JP5396531B1 - Electronic device and communication method using the same - Google Patents

Abstract

Provided is an electronic device capable of communicating with a transmitting device without being restricted in terms of design and strength of the conductor. A magnetic body, a coil, and a conductor are provided. Communication with the transmitter 3 is performed using an electronic device having the above. The conductor 20 has a front surface 22 and a back surface 24, and the front surface 22 is a surface closer to the transmitting device 3 than the back surface 24. The coil 30 is formed by winding a conducting wire 32, and has a coil surface 40 surrounded by the conducting wire 32. In such an electronic device, the specific magnetic flux line 62 that passes through the coil surface 40 through the end portion 26 of the conductor 20 and passes through the coil surface 40 among the magnetic flux lines 60 generated by the transmitter is captured. The coil 30 is arranged on the back surface 24 side so that it can be performed.
[Selection] Figure 5

Description

  The present invention relates to an electronic device, and more particularly to an electronic device that performs communication using an electromagnetic induction effect with another electronic device.

  In general, when an antenna device such as an NFC antenna is incorporated in an electronic device such as a mobile phone, a coil surface on the antenna device side (a region surrounded by a conductive wire through which a magnetic flux line from the transmission device penetrates) and the transmission device Must be placed so that they face each other. Further, in order to more effectively perform electromagnetic coupling with the transmitting device, a magnetic body provided so as to penetrate the coil surface is used, and further, the coil is attached to the magnetic body after adjusting the angle of the coil axis. Has been proposed (see, for example, Patent Document 1).

  However, in such a configuration, when a conductor is present between the antenna device and the transmission device, electromagnetic coupling cannot be performed (or the characteristics are deteriorated). It is laid out so that no conductor is arranged between the devices.

  On the other hand, Patent Document 2 discloses a configuration in which a conductor in which an opening (slit) is formed is disposed between an antenna device and a transmission device to largely bypass magnetic flux.

JP 2010-245776 A JP 2011-103702 A

  However, in the configuration of Patent Document 2, as long as electromagnetic coupling with the transmission device is performed, the conductor must be provided with an opening, and the like, because there are restrictions on the design and strength of the conductor. For example, electronic device parts or the electronic device itself cannot be used as a conductor.

  An object of the present invention is to provide an electronic device that can communicate with a transmission device by a method different from the methods disclosed in Patent Document 1 and Patent Document 2.

  As shown in FIG. 1, when there is a conductor ahead of the traveling direction, the magnetic flux lines generated at the transmitting antenna of the transmitting device travel around the conductor. The inventors of the present invention pay attention to magnetic flux lines (hereinafter referred to as “specific magnetic flux lines”) that enter the back side of the electric conductor so as to go around the end portion of the electric conductor, and use the specific magnetic flux lines. The structure of an electronic device for performing good communication with a transmitting device has been found. The present invention is based on such knowledge.

That is, according to the present invention, the first electronic device includes a first conductor having a front surface and a back surface opposite to the front surface, and a coil formed by winding a conductive wire. An electronic device comprising a coil having a coil surface surrounded by the conducting wire,
The front surface is a surface closer to a transmission device including a transmission antenna than the back surface,
The coil captures the specific magnetic flux line by passing through the coil surface a specific magnetic flux line that passes through an end portion of the first conductor among the magnetic flux lines generated by the transmitting antenna and passes through the coil surface. Thus, an electronic device arranged on the back side can be obtained.

According to the present invention, the second electronic device is a first electronic device,
When viewed from the front surface side, an electronic device is obtained in which the coil is disposed on the back surface side so as not to protrude from the end portion of the first conductor.

According to the present invention, the third electronic device is a second electronic device,
An electronic device in which the coil is disposed close to the end of the first conductor is obtained.

According to the present invention, as the fourth electronic device, any one of the first to third electronic devices,
A magnetic body having a first surface and a second surface opposite to the first surface;
The first surface is a surface closer to the transmitting device than the second surface;
The coil is composed of a conductor pattern formed in an insulating sheet shape, and is arranged from the first surface to the second surface,
Among the coil surfaces, an electronic device in which the area of the first coil surface located on the first surface and the area of the second coil surface located on the second surface are different from each other is obtained.

