Power transmission electrode for non-contact power feeding path

Abstract

To provide a power transmission electrode for a non-contact power feeding path in which an increase in dielectric loss tangent is suppressed.SOLUTION: A power transmission electrode for a non-contact power feeding path includes a plurality of first conductive parts 31, a first connection part 41 connected to adjacent first conductive parts 31, a plurality of second conductive parts 32, and a second connection part 42 connected to adjacent second conductive parts 32. The first connection part 41 includes a first metal part 51 connected to the first conductive parts, a first dielectric part 61 connected to the first metal part, a second metal part 52 that sandwiches the first dielectric part together with the first metal part, and a first adhesive part 71 attached to the adjacent first conductive part and the second metal part. The second connection part 42 includes a third metal part 53 connected to the second conductive parts, a second dielectric part 62 connected to the third metal part, a fourth metal part 54 that sandwiches the second dielectric part together with the third metal part, and a second adhesive part 72 attached to the adjacent second conductive part and the fourth metal part.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a power transmission electrode of a non-contact power supply path. [Background technology]

[0002] As described in Patent Document 1, a non-contact power supply line configured to be able to supply power to a mobile object that moves in a road space and has a power receiving circuit unit with a pair of electrodes has been known. This non-contact power supply line includes a pair of power transmission conductors and a connection circuit. The connection circuit is connected between the power transmission conductors and is, for example, a capacitor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-180597 Summary of the Invention [Problem to be solved by the invention]

[0004] Tape, which is relatively easy to obtain and install, is sometimes used as a capacitor in the connection circuit of the non-contact power supply path described in Patent Document 1. This tape may contain both a conductive adhesive and a non-conductive adhesive. Furthermore, the conductive adhesive contains a filler to provide conductivity, so the conductive adhesive has a relatively large dielectric dissipation factor. Furthermore, the non-conductive adhesive contains silicon, acrylic, or the like, which have a large dielectric dissipation factor, so the non-conductive adhesive also has a relatively large dielectric dissipation factor. Therefore, the tape used as a capacitor in the connection circuit has a large dielectric dissipation factor. If the tape used as a capacitor in the connection circuit has a large dielectric dissipation factor, the loss when supplying power to a moving object increases, resulting in reduced power supply efficiency.

[0005] An object of the present disclosure is to provide a power transmission electrode of a non-contact power supply line that suppresses an increase in the dielectric loss tangent. [Means for solving the problem]

[0006] The invention described in claim 1 is a power transmission electrode of a contactless power supply path that supplies power contactlessly from a power transmission power source (20) to a power receiving circuit (80) provided in a mobile body, and includes: a plurality of first conductive parts (31) arranged at intervals in one direction (DL); a first connection part (41) connected to adjacent first conductive parts; a plurality of second conductive parts (32) arranged at intervals from the first conductive parts in a direction perpendicular to the one direction and arranged at intervals in the one direction; and a second connection part (42) connected to adjacent second conductive parts; and the first connection part includes a first metal part (51) connected to the first conductive part; and a first dielectric part ( the second connection portion is a power transmission electrode of a non-contact type power supply line having a third metal portion (53) connected to the second conductive portion, a second dielectric portion (62) connected to the third metal portion and generating dielectric polarization when placed in an electric field, a fourth metal portion (54) sandwiching the second dielectric portion between itself and the third metal portion, a second conductive portion adjacent to the second conductive portion connected to the third metal portion, and a second adhesive portion (72) attached to the fourth metal portion and having conductivity.

[0007] The first dielectric portion is sandwiched between the first metal portion and the second metal portion. As a result, an electric field is applied only to the first dielectric portion located between the first metal portion and the second metal portion, and there is no component with a large dielectric dissipation factor between the first metal portion and the second metal portion. Furthermore, the second dielectric portion is sandwiched between the third metal portion and the fourth metal portion. As a result, an electric field is applied only to the second dielectric portion located between the third metal portion and the fourth metal portion, and there is no component with a large dielectric dissipation factor between the third metal portion and the fourth metal portion. Therefore, since there is no component with a large dielectric dissipation factor in the area where the electric field is applied, an increase in the dielectric dissipation factor in the power transmission electrode of the non-contact power supply line is suppressed.

