JP2013146050A - Antenna device and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna device which achieves good communication characteristics while enabling a housing of an electronic apparatus to be downsized when the antenna device is incorporated in the electronic apparatus.SOLUTION: An antenna device includes: a printed board 10 where a first coil 11 and a second coil 12 are formed; and a magnetic sheet 15 drawing magnetic fields into the first coil 11 and the second coil 12. The first coil 11 receives the magnetic field transmitted from a reader-writer 120, is inductively coupled to the reader-writer 120, and supplies signals to a memory module 132 incorporated in a portable phone 130. The second coil 12 receives the magnetic field transmitted from a transmission coil 221 of a charging device 220, is inductively coupled to the transmission coil 221, and supplies a charging current to a battery pack 133 incorporated in the portable phone 130. The magnetic sheet 15 is laminated on a position that overlaps with the printed board 10.

Description

  The present invention relates to an antenna device incorporated in an electronic device and capable of communicating by receiving a magnetic field transmitted from a transmitter, and an electronic device incorporating the antenna device.

  High-performance portable electronic devices such as smartphones are equipped with short-range wireless communication functions such as RFID (Radio Frequency Identification) (for example, Patent Document 1). Moreover, recently, since the battery life of a smart phone is short, it is necessary to charge frequently, and the non-contact charging function is installed in order to reduce the complexity. For example, a Qi (Qi) standard non-contact charging device using a low frequency of about 110 to 200 kHz has been mounted on a smartphone due to charging efficiency and radio wave law.

JP 2008-35464 A

  Various types of communication antennas, camera modules, and the like are mounted on high-functional portable electronic devices such as smartphones, and new proposals for an efficient mounting method for non-contact charging antennas are desired. In addition, high-functional portable electronic devices are also required to be thin, and a proposal for a thinner antenna module is desired.

  The present invention has been proposed in view of such a situation, and is compatible with a short-range wireless communication function and a non-contact charging function while reducing the size of the casing of the electronic device when incorporated in the electronic device. It is an object of the present invention to provide an antenna device capable of realizing the above and an electronic apparatus incorporating the antenna device.

  In order to solve the above-described problems, an antenna device according to the present invention is an antenna device incorporated in an electronic device, and includes a printed circuit board on which a first coil and a second coil are formed, and a first coil. And a magnetic sheet that draws a magnetic field to the second coil, the first coil receives a magnetic field transmitted from the transmitter, inductively couples with the transmitter, and transmits a signal to a storage medium incorporated in the electronic device. The second coil receives a magnetic field transmitted from the power transmission coil of the charging device, inductively couples with the power transmission coil, supplies a charging current to a battery incorporated in the electronic device, and the magnetic sheet is a printed circuit board. It is laminated at the position superimposed on.

  In addition, the communication device according to the present invention draws a magnetic field into the storage medium, the battery, the printed circuit board on which the first coil and the second coil are formed, and the first coil and the second coil. The first coil receives a magnetic field transmitted from the transmitter, inductively couples with the transmitter, supplies a signal to a storage medium incorporated in the electronic device, and the second coil charges. A magnetic field transmitted from a power transmission coil of the apparatus is received and inductively coupled with the power transmission coil to supply a charging current to a battery incorporated in the electronic device, and the magnetic sheet is laminated at a position superimposed on the printed circuit board. .

  In the present invention, the first coil for realizing the short-range wireless communication function and the second coil for realizing the non-contact charging function are formed on the same printed circuit board. Both the short-range wireless communication function and the non-contact charging function can be realized with a single substrate while downsizing the casing of the electronic device.

