3D wiring structure

Abstract

This invention provides a three-dimensional wiring structure that electrically connects the wiring of two rotating components, enabling compact and efficient wiring connections. [Solution] A three-dimensional wiring structure 2 is provided, comprising: a first resin member 4 and a second resin member 6 rotatably connected; a first conductive member or a first conductive surface formed on the first resin member 4, electrically connected to a first wiring formed on the first resin member 4 and attached to the first resin member 4; a second conductive surface formed on the second resin member 6, electrically connected to a second wiring formed on the second resin member 6 and formed on the second resin member 6; and a spherical or cylindrical rolling member 20 that electrically connects the first wiring and the second wiring when the first resin member 4 and the second resin member 6 rotate relative to each other, wherein when the first resin member 4 and the second resin member 6 rotate relative to each other within a predetermined angle α of less than 360 degrees, the rolling member 20 rolls within the rotation-corresponding region of the first conductive surface or the second conductive surface.

Description

Technical Field

[0001] The present invention relates to two three-dimensional wiring structures provided with wiring members connected in a rotatable state.

Background Art

[0002] In the rotating part of the joint of a robot arm, in many cases, a so-called slip ring structure is used in which a slip ring equipped with brushes is arranged to connect the wiring. However, in the slip ring structure, wear occurs because the brush part and the ring part rub against each other. Therefore, there may be a problem with durability, and rotational resistance due to friction also occurs. To address this, a wiring structure has been proposed in which the wiring of the rotating part is electrically connected to the inner bearing of a bearing, and the wiring of the stationary part is electrically connected to the outer bearing (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When using a bearing, it is possible to rotate the members multiple times, but in the joint of a robot arm, the required rotation angle is often less than 360 degrees. On the other hand, in the joint of a robot arm, it is necessary to connect a large number of wirings. In Patent Document 1, only a pair of wirings can be electrically connected by one bearing. Therefore, in order to realize the connection of a plurality of wirings, it is necessary to arrange a large number of bearings, which makes the occupied space very large and it is difficult to function as the joint of a robot arm.

[0005] Therefore, the object of the present invention is to provide a three-dimensional wiring structure that enables compact and efficient wiring connection, by electrically connecting the wiring of two members without adding any further members such as bearings when the two members with wiring rotate relative to each other within a range of less than 360 degrees. [Means for solving the problem]

[0006] The present invention encompasses the following embodiments. [1] A first resin member and a second resin member connected in a rotatable manner, A first wiring formed on the first resin member is electrically connected to a first conductive member attached to the first resin member or a first conductive surface formed on the first resin member, The second wiring formed on the second resin member is electrically connected to the second conductive surface formed on the second resin member, A spherical or cylindrical rolling member having at least a conductive surface, which, when the first resin member and the second resin member rotate relative to each other, rolls in contact with the first conductive member and the second conductive surface, or rolls in contact with the first conductive surface and the second conductive surface, to electrically connect the first wiring and the second wiring; Equipped with, A three-dimensional wiring structure in which, when the first resin member and the second resin member rotate relative to each other within a predetermined angle range of less than 360 degrees, the rolling member rolls within a rotation-compatible region which is a region of the first conductive surface or the second conductive surface corresponding to the predetermined angle.

[0007] [2] The three-dimensional wiring structure according to [1], wherein the rotation-compatible region has an annular shape formed on a plane perpendicular to the rotation axes of the first resin member and the second resin member, and having a central angle of a predetermined angle or greater with respect to the rotation axis, or a cylindrical surface shape having a central angle of a predetermined angle or greater with respect to the rotation axis as its central axis.

[0008] [3] In the rotational direction of the first resin member and the second resin member, a plurality of the rotation-compatible regions are arranged in a state insulated from each other. The three-dimensional wiring structure according to [2], wherein in each of the rotation-corresponding regions in the rotation direction, the first conductive member and the second conductive surface or the first conductive surface and the second conductive surface are connected by different rolling members, thereby electrically connecting different first and second wirings.

[0009] [4] The rotation-compatible region having the annular shape has a predetermined length in the radial direction when centered on the rotation axis, In the radial direction, a plurality of rotation-compatible regions with different radii are formed in a state insulated from one another. The three-dimensional wiring structure according to [3], wherein in each of the rotation-compatible regions in the radial direction, the first conductive member and the second conductive surface or the first conductive surface and the second conductive surface are connected by different rolling members, thereby electrically connecting different first and second wirings.

[0010] [5] The rotation-compatible region having the cylindrical surface shape has a predetermined length in the direction of the rotation axis, In the direction of the rotation axis, a plurality of the rotation-corresponding regions are formed in a state insulated from each other. The three-dimensional wiring structure according to [3], wherein in each of the rotation-corresponding regions in the direction of the rotation axis, the first conductive member and the second conductive surface or the first conductive surface and the second conductive surface are connected by different rolling members, thereby electrically connecting different first and second wirings.

[0011] [6] A three-dimensional wiring structure according to any one of [1] to [5], wherein the elastic modulus of the rolling member is lower than the elastic modulus of the first resin member and the second resin member.

[0012] [7] The first conductive member includes a spring having a conductive surface that contacts the rolling member. When the rolling member rolls while contacting the first conductive member and the second conductive surface, the rolling member contacting the spring rolls while being pressed against the second conductive surface by the biasing force of the spring. The three-dimensional wiring structure according to any one of [1] to [6].

[0013] [8] When the rolling member rolls while contacting the first conductive surface and the second conductive surface, the first conductive surface and the second conductive surface are arranged to face each other while always maintaining a state of being separated by the outer diameter of the rolling member. The three-dimensional wiring structure according to any one of [1] to [6].

[0014] [9] The rolling member has a guide surface formed so as to roll along the first conductive surface or the second conductive surface. The three-dimensional wiring structure according to any one of [1] to [8].

[0015]

[10] The first conductive surface or the second conductive surface is disposed on the bottom surface of a concave groove formed in the first resin member or the second resin member. The three-dimensional wiring structure according to any one of [1] to [9].

[0016]

[11] The rolling member has a cylindrical surface shape with a flange. The first conductive surface or the second conductive surface is disposed on the upper surface of a convex rail formed in the first resin member or the second resin member. The three-dimensional wiring structure according to any one of [1] to [9]. [Advantages of the Invention]

[0017] According to one aspect of the present invention, when two members with wiring rotate relative to each other within a range of less than 360 degrees, the wirings of the two members can be electrically connected without adding an additional member such as a bearing, and a three-dimensional wiring structure capable of providing a compact and efficient wiring connection can be provided.