[0008] The reference symbols in parentheses attached to each component indicate an example of the correspondence between the component and the specific components described in the embodiments described below. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view of an electric field coupling type non-contact power supply system in which a power transmission electrode of a non-contact power supply path according to an embodiment is used. [Figure 2] A diagram of the non-contact power supply line as seen from II in Figure 1. [Figure 3] 1 and 2 , a view of the non-contact power supply line from III. [Figure 4] Diagram of the contactless power supply line as seen from IV in Figs. 1 and 2 . [Figure 5] FIG. 3 is an enlarged cross-sectional view taken along line VV in FIGS. 1 and 2. [Figure 6] Cross-sectional view of the comparative tape. [Figure 7] 10 is a graph showing power supply efficiency versus distance from a power transmission power source when a power transmission electrode of a non-contact power supply path according to an embodiment is used. FIG. [Figure 8] FIG. 10 is a cross-sectional view of a power transmission electrode of a non-contact power supply path in a comparative example. [Figure 9] FIG. 10 is a diagram showing voltages at ends of first conductive parts facing each other in the longitudinal direction with respect to time. [Figure 10] FIG. 2 is a cross-sectional view of a power transmission electrode of a non-contact power supply path according to an embodiment. [Figure 11] 10 is a diagram showing power supply efficiency at a first connection portion when a power transmission electrode of a non-contact power supply path according to an embodiment is used. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments will be described with reference to the drawings. In the following embodiments, identical or equivalent parts will be denoted by the same reference numerals, and description thereof will be omitted.

[0011] In the power transmission electrode of the non-contact type power supply line of this embodiment, an increase in the dielectric loss tangent is suppressed. This power transmission electrode is used in an electric field coupling type non-contact type power supply system. First, the electric field coupling type non-contact type power supply system will be described.

[0012] As shown in FIGS. 1 to 4, the electric field coupling type contactless power supply system 10 includes a power transmission power source 20, a contactless power supply path 25, a power receiving circuit 80, and a battery 85.

[0013] The power transmitting power source 20 is a high frequency power source and supplies power at a frequency of, for example, 1 MHz to 10 GHz. The non-contact power supply line 25 has a power transmitting electrode 30 and supplies power in a non-contact manner from the power transmitting power source 20 to a power receiving circuit 80 (described later). The power transmitting electrode 30 will be described in detail later.

[0014] The power receiving circuit 80 is provided in a mobile object (not shown). The mobile object is, for example, a vehicle such as an AGV. AGV is an abbreviation for Automatic Guided Vehicle.

[0015] The power receiving circuit 80 also has a pair of power receiving electrodes 82 and a rectifier circuit (not shown). When power is supplied from the power transmitting power source 20 to the power receiving circuit 80, the power receiving electrodes 82 face the non-contact power feed path 25 due to the movement of the mobile object. At this time, a capacitor is formed between the power receiving electrodes 82 and the non-contact power feed path 25. Furthermore, when power is supplied from the power transmitting power source 20 to the non-contact power feed path 25, charge transfer occurs in the power receiving electrode 82, thereby supplying AC power to the rectifier circuit. The rectifier circuit converts the AC power from the power receiving electrodes 82 into DC power. The rectifier circuit also supplies the converted DC power to a battery 85. The battery 85 is charged with the DC power from the rectifier circuit. The battery 85 is also used to drive a motor, control circuit, etc. (not shown) of the mobile object.

[0016] As described above, the electric field coupling type contactless power supply system 10 is configured. Next, the power transmission electrode 30 of the contactless power supply path 25 will be described in detail.