1A and 1B are diagrams for explaining the configuration of an antenna module to which the present invention is applied. It is a figure for demonstrating the arrangement | positioning relationship between the printed circuit board and a magnetic sheet in an antenna module. It is a figure for demonstrating the near field communication function in an antenna module. It is a figure for demonstrating the non-contact charge function in an antenna module. FIG. 5A and FIG. 5B are diagrams for explaining the positional relationship between the printed circuit board and the magnetic sheet in the antenna module according to the first modification. FIGS. 6A and 6B are diagrams for explaining the positional relationship between the printed circuit board and the magnetic sheet in the antenna module according to the second modification. FIG. 7A and FIG. 7B are diagrams for explaining the positional relationship between the printed circuit board and the magnetic sheet in the antenna module according to the third modification. FIG. 8A and FIG. 8B are diagrams for explaining the positional relationship between the printed board and the magnetic sheet in the antenna module according to the fourth modification. FIG. 9A and FIG. 9B are diagrams for explaining the positional relationship between the printed circuit board and the magnetic sheet in the antenna module according to the fifth modification. FIG. 10 is a diagram for explaining the positional relationship between the printed circuit board and the magnetic sheet in the antenna module according to the sixth modification. It is a top view which shows the further another modification of the antenna module to which this invention was applied. It is a top view which shows the further another modification of the antenna module to which this invention was applied. It is a top view which shows the further another modification of the antenna module to which this invention was applied. It is a top view which shows the further another modification of the antenna module to which this invention was applied. It is a top view which shows the further another modification of the antenna module to which this invention was applied. It is a top view which shows the further another modification of the antenna module to which this invention was applied. It is a top view which shows the further another modification of the antenna module to which this invention was applied.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. It should be noted that the present invention is not limited to the following embodiments, and various modifications can be made without departing from the scope of the present invention.

  An antenna device to which the present invention is applied is incorporated in an electronic device and realizes both a short-range wireless communication function and a non-contact charging function. Specifically, an antenna module 1a, which is an antenna device to which the present invention is applied, has a first RFID (Radio Frequency Identification) for short-range wireless communication on a printed circuit board 10 as shown in FIG. One coil 11 and a second coil 12 for receiving power of, for example, a Qi standard non-contact charging function are formed.

  The first coil 11 has terminals 11a and 11b formed at both ends thereof.

  The second coil 12 has terminals 12a and 12b formed at both ends thereof.

  Further, a first opening 13 is formed in the central portion of the first coil 11 in the printed circuit board 10, and the second opening 14 is provided between the first coil 11 and the second coil 12. Is formed.

  Further, since the antenna module 1a draws a magnetic field into the first coil 11 and the second coil 12, for example, a magnetic sheet 15 as shown in FIG. For example, as will be described later, when the first coil 11 is disposed on the outer peripheral portion of the housing of the electronic device, in order to efficiently draw the magnetic field from the reader / writer into the first coil 11, as shown in FIG. The magnetic sheet 15 is inserted into the first opening 13 and the second opening 14. Specifically, by inserting the magnetic sheet 15 into the first opening 13 and the second opening 14, the magnetic sheet 15 is interposed between the first opening 13 and the second opening 14. It is arranged closer to the reader / writer 120, which will be described later, which is an RFID transmitter than the first coil 11. Further, except between the first opening 13 and the second opening 14, the first coil 11 is disposed on the reader / writer 120 side and the second coil 12 has a non-contact charging function described later. Arranged on the charging device 220 side.

  Next, the short-range wireless communication function by the first coil 11 will be described. For example, as shown in FIG. 3, the antenna module 1 a is incorporated into, for example, the housing 131 of the mobile phone 130, and the first coil 11 is used as a radio communication system 100 for RFID (Radio Frequency Identification).

  In the wireless communication system 100, the reader / writer 120 accesses the memory module 132 incorporated in the mobile phone 130 together with the antenna module 1a. Here, it is assumed that the first coil 11 and the reader / writer 120 are arranged to face each other in the xy plane of the three-dimensional orthogonal coordinate system xyz.

  The reader / writer 120 functions as a transmitter that transmits a magnetic field in the z-axis direction to the first coils 11 of the antenna modules 1 a facing each other in the xy plane. Specifically, the reader / writer 120 is directed toward the first coil 11. An antenna 121 for transmitting a magnetic field and a control board 122 for communicating with the memory module 132.

  That is, the reader / writer 120 is provided with a control board 122 that is electrically connected to the antenna 121. A control circuit made of electronic components such as one or a plurality of integrated circuit chips is mounted on the control board 122. The control circuit executes various processes based on data received from the memory module 132 via the first coil 11. For example, when transmitting data to the memory module 132, the control circuit encodes the data, modulates a carrier wave of a predetermined frequency (for example, 13.56 MHz) based on the encoded data, and modulates the modulation. The signal is amplified, and the antenna 121 is driven by the amplified modulation signal. When reading data from the memory module 132, the control circuit amplifies the modulation signal of the data received by the antenna 121, demodulates the modulation signal of the amplified data, and decodes the demodulated data. In the control circuit, a coding method and a modulation method used in a general reader / writer are used. For example, a Manchester coding method or an ASK (Amplitude Shift Keying) modulation method is used.

