Field resonance type wireless power transmission coupler, and field resonance type wireless power transmission system

Abstract

To provide a field resonance type wireless power transmission coupler capable of finely adjusting a positional relation between each electrode and each auxiliary electrode with a simple step to improve transmission efficiency.SOLUTION: A field resonance type wireless power transmission coupler 1 transmits power wirelessly from a power transmitting coupler 2 to a power receiving coupler 3. The power transmitting coupler 2 has a first electrode EL1 and a second electrode EL2. The power receiving coupler 3 has a third electrode EL3 and a fourth electrode EL4 that are arranged in opposing positions. The power transmitting coupler 2 has: a grounded first conductive flat plate CP1; a first parasitic electrode Es1 that is electrically connected to the first electrode EL1, opposes the first conductive plate CP1 and forms a first capacitance; and a first adjusting mechanism AM1 that variably changes a distance d1 between the first parasitic electrode Es1 and the first conductive flat plate CP1. The power transmitting coupler 2 and the power receiving coupler 3 are also arranged in opposing positions.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an electric field resonance type wireless power transmission coupler and an electric field resonance type wireless power transmission system.

Background Art

[0002] Conventionally, with the spread of mobile phones, electric vehicles, etc., the development of an electric field resonance type wireless power transmission system that supplies power wirelessly has been actively carried out. Electric field resonance is caused by a coupler composed of a power transmission side electrode and a power reception side electrode, and power is transmitted wirelessly. In order to improve the power transmission efficiency, a power transmission LC resonance circuit and a power reception LC resonance circuit are set so that the frequency of the input power matches the resonance frequency. In order to set the capacitance of each of the power transmission and reception couplers, a method of setting the position between the electrode and the shield case has been proposed. There is Patent Document 1 that describes this type of technology. In Patent Document 1, an auxiliary electrode that conducts with the power transmission electrode and an auxiliary electrode that conducts with the power reception electrode are provided, and the distance between each auxiliary electrode and the shield case is adjusted so that the potential of the shield case becomes the ground potential.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In order to adjust the positional relationship between each electrode and each auxiliary electrode, it is necessary to remove the electrode once, and the process is complicated. Furthermore, since there is no adjustment mechanism, height adjustment cannot be performed continuously, so fine adjustment is difficult. Also, adjustment using a spacer results in variation in a predetermined unit (for example, in units of 1 mm), and fine adjustment cannot be performed, which is insufficient for improving the transmission efficiency.

[0005] The present invention aims to provide an electric field resonance type wireless power transmission coupler and an electric field resonance type wireless power transmission system that can precisely adjust the positional relationship between each electrode and each auxiliary electrode in a simple process, thereby improving transmission efficiency. [Means for solving the problem]

[0006] (1) An electric field resonance type wireless power transmission coupler that wirelessly transmits power from a power transmission coupler to a power reception coupler, wherein the power transmission coupler has a first electrode and a second electrode arranged at a predetermined distance apart, and the power reception coupler has a third electrode and a fourth electrode arranged at a predetermined distance apart, the first electrode and the third electrode are arranged opposite each other, and the second electrode and the fourth electrode are arranged opposite each other, and the power transmission coupler has a grounded first conductive plate, a first unpowered electrode that is electrically connected to the first electrode and is arranged opposite the first conductive plate to form a first capacitance, and a second electrode that is electrically connected to the second electrode and is arranged opposite the first conductive plate to form a second capacitance The power receiving coupler includes two passive electrodes, a first adjustment mechanism for varying the distance between the first passive electrode and the first conductive plate, and a second adjustment mechanism for varying the distance between the second passive electrode and the first conductive plate. The power receiving coupler includes a grounded second conductive plate, a third passive electrode which is electrically connected to the third electrode and positioned opposite the second conductive plate to form a third capacitance, a fourth passive electrode which is electrically connected to the fourth electrode and positioned opposite the second conductive plate to form a fourth capacitance, a third adjustment mechanism for varying the distance between the third passive electrode and the second conductive plate, and a fourth adjustment mechanism for varying the distance between the fourth passive electrode and the second conductive plate.

[0007] (2) In the field resonance type wireless power transmission coupler of (1), the first adjustment mechanism has a first spiral rod that is rotatable connecting the first passive electrode and the first conductive plate and is screwed to the first conductive plate, and a first engaging member that is fixed to the first spiral rod and engages with the first passive electrode, and the second adjustment mechanism has a second spiral rod that is rotatable connecting the second passive electrode and the first conductive plate and is screwed to the first conductive plate, and a second engaging member that is fixed to the second spiral rod and engages with the second passive electrode The third adjustment mechanism has a second engaging member that engages with the third passive electrode and the second conductive plate, a third spiral rod that is rotatable connecting the third passive electrode and the second conductive plate and is screwed into the second conductive plate, and a third engaging member that is fixed to the third spiral rod and engages with the third passive electrode, and the fourth adjustment mechanism has a fourth spiral rod that is rotatable connecting the fourth passive electrode and the second conductive plate and is screwed into the second conductive plate, and a fourth engaging member that is fixed to the fourth spiral rod and engages with the fourth passive electrode.

[0008] (3) In the field resonance type wireless power transmission coupler of (2), the first helical rod to the fourth helical rod and the first engaging member to the fourth engaging member are insulating.

[0009] (4) In any of the field resonance type wireless power transmission couplers described in (1) to (3), the first electrode and the first passive electrode, the second electrode and the second passive electrode, the third electrode and the third passive electrode, and the fourth electrode and the fourth passive electrode are each connected and electrically connected by a first conductive variable-length member that generates tension when extended from a predetermined length to a fourth conductive variable-length member.

[0010] In the field resonance type wireless power transmission coupler of (5)(4), the first to fourth adjustment mechanisms are provided near the four corners of the first to fourth passive electrodes, respectively, and the first to fourth conductive variable length members are provided near the center of the first to fourth passive electrodes, respectively.

[0011] In the field resonance type wireless power transmission coupler of (6)(4), the first to fourth adjustment mechanisms are provided near the center of the first to fourth passive electrodes, respectively, and the first to fourth conductive variable length members are provided near the four corners of the first to fourth passive electrodes, respectively.

[0012] (7) In any of the field resonance type wireless power transmission couplers described in (1) to (4), the first passive electrode and the second passive electrode are fixed on a first insulating plate, and a single adjustment mechanism having the same configuration as the first or second adjustment mechanism is provided in the center of the first insulating plate, and the third passive electrode and the fourth passive electrode are fixed on a second insulating plate, and a single adjustment mechanism having the same configuration as the third or fourth adjustment mechanism is provided near the center of the second insulating plate.

[0013] (8) In the field resonance type wireless power transmission coupler of (1), the first adjustment mechanism has a first helical rod that is rotatable connecting the first passive electrode and the first conductive plate and that screws into the first passive electrode; the second adjustment mechanism has a second helical rod that is rotatable connecting the second passive electrode and the first conductive plate and that screws into the second passive electrode; the third adjustment mechanism has a third helical rod that is rotatable connecting the third passive electrode and the second conductive plate and that screws into the third passive electrode; and the fourth adjustment mechanism has a fourth helical rod that is rotatable connecting the fourth passive electrode and the second conductive plate and that screws into the fourth passive electrode.

