Charging stand

Abstract

To increase received power.SOLUTION: A charging stand includes a support portion 10 and a power receiving unit. The support portion 10 supports an electronic device. The power receiving unit receives a power transmission signal sent from a power sending unit and charges a battery included in the electronic device. The power receiving unit includes a power receiving antenna 83 and a parasitic element 100. The power receiving antenna 83 receives a power transmission signal. The parasitic element 100 improves gain characteristics of the power receiving antenna 83. The power receiving antenna 83 and the parasitic element 100 are arranged so as to lie opposite each other.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present disclosure relates to a charging station. [Background technology]

[0002] The electronic device includes a battery. The electronic device is operated by power from the battery. Patent Document 1 discloses a support apparatus for supporting an electronic device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-39768 A Summary of the Invention [Problem to be solved by the invention]

[0004] There are cases where it is desired to charge the battery of an electronic device using a power transmission signal transmitted from a power transmitting device while the electronic device is supported by a support device. In this case, it is conceivable to provide a power receiving device on the support device and have the power receiving device receive the power transmission signal. The power receiving device charges the battery with the received power obtained by receiving the power transmission signal. For this reason, it is required to increase the received power. [Means for solving the problem]

[0005] A charging stand that solves the above problem comprises a support part that supports an electronic device, and a power receiving device that receives a power transmission signal transmitted from a power transmitting device and charges a battery provided in the electronic device, the power receiving device comprising a power receiving antenna that receives the power transmission signal, and a parasitic element for improving the gain characteristics of the power receiving antenna, and is configured so that the power receiving antenna and the parasitic element are directly opposite each other.

[0006] By configuring the power receiving antenna and the parasitic element to face each other directly, the gain characteristics of the power receiving antenna are improved, and the received power is greater than in a case where the charging stand does not include a parasitic element.

[0007] It is preferable that the charging stand is provided with legs that are rotatably arranged relative to the support part, the legs are rotatable between a folded position and an unfolded position, and the charging stand is configured such that the receiving antenna and the parasitic element face each other directly when the legs are in the unfolded position.

[0008] When the charging stand is used, the legs are deployed. With the legs in the deployed position, the power receiving antenna and the parasitic element face each other directly, improving the gain characteristics of the power receiving antenna when the charging stand is used.

[0009] The charging stand preferably further comprises an interlocking portion that is interlocked with the rotation of the leg portion, and the parasitic element is preferably provided on the interlocking portion. It is preferable that the charging stand further comprises a reflector that reflects the power transmission signal, and that the reflector is configured so that its position relative to the power receiving antenna can be changed.

[0010] By adjusting the relative positions of the reflector and the receiving antenna, the received power can be increased. The charging stand preferably includes an indicator that displays the magnitude of received power obtained by receiving the power transmission signal.

[0011] A user of the charging station can check the magnitude of the received power by visually checking the indicator. Effect of the Invention

[0012] According to the present invention, it is possible to increase the received power. [Brief description of the drawings]

[0013] [Figure 1]FIG. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. 2 is a side view of the charging stand with the legs in the deployed position. [Figure 6] 4 is a cross-sectional view showing a mounting manner of the movable member, the support portion, and the interlocking portion. FIG. [Figure 7] FIG. 2 is a schematic diagram of a charging device. [Figure 8] 11 is a perspective view showing the relative positions of the power receiving antenna and the parasitic element when the legs are in the deployed position. FIG. [Figure 9] FIG. 11 is a side view showing a modified example of the charging stand. [Figure 10] FIG. 11 is a schematic diagram showing a modified example of the charging stand. [Figure 11] FIG. 13 is a schematic diagram of an extension mechanism for adjusting the position of a reflector. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] An embodiment of a charging station will now be described. As shown in FIGS. 1 and 2, the charging stand C1 includes a support portion 10, a leg portion 30, an interlocking portion 40, a first rotating shaft 61, and a second rotating shaft 62.

[0015] The support portion 10 includes a rear support portion 11 and a lower end support portion 29. The rear support portion 11 includes a first support portion 12 and a second support portion 18. The support portion 10 is made of, for example, resin.

[0016] The first support portion 12 is rectangular when viewed from the front. The first support portion 12 has a first end portion 13, a second end portion 14, a third end portion 15, and a fourth end portion 16. The first end portion 13 and the second end portion 14 are ends that are opposite to each other in a first direction. In this embodiment, the first direction is the long side direction of the first support portion 12. The third end portion 15 and the fourth end portion 16 are ends that are opposite to each other in a second direction. In this embodiment, the second direction is the short side direction of the first support portion 12. A direction perpendicular to the first direction and the second direction is defined as a third direction.

