Coaxial connector connection structure

Abstract

To make it possible to obtain stable communication performance even if the connection position of a second coaxial connector relative to a first coaxial connector is misaligned.SOLUTION: A coaxial connector connection structure 28 is a connection structure between a first coaxial connector 40 and a second coaxial connector 70. The first coaxial connector includes a first inner conductor 50, a first outer conductor 60, and a first dielectric 42, and the second coaxial connector includes a second inner conductor 80, a second outer conductor 90, and a second dielectric 72. When, in a connected state of both the coaxial connectors, a portion where the first inner conductor and the second inner conductor overlap in a connection direction is defined as an inner-side overlap portion E1, and a portion where the first outer conductor and the second outer conductor overlap in the connection direction is defined as an outer-side overlap portion E2, both the first dielectric 42 and the second dielectric 72 are positioned to avoid both the inner-side overlap portion and the outer-side overlap portion.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to a connection structure of a coaxial connector. [Background technology]

[0002] Patent Document 1 discloses a connection structure between a coaxial connector and a mating coaxial connector. When both connectors are connected, a movable part of the housing is located between a connecting part of the center contact and a resilient contact piece of the outer contact. Also, when both connectors are connected, an insulator faces the movable part of the housing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-62661 A Summary of the Invention [Problem to be solved by the invention]

[0004] It is considered that the housing movable part and the insulator of Patent Document 1 function as a dielectric between the inner conductor and the outer conductor. Also, in Patent Document 1, it is considered that the shape is designed so as to obtain the desired communication performance, assuming a configuration in which the insulator approaches the housing movable part in the immediate vicinity of the housing movable part.

[0005] However, if the position of the mating coaxial connector is misaligned with respect to the coaxial connector, a large air gap is expected to be formed between the movable housing part and the insulator, which may cause the communication performance of the connection structure between the coaxial connector and the mating coaxial connector to deviate from the design value.

[0006] Therefore, an object of the present disclosure is to provide a method for obtaining stable communication performance even if the connection position of the second coaxial connector relative to the first coaxial connector is misaligned. [Means for solving the problem]

[0007] The coaxial connector connection structure disclosed herein is a coaxial connector connection structure in which a first coaxial connector and a second coaxial connector are connected, wherein the first coaxial connector includes a first inner conductor, a first outer conductor surrounding the outer periphery of the first inner conductor, and a first dielectric located between the first inner conductor and the first outer conductor, and the second coaxial connector includes a second inner conductor, a second outer conductor surrounding the outer periphery of the second inner conductor, and a second dielectric located between the second inner conductor and the second outer conductor, and in a connected state of the first coaxial connector and the second coaxial connector, when a portion where the first inner conductor and the second inner conductor overlap in a connection direction between the first coaxial connector and the second coaxial connector is defined as an inner overlap portion and a portion where the first outer conductor and the second outer conductor overlap in the connection direction is defined as an outer overlap portion, both of the first dielectric and the second dielectric are positioned to avoid both the inner overlap portion and the outer overlap portion in the connection direction. Effect of the Invention

[0008] According to the present disclosure, stable communication performance can be obtained even if the connection position of the second coaxial connector relative to the first coaxial connector is misaligned. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view showing a device according to an embodiment. [Diagram 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Diagram 3] FIG. 3 is a perspective view showing a connection structure of a coaxial connector. [Figure 4] FIG. 4 is an exploded perspective view showing the above connecting structure. [Diagram 5] FIG. 5 is an enlarged cross-sectional view of FIG. [Figure 6] FIG. 6 is a partially cutaway perspective view showing a fixing portion of the first inner conductor to the first dielectric. [Figure 7]FIG. 7 is a perspective view showing another state of the connection structure of the coaxial connector. [Figure 8] FIG. 8 is a perspective view showing still another state of the connection structure of the coaxial connector. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] [Description of the embodiments of the present disclosure] First, the embodiments of the present disclosure will be listed and described.

[0011] The connection structure of the coaxial connector of the present disclosure is as follows.

[0012] (1) A connection structure of a coaxial connector in which a first coaxial connector and a second coaxial connector are connected, wherein the first coaxial connector includes a first inner conductor, a first outer conductor surrounding an outer periphery of the first inner conductor, and a first dielectric located between the first inner conductor and the first outer conductor, and the second coaxial connector includes a second inner conductor, a second outer conductor surrounding an outer periphery of the second inner conductor, and a second dielectric located between the second inner conductor and the second outer conductor, and when, in a connected state of the first coaxial connector and the second coaxial connector, a portion where the first inner conductor and the second inner conductor overlap in a connection direction of the first coaxial connector and the second coaxial connector is defined as an inner overlap portion and a portion where the first outer conductor and the second outer conductor overlap in the connection direction is defined as an outer overlap portion, both of the first dielectric and the second dielectric are positioned to avoid both the inner overlap portion and the outer overlap portion in the connection direction.

[0013] In this case, both the first dielectric and the second dielectric are positioned to avoid both the inner overlapping portion and the outer overlapping portion in the connection direction. Therefore, in the connection structure of the coaxial connector, the first coaxial connector and the second coaxial connector can be designed so as to obtain the desired communication performance on the premise that air is interposed between the inner overlapping portion and the outer overlapping portion. In this case, even if the connection position of the second coaxial connector relative to the first coaxial connector is shifted, only the length of the intervening air portion in the connection direction changes. Compared to the case where each coaxial connector is designed on the assumption that a dielectric is interposed in most of the inner overlapping portion and the outer overlapping portion, stable communication performance can be obtained.

[0014] (2) In the connection structure of the coaxial connector of (1), the first dielectric may be located closer to the base end of each of the first inner conductor and the first outer conductor than both the inner overlapping portion and the outer overlapping portion in the connection direction, and the second dielectric may be located closer to the base end of each of the second inner conductor and the second outer conductor than both the inner overlapping portion and the outer overlapping portion in the connection direction.

[0015] In this case, the first dielectric can maintain a constant positional relationship between the first inner conductor and the first outer conductor closer to the base ends of the first inner conductor and the first outer conductor than both the inner overlapping portion and the outer overlapping portion. The second dielectric can maintain a constant positional relationship between the second inner conductor and the second outer conductor closer to the base ends of the second inner conductor and the second outer conductor than both the inner overlapping portion and the outer overlapping portion. This makes it easier to maintain the coaxial state of the coaxial connector while providing an air layer, and stabilizes communication performance.

[0016] (3) A connection structure of a coaxial connector according to (1) or (2), wherein a maximum allowable length is set for each of the inner overlap portion and the outer overlap portion in the connection direction, and both the first dielectric and the second dielectric may be positioned to avoid both the inner overlap portion and the outer overlap portion when they reach their respective maximum allowable lengths.

