Non-contact power transmission device and non-contact power transmission system

Abstract

To stably supply power.SOLUTION: A non-contact power transmission device is formed so that a connection member 23 (members 23-1, 23-2) is constituted so that a conductor path L for connecting both conductor patterns 22p, 22p with each other is formed by connecting a connector 23b1 in one of coil formation units 20, 20 adjacent in a circumferential direction of a power transmission coil with a connector 23b2 in the other coil formation unit 20 to mutually connect conductor patterns 22p, 22p of both coil formation unit 20, 20, and that distance between the conductor pattern 22p in one of the adjacent coil formation units 20, 20 and a center part at a part P2 of the conductor path L becomes longer than distance between the conductor pattern 22p and a center part at a part P4, and distance between the conductor pattern 22p in the other coil formation unit 20 and a center part at a part P7 of the conductor path L becomes longer than distance between the conductor pattern 22p and a center part at a part P5.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present invention relates to a contactless power transmission device having a power transmission coil formed by connecting a plurality of coil-forming units, and a contactless power transfer system including such a contactless power transmission device. [Background technology]

[0002] As a contactless power transmission system equipped with this type of contactless power transmission device, the following Patent Document discloses a rail-type contactless power transmission system (hereinafter simply referred to as a "power transmission system") capable of contactlessly supplying power (contactless power transmission) to a mobile object. This power transmission system is configured, for example, to be able to supply power to a mobile object such as a transport vehicle or a door that moves along a rail guided by a rail installed on a floor or ceiling. Specifically, this power transmission system includes a power transmission circuit (power transmission coil) that includes a power transmission power source disposed at one end of the rail, a coil member (rail-type contactless power transmission module: hereinafter simply referred to as a "power transmission module") disposed along the extension direction of the rail, and a short circuit disposed at the other end of the rail, and a power receiving coil (power receiving circuit) that is attached to the mobile object and receives power transmitted from the power transmission circuit and transmits it to the mobile object.

[0003] In this case, the power transmission module includes coil members for both travels and capacitors connected in series to both coil members. In this power transmission system, multiple power transmission modules are connected along the direction in which the rail extends, and a single loop of power transmission coil is formed by the coil members and short circuits in each power transmission module. In this power transmission system, a power receiving coil is attached to the mobile object and disposed within the power transmission coil, and the power receiving coil moves together with the mobile object relative to the power transmission coil (rail). This makes it possible for the power transmission system to transmit (supply) power via the power receiving coil to a mobile object moving along the direction in which the rail extends (i.e., the direction in which the power transmission circuit extends). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-187060 A (pages 4-8, figures 1-6) Summary of the Invention [Problem to be solved by the invention]

[0005] However, the power transfer system (contactless power transfer system) and its power transfer coil (power transfer circuit: contactless power transfer device) disclosed in the above patent document have the following problems that need to be solved.

[0006] Specifically, the power transmission system is configured to include a plurality of power transmission modules each having a coil member made of a conductive pattern (conductor pattern) on a substrate, and to form a contactless power transmission device (power transmission coil) by arranging the power transmission modules side by side within a range in which a moving object to be supplied with power should move and connecting the coil members. In this case, in the contactless power transmission device of this power transmission system, the coil members of adjacent power transmission modules are connected by a connection part made of a hook terminal, general-purpose wiring, conductive tape, or the like, and a short circuit is connected to the coil member of the power transmission module arranged at the end, thereby forming a single loop of a power transmission coil.

[0007] On the other hand, in this type of power transfer system, to efficiently transfer power from a contactless power transmitter to a contactless power receiver, it is necessary to specify the position and orientation of the power receiver coil relative to the power transmitter coil, taking into account the direction of the magnetic field (magnetic flux) generated around the power transmitter coil during transmission. In this case, in the above-mentioned contactless power transmitter in which the power transmitter coil is formed by connecting conductor patterns (coil members) on the substrate of each power transfer module via a connection part, depending on the type of connection part used, the direction of the current flowing in the conductor pattern (extension direction of the conductor pattern) and the direction of the current flowing in the connection part (extension direction of the terminals, wiring, and conductor patterns that make up the connection part) may not be the same, which may result in a state in which the direction of the magnetic field (magnetic flux) generated by the current flowing in the conductor pattern differs from the direction of the magnetic field (magnetic flux) generated by the current flowing in the connection part.

[0008] In this configuration, when the power receiving coil is moved along the rail together with the moving object (target of power supply), the degree of magnetic field coupling in the power receiving coil differs when the power receiving coil is located in the center of the conductor pattern in the longitudinal direction (away from the connection portion) and when the power receiving coil is located near the connection portion (at the end of the conductor pattern), resulting in a different induced electromotive force in the power receiving coil. As a result, the power transmission efficiency changes depending on the position of the moving object (i.e., the position of the power receiving coil relative to the power transmitting coil), making it difficult to stably supply power to the moving object (target of power supply). Therefore, a solution to this problem is needed.

[0009] The present invention has been made to solve the above-mentioned problems, and its main object is to provide a contactless power transmission device and a contactless power transfer system that can stably supply power to a supply target regardless of the position of the power receiving coil relative to the power transmitting coil. [Means for solving the problem]

[0010] a first member having a first cable whose base end is connected to one end of the conductor pattern in the longitudinal direction and a first connector connected to a tip end of the first cable, and a second member having a second cable whose base end is connected to the other end of the conductor pattern in the longitudinal direction and a second connector connected to the tip end of the second cable, and a second member having a second cable whose base end is connected to the other end of the conductor pattern in the longitudinal direction and a second connector connected to the tip end of the second cable, and a first connector of one of the coil-forming units adjacent to each other in the circumferential direction and a first connector of the other of the coil-forming units adjacent to each other in the circumferential direction and a first connector of the other of the coil-forming units, When the conductor pattern in one coil-forming unit and the conductor pattern in the other coil-forming unit are connected to each other by connecting the second connector, a conductor path constituted by the first member in the one coil-forming unit and the second member in the other coil-forming unit has the following portions located along the substrate surface of the coil substrate in the one coil-forming unit: a first portion between the base end of the first cable and a tip end portion part separated from the base end in a direction away from the conductor pattern of the coil substrate; a second portion between the tip end portion of the first portion and a tip end portion part separated from the tip end portion in a direction approaching the other end of the conductor pattern; a third portion between the tip end portion of the second portion and a tip end portion part separated from the tip end portion in the direction approaching the conductor pattern; and a fourth portion between the tip end portion of the third portion and a tip end portion part separated from the tip end portion in a direction approaching the one end of the conductor pattern.a fifth portion between the tip portion side portion of the fourth portion and a tip portion side portion spaced apart from the tip portion side portion in a direction approaching one end of the conductor pattern; a sixth portion between the tip portion side portion of the fifth portion and a tip portion side portion spaced apart from the tip portion side portion in a direction away from the conductor pattern; and a seventh portion between the tip portion side portion of the sixth portion and a tip portion side portion spaced apart from the tip portion side portion in a direction approaching the other end of the conductor pattern; and an eighth section between the tip end side section of the seventh section and the base end section of the second cable that is spaced away from the tip end side section in a direction approaching the conductor pattern, and is formed so that the distance between the conductor pattern in one of the coil-forming units and a central section in the second section is longer than the distance between the conductor pattern and the central section in the fourth section, and the distance between the conductor pattern in the other of the coil-forming units and the central section in the seventh section is longer than the distance between the conductor pattern and the central section in the fifth section.