Moreover, according to this invention, it is a 4th electronic device as a 5th electronic device,
The magnetic body is disposed on the back surface such that a specific end that is one end of the magnetic body and an end of the conductor are aligned in a first direction orthogonal to the back surface,
The coil is arranged so as to at least partially cover the specific end,
As for the said conducting wire contained in the part distribute | arranged on the said 2nd surface among the said coils, the electronic device which adjoins to the said specific end part is obtained.

According to the present invention, the sixth electronic device is any one of the first to third electronic devices,
A magnetic body having a first surface and a second surface opposite to the first surface;
The first surface is a surface closer to the transmitting device than the second surface;
The conducting wire of the coil is wound around the magnetic body,
Of the conducting wires, the first conducting wire portion located on the first surface and the second conducting wire portion located on the second surface are arranged so as not to overlap in a first direction orthogonal to the back surface. Can be obtained.

According to the present invention, the seventh electronic device is a sixth electronic device,
The magnetic body is disposed on the back surface such that a specific end that is one end of the magnetic body and an end of the first conductor are aligned in the first direction,
The second coil portion is an electronic device that is close to the specific end.

According to the present invention, as the eighth electronic device, any one of the fourth to seventh electronic devices,
The magnetic body has an extension where the coil is not arranged,
The extension part can obtain an electronic device extending in a direction away from the end of the conductor.

According to the present invention, as the ninth electronic device, any one of the first to eighth electronic devices,
The first conductor has a recess formed by cutting out a portion including a part of the back surface and a part of the end portion of the first conductor.
The coil provides an electronic device arranged in the recess.

According to the present invention, the tenth electronic device is any one of the first to ninth electronic devices,
A second conductor;
The coil is disposed so as to be sandwiched between the first conductor and the second conductor,
When viewed from the surface of the first conductor, an electronic device in which the second conductor protrudes from the end of the first conductor is obtained.

According to the present invention, the eleventh electronic device is a tenth electronic device,
An electronic apparatus is further provided that further includes a third conductor that is opposed to the end portion of the first conductor and is opposed to the second conductor and that is adjacent to the second conductor.

  In addition, according to the present invention, a method of communicating with the transmitting device can be obtained by making the surface of the first conductor of any one of the first to eleventh electronic devices face the transmitting device.

According to the present invention, as an electronic device, the coil has a reception sensitivity axis that maximizes sensitivity to the specific magnetic flux line.
An electronic device in which the coil is arranged so that the reception sensitivity axis and the direction of the specific magnetic flux line coincide is obtained.

  According to the present invention, the coil is disposed on the back surface side of the first conductor so that the specific magnetic flux lines that wrap around the back surface side of the first conductor among the magnetic flux lines generated by the transmitting antenna can be captured. Thereby, communication can be performed even when a conductor has to be disposed between the coil and the transmission antenna (for example, when an antenna is disposed on the back surface of a metal case of an electronic device).

  In particular, by arranging a magnetic material, the magnetic flux lines that wrap around are gathered toward the magnetic material without being diffused. Therefore, by making the magnetic flux penetrating the magnetic body coincide with the magnetic flux of the coil, the magnetic field energy can be collected efficiently and strong antenna coupling can be obtained.

  In particular, since the coil is arranged so that the angle of the coil axis (axis orthogonal to the coil surface) of the electronic device can correspond to the angle of the specific magnetic flux line, good characteristics can be obtained.

  Furthermore, since it is not necessary to provide the conductor with an opening (slit) for passing magnetic flux lines, the degree of freedom in design and strength is high.

