion 40, and an upper end of the first column portion 70c above the edge of the opening portion 40. A first projecting portion 74 projecting over, a second column portion 72c extending from the lower portion 64 through the region surrounded by the coil 80 into the recess 32, and a coil from the upper end of the second column portion 72c. And a second projecting portion 76 projecting above 80.

  The lower portion 64 c extends from the inside of the recess 32 (that is, the outside of the closed loop edge 30) to the inside of the opening 40 when viewed along a direction orthogonal to the second main surface 24. In particular, in the present modification, the lower portion 64 c is disposed so as to partially overlap the region surrounded by the coil 80 when viewed along a direction orthogonal to the second main surface 24.

  The projecting directions of the first projecting portion 74 and the second projecting portion 76 are opposite to each other. The first overhang portion 74 is located on the first main surface 22 of the conductor plate 20, and the second overhang portion 76 is located in the recess 32. However, the present invention is not limited to this, and the second pillar portion 72c may penetrate through the recess 32, and the second overhang portion 76 is located on the first main surface 22. May be.

(Fourth modification)
In the embodiment described above, the magnetic body 60 was not shaped to cover the entire bottom surface side of the coil 80, so that the coil 80 could be confirmed from the bottom surface side, but the present invention is not limited to this. . For example, as in the fourth modified example shown in FIG. 11, the magnetic body 60 d of the antenna device 10 d may have a lower portion 64 d whose area is expanded so as to cover the entire bottom surface side of the coil 80. In this case, since the coil 80 is hidden behind the lower part 64d of the magnetic body 60d, it cannot be visually recognized from the bottom surface side.

(5th modification)
In the fourth modification described above, the lower part 64d of the magnetic body 60d, which is a single member, covers the entire bottom surface of the coil 80. However, as in the fifth modification shown in FIG. 10e may have two members of a magnetic body 60 and an additional magnetic body 78. The magnetic body 60 has the same shape as that according to the above-described embodiment. The additional magnetic body 78 is provided close to the lower portion 64 of the magnetic body 60 and covers almost all of the bottom surface side of the coil 80. As a result, the coil 80 cannot be confirmed from the bottom side except for a slight gap between the magnetic body 60 and the additional magnetic body 78.

(6th modification-8th modification)
As in the sixth modification shown in FIGS. 13 and 14, the antenna device 10 f may further include a shield plate 90 in addition to the conductor plate 20, the magnetic body 60, and the coil 80. The shield plate 90 according to this modification is disposed below the lower portion 64 of the magnetic body 60. That is, the lower part 64 of the magnetic body 60 is located between the second main surface 24 of the conductor plate 20 and the shield plate 90. Specifically, the shield plate 90 has substantially the same size as the lower portion 64 of the magnetic body 60 when viewed along a direction orthogonal to the second main surface 24 of the conductor plate 20. The lower part 64 is completely covered by the shield plate 90 and cannot be visually recognized. The shield plate 90 may have a larger size, for example. Further, like the antenna device 10g according to the seventh modification shown in FIG. 15, the shield plate 90g may be provided with a slit 92, or the shield plate 90g is made square with the slit 92 having a larger width. It is good also as comprising in C shape. Further, as in the antenna device 10h according to the eighth modification shown in FIG. 16, the shield plate 90h may be composed of two (a plurality of) conductor plates and disposed so as to provide a gap 94 therebetween. good. If a slit 92 or a gap 94 is provided for the shield plates 90, 90g, 90h, a short loop constituted by the coil 80 and the opening 40 of the conductor plate 20 and the shield plates 90, 90g, 90h are provided. The interference with the eddy current generated in can be reduced.

(Ninth Modification and Tenth Modification)
In the embodiment described above, the recess 32 is provided in the outer edge 26 of the conductor plate 20, but the present invention is not limited to this.

  For example, unlike the conductor plate 20i according to the ninth modification shown in FIG. 17, the concave portion 32 may not be provided, and therefore the square closed-loop edge 30i may be formed only by the outer edge 26. In this modification, when viewed along a direction orthogonal to the second main surface 24 of the conductor plate 20i, a region (shown by a broken line) surrounded by a coil (not shown) straddles the outer edge 26i. A coil (not shown) is provided. The coil (not shown) may be provided such that the entire region surrounded by the coil (not shown) is outside the outer edge 26i.