[0014] (9) An electric field resonance type wireless power transmission system comprising an electric field resonance type wireless power transmission coupler of any of (1) to (8) and a power supply, which supplies power to a load.

[0015] (10) A power transmission coupler or power reception coupler applicable to any of the field resonance type power transmission couplers described in (1) through (9). [Effects of the Invention]

[0016] According to the present invention, there are provided an electric field resonance type wireless power transmission coupler and an electric field resonance type wireless power transmission system capable of finely adjusting the positional relationship between each electrode and each auxiliary electrode in a simple process and improving the transmission efficiency.

Brief Description of the Drawings

[0017] [Figure 1] It is an overall perspective view of an electric field resonance type wireless power transmission coupler according to a first embodiment of the present invention. [Figure 2] It is a cross-sectional view (partial side view) of an adjustment mechanism according to a first embodiment of the present invention. [Figure 3] [[ID=1!4]]It is a schematic diagram of a circuit configuration of an electric field resonance type wireless power transmission coupler according to a first embodiment of the present invention. [Figure 4] It is a diagram showing the relationship between the distance between the non-powered electrode and the conductive flat plate of an electric field resonance type wireless power transmission coupler according to a first embodiment of the present invention and the capacitance formed. [Figure 5] It is a diagram showing the relationship between the distance between the non-powered electrode and the conductive flat plate of an electric field resonance type wireless power transmission coupler according to a first embodiment of the present invention and the resonance frequency. [Figure 6] It is a cross-sectional view (partial side view) of an adjustment mechanism according to Modification 1 of the present invention. [Figure 7A] It is an overall perspective view of an electric field resonance type wireless power transmission coupler according to a second embodiment of the present invention. [Figure 7B] It is a cross-sectional view (partial side view) of an adjustment mechanism according to a second embodiment of the present invention. [Figure 8A] It is an overall perspective view of a power transmission coupler according to a third embodiment of the present invention. [Figure 8B] It is a cross-sectional view (partial side view) of an adjustment mechanism according to a third embodiment of the present invention. [Figure 9] It is a cross-sectional view (partial side view) of an adjustment mechanism according to Modification 2 of the present invention. <000009!3>

Modes for Carrying Out the Invention

[0018] It should be noted that in the above translation, the text tags are preserved as required, and the line breaks are maintained. For the 7-digit tags like [Figure 7B] , they are kept unchanged. The translation is done according to the rules of patent text translation. If there are any specific requirements or corrections needed, please let me know. Also, it seems there might be some numbering irregularities in the original text (e.g., ID=!4, ID=40's <000009!3>), which might need to be clarified in the original source for a more accurate translation.Hereinafter, an electric field resonance type wireless power transmission coupler 1 and an electric field resonance type wireless power transmission system according to embodiments of the present invention will be described with reference to the drawings. In each figure, the same components are denoted by the same reference numeral. Furthermore, components that have similar functions and do not need to be distinguished are not distinguished by their reference numerals. If components have similar functions but need to be distinguished, additional numbers or the like are added to their reference numerals to distinguish them from each other.

[0019] (First Embodiment) Figure 1 is a perspective view of an electric field resonance type wireless power transmission coupler 1 according to the first embodiment of the present invention. The electric field resonance type wireless power transmission coupler 1 according to the first embodiment is an electric field resonance type wireless power transmission coupler that wirelessly transmits power from a power transmission coupler 2 to a power receiving coupler 3. The electric field resonance type wireless power transmission system includes the electric field resonance type wireless power transmission coupler shown in Figure 1, a power supply 4 and a load 5, which are not shown in Figure 1.

[0020] The power transmission coupler 2 has a first electrode EL1 and a second electrode EL2 arranged at a predetermined distance apart, and the power receiving coupler 3 has a third electrode EL3 and a fourth electrode EL4 arranged at a predetermined distance apart. The first electrode EL1 and the third electrode EL3 are arranged opposite each other, and the second electrode EL2 and the fourth electrode EL4 are arranged opposite each other. Power is supplied to the power transmission coupler 2 from a power source 4 (not shown in Figure 1) through wires (not shown in Figure 1). Power is also supplied to the power receiving coupler 3 to a load 5 (not shown in Figure 1) through wires (not shown in Figure 1).

[0021] The power transmission coupler 2 includes a grounded first conductive plate CP1, a first electrode EL1, and a first passive electrode Es1 which is electrically connected to the first electrode EL1 through a first conductive variable-length member VC1 and is positioned opposite the first conductive plate CP1 to form a first capacitance. Furthermore, the power transmission coupler 2 includes a second electrode EL2 and a second passive electrode Es2 which is electrically connected to the second electrode EL2 through a second conductive variable-length member VC2 and is positioned opposite the first conductive plate CP1 to form a second capacitance. Furthermore, the power transmission coupler 2 has a first adjustment mechanism AM1 which makes the distance d1 between the first passive electrode Es1 and the first conductive plate CP1 variable. The detailed configuration of the adjustment mechanism AM is explained in Figure 2. In Figure 1, some of its components may be indicated by reference numerals. In the first embodiment, the first adjustment mechanism AM1 is provided at the four corners of the first passive electrode Es1. In this embodiment, the unpowered electrode is synonymous with the auxiliary electrode.

[0022] Furthermore, the power transmission coupler 2 has a second adjustment mechanism AM2 that varies the distance d1 between the second unpowered electrode Es2 and the first conductive plate CP1. In the first embodiment, the second adjustment mechanism AM2 is provided at the four corners of the second unpowered electrode Es2. The configurations of the first adjustment mechanism AM1 and the second adjustment mechanism AM2 will be described later with reference to Figure 2. The configuration of the second adjustment mechanism AM2 is the same as that of the first adjustment mechanism AM1. The first adjustment mechanism AM1 and the second adjustment mechanism AM2 are appropriately insulated, and insulation is maintained between the first unpowered electrode Es1 and the first conductive plate CP1.

[0023] The power receiving coupler 3 has the same configuration as the power transmitting coupler 2. The power receiving coupler 3 may be symmetrical with respect to the power transmitting coupler 2 at the interface between the power transmitting coupler 2 and the power receiving coupler 3.

[0024] The power receiving coupler 3 has a grounded second conductive plate CP2. The power receiving coupler 3 has a third electrode EL3 and a third unpowered electrode Es3 which is electrically connected to the third electrode EL3 through a third conductive variable-length member VC3 and is positioned opposite the second conductive plate CP2 to form a third capacitance. Furthermore, the power receiving coupler 3 has a fourth electrode EL4 and a fourth unpowered electrode Es4 which is electrically connected to the fourth electrode EL4 through a fourth conductive variable-length member VC4 and is positioned opposite the second conductive plate CP2 to form a fourth capacitance. Furthermore, the power receiving coupler 3 has a third adjustment mechanism AM3 which varies the distance d1 between the third unpowered electrode Es3 and the second conductive plate CP2, and a fourth adjustment mechanism AM4 which varies the distance d1 between the fourth unpowered electrode Es4 and the second conductive plate CP2. The configuration of the third adjustment mechanism AM3 and the fourth adjustment mechanism AM4 is the same as that of the first adjustment mechanism AM1.