[0017] When the second coaxial connector is overconnected to the first coaxial connector within the tolerance range, it is assumed that the inner overlap portion and the outer overlap portion each reach their maximum allowable length. Even in this case, stable communication performance is obtained because air is interposed between the inner overlap portion and the outer overlap portion.

[0018] (4) A connection structure of a coaxial connector described in any one of (1) to (3), wherein the first inner conductor includes a first inner conductor tube portion and a first inner conductor elastic piece protruding from a tip of the first inner conductor tube portion, the second inner conductor includes a second inner conductor tube portion with which the first inner conductor elastic piece elastically contacts, the first dielectric surrounds a base end portion of the first inner conductor tube portion, and the first dielectric may be located on the base end side of the first inner conductor tube portion, away from the tip of the first inner conductor tube portion by more than half the protruding length of the first inner conductor elastic piece in the connection direction.

[0019] In this case, the first dielectric material is likely to be positioned avoiding both the inner overlapping portion and the outer overlapping portion.

[0020] (5) A connection structure of a coaxial connector according to any one of (1) to (4), wherein the second inner conductor includes a second inner conductor tube portion and a second inner conductor extension tube portion, the second outer conductor includes a second outer conductor tube portion and a second outer conductor extension tube portion, the second inner conductor tube portion is a portion connected to the first inner conductor, the second outer conductor tube portion is a portion connected to the first outer conductor, the second outer conductor tube portion is arranged coaxially around the second inner conductor tube portion, and the second dielectric may be arranged between the second inner conductor extension tube portion and the second outer conductor extension tube portion in the connection direction, avoiding a gap between the second inner conductor tube portion and the second outer conductor tube portion.

[0021] In this case, it is easy to dispose air between the inner overlap portion and the outer overlap portion.

[0022] (6) A connection structure of a coaxial connector according to any one of (1) to (4), wherein the first inner conductor includes a first inner conductor tube portion and a first inner conductor elastic piece protruding from a tip of the first inner conductor tube portion, the first outer conductor includes a first outer conductor tube portion and a first outer conductor elastic piece protruding from a tip of the first outer conductor tube portion, the second inner conductor includes a second inner conductor tube portion with which the first inner conductor elastic piece is in elastic contact, the second outer conductor includes a second outer conductor tube portion with which the first outer conductor elastic piece is in elastic contact, the first inner conductor elastic piece may be in elastic contact with an inner circumferential surface of the second inner conductor tube portion, and the first outer conductor elastic piece may be in elastic contact with an outer circumferential surface of the second outer conductor tube portion.

[0023] This prevents an elastic piece from being interposed between the second inner conductor tube portion and the second outer conductor tube portion. This makes it possible to design the communication performance of the coaxial connector connection structure based on the second inner conductor tube portion and the second outer conductor tube portion, making the design easy to perform. Furthermore, since the second inner conductor tube portion and the second outer conductor tube portion are components of the second coaxial connector, it is easy to keep the positional relationship between the second inner conductor tube portion and the second outer conductor tube portion constant. This results in more stable communication performance.

[0024] (7) A connection structure of a coaxial connector according to any one of (1) to (6), wherein the first inner conductor includes a positioning piece that protrudes outward from an outer peripheral surface of a base end of the first inner conductor and extends along a central axis of the first inner conductor, and the first dielectric has an insertion hole into which the base end of the first inner conductor is inserted and a positioning groove into which the positioning piece is fitted, and the first inner conductor is fixed in an inserted state in the first dielectric by fitting the positioning piece into the positioning groove with the base end of the first inner conductor inserted into the insertion hole.

[0025] This causes the first inner conductor to be firmly fixed to the first dielectric.

[0026] (8) In the coaxial connector connection structure of (7), a stopper protrusion that catches on the first dielectric inside the positioning groove may be formed on the protruding end of the positioning piece.

[0027] With this, the retaining projection on the projecting end of the positioning piece catches on the first dielectric inside the positioning groove, making it difficult for the first inner conductor to come off from the first dielectric.

[0028] (9) In the connection structure of a coaxial connector of (7) or (8), a retaining annular protrusion that protrudes annularly toward a tip side of the first inner conductor may be formed in a portion of the first dielectric that surrounds the insertion hole.

[0029] In this case, the first inner conductor can also be held by the retaining annular protrusion, so that the first inner conductor is held more securely.

[0030] (10) A coaxial connector connection structure according to any one of (7) to (9), wherein an outer peripheral portion of the first dielectric on the side of the first outer conductor may be formed with an outer peripheral annular protrusion that protrudes in an annular shape toward a tip side of the first inner conductor.

[0031] In this case, the outer peripheral annular convex portion contacts the first outer conductor, which tends to stabilize the posture of the first outer conductor relative to the first dielectric, thereby stabilizing the positional relationship between the first inner conductor and the first outer conductor, and stabilizing communication performance.

[0032] (11) A connection structure of any one of the coaxial connectors described in (1) to (10), wherein the first coaxial connector is a board-side coaxial connector fixed to a circuit board, and the second coaxial connector may be a relay coaxial connector that relays connection between the first coaxial connector and a third coaxial connector.

[0033] In this way, when the second coaxial connector is an intermediate coaxial connector that intermediates the first coaxial connector and the third coaxial connector, the position of the second coaxial connector relative to the first coaxial connector may vary depending on the positional relationship between the first coaxial connector and the third coaxial connector, and in such a case, stable communication performance can be obtained between the first coaxial connector and the second coaxial connector.

[0034] [Details of the embodiment of the present disclosure] Specific examples of the connection structure of the coaxial connector of the present disclosure will be described below with reference to the drawings. Note that the present disclosure is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope of the claims.

[0035] [Embodiment] Hereinafter, a coaxial connector connection structure according to an embodiment will be described. Fig. 1 is a perspective view showing a device 10 equipped with a coaxial connector connection structure 28. Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1.

[0036] <Overall configuration of the equipment> The device 10 is, for example, a camera device. The camera device is, for example, a device mounted on a vehicle. The device 10 does not have to be a camera device.

[0037] The device 10 includes a case 12, an electric component 20, and an external connection coaxial connector 30. The electric component 20 is accommodated in the case 12. The external connection coaxial connector 30 is a connector for connecting the electric component 20 to an external electric component. For example, the external connection coaxial connector 30 is a connector to which a cable connected to the external electric component is connected.

[0038] The case 12 includes a first case 13 and a second case 14. The first case 13 and the second case 14 are formed of, for example, resin. The first case 13 and the second case 14 are combined to form the rectangular box-shaped case 12 that houses the electric components 20. If the device 10 is a camera device, it is assumed that the first case 13 has a lens or window for capturing images, and the second case 14 has a coaxial connector 30 for external connection.