[0017] 3, the second support portion 18 is provided so as to protrude in the third direction from the first support portion 12. The second support portion 18 includes a first portion 21 and a second portion 22. The first portion 21 is provided along the fourth end portion 16. The dimension of the first portion 21 in the first direction is shorter than the dimension of the first support portion 12 in the first direction. The second portion 22 is integral with the first portion 21. The dimension of the second portion 22 in the third direction is shorter than the dimension of the first portion 21 in the third direction. It can be said that the amount by which the second portion 22 protrudes from the first support portion 12 is smaller than the amount by which the first portion 21 protrudes from the first support portion 12.

[0018] The second portion 22 includes a first end 23, a second end 24, and a third end 25. The first end 23 and the second end 24 are ends opposite to each other in the first direction. The first end 23 of the second support portion 18 is separated from the first end 13 of the first support portion 12 in a direction from the first end 13 to the second end 14 of the first support portion 12. As a result, a first region A1 is provided along the first end 23 of the second support portion 18 so as to be recessed toward the first support portion 12. The second end 24 of the second support portion 18 is separated from the second end 14 of the first support portion 12 in a direction from the second end 14 to the first end 13 of the first support portion 12. As a result, a second region A2 is provided along the second end 24 of the second support portion 18 so as to be recessed toward the first support portion 12. The third end 25 of the second support portion 18 is an end in the second direction and is provided on the opposite side to the first portion 21. The third end 25 of the second support portion 18 is spaced apart from the third end 15 of the first support portion 12 in a direction from the third end 15 to the fourth end 16 of the first support portion 12. This provides a third region A3 that is recessed toward the first support portion 12 along the third end 25 of the second support portion 18.

[0019] The support portion 10 includes a first protruding portion 27 and a second protruding portion 28. Each of the protruding portions 27, 28 protrudes from the first support portion 12 in the same direction as the second support portion 18. Each of the protruding portions 27, 28 is provided so as to sandwich the second region 22 from the first direction.

[0020] 1, the lower end support portion 29 protrudes from the first support portion 12 in the third direction, which is opposite to the direction in which the second support portion 18 protrudes. The lower end support portion 29 is provided so as to extend in the first direction along the third end portion 15.

[0021] 2, the leg portion 30 includes a first support pillar 31, a second support pillar 34, a first beam portion 37, and a second beam portion 38. The leg portion 30 is made of, for example, resin. The first support pillar 31 and the second support pillar 34 are provided apart from each other. The first support pillar 31 and the second support pillar 34 are provided parallel to each other. The first support pillar 31 has a first end 32 and a second end 33. The first end 32 and the second end 33 are ends of the first support pillar 31 that are opposite to each other in the axial direction. The second support pillar 34 has a first end 35 and a second end 36. The first end 35 and the second end 36 are ends of the second support pillar 34 that are opposite to each other in the axial direction.

[0022] Each beam portion 37, 38 is bridged between the first support 31 and the second support 34. The first beam portion 37 and the second beam portion 38 are provided apart from each other in the axial direction of each support 31, 34. The first beam portion 37 and the second beam portion 38 are provided parallel to each other. The first beam portion 37 is provided apart from the first end portion 32, 35 of each support 31, 34. The dimension from the first end portion 32, 35 of each support 31, 34 to the first beam portion 37 is longer than the dimension of the first portion 21 in the second direction. The second beam portion 38 is provided between the second end portions 33, 36 of each support 31, 34.

[0023] The leg 30 is provided in a state in which it can rotate with respect to the support 10. The first support 31 and the second support 34 are provided so as to sandwich the second support 18 from a first direction. The first end 32 of the first support 31 and the first end 35 of the second support 34 are each attached to the first part 21 by a first rotating shaft 61. The two first rotating shafts 61 are positioned on the same axis. This allows the leg 30 to rotate with respect to the support 10 around the first rotating shaft 61 as the center of rotation.

[0024] As shown in Figures 4 and 5, the leg 30 can rotate between a folded position and an unfolded position. As shown in Figure 4, the folded position is a state in which the angle between the support 10 and the pillars 31, 34 is the smallest. As shown in Figure 5, the unfolded position is a state in which the angle between the support 10 and the pillars 31, 34 is the largest within the range in which the leg 30 can rotate.