[0017] Here, assume that non-contact power feed line 25 is composed only of a right-handed transmission line, and that the end of non-contact power feed line 25 opposite power transmitting power source 20 is an open end. In this case, since the end is open, the impedance of the end is infinite. Therefore, the voltage at the end is the highest. Furthermore, since the phase of the voltage applied to non-contact power feed line 25 lags with increasing distance from the end, the impedance of non-contact power feed line 25 decreases. Furthermore, at a point one-quarter of the wavelength of the power frequency of power transmitting power source 20 away from the end, the impedance of non-contact power feed line 25 becomes zero. Therefore, the voltage amplitude at this point becomes zero. Therefore, the electric field strength generated at this point also becomes zero, and the power feeding efficiency at this point also becomes zero. Note that the right-handed transmission line is, for example, a transmission line including a distributed constant circuit having elements having inductance connected in series and elements having capacitance connected between adjacent inductances.

[0018] For this reason, power transmitting electrode 30 of non-contact power supply line 25 is a composite right-handed / left-handed line in which a right-handed transmission line is divided into lengths sufficiently shorter than the wavelength related to the frequency of the power from power transmitting power source 20, and the divided right-handed transmission lines are connected by a left-handed circuit. The left-handed circuit is, for example, a C circuit.

[0019] Specifically, as shown in FIGS. 1 to 5, the power transmitting electrode 30 includes a first conductive portion 31, a first connecting portion 41, a second conductive portion 32, and a second connecting portion .

[0020] The first conductive portion 31 constitutes a right-handed transmission line. The first conductive portion 31 is conductive because it is made of a metal such as copper, aluminum, iron, or stainless steel. The first conductive portion 31 is formed in a flat plate shape and extends in the longitudinal direction DL of the first conductive portion 31. A plurality of first conductive portions 31 are arranged at intervals in the longitudinal direction DL of the first conductive portion 31. Hereinafter, the longitudinal direction DL of the first conductive portion 31 will be simply referred to as the longitudinal direction DL. The width direction DW of the first conductive portion 31 will be simply referred to as the width direction DW. The thickness direction DT of the first conductive portion 31 will be simply referred to as the thickness direction DT. The longitudinal direction DL corresponds to one direction. The width direction DW corresponds to a direction perpendicular to the one direction and corresponds to the direction in which the first conductive portion 31 and a second conductive portion 32 (described later) are arranged. The thickness direction DT corresponds to an orthogonal direction that is orthogonal to the direction in which the first conductive portions 31 and second conductive portions 32 (described later) are arranged.

[0021] Furthermore, when counting the first conductive parts 31 from the power transmission power source 20 side, the last first conductive part 31 has a first termination 311, which is the end opposite the power transmission power source 20, that is an open end. Furthermore, the length in the longitudinal direction DL of the first conductive part 31 is set sufficiently shorter than the wavelength related to the frequency of the power of the power transmission power source 20. This prevents the impedance drop in the first conductive part 31 from becoming zero. This prevents the occurrence of a point where the power supply efficiency becomes zero.

[0022] The first connection portion 41 forms a left-handed circuit. The first connection portion 41 is connected to the adjacent first conductive portions 31. Furthermore, the first connection portion 41 is a phase-advancing capacitor, and thus compensates for the phase delay from the first termination 311 in the voltage applied to the power transmitting electrode 30. This suppresses a decrease in impedance within the first conductive portion 31. Therefore, even if the power transmitting electrode 30 is lengthened in the longitudinal direction DL, the impedance is prevented from becoming zero.

[0023] Specifically, as shown in Fig. 5, the first connection portion 41 has a first metal portion 51, a first dielectric portion 61, a second metal portion 52, and a first adhesive portion 71. In Fig. 5, the first adhesive portion 71 is shown with a dot pattern to clearly indicate the location of the first adhesive portion 71.

[0024] The first metal portion 51 is made of a metal such as copper or aluminum, and is therefore conductive. The first metal portion 51 is formed in a plate or sheet shape. The first metal portion 51 is connected to the first conductive portion 31 in the thickness direction DT.

[0025] The first dielectric portion 61 is made of a fluororesin such as PTFE, and therefore generates dielectric polarization when placed in an electric field. Furthermore, the first dielectric portion 61 has a relatively small dielectric constant and dielectric loss tangent because it is made of a fluororesin such as PTFE. The first dielectric portion 61 is formed in a film shape. Furthermore, the first dielectric portion 61 is connected in the thickness direction DT to the side of the first metal portion 51 opposite to the first conductive portion 31 by thermocompression bonding, vapor deposition, or the like. PTFE is an abbreviation for Poly Tetra Fluoro Ethylene.

