Power transmission device

Abstract

To provide a power transmission device that suppresses generation of a standing wave while improving efficiency of construction of a wireless power supply system.SOLUTION: In a wireless power supply system, a power transmission device has: first power transmission electrodes 121 formed using a plate-shaped conductor; second power transmission electrodes 122 formed using plate-shaped conductors and having end portions overlapping end portions of the first electrodes; and an electrode-connecting member 123 that connects the first power transmission electrodes and the second power transmission electrodes. The electrode-connecting member has: a thin sheet portion 201 made of a dielectric located between the first power transmission electrodes and the second power transmission electrodes; a first conductive tape 202a attached to one surface of the thin sheet portion; and a second conductive tape 202b attached to the other surface of the thin sheet portion and having at least a partial region O overlapping the first conductive tape. The first power transmission electrodes extend in one direction from one end attached to an outer surface of the first conductive tape along the thin sheet portion. The second power transmission electrodes extend in an opposite direction from one end attached to an outer surface of the second conductive tape.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a power transmitting device. [Background technology]

[0002] In recent years, electric vehicles that run on electricity have become increasingly popular. Electric vehicles run by rotating the wheels by driving a motor using electricity stored in an on-board battery. Therefore, when the amount of electricity stored in the battery decreases, users must connect the electric vehicle to a designated charging facility to charge the battery.

[0003] In response to this, wireless power supply systems that supply power wirelessly to vehicles that use electrical energy as their power source, such as electric cars, electric carts, and AGVs (Automated Guided Vehicles), have been attracting attention. In wireless power supply systems, power is supplied wirelessly and contactlessly from a power transmitting electrode buried under the road surface to a power receiving electrode mounted on the vehicle. Because power is supplied contactlessly, the vehicle can run using power transmitted from the road surface without relying on power from a battery.

[0004] The power transmitting electrode of such a wireless power transfer system has a shape that extends, for example, along a road, and transmits a high-frequency voltage from a high-frequency power source to a vehicle. Therefore, the power transmitting electrode may generate a standing wave due to a mixture of traveling waves from the high-frequency power source toward the vehicle and reflected waves from the vehicle toward the high-frequency power source. When a standing wave occurs in the power transmitting electrode, power is not received by the power receiving electrode at the node of the standing wave, resulting in a decrease in power transmission efficiency.

[0005] Therefore, it has been considered to periodically connect a connection circuit to the power transmission electrode in the electrified road to advance the phase of the traveling wave and the reflected wave, thereby suppressing the occurrence of standing waves at the power transmission electrode (for example, Patent Document 1).

[0006] However, suppressing standing waves using connection circuits requires connecting the connection circuits to the power transmission electrode periodically at intervals of one-quarter wavelength, which reduces construction efficiency and increases costs. For example, if a 10 MHz high-frequency voltage is transmitted using a power transmission electrode, a connection circuit made of electronic components must be buried every 7.5 meters, since one-quarter wavelength is 7.5 meters. Furthermore, because the connection circuits are buried under the road surface where vehicles pass, they must be designed to withstand vibrations caused by running vehicles, which requires costs to ensure their strength and to replace and maintain the connection circuits. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-227025 [Patent Document 2] Japanese Patent Application Laid-Open No. 2017-34919 Summary of the Invention [Problem to be solved by the invention]

[0008] An object of the present invention is to provide a power transmission device that can suppress the occurrence of standing waves while improving the efficiency of installation of a wireless power supply system. [Means for solving the problem]

[0009] According to one aspect of the present invention, a power transmission device includes a first electrode formed using a plate-shaped conductor, a second electrode formed using a plate-shaped conductor and having an end overlapping an end of the first electrode, and an electrode connecting member connecting the first electrode and the second electrode, wherein the electrode connecting member includes a thin plate portion made of a dielectric located between the first electrode and the second electrode, a first conductive tape attached to one side of the thin plate portion, and a second conductive tape attached to the other side of the thin plate portion and having at least a portion overlapping with the first conductive tape, wherein the first electrode extends in one direction along the thin plate portion from one end adhered to the outer surface of the first conductive tape, and the second electrode extends in the opposite direction from one end adhered to the outer surface of the second conductive tape.