[0025] When the leg 30 is in the folded position, the first support 31 is provided along the first end 23 of the second portion 22. The first support 31 is stored in the first region A1. When the leg 30 is in the folded position, the second support 34 is provided along the second end 24 of the second portion 22. The second support 34 is stored in the second region A2. When the leg 30 is in the folded position, the second beam 38 is provided along the third end 25 of the second portion 22. The second beam 38 is stored in the third region A3. The dimension from the first end 32, 35 of each support 31, 34 to the first beam 37 is longer than the dimension of the first portion 21 in the second direction, so that the first beam 37 faces the second portion 22. That is, the first beam 37 is less likely to interfere with the first portion 21 when the leg 30 is folded.

[0026] As shown in FIG. 1, when the charging stand C1 is placed with the legs 30 in the deployed position and the third end 15 of the first support part 12 and the second ends 33, 36 of the pillars 31, 34 facing downward, the charging stand C1 becomes self-supporting. When the electronic device 200 is placed on the support part 10 in this state, the support part 10 supports the electronic device 200. The rear support part 11 supports the rear side of the electronic device 200. The lower end support part 29 supports the lower end of the electronic device 200. The electronic device 200 includes a battery 201. The electronic device 200 operates using power from the battery 201. An example of the electronic device 200 is a mobile terminal. An example of the mobile terminal is a smartphone or a tablet terminal.

[0027] As shown in Fig. 2, the interlocking part 40 includes an interlocking part main body 41, a first attachment part 42, and a second attachment part 43. The interlocking part main body 41 is rectangular and plate-like. Each attachment part 42, 43 protrudes from the interlocking part main body 41 in the thickness direction of the interlocking part main body 41. Each attachment part 42, 43 is provided apart from each other in the long side direction of the interlocking part main body 41. The interlocking part 40 is made of, for example, resin.

[0028] The interlocking part 40 is provided so that the long side direction of the interlocking part main body 41 coincides with the first direction. Each mounting part 42, 43 is attached to the leg part 30 by a second rotating shaft 62. The first mounting part 42 is attached to the first support 31 by the second rotating shaft 62. The second mounting part 43 is attached to the second support 34 by the second rotating shaft 62. The two second rotating shafts 62 are located on the same axis. The interlocking part 40 is rotatable relative to the leg part 30 with the second rotating shaft 62 as the rotation center.

[0029] As shown in FIGS. 5 and 6, the charging stand C1 includes a first movable member 51, a second movable member 52, a third rotating shaft 63, a fourth rotating shaft 64, a fifth rotating shaft 65, and a reflector 70.

[0030] Each of the movable members 51, 52 is attached to the support portion 10 and the interlocking portion 40. Each of the movable members 51, 52 is attached to the support portion 10 by a third rotating shaft 63. The first movable member 51 is attached by the third rotating shaft 63 in a state where it is inserted between the first protruding portion 27 and the second portion 22. The second movable member 52 is attached by the third rotating shaft 63 in a state where it is inserted between the second protruding portion 28 and the second portion 22. The two third rotating shafts 63 are located on the same axis. Each of the movable members 51, 52 is attached to the interlocking portion 40 by a fourth rotating shaft 64. The first movable member 51 is attached to the first mounting portion 42 by the fourth rotating shaft 64. The second movable member 52 is attached to the second mounting portion 43 by the fourth rotating shaft 64. The two fourth rotating shafts 64 are located on the same axis.

[0031] The interlocking part 40 interlocks with the leg part 30 via the rotation shafts 61-64. When the leg part 30 is in the folded position, the interlocking part 40 overlaps with the second part 22. In this state, the interlocking part 40 is stored in an area surrounded by the pillars 31, 34 and the beams 37, 38. When the leg part 30 is in the unfolded position, the interlocking part 40 is separated from the second part 22.

[0032] The distance between the first rotating shaft 61 and the second rotating shaft 62 is the same as the distance between the third rotating shaft 63 and the fourth rotating shaft 64. The distance between the first rotating shaft 61 and the third rotating shaft 63 is the same as the distance between the second rotating shaft 62 and the fourth rotating shaft 64. As a result, the rectangle formed by connecting the first rotating shaft 61, the second rotating shaft 62, the third rotating shaft 63, and the fourth rotating shaft 64 with imaginary lines is maintained as a parallelogram. The interlocking portion 40 and the support portion 10 are maintained in a parallel state regardless of the position of the interlocking portion 40. In detail, the interlocking portion main body 41 and the second portion 22 are maintained in a parallel state.