  In the antenna module 1 a, the first coil 11 receives a magnetic field transmitted from the reader / writer 120 and inductively couples with the reader / writer 120, and supplies a signal to the memory module 132 that is a storage medium incorporated in the mobile phone 130. .

  When the first coil 11 receives a magnetic field transmitted from the reader / writer 120, the first coil 11 is magnetically coupled to the reader / writer 120 by inductive coupling, receives the modulated electromagnetic wave, and receives a received signal via the terminals 11a and 11b. Is supplied to the memory module 132.

  The memory module 132 is driven by a current flowing through the first coil 11 and communicates with the reader / writer 120. Specifically, the memory module 132 demodulates the received modulation signal, decodes the demodulated data, and writes the decoded data to the internal memory of the memory module 132. The memory module 132 reads data to be transmitted to the reader / writer 120 from the internal memory, encodes the read data, modulates a carrier wave based on the encoded data, and is magnetically coupled by inductive coupling. The modulated radio wave is transmitted to the reader / writer 120 via the coil 11.

  Next, the non-contact charging function by the second coil 12 will be described. For example, as shown in FIG. 4, the second coil 12 is used as a Qi standard non-contact charging system 200, for example.

  The non-contact charging system 200 charges the battery pack 133 connected to the second coil 12 of the antenna module 1a by the charging device 220. Here, the second coil 12 of the antenna module 1a and the power transmission coil 221 of the charging device 220 are similar to the positional relationship between the first coil 11 and the reader / writer 120 described above, and xy of the three-dimensional orthogonal coordinate system xyz. It is assumed that they are arranged so as to face each other on a plane.

  The charging device 220 functions as a power transmission unit that transmits a magnetic field in the z-axis direction to the second coils 12 of the antenna module 1a facing each other in the xy plane, and specifically, toward the second coil 12. A power transmission coil 221 that transmits a magnetic field, and a power transmission control board 222 that controls supply of power to the second coil 12 that is inductively coupled via the power transmission coil 221.

  That is, the charging device 220 is provided with a power transmission control board 222 that is electrically connected to the power transmission coil 221. On the power transmission control board 222, a control circuit made of electronic components such as one or a plurality of integrated circuit chips is mounted. This control circuit supplies a charging current to the second coil 12 that is inductively coupled to the power transmission coil 221. Specifically, the power transmission control board 222 drives the power transmission coil 221 with a power transmission current having a predetermined frequency, for example, a relatively low frequency of 110 KHz.

  As described above, the antenna module 1a is incorporated in the housing 131 of the mobile phone 130, and the second coil 12 receives the magnetic field transmitted from the power transmission coil 221 and inductively couples with the power transmission coil 221 to The received current is supplied to the battery pack 133 incorporated in 130.

  When the second coil 12 receives a magnetic field transmitted from the charging device 220, the second coil 12 is magnetically coupled to the charging device 220 by inductive coupling, receives the modulated electromagnetic wave, and receives a charging current via the terminals 12a and 12b. Is supplied to the battery pack 133.

  The battery pack 133 applies a charging voltage corresponding to the charging current flowing through the second coil 12 to the battery cells inside the battery pack 133.

  As described above, in the antenna module 1a, the first coil 11 that realizes the short-range wireless communication function and the second coil 12 that realizes the non-contact charging function are formed on the same plane of the same printed circuit board 10. Therefore, it is possible to realize both the short-range wireless communication function and the non-contact charging function while reducing the size of the housing 131 when incorporated in the mobile phone 130 which is an electronic device.

  Further, the magnetic sheet 15 is superimposed on the printed circuit board 10 so as to efficiently draw the magnetic fields transmitted from the reader / writer 120 and the charging device 220 into the first coil 11 and the second coil 12, respectively. In particular, the magnetic sheet 15 is inserted into the first opening 13 and the second opening 14 as described above, so that the space of the casing 131 of the mobile phone 130 can be efficiently used and a good short distance can be obtained. Wireless communication characteristics can be realized.