[0010] According to this configuration, a conductor including a first electrode and a first conductive tape and a conductor including a second electrode and a second conductive tape form a capacitor sandwiching a thin plate portion, and since the areas of the opposing conductors in this capacitor are constant, the capacitance of the capacitor can be kept constant and the capacitance of the capacitor can be accurately set, thereby suppressing the occurrence of standing waves in the power supply line. Furthermore, since it is only necessary for one ends of the first electrode and one end of the second electrode to be adhered to the outer surfaces of the first conductive tape and the second conductive tape, respectively, misalignment of the first electrode and the second electrode during installation can be tolerated, thereby improving installation efficiency.

[0011] According to another aspect of the present invention, in the above configuration, the electrode connecting member further includes a first thick plate portion having a first step surface rising from one surface of the thin plate portion and abutting the end surface of the first conductive tape against the first step surface, and a second thick plate portion having a second step surface rising from the other surface of the thin plate portion and abutting the end surface of the second conductive tape against the second step surface.

[0012] According to this configuration, the end faces of the first conductive tape and the second conductive tape are abutted against the first step surface and the second step surface, thereby preventing the tips of the first electrode and the second electrode from protruding from the attachment areas of the first conductive tape and the second conductive tape.

[0013] According to another aspect of the present invention, in the above configuration, the first conductive tape has an area on the opposite side of one end of the first electrode adhered to the outer surface that does not overlap with the second conductive tape, and the second conductive tape has an area on the one side of one end of the second electrode adhered to the outer surface that does not overlap with the first conductive tape.

[0014] According to this configuration, the first conductive tape and the second conductive tape attached to both sides of the thin plate portion have an area where they do not overlap, making it unnecessary to precisely align the first conductive tape and the second conductive tape.

[0015] According to another aspect of the present invention, in the above configuration, at least one of the first conductive tape and the second conductive tape is made of SUS (Steel Use Stainless), copper, aluminum, zinc, or iron.

[0016] With this configuration, the conductive tape and the electrodes can be made of the same low-resistance metal, which makes the characteristics of the conductors that form the capacitor uniform and makes it easier to set the capacitance.

[0017] According to another aspect of the present invention, the power transmission device, in the above configuration, further includes a fixing member that penetrates the first electrode, the second electrode, or the electrode connecting member and fixes the first electrode, the second electrode, or the electrode connecting member to an installation surface on which the power transmission device is installed.

[0018] According to this configuration, the positions of the first electrode, the second electrode, or the electrode connecting member can be fixed, and stable power transmission from the power transmission device can be achieved. [Effects of the Invention]

[0019] According to the present invention, it is possible to suppress the occurrence of standing waves while improving the efficiency of installation of a wireless power supply system. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is a diagram showing a specific example of the configuration of a wireless power supply system according to an embodiment. [Figure 2] FIG. 2 is a schematic plan view showing the configuration of a power transmission layer according to one embodiment. [Figure 3] FIG. 3 is a circuit configuration diagram corresponding to the power transmission layer according to one embodiment. [Figure 4] FIG. 4 is a diagram illustrating a configuration of a power transmission electrode according to one embodiment. [Figure 5] FIG. 5 is a side view showing the configuration of an electrode connecting member according to one embodiment. [Figure 6] FIG. 6 is a diagram showing a specific example of power transmission efficiency. [Figure 7] FIG. 7 is a diagram showing the configuration of a power transmitting electrode according to another embodiment. [Figure 8] FIG. 8 is a perspective view showing the configuration of an electrode connecting member according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0021] An embodiment of the present invention will be described below with reference to the accompanying drawings. The embodiment described below is an example and should not be construed as being limited by this description.