[0033] As shown in FIG. 2, the reflector 70 includes a reflector body 71, a first reflector attachment portion 72, and a second reflector attachment portion 73. The reflector body 70 is made of metal. For example, the reflector body 70 is made of aluminum or copper. The reflector body 70 may be a member whose surface is covered with metal by plating. The reflector body 71 is rectangular and plate-like. Each of the reflector attachment portions 72, 73 protrudes from the interlocking body 41 in the thickness direction of the interlocking body 41. Each of the reflector attachment portions 72, 73 is provided at two corners spaced apart from each other in the long side direction. The two corners are corners provided at both ends of one of the four sides of the reflector body 71.

[0034] The reflector 70 is attached so that the long side direction of the reflector body 71 coincides with the first direction. The reflector attachment parts 72, 73 are provided so as to sandwich the first support 31 and the second support 34. The reflector attachment parts 72, 73 are attached to the leg 30 by the fifth rotation shaft 65. The first reflector attachment part 72 is attached to the second end 33 of the first support 31 by the fifth rotation shaft 65. The second reflector attachment part 73 is attached to the second end 36 of the second support 34 by the fifth rotation shaft 65. The two fifth rotation shafts 65 are located on the same axis. The reflector 70 is rotatable around the fifth rotation shaft 65 as the rotation center. The reflector 70 is provided rotatably with respect to the leg 30. The reflector 70 can be rotated until the reflector body 71 and the leg 30 come into contact with each other. The reflector 70 can be rotated until the reflector body 71 comes into contact with the installation surface. The installation surface is the surface on which the charging stand C1 is placed.

[0035] 5, the power receiving device 80 includes a charging device 81 and a parasitic element 100. The charging device 81 is built into the support section 10. It can be said that the support section 10 also functions as a housing for accommodating the charging device 81.

[0036] As shown in FIG. 7, the charging device 81 includes an internal battery 82, a power receiving antenna 83, a rectifier circuit 84, a charging circuit 85, a device charging circuit 86, a connection unit 87, a switching circuit 88, an indicator 89, and an LED display circuit 92.

[0037] Built-in battery 82 is a power storage device that can be discharged and charged. A secondary battery or a capacitor may be used as built-in battery 82. Built-in battery 82 serves as a power source for devices required to operate charging device 81, such as LED display circuit 92.

[0038] The power receiving antenna 83 receives a power transmission signal. The power transmission signal is transmitted from the power transmitting device 300. The power transmitting device 300 is installed, for example, in a home, a vehicle, a public facility, or a commercial facility. The frequency band of the power transmission signal is a microwave band. The microwave band is a frequency band from 300 MHz to 300 GHz. In this embodiment, power is fed from the power transmitting device 300 to the power receiving device 80 by microwave feeding.

[0039] 8, the power receiving antenna 83 is a patch antenna. The power receiving antenna 83 is a planar antenna. The power receiving antenna 83 has a flat, rectangular shape. The power receiving antenna 83 is provided such that the thickness direction coincides with the third direction.

[0040] 7, the power receiving antenna 83 is connected to a rectifier circuit 84. The rectifier circuit 84 converts the power transmission signal received by the power receiving antenna 83 into direct current and outputs it to a charging circuit 85. The power receiving antenna 83 and the rectifier circuit 84 form a rectenna circuit.

[0041] Rectifier circuit 84 is connected to charging circuit 85. Charging circuit 85 converts the DC power input from rectifier circuit 84. Charging circuit 85 transforms the DC power input from rectifier circuit 84 and outputs it to built-in battery 82. Built-in battery 82 is charged by the power output from charging circuit 85.

[0042] The device charging circuit 86 is connected to the built-in battery 82. The device charging circuit 86 performs power conversion of the DC power input from the built-in battery 82. The device charging circuit 86 transforms the DC power input from the built-in battery 82 and outputs it to the battery 201. The battery 201 is charged by the power output from the device charging circuit 86. The built-in battery 82 is charged by the received power obtained by receiving a power transmission signal transmitted from the power transmitting device 300. Therefore, it can be said that the battery 201 is charged by the received power.

[0043] The connection unit 87 electrically connects the device charging circuit 86 and the battery 201. A cable that electrically connects the device charging circuit 86 and the battery 201 is used as the connection unit 87. The connection unit 87 extends from the fourth end 16 of the first support unit 12 to the outside of the support unit 10. When the connection unit 87 is connected to a port of the electronic device 200, power output from the device charging circuit 86 is supplied to the battery 201.