[0025] Figure 2 is a cross-sectional view (partially a side view) showing the configuration of the first adjustment mechanism AM1, in which the power transmission coupler 2 is cut in the negative Z direction along the I-I' cutting line in Figure 1, and the distance d1 between the first unpowered electrode Es1 and the first conductive plate CP1 is made variable. The components of the first adjustment mechanism AM1, namely the first nut Nt1, the first helical rod SR1, and the first engaging member EM1, may be appropriately insulated, and insulation is maintained between the first unpowered electrode Es1 and the first conductive plate CP1. The second adjustment mechanism AM2 to the fourth adjustment mechanism AM4 have a similar configuration.

[0026] The first helical rod SR1 is screwed into the first nut Nt1, which is fixed to the first conductive plate CP1. The first uncharged electrode Es1 has a through hole through which the first helical rod SR1 passes. The first engaging member EM1 is fixed to the first helical rod SR1. For example, the first engaging member EM1 is fixed to the tip of the first helical rod SR1 or near the first uncharged electrode Es1. In the example shown in Figure 2, the first engaging member EM1 is, for example, a disc-shaped plate material, and includes what is generally called a collar. The first helical rod SR1, the first nut Nt1, and the first engaging member EM1 may be insulating. For example, they may be made of resin.

[0027] The first helical rod SR1 is rotated left and right around its axis, changing the screwed state of the first helical rod SR1 with respect to the first nut Nt1. For example, when the first helical rod SR1 in Figure 2 is rotated clockwise when viewed from below in Figure 2, the first helical rod SR1 moves upward in Figure 2. The first engaging member EM1, fixed to the first helical rod SR1, contacts or engages with the first passive electrode Es1, thereby defining the position of the first passive electrode Es1. The first passive electrode Es1 receives force from the first conductive variable-length member VC1. In the example in Figure 2, the first conductive variable-length member VC1 is located near the center of the first passive electrode Es1 and acts by pressing the first passive electrode Es1 against the first engaging member EM1. The position of the first passive electrode Es1 is set by the first engaging member EM1. Incidentally, a capacitance is formed between the first passive electrode Es1 and the first conductive plate CP1. The capacitance is inversely proportional to the distance between the electrodes. The position of the first uncharged electrode Es1 is set by the first engaging member EM1, and the position of the first engaging member EM1 is continuously changed based on the rotation angle of the first helical rod SR1. Therefore, by continuously changing the rotation angle of the first helical rod SR1, the capacitance generated between the first uncharged electrode Es1 and the first conductive plate CP1 is continuously changed. In other words, a variable capacitance with continuously changeable capacitance is formed.

[0028] As shown in Figure 2, an insulating plate is provided between the first unpowered electrode Es1 and the first conductive plate CP1 as an insulating spacer IS. This ensures insulation between the first unpowered electrode Es1 and the first conductive plate CP1.

[0029] The distance d1 between the first unpowered electrode Es1 and the first conductive plate CP1 is described below. The shortest distance is defined by the thickness of the first insulating spacer IS1. The longest distance is defined by either the length of the first helical rod SR1 or the contraction limit of the first conductive variable-length member VC1. Even if there is sufficient length in the first helical rod SR1 and the first engaging member EM1 can be moved in the Z-axis direction in Figure 2, if the contraction limit of the first conductive variable-length member VC1 has been reached, the longest distance is defined by the contraction limit of the first conductive variable-length member VC1. Conversely, even if there is sufficient length up to the contraction limit of the first conductive variable-length member VC1, if there is a constraint on the length of the first helical rod SR1 and the first helical rod SR1 cannot rotate any further, the longest distance is defined by the length of the first helical rod SR1.

[0030] Figure 3 is a schematic diagram showing the equivalent circuit configuration of the field resonance type wireless power transmission coupler 1 described in Figures 1 and 2. In Figure 1, a configuration is shown with the power transmission coupler 2 at the bottom and the power reception coupler 3 at the top. In Figure 3, the power transmission coupler 2 is on the left and the power reception coupler 3 is on the right.

[0031] Power supply 4 provides power at a typical frequency, for example, 13.56 MHz. A first inductance L1 and a second inductance L2 are placed at the output of power supply 4 to form a resonant circuit. Power is then transmitted to the first electrode EL1 and the second electrode EL2. The first electrode EL1 is physically and electrically connected to the first unpowered electrode Es1 through the first conductive variable-length member VC1. The first unpowered electrode Es1 faces the first conductive plate CP1 and forms a capacitance. Similarly, the second electrode EL2 is physically and electrically connected to the second unpowered electrode Es2 through the second conductive variable-length member VC2. The second unpowered electrode Es2 faces the first conductive plate CP1 and forms a capacitance. The first conductive plate CP1 is grounded.

[0032] As described above, since the capacitance between the first unpowered electrode Es1 and the first conductive plate CP1 can be continuously changed, a diagonal arrow is added in Figure 3 to indicate that it is a variable capacitor. The relationship between the second unpowered electrode Es2 and the first conductive plate CP1 is similar.

[0033] The power receiving coupler 3 is connected to the load 5. The configuration of the power receiving coupler 3 may be symmetrical with that of the power transmitting coupler 2 at the interface between the power transmitting coupler 2 and the power receiving coupler 3. The third inductance L3 and the fourth inductance L4 are connected to form a resonant circuit.

[0034] In order to efficiently transmit the power supplied from power source 4 to load 5, it is necessary to match the resonant frequency to the frequency of the power from power source 4. In parallel with adjusting the first inductance L1 to the fourth inductance L4, in the field resonance type wireless power transmission coupler 1 according to the embodiment of the present invention, the capacitance generated between the first passive electrode Es1 and the first conductive plate CP1, the capacitance generated between the second passive electrode Es2 and the first conductive plate CP1, the capacitance generated between the third passive electrode Es3 and the second conductive plate CP2, and the capacitance generated between the fourth passive electrode Es4 and the second conductive plate CP2 are adjusted by the first adjustment mechanism AM1 to the fourth adjustment mechanism AM4 shown in Figure 2.

[0035] Figure 4 shows the relationship between the distance d1 (X-axis) between the first passive electrode Es1 and the first conductive plate CP1 and the capacitance value (Y-axis). This relationship is similar between the second passive electrode Es2 and the first conductive plate CP1, the third passive electrode Es3 and the second conductive plate CP3, and the fourth passive electrode Es4 and the second conductive plate CP2. As the distance d1 between the first passive electrode Es1 and the first conductive plate CP1 increases, the capacitance value decreases.

