JP5602065B2 - Non-contact power transmission device - Google Patents

Description

  The present invention relates to a non-contact power transmission apparatus including an antenna that performs at least one of power transmission and reception by electromagnetic resonance with another antenna disposed on the front side.

  As this type of non-contact power transmission device, a non-contact power feeding system (non-contact power transmission device) disclosed in Patent Document 1 below is known. The non-contact power feeding system includes a power feeding device and an electric vehicle that receives power supplied from the power feeding device. The power supply apparatus includes an AC power supply, a high frequency power driver, a primary coil, a primary self-resonant coil, and a shield box. On the other hand, the electric vehicle includes a secondary self-resonant coil, a secondary coil, a shield box, a rectifier, a DC / DC converter, and a power storage device.

  In this non-contact power feeding system, an AC power source of a power feeding device feeds high-frequency power of 1 M to 10 and several MHz through a primary coil to a primary self-resonant coil that is magnetically coupled to the primary coil by electromagnetic induction. The primary self-resonant coil is an LC resonator having an inductance and stray capacitance of the coil itself, and resonates with a secondary self-resonant coil having the same resonance frequency as the primary self-resonant coil through an electromagnetic field (near field). Thereby, energy (electric power) moves from the primary self-resonant coil to the secondary self-resonant coil via the electromagnetic field. In the electric vehicle, the energy (electric power) moved to the secondary self-resonant coil is taken out via the secondary coil that is magnetically coupled to the secondary self-resonant coil by electromagnetic induction and supplied to the load.

  Further, in this non-contact power feeding system, the primary coil and the primary self-resonant coil of the power feeding device, and the secondary coil and the secondary self-resonant coil of the electric vehicle are each stored in a shield box opened in only one direction, It arrange | positions so that it may oppose through the opening part of each shield box. With this configuration, in this non-contact power feeding system, in the case of non-contact power transmission using the resonance method, the leakage electromagnetic field generated around each self-resonant coil without interfering with power transmission by the power feeding device and power reception by the electric vehicle. Can be shielded by a shield box.

JP 2010-70048 (page 5-8, FIGS. 1 and 4)

  However, the following non-contact power transmission devices have the following problems to be solved. That is, this non-contact power transmission apparatus employs a configuration in which the self-resonant coils are respectively stored (entirely stored) in a shield box that is open in only one direction. For this reason, in this non-contact power transmission device, although the leakage electromagnetic field generated around the self-resonant coil can be suppressed very well, it is generated around each self-resonant coil during power transmission and power reception. Since the resonant electromagnetic field is strongly influenced by the shield box, there is a problem to be solved that it is difficult to further improve the power transmission efficiency.

  The present invention has been made to solve such a problem, and a main object of the present invention is to provide a non-contact power transmission apparatus capable of further improving transmission efficiency while sufficiently suppressing a leakage electromagnetic field.

  In order to achieve the above object, the contactless power transmission device according to claim 1, wherein one antenna that performs at least one of power transmission and reception with another antenna disposed on the front side in a contactless manner, An electromagnetic shield member, and the one antenna is a non-contact power transmission device disposed so that the electromagnetic shield member is positioned on a back side, wherein the electromagnetic shield member includes the one antenna. A plate-like base portion having a width including the whole of the one antenna in a front view as viewed from the front side, and toward the one antenna side from the edge portion of the base portion to the entire edge portion. A space formed by the base portion and the side wall of the electromagnetic shield member. Inside It does not enter, and are disposed in close proximity to the electromagnetic shield member.

  The contactless power transmission device according to claim 2 is the contactless power transmission device according to claim 1, wherein the electromagnetic shield member is made of a metal material and is connected to the one antenna. A component is attached, and it also functions as a radiator of the electronic component.

  According to a third aspect of the present invention, there is provided the non-contact power transmission device according to the first or second aspect, wherein the other antenna disposed so that another electromagnetic shield member is positioned on the back side. The other electromagnetic shield member includes a plate-like base portion having a width including the whole of the other antenna in a front view when the other antenna is viewed from the front side, and an edge of the base portion. A side wall erected toward the other antenna side over the entire edge, and is formed in a box shape having an opening facing the other antenna. The electromagnetic shield member is disposed so as not to enter the space formed by the base portion and the side wall and in the vicinity of the other electromagnetic shield member.

  According to a fourth aspect of the present invention, in the non-contact power transmission device according to the third aspect, the other electromagnetic shield member is made of a metal material and is connected to the other antenna. The electronic component is attached and functions also as a radiator of the electronic component.