[0044] The switching circuit 88 is connected to the LED display circuit 92. The switching circuit 88 selectively switches the connection destination of the LED display circuit 92 to the rectifier circuit 84 or the built-in battery 82. The switching circuit 88 may be switched by an operation by a user of the charging stand C1. The switching circuit 88 may be switched so as to connect the rectifier circuit 84 and the LED display circuit 92 when the power receiving antenna 83 is receiving a power transmission signal, and to connect the built-in battery 82 and the LED display circuit 92 when the power receiving antenna 83 is not receiving a power transmission signal. The switching circuit 88 may be switched at predetermined time intervals.

[0045] The indicator 89 is connected to an LED display circuit 92. The indicator 89 indicates the magnitude of the received power. The indicator 89 includes a plurality of display areas 90 and a light-emitting diode 91. The display areas 90 are provided at intervals from each other. The indicator 89 can switch between lighting and extinguishing each of the display areas 90 by the light-emitting diode 91.

[0046] 2, the indicator 89 is provided on the first portion 21. The indicator 89 is provided at a position visible to a user of the charging stand C1 when the leg portion 30 is in the unfolded position.

[0047] 7, the LED display circuit 92 includes an LED driver 93 that controls the light emitting diode 91, and a voltage detection unit 94 that detects a voltage input to the LED display circuit 92. When the rectifier circuit 84 and the LED display circuit 92 are connected by the switching circuit 88, a DC voltage is input to the LED display circuit 92 from the rectifier circuit 84. When the built-in battery 82 and the LED display circuit 92 are connected by the switching circuit 88, a DC voltage is input to the LED display circuit 92 from the built-in battery 82.

[0048] The LED display circuit 92 controls the light emitting diodes 91. When the rectifier circuit 84 is connected to the LED display circuit 92 by the switching circuit 88, the LED display circuit 92 performs control so that the number of lighted display areas 90 increases as the received power increases. The correspondence between the magnitude of the received power and the number of lighted display areas 90 is determined in advance by a threshold value or the like, and the LED display circuit 92 controls the light emitting diodes 91 in accordance with the correspondence. The received power can be detected by a voltage detection unit 94.

[0049] When the built-in battery 82 is connected to the LED display circuit 92, the LED display circuit 92 controls the number of lighted display areas 90 to increase as the voltage of the built-in battery 82 increases. The correspondence between the voltage of the built-in battery 82 and the number of lighted display areas 90 is determined in advance by a threshold value or the like, and the LED display circuit 92 controls the light-emitting diodes 91 according to the correspondence. The voltage of the built-in battery 82 can be detected by the voltage detection unit 94. Thus, in this embodiment, the indicator 89 is controlled according to the voltage of the built-in battery 82. The voltage of the built-in battery 82 increases as the charging rate of the built-in battery 82 increases. It can be said that the indicator 89 represents the charging rate of the built-in battery 82. The LED display circuit 92 may change the light color of the light-emitting diodes 91 between when the rectifier circuit 84 is connected to the LED display circuit 92 and when the built-in battery 82 is connected to the LED display circuit 92.

[0050] As shown in FIG. 5, the parasitic element 100 is provided in the interlocking part 40. More specifically, the parasitic element 100 is provided on one of the thickness-wise surfaces of the interlocking part main body 41 facing the support part 10. The parasitic element 100 is intended to improve the gain characteristics of the receiving antenna 83. The parasitic element 100 is flat and rectangular. The parasitic element 100 is provided so that the thickness direction of the parasitic element 100 coincides with the thickness direction of the interlocking part main body 41. The parasitic element 100 is made of metal. For example, the parasitic element 100 is made of aluminum or copper.

[0051] The positional relationship between the power receiving antenna 83 and the parasitic element 100 will be described. 8, the power receiving antenna 83 and the parasitic element 100 face each other. In detail, the power receiving antenna 83 and the parasitic element 100 face each other with the support part 10 interposed therebetween.

[0052] The relative position between the receiving antenna 83 and the parasitic element 100 is a predetermined fixed position. In detail, when the leg 30 is in the deployed posture, the relative position between the receiving antenna 83 and the parasitic element 100 is a predetermined fixed position. The relative position includes a relative angle and a relative distance.

[0053] The receiving antenna 83 and the parasitic element 100 are parallel regardless of the posture of the leg 30. When the leg 30 is changed from the folded posture to the unfolded posture, the receiving antenna 83 and the parasitic element 100 move away from each other while maintaining their parallelism. The relative angle between the receiving antenna 83 and the parasitic element 100 can be said to be constant. When the leg 30 is in the unfolded posture, the central axis of the receiving antenna 83 and the central axis of the parasitic element 100 are positioned on the same axis line. When the leg 30 is in the unfolded posture, the receiving antenna 83 and the parasitic element 100 are directly opposite each other.