Brief Description of the Drawings

[0018] [Figure 1] It is a side cross-sectional view schematically showing a three-dimensional wiring structure according to the first embodiment of the present invention. [Figure 2] It is a side cross-sectional view schematically showing a modification 1 of the three-dimensional wiring structure according to the first embodiment of the present invention. [Figure 3] It is a side cross-sectional view schematically showing a further modification 2 of the three-dimensional wiring structure according to the first embodiment of the present invention. [Figure 4A] It is a perspective view seen from the side of the first resin member schematically showing a three-dimensional wiring structure according to the second embodiment of the present invention. [Figure 4B] It is a perspective view seen from the side of the second resin member schematically showing a three-dimensional wiring structure according to the second embodiment of the present invention. [Figure 5A] It is a perspective view seen from the side of the first resin member schematically showing a modification of the three-dimensional wiring structure according to the second embodiment of the present invention. [Figure 5B] It is a perspective view seen from the side of the second resin member schematically showing a three-dimensional wiring structure according to the second embodiment of the present invention. [Figure 6] It is a perspective view schematically showing a three-dimensional wiring structure according to the third embodiment of the present invention. [Figure 7] It is a view showing the cross-section A-A of FIG. 6, and is a side cross-sectional view schematically showing a three-dimensional wiring structure according to the third embodiment of the present invention. [Figure 8A] It is a side cross-sectional view schematically showing an example of a concave groove in which the first and second conductive surfaces are formed on the bottom surface. [Figure 8B] It is a side cross-sectional view schematically showing other examples of a concave groove in which the first and second conductive surfaces are formed on the bottom surface. [Figure 9] It is a view showing the cross-section A-A of FIG. 6, and is a side cross-sectional view schematically showing a modification of the three-dimensional wiring structure according to the third embodiment of the present invention. [Figure 10] It is a perspective view schematically showing a three-dimensional wiring structure according to the fourth embodiment of the present invention. [Figure 11]This is a schematic side cross-sectional view showing an example of a convex rail with first and second conductive surfaces formed on its upper surface. [Modes for carrying out the invention]

[0019] Embodiments for carrying out the present invention will be described below with reference to the drawings. In each drawing, corresponding components having the same function are denoted by the same reference numerals. For convenience, embodiments may be shown separately to facilitate explanation or understanding of key points, but partial substitution or combination of configurations shown in different embodiments is possible. In the embodiments described later, descriptions of matters common to the previously described embodiments will be omitted, and only the differences will be explained. In particular, similar effects and advantages due to similar configurations will not be mentioned sequentially for each embodiment. The size and positional relationships of components shown in the drawings may be exaggerated to clarify the explanation.

[0020] (Three-dimensional wiring structure according to the first embodiment) First, a three-dimensional wiring structure according to the first embodiment of the present invention will be described with reference to Figure 1. Figure 1 is a schematic side cross-sectional view showing the three-dimensional wiring structure according to the first embodiment of the present invention.

[0021] The three-dimensional wiring structure 2 according to this embodiment comprises a first resin member 4 and a second resin member 6 connected in a rotatable manner. The three-dimensional structure of the first resin member 4 and the second resin member 6 is the same as the shape shown in Figure 6, which shows the third embodiment described later, and in Figure 10, which shows the fourth embodiment. In other words, Figure 1 shows a cross-section at the same position as cross-section AA in Figure 6. However, while the first resin member 4 shown in Figure 6 has a first conductive surface 10n, the first resin member 4 of this embodiment differs in that it does not have a first conductive surface and instead has a first conductive member 30 as described below.

[0022] To describe the connection structure between the first resin member 4 and the second resin member 6 in more detail, as shown in the perspective view of Figure 6, a rotational shaft hole 8a is formed in the first resin member 4, and a rotational shaft region 8 is integrally provided protruding from the second resin member 6. The rotational shaft region 8 formed in the second resin member 6 is inserted into the rotational shaft hole 8a formed in the first resin member 4, and the first resin member 4 and the second resin member 6 are mounted in a state that allows them to rotate relative to each other with the rotational shaft G as the center of rotation. The rotational shaft G coincides with the central axis of the cylindrical rotational shaft region 8. However, this is not the only option, and for example, there may be cases where rotational shaft holes are formed in the first resin member 4 and the second resin member 6, and a rotational shaft member of a separate component is inserted.

[0023] A first wiring 40 is formed on the first resin member 4, and further, the first resin member 4 includes a first conductive member 30 that is electrically connected to the first wiring 40. Here, "electrically connected" means that the two conductive members are connected in such a way that electricity can flow between them, and the two conductive members may be in direct contact or connected via other conductive members. A through hole is formed in the region of the first resin member 4 where the first wiring 40 is formed, and a support 36 is placed inside the through hole. A spring 32 and a screw member 34 are placed inside the support 36. The support 36 may be made of a conductive metal or the like, or it may be made of an insulating material. It should be noted that the support 36 is not an essential component, and there may be cases where the support 36 is not present, meaning that the spring 32 and screw member 34 are directly placed inside the through hole.

[0024] The screw member 34 is either a metal screw member or a metal-plated resin screw member, and has at least a conductive surface. Similarly, the spring 32 is either a metal spring or a metal-plated resin spring, and has at least a conductive surface. The screw member 34 is screwed into the outside of the first wiring 40, and the tip of the screw member 34 abuts against one end of the spring 32. The spring 32 is a compression spring, and the other end of the spring 32 abuts against the rolling member 20.

[0025] The rolling member 20 may have a spherical shape and be made of a conductive metal material, or it may be a sphere made of a resin material or the like with a conductive metal plating on its surface. At least the surface of the rolling member 20 is conductive.

[0026] The biasing force of the spring 32 presses the rolling member 20 toward the second resin member 6. Since the screw member 34, the spring 32, and the rolling member 20 have conductive surfaces at least, the rolling member 20 is electrically connected to the first wiring 40 via the screw member 34 and the spring 32.

[0027] On the other hand, the second resin member 6 has a second wiring 42 formed on it. Furthermore, the second resin member 6 has a cylindrical surface with the rotation axis G as its central axis, and a conductive layer is formed on this surface that is electrically connected to the second wiring 42. As a result, the second resin member 6 has a second conductive surface 12 that is electrically connected to the second wiring and has a cylindrical surface with the rotation axis G as its central axis. possess,

[0028] Due to the biasing force of the spring 32, the rolling member 20 is always in contact with the second conductive surface 12. As a result, when the first resin member 4 and the second resin member 6 rotate relative to each other, the rolling member 20 rolls while in contact with the spring 32 and the second conductive surface 12 of the first conductive member 30. Guided by the support 36, the rolling member 20 can roll smoothly while in contact with the spring 32 and the second conductive surface 12 at the position of the first conductive member 30. This allows the first wiring 40 formed on the first resin member 4 and the second wiring 42 formed on the second resin member 6 to be electrically connected.

[0029] Furthermore, the second conductive surface 12 can also be formed on the bottom surface of the groove 14 formed in the second resin member (see Figure 8B). In that case, the spherical rolling member 20 is guided by the guide surface 14a, which is the inner surface of the groove 14, allowing it to roll more stably.

[0030] In this embodiment, when the first resin member 4 and the second resin member 6 rotate relative to each other within a predetermined angle α of less than 360 degrees, the rolling member 20 rolls within a rotation-compatible region, which is the region of the second conductive surface 12 corresponding to the predetermined angle α. In the example shown in Figure 1, θ is shown as the center angle of the cylindrical surface shape that constitutes the rotation-compatible region of the second conductive surface 12. Stoppers 18 are provided at both ends of the rotation-compatible region (second conductive surface 12) indicated by the center angle θ. This ensures that the rolling member 20 rolls reliably within the rotation-compatible region (second conductive surface 12). Thus, a space-saving and efficient wiring connection structure is obtained that corresponds to the predetermined angle α of rotation between the first resin member 4 and the second resin member 6.