[0039] More specifically, a holding tube portion 16 is provided to protrude from the bottom 15 of the case 12. The holding tube portion 16 is a cylinder and protrudes outward from the center of the bottom portion 15. The inner opening of the holding tube portion 16 opens into the second case 14, and the outer opening of the holding tube portion 16 opens to the outside of the second case 14. A holding partition portion 17 is formed in the middle of the holding tube portion 16 in the direction along the central axis X. In this embodiment, the holding partition portion 17 is formed in the middle of the holding tube portion 16 in the direction along the central axis X, near the inner opening. The holding partition portion 17 divides the space of the holding tube portion 16 into the space on the inner opening side and the space on the outer opening side. A holding hole 17h is formed in the holding partition portion 17, and the coaxial connector 30 for external connection is inserted and held in the holding hole 17h.

[0040] The coaxial connector 30 for external connection comprises an inner conductor 32 for external connection, a dielectric material 34 for external connection, and an outer conductor 36 for external connection.

[0041] The external connection inner conductor 32 is formed in a long and thin rod shape, and is made of a conductive material such as metal. The external connection inner conductor 32 is an example of a pin-shaped mating inner conductor that is inserted into and connected to a second inner conductor 80 described later. The external connection dielectric 34 is formed of an insulator such as resin, and surrounds the periphery of the external connection inner conductor 32. The external connection outer conductor 36 is formed of a conductive material such as metal. The external connection outer conductor 36 is formed in a cylindrical shape that surrounds the periphery of the external connection dielectric 34. The external connection outer conductor 36 is an example of a mating outer conductor to which the second outer conductor 90 is connected.

[0042] The electric component 20 is, for example, a mounting board on which electronic components are mounted. When the device 10 is a camera device, the electric component 20 is assumed to be a circuit board 21 and an image sensor 22 mounted on the circuit board 21. The image sensor 22 faces an image capturing lens or window in the first case 13, and captures an image of the outside scenery by rotating the lens or window. Hereinafter, the first case 13 side to which the image sensor 22 faces may be referred to as the front side, and the opposite second case 14 side may be referred to as the rear side.

[0043] A coaxial connector connection structure is incorporated in the device 10. The coaxial connector connection structure is a connection structure between a first coaxial connector 40 and a second coaxial connector .

[0044] In this embodiment, the first coaxial connector 40 is provided on the surface of the circuit board 21 opposite to the imaging element 22. The first coaxial connector 40 is an example of a board-side coaxial connector fixed to the circuit board 21.

[0045] The first coaxial connector 40 includes a first inner conductor 50, a first outer conductor 60 surrounding the outer periphery of the first inner conductor 50, and a first dielectric 42 located between the first inner conductor 50 and the first outer conductor 60.

[0046] The first dielectric 42 surrounds the first inner conductor 50. The first dielectric 42 is made of an insulator. The first outer conductor 60 surrounds the first dielectric 42. The base end of the first inner conductor 50 and the base end of the first outer conductor 60 are fixed to the circuit board 21 by soldering or the like. As a result, the first inner conductor 50 and the first outer conductor 60 are electrically connected to the circuit of the circuit board 21 and are fixed in a state protruding from the circuit board 21. The first coaxial connector 40 protrudes from the circuit board 21 toward the coaxial connector 30 for external connection.

[0047] The second coaxial connector 70 is connected to the first coaxial connector 40. The second coaxial connector 70 includes a second inner conductor 80, a second outer conductor 90 surrounding the outer periphery of the second inner conductor 80, and a second dielectric 72 located between the second inner conductor 80 and the second outer conductor 90. The second dielectric 72 surrounds the periphery of the second inner conductor 80. The second dielectric 72 is made of an insulator. The second outer conductor 90 surrounds the periphery of the second dielectric 72. The second coaxial connector 70 is connected to the first coaxial connector 40 with the first inner conductor 50 inserted and connected to the second inner conductor 80 and the second outer conductor 90 inserted and connected to the first outer conductor 60. The second coaxial connector 70 further protrudes from the first coaxial connector 40 toward the coaxial connector 30 for external connection. The second coaxial connector 70 relays and connects the first coaxial connector 40 and the coaxial connector 30 for external connection. The second coaxial connector 70 is connected to the first coaxial connector 40 and the coaxial connector for external connection 30 in a manner that allows its position to be changed.

[0048] The coaxial connector for external connection 30 may be understood as a third coaxial connector, and the second coaxial connector 70 as a relay coaxial connector that relays and connects the first coaxial connector 40 and the third coaxial connector.

[0049] The coaxial connector 30 for external connection is provided on the second case 14 side, i.e., on the rear side of the case 12. Inside the case 12, the second coaxial connector 70 is connected to the coaxial connector 30 for external connection. When an external cable is connected to the coaxial connector 30 for external connection, an external electrical component to which the cable is connected is electrically connected to the electrical component 20 inside the case 12.

[0050] The circuit board 21 is supported at a fixed position within the case 12. In terms of design, the position of the first coaxial connector 40 relative to the coaxial connector for external connection 30 is set at a fixed position. However, there is a possibility that the position of the first coaxial connector 40 relative to the coaxial connector for external connection 30 may deviate from the designed position within a tolerance range.

[0051] In this embodiment, the insertion amount of the second coaxial connector 70 relative to the first coaxial connector 40 is adjustable within a range in which the first inner conductor 50 and the second inner conductor 80 can maintain electrical contact and the first outer conductor 60 and the second outer conductor can maintain electrical contact. The second coaxial connector 70 can be inserted and connected in a tilted state relative to the first coaxial connector 40 and the coaxial connector for external connection 30. As a result, even if the distance of the coaxial connector for external connection 30 relative to the first coaxial connector 40 varies during the assembly work of the device 10 or in the completed state, the distance variation can be absorbed by adjusting the insertion amount of the second coaxial connector 70 relative to the first coaxial connector 40. Even if the coaxial connector for external connection 30 is displaced from the position coaxially facing the first coaxial connector 40, the positional displacement is absorbed by tilting the second coaxial connector 70 relative to the first coaxial connector 40 and the coaxial connector for external connection 30.

[0052] <About the connection structure of coaxial connectors> The coaxial connector connection structure 28 will be described in more detail. Fig. 3 is a perspective view showing the coaxial connector connection structure 28. Fig. 4 is an exploded perspective view showing the same connection structure. Fig. 5 is an enlarged sectional view of Fig. 3. Fig. 6 is a partially cutaway perspective view showing a fixing point of the first inner conductor 50 to the first dielectric 42.