[0011] A contactless power transfer system according to the present invention includes the contactless power transmitting device described above and a contactless power receiving device having a power receiving coil.

[0012] Therefore, in the contactless power transmitting device and contactless power transfer system according to the present invention, in the conductor path formed by the connecting members (first and second members) connecting the conductor patterns of two adjacent coil-forming units, the fourth and fifth portions, where a magnetic field is generated in the same direction as the magnetic field generated around the conductor patterns, are located closer to the conductor patterns than the second and seventh portions, where a magnetic field is generated in the opposite direction to the magnetic field generated around the conductor patterns, so that an electromotive force of the same magnitude as that generated by coupling with the magnetic field generated around the conductor patterns can be generated in the power receiving coil even between adjacent conductor patterns. As a result, power can be transmitted from the contactless power transmitting device to the contactless power receiving device with the same transmission efficiency regardless of the position of the power receiving coil relative to the power transmitting coil, thereby achieving a stable power supply to the power supply target. Furthermore, by configuring the connecting members (first member and second member) with the flexible first and second cables, the conductor patterns of two adjacent coil-forming units can be connected after the coil-forming units are fixed to the installation target, which significantly improves the degree of freedom in the installation order of the coil-forming units. Also, the work of connecting adjacent conductor patterns (the work of connecting the first connector and the second connector) can be easily performed.

[0013] In addition, in the contactless power transmission device according to the present invention, the coil forming unit is configured to include a plurality of the coil substrates arranged along the circumferential direction and fixed to a single base, and the conductor patterns of adjacent coil substrates are connected to each other by the connecting member. Therefore, in the contactless power transmission device according to the present invention and a contactless power transfer system including such a contactless power transmission device, multiple coil substrates can be simultaneously positioned relative to the installation target simply by fixing a single base to the installation target. This reduces the number of times the coil forming unit needs to be attached to the installation target compared to a configuration including a coil forming unit in which one coil substrate is attached to a single base, thereby making it possible to easily install the contactless power transmission device in a short time.

[0014] Furthermore, in the contactless power transmission device according to the present invention, the coil forming unit includes a plurality of the coil substrates that are fixed to the single base and arranged facing each other so that the substrate surfaces are parallel. Therefore, in the contactless power transmission device according to the present invention and a contactless power transfer system including such a contactless power transmission device, by fixing the base on which the two coil substrates that are arranged facing each other to an installation target, two locations of the power transmission coil can be simultaneously positioned by the conductor patterns on both coil substrates. This reduces the number of times the coil forming unit needs to be attached to the installation target, allowing the contactless power transmission device to be easily installed in a short amount of time. [Effects of the Invention]

[0015] According to the contactless power transmission device and contactless power transfer system of the present invention, in the conductor path formed by the connecting members (first member and second member) that connect the conductor patterns of adjacent coil-forming units, the connecting members are configured so that the fourth and fifth portions, in which a magnetic field is generated in the same direction as the magnetic field generated around the conductor pattern, are positioned closer to the conductor pattern than the second and seventh portions, in which a magnetic field is generated in the opposite direction to the magnetic field generated around the conductor pattern.This makes it possible to suitably couple the magnetic field generated around the conductor path (fourth member and fifth member) to the receiving coil, which is configured to be able to suitably couple with the magnetic field generated around the conductor pattern, and therefore makes it possible to stably supply power to the supply target regardless of the position of the receiving coil relative to the transmitting coil. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a diagram showing the configuration of a contactless power transfer system 1. FIG. [Figure 2] 1 is a cross-sectional view of a contactless power transmitting device 2 (coil forming unit 20) and a contactless power receiving device 3 in a contactless power transfer system 1. FIG. [Figure 3]1 is a perspective view showing the appearance of a coil forming unit 20 (a contactless power transmitting device 2) and a contactless power receiving device 3 in a contactless power transfer system 1. FIG. [Figure 4] FIG. 2 is a perspective view of the appearance of a coil forming unit 20 (non-contact power transmitting device 2). [Figure 5] 2 is an explanatory diagram for explaining the configuration of a coil substrate 22 and connecting members 23 (members 23-1 and 23-2) in the coil forming unit 20. FIG. [Figure 6] 2 is a perspective view of the appearance of the coil substrate 22 and the connecting members 23 (members 23-1 and 23-2) in the coil substrate 22. FIG. [Figure 7] 10 is another external perspective view of the coil substrate 22 and the connecting members 23 (members 23-1 and 23-2) in the coil substrate 22. FIG. [Figure 8] 10 is an explanatory diagram for explaining the connection mode of conductor patterns 22p, 22p in the terminal coil forming unit 20. FIG. [Figure 9] 10 is an explanatory diagram for explaining the relationship between the direction of a current flowing through a conductor pattern 22p and a connecting member 23 and the direction of a generated magnetic field (magnetic flux). FIG. [Figure 10] FIG. 10 is another explanatory diagram for explaining the relationship between the direction of the current flowing through the conductor pattern 22p and the connecting member 23 and the direction of the generated magnetic field (magnetic flux). DETAILED DESCRIPTION OF THE INVENTION

[0017] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a contactless power transmitting device and a contactless power transfer system according to the present invention will be described with reference to the accompanying drawings.

[0018] 1 to 3 is an example of a "contactless power transfer system," and is configured to be able to supply power to a supply target X2, which is a moving body, in the same way as the power transfer systems disclosed in the aforementioned patent documents. Note that the basic principle of power transmission from a power transmission circuit to a power receiving circuit (contactless power supply: contactless power transfer) is the same as that of the aforementioned power transfer system, and therefore a detailed description thereof will be omitted.