[0022] Fig. 1 is a diagram showing a specific example of the configuration of a wireless power supply system 100 according to an embodiment. The wireless power supply system 100 shown in Fig. 1 is installed on a road on which a vehicle 10 travels, and supplies power to the traveling vehicle 10 using electric power. The wireless power supply system 100 has a surface layer 110, a power transmission layer 120, a drainage layer 130, and a base layer 140.

[0023] The surface layer 110 is a layer formed using, for example, an asphalt mixture using ceramic aggregate, and the vehicle 10 runs on the surface layer 110.

[0024] The power transmission layer 120 transmits high-frequency energy from the high-frequency power source to the vehicle 10. Specifically, the power transmission layer 120 has a plurality of first power transmission electrodes 121 embedded shallowly near the underside of the surface layer 110, and a plurality of second power transmission electrodes 122 embedded deeper than the first power transmission electrodes 121. Both ends of the first power transmission electrodes 121 and the second power transmission electrodes 122 overlap each other in a plan view and are connected by an electrode connecting member (not shown in FIG. 1 ). The entire upper and lower surfaces of the first power transmission electrode 121, the second power transmission electrode 122, and the electrode connecting member are covered with a bitumen sheet (not shown), and the surrounding area is filled with, for example, crushed ceramic stone. In addition, an asphalt stabilization layer (not shown) may be provided below the power transmission layer 120.

[0025] The power transmission layer 120 transmits high-frequency energy through the first power transmission electrode 121 and the second power transmission electrode 122, and supplies power to a power receiving electrode (not shown) of the vehicle 10. The configuration of the power transmission layer 120 will be described in detail later.

[0026] The drainage layer 130 is formed using, for example, a resin product with drainage properties, and promotes drainage from the power transmission layer 120 .

[0027] The base layer 140 is a layer formed using, for example, an asphalt mixture using ceramic aggregate, and is formed on the top surface of the roadbed to support the surface layer 110, the power transmission layer 120, and the drainage layer 130.

[0028] Fig. 2 is a schematic plan view showing the configuration of the power transmission layer 120 according to one embodiment. Fig. 2 shows the configuration of a power transmission device related to power transmission.

[0029] 2, the power transmission device of the power transmission layer 120 has two power transmission lines arranged side by side in parallel, and each power transmission line is formed by connecting a first power transmission electrode 121 and a second power transmission electrode 122 by an electrode connection member 123. Specifically, the first power transmission electrodes 121 buried at a shallow position and the second power transmission electrodes 122 buried at a deep position are arranged alternately, and ends of the first power transmission electrodes 121 and the second power transmission electrodes 122 that are adjacent to each other in a planar view are connected by the electrode connection member 123. The ends of the first power transmission electrode 121 and the second power transmission electrode 122 have an overlapping region in a planar view, and face each other across the electrode connection member 123 in this region.

[0030] The first power transmission electrode 121 and the second power transmission electrode 122 are each formed from a thin plate-shaped conductor with a width of 800 to 850 mm and a length of 2000 mm, for example. The lengths of the first power transmission electrode 121 and the second power transmission electrode 122 are shorter than the wavelength of the high frequency wave transmitted by the power supply line. Each power supply line is formed by connecting, for example, five first power transmission electrodes 121 and five second power transmission electrodes 122, and is a line with a total length of about 20 m.

[0031] The electrode connection member 123 is formed by attaching thin-film conductive tape to both sides of a plate-shaped member made of a dielectric material such as resin. Specifically, the electrode connection member 123 is formed by attaching thin-film conductive tape having overlapping regions to portions of both sides of a plate-shaped member that is heat-resistant up to 160°C, has a load-bearing capacity up to a linear pressure of 49 kN, is non-water-absorbent, and is insulating. Examples of materials for the plate-shaped member include resins such as polytetrafluoroethylene (PTFE), polypropylene, polyethylene, and polyacetal, as well as glass fibers impregnated with these resins. Examples of materials for the conductive tape include low-resistance metals such as SUS (Steel Use Stainless Steel), copper, aluminum, zinc, and iron.