[0053] First, the first coaxial connector 40 and the second coaxial connector 70 will be described in more detail, and then the connection structure 28 will be described in more detail, focusing on the positional relationship between the two coaxial connectors 40, 70.

[0054] <About the first coaxial connector> As described above, the first coaxial connector 40 includes the first inner conductor 50, the first outer conductor 60, and the first dielectric material .

[0055] The first inner conductor 50 is an elongated conductive member. In this embodiment, the first inner conductor 50 is formed by pressing a metal plate. The first inner conductor may also be formed by cutting a metal material.

[0056] More specifically, the first inner conductor 50 includes a first inner conductor tube portion 52 and a first inner conductor elastic piece 56 .

[0057] The first inner conductor tube portion 52 is formed in a tubular shape, more specifically, in a cylindrical shape. The base end portion of the first inner conductor 50 is accommodated and held in the first dielectric 42. In the first coaxial connector 40, the tip end refers to the end to which the second coaxial connector 70 is connected, and the base end refers to the end opposite to the tip end, in this case, the end facing the circuit board 21.

[0058] A positioning piece 53 is formed so as to protrude outward from a circumferential portion at the base end of the first inner conductor tube portion 52. The positioning piece 53 is a plate-shaped portion along the central axis of the first inner conductor tube portion 52, and in this embodiment, is a rectangular plate-shaped portion. The positioning piece 53 is configured by two overlapping plate-shaped portions. In this embodiment, the first inner conductor tube portion 52 is formed by pressing the plate-shaped portions into a tube. A plate-shaped portion protrudes outward from each of two adjacent edge portions at the joint of the tube, and the positioning piece 53 is formed by the two plate-shaped portions overlapping each other.

[0059] A retaining projection 53p that catches on the bottom of the positioning groove 44 of the first dielectric 42 is formed on the protruding end 53e of the positioning piece 53. The retaining projection 53p is formed in a shape that catches on the bottom of the positioning groove 44 so that the first inner conductor tube portion 52 is unlikely to come off the tip side of the first dielectric 42. Here, the retaining projection 53p is formed in a triangular plate shape. The edge of the retaining projection 53p on the tip side of the first inner conductor tube portion 52 is more inclined with respect to the central axis X than the edge of the retaining projection 53p on the base side of the first inner conductor tube portion 52. This makes it easier to press the retaining projection 53p into the base end side of the first inner conductor tube portion 52 with respect to the positioning groove 44, and makes it difficult for the retaining projection 53p to come off the tip side of the first inner conductor tube portion 52. The positioning piece 53 and the retaining projection 53p may be omitted.

[0060] The first inner conductor tube portion 52 may be formed with a locking piece 52a that is hooked onto the inner peripheral surface of the first dielectric 42 when the first inner conductor tube portion 52 is press-fitted into the first dielectric 42. A protruding piece 52b that extends along the main surface of the circuit board 21 and is used for soldering may be provided at the base end of the first inner conductor tube portion 52.

[0061] A first inner conductor elastic piece 56 protrudes from the tip of the first inner conductor tube portion 52. In this embodiment, a plurality of (here, three) first inner conductor elastic pieces 56 extend at intervals in the circumferential direction from the tip of the first inner conductor tube portion 52. Preferably, the multiple first inner conductor elastic pieces 56 are positioned at equal intervals around the central axis X of the first inner conductor tube portion 52.

[0062] The first inner conductor elastic piece 56 includes an inclined portion 56a inclined outward from the tip of the first inner conductor tube portion 52, and a curved portion 56b continuing from the tip of the inclined portion 56a and forming an outwardly convex curved shape.

[0063] When the multiple first inner conductor elastic pieces 56 are inserted into the second inner conductor 80, the inclined portions 56a are elastically deformed inward, and the outward apexes of the curved portions 56b are elastically pressed against the inner circumferential surface of the second inner conductor 80. This keeps the first inner conductor 50 electrically connected to the second inner conductor 80.

[0064] The number of elastic pieces may be two, or four or more.

[0065] The first dielectric 42 is formed into a disk shape from resin or the like. The maximum thickness dimension of the first dielectric 42 is smaller than the length dimension of the first inner conductor cylindrical portion 52. The first dielectric 42 is, for example, a molded resin part.

[0066] An insertion hole 43 into which the base end of the first inner conductor 50, more specifically, the base end of the first inner conductor tube portion 52, is inserted is formed in the center of the first dielectric 42. Also, a positioning groove 44 into which a positioning piece 53 is fitted is formed. The positioning groove 44 is recessed from a portion of the circumferential direction of the insertion hole 43 toward the outer periphery and is formed as a groove extending along the central axis X.

[0067] Then, by inserting the first inner conductor tube portion 52 into the insertion hole 43, the first inner conductor 50 is inserted and held in the first dielectric 42. Preferably, the first inner conductor tube portion 52 is press-fitted into the insertion hole 43 and held therein.

[0068] If the first inner conductor is a machined product, the press-fit structure makes it easy to hold the first inner conductor firmly against the first dielectric. If the first inner conductor 50 is a pressed metal plate product, a positioning piece 53 is fitted into the positioning groove 44 to increase the holding strength. The inner circumferential surface of the positioning groove 44 holds the positioning piece 53, making it easy for the first dielectric 42 to hold the first inner conductor 50 firmly.

[0069] Furthermore, the retaining projection 53p of the positioning piece 53 is caught so as to bite into the bottom of the positioning groove 44, making it difficult for the first inner conductor 50 to come out of the first dielectric 42, and the first inner conductor 50 is held more firmly.

[0070] In addition, a retaining annular protrusion 45 that protrudes annularly toward the tip side of the first inner conductor 50 is formed in a portion of the first dielectric 42 surrounding the insertion hole 43. The retaining annular protrusion 45 retains the first inner conductor tube portion 52, so that the first inner conductor 50 is held more firmly and the first inner conductor 50 is less likely to tilt with respect to the first dielectric 42.

[0071] The outer peripheral surface of the first dielectric 42 is formed in a short cylindrical shape that can be inserted into the inner peripheral portion of the first outer conductor 60. An outer peripheral portion of the first dielectric 42 on the first outer conductor 60 side is formed with an outer peripheral annular protrusion 46 that protrudes in an annular shape toward the tip side of the first inner conductor 50. The outer peripheral surface of the first dielectric 42 is formed wide in the direction of the central axis X by the outer peripheral annular protrusion 46. Therefore, the outer peripheral surface of the first dielectric 42 can face the inner peripheral surface of the first outer conductor 60 over a wide area. This makes it easy for the first dielectric 42 to be firmly held relative to the first outer conductor 60, and makes it difficult for the first outer conductor 60 to tilt relative to the first dielectric 42. This makes it easy for the first inner conductor 50 and the first outer conductor 60 to be kept in a coaxial positional relationship.