[0019] 1, the contactless power transmission system 1 includes a power supply unit PW, a contactless power transmitting device 2 (coil forming units 20, 20...), a contactless power receiving device 3, and a connection unit 10. The power supply unit PW is connected via the connection unit 10 to one end coil forming unit 20 of a plurality of coil forming units 20, 20 that are connected along the extension direction of a rail (not shown) that guides a moving body, as will be described later, and supplies a high-frequency alternating current with a transmission frequency of approximately 0.5 MHz to 40 MHz (for example, 6.78 MHz) to the contactless power transmitting device 2.

[0020] The contactless power transmission device 2 is an example of a "contactless power transmission device" and is configured by connecting a plurality of coil forming units 20, 20.... In this case, the coil forming unit 20 is an example of a "coil forming unit," and includes a base 21, coil substrates 22, 22... (coil substrates 22a to 22f), and connecting members 23, 23..., as shown in Figures 2 to 4. The base 21 is an example of a "base," and is formed with a U-shaped cross section from a metal plate such as stainless steel or aluminum, to which the coil substrates 22, 22... and connecting members 23, 23... that constitute part of the "power transmission coil" are fixed, and which can be screwed to an installation target X1 (such as a ceiling, beam, wall, or floor).

[0021] 5 to 7, a linear conductor pattern 22p (an example of a "conductor pattern") constituting a portion of the "power transmission coil" in the circumferential direction is formed on one surface of a substrate body 22b. The coil substrate 22 is dustproof and waterproof, and the entire substrate body 22b is covered with an insulating resin mold 22m to prevent damage due to contact with the non-contact power receiving device 3 or the like. In this case, in the non-contact power transmitting device 2 (coil forming unit 20) of this example, six coil substrates 22, i.e., coil substrates 22a to 22f, are fixed to one base 21 by screws, for example.

[0022] 4, the contactless power transmission device 2 (coil forming unit 20) of this example includes coil substrates 22a to 22c and coil substrates 22d to 22f that are linearly arranged along the circumferential direction (the direction of arrow C) of a "power transmission coil" formed by connecting the coil forming units 20 and fixed to the base 21. In this case, in the coil forming unit 20 of this example, the coil substrates 22a and 22f, the coil substrates 22b and 22e, and the coil substrates 22c and 22d correspond to "the plurality of coil substrates that are arranged opposite each other with their substrate surfaces parallel and fixed to one base," and the substrate surfaces of the coil substrates 22a to 22c (the surface of the substrate main body 22b on which the conductor pattern 22p is formed) and the substrate surfaces of the coil substrates 22d to 22f are arranged parallel to each other.

[0023] 4, 8 to 10, the connecting member 23 is configured to be able to interconnect the conductor patterns 22p, 22p of the two coil substrates 22, 22. As shown in FIGS. 6 and 7, the connecting member 23 includes a cable 23a1 (an example of a "first cable") connected to one end of the coil substrate 22p, a connector 23b1 (a waterproof connector: an example of a "first connector") connected to the end of the cable 23a1 opposite to the conductor pattern 22p, a cable 23a2 (an example of a "second cable") connected to the other end of the coil substrate 22p, and a connector 23b2 (a waterproof connector: an example of a "second connector") connected to the end of the cable 23a2 opposite to the conductor pattern 22p. In the connection member 23 of this example, the cable 23a1 and the connector 23b1 constitute member 23-1, which is an example of a "first member," and the cable 23a2 and the connector 23b2 constitute member 23-2, which is an example of a "second member."

[0024] Furthermore, in the connection member 23 of this example, as shown in Figures 9 and 10, when the connector 23b1 of one of the coil forming units 20, 20 adjacent in the circumferential direction of the "power transmission coil" (for example, the left coil forming unit 20 in both figures) is connected to the connector 23b2 of the other of the adjacent coil forming units 20, 20 (for example, the right coil forming unit 20 in both figures), thereby interconnecting the conductor pattern 22p of one coil forming unit 20 and the conductor pattern 22p of the other coil forming unit 20, a conductor path L (an example of a "conductor path") is formed by the member 23-1 of one coil forming unit 20 and the member 23-2 of the other coil forming unit 20, which interconnects the conductor patterns 22p, 22p of both coil forming units 20, 20.

[0025] In addition, in the conductor path L formed by the connection members 23 (members 23-1, 23-2) of the non-contact power transmission device 2 (coil forming unit 20) in this example, the portions P1, P2, P3, and P4 located along the substrate surface of the coil substrate 22 in one of the coil forming units 20 (the coil forming unit 20 on the left in both figures) correspond to the "first portion," the "second portion," the "third portion," and the "fourth portion," respectively.

[0026] In this case, portion P1 is a portion between the base end portion of cable 23a1 (the end portion connected to conductor pattern 22p on the left coil substrate 22: end portion Pa in FIG. 9) and a tip end portion (end portion Pb shown in FIG. 9) that is spaced apart from the base end portion (end portion Pa) along a direction (downward in both figures) away from conductor pattern 22p on the left coil substrate 22. Furthermore, portion P2 is a portion between the tip end portion (end portion Pb) of portion P1 and a tip end portion (end portion Pc shown in FIG. 9) that is spaced apart from the tip end portion (end portion Pb) along a direction (leftward in both figures) approaching the other end portion of conductor pattern 22p on the left coil substrate 22.

[0027] Furthermore, portion P3 is a portion between the tip end portion (end Pc) of portion P2 and a tip end portion (end Pd shown in FIG. 9) that is spaced apart from the tip end portion (end Pc) in a direction (upward in both figures) approaching the conductor pattern 22p on the left coil substrate 22. Furthermore, portion P4 is a portion between the tip end portion (end Pd) of portion P3 and a tip end portion (end Pe shown in FIG. 9) that is spaced apart from the tip end portion (end Pd) in a direction (rightward in both figures) approaching one end of the conductor pattern 22p on the left coil substrate 22.

[0028] Furthermore, in this conductor path L, the portions P5, P6, P7, and P8 located along the substrate surface of the coil substrate 22 in the other coil forming unit 20 (the coil forming unit 20 on the right in both figures) correspond to the "5th portion," "6th portion," "7th portion," and "8th portion," respectively.

[0029] In this case, the portion P5 is a portion between the tip end portion (end portion Pe) of the portion P4 and a tip end portion (end portion Pf shown in FIG. 9) that is spaced apart from the tip end portion (end portion Pe) in a direction (rightward in both figures) approaching one end of the conductor pattern 22p on the right coil substrate 22. The portion P6 is a portion between the tip end portion (end portion Pf) of the portion P5 and a tip end portion (end portion Pg shown in FIG. 9) that is spaced apart from the tip end portion (end portion Pf) in a direction (downward in both figures) away from the conductor pattern 22p on the right coil substrate 22.