[0032] The material of the conductive tape is preferably the same metal as the material of the first power transmission electrode 121 and the second power transmission electrode 122. By using the same material for the first power transmission electrode 121, the second power transmission electrode 122, and the conductive tape, the conductor characteristics of the capacitor formed by the first power transmission electrode 121, the second power transmission electrode 122, and the conductive tape can be made uniform, making it easier to set the capacitance.

[0033] Ends of the first power transmission electrode 121 and the second power transmission electrode 122 are connected to the conductive tapes on both sides of the electrode connection member 123. That is, the first power transmission electrode 121 is adhered to the conductive tape on one side of the electrode connection member 123, and the second power transmission electrode 122 is adhered to the conductive tape on the other side of the electrode connection member 123. As a result, the first power transmission electrode 121 and the conductive tape, which are conductors, and the second power transmission electrode 122 and the conductive tape face each other with the plate-like member, which is a dielectric, sandwiched between them, forming a capacitor at the position of the electrode connection member 123. The configuration of the electrode connection member 123 will be described in detail later.

[0034] High frequency power supply 124 is connected to one end of each of the two power supply lines, and inductor 125 is also connected to the other end of each of the two power supply lines, which is farther from high frequency power supply 124, and inductor 126 is connected to the other end of each of the two power supply lines.

[0035] With these capacitors and inductors 125, 126, the power transmission line of the power transmission layer 120 can be represented by, for example, the equivalent circuit shown in Fig. 3. That is, as shown in Fig. 3, the power transmission layer 120 has inductors with inductance L at one end close to the high-frequency power supply 124 and the other end far from the high-frequency power supply 124, and has a capacitor with capacitance C at a position where the first power transmission electrode 121 and the second power transmission electrode 122 are connected by the electrode connection member 123.

[0036] In this circuit configuration, by appropriately setting the inductance L of the inductor and the capacitance C of the capacitor, the phases of the forward and reflected high-frequency waves transmitted through the power supply line are adjusted at the capacitor position. As a result, the generation of standing waves due to the combination of the forward and reflected waves is suppressed, and standing wave nodes that reduce power transmission efficiency are not formed.

[0037] Incidentally, in order to suppress the occurrence of standing waves in the power transmission layer 120, it is necessary to accurately set the capacitance C of the capacitor formed at the end of the first power transmission electrode 121 and the second power transmission electrode 122. The capacitance C of the capacitor is calculated by the following formula (1). C=εr·ε0·S / d (1)

[0038] In equation (1), εr is the relative permittivity of the dielectric that forms the plate-like member of the electrode connecting member 123, ε0 is the permittivity of a vacuum, S is the area of ​​the region where the first power transmitting electrode 121, the second power transmitting electrode 122, and the conductor made of the conductive tape face each other across the plate-like member, and d is the thickness of the plate-like member.

[0039] Therefore, by accurately adjusting the area S of the region where the conductors made of the first power transmission electrode 121, the second power transmission electrode 122, and the conductive tape face each other across the plate-like member, and the thickness d of the plate-like member, a capacitor with the desired capacitance C can be formed, and the occurrence of standing waves can be suppressed. In other words, by connecting the first power transmission electrode 121 and the second power transmission electrode 122 with the electrode connection member 123 including the conductive tape, it is possible to form a power transmission layer 120 that improves power transmission efficiency.

[0040] Hereinafter, the connection portion between the first power transmission electrode 121 and the second power transmission electrode 122 using the electrode connection member 123 will be specifically described with reference to FIG.

[0041] FIG. 4(a) is a plan view showing the connection portion between the first power transmission electrode 121 and the second power transmission electrode 122, and FIG. 4(b) is a schematic cross-sectional view taken along line II in FIG. 4(a).