[0054] When the leg 30 is changed from the folded position to the unfolded position, the relative distance between the power receiving antenna 83 and the parasitic element 100 increases. The parasitic element 100 is provided to improve the gain characteristics of the power receiving antenna 83. More specifically, the parasitic element 100 is provided to improve the gain characteristics of the power receiving antenna 83 with respect to the elevation angle. The gain characteristics of the power receiving antenna 83 vary depending on the relative distance between the power receiving antenna 83 and the parasitic element 100. When the relative distance between the power receiving antenna 83 and the parasitic element 100 is increased from 0, the gain of the power receiving antenna 83 increases. When the relative distance between the power receiving antenna 83 and the parasitic element 100 reaches a predetermined value, the gain of the power receiving antenna 83 decreases. That is, the gain of the power receiving antenna 83 reaches a peak when the relative distance between the power receiving antenna 83 and the parasitic element 100 reaches a predetermined value, and decreases as the relative distance moves away from the predetermined value. The predetermined value varies depending on various factors such as the size of the power receiving antenna 83, the material of the power receiving antenna 83, the size of the parasitic element 100, and the material of the parasitic element 100. The predetermined value may also vary depending on the elevation angle. For this reason, the relative distance may be determined depending on the elevation angle range in which the gain of the power receiving antenna 83 is to be improved and the predetermined value. For example, the thickness direction of the power receiving antenna 83 is set to an elevation angle of 0°. When the gain in a high elevation angle range of 60° to 90° is to be improved, the predetermined value in the high elevation angle range is obtained. The predetermined value can be obtained by an experiment or a simulation. Then, the positions of the interlocking part 40 and the parasitic element 100 are set so that the relative distance between the power receiving antenna 83 and the parasitic element 100 is the predetermined value or a value within an allowable range from the predetermined value. The relative distance between the power receiving antenna 83 and the parasitic element 100 may be changed depending on whether or not a dielectric is provided between the power receiving antenna 83 and the parasitic element 100. When the leg 30 is in the deployed position, the relative position between the power receiving antenna 83 and the parasitic element 100 is a predetermined fixed position. The predetermined fixed position is a position that is determined so that the gain characteristics of the power receiving antenna 83 are desired. The predetermined fixed position can be changed as appropriate depending on the gain characteristics required for the power receiving antenna 83. Note that the predetermined fixed position allows for errors caused by tolerances.As described above, the predetermined fixed position is a position where the receiving antenna 83 and the parasitic element 100 face each other directly and where the relative distance between the receiving antenna 83 and the parasitic element 100 is a predetermined distance.

[0055] The operation of this embodiment will be described. When the leg 30 is in the deployed position, the relative positions of the power receiving antenna 83 and the parasitic element 100 become a predetermined fixed position. As a result, the gain characteristics of the power receiving antenna 83 are improved by the parasitic element 100.

[0056] A user of the charging stand C1 can adjust the relative position between the reflector 70 and the power receiving antenna 83 by rotating the reflector 70. The reflector 70 reflects a power transmission signal. By adjusting the relative position between the reflector 70 and the power receiving antenna 83, the power transmission signal can be reflected toward the power receiving antenna 83 and the parasitic element 100. At this time, the user of the charging stand C1 rotates the reflector 70 while visually checking the indicator 89. The user of the charging stand C1 can stop the reflector 70 at a position where the received power is maximized according to the indicator 89.

[0057] The effects of this embodiment will be described. (1) The charging stand C1 includes a power receiving antenna 83 and a parasitic element 100. The parasitic element 100 improves the gain characteristics of the power receiving antenna 83. As a result, the received power is greater than when the charging stand C1 does not include the parasitic element 100. The effect of improving the gain characteristics of the power receiving antenna 83 varies depending on the relative positions of the power receiving antenna 83 and the parasitic element 100. By directly facing the power receiving antenna 83 and the parasitic element 100, the gain characteristics of the power receiving antenna 83 are improved when the charging stand C1 is used.

[0058] (2) The relative position between the power receiving antenna 83 and the parasitic element 100 is set to a predetermined fixed position. This allows the power receiving antenna 83 to obtain the desired gain characteristics. In other words, the improvement effect of the gain characteristics of the power receiving antenna 83 by the parasitic element 100 can be made to function as expected.

[0059] (3) The power receiving antenna 83 and the parasitic element 100 face each other when the legs 30 are in the unfolded position. When the charging stand C1 is in use, the legs 30 are in the unfolded position to allow the charging stand C1 to stand on its own. When the charging stand C1 is in use, the gain characteristics of the power receiving antenna 83 can be improved.