  Further, as in the conductor plate 20j according to the tenth modification shown in FIG. 18, not only the opening 40 constituting a short loop (closed loop) but also an additional opening connected by the slit 36 to the outer edge 26j. 34 may be included. In the case of this conductor plate 20j, both edges of the slit 36 (two edges sandwiching the slit 36), an edge constituting the additional opening 34, and the outer edge 26j constitute a closed loop edge 30j. In this modification, when viewed along a direction orthogonal to the second main surface 24 of the conductor plate 20j, a region (shown by a broken line) surrounded by a coil (not shown) is an additional opening 34. It is provided so as to overlap the entire internal area. The coil (not shown) may be provided such that the area surrounded by the coil (not shown) at least partially overlaps the area inside the additional opening 34.

(Eleventh modification)
In the above-described embodiment, the coil 80 is provided so that the region surrounded by the coil 80 intersects the closed loop edge 30, but the present invention is not limited to this, and for example, FIG. The coil 80 may be arranged so as not to overlap the conductor plate 20 when viewed along a direction orthogonal to the second main surface 24 as in the eleventh modification shown. That is, the coil 80 may be arranged so that the entire region surrounded by the coil 80 is located outside the closed loop edge 30. However, the coil 80 is preferably located as close to the closed loop edge 30 as possible.

(Twelfth Modification and Thirteenth Modification)
In the embodiment described above, the number of conductor plates 20 is one, but the present invention is not limited to this.

  For example, as in the twelfth modification shown in FIG. 20, in addition to the conductor plate 20i, an additional conductor plate 50 having a straight edge may be provided. As shown in the drawing, the conductor plate 20i is the same as that according to the ninth modification not having the recess 32, and the additional conductor plate 50 includes the edge of the conductor plate 20i and the edge of the additional conductor plate 50. Are arranged so as to face each other and to form a gap 52 therebetween. In the case of this modification, the coil (not shown) has a gap 52 in a region (shown by a broken line) surrounded by the coil (not shown) when viewed along a direction orthogonal to the second main surface 24. And are arranged so as to partially overlap.

  Further, as in the thirteenth modification shown in FIG. 21, in addition to the conductor plate 20, an angular C-shaped additional conductor plate 50 k may be provided. As shown, the conductor plate 20 is the same as that according to the above-described embodiment, and the additional conductor plate 50k is arranged so as to form the window 54 together with the outer edge 26 of the conductor plate 20. In the case of this modification, when viewed along a direction orthogonal to the second main surface 24, the coil (not shown) has an area surrounded by the coil (not shown) (shown by a broken line) as the window 54. And at least partially overlap.

(14th modification and 15th modification)
In the embodiment described above, when the coil 80 is viewed along the direction orthogonal to the second main surface 24 of the conductor plate 20, the region surrounded by the coil 80 and the outside of the closed loop edge 30 are at least partially. Although they are arranged so as to overlap, this point may be changed as in the antenna device according to the fourteenth modification or the fifteenth modification shown below, for example.

  22 and 23, in the antenna device 10l according to the fourteenth modified example, the coil 80l is formed by bending a planar coil so as to be vertically asymmetric, and the second main surface 24 of the conductor plate 20i. In a plane (vertical plane) orthogonal to the angled J-shaped cross section.

  The magnetic body 60l includes a flat upper part 62l and a lower part 64l, a through part 66l that penetrates through the opening 40 and connects the upper part 62l and the lower part 64l, and an upper part 62l and a lower part outside the outer edge 26i of the conductor plate 20i. And a connecting portion 68l for connecting the connecting portion 64l. The lower portion 64l extends from the outside of the closed loop edge 30i to the inside of the opening 40 when viewed along a direction orthogonal to the second main surface 24 of the conductor plate 20. In particular, the lower portion 64l according to this modification passes through the region surrounded by the coil 80l.

  In the case of such a modification, the communication distance can be obtained not only in the direction orthogonal to the conductor plate 20i but also in the direction horizontal to the conductor plate 20i.

  Referring to FIG. 24, the magnetic body 60m of the antenna device 10m according to the fifteenth modified example penetrates the flat upper portion 62m and the lower portion 64m and the opening 40, like the magnetic member 60l according to the fourteenth modified example. A through portion 66m that connects the upper portion 62m and the lower portion 64m, and a connecting portion 68m that connects the upper portion 62m and the lower portion 64m outside the outer edge 26i of the conductor plate 20i are provided. The lower part 64m extends from the outside of the closed loop edge 30i to the inside of the opening 40 when viewed along a direction orthogonal to the second main surface 24 of the conductor plate 20.