[0036] Figure 5 shows the relationship between the distance d1 (X-axis) between the first passive electrode Es1 and the first conductive plate CP1 and the resonant frequency (Y-axis). This relationship is similar between the second passive electrode Es2 and the first conductive plate CP1, the third passive electrode Es3 and the second conductive plate CP3, and the fourth passive electrode Es4 and the second conductive plate CP2. As the distance d1 between the first passive electrode Es1 and the first conductive plate CP1 increases, the resonant frequency increases.

[0037] High transmission efficiency is obtained when the resonant frequency in Figure 5 matches the frequency of the input power of power supply 4 shown in Figure 3. To obtain high transmission efficiency, the distance d1 between the first unpowered electrode Es1 and the first conductive plate CP1 is adjusted by the first adjustment mechanism AM1 shown in Figure 2. More specifically, the distance d1 is adjusted by tightening or loosening the first helical rod SR1 shown in Figure 2.

[0038] (Variation 1) In the first embodiment, the position of the first unpowered electrode Es1 is changed while maintaining a parallel relationship with the first conductive plate CP1. The first adjustment mechanisms AM1, which are provided near the four corners, are configured to operate simultaneously (see Figure 2). The same configuration is adopted for the second adjustment mechanisms AM2 to the fourth adjustment mechanisms AM4.

[0039] In Modification 1, in the four first adjustment mechanisms AM1 near the four corners, only one of the first adjustment mechanisms AM1 is operated, and as shown in Figure 6, the first unpowered electrode Es1 is oblique to the first conductive plate CP1. Here, for explanatory purposes, the first adjustment mechanisms AM1 are described using reference numerals such as one first adjustment mechanism AM11 and the other first adjustment mechanism AM12, one first helical rod SR11 and the other first helical rod SR12.

[0040] The state of the first helical rod SR11 of one of the first adjustment mechanisms AM11 is maintained. The first helical rod SR12 of the other first adjustment mechanism AM12 is rotated clockwise with respect to the Z axis in Figure 6 when viewed from below the plane of the paper. The other first helical rod SR12, which is screwed into the other nut Nt12 fixed to the first conductive plate CP1, moves in the Z axis direction, i.e., upward in the plane of the paper. Then, the other first engaging member EM12, which is fixed to the other first helical rod SR12, moves in the Z axis direction, i.e., upward in the plane of the paper. As a result, the other side of the first uncharged electrode Es1, which is locked to the other first engaging member EM1, is activated in the Z axis direction, i.e., upward in the plane of the paper, and the first uncharged electrode Es1 becomes oblique to the first conductive plate CP1.

[0041] As explained with reference to Figures 4 and 5, the resonance frequency is precisely adjusted by precisely adjusting the capacitance formed between the first uncharged electrode Es1 and the first conductive plate CP1. The capacitance depends on the distance between the electrodes. As shown in Figure 6, when only the other first adjustment mechanism AM12 is operated, a smaller change in capacitance is produced for the same amount of rotation or movement of the first helical rod SR1 compared to when all first adjustment mechanisms AM1 are operated. That is, the adjustment accuracy of the resonance frequency can be adjusted with higher precision.

[0042] In the first embodiment, a first conductive variable-length member VC1 is used. That is, the first electrode EL1 and the first passive electrode Es1 may be connected and electrically connected by a conductive variable-length member that generates tension by expanding and contracting from a predetermined length. An insulating elastic member and an electric wire may be provided separately. However, power is mainly transmitted as an electric field resonance type wireless power transmission coupler 1 via the first electrode EL1 and the second electrode EL2. For this reason, no large current flows between the first electrode EL1 and the first passive electrode Es1, or between the second electrode EL2 and the second passive electrode Es2. It is preferable that the first conductive variable-length member VC1 combines the functions of both an insulating elastic member and an electric wire.

[0043] (Second Embodiment) In the first embodiment, a first adjustment mechanism AM1 is provided near the four corners of the first passive electrode Es1 to adjust the distance d1 between the conductive plate CP and the passive electrode Es, but in the second embodiment, the first adjustment mechanism AM1 is provided near the center of the first passive electrode Es1. This will be explained with reference to Figures 7A and 7B. Figure 7B is a cross-sectional view (partially a side view) of the power transmission coupler 2 cut in the negative Z direction along the line II-II' in Figure 7A.

[0044] As shown in Figure 7A, a first conductive variable-length member VC1 is provided between the first electrode EL1 and the first passive electrode Es1, near the four corners of the first passive electrode Es1. The first conductive variable-length member VC1 provides electrical conductivity between the first electrode EL1 and the first passive electrode Es1. In Figure 7A, it is hidden by the first passive electrode Es1 and therefore not shown, but as shown in Figure 7B, a first adjustment mechanism AM1 is provided near the center or middle of the first passive electrode Es1. The configuration of the first adjustment mechanism AM1 is the same as the first adjustment mechanism AM1 shown in Figure 2 in the first embodiment. In the second embodiment, a first insulating spacer IS1 is provided on the first conductive plate CP1 at positions facing the four corners of the first passive electrode Es1.

[0045] The second electrode EL2, the third electrode EL3, and the fourth electrode EL4 also adopt the same configuration as the first electrode EL1, as shown in Figure 7B.

[0046] (Third embodiment) In the first and second embodiments, the first passive electrode Es1 to the fourth passive electrode Es4 each have their own independent adjustment mechanism AM1 to the fourth adjustment mechanism AM4. In the third embodiment, the positions of the first passive electrode Es1 and the second passive electrode Es2 are adjusted by a single first adjustment mechanism AM1, and the positions of the third passive electrode Es3 and the fourth passive electrode Es4 are adjusted by a single second adjustment mechanism AM2.

[0047] Figure 8A is a perspective view of the power transmission coupler 2 according to the third embodiment. Both the first unpowered electrode Es1 and the second unpowered electrode Es2 are fixed to the first insulating plate IP1. A first adjustment mechanism AM1 is provided between the first insulating plate IP1 and the first conductive plate CP1. The first adjustment mechanism AM1 is hidden by the first insulating plate IP1 and not visible in Figure 8A, but is provided near the center or near the middle of the first insulating plate IP1. Although not shown in Figure 8A, the power receiving coupler 3 may have the same configuration as the power transmission coupler 2. The power receiving coupler 3 may be arranged symmetrically with respect to the power transmission coupler 2 and the interface between the power transmission coupler 2 and the power receiving coupler 3.

[0048] The first adjustment mechanism AM1 will be described with reference to Figures 8A and 8B. Figure 8B is a cross-sectional view (partially a side view) of the power transmission coupler 2, cut in the negative Z direction along the line III-III' in Figure 8A. The first conductive variable-length members VC1 are provided at the four corners of the first unpowered electrode Es1. The first conductive variable-length members VC1 are, for example, metal helical springs. The first conductive variable-length members VC1 maintain the gap between the first electrode EL1 and the first unpowered electrode Es1, like a support. The first adjustment mechanism AM1 is installed near the center of the first insulating plate IP1.