It is the result of having simulated the direction of the magnetic flux around the metal plate of the magnetic flux line generated with the transmitting antenna. It is a figure showing the positional relationship of the antenna part of the electronic device by embodiment of this invention, and a conductor. It is a figure showing the other positional relationship of the antenna part of the electronic device by embodiment of this invention, and a conductor. It is a perspective view showing the antenna part and conductor which are contained in the electronic device by embodiment of this invention. It is sectional drawing which shows typically the antenna part of FIG. 4, and the approach path | route of a specific magnetic flux line. In the figure, an extension is attached. It is sectional drawing which shows typically a mode that the specific magnetic flux line is captured by the antenna part by the modification which changed the winding method of conducting wire from the antenna part of FIG. It is a perspective view showing the other antenna part and conductor contained in the electronic device by embodiment of this invention. It is a top view of the coil used for the antenna part of FIG. It is sectional drawing which shows typically the approach path | route of the specific magnetic flux line at the time of arrange | positioning the antenna part of FIG. 7 on a conductor. FIG. 9 is a cross-sectional view schematically showing an antenna unit in which the coil of FIG. 8 is arranged on a magnetic body by a method different from that of the antenna unit of FIG. It is the figure which represented typically the antenna part of FIG. 9, and the path | route of a specific magnetic flux line. It is the figure which represented typically the antenna part of FIG. 10, and the path | route of a specific magnetic flux line. It is the figure which represented typically the modification of an antenna part, and the path | route of a specific magnetic flux line. It is the figure which represented typically the other modification of an antenna part, and the path | route of a specific magnetic flux line. It is the figure which represented typically the modification of the conductor, and the path | route of a specific magnetic flux line. It is the figure which represented typically the example which added and arrange | positioned another conductor, and the path | route of the specific magnetic flux line in the said example. It is the figure which represented typically the example which has arrange | positioned another conductor in addition to the conductor of FIG. 15, and the path | route of the specific magnetic flux line in the said example. It is the figure which represented typically the example which added and arrange | positioned two conductors, and the path | route of the specific magnetic flux line in the said example. It is a figure showing a part of electronic device in the example by which a conductor is comprised by a some conductor. It is a figure showing a part of electronic device in other examples with which a conductor is constituted by a plurality of conductors. It is a figure showing the cross section of the electronic device at the time of forming a case cover and an antenna part as one unit. It is a figure showing the cross section of the electronic device at the time of forming a battery pack and an antenna part as one unit. It is a figure which shows the example of mounting at the time of arrange | positioning an antenna part to a case cover. It is a figure which shows the electronic device by the example of mounting of FIG. 23, and the incident direction of a magnetic flux line. It is a figure which shows the example of mounting at the time of arrange | positioning an antenna part to a liquid crystal display module. It is a figure which shows the electronic device by the example of mounting of FIG. 25, and the incident direction of a magnetic flux line. It is a figure which shows the antenna of this invention in Example 1. FIG. FIG. 3 is a diagram illustrating a conventional antenna in Example 1. It is sectional drawing along the IXXX--IXXX line of the antenna of FIG.

  As shown in FIG. 2, an electronic device 1 according to an embodiment of the present invention includes an antenna 2 for communicating with a transmission device 3. The electronic device 1 includes a metal conductor 20 such as a housing cover. As shown in FIG. 3, an electronic device 1a according to another embodiment of the present invention includes an antenna 2 and a conductor 20a such as a battery. As shown in FIGS. 2 and 3, the conductors 20, 20 a of the electronic devices 1, 1 a according to the present invention have a front surface 22 and a back surface 24 that is a surface opposite to the front surface 22. Here, the front surface 22 is a surface closer to the transmitting device 3 than the back surface 24. That is, the distance between the transmission device 3 and the front surface 22 is shorter than the distance between the transmission device 3 and the back surface 24. As described above, the present invention generally includes at least the antenna 2 and the conductors 20 and 20a, and the antenna 2 is disposed on the back surface 24 of the conductors 20 and 20a. Between which the conductors 20 and 20a are present.

  As shown in FIG. 4, the antenna 2 according to this embodiment includes a coil 30 and a magnetic body 50. The magnetic body 50 has a first surface 51 and a second surface 52 that is a surface opposite to the first surface 51. Referring also to FIG. 1, the first surface 51 of the magnetic body 50 is closer to the transmission device 3 than the second surface 52. In other words, the first surface 51 is also a surface facing the back surface 24 of the conductor 20. In the present embodiment, the end portion 54 of the magnetic body 50 is arranged in a vertical direction (a direction orthogonal to the back surface 24) so as to be flush with the end portion 26 of the conductor 20. That is, when viewed from the front surface 22 side of the conductor 20, the magnetic body 50 is disposed on the back surface 24 side of the conductor 20 so as to be hidden behind the conductor 20 and protrudes from the end portion 26 of the conductor 20. I do not.