  Specifically, by inserting the magnetic sheet 15 into the printed circuit board 10, the magnetic sheet 15 is placed between the first opening 13 and the second opening 14 more than the first coil 11. It is arranged on the 120 side. Further, except between the first opening 13 and the second opening 14, the first coil 11 is disposed on the reader / writer 120 side and the second coil 12 is disposed on the charging device 220 side. .

  Such an arrangement condition can be easily realized by inserting one magnetic sheet 15 into the first opening 13 and the second opening 14. Furthermore, the antenna module 1a can obtain good communication characteristics and charging characteristics for the following reasons.

  That is, in the first coil 11 that realizes the short-range wireless communication function, in particular, the magnetic flux oriented by the casing surface of the mobile phone 130 facing the reader / writer 120 is guided to the first opening 13 by the magnetic sheet 15. Good communication characteristics can be obtained. On the other hand, the second coil 12 that realizes the non-contact power feeding function preferably has a large size because a relatively large current flows. Therefore, it is necessary to arrange the second coil 12 at a position overlapping the metal plate in the housing 131. Despite this necessity, the second coil 12 prevents the magnetic flux from rebounding due to the influence of the metal plate mounted inside the mobile phone 130 by the magnetic sheet 15 being superimposed. The battery pack 133 can be installed on a metal-containing component. Therefore, the 2nd coil 12 can aim at coexistence with a favorable charging characteristic and the freedom degree of arrangement | positioning, when the magnetic sheet 15 is superimposed.

  For example, as a first modification, as shown in FIGS. 5A and 5B, a metal member, for example, a battery pack 133 is disposed on a surface 1a2 opposite to the surface 1a1 on which the antenna module 1a receives a magnetic field. In this case, in the outer peripheral portion 130a in the vicinity of the outer peripheral wall 134 of the casing 131 of the mobile phone 130, the magnetic field transmitted from the reader / writer 120 toward the z-axis direction is oriented in the xy plane direction. In order to efficiently draw the magnetic field B oriented in the xy plane direction in this way, the first coil 11 is closer to the reader / writer 120 side than the magnetic sheet 15 from the outer peripheral portion 130a to the first opening portion 13. It is preferable to satisfy the condition that the magnetic sheet 15 is positioned closer to the reader / writer 120 than the first coil 11 from the first opening 13 to the second opening 14. The antenna module 1a satisfies this condition by inserting the magnetic sheet 15 into the printed circuit board 10 as described above.

  As a second modification, as shown in FIGS. 6 (A) and 6 (B), the magnetic sheet 15 has a thickness of a portion 152 of the magnetic sheet 15 that overlaps the second coil 12. It is particularly preferable that the layer thickness be greater than the thickness of the portion 151 overlapping the first coil 11.

  Here, in non-contact charging, a relatively large current flows through the second coil 12 to the first coil 11 in order to transmit several watts of power. Therefore, the magnetic core in which the magnetic sheet 15 plays a role may be saturated. As a countermeasure, it is effective to prevent the magnetic saturation by thickening the magnetic core, that is, the portion 152 of the magnetic sheet 15, and it is preferable to adjust the thickness of the sheet as described above. Further, the thickness of the portion 151 overlapping the first coil 11 is determined from the viewpoint of making it easy to insert the magnetic sheet into the openings 13 and 14 and from the viewpoint of ensuring the physical strength by making the openings 13 and 14 as small as possible. The thickness of the portion 152 is preferably smaller.

  In addition, the width | variety prescribed | regulated in the direction orthogonal to the insertion direction of the magnetic sheet 15, ie, an x-axis direction, does not necessarily need to be uniform. For example, as a third modification, as shown in FIG. 7, when the magnetic sheet 15 is inserted into the printed circuit board 10, the width of the region 15 a from the outer peripheral portion 130 a to the first opening portion 13 is set to the other region. It may be wider than the width of 15b. In the case shown in FIG. 7, the portion of the magnetic sheet 15 that overlaps the first coil 11 can be made large, which is particularly preferable in terms of improving communication characteristics.