[0030] Furthermore, portion P7 is a portion between the tip end portion (end portion Pg) of portion P6 and a tip end portion (end portion Ph shown in FIG. 9) that is spaced apart from the tip end portion (end portion Pg) in a direction (leftward in both figures) approaching the other end of the conductor pattern 22p on the right coil substrate 22. Furthermore, portion P8 is a portion between the tip end portion (end portion Ph) of portion P7 and a base end portion (the end portion connected to the conductor pattern 22p on the right coil substrate 22: end portion Pi in FIG. 9) of the cable 23a2 that is spaced apart from the tip end portion (end portion Ph) in a direction (upward in both figures) approaching the conductor pattern 22p on the right coil substrate 22.

[0031] In the coil forming unit 20 of this example, the conductor patterns 22p, 22p of the coil substrates 22 of adjacent coil forming units 20, 20 fixed to the base 21 are connected to each other by a conductor path L formed by connecting members 23 (members 23-1, 23-2). Furthermore, as shown in Fig. 1, in the contactless power transfer system 1 of this example, the multiple coil forming units 20, 20... are lined up along rails (not shown) laid within the movement range of the supply target X2 and are each fixed to the installation target X1, and the conductor patterns 22p, 22p of the coil substrates 22 of adjacent coil forming units 20, 20 are connected to each other by the conductor path L formed by the connecting members 23 (members 23-1, 23-2).

[0032] 8, in the coil forming unit 20 located on the opposite side to the side to which the power supply unit PW is connected, the connector 23b1 on the connecting member 23 (member 23-1) of the coil substrate 22c and the connector 23b2 on the connecting member 23 (member 23-2) of the coil substrate 22d are connected, and the conductor pattern 22p on the coil substrate 22c and the conductor pattern 22p on the coil substrate 22d are connected in series. As a result, in the contactless power transfer system 1 of this example, the connection unit 10 and each of the coil forming units 20, 20... (the conductor pattern 22p of each coil substrate 22 and each connecting member 23) form one loop of a power transmission coil.

[0033] The non-contact power receiving device 3 is an example of a "non-contact power receiving device," and as shown in Figures 2 and 3, includes a base 31, support members 32, 32..., a power receiving coil 33, a core 34, a cover 35, an O-ring 36, and fastening members 37, 37... (screws 37a and nuts 37b), as well as a rectifier circuit (not shown) that rectifies the output to the supply target X2.

[0034] Base 31 is formed in the shape of a long plate from a metal such as stainless steel or aluminum. Support member 32 supports core 34 while spaced apart from base 31, and is formed from an insulating resin material such as polycarbonate so as to be able to support power receiving coil 33 while spaced apart from core 34. Note that instead of a configuration including support member 32, a member that supports core 34 while spaced apart from base 31 and a member that supports power receiving coil 33 while spaced apart from core 34 may be separately disposed (not shown).

[0035] The power receiving coil 33 is an example of a "power receiving coil," and as shown in Fig. 2, is composed of a conductor 33a wound around the support members 32, 32... so as to be suspended between the support members 32, 32... through which the core 34 is inserted. While the figure shows a four-loop power receiving coil 33 in which the conductor 33a is wound four times, the "power receiving coil" can be configured with one loop, or multiple windings such as two, three, five, or more loops, depending on the power receiving characteristics required of the "contactless power receiving device." The core 34 is formed in a long rectangular parallelepiped shape and is supported by the support members 32, 32... so as to function as the magnetic core of the power receiving coil 33.

[0036] The cover 35 is made of an insulating resin material such as polycarbonate and is formed in the shape of a container having an opening on one side that covers the support members 32, the power receiving coil 33, and the core 34, and is fixed to the base 31 by fastening members 37, 37.... In this case, in the contactless power receiving device 3 of this example, as shown in Fig. 2, the cover 35 is made sufficiently small so that the power receiving coil 33 covered by the cover 35 can be brought sufficiently close to the power transmitting coil (such as the conductor pattern 22p of the coil substrate 22 in the coil forming unit 20 of the contactless power transmitting device 2). Also, in the contactless power receiving device 3 of this example, the support member 32 contacts the inner surface of the cover 35, thereby preventing the power receiving coil 33 and the core 34 supported by the support member 32 from moving (shifting) within the cover 35.

[0037] The O-ring 36 is sandwiched between the base 31 and the cover 35, and prevents foreign matter (dust, moisture, etc.) from entering the space housing the power receiving coil 33 and the core 34 from between the base 31 and the cover 35. The fastening member 37 includes a screw 37a and a nut 37b, and fixes the cover 35 to the base 31 as described above.

[0038] When this contactless power transmission system 1 supplies power to a supply target X2, as shown in Figure 1, multiple coil forming units 20, 20... are lined up along the extension direction of a rail that guides the movement of the supply target X2 (for example, the direction of arrow C) and fixed to the installation target X1. It should be noted that, prior to fixing each coil forming unit 20 to the installation target X1, the conductor pattern 22p of the coil substrate 22a and the conductor pattern 22p of the coil substrate 22b are connected to each other via a conductor path L formed by the connecting member 23, the conductor pattern 22p of the coil substrate 22b and the conductor pattern 22p of the coil substrate 22c are connected to each other via a conductor path L formed by the connecting member 23, the conductor pattern 22p of the coil substrate 22d and the conductor pattern 22p of the coil substrate 22e are connected to each other via a conductor path L formed by the connecting member 23, and the conductor pattern 22p of the coil substrate 22e and the conductor pattern 22p of the coil substrate 22f are connected to each other via a conductor path L formed by the connecting member 23.

[0039] Next, for each of the coil forming units 20, 20... fixed to the installation target X1, the conductor pattern 22p of the coil substrate 22c of one of the adjacent coil forming units 20, 20 and the conductor pattern 22p of the coil substrate 22a of the other coil forming unit 20 are connected to each other via the conductor path L formed by the connecting member 23, and the conductor pattern 22p of the coil substrate 22d of one of the adjacent coil forming units 20, 20 and the conductor pattern 22p of the coil substrate 22f of the other coil forming unit 20 are connected to each other via the conductor path L formed by the connecting member 23. This results in the conductor patterns 22p, 22p... of the adjacent coil forming units 20, 20 being connected in series.