[0072] The first outer conductor 60 is made of a conductive material such as metal, and surrounds the first dielectric 42. Therefore, the first dielectric 42 is a cylindrical member interposed between the first inner conductor 50 and the first outer conductor 60. The first outer conductor 60 is formed, for example, by pressing a metal plate.

[0073] In this embodiment, the first outer conductor 60 includes a first outer conductor tubular portion 62 and a first outer conductor elastic piece 66 protruding from the tip of the first outer conductor tubular portion 62 .

[0074] The first outer conductor tubular portion 62 is formed in a tubular shape, more specifically, a cylindrical shape, inside which the first dielectric 42 can be placed. The first dielectric 42 is accommodated and held in a base end portion of the first outer conductor tubular portion 62.

[0075] The first outer conductor tube portion 62 may be formed with a locking piece 62a that is hooked onto the outer circumferential surface of the first dielectric 42 when the first dielectric 42 is press-fitted.

[0076] A first outer conductor elastic piece 66 protrudes from the tip of the first outer conductor tubular portion 62. In this embodiment, a plurality of (eight in this embodiment) first outer conductor elastic pieces 66 extend at intervals in the circumferential direction from the tip of the first outer conductor tubular portion 62. Preferably, the multiple first outer conductor elastic pieces 66 are positioned at equal intervals around the central axis X of the first outer conductor tubular portion 62.

[0077] The first outer conductor elastic piece 66 includes an inclined portion 66a inclined inwardly from the tip of the first outer conductor tubular portion 62, and a curved portion 66b continuing from the tip of the inclined portion 66a and forming an inwardly convex curved shape.

[0078] When the multiple first outer conductor elastic pieces 66 are fitted onto the second outer conductor 90, the inclined portions 66a are elastically deformed outward, while the inward apexes of the curved portions 66b are elastically pressed against the outer circumferential surface of the second outer conductor 90. This keeps the first outer conductor 60 electrically connected to the second outer conductor 90.

[0079] The number of elastic pieces may be seven or less, or nine or more.

[0080] In the direction of the central axis X, the length of the first outer conductor tube portion 62 is greater than the thickness of the first dielectric 42. In this embodiment, the length of the first outer conductor tube portion 62 is greater than the length of the first inner conductor 50. The base end of the first outer conductor elastic piece 66 is located farther away from the first dielectric 42 than the base end of the first inner conductor elastic piece 56. The tip of the first outer conductor elastic piece 66 is located farther away from the first dielectric 42 than the tip of the first inner conductor elastic piece 56. However, the curved portions 56b, 66b can contact the second inner conductor 80 or the second outer conductor 90 at the same position in the central axis X.

[0081] The first coaxial connector 40 may be surrounded by a cylindrical connector holder 41. The connector holder 41 is a member formed of resin or the like, and serves to surround the first coaxial connector 40 and prevent it from coming into contact with other members.

[0082] <About the second coaxial connector> As described above, the second coaxial connector 70 includes the second inner conductor 80, the second outer conductor 90, and the second dielectric material 72.

[0083] The second inner conductor 80 is an elongated conductive member. In this embodiment, the second inner conductor 80 is formed by pressing a metal plate. More specifically, the second inner conductor 80 includes a second inner conductor tubular portion 82 and a second inner conductor extension tubular portion 86.

[0084] The second inner conductor tube portion 82 is formed in a tubular shape, more specifically, in a cylindrical shape. An open end of the second inner conductor tube portion 82 faces the first coaxial connector 40. The second inner conductor tube portion 82 is a portion that is connected to the first inner conductor 50.

[0085] More specifically, the second inner conductor tube portion 82 is a thin tube that is elongated along the central axis X. The inner diameter of the second inner conductor tube portion 82 is smaller than the outer diameter of an imaginary circle that connects the tops of the multiple first inner conductor elastic pieces 56. The multiple first inner conductor elastic pieces 56 can elastically contact the inner circumferential surface of the second inner conductor tube portion 82 while elastically deforming inward.

[0086] In the direction of the central axis X, the second inner conductor tube portion 82 is longer than the first inner conductor elastic piece 56. In the direction of the central axis X, the first inner conductor 50 and the second inner conductor 80 can be connected by the apex of the curved portion 56b of the first inner conductor elastic piece 56 coming into contact with any position on the inner circumferential surface of the second inner conductor tube portion 82. This makes it possible to accommodate misalignment between the first inner conductor 50 and the second inner conductor 80 in the direction of the central axis X.

[0087] The second inner conductor extension tubular portion 86 is located on the opposite side to the first coaxial connector 40 with respect to the second inner conductor tubular portion 82. In this embodiment, the second inner conductor extension tubular portion 86 is thinner than the second inner conductor tubular portion 82. The second inner conductor extension tubular portion 86 is connected to the second inner conductor tubular portion 82 via a tapered portion 81. The tapered portion 81 is a tapered portion that gradually becomes thinner from the second inner conductor tubular portion 82 toward the second inner conductor extension tubular portion 86. The second inner conductor extension tubular portion may be connected to the second inner conductor tubular portion via a step portion.

[0088] The second inner conductor extension tubular portion 86 may have an elastic piece 87 protruding toward the tip side. The elastic piece 87 is configured to be elastically deformable in the inward and outward directions. The external connection inner conductor 32 is inserted between the two elastic pieces 87 from the tip side of the two elastic pieces 87. When the external connection inner conductor 32 is sandwiched between the two elastic pieces 87, the second inner conductor 80 is connected to the external connection inner conductor 32.

[0089] The second inner conductor extension tubular portion 86 may be formed with a partial locking piece 86 a that can be locked to the second dielectric 72 .

[0090] The second dielectric 72 is made of resin etc. The second dielectric 72 is, for example, a molded resin part.

[0091] The second dielectric 72 is formed in a tubular shape capable of accommodating at least a portion of the second inner conductor 80. In this embodiment, the second dielectric 72 is formed in a cylindrical shape. A second inner conductor extension tubular portion 86 is accommodated within the second dielectric 72. The internal space of the second inner conductor extension tubular portion 86 is formed large enough to hold the base end of the second inner conductor extension tubular portion 86 in a pressed-in state and to allow elastic deformation of the elastic piece 87 in the inward and outward directions.

[0092] One end of the second dielectric 72 contacts the tapered portion 81, thereby allowing the second dielectric 72 to be positioned relative to the second inner conductor 80. The second inner conductor tube portion 82 extends further toward the first coaxial connector 40 than the second dielectric 72.

[0093] The second outer conductor 90 is disposed on the outer periphery of the second dielectric 72. The second outer conductor 90 is formed of a conductive material such as a metal, and surrounds the second dielectric 72. The second outer conductor 90 is formed, for example, by pressing a metal plate.