  Further, for example, as a fourth modification, as shown in FIG. 8, when the magnetic sheet 15 is inserted into the printed circuit board 10, the magnetic sheet 15 is larger than the width of the region 15 a from the outer peripheral portion 130 a to the first opening portion 13. Other regions 15b may be wider. Furthermore, as a fifth modification, as shown in FIG. 9, the width of the second opening 14 is made wider than the width of the first opening 13, and the second opening 14 extends from the first opening 13. You may make it change the width | variety of the magnetic sheet 15 inserted over the part 14. FIG. In the case shown in FIGS. 8 and 9, the magnetic sheet 15 is inserted in the order of the opening portion 14 and the opening portion 13, which is preferable from the viewpoint of ease of insertion, and overlaps with the second coil 12 as described above. It is particularly preferable when the thickness of the portion 152 to be formed is greater than the thickness of the portion 151 overlapping the first coil 11.

  In addition, as described above, in non-contact charging, since the second coil 12 transmits a larger current than the first coil 11 in order to transmit several watts of power, the magnetic flux can be generated with lower loss. Retraction is required. For this reason, the second coil 12 preferably has a larger coil outer area than the first coil 11. Furthermore, the widths of the first coil 11 and the second coil 12, that is, the widths defined in the x-axis direction do not necessarily match. For example, as a sixth modification, as shown in FIG. The width of the second coil 12 may be wider than the width of the first coil 11.

  The first coil 11 and the second coil 12 are not necessarily formed on the same surface of the printed circuit board 10. For example, each coil is independent of the upper surface and the lower surface of the printed circuit board 10. May be formed.

[Other variations]
The antenna module 1a, which is an antenna device to which the present invention is applied, includes terminals 11a and 11b formed at both ends of the first coil 11, and terminals 12a and 12b formed at both ends of the second coil 12. You may form at least 1 in the surface on the opposite side to the surface in which the 1st coil 11 and the 2nd coil 12 of the printed circuit board 10 were formed.

  As shown in FIG. 11, the antenna module 1a has a first coil 11 formed on the first surface 10a of the printed circuit board 10, and a terminal on the second surface 10b, which is a surface facing the reader / writer 120 during communication. 11a and 11b are formed. The terminal 11 a is electrically connected to the outermost end portion of the first coil 11 formed on the first surface 10 a through the through hole 22. Further, the terminal 11b is electrically connected to the innermost peripheral end of the first coil 11 formed on the first surface 10a through the through hole 22 and the extraction coil 23.

  Similarly, in the antenna module 1a, the second coil 12 is formed on the first surface 10a of the printed circuit board 10, and the terminals 12a and 12b are formed on the second surface 10b. The terminal 12 a is electrically connected to the outermost peripheral end of the second coil 12 formed on the first surface 10 a via the through hole 22. Further, the terminal 12b is electrically connected to the innermost peripheral end of the second coil 12 formed on the first surface 10a, through the through hole 22 and the extraction coil 23.

  Each through hole 22 has a conductive layer formed therein by plating or filling with a conductive paste. Each extraction coil 23 is provided between the through hole 22 facing the second surface 10b and the terminal 11b or 12b, and is formed, for example, by patterning a copper foil.

  As described above, the antenna module 1a has the terminals 11a, 11b, 12a, and 12b of the first and second coils 11 and 12 formed on the second surface 10b through the through holes 22 and the extraction coil 23. Can be placed anywhere. Therefore, when the antenna module 1a is incorporated in an electronic device, the terminals 11a, 11b, 12a, and 12b can be formed at positions that are optimal for connection to the terminal on the electronic device side.

  In FIG. 11, both terminals 11 a and 11 b are juxtaposed at positions where they overlap with the first coil 11. Similarly, both terminals 12 a and 12 b are arranged side by side at a position overlapping the second coil 12. Further, all the terminals 11 a, 11 b, 12 a, and 12 b are arranged in parallel at positions close to each other along the outer edge of the printed circuit board 10.

  Thus, the antenna module 1a has the terminals 11a, 11b, 12a, and 12b of the first and second coils 11 and 12 gathered at positions close to each other. Space-saving and easy assembly can be achieved without connecting members to the terminals 11a, 11b, 12a, and 12b in the device casing.