[0040] In this case, instead of the components 23-1, 23-2 in the coil forming unit 20 of this example, a board-mounted connector is mounted on the forming surface of the conductor pattern 22p on the coil substrate 22, and this connector is used as a "connecting component" to connect the conductor patterns 22p, 22p of adjacent coil substrates 22, 22, and the conductor patterns 22p, 22p... of each coil substrate 22, 22 can also function as part of the "power transmission coil" in the circumferential direction.

[0041] However, in a "coil formation unit" employing such a configuration, the connector and the coil substrate 22 fixed to the base 21 are integrated, making it impossible to change the position or orientation of the connector relative to the coil substrate 22. Therefore, each "coil formation unit" must be fixed to the installation target X1 while connecting the connectors of adjacent "coil formation units" (inserting one connector into the other). Therefore, when installing multiple "coil formation units," the installation must be performed in order, starting with the "coil formation unit" located on the power supply PW side or the opposite side, reducing the flexibility of the installation order. Furthermore, even if a malfunction is found in a "coil formation unit" located in the middle of the arrangement of multiple "coil formation units" that have already been fixed, it is difficult to remove and replace just that "coil formation unit." Furthermore, when using a board-mounted connector to construct a "connection member," although waterproofing of the joint (terminal) can be ensured by using a waterproof connector, it is difficult to ensure waterproofing between the coil substrate 22 and the connector.

[0042] Furthermore, even in a configuration in which the conductor patterns 22p, 22p of adjacent coil substrates 22, 22 are directly connected by a cable as a "connecting member" instead of the members 23-1, 23-2 in the coil forming unit 20 of this example, the conductor patterns 22p, 22p of each coil substrate 22, 22 can function as part of the "power transmission coil" in the circumferential direction. However, in a "coil forming unit" employing such a configuration, it is necessary to solder or screw both ends of the cable to the conductor pattern 22p of the coil substrate 22, making installation extremely cumbersome.

[0043] In contrast, in the coil forming unit 20 (contactless power transmitting device 2) of this example, the member 23-1 is provided with the cable 23a1 and the connector 23b1, and the member 23-2 is provided with the cable 23a2 and the connector 23b2. In this case, in the connecting member 23 (members 23-1, 23-2) in the coil forming unit 20 of this example, the cables 23a1, 23a2 connected to the conductor pattern 22p are flexible, and the positions of the connectors 23b1, 23b2 relative to the coil substrate 22 can be arbitrarily changed during the connection work. Therefore, the connectors 23b1, 23b2 can be connected to the coil substrate 22 of the coil forming unit 20 in a state where the fixing to the installation object X1 has been completed by changing the positions of the connectors 23b1, 23b2. Therefore, after fixing each coil forming unit 20 to the installation object X1 in any order, the conductor patterns 22p, 22p of adjacent coil forming units 20, 20 can be connected by the connecting members 23 (members 23-1, 23-2), thereby improving the freedom of the order of installation work.

[0044] Furthermore, simply by connecting the connectors 23b1 and 23b2 connected to the cables 23a1 and 23a2, the conductor pattern 22p connected to the cable 23a1 and the conductor pattern 22p connected to the cable 23a2 can be connected. Therefore, each coil forming unit 20 can be easily installed in a short time without performing complicated tasks such as soldering or screwing the cables. Furthermore, as described above, waterproof connectors are used as the connectors 23b1 and 23b2, and the connection portions between the coil substrate 22 and the cable 23a1, the connection portions between the cable 23a1 and the connector 23b1, the connection portions between the coil substrate 22 and the cable 23a2, and the connection portions between the cable 23a2 and the connector 23b1 are sealed with a resin mold, thereby ensuring the required dustproofness and waterproofness.

[0045] Next, the power supply PW is connected to one end (the left end in the example of FIG. 1) of each coil forming unit 20 via the connection part 10. As shown in FIG. 8, the conductor patterns 22p, 22p of the coil substrates 22c, 22d are connected by connecting the member 23-1 (connector 23b1) connected to the conductor pattern 22p of the coil substrate 22c of the coil forming unit 20 at the other end (the right end in the example of FIG. 1) with the member 23-2 (connector 23b2) connected to the conductor pattern 22p of the coil substrate 22d. This allows the ends of the power transmission coils opposite to the power supply PW to be easily connected without the need for a separate member corresponding to the short circuit in the power transmission system disclosed in the aforementioned patent document. As a result, one loop of the power transmission coil is formed, and the wireless power transmission device 2 is completed.

[0046] Next, the supply target X2 with the non-contact power receiving device 3 attached thereto is attached to the rail. At this time, as shown in Figures 2 and 3, the power receiving coil 33 of the non-contact power receiving device 3 is inserted into the power transmitting coil formed by the conductor pattern 22p etc. As a result, the non-contact power transmission system 1 is ready to supply power.

[0047] On the other hand, when AC current is supplied from the power supply unit PW to the non-contact power transmitter 2 (power transmission coil), non-contact power transmission is started from the non-contact power transmitter 2 (power transmission coil) to the non-contact power receiver 3 (power reception coil 33), and the power received by the non-contact power receiver 3 is supplied to the supply target X2. As a result, power is supplied to a motor for moving the supply target X2, various electric motors connected to the supply target X2, and the like.

[0048] In this case, in the contactless power transmission device 2 in the contactless power transfer system 1 of the present example, the conductor patterns 22p, 22p of the coil substrates 22a, 22b, the substrate main bodies 22b, 22c, the coil substrates 22d, 22e, and the coil substrates 22e, 22f, which are fixed to the base 21 in each coil forming unit 20, are connected to each other by a conductor path L formed by the connecting members 23 (members 23-1, 23-2). In this conductor path L, as shown in Figures 9 and 10, the distance between the conductor pattern 22p on one coil substrate 22 and the center portion of the aforementioned position P2 is longer than the distance between the conductor pattern 22p and the center portion of the aforementioned position P4, and the distance between the conductor pattern 22p on the other coil substrate 22 and the center portion of the aforementioned position P7 is longer than the distance between the conductor pattern 22p and the center portion of the aforementioned position P5.

[0049] Furthermore, in the contactless power transmission device 2 in the contactless power transfer system 1 of this example, the conductor patterns 22p of the coil substrates 22c, 22a and the coil substrates 22d, 22f of the adjacent coil forming units 20, 20 are connected to each other by a conductor path L formed by the connecting members 23 (members 23-1, 23-2). In this conductor path L, as shown in Figures 9 and 10, the distance between the conductor pattern 22p of one coil substrate 22 and the center portion of the aforementioned position P2 is longer than the distance between the conductor pattern 22p and the center portion of the aforementioned position P4, and the distance between the conductor pattern 22p of the other coil substrate 22 and the center portion of the aforementioned position P7 is longer than the distance between the conductor pattern 22p and the center portion of the aforementioned position P5.