[0031] The central angle θ of the cylindrical surface shape that constitutes the rotation-compatible region (second conductive surface 12) is set to be greater than or equal to a predetermined angle α, which is the maximum angle by which the first resin member 4 and the second resin member 6 rotate relative to each other. Therefore, since the rotation-compatible region (second conductive surface 12) has a cylindrical surface shape with a central angle θ greater than or equal to the predetermined angle α, the first wiring 40 and the second wiring 42 can be reliably electrically connected at any rotational position of the first resin member 4 and the second resin member 6. Note that the "central angle greater than or equal to the predetermined angle α" is preferably an angle closer to (smaller than) the predetermined angle α, within the range in which reliable wiring connection is possible when rotated by the predetermined angle α, taking into account tolerances and manufacturing errors.

[0032] As described above, in the first embodiment, the first conductive member 30 includes a spring 32 which is a component of the first conductive member 30 and has a conductive surface that contacts the rolling member 20. When the rolling member 20 rolls while in contact with the first conductive member 30 and the second conductive surface 12, the rolling member 20 in contact with the spring 32 is pressed against the second conductive surface 12 by the biasing force of the spring as it rolls.

[0033] Therefore, the biasing force of the spring 32 ensures that the first wiring 40 - first conductive member 30 (spring 32 via screw member 34) - rolling member 20 - second conductive surface 12 - second wiring 42 are reliably electrically connected in that order.

[0034] When the first resin member 4 and the second resin member 6 have a three-dimensional structure as shown in Figure 6, multiple rotation-compatible regions (second conductive surfaces 12) can be arranged in the direction of the rotation axis G of the first resin member 4 and the second resin member 6 while being insulated from each other. In other words, in Figure 1, multiple structures shown in Figure 1 can be arranged side by side in a direction perpendicular to the drawing, while being insulated from each other. This makes it possible to provide multiple electrical connection structures such as first wiring 40 - first conductive member 30 - rolling member 20 - second conductive surface 12 - second wiring 42. In Figure 1, it is shown as the second conductive surface 12, but it can also be shown in the drawing as the nth structure of multiple electrical connection structures arranged side by side in a direction perpendicular to the drawing, as the second conductive surface 12n.

[0035] Thus, when multiple rotation-compatible regions (second conductive surfaces 12) are arranged in a manner that insulates them from one another in the direction of the rotation axis G, multiple different electrical connection structures can be realized, allowing for more wiring connections to be made efficiently in a space-saving manner.

[0036] (Modified example 1 of the three-dimensional wiring structure according to the first embodiment) Next, with reference to Figure 2, a modified example 1 of the three-dimensional wiring structure according to the first embodiment will be described. Figure 2 is a schematic side cross-sectional view showing a modified example 1 of the three-dimensional wiring structure according to the first embodiment of the present invention. This modified example 1 differs from the first embodiment shown in Figure 1 in that it has multiple rotation-compatible regions in the rotational direction.

[0037] In the example shown in Figure 2, two rotation-compatible regions are arranged in a manner that insulates them from each other in the rotational direction of the first resin member 4 and the second resin member 6. One rotation-compatible region is composed of a second conductive surface 12An, and the other rotation-compatible region is composed of a second conductive surface 12Bn. Here, the "n" in the second conductive surfaces 12An and 12Bn refers to the nth structure of a plurality of electrical connection structures arranged in the direction of the rotation axis G (the direction perpendicular to the drawing).

[0038] A first conductive member 30An is positioned in one rotation-compatible region (second conductive surface 12An), and a first conductive member 30Bn is positioned in the other rotation-compatible region (second conductive surface 12Bn). In each rotation-compatible region, the first conductive members 30An, 30Bn and the second conductive surfaces 12An, 12Bn are connected by different rolling members 20, electrically connecting different first wirings 40An, 40Bn and second wirings 42An, 42Bn, respectively.

[0039] In other words, in the rotational direction of the first resin member 4 and the second resin member 6, a first electrical connection structure consisting of the first wiring 40An - first conductive member 30An - rolling member 20 - second conductive surface 12An - second wiring 42An and a second electrical connection structure consisting of the first wiring 40Bn - first conductive member 30Bn - rolling member 20 - second conductive surface 12Bn - second wiring 42Bn, which is insulated from the first connection structure, are formed.

[0040] To obtain such a first and second electrical connection structure, in the example shown in Figure 2, the predetermined angle α, which is the maximum angle at which the first resin member 4 and the second resin member 6 rotate relative to each other, is approximately half that of Figure 1. As a result, the central angle θA of the cylindrical surface shape that constitutes the rotational region of the second conductive surface 12An, and the central angle θB of the cylindrical surface shape that constitutes the rotational region of the second conductive surface 12Bn, are both set to be greater than or equal to the predetermined angle α. The central angles θA and θB may be the same or different.

[0041] In the example shown in Figure 2, two electrical connection structures are arranged, but it is possible to further extend the second conductive surface 12 in the rotational direction of the first resin member 4 and the second resin member 6, and it is also possible to arrange three or more electrical connection structures. If the predetermined angle α in which the first resin member 4 and the second resin member 6 rotate relative to each other is even smaller, it is possible to arrange even more electrical connection structures depending on the predetermined angle α.

[0042] As described above, in the modified example 1 of the three-dimensional wiring structure according to the first embodiment, a plurality of rotation-compatible regions are arranged in a state insulated from each other in the rotational direction of the first resin member 4 and the second resin member 6, and in each rotation-compatible region in the rotational direction, the first conductive member (30An, 30Bn, etc.) and the second conductive surface (12An, 12B, etc.) are connected by different rolling members 20, and different first wirings (40An, 40Bn, etc.) and second wirings (42An, 42Bn, etc.) can be electrically connected.

[0043] In Modification 1, since multiple rotation-compatible regions are arranged in an insulated state in the rotation direction, multiple different wiring connections can be realized, and more wiring connections can be made efficiently in a space-saving manner. In particular, by combining the case where multiple electrical connection structures are formed in the rotation direction with the case where multiple electrical connection structures are formed in the direction of the rotation axis G, more wiring connections can be made efficiently in a space-saving manner. If the number of different insulated electrical connection structures in the direction of the rotation axis G is N, and the number of different insulated electrical connection structures in the rotation direction according to Modification 1 is L, then a large number of N × L different insulated electrical connection structures can be obtained in a space-saving manner.

[0044] (Modified example 2 of the three-dimensional wiring structure according to the first embodiment) Next, with reference to Figure 3, a modified example 2 of the three-dimensional wiring structure according to the first embodiment will be described. Figure 3 is a schematic side cross-sectional view showing a modified example 2 of the three-dimensional wiring structure according to the first embodiment of the present invention. In the three-dimensional wiring structure 2 shown in Figures 1 and 2, the second conductive surface 12 has a cylindrical shape with the rotation axis G as its central axis, but in modified example 2, the second conductive surface 12 has an annular shape centered on the rotation axis G, formed on a plane perpendicular to the rotation axis G. Here, the arrow R shown in Figure 3 indicates the radial direction, and indicates the direction from the center of the annular shape to the outer circumference of the annule.