[0042] As shown in these figures, the ends of the first power transmission electrode 121 and the second power transmission electrode 122 have an overlapping region, and the electrode connection member 123 is sandwiched in this region. In other words, the end of the first power transmission electrode 121 and the end of the second power transmission electrode 122 face each other with the electrode connection member 123 in between. Furthermore, conductive tapes having overlapping regions are attached to both surfaces of the electrode connection member 123, with one end of the first power transmission electrode 121 attached to the conductive tape on one surface and one end of the second power transmission electrode 122 attached to the conductive tape on the other surface. The first power transmission electrode 121 extends in one direction along the surface of the electrode connection member 123 from its end attached to the conductive tape, and the second power transmission electrode 122 extends in the opposite direction to the one direction in which the first power transmission electrode 121 extends from its end attached to the conductive tape.

[0043] The first power transmission electrode 121 and the second power transmission electrode 122 are fixed in position on the power transmission layer 120 by screws 127 penetrating through areas that do not overlap with the electrode connection member 123. Similarly, the electrode connection member 123 is fixed in position on the power transmission layer 120 by screws 128 penetrating through areas that do not overlap with the first power transmission electrode 121 and the second power transmission electrode 122.

[0044] The screws 127 and 128 are formed using, for example, a conductor, but none of the screws 127 and 128 penetrates the first power transmission electrode 121, the second power transmission electrode 122, and the electrode connection member 123 in common, and therefore the first power transmission electrode 121, the second power transmission electrode 122, and the electrode connection member 123 are electrically connected by the screws 127 and 128. The positions of the first power transmission electrode 121, the second power transmission electrode 122, and the electrode connection member 123 are fixed by the screws 127 and 128, thereby realizing stable power transmission from the power supply line.

[0045] As described above, one end of the first power transmission electrode 121 is bonded to the conductive tape on one surface of the electrode connection member 123, and one end of the second power transmission electrode 122 is bonded to the conductive tape on the other surface of the electrode connection member 123. Therefore, in the region W shown in FIG. 4(b), the conductors face each other, forming a capacitor. Here, if one end of the first power transmission electrode 121 and one end of the second power transmission electrode 122 are bonded to the conductive tape, respectively, the area S of the facing conductors in this capacitor is constant. In other words, in the region W, the area occupied by the first power transmission electrode 121 and the conductive tape on one surface of the electrode connection member 123 and the area occupied by the second power transmission electrode 122 and the conductive tape on the other surface of the electrode connection member 123 are constant as long as one end of the first power transmission electrode 121 and one end of the second power transmission electrode 122 are bonded to the conductive tape.

[0046] As a result, the capacitance C of the capacitor calculated by the above formula (1) is constant as long as one end of the first power transmission electrode 121 and one end of the second power transmission electrode 122 are adhered to the conductive tape, and the capacitance C of the capacitor can be set accurately to suppress the occurrence of standing waves in the power supply line.

[0047] Fig. 5 is a side view showing the structure of electrode connecting member 123 according to one embodiment. As shown in Fig. 5, electrode connecting member 123 has thin plate portion 201 and conductive tapes 202a and 202b.

[0048] The thin plate portion 201 is a plate-like member formed using a dielectric material, and has a surface 201a on the side where the first power transmitting electrode 121 is arranged, and a surface 201b on the side where the second power transmitting electrode 122 is arranged. The thin plate portion 201 may be formed using, for example, a resin such as fluororesin, polypropylene, polyethylene, or Duracon, or glass fiber impregnated with any of these resins.

[0049] The conductive tape 202a is a conductive thin film that is attached to cover a portion of the surface 201a of the thin plate portion 201. Similarly, the conductive tape 202b is a conductive thin film that is attached to cover a portion of the surface 201b of the thin plate portion 201. The conductive tapes 202a and 202b overlap each other in at least a portion O. The conductive tapes 202a and 202b may be made of a low-resistance metal such as SUS, copper, aluminum, zinc, or iron. Preferably, the conductive tapes 202a and 202b are made of the same metal as the material of the first power transmitting electrode 121 and the second power transmitting electrode 122.