  Further, when the first and second coils 11 and 12 and the terminals 11a, 11b, 12a, and 12b are formed on the first surface 10a of the printed circuit board 10 (see FIG. 1A), a terminal space is secured. In order to achieve this, it is necessary to reduce the line width of the coil. As a result, the resistance value increases and the Q value may be deteriorated. On the other hand, when the terminals 11a, 11b, 12a, and 12b are formed on different surfaces from the first and second coils 11 and 12, the line width of the coils can be the same across the entire length, This is also advantageous in terms of communication characteristics.

  In addition, the antenna module 1a forms all terminals 11a, 11b, 12a, and 12b on the second surface 10b of the printed circuit board 10, and only the arbitrary terminals according to the arrangement of the terminals on the electronic device side on the second surface. 10b may be formed.

  In addition, as shown in FIG. 12, the antenna module 1 a overlaps the terminals 11 a, 11 b, 12 a, and 12 b formed on the second surface 10 b of the printed circuit board 10 with the first and second coils 11 and 12. You may provide in the position which does not. The printed circuit board 10 is provided with a protruding portion 16 on one side surface, and all the terminals 11a, 11b, 12a, and 12b are formed on the protruding portion 16. In this case, all the terminals 11a, 11b, 12a, and 12b are all connected through the through-hole 22 and the extraction coil 23 that face the second surface 10b.

  The overhanging portion 16 in which the terminals 11a, 11b, 12a, and 12b are formed can be provided at any position according to the position of the connection terminal on the electronic device side, and the shape is also free. That is, according to the antenna module 1a shown in FIG. 12, the terminals 11a, 11b, 12a, and 12b of the antenna module 1a are arranged at optimum positions according to the positions of the connection terminals on the electronic device side and the connection terminals of other components. It is possible to increase the degree of freedom of arrangement design.

  In the antenna module 1a shown in FIG. 12, all terminals 11a, 11b, 12a, and 12b are formed on the overhanging portion 16 and are assembled at positions close to each other by being arranged in parallel. In addition, the connection members with the terminals 11a, 11b, 12a, and 12b are not dispersed in the device casing, and space saving and assembly can be facilitated.

  In addition, in the antenna module 1a shown in FIG. 12, all the terminals 11a, 11b, 12a, and 12b are formed on the overhanging portion 16, and only arbitrary terminals are formed according to the arrangement of the terminals on the electronic device side. You may form in.

  As shown in FIG. 13, the antenna module 1a includes a first overhanging portion 16a in which the terminals 11a and 11b are formed, and a second overhanging portion 16b in which the terminals 12a and 12b are formed. May be. By separating the terminals 11a and 11b of the first coil 11 for RFID and the terminals 12a and 12b of the second coil 12 for receiving power with a non-contact charging function, connection terminals and other configurations on the electronic device side are separated. Each terminal can be arranged according to the arrangement of the connection terminals of the members.

  That is, even when the position of the RFID terminal on the electronic device side and the position of the contactless charging terminal are separated, the antenna module 1a shown in FIG. By providing the overhang portion 16a and the second overhang portion 16b, the degree of freedom in arrangement can be increased.

  The antenna module 1a is provided in the first overhanging portion 16a by separately providing the first overhanging portion 16a and the second overhanging portion 16b and bending them to an arbitrary height. It is also possible to change the height of each connection position between the terminals 11a and 11b and the terminals 12a and 12b provided on the second overhanging portion 16b. Further, the terminals 11a and 11b provided in the first overhanging portion 16a and the terminals 12a and 12b provided in the second overhanging portion 16b are mutually the first and second overhanging portions 16a and 16b. May be formed on the same surface side, or may be formed on different surface sides. When the terminal is formed on the first surface 10a side of the printed circuit board 10, a through hole 22 continuous with the extraction coil 23 is formed in the first overhanging portion 16a or the second overhanging portion 16b. It connects with the terminal of the surface 10a side.

  Note that the connection between the first coil 11 and the terminals 11a and 11b and the connection between the second coil 12 and the terminals 12a and 12b are the same in that the through-hole 22 and the extraction coil 23 are used.