[0050] In this case, in the contactless power transmission device 2 of this example, a portion of the power transmission coil in the circumferential direction is configured by the conductor pattern 22p formed on the coil substrate 22, and the circumferentially adjacent conductor patterns 22p, 22p are connected by the connecting members 23 (members 23-1, 23-2), when a voltage is applied from the power supply unit PW to both ends of the power transmission coil to supply power to the supply target X2, the current flowing through the power transmission coil flows through the conductor path L configured by the connecting members 23 between the adjacent conductor patterns 22p, 22p. In this case, in order to easily connect the connectors 23b1, 23b2 (waterproof connectors) on the adjacent coil substrates 22, 22 when attaching each coil substrate 22 to the base 21 or when connecting each coil forming unit 20, the cables 23a1, 23a2 need to have a sufficient extra length (a length that is sufficiently longer than the distance between the ends of the conductor patterns 22p, 22p on the adjacent coil substrates 22, 22).

[0051] For this reason, it is not possible to provide a conductor path L including the long cables 23a1, 23a2 between the conductor patterns 22p, 22p without deviating from the extending direction of the conductor patterns 22p, 22p. Specifically, in the contactless power transmitting device 2 (coil forming unit 20) of this example, the cables 23a1, 23a2 are provided with sufficient extra length in consideration of workability (ease of connecting the connectors 23b1, 23b2) during assembly and installation of the coil forming unit 20, so that the conductor path L deviates from the extending direction of the conductor patterns 22p, 22p between the conductor patterns 22p, 22p on adjacent coil substrates 22, 22, as shown in FIGS.

[0052] Here, depending on how the conductor path L deviates from the conductor patterns 22p, 22p (the direction of deviation or the distance of deviation), the direction of the magnetic field generated by the current flowing through the conductor pattern 22p may differ from the direction of the magnetic field generated by the current flowing through the conductor path L, or it may become difficult to suitably couple the magnetic field generated by the current flowing through the conductor path L to the power receiving coil 33, which may result in a decrease in the efficiency of power transmission from the contactless power transmitting device 2 to the contactless power receiving device 3. Therefore, in the contactless power transmitting device 2 (coil forming unit 20) of this example, the connecting members 23 (members 23-1 and 23-2) are configured so that the portion of the conductor path L where the current flows in the same direction as the current flowing through the conductor pattern 22p is located near the conductor patterns 22p, 22p, and the portion of the conductor path L where the current flows in a direction different from the current flowing through the conductor pattern 22p can be sufficiently separated from the conductor patterns 22p, 22p.

[0053] Specifically, as shown in Fig. 10, when a voltage is applied across the power transmission coil by the power supply unit PW and a current flows in the direction of arrow APa through one of the conductor patterns 22p, 22p on adjacent coil substrates 22, 22 (for example, the conductor pattern 22p on the left coil substrate 22), a current flows in the direction of arrow APb through the other conductor pattern 22p connected via the conductor path L. The directions of these arrows APa, APb are the same, ie, along the circumferential direction of the power transmission coil (the direction of arrow C in Figs. 1 and 3). As a result, the direction of the magnetic field generated around one conductor pattern 22p (arrow BPa) and the direction of the magnetic field generated around the other conductor pattern 22p (arrow BPb) are the same.

[0054] In the conductor path L, a current flows through portion P1 in the direction of arrow A1, a current flows through portion P2 in the direction of arrow A2, a current flows through portion P3 in the direction of arrow A3, a current flows through portion P4 in the direction of arrow A4, a current flows through portion P5 in the direction of arrow A5, a current flows through portion P6 in the direction of arrow A6, a current flows through portion P7 in the direction of arrow A7, and a current flows through portion P8 in the direction of arrow A8. Here, the direction of the current flowing through portions P4 and P5 (the direction of arrows A4 and A5) is the same as the direction of the current flowing through conductor patterns 22p (the direction of arrows APa and APb). Therefore, the direction of the magnetic field generated around portions P4 and P5 (the direction of arrows B4 and B5) is the same as the direction of the magnetic field generated around conductor patterns 22p (the direction of arrows BPa and BPb).

[0055] On the other hand, the direction of current flowing through portions P2 and P7 (the direction of arrows A2 and A7) is opposite (almost opposite) to the direction of current flowing through conductive patterns 22p (the direction of arrows APa and APb). Therefore, the direction of magnetic fields generated around portions P2 and P7 (the direction of arrows B2 and B7) is opposite to the direction of magnetic fields generated around conductive patterns 22p (the direction of arrows BPa and BPb). Furthermore, the direction of current flowing through portions P1 and P6 (the direction of arrows A1 and A6) and the direction of current flowing through portions P3 and P8 (the direction of arrows A3 and A8) intersect with the direction of current flowing through conductive patterns 22p (the direction of arrows APa and APb). Therefore, the direction of the magnetic field generated around these portions P1 and P6 (the direction of arrows B1 and B6) and the direction of the magnetic field generated around these portions P3 and P8 (the direction of arrows B3 and B8) are in a direction that intersects with the direction of the magnetic field generated around the conductor patterns 22p and 22p (the direction of arrows BPa and BPb).

[0056] In this case, in the contactless power transmission device 2 (coil forming unit 20) in the contactless power transmission system 1 of this example, as described above, the distance between the conductor pattern 22p on one of the adjacent coil substrates 22, 22 and the central portion at position P2 is longer than the distance between that conductor pattern 22p and the central portion at position P4, and the distance between the conductor pattern 22p on the other coil substrate 22 and the central portion at position P7 is longer than the distance between that conductor pattern 22p and the central portion at position P5. In other words, in the conductor path L in the contactless power transmission device 2 of this example, between the conductor patterns 22p, 22p of adjacent coil substrates 22, 22, the portions P4, P5 where a magnetic field is generated in the same direction as the magnetic field generated around the conductor pattern 22p are located near the conductor patterns 22p, 22p, while the portions P2, P7 where a magnetic field is generated in the opposite direction to the magnetic field generated around the conductor pattern 22p are located away from the conductor patterns 22p, 22p, and the portions P1, P3, P6, P8 where a magnetic field is generated in a direction intersecting the magnetic field generated around the conductor pattern 22p are located away from the positions between the adjacent conductor patterns 22p, 22p (positions where the conductor pattern 22p is not present).