[0060] (4) The parasitic element 100 is provided on the interlocking portion 40. The interlocking portion 40 is interlocked with the leg portion 30. By placing the leg portion 30 in the deployed posture, the relative position between the power receiving antenna 83 and the parasitic element 100 becomes a predetermined fixed position. This makes it possible to easily keep the relative position between the power receiving antenna 83 and the parasitic element 100 at a predetermined fixed position.

[0061] (5) The charging stand C1 includes a reflector 70. The power transmission signal can be reflected by the reflector 70. The received power of the power receiving device 80 can be increased. (6) The charging stand C1 is equipped with an indicator 89. A user of the charging stand C1 can check the magnitude of the received power by visually checking the indicator 89. A user of the charging stand C1 can place the charging stand C1 in a position where the received power is large by adjusting the position of the charging stand C1 while checking the indicator 89. If the charging stand C1 is equipped with a reflector 70, the user can adjust the relative position of the reflector 70 and the power receiving antenna 83 by rotating the reflector 70 while checking the indicator 89.

[0062] (7) The reflector 70 can rotate until the reflector body 71 comes into contact with the installation surface. This allows the charging stand C1 to stand independently in a stable state. (8) The power receiving antenna 83 is flat. By providing the power receiving antenna 83 so that the thickness direction of the power receiving antenna 83 coincides with the third direction, the dimension of the support part 10 in the third direction is unlikely to become large. This makes it possible to make the charging stand C1 compact.

[0063] (9) The power receiving antenna 83 is flat. When the power receiving antenna 83 is provided along the support part 10, the power receiving antenna 83 can be used as a reinforcing member that reinforces the support part 10. Therefore, deformation of the support part 10 is unlikely to occur, and the power receiving antenna 83 and the parasitic element 100 can be easily maintained facing each other.

[0064] (10) The parasitic element 100 is flat. By arranging the parasitic element 100 so that the thickness direction of the parasitic element 100 coincides with the thickness direction of the interlocking portion main body 41, it is possible to prevent the parasitic element 100 from increasing in size of the charging stand C1.

[0065] (11) The parasitic element 100 is flat. By arranging the parasitic element 100 along the interlocking body 41, the parasitic element 100 can be used as a reinforcing member for reinforcing the interlocking body 41. This makes it difficult for the interlocking body 41 to deform, and makes it easier to maintain a direct confrontation between the power receiving antenna 83 and the parasitic element 100.

[0066] The embodiment can be modified as follows: The embodiment and the following modified examples can be combined with each other to the extent that there is no technical contradiction. As shown in FIGS. 9 and 10, the charging stand C1 may include a control device 110, a motor control circuit 113, a motor 114, a drive gear 115, and a driven gear 116.

[0067] For example, a micro control unit is used as the control device 110. The control device 110 includes a processor 111 and a storage unit 112. The storage unit 112 includes a read only memory (ROM) and a random access memory (RAM).

[0068] The motor control circuit 113 controls the motor 114 in response to a command from the control device 110. For example, the motor control circuit 113 reverses the rotation direction of the motor 114 in response to a command from the control device 110.

[0069] The control device 110 and the motor control circuit 113 are operated by power supplied from the built-in battery 82 via a power supply path (not shown). The drive gear 115 rotates as the motor 114 rotates.

[0070] The driven gear 116 meshes with the drive gear 115. The driven gear 116 rotates with the rotation of the drive gear 115. The rotation direction of the driven gear 116 is the same as the rotation direction of the reflector 70. The driven gear 116 is provided so that the reflector 70 rotates with the rotation of the driven gear 116.

[0071] The control device 110 rotates the motor 114 so that the angle between the reflector 70 and the leg 30 becomes the smallest from the largest angle between the reflector 70 and the leg 30. The reflector 70 rotates toward the leg 30. The control device 110 detects the received power while the reflector 70 is rotating, and stores the angle of the reflector 70 and the received power in the memory unit 112 in association with each other. The detection of the received power is performed by AD-converting the DC voltage of the rectifier circuit 84. When the angle between the reflector 70 and the leg 30 becomes the smallest, the control device 110 determines the angle of the reflector 70 when the received power was the largest. The control device 110 rotates the motor 114 to set the angle of the reflector 70 to the angle when the received power was the largest. This automatically adjusts the relative position between the reflector 70 and the parasitic element 100.