  2. The non-contact power transmission device according to claim 1, wherein one antenna is wide enough to include the whole antenna when viewed from the front, the box-shaped electromagnetic shield member is located on the back side, and the electromagnetic shield member. It is arrange | positioned in the state which adjoined.

  Therefore, according to this non-contact power transmission apparatus, even if one antenna is not housed in the electromagnetic shield member, the leakage electromagnetic field generated around the one antenna is prevented from being generated at the base portion of the electromagnetic shield member. And can be effectively shielded by the side walls. In addition, according to the non-contact power transmission device, the configuration in which one antenna does not enter the space of the electromagnetic shield member, that is, the configuration in which the entire antenna is located outside the electromagnetic shield member, Compared with the configuration stored in the antenna, it is possible to reliably prevent power transmission or reception from one antenna to another antenna from being affected by the electromagnetic shield member, resulting in efficient power transmission or Power can be received.

  According to the non-contact power transmission device according to claim 2, the electronic component is attached to an electromagnetic shield member having a wide thermal conductivity by including a metal material and including an entire antenna. As a result, the electromagnetic shield member functions as a good radiator for the electronic component, and the electronic component can be efficiently cooled. As a result, the reliability of the non-contact power transmission device can be increased.

  The non-contact power transmission device according to claim 3, wherein the other antenna disposed on the front side of the one antenna has a width including the whole of the other antenna when viewed from the front, and is another electromagnetic box. The shield member is located on the back side and is disposed in the vicinity of the other electromagnetic shield member.

  Therefore, according to this non-contact power transmission apparatus, even if the other antenna is not stored in the other electromagnetic shield member, the leakage electromagnetic field generated around the other antenna is prevented from being generated by the other electromagnetic shield. It can shield effectively by the base part and side wall of a member. Further, according to this non-contact power transmission device, the other antenna does not enter the space of the other electromagnetic shield member, that is, the other antenna is entirely located outside the other electromagnetic shield member. Compared with the configuration stored in the space of the electromagnetic shield member, it is possible to reliably avoid the power transmission or reception of power from one antenna to another antenna from being affected by the other electromagnetic shield member. As a result, efficient power transmission or power reception can be performed.

  According to the non-contact power transmission device according to claim 4, an electronic component is formed on another electromagnetic shield member having a high thermal conductivity by being configured using a metal material and having a width including the whole of another antenna. Since the other electromagnetic shield member functions as a good heat radiator for the electronic component, the electronic component can be efficiently cooled. As a result, the reliability of the non-contact power transmission device can be further improved.

1 is a block diagram of a non-contact power transmission device 1. FIG. 3 is a front view for explaining the configuration of a transmission antenna 12 and a shield member 14 of a power transmission device 2 and a reception antenna 21 and a shield member 24 of a power reception device 3. FIG. It is the WW sectional view taken on the line in FIG. 2 (The 2nd matching part 22 and the rectification | straightening part 23 are non-cross-sectional states). 4 is a perspective view for explaining the configuration of a transmission antenna 12 and a shield member 14 of the power transmission device 2 and a reception antenna 21 and a shield member 24 of the power reception device 3. FIG.

  Hereinafter, embodiments of a non-contact power transmission device will be described with reference to the accompanying drawings.

  A non-contact power transmission device 1 shown in FIG. 1 includes a power transmission device 2, a power reception device 3, and a battery 4, and transmits power from the power transmission device 2 to the power reception device 3 in a contactless manner. The battery 4 receives power and supplies power to the battery 4.

  The power transmission device 2 includes a signal generation unit 11, a transmission antenna 12, a first matching unit 13, and an electromagnetic shield member 14 (hereinafter also referred to as “shield member 14”).

  The signal generator 11 generates and outputs an AC signal S1. As shown in FIGS. 2, 3, and 4, the transmission antenna 12 has a planar coil shape formed by winding an electric wire 12 a (see FIG. 3) a plurality of times (as shown in FIG. 2 as an example). Of a flat coil shape). The transmitting antenna 12 is not limited to a planar coil shape, and various shapes such as a coil spring shape can be employed. Moreover, the ring shape comprised by winding an electric wire 1 turn is also employable. In addition, the transmission antenna 12 is electromagnetically coupled to a later-described reception antenna 21 provided in the power receiving device 3. Specifically, the transmitting antenna 12 forms a pair of resonators (a pair of self-resonant coils) together with the receiving antenna 21, and resonates in an electromagnetic field. In addition, when one of these is the one antenna, the transmitting antenna 12 and the receiving antenna 21 have a relationship in which the remaining antennas are other antennas arranged on the front side of the one antenna. In this case, the “front surface of the antenna” means a surface parallel to a virtual plane including the antenna when the antenna is a planar coil shape and facing the other antenna, and when the antenna is a coil spring shape, It means a plane parallel to a virtual plane orthogonal to the antenna axis and facing the other antenna.