  The coil 80m according to this modification is wound around the lower part 64m of the magnetic body 60m. That is, the lower part 64m is used as a magnetic core of the coil 80m, and the coil 80m constitutes a bar antenna.

  In the case of such a modification, the communication distance can be obtained not only in the direction orthogonal to the conductor plate 20i but also in the direction horizontal to the conductor plate 20i.

  In the fourteenth modification and the fifteenth modification described above, the magnetic bodies 60l and 60m may be modified as in the first to third modifications. Further, the conductor plate 20i may be modified like the conductor plate 20 having the recess 32 according to the embodiment or the conductor plate 20j according to the tenth modification.

  In order to verify the effect of the antenna device 10 according to the above-described embodiment, the following was produced as an example. An 80 mm × 50 mm aluminum plate was used as the conductor plate 20, an opening 40 of 10 mm × 10 mm was provided, and a recess 32 of 15 mm × 7 mm was formed on the outer edge 26. The coil 80 has a size of 20 mm × 5 mm, and is disposed below the second main surface 24 so as to partially overlap the recess 32. The magnetic body 60 was configured to have the shape shown in FIGS. 1 to 4 using a soft magnetic sheet having a thickness of 0.1 mm.

  As a comparative example, a conductor plate 20 ′ having no opening and only a recess was prepared. The coil 80 has the same size as that of the example, and the arrangement of the coil 80 is the same as that of the example. That is, the coil 80 is disposed below the second main surface of the conductor plate 20 ′ so as to partially overlap the recess. About a magnetic body, it arranged so that it might overlap with the coil 80 by making a size into 20 mm x 5 mm.

  The characteristics of the antenna device 10 according to the example and the antenna device 10 ′ according to the comparative example were measured with the transmitting coil having a diameter of 70 mm facing each other. As a result, the distribution of the magnetic field strength is shown in FIG. 25, and the relationship between the antenna distance and the coupling coefficient is shown in FIG. As understood from FIG. 25, it is understood that the magnetic field distribution is wider in the antenna device 10 according to the embodiment than in the antenna device 10 ′ according to the comparative example. That is, according to the present invention, the communication distance can be increased. As is clear from FIG. 26, the antenna device 10 according to the example has a higher antenna coupling coefficient than the antenna device 10 'according to the comparative example.

10, 10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h, 10l, 10m Antenna device 20, 20i, 20j, 20 'Conductor plate 22 First main surface 24 Second main surface 26, 26i, 26j Outer edge 30 , 30i, 30j Closed loop edge 32 Recess 34 Additional opening 36 Slit 40 Opening 50, 50k Additional conductor plate 52 Gap 54 Window 60, 60a, 60b, 60c, 60d, 60l, 60m Magnetic body 62, 62l, 62m upper part 64, 64b, 64c, 64d, 64l, 64m lower part 66, 66l, 66m penetrating part 68, 68l, 68m connecting part 70, 70c first pillar part 72, 72c second pillar part 74 first overhanging part 76 first 2 Overhanging portion 78 Additional magnetic material 80, 80 l, 80 m Coil 90, 90 g, 90 h Shield plate 92 Lit 94 gap 100 transmission coil

Claims (11)