  The coil 30 is formed by winding a conducting wire 32 around a magnetic body 50, and is therefore located on the back surface 24 side of the conductor 20. Specifically, the coil 30 connects the conducting wire (first conducting wire portion 35) located on the first surface 51, the conducting wire (second conducting wire portion 36) located on the second surface, and both ends thereof. It consists of a conducting wire arranged on the side. The coil 30 has a coil surface 40 surrounded by the conducting wire 32 wound in this manner. As shown in FIGS. 4 and 5, the coil surface 40 according to the present embodiment is inclined from the horizontal direction.

  As shown in FIG. 5, the magnetic flux lines 60 generated by the transmission antenna (not shown) of the transmission device 3 travel toward the conductor 20. Here, as understood from FIG. 1, among the magnetic flux lines 60, magnetic flux lines passing through the vicinity of the end portion 26 of the conductor 20 (hereinafter referred to as “specific magnetic flux lines 62”). Proceed to wrap around. The coil 30 can capture the specific magnetic flux line 62 when the specific magnetic flux line 62 penetrates the coil surface 40. That is, the coil 30 can perform communication using the electromagnetic induction effect by the specific magnetic flux line 62. In this embodiment, since the magnetic body 50 penetrates the illustrated coil surface 40 by winding the coil 30 around the magnetic body 50, the specific magnetic flux line 62 is effective on the coil surface 40. Can be passed through. Further, since the end portion 54 of the magnetic body 50 and the end portion 26 of the conductor 20 are arranged on the same plane, the specific magnetic flux line 62 can be efficiently drawn into the magnetic body 50. In addition, since the first conductive wire portion 35 is disposed close to the end portion 54 of the magnetic body 50, the inclination of the coil axis can be matched with the angle of the incident path of the specific magnetic flux line 62. And the specific magnetic flux line 62 can be made stronger.

  Here, the coil 30 according to the present embodiment has a reception sensitivity axis that maximizes the sensitivity of the coil 30 to the specific magnetic flux line 62. The coil 30 is arranged so that the direction of the reception sensitivity axis coincides with the direction of the specific magnetic flux line 62.

  In the present embodiment, of the side surfaces of the magnetic body 50, the extension portion 70 (additional magnetic body) is provided on the side surface opposite to the end portion 54. The extension portion 70 extends in a direction away from the end portion 26 of the conductor 20 (the end portion 54 of the magnetic body 50). As a result, more specific magnetic flux lines 62 can be drawn in, and can be efficiently passed through the coil surface 40.

  As shown in FIG. 6, the conducting wire 32 may be wound around the magnetic body 50 so that the coil axis is horizontal. However, in this case, there is a possibility that the specific magnetic flux line 62 leaks out from the gap of the conducting wire 32. That is, the amount of the specific magnetic flux line 62 that passes through the coil surface (not shown) is reduced. Therefore, the winding method of the conducting wire 32 is preferably the method shown in FIG.

  In the antenna described above, the coil is wound directly around the magnetic body 50, but a conductor pattern may be formed on the FPC and attached to the magnetic body. As shown in FIG. 7, the antenna 2 b according to the modification of the present invention includes a coil 30 b in which a conductor pattern 33 is formed on an insulating sheet such as an FPC 34, and a magnetic body 50. As shown in FIGS. 8 and 9, the conductor pattern 33 is formed in a spiral shape. The coil 30b is bent at the dotted line portion of FIG. 8 and is attached to the magnetic body 50 so as to cover the end portion 54 and not cover the end portion 55 opposite to the end portion 54. At this time, as can be understood from FIGS. 7 and 8, the first coil surface 41 surrounded by the conductor pattern 33 on the first surface 51 of the magnetic body 50 and the second surface 52 of the magnetic body 50. The area of the second coil surface 42 that is surrounded on three sides by the upper conductive pattern 33 is different, and the area of the second coil surface 42 is smaller. According to such a configuration, the conductor pattern 33 constituting the second coil surface 42 can be brought close to the end portion 54. If the area of the second coil surface 42 is reduced to 0 (that is, the conductor pattern 33 is brought closer to the end portion 54), the range in which the specific magnetic flux line 62 (see FIG. 9) can be captured is further expanded. In addition, the coil axis can be adjusted to the angle of the specific magnetic flux line 62. As shown in FIG. 9, the specific magnetic flux line 62 penetrates the coil surface 40 b (see FIG. 8) so as to particularly pass through the surface of the end portion 54 of the magnetic body 50.