[0026] The second metal portion 52 is made of a metal such as copper or aluminum, and is therefore conductive. The second metal portion 52 is formed in a plate or sheet shape. The second metal portion 52 is connected to the side of the first dielectric portion 61 opposite to the first metal portion 51 in the thickness direction DT by thermocompression bonding, vapor deposition, or the like. Therefore, the second metal portion 52 and the first metal portion 51 sandwich the first dielectric portion 61 therebetween.

[0027] The first adhesive portion 71 is conductive due to the inclusion of a conductive filler such as a metal filler and a carbon filler, and is adhesive due to the inclusion of an adhesive such as silicone or acrylic. The first adhesive portion 71 is attached to the side of the second metal portion 52 opposite to the first dielectric portion 61 in the thickness direction DT. The first adhesive portion 71 is attached to the first conductive portion 31 adjacent to the first conductive portion 31 connected to the first metal portion 51. The first connecting portion 41 is tape-shaped and is wound before being attached to the first conductive portion 31. This makes the first connecting portion 41 easy to use and install.

[0028] Here, the area of ​​the surface of the first dielectric portion 61 facing the first metal portion 51 in the thickness direction DT and the area of ​​the surface of the first dielectric portion 61 facing the second metal portion 52 in the thickness direction DT are defined as Sd1. The area of ​​the surface of the first metal portion 51 facing the first dielectric portion 61 in the thickness direction DT is defined as Sm1. The area of ​​the surface of the second metal portion 52 facing the first dielectric portion 61 in the thickness direction DT is defined as Sm2.

[0029] Sd1 is greater than Sm1 and Sm2, that is, Sd1>Sm1, Sd1>Sm2.

[0030] 1 to 4, second conductive portion 32 constitutes a right-handed transmission line. Second conductive portion 32 is conductive because it is made of a metal such as copper, aluminum, iron, or stainless steel. Second conductive portion 32 is formed in a flat plate shape and extends in the longitudinal direction DL. A plurality of second conductive portions 32 are arranged at intervals in the longitudinal direction DL. Second conductive portions 32 are also arranged at intervals from first conductive portion 31 in the width direction DW.

[0031] Furthermore, the second termination 322, which is the end of the last second conductive part 32 when counting the second conductive parts 32 from the power transmission power source 20 side, opposite the power transmission power source 20, is an open end. Furthermore, the length in the longitudinal direction DL of the second conductive part 32 is set sufficiently shorter than the wavelength related to the frequency of the power of the power transmission power source 20. This prevents a decrease in impedance within the second conductive part 32. This prevents the occurrence of points where the power supply efficiency becomes zero.

[0032] The second connection portion 42 forms a left-handed circuit. The second connection portion 42 is connected to the adjacent second conductive portions 32. The second connection portion 42 is a phase-advancing capacitor, and compensates for the phase delay from the second termination 322 in the voltage applied to the power transmitting electrode 30. This suppresses a decrease in impedance within the second conductive portion 32. Therefore, even if the power transmitting electrode 30 is elongated in the longitudinal direction DL, the impedance is prevented from becoming zero. Therefore, since the power transmitting electrode 30 can be elongated, the length of the power transmitting electrode 30 in the longitudinal direction DL is set to, for example, 10 m or more.

[0033] Specifically, as shown in Fig. 5, the second connection portion 42 has a third metal portion 53, a second dielectric portion 62, a fourth metal portion 54, and a second adhesive portion 72. In Fig. 5, the second adhesive portion 72 is shown with a dot pattern to clearly indicate the location of the second adhesive portion 72.

[0034] The third metal portion 53 is made of a metal such as copper or aluminum, and is therefore conductive. The third metal portion 53 is formed in a plate or sheet shape. The third metal portion 53 is connected to the second conductive portion 32 in the thickness direction DT.