[0049] As shown in Figure 8B, the first helical rod SR1 is screwed into the first nut Nt1 fixed to the first conductive plate CP1. Through holes are formed in the first uncharged electrode Es1 and the first insulating plate IP1, through which the first helical rod SR1 passes. The first engaging member EM1 is fixed to the first helical rod SR1. For example, the first engaging member EM1 is fixed at the tip of the first helical rod SR1 or near the first uncharged electrode Es1. The first helical rod SR1, the first nut Nt1, and the first engaging member EM1 may be insulating. For example, they may be made of resin.

[0050] The first helical rod SR1 is rotated left and right around its axis, changing the screwed state of the first helical rod SR1 with respect to the first nut Nt1. For example, when the first helical rod SR1 in Figure 8B is rotated clockwise when viewed from below in Figure 8B, the first helical rod SR1 moves upward in Figure 8B. The first engaging member EM1, fixed to the first helical rod SR1, contacts the first insulating plate IP1, defining the positions of the first insulating plate IP1 and the first passive electrode Es1. The first passive electrode Es1 receives force from the first conductive variable-length member VC1. In the example in Figure 8B, the first conductive variable-length member VC1 is provided at the four corners of the first passive electrode Es1 and acts by pressing the first passive electrode Es1 against the first engaging member EM1. The position of the first passive electrode Es1 is set by the first engaging member EM1. Incidentally, a capacitance is formed between the first passive electrode Es1 and the first conductive plate CP1. The capacitance is inversely proportional to the distance between the electrodes. The position of the first passive electrode Es1 is set by the first engaging member EM1, and the position of the first engaging member EM1 is set by continuously changing the rotation angle of the first helical rod SR1. Therefore, by continuously changing the rotation angle of the first helical rod SR1, the capacitance generated between the first passive electrode Es1 and the first conductive plate CP1 can be continuously changed. That is, a variable capacitance that can be continuously changed is formed. In the first embodiment, it was necessary to adjust the adjustment mechanism AM provided on the first passive electrode Es1 and the second passive electrode Es2 at eight locations. In contrast, in the third embodiment, the positions of the first passive electrode Es1 and the second passive electrode Es2 can be adjusted by adjusting only the first adjustment mechanism AM1 provided near the center of the first conductive plate CP1.

[0051] As shown in Figure 8B, an insulating plate IS is provided between the first passive electrode Es1 and the first conductive plate CP1 as an insulating spacer. This ensures insulation between the first passive electrode Es1 and the first conductive plate CP1. However, since the first insulating plate IP1 ensures insulation between the first passive electrode Es1 and the first conductive plate CP1, the insulating spacer IS does not need to be provided.

[0052] (Modification 2) In the above embodiment, in the first adjustment mechanism AM1, the first helical rod SR1 is screwed onto the first nut Nt1 fixed to the first conductive plate CP1. This corresponds to the first helical rod SR1 being screwed onto the first conductive plate CP1. As shown in Figure 9 as a modified example 3, the helical rod SR may also be screwed onto the first nut Nt1 fixed to the unpowered electrode Es. This corresponds to the first helical rod SR1 being screwed onto the first unpowered electrode Es1. The first helical rod SR1 rotates around its central axis and does not move in the Z-axis direction in Figure 9, and its distance from the first conductive plate CP1 remains constant. Furthermore, the first nut Nt1 and the first unpowered electrode Es1 to which the first nut Nt1 is fixed are restricted from rotating by components not shown in Figure 9. For example, although not shown in Figure 9, the rotation of the first unpowered electrode Es1 may be suppressed by the housing of the power transmission coupler 2. In this case, when the first helical rod SR1 rotates clockwise in the Z-axis direction, the first nut Nt moves in the negative Z-axis direction as shown in Figure 9. Then, the first passive electrode Es1 also moves in the negative Z-axis direction. As a result, the distance between the first passive electrode Es1 and the first conductive plate CP1 decreases, and the capacitance between the first passive electrode Es1 and the first conductive plate CP1 increases. A similar configuration may be applied to the second electrode EL2, the second passive electrode Es2, the first conductive plate CP1, the third electrode EL3, the third passive electrode Es3, the fourth electrode EL4, the fourth passive electrode Es4, and the second conductive plate CP2. That is, the first adjustment mechanism AM1 may have a first helical rod SR1 that is rotatable connecting the first passive electrode Es1 and the first conductive plate CP1 and that screws into the first passive electrode Es1; the second adjustment mechanism AM2 may have a second helical rod SR2 that is rotatable connecting the second passive electrode Es2 and the first conductive plate CP1 and that screws into the second passive electrode Es2; the third adjustment mechanism AM3 may have a third helical rod SR3 that is rotatable connecting the third passive electrode Es3 and the second conductive plate CP2 and that screws into the third passive electrode Es3; and the fourth adjustment mechanism AM4 may have a fourth helical rod SR4 that is rotatable connecting the fourth passive electrode Es4 and the second conductive plate CP2 and that screws into the fourth passive electrode Es4. In addition, the adjustment mechanism AM shown in Modification 2 may be applied instead of the adjustment mechanism AM in the first and second embodiments described above.

[0053] In this disclosure, the power transmission coupler 2 and the power reception coupler 3 are described as having a symmetrical configuration. However, the disclosure is not limited to this, and the power transmission coupler 2 and the power reception coupler 3 in the first embodiment, modified example 1, the second embodiment, the third embodiment, and modified example 2 may be combined with each other in any way.

[0054] This disclosure primarily describes an electric field resonance type wireless power transmission coupler 1 in which a power transmission coupler 2 and a power reception coupler 3 are arranged facing each other. The power transmission coupler 2 and the power reception coupler 3 may each be configured independently. The power transmission coupler 2 may be combined with a power reception coupler 3 of a configuration not disclosed in this disclosure to constitute the electric field resonance type wireless power transmission coupler 1. Similarly, the power reception coupler 3 may be combined with a power transmission coupler 2 of a configuration not disclosed in this disclosure to constitute the electric field resonance type wireless power transmission coupler 1.

[0055] This disclosure allows for various embodiments and modifications without departing from the broad spirit and scope of the present invention. Furthermore, the embodiments described above are for illustrative purposes only and do not limit the scope of the present invention. That is, the scope of the present invention is indicated by the claims, not by the embodiments. Various modifications made within the scope of the claims and the equivalent significance of the disclosure are considered to be within the scope of the present invention.

[0056] The following effects are achieved by the field resonance type wireless power transmission coupler 1 according to the embodiment described above.