  The antenna 2c shown in FIG. 10 is different from the coil 30b shown in FIG. As shown in FIG. 10, the coil 30 b is attached so as to cover the end 55 on the opposite side of the end 54 of the magnetic body 50 and not cover the end 54.

  As can be understood by comparing FIGS. 9 to 12, the coil 30b of FIG. 9 can also capture specific magnetic flux properties 62L and 62R (see FIG. 11), whereas the coil of FIG. 30c cannot capture the specific magnetic flux lines 62R and 62L (see FIG. 12). Therefore, as a method of attaching to the magnetic body 50, the method of the coil 30b shown in FIG. 9 is desirable.

  As described above, each of the coils 30 and 30a to 30c described with reference to FIGS. 4, 9, and 10 mainly captures the specific magnetic flux line 62 that penetrates the end portion 54 of the magnetic body 50, and further increases the coil surface. A winding method has been adopted in which the direction of the receiving sensitivity axis of the coils 30 and 30a to 30c and the direction of the specific magnetic flux line 62 are matched as much as possible. However, as shown in FIG. 13, the coil 30d is formed only on the second surface 52 of the magnetic body 50, or the coil 30e is such that the coil axis is horizontal only in the vicinity of the end portion 54 of the magnetic body 50. The structure which forms is also included in the present invention. However, in order to make the direction of the reception sensitivity axis of the coil coincide with the direction of the specific magnetic flux line and increase the sensitivity of transmission / reception, the coils 30, 30a to 30c shown in FIGS. 4, 9, and 10 are used. It is preferable.

  Next, a modification of the configuration of the conductor will be described using the antenna 2b described with reference to FIGS. 7 to 9 as an example. As shown in FIG. 15, a recess 56 formed by cutting out the conductor 20b so as to include a part of the end portion 26b and the back surface 24b of the conductor 20b is formed, and the antenna 2b is placed in the recess 56. Also good. In the present embodiment, the back surface 24b of the conductor 20b and the second surface 52 of the magnetic body 50 are configured to be flush with each other.

  In addition, as shown in FIG. 16, even when a conductor (second conductor) 80 is newly provided and the antenna 2 b is sandwiched between the conductor 20 and the conductor 80, the magnetic flux lines are captured. can do. In this case, as shown in the drawing, when viewed from the surface 22 of the conductor 20, the conductor 80 may protrude from the conductor 20 (ie, protrude) and partially visible. Thereby, a part of magnetic flux line 60 can be guide | induced to the antenna 2b side, and the number of the magnetic flux lines 60 (specific magnetic flux line 62) which passes a coil surface (not shown) can be increased. As another modification of the arrangement, the same effect can be obtained even when the antenna 2b is sandwiched between the conductor 20b and the conductor 80 of FIG. 15, as shown in FIG.

  Furthermore, as shown in FIG. 18, a conductor (third conductor) 85 may be provided so as to face both the surface 82 of the conductor 80 and the end portion 26 of the antenna 2b. In this case, the magnetic flux lines 60 that have entered from the gap between the conductor 20 and the conductor 85 can be captured.

  As shown in FIG. 19, a plurality of metal plates 21 may be combined into one conductor 20c, and the antenna 2 may be disposed on the back surface thereof. The conductor 20d may be configured by the circuit 23 and the battery 25. That is, the electric conductor included in the electronic device may be composed of a plurality of members.