[0035] The second dielectric portion 62 is made of a fluororesin such as PTFE, and therefore generates dielectric polarization when placed in an electric field. Furthermore, because the second dielectric portion 62 is made of a fluororesin such as PTFE, the dielectric constant and dielectric loss tangent of the second dielectric portion 62 are relatively small. The second dielectric portion 62 is formed in a film shape. Furthermore, the second dielectric portion 62 is connected to the side of the third metal portion 53 opposite to the second conductive portion 32 in the thickness direction DT by thermocompression bonding, vapor deposition, or the like.

[0036] The fourth metal portion 54 is made of a metal such as copper or aluminum, and is therefore conductive. The fourth metal portion 54 is formed in a plate or sheet shape. The fourth metal portion 54 is connected to the side of the second dielectric portion 62 opposite to the third metal portion 53 in the thickness direction DT by thermocompression bonding, vapor deposition, or the like. Therefore, the fourth metal portion 54 and the third metal portion 53 sandwich the second dielectric portion 62 therebetween.

[0037] The second adhesive portion 72 is conductive due to the inclusion of a conductive filler such as a metal filler and a carbon filler, and is adhesive due to the inclusion of an adhesive such as silicone or acrylic. The second adhesive portion 72 is attached to the side of the third metal portion 53 opposite the second dielectric portion 62 in the thickness direction DT. The second adhesive portion 72 is attached to the second conductive portion 32 adjacent to the second conductive portion 32 connected to the third metal portion 53. The second connecting portion 42 is tape-shaped and is wound before being attached to the second conductive portion 32. This makes the second connecting portion 42 easy to use and install.

[0038] Here, the area of ​​the surface of the second dielectric portion 62 facing the third metal portion 53 in the thickness direction DT and the area of ​​the surface of the second dielectric portion 62 facing the fourth metal portion 54 in the thickness direction DT are defined as Sd2. The area of ​​the surface of the third metal portion 53 facing the second dielectric portion 62 in the thickness direction DT is defined as Sm3. The area of ​​the surface of the fourth metal portion 54 facing the second dielectric portion 62 in the thickness direction DT is defined as Sm4.

[0039] Sd2 is greater than Sm3 and Sm4, that is, Sd2>Sm3, Sd2>Sm4.

[0040] When power is supplied from the power transmitting power source 20 to the power receiving circuit 80, the first metal portion 51 and the third metal portion 53 face the power receiving electrode 82 in the thickness direction DT. When a current from the power transmitting power source 20 flows through the first connecting portion 41 via the first conductive portion 31, the first connecting portion 41 is connected to the first conductive portion 31 so that the current flows through the first metal portion 51, the first dielectric portion 61, the second metal portion 52, and the first adhesive portion 71 in that order. When a current from the power transmitting power source 20 flows through the second connecting portion 42 via the second conductive portion 32, the second connecting portion 42 is connected to the second conductive portion 32 so that the current flows through the third metal portion 53, the second dielectric portion 62, the fourth metal portion 54, and the second adhesive portion 72 in that order.

[0041] As described above, the power transmission electrode 30 of the non-contact power supply line 25 is configured. Next, how the power transmission electrode 30 of the non-contact power supply line 25 suppresses an increase in the dielectric loss tangent will be described.

[0042] Here, a comparative tape 90 as shown in Fig. 6 is sometimes used as a capacitor in the connection circuit of the non-contact power supply path described in Patent Document 1. The comparative tape 90 includes a comparative first metal portion 91, a conductive adhesive portion 92, a dielectric portion 93, a non-conductive adhesive portion 94, and a comparative second metal portion 95. In Fig. 6, the conductive adhesive portion 92 and the non-conductive adhesive portion 94 are shown with a dot pattern to clearly indicate their locations.