[0057] As a result, in the contactless power transmitter 2 (coil forming unit 20) in the contactless power transfer system 1 of this example, the arrangement and shape of the power receiving coil 33 of the contactless power receiver 3 are specified so as to enable favorable coupling with the magnetic field generated around the conductor pattern 22p on the coil substrate 22 of each coil forming unit 20, so that the magnetic field generated around the portions P4 and P5 can be favorably coupled to the power receiving coil 33 not only when the power receiving coil 33 is located away from between the adjacent conductor patterns 22p, 22p, but also when the power receiving coil 33 is close to between the adjacent conductor patterns 22p, 22p (when it is close to the conductor path L).In this case, because the portions P1 to P3 and P6 to P8 on the conductor path L are located away from between the conductor patterns 22p, 22p, the influence of the magnetic field generated around the portions P1 to P3 and P6 to P8 is sufficiently small. This makes it possible to transmit power from the non-contact power transmitting device 2 to the non-contact power receiving device 3 with a constant power transmission efficiency, regardless of the position of the non-contact power receiving device 3 (power receiving coil 33) relative to the non-contact power transmitting device 2 (power transmitting coil).

[0058] In this way, in the contactless power transmission device 2, the coil-forming units 20 are arranged along the circumferential direction, and the conductor patterns 22p of the coil substrates 22 in the coil-forming units 20 are connected to each other via the connecting members 23. When the conductor pattern 22p of one coil-forming unit 20 and the conductor pattern 22p of the other coil-forming unit 20 are connected to each other by connecting the connector 23b1 of one of the circumferentially adjacent coil-forming units 20 to the connector 23b2 of the other, the conductor path L formed by the member 23-1 of one coil-forming unit 20 and the member 23-2 of the other coil-forming unit 20 is located along the board surface of the coil substrate 22 in one coil-forming unit 20, and extends from a portion P1 between the base end of the cable 23a1 and a tip-end side portion that is separated from the base end in a direction away from the conductor pattern 22p of the coil substrate 22, and from the tip-end side portion of the portion P1 to the other end of the conductor pattern 22p in a direction approaching the other end of the conductor pattern 22p. a portion P2 between the tip end side portion of portion P2 and a tip end side portion that is spaced apart from the tip end side portion in a direction approaching the conductor pattern 22p; a portion P3 between the tip end side portion of portion P2 and a tip end side portion that is spaced apart from the tip end side portion in a direction approaching the conductor pattern 22p; and a fourth portion between the tip end side portion of portion P3 and a tip end side portion that is spaced apart from the tip end side portion in a direction approaching one end of the conductor pattern 22p. a portion P5 between the tip end portion of portion P5 and a tip end portion that moves away from the tip end portion along the direction away from the conductor pattern 22p; a portion P6 between the tip end portion of portion P5 and a tip end portion that moves away from the tip end portion along the direction away from the conductor pattern 22p; a portion P7 between the tip end portion of portion P6 and a tip end portion that moves away from the tip end portion along the direction approaching the other end of the conductor pattern 22p; and a portion P8 between the tip end portion of portion P7 and a base end of the cable 23a2 that moves away from the tip end portion along the direction approaching the conductor pattern 22p;The distance between the conductor pattern 22p and the center portion of the portion P2 in one coil-forming unit 20 is longer than the distance between the conductor pattern 22p and the center portion of the portion P4, and the distance between the conductor pattern 22p and the center portion of the portion P7 in the other coil-forming unit 20 is longer than the distance between the conductor pattern 22p and the center portion of the portion P5.

[0059] The contactless power transfer system 1 also includes the contactless power transmitter 2 and a contactless power receiver 3 having a power receiving coil 33.

[0060] Therefore, according to the contactless power transmitter 2 and the contactless power transfer system 1, in the conductor path L formed by the connecting members 23 (members 23-1 and 23-2) connecting the conductor patterns 22p of adjacent coil-forming units 20, the portions P4 and P5 generating a magnetic field in the same direction as the magnetic field generated around the conductor pattern 22p are located closer to the conductor patterns 22p than the portions P2 and P7 generating a magnetic field in the opposite direction to the magnetic field generated around the conductor pattern 22p. This makes it possible to generate an electromotive force in the power receiving coil 33 between the conductor patterns 22p that is approximately the same as the electromotive force generated by coupling with the magnetic field generated around the conductor pattern 22p. As a result, power can be transmitted from the contactless power transmitter 2 to the contactless power receiving device 3 with approximately the same transmission efficiency regardless of the position of the power receiving coil 33 relative to the power transmitting coil, thereby realizing a stable power supply to the supply target X2. Furthermore, by configuring the connecting members 23 (members 23-1, 23-2) with flexible cables 23a1, 23a2, the conductor patterns 22p, 22p of adjacent coil-forming units 20, 20 can be connected after the coil-forming units 20 are fixed to the installation target X1, thereby sufficiently improving the degree of freedom in the installation order of the coil-forming units 20. Furthermore, the connection work of adjacent conductor patterns 22p, 22p (connection work of connectors 23b1, 23b2) can be easily performed.

[0061] Furthermore, in this contactless power transmission device 2, the coil forming unit 20 is configured to include a plurality of coil substrates 22 arranged circumferentially and fixed to a single base 21, and the conductor patterns 22p of adjacent coil substrates 22 are connected to each other by a connecting member 23. Therefore, according to this contactless power transmission device 2 and contactless power transfer system 1, the plurality of coil substrates 22 can be simultaneously positioned with respect to the installation object X1 simply by fixing a single base 21 to the installation object X1. This reduces the number of times the coil forming unit 20 needs to be attached to the installation object X1 compared to a configuration including a "coil forming unit" in which one "coil substrate" is attached to a single "base," and therefore the contactless power transmission device 2 can be easily installed in a short time.

[0062] Furthermore, in this contactless power transmission device 2, the coil forming unit 20 includes a plurality of coil substrates 22 arranged opposite each other with their substrate surfaces parallel to each other and fixed to a single base 21. Therefore, according to this contactless power transmission device 2 and contactless power transfer system 1, by fixing the base 21, on which the two coil substrates 22, 22 arranged opposite each other are mounted, to the installation object X1, it is possible to simultaneously position two locations of the power transmission coil by the conductor patterns 22p, 22p on both coil substrates 22. Since the number of times of the installation work of the coil forming unit 20 to the installation object X1 can be reduced, the contactless power transmission device 2 can be easily installed in a short time.

[0063] The configurations of the "contactless power transmitting device" and the "contactless power transfer system" are not limited to the examples of the configurations of the contactless power transmitting device 2 and the contactless power transfer system 1 described above.