  As shown in FIG. 14, the antenna module 1a includes terminals 11a and 11b of the first coil 11, and terminals 12a and 12b of the second coil 12, and one coil on the second surface 10b, for example, You may form in the position which overlaps with the 2nd coil 12. FIG. Since the first coil 11 for RFID receives a weak magnetic field as compared with the second coil 12 for non-contact charging, terminals 11 a and 11 b are provided at positions overlapping the first coil 11. As a result, the coil surface may be blocked and communication characteristics may deteriorate. Therefore, by removing the terminals 11a and 11b from the position where they overlap with the first coil 11, it is possible to prevent deterioration of communication characteristics due to the overlap between the first coil 11 and the terminals 11a and 11b.

  Note that the connection between the first coil 11 and the terminals 11a and 11b and the connection between the second coil 12 and the terminals 12a and 12b are the same in that the through-hole 22 and the extraction coil 23 are used.

  Further, as shown in FIG. 15, the antenna module 1a includes the terminals 11a and 11b of the first coil 11 and the terminals 12a and 12b of the second coil 12 from the position shown in FIG. You may arrange | position to the overhang | projection part 16 side provided in the position which does not overlap with 12. FIG. In other words, the overhanging portion 16 shown in FIG. 12 may be formed close to the second coil 12 side. In this way, by arranging all the terminals at positions that do not overlap with the first and second coils, each terminal can be prevented from blocking the coil surfaces of the first and second coils 11 and 12.

  In the configuration shown in FIG. 15 as well, a first overhanging portion 16a in which the terminals 11a and 11b are formed and a second overhanging portion 16b in which the terminals 12a and 12b are formed may be provided. Moreover, while providing the 1st overhang | projection part 16a and the 2nd overhang | projection part 16b separately, and bending each to arbitrary height, the terminal 11a, 11b provided in the 1st overhang | projection part 16a And the height of each connection position with terminal 12a, 12b provided in the 2nd overhang | projection part 16b can also be changed. Further, the terminals 11a and 11b provided in the first overhanging portion 16a and the terminals 12a and 12b provided in the second overhanging portion 16b are mutually the first and second overhanging portions 16a and 15b. May be formed on the same surface side, or may be formed on different surface sides.

  Note that the connection between the first coil 11 and the terminals 11a and 11b and the connection between the second coil 12 and the terminals 12a and 12b are the same in that the through-hole 22 and the extraction coil 23 are used.

  In the antenna module 1a, the first coil 11 and the second coil 12 may be provided on different surfaces of the printed circuit board 10. For example, as shown in FIG. 16, in the antenna module 1a, the first coil 11 for RFID is formed on the first surface 10a of the printed circuit board 10, and the terminals 11a and 11b are formed on the second surface 10b. Alternatively, the second coil 12 for non-contact charging may be formed on the second surface 10b, and the terminals 12a and 12b may be formed on the first surface 10a.

  In the antenna module 1a shown in FIG. 16, the terminals 11a and 11b of the first coil 11 are formed at positions overlapping the first coil 11, and the terminals 12a and 12b of the second coil 12 are the second coils. 12 is formed at a position overlapping with 12.

  Note that the connection between the first coil 11 and the terminals 11a and 11b and the connection between the second coil 12 and the terminals 12a and 12b are the same in that the through-hole 22 and the extraction coil 23 are used.

  In the antenna module 1a, the first coil 11 and the second coil 12 are provided on different surfaces of the printed circuit board 10, and the terminals 11a, 11b, 12a, and 12b are formed at positions that overlap with one coil. May be. For example, as shown in FIG. 17, the first coil 11 is formed on the first surface 10a of the printed circuit board 10, and the second coil 12 is formed on the second surface 10b.

  As for the 1st coil 11, the terminal 11a is formed in the 1st surface 10a via the extraction coil 23 formed from the outer peripheral side edge part. The first coil 11 is provided with a through hole 22 at an inner peripheral end, a lead coil 23 is formed from the through hole 22 to the second surface 10 b, and the through hole 22 is formed from the end of the lead coil 23. Thus, the terminal 11b is formed on the first surface 10a. Each of the terminals 11a and 11b is formed at a position overlapping the second coil 12 formed on the second surface 10b.

  Further, the terminals 12 a and 12 b of the second coil 12 are formed at positions where the second coil 12 is superimposed on the first surface 10 a by the through hole 22 and the extraction coil 23. Further, the terminals 11 a, 11 b, 12 a, 12 b are provided in parallel along the outer edge of the printed circuit board 10.