[0094] The second outer conductor 90 includes a second outer conductor tubular portion 92 and a second outer conductor extension tubular portion 96 .

[0095] The second outer conductor tubular portion 92 is formed in a tubular shape, more specifically, in a cylindrical shape. An open end of the second outer conductor tubular portion 92 faces the first coaxial connector 40. The second outer conductor tubular portion 92 is a portion that is connected to the first outer conductor 60.

[0096] The second outer conductor tubular portion 92 is located on the outer circumferential side of the second inner conductor tubular portion 82 with a gap therebetween. The outer diameter of the second outer conductor tubular portion 92 is larger than the outer diameter of an imaginary circle connecting the tops of the multiple first outer conductor elastic pieces 66. The multiple first outer conductor elastic pieces 66 can elastically contact the outer circumferential surface of the second outer conductor tubular portion 92 while elastically deforming outward.

[0097] In the direction of the central axis X, the second outer conductor tube portion 92 is longer than the first outer conductor elastic piece 66. In the direction of the central axis X, the first outer conductor 60 and the second outer conductor 90 can be connected by the apex of the curved portion 66b of the first outer conductor elastic piece 66 coming into contact with any position on the outer circumferential surface of the second outer conductor tube portion 92. This makes it possible to accommodate misalignment between the first outer conductor 60 and the second outer conductor 90 in the direction of the central axis X.

[0098] The second outer conductor extension tubular portion 96 is located on the opposite side to the first coaxial connector 40 with respect to the second outer conductor tubular portion 92. In this embodiment, the second outer conductor extension tubular portion 96 is thinner than the second outer conductor tubular portion 92. The second outer conductor extension tubular portion 96 is connected to the second outer conductor tubular portion 92 via a tapered portion 91. The tapered portion 91 is a tapered portion that gradually becomes thinner from the second outer conductor tubular portion 92 toward the second outer conductor extension tubular portion 96. The second outer conductor extension tubular portion may be connected to the second outer conductor tubular portion via a step portion.

[0099] The second outer conductor extension tube portion 96 may have an elastic piece 97 protruding toward the tip side. The elastic piece 97 is configured to be elastically deformable in the inward and outward directions. The external connection outer conductor 36 is fitted onto the outer periphery of the multiple elastic pieces 97 from the tip side of the multiple elastic pieces 97. The multiple elastic pieces 97 are elastically pressed against the inner peripheral surface of the external connection outer conductor 36, whereby the second outer conductor 90 is connected to the external connection outer conductor 36.

[0100] The second outer conductor extension tubular portion 96 may be formed with a partial locking piece 96 a that can be locked to the second dielectric 72 .

[0101] <Connection structure> The positions of the first dielectric 42 and the second dielectric 72 will be described assuming that the first coaxial connector 40 and the second coaxial connector 70 are connected to each other.

[0102] Let us consider a connected state between the first coaxial connector 40 and the second coaxial connector 70. Here, it is assumed that the first coaxial connector 40 and the coaxial connector for external connection 30 are spaced apart by a distance L1 (see FIG. 5).

[0103] The connection direction between the first coaxial connector 40 and the second coaxial connector 70 is along the central axis X of the first coaxial connector 40 and the second coaxial connector 70. In the direction of the central axis X, a portion where the first inner conductor 50 and the second inner conductor 80 overlap is defined as an inner overlap portion E1 (see FIG. 5). In the direction of the central axis X, a portion where the first outer conductor 60 and the second outer conductor 90 overlap is defined as an outer overlap portion E2 (see FIG. 5).

[0104] Both the first dielectric 42 and the second dielectric 72 are positioned to avoid both the inner overlapping portion E1 and the outer overlapping portion E2 in the connection direction. Preferably, the first dielectric 42 is positioned closer to the base ends of the first inner conductor 50 and the first outer conductor 60 than both the inner overlapping portion E1 and the outer overlapping portion E2. Also, preferably, the second dielectric 72 is positioned closer to the base ends of the second inner conductor 80 and the second outer conductor 90 than both the inner overlapping portion E1 and the outer overlapping portion E2.

[0105] In this case, in the inner overlapping portion E1, the conductor located on the outermost side is the second inner conductor tube portion 82 of the second inner conductor 80. In the outer overlapping portion E2, the conductor located on the innermost side is the second outer conductor tube portion 92 of the second outer conductor 90. In the annular space between the second inner conductor tube portion 82 and the second outer conductor tube portion 92, the first dielectric 42 and the second dielectric 72 are not interposed, but an air layer is interposed. For this reason, when designing the connection structure 28 of the coaxial connector, the inner overlapping portion E1 and the outer overlapping portion E2 can be designed so that desired communication performance is obtained on the premise that an air layer is interposed.

[0106] Moreover, the first inner conductor 50 having the first inner conductor elastic piece 56 is located inside the second inner conductor tube portion 82, and the first outer conductor 60 having the first outer conductor elastic piece 66 is located outside the second outer conductor tube portion 92. For this reason, when designing the connection structure 28 of the coaxial connector, the inner overlapping portion E1 and the outer overlapping portion E2 can be designed so as to obtain the desired communication performance based on the outer diameter of the second inner conductor tube portion 82 in which the same diameter portion is continuous and the outer diameter of the second outer conductor tube portion 92 in which the same diameter portion is continuous. This makes the design easier than when designing based on the assumption of the presence of a complex elastic piece shape.

[0107] As described above, the distance L1 between the first coaxial connector 40 and the coaxial connector for external connection 30 may vary within the tolerance range.

[0108] FIG. 7 shows a cross-sectional view in which the distance between the first coaxial connector 40 and the coaxial connector for external connection 30 is the largest within the tolerance range, that is, a distance Lmax.

[0109] In this case, the distance between the second inner conductor 80 and the first dielectric 42 increases, and the distance between the second outer conductor 90 and the first dielectric 42 also increases. This increases the area in which an air layer is present between the inner and outer conductors in the connection structure 28. However, the first coaxial connector 40 and the second coaxial connector 70 are designed on the premise that an air layer is present between the inner overlapping portion E1 and the outer overlapping portion E2. This makes it difficult for the communication performance to be affected even if the air layer increases proportionally.

[0110] On the other hand, if a dielectric is arranged between the inner overlapping portion E1 and the outer overlapping portion E2, each connector is considered to be designed to obtain the desired communication performance assuming the presence of the dielectric. If an air layer is generated due to misalignment of the connectors under such a design, it may have a large effect on the communication performance.