[0072] The control device 110 may rotate the reflector 70 from a state in which the angle between the reflector 70 and the leg 30 is smallest, and detect the received power while the reflector 70 is rotating. The indicator 89 may represent the magnitude of the received power by displaying the value of the received power.

[0073] The indicator 89 may indicate only the magnitude of the received power. In this case, the charging stand C1 does not need to include the switching circuit 88. The LED display circuit 92 is connected to the rectifier circuit 84.

[0074] The indicator 89 may indicate only the charging rate of the built-in battery 82. In this case, the charging stand C1 does not need to include the switching circuit 88. An LED display circuit 92 is connected to the built-in battery 82.

[0075] The charging stand C1 does not have to be equipped with the indicator 89. The reflector 70 may be provided in a detachable manner. The reflector body 71 may be curved. For example, the reflector body 71 may be curved so as to be concave in a direction away from the leg 30. In this case, it is preferable that the reflector body 71 is curved so as to guide the power transmission signal reflected to the power receiving antenna 83 or the parasitic element 100.

[0076] 11 , the reflector 70 may be configured to be able to change its position by an extension mechanism 120. The extension mechanism 120 is, for example, a link mechanism. The extension mechanism 120 is provided, for example, on the rear support part 11. The extension mechanism 120 changes the relative distance between the rear support part 11 and the reflector 70. As a result, the relative position between the reflector 70 and the power receiving antenna 83 can also be changed. The extension mechanism 120 may be provided on the leg part 30.

[0077] The charging stand C1 does not have to include the reflector 70. As long as the power receiving antenna 83 and the parasitic element 100 face each other, the relative distance between the power receiving antenna 83 and the parasitic element 100 may be freely adjustable by a user of the charging stand C1. For example, the parasitic element 100 may be provided on the above-described extension mechanism 120, and the relative distance between the power receiving antenna 83 and the parasitic element 100 may be adjustable by extension or retraction of the extension mechanism 120 in a state where the power receiving antenna 83 and the parasitic element 100 face each other.

[0078] The parasitic element 100 may be attached to the leg 30. Even in this case, the parasitic element 100 is provided so that the relative position between the power receiving antenna 83 and the parasitic element 100 is a predetermined constant position when the leg 30 is in the deployed posture.

[0079] The leg portion 30 may be fixed to the support portion 10. In other words, the leg portion 30 does not have to be provided rotatably with respect to the support portion 10. The charging stand C1 does not have to include the legs 30. In other words, the charging stand C1 may be configured to be self-supporting with only the support parts 10. In this case, the relative positions of the power receiving antenna 83 and the parasitic element 100 are always constant and predetermined.

[0080] Any type of antenna can be used as the power receiving antenna 83. For example, the power receiving antenna 83 may be a loop antenna or a dipole antenna. The shape of the parasitic element 100 may be changed according to the type of the power receiving antenna 83.

[0081] The charging stand C1 does not have to include the built-in battery 82. In this case, the battery 201 of the electronic device 200 may be charged by the power supplied from the charging circuit 85.

[0082] The charging stand C1 may charge the battery 201 by contactless power supply. The charging stand C1 may charge the battery 201 with power from the charging circuit 85 when the charging stand C1 can receive a power transmission signal, and may charge the battery 201 with power from the built-in battery 82 when the charging stand C1 cannot receive a power transmission signal. [Explanation of symbols]

[0083] C1…Charging stand 10...Support part 30...legs 40…Interlocking part 70...Reflector 80...Power receiving device 89…Indicator 200...Electronic devices 201…Battery 300...Power transmission device

Claims

1. A support portion that supports the electronic device; a power receiving device that receives a power transmission signal transmitted from a power transmitting device and charges a battery included in the electronic device; The power receiving device is a receiving antenna for receiving the power transmission signal; a parasitic element for improving the gain characteristics of the receiving antenna, A charging stand configured so that the power receiving antenna and the parasitic element are directly opposite each other.

2. A leg portion is provided so as to be rotatable with respect to the support portion, The leg portion is rotatable between a folded position and an unfolded position, The charging stand according to claim 1 , wherein the power receiving antenna and the parasitic element are configured to face each other directly when the leg portion is in the deployed posture.

3. A linking portion that links with the rotation of the leg portion, The charging stand according to claim 2 , wherein the parasitic element is provided in the interlocking portion.

4. a reflector that reflects the power transmission signal; The charging stand according to any one of claims 1 to 3, wherein the reflector is configured so that a position thereof relative to the power receiving antenna can be changed.

5. The charging stand according to any one of claims 1 to 4, further comprising an indicator that displays a magnitude of received power obtained by receiving the power transmission signal.

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