[0045] The second conductive surface 12 is formed on the bottom surface of the annular groove 14. For example, it has the shape shown by reference numerals 12n and 14 in the perspective view of Figure 4A. In the modified example 2, the first conductive member 30 is equipped with a spring 32 having a conductive surface that contacts the rolling member 20, and when the rolling member 20 rolls while in contact with the first conductive member 30 and the second conductive surface 12, the rolling member 20, which is in contact with the spring 32, rolls while being pressed against the second conductive surface 12 by the biasing force of the spring 32.

[0046] The rotation-compatible region having an annular shape formed by the second conductive surface 12 has a predetermined length in the radial direction R when the rotation axis G is centered, and multiple rotation-compatible regions with different radii are formed in a state where they are insulated from each other in the radial direction. In the illustrated example, the (m-1), (m), and (m+1) rotation-compatible regions with different radii are shown.

[0047] In each rotation-compatible region in the radial direction R, the first conductive members 30m-1, m, m+1 and the second conductive surfaces 12m-1, m, m+1 are connected by different rolling members 20, electrically connecting different first wirings 40m-1, m, m+1 and second wirings 42m-1, m, m+1. Multiple rotation-compatible regions with different radii (first conductive member 30m, second conductive surface 12m) in the radial direction R centered on the axis of rotation can realize multiple different wiring connections.

[0048] Furthermore, in the rotation-compatible region of the second conductive surface 12 having an annular shape, similarly to the above, multiple rotation-compatible regions are arranged in a state of mutual isolation in the rotational direction of the first resin member 4 and the second resin member 6, and in each rotation-compatible region in the rotational direction, the first conductive member 30m and the second conductive surface 12m are connected by different rolling members 20, thereby electrically connecting different first wiring 40m and second wiring 42m.

[0049] In this case, if we let M be the number of different, mutually insulated electrical connection structures that can be realized by multiple rotation-compatible regions with different radii in the radial direction, and L be the number of different, mutually insulated electrical connection structures in the rotational direction, then a large number of M × L different, mutually insulated electrical connection structures can be obtained in a small space.

[0050] (Three-dimensional wiring structure according to the second embodiment) Next, a three-dimensional wiring structure according to a second embodiment of the present invention will be described with reference to Figures 4A and 4B. Figure 4A is a schematic perspective view from the first resin member side showing the three-dimensional wiring structure according to a second embodiment of the present invention. Figure 4B is a schematic perspective view from the second resin member side showing the three-dimensional wiring structure according to a second embodiment of the present invention. Here, the arrow R shown in Figures 4A and 4B indicates the radial direction, indicating the direction from the center of the annular shape to the outer circumference of the annule.

[0051] In the first embodiment described above, the rolling member 20 rolls while in contact with the first conductive member 30 and the second conductive surface 12, electrically connecting the first wiring 40 and the second wiring 42. However, the embodiments described below, including the second embodiment, differ in that the first resin member 4 does not have the first conductive member 30, but instead has the first conductive surface 10. In the embodiments from the second embodiment onward, the rolling member 20 rolls while in contact with the first conductive surface 10 and the second conductive surface 12, electrically connecting the first wiring 40 and the second wiring 42.

[0052] Furthermore, in the first embodiment described above, the second conductive surface 12 constituting the rotation-compatible region has a cylindrical shape with the rotation axis G as its central axis, whereas in the second embodiment, the first conductive surface 10 and the second conductive surface 12 constituting the rotation-compatible region have annular shapes formed on a plane perpendicular to the rotation axis G. The first conductive surface 10 and the second conductive surface 12 are formed on the bottom surface of an annular groove 14. In this embodiment, a rotation shaft hole 8a is formed in the first resin member 4 and the second resin member 6, and a rotation shaft member of another member is inserted. However, it is not limited to this, and in some cases, a rotation shaft integrally projecting from the other resin member may be inserted into the rotation shaft hole formed in one of the first resin member 4 and the second resin member 6.

[0053] In this embodiment, the annular rotation-compatible region (first conductive surface 10, second conductive surface 12) has a predetermined length in the radial direction when centered on the rotation axis G, and multiple rotation-compatible regions with different radii (first conductive surface 10m, second conductive surface 12m) are formed in a state where they are insulated from each other in the radial direction. In Figures 4A and 4B, the first conductive surface 10m and the second conductive surface 12m are shown as the mth rotation-compatible region of multiple rotation-compatible regions arranged in a state where they are insulated from each other in the radial direction.

[0054] In the illustrated example, the first wiring 40m is formed on the opposite side of the surface on which the first conductive surface 10m is formed, and the first wiring 40m and the first conductive surface 10m are electrically connected via a conductive layer formed in a through-hole. Similarly, the second wiring 42m is formed on the opposite side of the surface on which the second conductive surface 12m is formed, and the second wiring 42m and the second conductive surface 12m are electrically connected via a conductive layer formed in a through-hole.

[0055] When the first resin member 4 and the second resin member 6 rotate relative to each other, the spherical rolling member 20 rolls while in contact with the first conductive surface 10m and the second conductive surface 12m, electrically connecting the first wiring 40m and the second wiring 42m. At this time, the spherical rolling member 20 is guided by the inner surface of the groove 14 and can roll stably while in contact with the first conductive surface 10 and the second conductive surface 12.

[0056] In each of the radially rotating regions (first conductive surface 10m, second conductive surface 12m), the first conductive surface 10m and the second conductive surface 12m are connected by different rolling members 20, and electrically connect to different first wiring 40m and second wiring 42m, respectively.

[0057] Thus, since multiple rotation-compatible regions (first conductive surface 10m, second conductive surface 12m) are arranged in a state of mutual isolation in the radial direction centered on the rotation axis G, multiple different electrical connection structures can be realized, and more wiring connections can be made efficiently in a space-saving manner.

[0058] In the second embodiment, when the rolling member 20 rolls in contact with the first conductive surface 10m and the second conductive surface 12m, the first conductive surface 10m and the second conductive surface 12m are always positioned opposite each other, separated by an amount equal to the outer diameter of the rolling member 20.

[0059] In this way, since the first conductive surface 10m and the second conductive surface 12m are always positioned opposite each other with a gap equal to the outer diameter of the rolling member 20, the first resin member 4 and the second resin member 6 can rotate with little resistance, and the first wiring 40m - first conductive surface 10m - rolling member 20 - second conductive surface 12m - second wiring 42m can be reliably connected electrically in that order.

[0060] Although the drawing shows the groove 14 formed around the entire circumference, when the first resin member 4 and the second resin member 6 rotate relative to each other within a predetermined angle range of less than 360 degrees, the first conductive surface 10m and the second conductive surface 12m, which constitute the rotation-compatible region on which the rolling member 20 rolls, only need to be provided in the region corresponding to the predetermined angle. Stoppers can be provided at both ends of the rotation-compatible region (first conductive surface 10m, second conductive surface 12m) to ensure that the rolling member 20 rolls only within the rotation-compatible region (first conductive surface 10m, second conductive surface 12m).