[0050] When the electrode connection member 123 connects the first power transmission electrode 121 and the second power transmission electrode 122, one end of the first power transmission electrode 121 is adhered to the outer surface of the conductive tape 202a, and the first power transmission electrode 121 extends in one direction along the thin plate portion 201 from the end adhered to the conductive tape 202a. That is, in FIG. 5 , the first power transmission electrode 121 extends leftward from the end adhered to the conductive tape 202a. Also, one end of the second power transmission electrode 122 is adhered to the outer surface of the conductive tape 202b, and the second power transmission electrode 122 extends from the end adhered to the conductive tape 202b in the opposite direction to the extending direction of the first power transmission electrode 121. That is, in FIG. 5 , the second power transmission electrode 122 extends rightward from the end adhered to the conductive tape 202b.

[0051] In this case, the conductive tape 202a may have a region that does not overlap with the conductive tape 202b on the side in the direction in which the second power transmission electrode 122 extends (the right side in FIG. 5 ) of one end of the first power transmission electrode 121 that is adhered to the outer surface, and the conductive tape 202b may have a region that does not overlap with the conductive tape 202b on the side in the direction in which the first power transmission electrode 121 extends (the left side in FIG. 5 ) of one end of the second power transmission electrode 122 that is adhered to the outer surface. By allowing the conductive tapes 202a and 202b to have regions in which they do not overlap with each other, accurate alignment of the conductive tapes 202a and 202b in the electrode connection member 123 can be eliminated.

[0052] In this way, the electrode connection member 123 connects the first power transmission electrode 121 and the second power transmission electrode 122, so that in the region W, a conductor including the first power transmission electrode 121 and the conductive tape 202a and a conductor including the second power transmission electrode 122 and the conductive tape 202b face each other across the thin plate portion 201 of the dielectric, thereby forming a capacitor.

[0053] Because the first power transmission electrode 121 and the second power transmission electrode 122 are electrodes with a constant width, the area of ​​the conductors facing each other across the thin plate portion 201 in the region W is constant as long as one end of the first power transmission electrode 121 and the second power transmission electrode 122 is adhered to the outer surfaces of the conductive tapes 202a and 202b, respectively. Furthermore, because the thickness of the thin plate portion 201 is also constant, even if the positions of the one ends of the first power transmission electrode 121 and the second power transmission electrode 122 are misaligned, the capacitance of the capacitor formed in the region W is constant. Therefore, the capacitance of the capacitor can be accurately set, thereby suppressing the occurrence of standing waves in the power feed line. Furthermore, because it is sufficient that one ends of the first power transmission electrode 121 and the second power transmission electrode 122 are adhered to the outer surfaces of the conductive tapes 202a and 202b, respectively, misalignment of the first power transmission electrode 121 and the second power transmission electrode 122 during construction can be tolerated, improving construction efficiency.

[0054] Fig. 6 is a diagram showing an example of the relationship between the power receiving position indicated by the distance from the high-frequency power source 124 and the power transmission efficiency. In Fig. 6, the solid line indicates the power transmission efficiency of the power feed line of the power transmission layer 120 described above, and the dashed line indicates the power transmission efficiency of a conventional continuous power feed line.

[0055] As shown in Fig. 6, when power is transmitted via a continuous power feed line, the power transmission efficiency drops significantly at a power receiving position that is approximately 8 m away from the high-frequency power supply 124. This is because standing waves occur in the power feed line, and a node of the standing wave is formed at this power receiving position. In contrast, when power is transmitted via the power feed line of the power transmission layer 120, although the power transmission efficiency drops gradually as the distance from the high-frequency power supply 124 increases, there is no power receiving position where the power transmission efficiency drops significantly. In this way, the power feed line of the power transmission layer 120 can suppress the generation of standing waves and the decrease in power transmission efficiency.