  As shown in FIG. 21, the antenna 2 b according to the present embodiment may be a single unit 100 in a state where it is attached in advance to the case cover 102, for example. In this case, the unit 100 and the battery 112 are disposed adjacent to each other in the electronic device. Further, as shown in FIG. 22, one unit 110 (battery package) may be provided in a state of being affixed to the battery 112 in advance. Also in this case, the case cover 102 is attached directly to the unit 110 or to the casing of the electronic device in which the unit 110 is housed.

  Next, an example of mounting an antenna on a portable electronic device will be described. 23 and 24, the portable electronic device 90a includes a cover 92, a communication circuit 94, a display module 96, and a battery 98. The portable electronic device 90 a in this mounting example is assembled with the antenna 2 attached to the vicinity of the upper end of the back surface of the cover 92. As shown in FIG. 24, the assembled mobile electronic device 90a captures the magnetic flux lines 60 with the cover 92 located on the back of the mobile electronic device 90a facing the transmitting device (not shown). To do. As shown in FIGS. 25 and 26, the portable electronic device 90b is assembled with the antenna 2 attached to the vicinity of the upper end of the back surface of the display module 96 on the front surface side. The portable electronic device 90b assembled in this manner captures the magnetic flux lines 60 with the front surface of the portable electronic device 90b facing a transmitting device (not shown) as shown in FIG.

  An embodiment of the present invention will be described using the same structure as the antenna 2 of FIG. As shown in FIG. 27, the magnetic body 50 and the coil 30 are included. The magnetic body 50 was a ferrite sheet having a size of 40 mm × 20 mm × 0.3 mm, and the coil 30 was a conductive wire having a wire diameter of Φ0.1 mm. The distance D1 from the end portion 54 of the magnetic body 50 to the conducting wire 32 of the coil 30 disposed on the second surface 52 is 1 mm, and the distance D1 from the end portion 54 to the conducting wire 32 of the coil 30 disposed on the first surface 51 is set. A three-turn coil 30 was formed with a distance D2 of 8 mm and a distance between the conductors 32 of 0.2 mm. A double-sided tape having a thickness of 20 μm was attached to both surfaces of the magnetic body 50, and the coil 30 was attached thereto to fix the coil.

  As the conductor 20, an aluminum plate of 50 mm × 100 mm × 1 mm was used, and the antenna 2d was attached to the back surface 24 of the conductor 20 (that is, the surface opposite to the surface 22 facing the transmitting device). The antenna 2d was fixed by soldering to an IC tag chip (not shown), and a chip capacitor (not shown) was connected in parallel to adjust the resonance frequency to 14 MHz.

  In this example, when the communication distance with a reader / writer having an antenna diameter of Φ50 mm and a communication frequency of 13.56 MHz was measured, the communication distance was 30 mm.

  For comparison, the characteristics of the conventional antenna 2d shown in FIGS. 28 and 29 were measured as conventional products. The magnetic body 140 is a ferrite sheet having a size of 40 mm × 20 mm × 0.3 mm, the coil 130 uses a conductive wire having a wire diameter of Φ0.1 mm, the coil 130 is disposed on one side of the magnetic body 140, and the end surface of the magnetic body 140 is A 3-turn coil 130 was formed with a distance to the coil 130 of 1 mm and a line-to-line distance of 0.2 mm. The conductor 150 was a 50 mm × 100 mm × 1 mm aluminum plate, and a slit 160 having a width of 1 mm × length of 10 mm was formed on the end face. In this case, when the communication distance was measured under the same conditions as described above, the communication distance was 30 mm. However, when the communication distance was measured without forming a slit, no communication was performed. That is, according to the conventional example, communication cannot be performed without forming a slit or the like.