[0111] In this embodiment, the design is performed on the assumption that an air layer is present between the inner overlapping portion E1 and the outer overlapping portion E2, so that even if the air layer increases, the communication performance is unlikely to be affected. In the region where the first dielectric 42 and the second dielectric 72 are provided and away from the inner overlapping portion E1 and the outer overlapping portion E2, the diameters of each part are designed so that appropriate communication performance can be obtained based on the dielectric constants of the first dielectric 42 and the second dielectric 72.

[0112] FIG. 8 shows a cross-sectional view in which the distance between the first coaxial connector 40 and the external coaxial connector 30 is the smallest within the tolerance range, being the distance Lmin.

[0113] In this state, the length of the inner overlapping portion E1 is the maximum allowable length LE1max, and the length of the outer overlapping portion E2 is the maximum allowable length LE2max in the direction of the central axis X. To enable this state to be established, the first dielectric 42 and the second dielectric 72 are positioned to avoid both the inner overlapping portion E1 and the outer overlapping portion E2 that have the maximum allowable lengths LE1max and LE2max.

[0114] In order to ensure an air layer between the inner overlapping portion E1 and the outer overlapping portion E2 and to enlarge the air layer, it is preferable that the first dielectric 42 is positioned from the tip of the first inner conductor tube portion 52 to its base end, at a distance of more than half the protruding length N of the first inner conductor elastic piece 56 in the direction of the central axis X.

[0115] <Effects, etc.> According to the coaxial connector connection structure 28 configured in this manner, both the first dielectric 42 and the second dielectric 72 are positioned to avoid both the inner overlapping portion E1 and the outer overlapping portion E2. Therefore, the first coaxial connector 40 and the second coaxial connector 70 can be designed so as to obtain desired communication performance on the assumption that air is interposed between the inner overlapping portion E1 and the outer overlapping portion E2. In this case, even if the connection position of the second coaxial connector 70 relative to the first coaxial connector 40 deviates from a predetermined position, only the length of the air interposed portion in the connection direction varies. Compared to a case in which each coaxial connector is designed on the assumption that a dielectric is interposed in most parts between the inner overlapping portion E1 and the outer overlapping portion E2, stable communication performance can be obtained.

[0116] Furthermore, the first dielectric 42 can maintain a constant positional relationship between the first inner conductor 50 and the first outer conductor 60 at a position closer to the base ends of the first inner conductor 50 and the first outer conductor 60 than both the inner overlapping portion E1 and the outer overlapping portion E2. The second dielectric 72 can maintain a constant positional relationship between the second inner conductor 80 and the second outer conductor 90 at a position closer to the base ends of the second inner conductor 80 and the second outer conductor 90 than both the inner overlapping portion E1 and the outer overlapping portion E2. This makes it easy to obtain stable communication performance while maintaining a coaxial structure in the connection structure.

[0117] Furthermore, when the second coaxial connector 70 is overconnected within the tolerance range relative to the first coaxial connector 40, it is assumed that the inner overlap portion E1 and the outer overlap portion E2 will have the maximum allowable lengths LE1max and LE2max. Even in this case, a connection with air between the inner overlap portion E1 and the outer overlap portion E2 is realized, and stable communication performance is obtained.

[0118] Furthermore, since the first dielectric 42 is positioned from the tip of the first inner conductor tube portion 52 to its base end, at a distance of more than half the protruding length N of the first inner conductor elastic piece 56 in the direction of the central axis X, the first dielectric 42 is likely to be positioned avoiding the inner overlapping portion E1 and the outer overlapping portion E2.

[0119] Furthermore, since the second dielectric 72 is positioned between the second inner conductor tube portion 82 and the second outer conductor tube portion 92 and between the second inner conductor extension tube portion 86 and the second outer conductor extension tube portion 96, it is easy to position air between the inner overlap portion E1 and the outer overlap portion E2.

[0120] Also, the first inner conductor elastic piece 56 elastically contacts the inner peripheral surface of the second inner conductor tube portion 82, and the first outer conductor elastic piece 66 elastically contacts the outer peripheral surface of the second outer conductor tube portion 92. This prevents the elastic pieces 56, 66 from being interposed between the second inner conductor tube portion 82 and the second outer conductor tube portion 92. This allows the communication performance of the coaxial connector connection structure 28 to be designed based on the second inner conductor tube portion 82 and the second outer conductor tube portion 92, which are easy to simplify in shape, and this design can be easily performed. For example, the second inner conductor tube portion 82 and the second outer conductor tube portion 92 can be made cylindrical in their entirety. Furthermore, since the second inner conductor tube portion 82 and the second outer conductor tube portion 92 are components of the second coaxial connector 70, it is easy to keep the positional relationship between the second inner conductor tube portion 82 and the second outer conductor tube portion 92 constant. This allows more stable communication performance to be obtained.

[0121] Furthermore, with the base end of the first inner conductor tube portion 52 of the first inner conductor 50 inserted into the insertion hole 43 of the first dielectric 42, the positioning piece 53 is fitted into the positioning groove 44, whereby the first inner conductor 50 is fixed in an inserted state in the first dielectric 42. As a result, the first inner conductor tube portion 52 is firmly fixed to the first dielectric 42.

[0122] For example, even when the first inner conductor 50 is formed by pressing a metal plate, the first inner conductor 50 can be easily held firmly by the first dielectric 42. Forming the first inner conductor 50 by pressing can reduce costs compared to forming it by cutting.

[0123] In addition, the retaining projection 53p at the protruding end of the positioning piece 53 is caught on the bottom of the positioning groove 44, making it difficult for the first inner conductor 50 to come out of the first dielectric .

[0124] In addition, since a retaining annular protrusion 45 is formed in the portion of the first dielectric 42 surrounding the insertion hole 43, even if the first dielectric 42 is formed away from the overlapping portions E1, E2 and becomes thin, it is easy to firmly hold the first inner conductor 50.

[0125] Furthermore, since the outer peripheral annular protrusion 46 of the first dielectric 42 comes into contact with the first outer conductor 60, the posture of the first outer conductor 60 is likely to be stable with respect to the first dielectric 42. This makes the positional relationship between the first inner conductor 50 and the first outer conductor 60 stable, and thus makes it easy to stabilize communication performance.

[0126] Moreover, the first coaxial connector 40 is a board-side coaxial connector, and the second coaxial connector 70 is a relay coaxial connector that relays the first coaxial connector 40 as a board-side coaxial connector and the coaxial connector for external connection 30. In this case, the position of the second coaxial connector 70 relative to the first coaxial connector 40 may vary due to a positional deviation of the circuit board 21 relative to the coaxial connector for external connection 30. In such a case, stable communication performance can be obtained between the first coaxial connector 40 and the second coaxial connector 70.