[0064] For example, the configuration has been described as an example including a coil forming unit 20 in which three coil substrates 22a to 22c, each having a conductor pattern 22p forming a part of the power transmission coil and arranged in a line, and three coil substrates 22d to 22f arranged in a line are fixed to one base 21. However, the number of coil substrates 22 arranged along the circumferential direction of the power transmission coil and fixed to one base 21 is not limited to three and may be any plural number such as two, four, or more. Furthermore, the configuration has been described as an example including a coil forming unit 20 having coil substrates 22a to 22c and coil substrates 22d to 22f fixed to the base 21 in a state where the substrate surfaces (surfaces on which the conductor patterns 22p are formed on the substrate main body 22b) are arranged opposite each other and are parallel to each other. However, a configuration in which there are no coil substrates 22 arranged opposite each other (for example, a configuration including only one of the coil substrates 22a to 22c and the coil substrates 22d to 22f) may also be employed. Furthermore, one coil substrate 22 can be fixed to one base 21 to form a "coil forming unit."

[0065] Furthermore, an example has been described in which cables 23a1, 23a2 are of approximately the same length and have connecting members 23 (members 23-1, 23-2) with connectors 23b1, 23b2 located in the longitudinal center of conductor path L; however, the positions of the "first connector" and "second connector" in the "conductor path" are not limited to this example, and the "connecting members (first member and second member)" can also be configured (not shown) so that the "first connector" and "second connector" are located in a position other than the longitudinal center of the "conductor path" by making the length of either the "first cable" or the "second cable" shorter than the other. [Industrial Applicability]

[0066] According to the present invention, in the conductor path L formed by the connecting member 23 (members 23-1 and 23-2) connecting the conductor patterns 22p of adjacent coil-forming units 20, 20, the connecting member 23 is configured so that the portions P4 and P5, where a magnetic field in the same direction as the magnetic field generated around the conductor pattern 22p is generated, are located closer to the conductor patterns 22p than the portions P2 and P7, where a magnetic field in the opposite direction to the magnetic field generated around the conductor pattern 22p is generated. This allows the magnetic field generated around the conductor path L (portions P4 and P5) to be suitably coupled to the power receiving coil 33, which is configured to be suitably coupled to the magnetic field generated around the conductor pattern 22p, so that power can be stably supplied to the supply target X2 regardless of the position of the power receiving coil 33 relative to the power transmitting coil. This allows for wide application to the contactless power transmitting device 2 for contactless power supply and the contactless power transfer system 1 including such a contactless power transmitting device 2. [Explanation of symbols]

[0067] 1. Contactless power transmission system 2. Non-contact power transmission device 3. Contactless power receiving device 10 Connection 20 Coil forming unit 21 Foundation 22, 22a to 22f Coil substrate 22b Board body 22m mold 22p conductor pattern 23 Connecting parts 23-1, 23-2 Materials 23a1, 23a2 cable 23b1, 23b2 connectors 31 Foundation 32 Support member 33 Receiving coil 33a conductor 34 cores 35 Cover 36 O-ring 37 Fastening members 37a Screw 37b Nut L conductor track P1~P8 parts Pa~Pi end PW power supply section X1 Installation target X2 Supply Target

Claims

1. A contactless power transmission device including a power transmission coil and a base to which the power transmission coil is fixed, a plurality of coil-forming units including a coil substrate on which a linear conductor pattern constituting a portion of the circumferential direction of the power transmission coil is formed, the coil substrate being fixed to the base, the coil-forming units being arranged along the circumferential direction, and the conductor patterns of the coil substrates in the coil-forming units being connected to each other via connecting members; the connecting member includes a first member having a first cable whose base end is connected to one end of the conductor pattern in the longitudinal direction and a first connector connected to a tip end of the first cable, and a second member having a second cable whose base end is connected to the other end of the conductor pattern in the longitudinal direction and a second connector connected to a tip end of the second cable, In a state in which the first connector in one of the circumferentially adjacent coil-forming units is connected to the second connector in the other of the adjacent coil-forming units, thereby interconnecting the conductor pattern in the one coil-forming unit and the conductor pattern in the other coil-forming unit, a conductor path formed by the first member in the one coil-forming unit and the second member in the other coil-forming unit is a first portion between the base end of the first cable and a tip end side portion that is spaced apart from the base end in a direction away from the conductor pattern of the coil substrate; a second portion between the tip end side portion of the first portion and a tip end side portion that is spaced apart from the tip end side portion in a direction approaching the other end of the conductor pattern; a third portion between the tip end side portion of the second portion and a tip end side portion that is spaced apart from the tip end side portion in a direction approaching the conductor pattern; and a fourth portion between the tip end side portion of the third portion and a tip end side portion that is spaced apart from the tip end side portion in a direction approaching the one end of the conductor pattern. a fifth portion between the tip portion side portion of the fourth portion and a tip portion side portion that is spaced apart from the tip portion side portion in a direction approaching one end of the conductor pattern; a sixth portion between the tip portion side portion of the fifth portion and a tip portion side portion that is spaced apart from the tip portion side portion in a direction away from the conductor pattern; a seventh portion between the tip portion side portion of the sixth portion and a tip portion side portion that is spaced apart from the tip portion side portion in a direction approaching the other end of the conductor pattern; and an eighth portion between the tip portion side portion of the seventh portion and the base end of the second cable that is spaced apart from the tip portion side portion in a direction approaching the conductor pattern; A contactless power transmission device that is formed so that the distance between the conductor pattern in one of the coil forming units and the central portion in the second location is longer than the distance between the conductor pattern and the central portion in the fourth location, and the distance between the conductor pattern in the other coil forming unit and the central portion in the seventh location is longer than the distance between the conductor pattern and the central portion in the fifth location.

2. The non-contact power transmission device of claim 1, wherein the coil forming unit is configured to include a plurality of coil substrates arranged along the circumferential direction and fixed to one of the bases, and the conductor patterns of adjacent coil substrates are connected to each other by the connecting members.

3. The contactless power transmission device according to claim 1 , wherein the coil forming unit includes a plurality of the coil substrates fixed to the single base and arranged opposite each other so that the substrate surfaces are parallel to each other.

4. The contactless power transmission device according to claim 2 , wherein the coil forming unit includes a plurality of the coil substrates fixed to the single base and arranged opposite each other so that the substrate surfaces are parallel to each other.

5. A contactless power transfer system comprising: the contactless power transmitting device according to any one of claims 1 to 4; and a contactless power receiving device having a power receiving coil.

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