  The first matching unit 13 is disposed between the signal generation unit 11 and the transmission antenna 12 (specifically, is interposed in a transmission path (not shown) that connects the signal generation unit 11 and the transmission antenna 12). And matching the impedance on the signal generating unit 11 side with the impedance (input impedance) of the transmitting antenna 12 that changes according to the distance to the receiving antenna 21 (the signal generating unit 11 and the transmitting antenna 12 are in a matched state). Migrate). For example, the first matching unit 13 includes a variable capacitor (not shown) connected in parallel to the transmission antenna 12 and a series circuit with respect to the transmission antenna 12 (that is, a parallel circuit including the transmission antenna 12 and the variable capacitor described above). And a variable capacitor (not shown) connected in series. In addition, the first matching unit 13 changes the capacitance of each of the variable capacitors described above to change the signal generation unit 11 (specifically, the output impedance of the signal generation unit 11 viewed from the first matching unit 13 side). The transmitting antenna 12 (specifically, the input impedance of the transmitting antenna 12 viewed from the first matching unit 13 side) is matched.

  As shown in FIGS. 2 and 4, the shield member 14 is disposed on the back side of the transmission antenna 12 in a state where the transmission antenna 12 is viewed from the reception antenna side. The shield member 14 includes a flat base portion 14a formed in a size including the transmitting antenna 12 in a front view, and an edge portion (outer edge portion) of the base portion 14a as shown in FIGS. And a side wall 14b erected at the same height toward the transmitting antenna 12 over the entire edge (in this example, a side wall 14b). Thereby, the shield member 14 is formed in the box shape by which the opposing surface with the transmission antenna 12 was opened as a whole. The shield member 14 is formed using a material such as aluminum, for example.

  Further, as shown in FIGS. 2 and 3, one or a plurality of support legs 15 (four in this example) are erected on the surface (inner surface) of the base portion 14a of the shield member 14, and each tip portion is provided. A transmission antenna 12 is attached to the. Further, as shown in FIG. 3, each support leg 15 is defined such that its height H1 is slightly higher than the height H2 of the side wall 14 b of the shield member 14. Therefore, the transmitting antenna 12 does not enter the space A (the inner space of the shield member 14) A formed by the base portion 14a and the side wall 14b (that is, the entire transmitting antenna 12 is outside the box-shaped shield member 14). Located) and in close proximity to the shield member 14.

  As shown in FIG. 1, the power receiving device 3 includes a receiving antenna 21, a second matching unit 22, a rectifying unit 23, and an electromagnetic shield member 24. As an example, the receiving antenna 21 is formed in the same planar coil shape as the transmitting antenna 12 (planar coil shape formed by winding the electric wire 21 a a plurality of times), and has the same inductance as the transmitting antenna 12. The receiving antenna 21 is not limited to this example, and may be configured with a shape different from that of the transmitting antenna 12 or a different inductance. The reception antenna 21 is electromagnetically coupled to the transmission antenna 12 of the power transmission device 2 (that is, resonates via an electromagnetic field generated by the transmission antenna 12), and generates an induced voltage V1 between both ends thereof.

  The second matching unit 22 is disposed between the receiving antenna 21 and the rectifying unit 23 (specifically, interposed in a transmission path connecting the receiving antenna 21 and the rectifying unit 23), and is a transmitting antenna. 12, the impedance (output impedance) of the receiving antenna 21 that changes according to the distance between the rectifying unit 12 and the impedance on the rectifying unit 23 side are matched (the receiving antenna 21 and the rectifying unit 23 are shifted to a matching state). For example, the second matching unit 22 includes a variable capacitor (not shown) connected in parallel to the reception antenna 21 and a series circuit with respect to the reception antenna 21 (that is, a parallel circuit including the reception antenna 21 and the above-described variable capacitor). And a variable capacitor (not shown) connected in series) and configured in the same circuit as the first matching unit 13. In addition, the second matching unit 22 changes the electrostatic capacitance of each of the variable capacitors described above, so that the receiving antenna 21 (specifically, the output impedance of the receiving antenna 21 viewed from the rectifying unit 23 side) and the rectifying unit 23 ( Specifically, the input impedance of the rectifying unit 23 viewed from the receiving antenna 21 side is matched.