[0043] The comparative first metal portion 91 is conductive because it is made of copper, aluminum, or the like, and is connected to the power transmission conductor portion 96. The conductive adhesive portion 92 is conductive because it contains a conductive filler such as a metal filler, and is adhesive because it contains an adhesive such as silicone or acrylic. Furthermore, the conductive adhesive portion 92 is attached to the side of the comparative first metal portion 91 opposite the power transmission conductor portion 96. The dielectric portion 93 sandwiches the conductive adhesive portion 92 with the comparative first metal portion 91 and generates dielectric polarization when placed in an electric field. The non-conductive adhesive portion 94 sandwiches the dielectric portion 93 with the conductive adhesive portion 92 and is adhesive and non-conductive because it contains an adhesive such as silicone or acrylic. The comparative second metal portion 95 is conductive because it is made of copper, aluminum, or the like. In addition, the comparative second metal part 95 is connected to the side of the non-conductive adhesive part 94 opposite the dielectric part 93 and to the transmission conductor part 96 adjacent to the transmission conductor part 96 connected to the comparative first metal part 91.

[0044] Therefore, the conductive adhesive portion 92, the dielectric portion 93, and the non-conductive adhesive portion 94 are sandwiched between the comparative first metal portion 91 and the comparative second metal portion 95. As a result, an electric field is applied to the conductive adhesive portion 92, the dielectric portion 93, and the non-conductive adhesive portion 94, which are located between the comparative first metal portion 91 and the comparative second metal portion 95.

[0045] Furthermore, since the conductive adhesive portion 92 contains a filler to provide conductivity, the dielectric dissipation factor of the conductive adhesive portion 92 is relatively large. Furthermore, since the non-conductive adhesive portion 94 contains silicon, acrylic, or the like, which have large dielectric dissipation factors, the dielectric dissipation factor of the non-conductive adhesive portion 94 is relatively large. Therefore, the comparative tape 90 has a large dielectric dissipation factor in the range where an electric field is applied. If the comparative tape 90 has a large dielectric dissipation factor, the loss when supplying power to a moving object increases, and the power supply efficiency decreases.

[0046] 5, the power transmitting electrode 30 of the non-contact power supply path 25 of this embodiment includes a first connecting portion 41 and a second connecting portion 42. The first connecting portion 41 includes a first metal portion 51, a first dielectric portion 61, a second metal portion 52, and a first adhesive portion 71. The second connecting portion 42 includes a third metal portion 53, a second dielectric portion 62, a fourth metal portion 54, and a second adhesive portion 72.

[0047] Furthermore, the first dielectric portion 61 is sandwiched between the first metal portion 51 and the second metal portion 52. As a result, an electric field is applied only to the first dielectric portion 61 located between the first metal portion 51 and the second metal portion 52, and there is no member with a large dielectric dissipation factor between the first metal portion 51 and the second metal portion 52. Furthermore, the second dielectric portion 62 is sandwiched between the third metal portion 53 and the fourth metal portion 54. As a result, an electric field is applied only to the second dielectric portion 62 located between the third metal portion 53 and the fourth metal portion 54, and there is no member with a large dielectric dissipation factor between the third metal portion 53 and the fourth metal portion 54. Therefore, since there is no member with a large dielectric dissipation factor in the area where the electric field is applied, an increase in the dielectric dissipation factor in the power transmitting electrode 30 of the non-contact power supply path 25 is suppressed.

[0048] Since the increase in the dielectric loss tangent is suppressed, as shown in FIG. 7, the power supply efficiency when using the power transmission electrode 30 of the non-contact power supply path 25 of this embodiment is higher than that when using the comparative tape 90, at any distance from the power transmission power source 20.

[0049] Furthermore, the power transmission electrode 30 of the non-contact power supply path 25 of this embodiment also provides the following effects.

[0050] [1] As shown in FIG. 5, Sd1 is larger than Sm1 and Sm2, and Sd2 is larger than Sm3 and Sm4.

[0051] Since Sd1>Sm1 and Sd1>Sm2 are satisfied, the first metal portion 51 and the second metal portion 52 are less likely to be electrically connected. This prevents discharge, short circuits, and the like from occurring between the first metal portion 51 and the second metal portion 52. Furthermore, since Sd2>Sm3 and Sd2>Sm4 are satisfied, the third metal portion 53 and the fourth metal portion 54 are less likely to be electrically connected. This prevents discharge, short circuits, and the like from occurring between the third metal portion 53 and the fourth metal portion 54. These factors prevent the phase difference between the voltages applied to the first conductive portion 31 and the first connecting portion 41 and the voltages applied to the second conductive portion 32 and the second connecting portion 42 from deviating from a normal state, for example, 180°. This prevents a decrease in power supply efficiency.