  Next, measurement was performed using the antenna 2b shown in FIGS. The magnetic body 50 was a ferrite sheet having a size of 50 mm × 15 mm × 0.2 mm, and the coil 30b was formed by bending a planar coil formed on a flexible substrate. The planar coil had an outer shape of 45 × 20 mm, a line width of 0.3 mm, and a line spacing of 0.2 mm. The planar coil was bent at 5 mm from the end face of the coil 30b and attached to the magnetic body 50 with double-sided tape. As the conductor 20, an aluminum plate of 100 mm × 100 mm × 1 mm was used, and the antenna 2b was attached in the vicinity of the end portion 26 of the back surface 24 of the conductor 20. The antenna 2b was connected to a 13.56 MHz communication chip (not shown) via a matching circuit (not shown). When the communication distance was measured in this example, the communication distance with an IC card of size 86 × 54 mm was 30 mm.

1, 1a Electronic equipment 2, 2a, 2b, 2c, 2d Antenna 3 Transmitting equipment 20, 20a Conductor (first conductor)
21 Metal plate 22, 22b Front surface 23 Circuit 24, 24b Back surface 25 Battery 26, 26b End part 30, 30a, 30b, 30c, 30d, 30e Coil 32 Conductor 33, 33b Conductor pattern 34 FPC
35 1st conductor part 36 2nd conductor part 40, 40b Coil surface 41 1st coil surface 42 2nd coil surface 50 Magnetic body 51 1st surface 52 2nd surface 54 End part (specific end part)
55 End portion 56 Recessed portion 60 Magnetic flux line 62, 64 Specific magnetic flux line 70 Extension portion 80 Conductor (second conductor)
82 surface 84 back surface 85 conductor (third conductor)
90, 90a, 90b Portable electronic device 92 Cover 94 Communication circuit 96 Display module 98 Battery 100 unit 102 Case cover 110 Unit 112 Battery 130 Coil 140 Magnetic body 150 Conductor 160 Slit

Claims (10)

An electronic apparatus comprising: a first conductor having a front surface and a back surface opposite to the surface; and a coil formed by winding a conductive wire and having a coil surface surrounded by the wound conductive wire. Because
The front surface is a surface closer to a transmission device including a transmission antenna than the back surface,
The coil captures the specific magnetic flux line by passing through the coil surface a specific magnetic flux line that passes through an end portion of the first conductor among the magnetic flux lines generated by the transmitting antenna and passes through the coil surface. Arranged on the back side so that it can
A magnetic body having a first surface and a second surface opposite to the first surface;
The first surface is a surface closer to the transmitting device than the second surface;
The coil is composed of a conductor pattern formed on an insulating sheet, and is arranged from the first surface to the second surface,
Of the coil surfaces, the area of the first coil surface located on the first surface and the area of the second coil surface located on the second surface are different from each other,
The coil is arranged so as to at least partially cover a specific end that is one end of the magnetic body ,
An electronic device in which an area of the second coil surface is smaller than an area of the first coil surface. The electronic device according to claim 1,
When viewed from the front surface side, the coil is disposed on the back surface side so as not to protrude from the end portion of the first conductor. The electronic device according to claim 2,
The coil is an electronic device disposed in proximity to the end portion of the first conductor. An electronic device according to any one of claims 1 to 3,
An electronic device in which the area of the second coil surface is zero. An electronic device according to any one of claims 1 to 4,
The magnetic material, so that the can and the end portion of the particular end and the first conductor is located on a plane perpendicular to the rear surface, is disposed on the rear surface,
An electronic device in which the conducting wire included in a portion of the coil disposed on the second surface is close to the specific end. An electronic device according to any one of claims 1 to 5,
The magnetic body has an extension where the coil is not arranged,
The extension portion is an electronic device that extends in a direction away from the end portion of the first conductor. The electronic device according to any one of claims 1 to 6,
The first conductor has a recess formed by cutting out a portion including a part of the back surface and a part of the end portion of the first conductor.
The coil is an electronic device disposed in the recess. An electronic device according to any one of claims 1 to 7,
A second conductor;
The coil is disposed so as to be sandwiched between the first conductor and the second conductor,
When viewed from the surface of the first conductor, the second conductor protrudes from the end portion of the first conductor. The electronic device according to claim 8,
An electronic apparatus further comprising a third conductor that faces the end of the first conductor and faces the second conductor and is adjacent to the second conductor.   A method for communicating with a transmitting device by causing the surface of the first conductor of the electronic device according to any one of claims 1 to 9 to face the transmitting device.