  The rectifying unit 23 inputs the induced voltage V1 generated in the receiving antenna 21 via the second matching unit 22, and supplies a voltage (DC voltage in this example) to the battery 4 as a load based on the induced voltage V1. Generate Vo. Specifically, the rectifying unit 23 includes, as an example, a rectifying circuit formed of a diode and a smoothing circuit, and rectifies and smoothes the induced voltage (AC voltage) V1 output from the second matching unit 22. The voltage Vo is generated and the generated voltage Vo is output to the battery 4.

  As shown in FIGS. 2 and 4, the electromagnetic shield member 24 (hereinafter also referred to as “shield member 24”) is disposed on the back side of the reception antenna 21 in a state where the reception antenna 21 is viewed from the front side from the transmission antenna 12 side. Has been. The shield member 24 includes a flat base portion 24a formed in a size including the receiving antenna 21 in a front view, and an edge portion (outer edge portion) of the base portion 24a as shown in FIGS. And a side wall 24b erected at the same height toward the receiving antenna 21 over the entire edge (in this example, a side wall 24b). Thereby, the shield member 24 is formed in a box shape having an opening surface facing the receiving antenna 21 as a whole.

  As shown in FIGS. 2 and 3, one or a plurality of support legs 25 (four in this example) are erected on the surface (inner surface) of the base portion 24a of the shield member 24, and each tip portion is provided. A receiving antenna 21 is attached to the antenna. Similarly to the support leg 15, each support leg 25 is defined such that its height H 1 is slightly higher than the height H 2 of the side wall 24 b of the shield member 24, as shown in FIG. Therefore, the receiving antenna 21 does not enter the space B (inner space of the shield member 24) B formed by the base portion 24a and the side wall 24b (that is, the entire receiving antenna 21 is outside the box-shaped shield member 24). Positioned) and close to the shield member 24.

  The shield member 24 has the same electromagnetic shielding effect as the shield member 14 and is made of a metal material such as aluminum having high thermal conductivity. As shown in FIGS. The unit 22 and the rectifying unit 23 including the diode that generates heat (specifically, the electronic components constituting the rectifying unit 23) are attached to the base unit 24a, thereby functioning also as a radiator for the rectifying unit 23. When the entire shield member 24 is configured using a material having high thermal conductivity, the rectifying unit 23 is limited to a configuration arranged on the inner surface of the base unit 24a as shown in FIGS. Alternatively, it can be arranged on the outer surface. Further, when the rectifying unit 23 is disposed on the inner surface of the shield member 24 (the inner surface of the base portion 24a), the central portion of the receiving antenna 21 (the opening surface of the receiving antenna 21) that has little influence on the electromagnetic field formed by the receiving antenna 21. (On the lower side (base part 24a side)) or closer to the side wall 24b of the shield member 24.

  Next, the operation of the non-contact power transmission device 1 will be described. In addition, the adjustment with respect to the 1st matching part 13 and the 2nd matching part 22 is performed previously, the signal generation part 11 and the transmission antenna 12 are in a matching state, and the receiving antenna 21 and the rectification part 23 are in a matching state And Further, as shown in FIG. 4, the transmission antenna 12 on the power transmission device 2 side and the reception antenna 21 on the power reception device 3 side have the shield members 14 and 24 located close to each other on the back side, and the shield members 14, It is assumed that they are arranged in a state where they do not enter the spaces A and B, respectively, and are arranged so as to face each other.

  In the power transmission device 2, the signal generation unit 11 outputs the AC signal S <b> 1 to the transmission antenna 12 via the first matching unit 13. As a result, in the power receiving device 3, an induced voltage V <b> 1 is generated in the receiving antenna 21 that is electromagnetically coupled to the transmitting antenna 12, and the rectifying unit 23 rectifies the induced voltage V <b> 1 output via the second matching unit 22. A voltage Vo is generated. As a result, the voltage Vo is supplied to the battery 4 and the battery 4 is charged.