A conductive plate having a first main surface and a second main surface which is the back surface of the first main surface and an outer edge, and is separated from the closed loop edge and the closed loop edge, which are a closed circuit composed of the outer edge or an edge including the outer edge. A conductive plate comprising a plurality of openings,
A magnetic body provided to extend from the outside of the closed loop edge to the inside of the opening when viewed along a direction orthogonal to the second main surface of the conductor plate;
An antenna device comprising a coil,
When the coil is viewed along a direction orthogonal to the second main surface of the conductor plate, the region surrounded by the coil and the outside of the closed loop edge of the conductor plate at least partially overlap each other. And the region surrounded by the coil and the opening of the conductor plate are arranged so as not to overlap ,
The conductor plate has a recess recessed from the outer edge toward the opening,
The edge constituting the recess constitutes the closed loop edge together with the outer edge,
The coil is arranged such that the region in the recess and the region surrounded by the coil at least partially overlap when viewed along a direction orthogonal to the second main surface of the conductor plate. The antenna device. A conductive plate having a first main surface and a second main surface which is the back surface of the first main surface and an outer edge, and is separated from the closed loop edge and the closed loop edge, which are a closed circuit composed of the outer edge or an edge including the outer edge. A conductive plate comprising a plurality of openings,
A magnetic body provided to extend from the outside of the closed loop edge to the inside of the opening when viewed along a direction orthogonal to the second main surface of the conductor plate;
An antenna device comprising a coil,
When the coil is viewed along a direction orthogonal to the second main surface of the conductor plate, the region surrounded by the coil and the outside of the closed loop edge of the conductor plate at least partially overlap each other. And the region surrounded by the coil and the opening of the conductor plate are arranged so as not to overlap ,
In the conductor plate, an additional opening connected to the outer edge by a slit is formed,
Both edges of the slit and the edge constituting the additional opening constitute the closed loop edge together with the outer edge,
When the coil is viewed along a direction orthogonal to the second main surface of the conductor plate, the region in the additional opening and the region surrounded by the coil overlap at least partially. An antenna device arranged in a <br/>. A conductive plate having a first main surface and a second main surface which is the back surface of the first main surface and an outer edge, and is separated from the closed loop edge and the closed loop edge, which are a closed circuit composed of the outer edge or an edge including the outer edge. A conductive plate comprising a plurality of openings,
A magnetic body provided to extend from the outside of the closed loop edge to the inside of the opening when viewed along a direction orthogonal to the second main surface of the conductor plate;
An antenna device comprising a coil,
When the coil is viewed along a direction orthogonal to the second main surface of the conductor plate, the region surrounded by the coil and the outside of the closed loop edge of the conductor plate at least partially overlap each other. And the region surrounded by the coil and the opening of the conductor plate are arranged so as not to overlap ,
The antenna device is arranged such that the coil does not overlap the conductor plate when viewed along a direction orthogonal to the second main surface of the conductor plate . The antenna device according to claim 3, wherein
The conductor plate has a recess recessed from the outer edge toward the opening,
The edge constituting the recess constitutes the closed loop edge together with the outer edge,
The coil is arranged such that the region in the recess and the region surrounded by the coil at least partially overlap when viewed along a direction orthogonal to the second main surface of the conductor plate. Antenna device. The antenna device according to claim 3, wherein
In the conductor plate, an additional opening connected to the outer edge by a slit is formed,
Both edges of the slit and the edge constituting the additional opening constitute the closed loop edge together with the outer edge,
When the coil is viewed along a direction orthogonal to the second main surface of the conductor plate, the region in the additional opening and the region surrounded by the coil overlap at least partially. Antenna device arranged in A conductive plate having a first main surface and a second main surface which is the back surface of the first main surface and an outer edge, and is separated from the closed loop edge and the closed loop edge, which are a closed circuit composed of the outer edge or an edge including the outer edge. A conductive plate comprising a plurality of openings,
A magnetic body provided to extend from the outside of the closed loop edge to the inside of the opening when viewed along a direction orthogonal to the second main surface of the conductor plate;
An antenna device comprising a coil,
When the coil is viewed along a direction orthogonal to the second main surface of the conductor plate, the region surrounded by the coil and the outside of the closed loop edge of the conductor plate at least partially overlap each other. And the region surrounded by the coil and the opening of the conductor plate are arranged so as not to overlap ,
The antenna device further includes an additional conductor plate,
The conductor plate and the additional conductor plate are arranged to form a window or a gap when viewed along a direction orthogonal to the second main surface of the conductor plate,
The coil is disposed such that the window or gap and a region surrounded by the coil overlap at least partially when viewed along a direction orthogonal to the second main surface of the conductor plate. There is an antenna device. The antenna device according to claim 1 or 2 ,
The antenna device, wherein the coil is at least partially sandwiched between the second main surface of the conductor plate and the magnetic body. The antenna device according to any one of claims 1 to 7 ,
The antenna device, wherein the magnetic body partially overlaps a region surrounded by the coil when viewed along a direction orthogonal to the second main surface of the conductor plate. The antenna device according to claim 8 , wherein
The antenna device, wherein the magnetic body extends to or penetrates at least one of a region surrounded by the coil and the opening of the conductor plate. An antenna device according to any one of claims 1 to 9 ,
The antenna device communicates with a transmission coil on the other side,
The antenna device, wherein the transmission coil is disposed on the first main surface side, and the coil is disposed on the second main surface side. The antenna device according to any one of claims 1 to 10 ,
The antenna device further includes a shield plate,
The antenna device, wherein the magnetic body is located at least partially between the second main surface of the conductor plate and the shield plate.