[0052] [2] When power is supplied from the power transmitting power source 20 to the power receiving circuit 80, the first metal portion 51 and the third metal portion 53 face the power receiving electrode 82 in the thickness direction DT. The first connection portion 41 is connected to ends of the first conductive portion 31 that face each other in the longitudinal direction DL. The second connection portion 42 is connected to ends of the second conductive portion 32 that face each other in the longitudinal direction DL.

[0053] As shown in Fig. 8, as a comparative example, it is assumed that a current from the power transmission power source 20 flows in the following order: the first conductive portion 31, the first adhesive portion 71, the second metal portion 52, the first dielectric portion 61, and the first metal portion 51. Also, as shown in Fig. 9, among the ends of the first conductive portion 31 facing each other in the longitudinal direction DL, the voltage amplitude of the end on the power transmission power source 20 side is greater than the voltage amplitude of the end on the opposite side from the power transmission power source 20. Note that in Fig. 9, among the ends of the first conductive portion 31 facing each other in the longitudinal direction DL, the voltage of the end on the power transmission power source 20 side is indicated by Ve1 and a solid line. Among the ends of the first conductive portion 31 facing each other in the longitudinal direction DL, the voltage of the end on the opposite side from the power transmission power source 20 is indicated by Ve2 and a dashed line.

[0054] For this reason, the electric field strength applied to the end of the first conductive part 31 facing each other in the longitudinal direction DL on the side of the power transmission power source 20 is greater than the electric field strength applied to the end opposite the power transmission power source 20. As a result, the electric field strength of the first metal part 51 located on the opposite side of the first adhesive part 71 connected to the end of the first conductive part 31 with a large voltage amplitude becomes relatively small. Therefore, the electric field strength between the first metal part 51 and the power receiving electrode 82 becomes small, and the power supply efficiency of the first connection part 41 decreases.

[0055] Furthermore, suppose that the second connecting portion 42 is connected to the second conductive portion 32 so that when a current from the power transmission power source 20 flows through the second connecting portion 42 via the second conductive portion 32, the current flows in the order of the second adhesive portion 72, the fourth metal portion 54, the second dielectric portion 62, and the third metal portion 53. In this case, the power supply efficiency at the second connecting portion 42 decreases, as in the case described above.

[0056] In contrast, in this embodiment, as shown in Figure 10, when current from the transmission power source 20 flows through the first connection portion 41 via the first conductive portion 31, it flows in the order of the first metal portion 51, the first dielectric portion 61, the second metal portion 52 and the first adhesive portion 71.

[0057] As a result, the electric field strength of the first metal portion 51 located on the opposite side of the first adhesive portion 71 connected to the end of the first conductive portion 31, where the electric field strength is small, is greater than in the comparative example. Therefore, the electric field strength between the first metal portion 51 and the power receiving electrode 82 is greater, and as a result, the power supply efficiency of the first connecting portion 41 is greater than in the comparative example, as shown in Fig. 11. In Fig. 11, the positional range of the first connecting portion 41 is indicated as Pr.

[0058] Furthermore, when current from the power transmission power source 20 flows through the second connection portion 42 via the second conductive portion 32, it flows through the third metal portion 53, the second dielectric portion 62, the fourth metal portion 54 and the second adhesive portion 72 in that order.

[0059] As a result, similarly to the above, the electric field strength increases between the third metal portion 53 and the power receiving electrode 82. Therefore, the power supply efficiency in the second connection portion 42 increases compared to the comparative example.

[0060] (Other embodiments) The present disclosure is not limited to the above-described embodiments, and appropriate modifications can be made to the above-described embodiments. Furthermore, it goes without saying that the elements constituting the embodiments in the above-described embodiments are not necessarily essential unless they are specifically stated as essential or are considered to be clearly essential in principle.