  As described above, in the power transmission device 2 of the non-contact power transmission device 1, the transmission antenna 12 is wide enough to include the entire transmission antenna 12 when viewed from the front, and the box-shaped shield member 14 is located on the back side. And in the state of being close to the shield member 14. Therefore, according to the non-contact power transmission device 1, even if the transmission antenna 12 is not stored in the shield member 14, a leakage electromagnetic field generated around the transmission antenna 12 (particularly, the transmission antenna 12). The leakage electromagnetic field in the back direction and the side direction) can be effectively shielded by the base portion 14a and the side wall 14b of the shield member 14. Further, according to the power transmission device 2 of the non-contact power transmission device 1, the transmission antenna 12 does not enter the space A of the shield member 14, that is, the entire transmission antenna 12 is positioned outside the shield member 14. Compared with the configuration stored in the space A of the shield member 14, it is possible to reliably avoid the power transmission from the transmission antenna 12 to the reception antenna 21 from being affected by the shield member 14. Efficient power transmission can be performed to the power receiving device 3.

  Further, in the power receiving device 3 of the non-contact power transmission device 1, the receiving antenna 21 is wide enough to include the entire receiving antenna 21 when viewed from the front, and the box-shaped shield member 24 is located on the back side, and The shield member 24 is disposed in the vicinity. Therefore, according to the non-contact power transmission device 1, even if the reception antenna 21 is not stored in the space B of the shield member 24, a leakage electromagnetic field generated around the reception antenna 21 (particularly, reception The leakage electromagnetic field in the rear direction and the side direction of the antenna 21 can be effectively shielded by the base portion 24a and the side wall 24b of the shield member 24. Further, according to the power receiving device 3 of the non-contact power transmission device 1, the receiving antenna 21 does not enter the space B of the shield member 24, that is, the entire receiving antenna 21 is positioned outside the shield member 24. Compared with the configuration stored in the shield member 24, it is possible to reliably avoid a decrease in power reception at the receiving antenna 21 due to the influence of the shield member 24. As a result, the power from the power transmission device 2 can be reduced. Power can be received efficiently.

  Furthermore, the power receiving device 3 of the non-contact power transmission device 1 has a high thermal conductivity by being configured using a metal material, and has a large area (that is, a large area) including the entire receiving antenna 21. A rectifying unit 23 that generates heat is attached to the shield member 24. Therefore, according to the power receiving device 3 of the non-contact power transmission device 1, since the shield member 24 functions as a good radiator for the rectification unit 23, the rectification unit 23 can be efficiently cooled. As a result, the non-contact power transmission device 1 Can improve the reliability.

  Note that the present invention is not limited to the configuration shown in the above embodiment. For example, in the non-contact power transmission device 1 described above, since the power receiving device 3 includes the rectifying unit 23 that generates heat, a configuration in which the shield member 24 is used as a radiator only in the power receiving device 3 is employed. Also in the power transmission device 2, for example, when a configuration in which an amplifier or the like with heat generation is disposed between the signal generation unit 11 and the first matching unit 13, the shield member 14 and the shield member 24 have the same heat conduction. It is also possible to make the shield member 14 function as a radiator for the amplifier by constituting the material with a good property (metal material) and attaching the amplifier to the shield member 14.

  In the non-contact power transmission device 1 described above, the shield members 14, 24 that are formed in a box shape with side walls 14 b, 24 b are provided to the antennas 12, 21 of both the power transmission device 2 and the power reception device 3. In the case where either one of the power transmission device 2 and the power reception device 3 is less affected by the leakage electromagnetic field, the base without the side wall 14b (or the side wall 24b) is used in this one device. A flat shield member composed only of the portion 14a (or the base portion 24a) can also be disposed.

  In the non-contact power transmission device 1 described above, the transmitting antenna 12 and the receiving antenna 21 are formed in a planar coil shape having a square shape when viewed from the front. However, the shape is not limited to this shape. Also, it can be formed in a planar coil shape of various shapes such as a circular shape in front view and an elliptical shape in front view.

  Further, the planar shape of each of the base portions 14a and 24b of the shield member 14 and the shield member 24 is formed in a square shape in front view in accordance with the shapes of the transmission antenna 12 and the reception antenna 21 formed in a planar coil shape in a square shape in front view. However, it is also possible to define the front view shape according to the front view shape of the corresponding antenna. In addition, various shapes such as a planar shape different from the planar shape of the corresponding antenna can be adopted as long as the shape includes the corresponding antenna when viewed from the front. In addition, the shield member 14 and the shield member 24 are entirely formed of a material having a function of shielding electromagnetism, but is not limited to this configuration. For example, a material having no function of shielding electromagnetism (for example, a synthetic material) It is also possible to adopt a configuration in which the base portions 14a and 24a and the side walls 14b and 24b are formed of a resin material, and a shielding film having a shielding function against electromagnetics is formed on these surfaces.