[0056] As described above, according to this embodiment, in a power supply line having a first power transmission electrode and a second power transmission electrode arranged so that their ends overlap, an electrode connection member is arranged on both sides of a thin plate portion made of a dielectric material, with conductive tape attached to at least a partial overlapping area, and one end of the first power transmission electrode is attached to the conductive tape attached to one side, and one end of the second power transmission electrode is attached to the conductive tape attached to the other side. This makes it possible to maintain a constant area between the conductors facing each other across the thin plate portion, and to accurately set the capacitance of the capacitor formed at the position of the electrode connection member, thereby adjusting the phases of the traveling wave and the reflected wave. As a result, the installation of a wireless power supply system can be made more efficient while suppressing the generation of standing waves.

[0057] (Other embodiments) The configuration of the electrode connecting member 123 is not limited to that according to the above embodiment. For example, the electrode connecting member 123 may be provided with a thick plate portion that restricts excessive positional deviation between the first power transmitting electrode 121 and the second power transmitting electrode 122. Other embodiments of such an electrode connecting member 123 will be described below.

[0058] 7 is a side view showing a connection portion between a first power transmission electrode 121 and a second power transmission electrode 122 according to another embodiment. In FIG. 7, the same parts as in FIG. 4 are denoted by the same reference numerals.

[0059] 7 , the ends of the first power transmission electrode 121 and the second power transmission electrode 122 have an overlapping region, and the electrode connection member 150 is sandwiched in this region. In other words, the end of the first power transmission electrode 121 and the end of the second power transmission electrode 122 face each other with the electrode connection member 150 in between. Furthermore, conductive tapes having overlapping regions are attached to both surfaces of the electrode connection member 150, with one end of the first power transmission electrode 121 bonded to the conductive tape on one surface and one end of the second power transmission electrode 122 bonded to the conductive tape on the other surface. The first power transmission electrode 121 extends in one direction along the surface of the electrode connection member 150 from its end bonded to the conductive tape, and the second power transmission electrode 122 extends in the opposite direction to the one direction in which the first power transmission electrode 121 extends from its end bonded to the conductive tape.

[0060] Thick plate portions are formed on both ends of the electrode connection member 150, and one end face of the conductive tape abuts on a stepped surface that constitutes the thick plate portion. That is, the conductive tape is attached to a thin plate portion in the center of the electrode connection member 150, and one end face of the conductive tape abuts on a stepped surface that rises from the surface of the thin plate portion at the boundary with the thick plate portions on both ends of the electrode connection member 150. This configuration can prevent one ends of the first power transmission electrode 121 and the second power transmission electrode 122 from protruding from the area where the conductive tape is attached.

[0061] Fig. 8 is a perspective view showing the structure of an electrode connecting member 150 according to another embodiment. As shown in Fig. 8, the electrode connecting member 150 has a thin plate portion 211, thick plate portions 212 and 213, and conductive tapes 202a and 202b.

[0062] The thin plate portion 211 is a plate-shaped portion formed using a dielectric material, and has a surface 211a on the side where the first power transmission electrode 121 is arranged, and a surface 211b on the side where the second power transmission electrode 122 is arranged.

[0063] The thick plate portion 212 is a thick portion formed continuously from one end of the thin plate portion 211, and has a step surface 212a that rises from the surface 211a of the thin plate portion 211, and a through hole 212b through which a screw for fixing the electrode connection member 150 is passed.

[0064] The thick plate portion 213 is a thick portion formed continuously from the other end of the thin plate portion 211, and has a step surface 213a that stands up from the surface 211b of the thin plate portion 211, and a through hole 213b through which a screw for fixing the electrode connection member 150 is passed.