[0057] (1) An electric field resonance type wireless power transmission coupler 1 that wirelessly transmits power from a power transmission coupler 2 to a power receiving coupler 3, wherein the power transmission coupler 2 has a first electrode EL1 and a second electrode EL2 arranged at a predetermined distance apart, and the power receiving coupler 3 has a third electrode EL3 and a fourth electrode EL4 arranged at a predetermined distance apart, the first electrode EL1 and the third electrode EL3 are arranged opposite each other, the second electrode EL2 and the fourth electrode EL4 are arranged opposite each other, and the power transmission coupler 2 has a grounded first conductive plate CP1, a first unpowered electrode Es1 which is electrically connected to the first electrode EL1 and is arranged opposite to the first conductive plate CP1 to form a first capacitance, and a second unpowered electrode Es2 which is electrically connected to the second electrode EL2 and is arranged opposite to the first conductive plate CP1 to form a second capacitance The power receiving coupler 3 includes a grounded second conductive plate CP2, a third passive electrode Es3 which is electrically connected to the third electrode EL3 and positioned opposite the second conductive plate CP2 to form a third capacitance, a fourth passive electrode Es4 which is electrically connected to the fourth electrode EL4 and positioned opposite the second conductive plate CP2 to form a fourth capacitance, a third adjustable mechanism AM3 which is electrically connected to the third passive electrode Es3 and positioned opposite the second conductive plate CP2 to form a fourth capacitance, and a fourth adjustable mechanism AM4 which is electrically connected to the fourth passive electrode Es4 and positioned opposite the second conductive plate CP2 to form a fourth capacitance.

[0058] This provides an electric field resonance type wireless power transmission coupler 1 in which the resonant frequency can be adjusted using a simple process.

[0059] (2) In the field resonance type wireless power transmission coupler 1 of (1), the first adjustment mechanism AM1 has a first helical rod SR1 that is rotatable connecting the first passive electrode Es1 and the first conductive plate CP1 and is screwed with the first conductive plate CP1, and a first engaging member EM1 that is fixed to the first helical rod SR1 and engages with the first passive electrode Es1, and the second adjustment mechanism AM2 has a second helical rod SR2 that is rotatable connecting the second passive electrode Es2 and the first conductive plate CP1 and is screwed with the first conductive plate CP1, and a second engaging member EM1 that is fixed to the second helical rod SR2 and engages with the second passive electrode Es2 The third adjustment mechanism AM3 has two engaging members EM2, and the third adjustment mechanism AM3 has a third helical rod SR3 that is rotatable connecting the third passive electrode Es3 and the second conductive plate CP2 and is screwed with the second conductive plate CP2, and a third engaging member EM3 that is fixed to the third helical rod SR3 and engages with the third passive electrode Es3, and the fourth adjustment mechanism AM4 may have a fourth helical rod SR4 that is rotatable connecting the fourth passive electrode Es4 and the second conductive plate CP2 and is screwed with the second conductive plate CP2, and a fourth engaging member EM4 that is fixed to the fourth helical rod SR4 and engages with the fourth passive electrode Es4.

[0060] This provides an electric field resonance type wireless power transmission coupler 1 in which the resonant frequency can be adjusted by a simple process of rotating the helical rod SR around its axis.

[0061] (3) In the field resonance type wireless power transmission coupler 1 of (2), the first helical rod SR1 to the fourth helical rod SR4 and the first engaging member EM1 to the fourth engaging member EM4 may be insulating.

[0062] This prevents a short circuit between the unpowered electrode Es and the conductive plate CP, ensuring reliable capacitance formation.

[0063] (4) In any of the field resonance type wireless power transmission couplers 1 described in (1) to (3), the first electrode EL1 and the first passive electrode Es1, the second electrode EL2 and the second passive electrode Es2, the third electrode EL3 and the third passive electrode Es3, and the fourth electrode EL4 and the fourth passive electrode Es4 may each be connected and electrically connected by a first conductive variable length member VC1 to a fourth conductive variable length member VC4, which generates tension when extended from a predetermined length.

[0064] This simultaneously satisfies both the objective of conducting electricity and the objective of maintaining a gap. A field resonance type wireless power transmission coupler 1 with a simpler configuration is provided.

[0065] In the field resonance type wireless power transmission coupler 1 of (5)(4), the first adjustment mechanism AM1 to the fourth adjustment mechanism AM4 may be provided near the four corners of the first passive electrode Es1 to the fourth passive electrode Es4, respectively, and the first conductive variable length member VC1 to the fourth conductive variable length member VC4 may be provided near the center of the first passive electrode Es1 to the fourth passive electrode Es4, respectively.

[0066] This allows for more precise control of the capacitance between the uncharged electrode Es and the conductive plate CP.

[0067] In the field resonance type wireless power transmission coupler 1 of (6)(4), the first adjustment mechanism AM1 to the fourth adjustment mechanism AM4 may be provided near the center of the first passive electrode Es1 to the fourth passive electrode Es4, respectively, and the first conductive variable length member VC1 to the fourth conductive variable length member VC4 may be provided near the four corners of the first passive electrode Es1 to the fourth passive electrode Es4, respectively.

[0068] This provides an electric field resonance type wireless power transmission coupler 1 with an even simpler configuration. The total number of adjustment mechanisms AM is four.

[0069] (7) In any of the field resonance type wireless power transmission couplers 1 described in (1) to (4), the first passive electrode Es1 and the second passive electrode Es2 are fixed on the first insulating plate IP1, and a single adjustment mechanism AM having the same configuration as the first adjustment mechanism AM1 or the second adjustment mechanism AM2 is provided in the center of the first insulating plate IP1, and the third passive electrode Es3 and the fourth passive electrode Es4 are fixed on the second insulating plate IP2, and a single adjustment mechanism AM having the same configuration as the third adjustment mechanism AM3 or the fourth adjustment mechanism AM4 may be provided near the center of the second insulating plate IP2.

[0070] This provides an electric field resonance type wireless power transmission coupler 1 with an even simpler configuration. The total number of adjustment mechanisms AM is two.

[0071] (8) In the field resonance type wireless power transmission coupler 1 of (1), the first adjustment mechanism AM1 has a first helical rod SR1 that is rotatable connecting the first passive electrode Es1 and the first conductive plate CP1 and that screws into the first passive electrode Es1; the second adjustment mechanism VA2 has a second helical rod SR2 that is rotatable connecting the second passive electrode Es2 and the first conductive plate CP1 and that screws into the second passive electrode Es2; the third adjustment mechanism AM3 has a third helical rod SR3 that is rotatable connecting the third passive electrode Es3 and the second conductive plate CP2 and that screws into the third passive electrode Es3; and the fourth adjustment mechanism VA4 may have a fourth helical rod SR4 that is rotatable connecting the fourth passive electrode Es4 and the second conductive plate CP2 and that screws into the fourth passive electrode Es4.

[0072] This allows the distance d1 between the uncharged electrode Es and the conductive plate CPn to be changed solely by rotation around the axis, without altering the center of gravity of the helical rod SR.

[0073] (9) The field resonance type wireless power transmission system comprises a field resonance type wireless power transmission coupler 1 of any of (1) to (8) and a power supply 4, and supplies power to a load 5.

[0074] This provides a highly efficient field resonance type wireless power transmission system in which the resonant frequency can be easily and precisely adjusted. (10) A power transmission coupler 2 or power receiving coupler 3 applicable to any of the field resonance type power transmission couplers 1 from (1) to (9).