  In the above power transmission device 2, as shown in FIG. 1, the shield member 14 is disposed on the back side of the transmission antenna 12 and on the front side of the first matching unit 13 (the transmission antenna 12 and the first However, the present invention is not limited to this configuration. For example, when the transmission antenna 12 and the first matching unit 13 are integrated, the transmission antenna is used. 12 and the structure which arrange | positions the shield member 14 to the back side of the 1st matching part 13 is employable. That is, as long as the shield member 14 is disposed on the back side of the transmission antenna 12, the first matching portion 13 can be disposed at any position on the front side and the back side of the shield member 14. is there.

  Also, in FIG. 1, in the power receiving device 3, in order to clearly show the configuration in which the shield member 24 is disposed on the back side of the receiving antenna 21, the shield member 24 is on the back side of the receiving antenna 21 and the second matching is performed. Although the structure (structure arrange | positioned between the receiving antenna 21 and the 2nd matching part 22) arrange | positioned in the front side of the part 22 is shown, said shield member 24 is functioned as a heat radiator of the rectifier part 23. As in the configuration (the configuration in which the second matching portion 22 and the rectifying portion 23 are arranged on the inner surface of the base portion 24a of the shield member 24), the receiving antenna 21, the second matching portion 22 and the rectifying portion 23 are shielded on the back side. A configuration in which the member 24 is disposed may be employed. Even if the shield member 24 does not function as a radiator of the rectifying unit 23, when the receiving antenna 21 and the second matching unit 22 are integrated, the back side of the receiving antenna 21 and the second matching unit 22 is used. And the structure which arrange | positions the shield member 24 in the front side of the rectification | straightening part 23 is employable. Further, when the shield member 24 does not function as a radiator of the rectifying unit 23 and the receiving antenna 21 and the second matching unit 22 are not integrated, as shown in FIG. And the structure which arrange | positions the shield member 24 in the front side of the 2nd matching part 22 and the rectification | straightening part 23 is also employable. That is, in the power receiving device 3, as long as the shield member 24 is arranged on the back side of the receiving antenna 21, the second matching unit 22 and the rectifying unit 23 are on the front side and the back side of the shield member 24. Arrangement at any position is possible.

DESCRIPTION OF SYMBOLS 1 Contactless power transmission apparatus 2 Power transmission apparatus 3 Power receiving apparatus 12 Transmitting antenna 14 Shielding member 14a Base part 14b Side wall 21 Reception antenna 24 Shielding member 24a Base part 24b Side wall

Claims (4)

One antenna that performs non-contact transmission and reception of electric power with another antenna disposed on the front side, and an electromagnetic shielding member, and the one antenna includes the electromagnetic on the back side A non-contact power transmission device arranged so that a shield member is located,
The electromagnetic shielding member includes a plate-like base portion having a width including the whole of the one antenna in a front view when the one antenna is viewed from the front side, and the entire edge portion from the edge portion of the base portion. And a side wall erected toward the one antenna side, and is formed in a box shape in which a surface facing the one antenna is opened,
The non-contact power transmission device, wherein the one antenna does not enter a space formed by the base portion and the side wall of the electromagnetic shield member, and is disposed in a state close to the electromagnetic shield member.   The non-contact power transmission device according to claim 1, wherein the electromagnetic shield member is configured using a metal material, and an electronic component connected to the one antenna is attached to function as a radiator of the electronic component. . Including the other antenna disposed so that another electromagnetic shield member is located on the back side;
The other electromagnetic shield member includes a plate-like base portion having a width including the entire other antenna in a front view when the other antenna is viewed from the front side, and an edge from the edge of the base portion. It is formed in a box shape having a side wall erected toward the other antenna side over the entire area and having an opening surface facing the other antenna,
The other antenna does not enter a space formed by the base portion and the side wall of the other electromagnetic shield member, and is disposed in a state close to the other electromagnetic shield member. The non-contact power transmission device according to 1 or 2.   The non-contact power according to claim 3, wherein the other electromagnetic shield member is configured using a metal material, and an electronic component connected to the other antenna is attached to function as a radiator of the electronic component. Electric transmission device.

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