[0065] The conductive tape 202a is a conductive thin film that is attached to cover a portion of the surface 211a of the thin plate portion 211. Similarly, the conductive tape 202b is a conductive thin film that is attached to cover a portion of the surface 211b of the thin plate portion 211. The conductive tapes 202a and 202b overlap each other in at least a partial area. One end surface of the conductive tape 202a abuts against the stepped surface 212a of the thick plate portion 212, and one end surface of the conductive tape 202b abuts against the stepped surface 213a of the thick plate portion 213.

[0066] In this way, by abutting one end surfaces of the conductive tapes 202a and 202b against the stepped surfaces 212a and 213a of the thick plate portions 212 and 213, the tips of the first power transmission electrode 121 and the second power transmission electrode 122 can be prevented from protruding from the attachment areas of the conductive tapes 202a and 202b. That is, when connecting the first power transmission electrode 121 to the electrode connecting member 150, the stepped surface 212a prevents the tip of the first power transmission electrode 121, which enters along the surface 211a from the thick plate portion 213 side, from going beyond the attachment area of ​​the conductive tape 202a. Similarly, when connecting the second power transmission electrode 122 to the electrode connecting member 150, the stepped surface 213a prevents the tip of the second power transmission electrode 122, which enters along the surface 211b from the thick plate portion 212 side, from going beyond the attachment area of ​​the conductive tape 202b.

[0067] This prevents fluctuations in the area of ​​the conductors facing each other across the thin plate portion 211 due to the tip of the first power transmission electrode 121 or the second power transmission electrode 122 protruding from the attachment area of ​​the conductive tapes 202a, 202b, and makes it possible to keep the capacitance of the capacitor formed in the electrode connection member 150 constant. [Explanation of symbols]

[0068] 110 Surface layer 120 Power Transmission Layer 121 First power transmission electrode 122 Second power transmission electrode 123, 150 Electrode connecting member 124 High frequency power supply 125, 126 Inductors 127, 128 bis 130 Drainage layer 140 Base layer 201, 211 Thin plate part 202a, 202b Conductive tape 212, 213 Thick plate section 212a, 213a Step surface 212b, 213b through hole

Claims

1. a first electrode formed using a plate-shaped conductor; a second electrode formed using a plate-shaped conductor and having an end portion overlapping an end portion of the first electrode; an electrode connecting member that connects the first electrode and the second electrode, The electrode connecting member is a thin plate portion made of a dielectric material and positioned between the first electrode and the second electrode; a first conductive tape attached to one surface of the thin plate portion; a second conductive tape attached to the other surface of the thin plate portion, the second conductive tape overlapping the first conductive tape in at least a partial area; The first electrode is the first conductive tape extends in one direction along the thin plate portion from one end thereof bonded to the outer surface of the first conductive tape; The second electrode is The second conductive tape has an end that is bonded to the outer surface of the second conductive tape and extends in a direction opposite to the one direction. Power transmission equipment.

2. The electrode connecting member is a first thick plate portion having a first stepped surface rising from one surface of the thin plate portion, the first stepped surface being in contact with an end surface of the first conductive tape; a second thick plate portion having a second stepped surface rising from the other surface of the thin plate portion, and an end surface of the second conductive tape being brought into contact with the second stepped surface; The power transmitting device according to claim 1 .

3. The first conductive tape comprises: a region on the opposite side of one end of the first electrode bonded to the outer surface that does not overlap with the second conductive tape; The second conductive tape comprises: a region on the one side of one end of the second electrode bonded to the outer surface that does not overlap with the first conductive tape; The power transmitting device according to claim 1 .

4. At least one of the first conductive tape and the second conductive tape is Made of SUS (Steel Use Stainless), copper, aluminum, zinc or iron The power transmitting device according to claim 1 .

5. The power transmitting device further includes a fixing member that penetrates the first electrode, the second electrode, or the electrode connecting member and fixes the first electrode, the second electrode, or the electrode connecting member to an installation surface on which the power transmitting device is installed. The power transmitting device according to claim 1 .

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