[0061] In areas other than the rotation-compatible region, the groove 14 can be used for other purposes. Furthermore, a structure can be adopted in which the first resin member 4 and the second resin member 6 are cut out in areas other than the rotation-compatible region (first conductive surface 10m, second conductive surface 12m). In this way, by forming the rotation-compatible region (first conductive surface 10m, second conductive surface 12m) only in areas corresponding to a predetermined angle of rotation between the first resin member 4 and the second resin member 6, the first wiring 40 and the second wiring 42 can be electrically connected. Therefore, a space-saving and efficient wiring connection structure corresponding to the rotation angles of the first resin member 4 and the second resin member 6 can be obtained.

[0062] In this embodiment as well, the central angle of the annular rotation-compatible region (first conductive surface 10m, second conductive surface 12m) formed on a plane perpendicular to the rotation axis G of the first resin member 4 and the second resin member 6 is set to be greater than or equal to a predetermined angle by which the first resin member 4 and the second resin member 6 rotate relative to each other. Therefore, the annular rotation-compatible region (first conductive surface 10m, second conductive surface 12m) has a central angle greater than or equal to a predetermined angle. Because it has a shape, the first resin member 4 and the second resin member 6 can be reliably positioned at any rotational position. The first wiring 40 and the second wiring 42 can be electrically connected.

[0063] (Modified example of the three-dimensional wiring structure according to the second embodiment) Next, a modified example of the three-dimensional wiring structure according to the second embodiment of the present invention will be described with reference to Figures 5A and 5B. Figure 5A is a schematic perspective view from the first resin member side showing a modified example of the three-dimensional wiring structure according to the second embodiment of the present invention. Figure 5B is a schematic perspective view from the second resin member side showing the three-dimensional wiring structure according to the second embodiment of the present invention. This modified example differs from the second embodiment shown in Figures 4A and 4B in that it has multiple rotation-compatible regions in the rotational direction. Here, the arrow R shown in Figures 5A and 5B indicates the radial direction, and indicates the direction from the center of the annular shape to the outer circumference of the annule.

[0064] In the example shown in Figures 5A and 5B, four rotation-compatible regions are arranged in a state of mutual isolation in the rotational direction of the first resin member 4 and the second resin member 6. The first rotation-compatible region is composed of a first conductive surface 10Am and a second conductive surface 12Am, the second rotation-compatible region is composed of a first conductive surface 10Bm and a second conductive surface 12Bm, the third rotation-compatible region is composed of a first conductive surface 10Cm and a second conductive surface 12Cm, and the fourth rotation-compatible region is composed of a first conductive surface 10Dm and a second conductive surface 12Dm. Here, the "m" in the first conductive surfaces 10Am to 10Dm and the second conductive surfaces 12Am to 12Dm refers to the m-th structure of a plurality of electrical connection structures arranged radially around the rotation axis G.

[0065] In each of the first to fourth rotation-compatible regions (first conductive surface 10Am~10Dm, second conductive surface 12Am~12Dm), the first conductive surface 10Am~10Dm and the second conductive surface 12Am~12Dm are connected by different rolling members 20, electrically connecting different first wiring 40Am~40Dm and second wiring 42Am~42Dm, respectively. Stoppers 18 are placed at the ends of the first to fourth rotation-compatible regions (first conductive surface 10Am~10Dm, second conductive surface 12Am~12Dm) to ensure that the rolling members 20 roll reliably within their respective rotation-compatible regions (first conductive surface 10Am~10Dm, second conductive surface 12Am~12Dm).

[0066] In other words, in the rotational direction of the first resin member 4 and the second resin member 6, there is a first electrical connection structure consisting of a first wiring 40Am - first conductive surface 10Am - rolling member 20 - second conductive surface 12Am - second wiring 42Am, a second electrical connection structure consisting of a first wiring 40Bm - first conductive surface 10Bm - rolling member 20 - second conductive surface 12Bm - second wiring 42Bm, a third electrical connection structure consisting of a first wiring 40Cm - first conductive surface 10Cm - rolling member 20 - second conductive surface 12Cm - second wiring 42Cm, and a fourth electrical connection structure consisting of a first wiring 40Dm - first conductive surface 10Dm - rolling member 20 - second conductive surface 12Dm - second wiring 42Dm.

[0067] To obtain such first to fourth electrical connection structures, in the examples shown in Figures 5A and 5B, the predetermined angle at which the first resin member 4 and the second resin member 6 rotate relative to each other is 360 degrees / 4, or 90 degrees or less. For example, to obtain S different electrical connection structures from the first to the Sth, the predetermined angle at which the first resin member 4 and the second resin member 6 rotate relative to each other must be 360 ​​degrees / S or less. In other words, the number of electrical connection structures that can be obtained is determined by the required rotation angles of the first resin member 4 and the second resin member 6.

[0068] As a result, the central angles of the annular shapes that constitute the rotational regions of the first conductive surface 10Am to 10Dm and the second conductive surface 12Am to 12Dm are both set to be greater than or equal to a predetermined angle at which the first resin member 4 and the second resin member 6 rotate.

[0069] As described above, in the modified three-dimensional wiring structure according to the second embodiment, a plurality of rotation-compatible regions (first conductive surface 10Am~10Dm, second conductive surface 12Am~12Dm) are arranged in a state of mutual insulation in the rotation direction of the first resin member 4 and the second resin member 6, and in each rotation-compatible region in the rotation direction, the first conductive surface (10Am~10Dm) and the second conductive surface (12Am~12Dm) are connected by different rolling members 20, and different first wiring (40Am~40Dm) and second wiring (42Am~42Dm) can be electrically connected.

[0070] In a modified example of the three-dimensional wiring structure according to the second embodiment, multiple rotation-compatible regions are arranged in a state of mutual isolation in the rotational direction, thereby enabling multiple different wiring connections and allowing for more wiring connections to be made efficiently in a space-saving manner. In particular, by combining the second embodiment and the modified example described above, it is possible to make more wiring connections efficiently in a space-saving manner. If the number of mutually isolated different electrical connection structures in the radial direction centered on the rotation axis G according to the second embodiment is M, and the number of mutually isolated different electrical connection structures in the rotational direction according to the modified example is L, then a large number of mutually isolated different electrical connection structures, M × L in number, can be obtained in a space-saving manner.

[0071] (Three-dimensional wiring structure according to the third embodiment) Next, a three-dimensional wiring structure according to the third embodiment of the present invention will be described with reference to Figures 6 and 7. Figure 6 is a schematic perspective view showing a three-dimensional wiring structure according to a third embodiment of the present invention. Figure 7 is a cross-sectional view of section AA in Figure 6, and is a schematic side cross-sectional view showing a three-dimensional wiring structure according to a third embodiment of the present invention.