[0075] This provides an electric field resonance type wireless power transmission coupler 1 in which the resonant frequency can be adjusted using a simple process. [Explanation of Symbols]

[0076] 1. Field resonance type wireless power coupler 2 Power transmission coupler 3. Power receiving coupler 4 Power supply 5 load ELn (where n is an integer greater than or equal to 1) nth electrode (where n is an integer greater than or equal to 1) CPn (where n is an integer greater than or equal to 1) nth conductive plate (where n is an integer greater than or equal to 1) VCn (where n is an integer greater than or equal to 1) nth conductive variable-length member (where n is an integer greater than or equal to 1) ISn (where n is an integer greater than or equal to 1): The nth insulating spacer (where n is an integer greater than or equal to 1) IPn (where n is an integer greater than or equal to 1): The nth insulating plate (where n is an integer greater than or equal to 1) Esn (where n is an integer greater than or equal to 1) The nth unpowered electrode (where n is an integer greater than or equal to 1) AMn (where n is an integer greater than or equal to 1) nth adjustment mechanism (where n is an integer greater than or equal to 1) SRn (where n is an integer greater than or equal to 1) The nth spiral rod (where n is an integer greater than or equal to 1) Ntn (where n is an integer greater than or equal to 1) The nth nut (where n is an integer greater than or equal to 1) EMn (where n is an integer greater than or equal to 1) nth engaging member (where n is an integer greater than or equal to 1) dn (where n is an integer greater than or equal to 1) is the distance between the nth uncharged electrode and the nth conductive plate (where n is an integer greater than or equal to 1).

Claims

1. A power transmission coupler that constitutes an electric field resonance type wireless power transmission coupler that wirelessly transmits power from a power transmission coupler to a power reception coupler, A first electrode and a second electrode are arranged at a predetermined distance apart, A grounded first conductive plate, A first unpowered electrode is electrically connected to the first electrode and is positioned opposite the first conductive plate to form a first capacitance, A second unpowered electrode is electrically connected to the second electrode and is positioned opposite the first conductive plate to form a second capacitance, A first adjustment mechanism for continuously varying the distance d1 between the first unpowered electrode and the first conductive plate, the first adjustment mechanism converts the rotational motion of a rotating member that engages with the first unpowered electrode and the first conductive plate into the relative displacement between the first unpowered electrode and the first conductive plate in the rotation axis direction of the rotating member, A second adjustment mechanism for continuously varying the distance d1 between the second unpowered electrode and the first conductive plate, the second adjustment mechanism converts the rotational motion of a rotating member that engages with the second unpowered electrode and the first conductive plate into the relative displacement between the second unpowered electrode and the first conductive plate in the rotation axis direction of the rotating member, Having, Power transmission coupler.

2. The first adjustment mechanism includes a first helical rod that is rotatable and screwed to the first conductive plate, connecting the first non-powered electrode and the first conductive plate, and a first engaging member that is fixed to the first helical rod and engages with the first non-powered electrode. The second adjustment mechanism includes a second helical rod that is rotatable connecting the second unpowered electrode and the first conductive plate and is screwed to the first conductive plate, and a second engaging member that is fixed to the second helical rod and engages with the second unpowered electrode. A power transmission coupler according to claim 1.

3. The first helical rod and the second helical rod and the first engaging member and the second engaging member are insulated. A power transmission coupler according to claim 2.

4. The first electrode and the first uncharged electrode, and the second electrode and the second uncharged electrode, are connected and electrically connected by a first conductive variable-length member and a second conductive variable-length member, respectively, which generate tension when extended from a predetermined length. A power transmission coupler according to any one of claims 1 to 3.

5. The first adjustment mechanism and the second adjustment mechanism are provided near the four corners of the first and second passive electrodes, respectively, and the first conductive variable length member and the second conductive variable length member are provided near the center of the first and second passive electrodes, respectively. A power transmission coupler according to claim 4.

6. The first adjustment mechanism and the second adjustment mechanism are each provided near the center of the first and second passive electrodes, and the first conductive variable length member and the second conductive variable length member are each provided near the four corners of the first and second passive electrodes. A power transmission coupler according to claim 4.

7. The first unpowered electrode and the second unpowered electrode are fixed on a first insulating plate, and a single adjustment mechanism having the same configuration as the first adjustment mechanism or the second adjustment mechanism is provided in the center of the first insulating plate. A power transmission coupler according to any one of claims 1 to 4.

8. The first adjustment mechanism has a first helical rod that is rotatable connecting the first unpowered electrode and the first conductive plate and that screws into the first unpowered electrode. The second adjustment mechanism has a second spiral rod that is rotatable connecting the second unpowered electrode and the first conductive plate, and that screws into the second unpowered electrode. A power transmission coupler according to claim 1.

9. An electric field resonance type wireless power transmission system comprising a power transmission coupler according to any one of claims 1 to 8 and a power supply, which supplies power to a load through a power receiving coupler.

10. A receiving coupler that constitutes an electric field resonance type wireless power transmission coupler for wirelessly transmitting power from a transmitting coupler to a receiving coupler, A first electrode and a second electrode are arranged at a predetermined distance apart, A grounded first conductive plate, A first unpowered electrode is electrically connected to the first electrode and is positioned opposite the first conductive plate to form a first capacitance, A second unpowered electrode is electrically connected to the second electrode and is positioned opposite the first conductive plate to form a second capacitance, A first adjustment mechanism for continuously varying the distance d1 between the first unpowered electrode and the first conductive plate, the first adjustment mechanism converts the rotational motion of a rotating member that engages with the first unpowered electrode and the first conductive plate into the relative displacement between the first unpowered electrode and the first conductive plate in the rotation axis direction of the rotating member, A second adjustment mechanism for continuously varying the distance d1 between the second unpowered electrode and the first conductive plate, the second adjustment mechanism converts the rotational motion of a rotating member that engages with the second unpowered electrode and the first conductive plate into the relative displacement between the second unpowered electrode and the first conductive plate in the rotation axis direction of the rotating member, Having, Power receiving coupler.

11. The first adjustment mechanism includes a first helical rod that is rotatable and screwed to the first conductive plate, connecting the first non-powered electrode and the first conductive plate, and a first engaging member that is fixed to the first helical rod and engages with the first non-powered electrode. The second adjustment mechanism includes a second helical rod that is rotatable connecting the second unpowered electrode and the first conductive plate and is screwed to the first conductive plate, and a second engaging member that is fixed to the second helical rod and engages with the second unpowered electrode. The power receiving coupler according to claim 10.

12. The first helical rod and the second helical rod and the first engaging member and the second engaging member are insulated. The power receiving coupler according to claim 11.

13. The first electrode and the first uncharged electrode, and the second electrode and the second uncharged electrode, are connected and electrically connected by a first conductive variable-length member and a second conductive variable-length member, respectively, which generate tension when extended from a predetermined length. A power receiving coupler according to any one of claims 10 to 12.