[0061] In the above embodiment, the first dielectric portion 61 and the second dielectric portion 62 are made of a fluororesin such as PTFE, thereby serving as a dielectric. However, the first dielectric portion 61 and the second dielectric portion 62 are not limited to being made of a fluororesin, and may be made of a resin with a relatively small dielectric constant and dielectric loss tangent, such as polyethylene or polypropylene, thereby serving as a dielectric.

[0062] In the above embodiment, Sd1>Sm1, Sd1>Sm2, Sd2>Sm3, and Sd2>Sm4 are satisfied. However, Sd1=Sm1=Sm2 may also be satisfied. Also, Sd2=Sm3=Sm4 may also be satisfied. [Explanation of symbols]

[0063] 20 Power Source 31, 32 First conductive part, second conductive part 41, 42 First connection part, second connection part 51, 52 1st metal part, 2nd metal part 53, 54 3rd metal part, 4th metal part 61, 62 First dielectric part, second dielectric part 71, 72 1st adhesive part, 2nd adhesive part 80 Receiving circuit

Claims

1. A power transmission electrode of a non-contact power supply path that supplies power from a power transmission power source (20) to a power receiving circuit (80) provided in a mobile object in a non-contact manner, A plurality of first conductive parts (31) arranged at intervals in one direction (DL), a first connection portion (41) connected to adjacent first conductive portions; a plurality of second conductive portions (32) arranged at intervals from the first conductive portion in a direction perpendicular to the one direction and arranged at intervals in the one direction; a second connection portion (42) connected to the second conductive portions adjacent to each other; Equipped with The first connection portion is a first metal portion (51) connected to the first conductive portion; a first dielectric part (61) connected to the first metal part and generating dielectric polarization when placed in an electric field; a second metal portion (52) sandwiching the first dielectric portion between the first metal portion and the second metal portion; a first adhesive portion (71) that is attached to the first conductive portion adjacent to the first conductive portion connected to the first metal portion and to the second metal portion and has conductivity; and The second connection portion is a third metal portion (53) connected to the second conductive portion; a second dielectric portion (62) connected to the third metal portion and generating dielectric polarization when placed in an electric field; a fourth metal portion (54) sandwiching the second dielectric portion with the third metal portion; a second adhesive portion (72) that is attached to the second conductive portion adjacent to the second conductive portion connected to the third metal portion and to the fourth metal portion and has conductivity; A power transmission electrode of a non-contact power supply line.

2. When the direction (DW) in which the first conductive portion and the second conductive portion are arranged and the direction orthogonal to the one direction are defined as an orthogonal direction (DT), an area (Sd1) of a surface of the first dielectric portion facing the first metal portion in the orthogonal direction and an area (Sd1) of a surface of the first dielectric portion corresponding to the second metal portion in the orthogonal direction are larger than an area (Sm1) of a surface of the first metal portion facing the first dielectric portion in the orthogonal direction and an area (Sm2) of a surface of the first metal portion facing the second dielectric portion in the orthogonal direction, 2. The power transmission electrode of claim 1, wherein an area (Sd2) of the surface of the second dielectric portion facing the third metal portion in the perpendicular direction and an area (Sd2) of the surface of the second dielectric portion corresponding to the fourth metal portion in the perpendicular direction are larger than an area (Sm3) of the surface of the third metal portion facing the second dielectric portion in the perpendicular direction and an area (Sm4) of the surface of the fourth metal portion facing the second dielectric portion in the perpendicular direction.

3. the first metal portion and the third metal portion face a power receiving electrode (82) connected to the power receiving circuit when power is supplied from the power transmitting power source to the power receiving circuit; the first connection portions are connected to ends of the first conductive portions that face each other in the one direction, the second connection portions are connected to ends of the second conductive portions that face each other in the one direction, The current from the transmission power source is When the current flows through the first connection portion via the first conductive portion, the current flows in the order of the first metal portion, the first dielectric portion, the second metal portion, and the first adhesive portion, The power transmission electrode of a non-contact power supply path according to claim 1 or 2, wherein when current flows through the second connection portion via the second conductive portion, it flows in the order of the third metal portion, the second dielectric portion, the fourth metal portion, and the second adhesive portion.

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