[0072] In the third embodiment, a rotating shaft region 8 integrally projected from the second resin member 6 is inserted into a rotating shaft hole provided in the first resin member 4, and the two are connected in a state that they can rotate around the rotating shaft G. However, this is not the only embodiment, and for example, rotating shaft holes may be formed in the first resin member 4 and the second resin member 6, and a rotating shaft member of a different member may be inserted. In the third embodiment, the first resin member 4 has a first conductive surface 10, and the second resin member 6 has a second conductive surface 12. In this embodiment, both the first conductive surface 10 and the second conductive surface 12 have a cylindrical surface shape with the rotating shaft G of the first resin member 4 and the second resin member 6 as the central axis. The rolling member 20 has a cylindrical shape, and the rolling member 20 rolls while in contact with the first conductive surface 10 and the second conductive surface 12, electrically connecting the first wiring 40 and the second wiring 42.

[0073] As shown in Figure 6, in this embodiment, a rotation-compatible region having a cylindrical surface shape has a predetermined length in the direction of the rotation axis G, and multiple rotation-compatible regions are formed in a state where they are insulated from each other in the direction of the rotation axis G, and in each rotation-compatible region in the direction of the rotation axis G, the first conductive surface 10n and the second conductive surface 12n are connected by different rolling members 20, and different first wiring 40n and second wiring 42n are electrically connected. "n" refers to the nth of the multiple cylindrical first conductive surfaces 10 and second conductive surfaces 12 arranged in the direction of the rotation axis G.

[0074] In this embodiment, since multiple rotation-compatible regions are arranged in an insulated manner in the direction of the rotation axis G, multiple different wiring connections can be realized, and more wiring connections can be made efficiently in a space-saving manner.

[0075] In the third embodiment, when the rolling member 20 rolls in contact with the first conductive surface 10n and the second conductive surface 12n, the first conductive surface 10n and the second conductive surface 12n are always positioned opposite each other, separated by an amount equal to the outer diameter of the rolling member 20.

[0076] In this way, since the first conductive surface 10n and the second conductive surface 12n are always positioned opposite each other with a gap equal to the outer diameter of the rolling member 20, the first resin member 4 and the second resin member 6 can rotate with little resistance, and the first wiring 40n, the first conductive surface 10n, the rolling member 20, the second conductive surface 12n, and the second wiring 42n can be reliably electrically connected in that order.

[0077] In the second embodiment, the third embodiment, and the fourth embodiment described later, it is preferable that the elastic modulus of the rolling member 20 is lower than that of the first resin member 4 and the second resin member 6. The same applies whether the shape of the rolling member 20 is cylindrical or spherical. Because the elastic modulus of the rolling member 20 is lower than that of the first resin member 4 and the second resin member 6, the rolling member 20 rolls smoothly when the first resin member 4 and the second resin member 6 rotate, allowing them to rotate with low rotational resistance and reliably electrically connect the first wiring 40 and the second wiring 42.

[0078] In this embodiment as well, the first conductive surface 10 and the second conductive surface 12 are formed on the bottom surface of the groove 14. The structure of the groove 14 will be described with reference to Figure 8A. Figure 8A is a schematic side cross-sectional view showing an example of a groove in which the first and second conductive surfaces are formed on the bottom surface. Figure 8A is a cross-sectional view taken from the direction in which the rolling member 20 rolls. Here, the n-1th, nth and n+1th rotation-corresponding regions (the first conductive surface 10 and the second conductive surface 12), which are arranged in an insulated state in the direction of the rotation axis G, are shown with the numbers n-1, n and n+1.

[0079] The cylindrical rolling member 20 is guided by the guide surface 14a, which is the inner surface of the groove 14 formed in the first resin member 4 and the second resin member 6, allowing it to roll smoothly in a stable state. As a result, the rotational resistance when the first resin member 4 and the second resin member 6 rotate relative to each other can also be reduced.

[0080] In this embodiment, not only cylindrical rolling members 20 but also spherical rolling members 20 can be used. The structure of the groove 14 in this case will be explained with reference to Figure 8B. Figure 8B is a schematic side cross-sectional view showing another example of a groove in which the first and second conductive surfaces are formed on the bottom surface. Figure 8B is also a cross-sectional view taken from the direction in which the rolling member 20 rolls. Even in the case of a spherical rolling member 20, the rolling member 20 is guided by the guide surface 14a, which is the inner surface of the groove 14 formed in the first resin member 4 and the second resin member 6, and can roll smoothly in a stable state. Therefore, the rotational resistance when the first resin member 4 and the second resin member 6 rotate relative to each other can also be reduced.

[0081] Thus, if the rolling member 20 has a guide surface 14a formed to roll along the first conductive surface 10 or the second conductive surface 12, the guide surface 14a ensures that the rolling member 20 rolls in a state of contact with both the first conductive surface 10 and the second conductive surface 12.

[0082] In particular, when the first conductive surface 10 or the second conductive surface 12 is positioned on the bottom surface of a groove 14 formed in the first resin member 4 or the second resin member 6, the groove 14 can reliably form a guide surface 14a, and the multiple first conductive surfaces 10 and second conductive surfaces 12 can be reliably kept insulated.

[0083] In this embodiment, when the first resin member 4 and the second resin member 6 rotate relative to each other within a predetermined angle α of less than 360 degrees, the rolling member 20 rolls within a rotation-compatible region which corresponds to the predetermined angle α of the first conductive surface 10n and the second conductive surface 12n. In the example shown in Figure 7, θ is shown as the center angle of the cylindrical surface shape that constitutes the rotation-compatible region of the first conductive surface 10n and the second conductive surface 12n. Stoppers 18 are provided at both ends of the rotation-compatible region (first conductive surface 10n, second conductive surface 12n) indicated by the center angle θ, ensuring that the rolling member 20 rolls reliably within the rotation-compatible region (first conductive surface 10n, second conductive surface 12n). Thus, a space-saving and efficient wiring connection structure corresponding to the rotation angles of the first resin member 4 and the second resin member 6 can be obtained.

[0084] The central angle θ of the cylindrical surface shape that constitutes the rotation-compatible region (first conductive surface 10n, second conductive surface 12n) is set to be greater than or equal to a predetermined angle α, which is the maximum angle by which the first resin member 4 and the second resin member 6 rotate relative to each other. Therefore, since the rotation-compatible region (first conductive surface 10n, second conductive surface 12n) has a cylindrical surface shape with a central angle θ of greater than or equal to the predetermined angle α, the first wiring 40 and the second wiring 42 can be reliably electrically connected at any rotational position of the first resin member 4 and the second resin member 6.

[0085] (Modified example of the three-dimensional wiring structure according to the third embodiment) Next, with reference to Figure 9, a modified example of the three-dimensional wiring structure according to the third embodiment will be described. Figure 9 is a diagram showing cross-section AA of Figure 6, and is a schematic side cross-sectional view showing a modified example of the three-dimensional wiring structure according to the third embodiment of the present invention. This modified example differs from the third embodiment shown in Figure 7 in that it has multiple rotation-compatible regions in the rotational direction.

[0086] In the example shown in Figure 9, two rotation-compatible regions are arranged in a manner that insulates them from each other in the rotational direction of the first resin member 4 and the second resin member 6. One rotation-compatible region is composed of a first conductive surface 10An and a second conductive surface 12An, while the other rotation-compatible region is composed of a first conductive surface 10Bn and a second conductive surface 12Bn. Here, the "n" in the second conductive surfaces 12An and 12Bn refers to the nth structure of a plurality of electrical connection structures arranged in a direction perpendicular to the drawing (direction of the rotation axis G).