  In the antenna module 1a shown in FIG. 17 as well, the terminals 11a and 11b are formed at positions removed from the positions where they overlap with the first coil 11, so that the first coil 11 and the terminals 11a and 11b overlap. It is possible to prevent deterioration of communication characteristics due to the above.

  In the antenna module 1 a shown in FIGS. 11 to 17 described above, the magnetic sheet 15 may be inserted into the first opening 13 and the second opening 14.

  1a antenna module, 1a1, 1a2 plane, 10 printed circuit board, 11 first coil, 11a, 11b, 12a, 12b terminal, 12 second coil, 13, 14 opening, 15 magnetic sheet, 15a, 15b region, 16 Overhang part, 16a First overhang part, 16b Second overhang part, 22 Through hole, 23 Lead coil, 151, 152 part, 100 Wireless communication system, 120 Reader / writer, 121 Antenna, 122 Control board, 130 Mobile phone, 130a outer peripheral part, 131 housing, 132 memory module, 133 battery pack, 134 outer peripheral wall, 151, 152 part, 200 non-contact charging system, 220 charging device, 221 power transmission coil, 222 power transmission control board

Claims (9)

In an antenna device incorporated in an electronic device,
A printed circuit board on which a first coil and a second coil are formed;
A magnetic sheet for drawing a magnetic field into the first coil and the second coil;
The first coil receives a magnetic field transmitted from a transmitter, inductively couples with the transmitter, and supplies a signal to a storage medium incorporated in the electronic device,
The second coil receives a magnetic field transmitted from a power transmission coil of the charging device, inductively couples with the power transmission coil, and supplies a charging current to a battery incorporated in the electronic device,
The antenna device, wherein the magnetic sheet is laminated at a position superimposed on first and second coils formed on the printed circuit board. The printed circuit board has a first opening located in a central portion of the first coil, and a second opening located between the first coil and the second coil,
By inserting the magnetic sheet into the first opening and the second opening, the magnetic sheet is interposed between the first opening and the second opening. The first coil is disposed on the transmitter side of the magnetic sheet except for the area between the first opening and the second opening, and the first coil is disposed on the transmitter side of the magnetic sheet. 2 coils are arranged on the charging device side,
The antenna device according to claim 1, wherein the first coil is disposed in proximity to an outer peripheral portion of the electronic device casing.   2. The antenna device according to claim 1, wherein a thickness of a portion of the magnetic sheet that overlaps the second coil is greater than a thickness of a portion that overlaps the first coil. Each of the first coil and the second coil includes terminals for inputting and outputting signals or currents at both ends,
At least 1 of the said terminals is formed in the surface on the opposite side to the surface in which the said 1st coil and the said 2nd coil of the said printed circuit board were formed in any one of Claims 1-3. The antenna device described.   The antenna device according to claim 4, wherein at least one of the terminals is formed at a position not overlapping with the first coil and the second coil. A storage medium;
Battery,
A printed circuit board on which a first coil and a second coil are formed;
A magnetic sheet for drawing a magnetic field into the first coil and the second coil;
The first coil receives a magnetic field transmitted from a transmitter, inductively couples with the transmitter, and supplies a signal to a storage medium incorporated in the electronic device,
The second coil receives a magnetic field transmitted from a power transmission coil of the charging device, inductively couples with the power transmission coil, and supplies a charging current to a battery incorporated in the electronic device,
An electronic apparatus in which the magnetic sheet is laminated at a position superimposed on the printed circuit board. The printed circuit board has a first opening located in a central portion of the first coil, and a second opening located between the first coil and the second coil,
By inserting the magnetic sheet into the first opening and the second opening, the magnetic sheet is interposed between the first opening and the second opening. The first coil is disposed on the transmitter side and the second coil is disposed at a position closer to the transmitter than the coil, except for between the first opening and the second opening. Arranged on the charging device side,
The electronic device according to claim 6, wherein the first coil is disposed in proximity to an outer peripheral portion of the electronic device casing. Each of the first coil and the second coil includes terminals for inputting and outputting signals or currents at both ends,
8. The electron according to claim 6, wherein at least one of the terminals is formed on a surface of the printed circuit board opposite to a surface on which the first coil and the second coil are formed. machine.   The electronic device according to claim 8, wherein at least one of the terminals is formed at a position that does not overlap the first coil and the second coil.

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