[0127] The configurations described in the above embodiment and modifications can be combined as appropriate as long as they are not mutually inconsistent. [Explanation of symbols]

[0128] 10 equipment 12 cases 13 Case 1 14 Case 2 15 Bottom 16 Holding cylinder part 17 Retaining partition 17h holding hole 20 Electrical Components 21 Circuit Board 22 Image sensor 28 Connection structure 30 Coaxial connector for external connection (third coaxial connector) 32 Inner conductor for external connection 34 External connection dielectric 36 Outer conductor for external connection 40 First coaxial connector (coaxial connector on board side) 41 Connector holder 42 First Dielectric 43 Insertion hole 44 Positioning groove 45 Retaining annular protrusion 46 Outer peripheral ring-shaped protrusion 50 First inner conductor 52 First inner conductor tube 52a Locking piece 52b Projecting piece 53 Positioning piece 53e Protruding end 53p Stopper protrusion 56 First inner conductor elastic piece 56a Slope 56b Curved section 60 First outer conductor 62 First outer conductor tube 62a Locking piece 66 First outer conductor elastic piece 66a Slope 66b Curved section 70 Second coaxial connector (relay coaxial connector) 72 Second Dielectric 80 Second inner conductor 81 Tapered section 82 Second inner conductor tube 86 Second inner conductor extension tube 86a Locking piece 87 Elastic Piece 90 Second outer conductor 91 Tapered section 92 Second outer conductor tube 96 Second outer conductor extension tube 96a Locking piece 97 Elastic Piece E1 inner overlap part E2 Outer overlap part LE1max, LE2max Maximum allowable length X center axis

Claims

1. A coaxial connector connection structure in which a first coaxial connector and a second coaxial connector are connected, the first coaxial connector includes a first inner conductor, a first outer conductor surrounding an outer periphery of the first inner conductor, and a first dielectric located between the first inner conductor and the first outer conductor, the second coaxial connector includes a second inner conductor, a second outer conductor surrounding an outer periphery of the second inner conductor, and a second dielectric located between the second inner conductor and the second outer conductor, When a portion where the first inner conductor and the second inner conductor overlap in a connection direction of the first coaxial connector and the second coaxial connector in a connected state of the first coaxial connector and the second coaxial connector is defined as an inner overlap portion, and a portion where the first outer conductor and the second outer conductor overlap in the connection direction is defined as an outer overlap portion, A connection structure of a coaxial connector, wherein both the first dielectric and the second dielectric are positioned to avoid both the inner overlapping portion and the outer overlapping portion in the connection direction.

2. 2. The coaxial connector connection structure according to claim 1, the first dielectric is located closer to a base end of each of the first inner conductor and the first outer conductor than both the inner overlapping portion and the outer overlapping portion in the connecting direction; A connection structure of a coaxial connector, wherein the second dielectric is located closer to the base ends of the second inner conductor and the second outer conductor than both the inner overlapping portion and the outer overlapping portion in the connection direction.

3. 3. The coaxial connector connection structure according to claim 1, a permissible maximum length is set for each of the inner overlap portion and the outer overlap portion in the connection direction, A connection structure of a coaxial connector, wherein both the first dielectric and the second dielectric are positioned to avoid both the inner overlap portion and the outer overlap portion when each of the first and second dielectrics has reached the maximum allowable length.

4. 3. The coaxial connector connection structure according to claim 1, the first inner conductor includes a first inner conductor tubular portion and a first inner conductor elastic piece protruding from a tip end of the first inner conductor tubular portion, the second inner conductor includes a second inner conductor tube portion with which the first inner conductor elastic piece elastically contacts, the first dielectric surrounds a base end portion of the first inner conductor tube portion, A connection structure of a coaxial connector, wherein the first dielectric is located on the base end side of the first inner conductor tube portion, away from the tip of the first inner conductor tube portion in the connection direction by more than half the protruding length of the first inner conductor elastic piece.

5. 3. The coaxial connector connection structure according to claim 1, the second inner conductor includes a second inner conductor tubular portion and a second inner conductor extension tubular portion, the second outer conductor includes a second outer conductor tubular portion and a second outer conductor extension tubular portion, the second inner conductor tube portion is a portion connected to the first inner conductor, the second outer conductor tube portion is a portion connected to the first outer conductor, the second outer conductor tube portion is disposed coaxially around the second inner conductor tube portion, a second dielectric member disposed between the second inner conductor extension tube portion and the second outer conductor extension tube portion in the connection direction, avoiding a space between the second inner conductor tube portion and the second outer conductor tube portion.

6. 3. The coaxial connector connection structure according to claim 1, the first inner conductor includes a first inner conductor tubular portion and a first inner conductor elastic piece protruding from a tip end of the first inner conductor tubular portion, the first outer conductor includes a first outer conductor tubular portion and a first outer conductor elastic piece protruding from a tip end of the first outer conductor tubular portion, the second inner conductor includes a second inner conductor tube portion with which the first inner conductor elastic piece elastically contacts, the second outer conductor includes a second outer conductor tube portion with which the first outer conductor elastic piece elastically contacts, the first inner conductor elastic piece elastically contacts an inner circumferential surface of the second inner conductor tube portion, A connection structure of a coaxial connector, wherein the first outer conductor elastic piece elastically contacts an outer peripheral surface of the second outer conductor tube portion.

7. 3. The coaxial connector connection structure according to claim 1, the first inner conductor includes a positioning piece that protrudes from an outer circumferential surface of a base end of the first inner conductor toward an outer periphery and extends along a central axis of the first inner conductor, the first dielectric body is formed with an insertion hole into which the base end of the first inner conductor is inserted and a positioning groove into which the positioning piece is fitted, A connection structure of a coaxial connector, in which the base end of the first inner conductor is inserted into the insertion hole and the positioning piece is fitted into the positioning groove, thereby fixing the first inner conductor in an inserted state into the first dielectric.

8. 8. The coaxial connector connection structure according to claim 7, A coaxial connector connection structure, wherein a retaining protrusion that catches on the first dielectric inside the positioning groove is formed on the protruding end of the positioning piece.

9. 8. The coaxial connector connection structure according to claim 7, A connection structure for a coaxial connector, wherein a retaining annular protrusion that protrudes annularly toward the tip side of the first inner conductor is formed on a portion of the first dielectric that surrounds the insertion hole.

10. 8. The coaxial connector connection structure according to claim 7, A connection structure of a coaxial connector, wherein an outer peripheral portion of the first dielectric on the side of the first outer conductor has an outer annular convex portion that protrudes in an annular shape toward the tip side of the first inner conductor.

11. 3. The coaxial connector connection structure according to claim 1, the first coaxial connector is a board-side coaxial connector fixed to a circuit board, The second coaxial connector is a relay coaxial connector that relays and connects the first coaxial connector and a third coaxial connector.

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