[0087] In one rotation-compatible region (first conductive surface 10An, second conductive surface 12An) and the other rotation-compatible region (first conductive surface 10Bn, second conductive surface 12Bn), the first conductive surface 10An, Bn and the second conductive surfaces 12An, 12Bn are connected by different rolling members 20, and are electrically connected to different first wirings 40An, 40Bn and second wirings 42An, 42Bn, respectively.

[0088] In other words, in the rotational direction of the first resin member 4 and the second resin member 6, a first electrical connection structure is obtained consisting of the first wiring 40An - first conductive surface 10An - rolling member 20 - second conductive surface 12An - second wiring 42An, and a second electrical connection structure is obtained consisting of the first wiring 40Bn - first conductive surface 10Bn - rolling member 20 - second conductive surface 12Bn - second wiring 42Bn, which is insulated from the first connection structure.

[0089] To obtain such a first and second electrical connection structure, in the example shown in Figure 9, the predetermined angle α, which is the maximum angle at which the first resin member 4 and the second resin member 6 rotate relative to each other, is approximately half that of Figure 7. As a result, the central angle θA of the annular shape that constitutes the rotational region of the second conductive surface 12An, and the central angle θB of the annular shape that constitutes the rotational region of the second conductive surface 12Bn, are both set to be greater than or equal to the predetermined angle α. The central angles θA and θB may be the same or different.

[0090] In the example shown in Figure 9, two electrical connection structures are arranged, but it is possible to further extend the first conductive surface 10n and the second conductive surface 12n in the rotational direction of the first resin member 4 and the second resin member 6, and it is also possible to arrange three or more electrical connection structures. If the predetermined angle α in which the first resin member 4 and the second resin member 6 rotate relative to each other is even smaller, it is possible to arrange even more electrical connection structures depending on the predetermined angle α.

[0091] In the modified version of the third embodiment, since multiple rotation-compatible regions are arranged in an insulated state in the rotation direction, multiple different wiring connections can be realized, and more wiring connections can be made efficiently in a space-saving manner. In particular, combining the third embodiment with the modified version allows for even more wiring connections to be made efficiently in a space-saving manner. If the number of different insulated electrical connection structures in the direction of the rotation axis G in the third embodiment is N, and the number of different insulated electrical connection structures in the rotation direction in the modified version is L, then a large number of N × L different insulated electrical connection structures can be obtained in a space-saving manner.

[0092] (Three-dimensional wiring structure according to the fourth embodiment) Next, a three-dimensional wiring structure according to the fourth embodiment of the present invention will be described with reference to Figures 10 and 11. Figure 10 is a schematic perspective view showing a three-dimensional wiring structure according to the fourth embodiment of the present invention. Figure 11 is a schematic side cross-sectional view showing an example of a convex rail with the first and second conductive surfaces formed on its upper surface. Figure 11 is a cross-sectional view taken from the direction in which the rolling member 20 rolls. Note that in Figure 10, the first resin member 4 and the second resin member 6 are shown separated.

[0093] In the fourth embodiment as well, a rotating shaft region 8 integrally protruding from the second resin member 6 is inserted into a rotating shaft hole 8a provided in the first resin member 4, and the two are connected in a state that they can rotate around the rotating shaft G. However, this is not the only embodiment; for example, rotating shaft holes may be formed in the first resin member 4 and the second resin member 6, and a rotating shaft member of a different component may be inserted. On the other hand, the three-dimensional wiring structure 2 according to the fourth embodiment differs from the third embodiment in the arrangement of the first conductive surface 10n and the second conductive surface 12n. In the third embodiment, the first conductive surface 10n and the second conductive surface 12n were formed on the bottom surface of a groove 14 as shown in Figure 8A, but in the fourth embodiment, the first conductive surface 10n and the second conductive surface 12n are formed on the upper surface of a convex rail 16 as shown in Figure 11.

[0094] In other respects, the three-dimensional wiring structure 2 according to the fourth embodiment is basically the same as that of the third embodiment. Therefore, the structure shown in Figures 7 and 9 is applied in the fourth embodiment as well, and all the effects and benefits of this structure can be enjoyed in the same way. For this reason, the effects and benefits of the three-dimensional wiring structure 2 will not be described repeatedly in the fourth embodiment.

[0095] In this embodiment, as shown in Figure 11, the first conductive surface 10 and the second conductive surface 12 are formed on the upper surface of the convex rail 16. Here, the n-1th, nth, and n+1th rotation-corresponding regions (the first conductive surface 10 and the second conductive surface 12), which are arranged in an insulated manner in the direction of the rotation axis G, are shown with the numbers n-1, n, and n+1.

[0096] The cylindrical rolling member 20 has flanges 22 on both sides that have a larger outer diameter than the central body. As a result, it is guided by the guide surfaces 16a on both sides of the convex rail 16 and the guide surfaces 22a on the inner surfaces of the flanges 22 of the rolling member 20, allowing it to roll smoothly in a stable state. Therefore, the rotational resistance when the first resin member 4 and the second resin member 6 rotate relative to each other can also be reduced.

[0097] In this embodiment as well, the rolling member 20 has guide surfaces 16a and 22a formed so that it rolls along the first conductive surface 10 or the second conductive surface 12. Therefore, the guide surfaces 16a and 22a ensure that the rolling member 20 rolls in contact with the first conductive surface 10n and the second conductive surface 12n.

[0098] In particular, in the fourth embodiment, the rolling member 20 has a cylindrical surface shape with a flange 22, and the first conductive surface 10n or the second conductive surface 12n is positioned on the upper surface of the convex rail 16 formed on the first resin member 4 or the second resin member 6. In this way, the cylindrical surface shape of the rolling member 20 with the flange 22 and the convex rail 16 ensure that guide surfaces 22a and 16a are reliably formed, and the multiple first conductive surfaces 10n and second conductive surfaces 12n are reliably kept in an insulated state.

[0099] (General description) The three-dimensional wiring structure 2 according to any embodiment or modification described above comprises a first resin member 4 and a second resin member 6 connected in a rotatable manner, a first conductive member 30 attached to the first resin member 4 or a first conductive surface 10 formed on the first resin member 4 that is electrically connected to a first wiring 40 formed on the first resin member 4, a second conductive surface 12 formed on the second resin member 6 that is electrically connected to a second wiring 42 formed on the second resin member 6, and at least the surface of the first resin member 4 and the second resin member The first resin member 4 and the second resin member 6 are configured to rotate relative to each other, and include a spherical or cylindrical rolling member 20 that rolls in contact with the first conductive member 30 and the second conductive surface 12, or in contact with the first conductive surface 10 and the second conductive surface 12, thereby electrically connecting the first wiring 40 and the second wiring 42. When the first resin member 4 and the second resin member 6 rotate relative to each other within a predetermined angle α of less than 360 degrees, the rolling member 20 rolls within a rotation-corresponding region which is the region of the first conductive surface 10 or the second conductive surface 12 that corresponds to the predetermined angle α.