14. The first adjustment mechanism and the second adjustment mechanism are provided near the four corners of the first and second passive electrodes, respectively, and the first conductive variable length member and the second conductive variable length member are provided near the center of the first and second passive electrodes, respectively. A power receiving coupler according to claim 13.

15. The first adjustment mechanism and the second adjustment mechanism are each provided near the center of the first and second passive electrodes, and the first conductive variable length member and the second conductive variable length member are each provided near the four corners of the first and second passive electrodes. A power receiving coupler according to claim 13.

16. The first unpowered electrode and the second unpowered electrode are fixed on a first insulating plate, and a single adjustment mechanism having the same configuration as the first adjustment mechanism or the second adjustment mechanism is provided in the center of the first insulating plate. A power receiving coupler according to any one of claims 10 to 13.

17. The first adjustment mechanism has a first helical rod that is rotatable connecting the first unpowered electrode and the first conductive plate and that screws into the first unpowered electrode. The second adjustment mechanism has a second spiral rod that is rotatable connecting the second unpowered electrode and the first conductive plate, and that screws into the second unpowered electrode. The power receiving coupler according to claim 10.

18. An electric field resonance type wireless power transmission system comprising the power receiving coupler according to any one of claims 10 to 17 and a power transmitting coupler connected to a power source, wherein power is supplied to a load through the power receiving coupler.

19. An electric field resonance type wireless power transmission coupler that wirelessly transmits power from a power transmission coupler to a power reception coupler, The power transmission coupler has a first electrode and a second electrode arranged at a predetermined distance apart. The power receiving coupler has a third electrode and a fourth electrode arranged at a predetermined distance apart. The first electrode and the third electrode are arranged facing each other, and the second electrode and the fourth electrode are arranged facing each other. They are arranged, The aforementioned power transmission coupler is A grounded first conductive plate, A first unpowered electrode is electrically connected to the first electrode and is positioned opposite the first conductive plate to form a first capacitance, A second unpowered electrode is electrically connected to the second electrode and is positioned opposite the first conductive plate to form a second capacitance, A first adjustment mechanism for continuously varying the distance d1 between the first unpowered electrode and the first conductive plate, the first adjustment mechanism converts the rotational motion of a rotating member that engages with the first unpowered electrode and the first conductive plate into the relative displacement between the first unpowered electrode and the first conductive plate in the rotation axis direction of the rotating member, A second adjustment mechanism for continuously varying the distance d1 between the second unpowered electrode and the first conductive plate, the second adjustment mechanism converts the rotational motion of a rotating member that engages with the second unpowered electrode and the first conductive plate into the relative displacement between the second unpowered electrode and the first conductive plate in the rotation axis direction of the rotating member, It has, The aforementioned power receiving coupler is A grounded second conductive plate, A third unpowered electrode is electrically connected to the third electrode and positioned opposite the second conductive plate to form a third capacitance, A fourth unpowered electrode is electrically connected to the fourth electrode and is positioned opposite the second conductive plate to form a fourth capacitance, A third adjustment mechanism for continuously varying the distance d1 between the third unpowered electrode and the second conductive plate, the third adjustment mechanism converts the rotational motion of a rotating member that engages with the third unpowered electrode and the second conductive plate into the relative displacement between the third unpowered electrode and the second conductive plate in the rotation axis direction of the rotating member, A fourth adjustment mechanism for continuously varying the distance d1 between the fourth unpowered electrode and the second conductive plate, the fourth adjustment mechanism converts the rotational motion of a rotating member that engages with the fourth unpowered electrode and the second conductive plate into the relative displacement between the fourth unpowered electrode and the second conductive plate in the rotation axis direction of the rotating member, Having, Field resonance type wireless power coupler.

20. The first adjustment mechanism includes a first helical rod that is rotatable and screwed to the first conductive plate, connecting the first non-powered electrode and the first conductive plate, and a first engaging member that is fixed to the first helical rod and engages with the first non-powered electrode. The second adjustment mechanism includes a second helical rod that is rotatable connecting the second unpowered electrode and the first conductive plate and is screwed to the first conductive plate, and a second engaging member that is fixed to the second helical rod and engages with the second unpowered electrode. The third adjustment mechanism includes a third helical rod that is rotatable and screwed to the second conductive plate, connecting the third non-powered electrode and the second conductive plate, and a third engaging member that is fixed to the third helical rod and engages with the third non-powered electrode. The fourth adjustment mechanism includes a fourth helical rod that is rotatable and screwed to the second conductive plate, connecting the fourth non-powered electrode and the second conductive plate, and a fourth engaging member that is fixed to the fourth helical rod and engages with the fourth non-powered electrode. The field resonance type wireless power transmission coupler according to claim 19.

21. The first helical rod to the fourth helical rod and the first engaging member to the fourth engaging member are insulated. The field resonance type wireless power transmission coupler according to claim 20.

22. The first electrode and the first uncharged electrode, the second electrode and the second uncharged electrode, the third electrode and the third uncharged electrode, and the fourth electrode and the fourth uncharged electrode are each connected and electrically connected by a first conductive variable-length member that generates tension when extended from a predetermined length to a fourth conductive variable-length member. The field resonance type wireless power transmission coupler according to any one of claims 19 to 21.

23. The first to fourth adjustment mechanisms are provided near the four corners of the first to fourth passive electrodes, respectively, and the first to fourth conductive variable length members are provided near the center of the first to fourth passive electrodes, respectively. The field resonance type wireless power transmission coupler according to claim 22.

24. The first to fourth adjustment mechanisms are provided near the center of the first to fourth passive electrodes, respectively, and the first to fourth conductive variable length members are provided near the four corners of the first to fourth passive electrodes, respectively. The field resonance type wireless power transmission coupler according to claim 22.

25. The first unpowered electrode and the second unpowered electrode are fixed on a first insulating plate, and a single adjustment mechanism having the same configuration as the first adjustment mechanism or the second adjustment mechanism is provided in the center of the first insulating plate. The third unpowered electrode and the fourth unpowered electrode are fixed on a second insulating plate, and a single adjustment mechanism having the same configuration as the third adjustment mechanism or the fourth adjustment mechanism is provided near the center of the second insulating plate. The field resonance type wireless power transmission coupler according to any one of claims 19 to 22.

26. The first adjustment mechanism has a first helical rod that is rotatable connecting the first unpowered electrode and the first conductive plate and that screws into the first unpowered electrode. The second adjustment mechanism has a second spiral rod that is rotatable connecting the second unpowered electrode and the first conductive plate and that screws into the second unpowered electrode. The third adjustment mechanism has a third helical rod that is rotatable connecting the third unpowered electrode and the second conductive plate and that screws into the third unpowered electrode. The fourth adjustment mechanism has a fourth helical rod that is rotatable connecting the fourth unpowered electrode and the second conductive plate, and that screws into the fourth unpowered electrode. The field resonance type wireless power transmission coupler according to claim 19.

27. An electric field resonance type wireless power transmission system comprising an electric field resonance type wireless power transmission coupler according to any one of claims 19 to 26 and a power supply, for supplying power to a load.

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