[0100] This allows the wiring 40 and 42 of the two resin members 4 and 6, which are fitted with wiring, to be electrically connected without the need to add any additional components such as bearings, when the two resin members 4 and 6 rotate relative to each other within a range of less than 360 degrees. This provides a three-dimensional wiring structure 2 that enables compact and efficient wiring connections.

[0101] Furthermore, in any of the above embodiments and modifications, the three-dimensional wiring structure 2 has a rotation-compatible region that is formed on a plane perpendicular to the rotation axis G of the first resin member 4 and the second resin member 6, and has an annular shape with a central angle of a predetermined angle α or more centered on the rotation axis G, or a cylindrical surface shape with a central angle of a predetermined angle α or more centered on the rotation axis G.

[0102] Thus, since the rotation-compatible region has an annular shape on a plane with a central angle of a predetermined angle α or greater, or a cylindrical surface shape with a central angle of a predetermined angle α or greater, the first wiring 40 and the second wiring 42 can be reliably electrically connected at any rotational position of the first resin member 4 and the second resin member 6.

[0103] Furthermore, in the three-dimensional wiring structure 2 according to any embodiment or modification described above, a plurality of rotation-compatible regions are arranged in a state of mutual isolation in the rotational direction of the first resin member 4 and the second resin member 6, and in each rotation-compatible region in the rotational direction, the first conductive member 30 and the second conductive surface 12 or the first conductive surface 10 and the second conductive surface 12 are connected by different rolling members 20, respectively, to electrically connect different first wiring 40 and second wiring 42.

[0104] As a result, multiple rotation-compatible regions are arranged in an insulated state from each other in the rotational direction of the first resin member 4 and the second resin member 6, enabling multiple different wiring connections and allowing for more wiring connections to be made efficiently in a space-saving manner.

[0105] When forming circuit patterns having the above-described wirings 40, 42, conductive surfaces 10, 12, etc., on resin members 4 and 6, it is preferable to use solder resist (SR) for the formation. This makes it possible to form fine circuit patterns. Furthermore, the solder resist maintains the insulation of the circuit pattern and protects it from dust, heat, moisture, etc., over a long period of time.

[0106] Furthermore, in order to form a circuit pattern having the above-mentioned wiring 40, 42, conductive surfaces 10, 12, etc. on a three-dimensional structure such as resin members 4, 6, for example, a non-conductive metal complex can be dispersed in the molding resin that is the material of the resin members 4, 6, a three-dimensional substrate can be formed using this molding resin, then a laser beam can be irradiated in accordance with the circuit pattern to generate metal nuclei, and then the circuit pattern can be formed by plating.

[0107] While embodiments and modes of implementation of the present invention have been described, the disclosed content may change in the details of the configuration, and changes in the combination and order of elements in the embodiments and modes of implementation can be realized without departing from the claimed scope and spirit of the present invention. [Explanation of Symbols]

[0108] 2 Three-dimensional wiring structure 4. First resin member 6. Second resin component 8 Rotation axis region 8a Rotating shaft hole 10, 10n, 10An~10Dn First conductive surface 12, 12n, 12An~12Dn Second conductive surface 14 grooves 14a Guide surface 16 Convex Rail 16a Guide surface 18 Stopper 20 Rolling members 22 Tsuba 22a Guide surface 30, 30A, 30B First conductive member 32 Springs 34 Screw component 36 Support 40, 40A~40D First wiring 42, 42A~40D Second wiring

Claims

1. A first resin member and a second resin member connected in a rotatable manner, The first wiring formed on the first resin member is electrically connected to the first conductive member attached to the first resin member or the first conductive surface formed on the first resin member, The second wiring formed on the second resin member is electrically connected to the second conductive surface formed on the second resin member, A spherical or cylindrical rolling member having at least a conductive surface, which, when the first resin member and the second resin member rotate relative to each other, rolls in contact with the first conductive member and the second conductive surface, or rolls in contact with the first conductive surface and the second conductive surface, to electrically connect the first wiring and the second wiring; Equipped with, A three-dimensional wiring structure in which, when the first resin member and the second resin member rotate relative to each other within a predetermined angle range of less than 360 degrees, the rolling member rolls within a rotation-compatible region which is a region of the first conductive surface or the second conductive surface corresponding to the predetermined angle.

2. The three-dimensional wiring structure according to claim 1, wherein the rotation-compatible region has an annular shape formed on a plane perpendicular to the rotation axes of the first resin member and the second resin member, having a central angle of a predetermined angle or greater with respect to the rotation axis, or has a cylindrical surface shape having a central angle of a predetermined angle or greater with respect to the rotation axis as its central axis.

3. In the rotational direction of the first resin member and the second resin member, a plurality of the rotation-compatible regions are arranged in a state insulated from each other. The three-dimensional wiring structure according to claim 2, wherein in each of the rotation-corresponding regions in the rotation direction, the first conductive member and the second conductive surface or the first conductive surface and the second conductive surface are connected by different rolling members, thereby electrically connecting different first and second wirings.

4. The rotation-compatible region having the annular shape has a predetermined length in the radial direction when centered on the rotation axis, In the radial direction, a plurality of rotation-compatible regions with different radii are formed in a state insulated from one another. The three-dimensional wiring structure according to claim 3, wherein in each of the rotation-compatible regions in the radial direction, the first conductive member and the second conductive surface or the first conductive surface and the second conductive surface are connected by different rolling members, thereby electrically connecting different first and second wirings.

5. The rotation-compatible region having the cylindrical surface shape has a predetermined length in the direction of the rotation axis, In the direction of the rotation axis, a plurality of the rotation-corresponding regions are formed in a state insulated from each other. The three-dimensional wiring structure according to claim 3, wherein in each of the rotation-corresponding regions in the direction of the rotation axis, the first conductive member and the second conductive surface or the first conductive surface and the second conductive surface are connected by different rolling members, thereby electrically connecting different first and second wirings.

6. The three-dimensional wiring structure according to claim 1, wherein the modulus of elasticity of the rolling member is lower than the modulus of elasticity of the first resin member and the second resin member.

7. The first conductive member comprises a spring having a conductive surface that contacts the rolling member, which is a component of the first conductive member. The three-dimensional wiring structure according to any one of claims 1 to 6, wherein when the rolling member rolls in contact with the first conductive member and the second conductive surface, the rolling member in contact with the spring rolls while being pressed against the second conductive surface by the biasing force of the spring.

8. The three-dimensional wiring structure according to any one of claims 1 to 6, wherein when the rolling member rolls in contact with the first conductive surface and the second conductive surface, the first conductive surface and the second conductive surface are always positioned opposite each other while maintaining a distance equal to the outer diameter of the rolling member.

9. The three-dimensional wiring structure according to any one of claims 1 to 6, wherein the rolling member has a guide surface formed so as to roll along the first conductive surface or the second conductive surface.

10. The three-dimensional wiring structure according to any one of claims 1 to 6, wherein the first conductive surface or the second conductive surface is arranged on the bottom surface of a groove formed in the first resin member or the second resin member.

11. The rolling member has a cylindrical surface shape with a flange, The three-dimensional wiring structure according to any one of claims 1 to 6, wherein the first conductive surface or the second conductive surface is arranged on the upper surface of a convex rail formed on the first resin member or the second resin member.

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