JP5251551B2 - Cable connector - Google Patents

Description

  The present invention relates to a cable connector. In particular, the present invention relates to a cable connector having a conductor made of a material that easily undergoes creep deformation.

  Conventionally, a coaxial cable having an inner conductor and an outer conductor made of a copper tube in which concavities and convexities of concentric rings are formed at the same pitch in the longitudinal direction, a cable guide for holding the coaxial cable, and a screw guide connected to the cable guide The cable guide has an external contact that is movable in the axial direction of the coaxial cable by fixing the end of the coaxial cable from the outer periphery, and the conversion portion is an outer conductor of the coaxial cable. A coaxial cable connector having a bushing including a tapered portion connected to an end portion and having an O-ring between the outer sheath of the coaxial cable and the inner surface of the cable guide is known (for example, see Patent Document 1). .

  Since the coaxial cable connector described in Patent Document 1 has a three-point configuration including a cable guide portion, a conversion portion, and an O-ring, it simplifies the process of attaching the connector and prevents assembly errors and component loss. In addition, a waterproof function can be exhibited by the O-ring, and a special tool for tapering the outer conductor end of the coaxial cable can be eliminated.

JP 2003-86309 A

  However, the coaxial cable connector described in Patent Document 1 presses the outer conductor with the outer contact in order to connect the end of the outer conductor and the tapered portion of the bushing. The shape may change.

  Accordingly, an object of the present invention is to provide a cable connector that can ensure electrical connection between the coaxial cable and the cable connector even when a material that easily generates creep is used as the material constituting the coaxial cable. It is in.

In order to achieve the above object, the present invention provides a guide for holding a coaxial cable having an inner conductor, an insulator provided on the outer periphery of the inner conductor, and an outer conductor provided on the outer periphery of the insulator so as to include irregularities, A shell having a collar mated with the guide and electrically contacting the outer conductor of the coaxial cable, the outer conductor being formed of aluminum, the collar being in electrical contact with the outer conductor and the guide look including a projection on the surface side, the outer conductor has an outer conductor inclined surface inclined relative to insertion direction to guide the shell, the color is inclined relative to insertion direction to guide the shell, external A clad having a collar inclined surface that is in electrical contact with the conductor inclined surface and includes a projection on the surface on the guide side, and further has a shape corresponding to the shape of the concave portion of the outer conductor and an inclined surface corresponding to the outer conductor inclined surface. And flop, is provided between the guide and the coaxial cable, cable connector is provided with an elastic member for pressing the outer conductor inclined surface presses the clamping by the elastic force to the collar inclined surface.

  In the cable connector, the outer conductor inclined surface and the collar inclined surface may be inclined in a direction perpendicular to the insertion / extraction direction.

In the cable connector, the elastic member may be made of a metal material and formed in a substantially cylindrical shape having a notch along the longitudinal direction. Further, in the cable connector, the elastic member has a plurality of cutouts, and the plurality of cutouts are respectively halfway from one end or the other end of the substantially cylindrical shape toward the other end or the one end. It may be formed by making a cut .

  In the cable connector, the collar inclined surface may have a coating layer that covers the protrusion and is formed of a material different from the material constituting the external conductor.

  The cable connector may further include a packing provided between the guide and the shell and between the guide and the coaxial cable.

  The cable connector according to the present invention provides a cable connector that can ensure electrical connection between the coaxial cable and the cable connector even when a material that easily generates creep is used as the material constituting the coaxial cable. it can.

It is a structure figure of the coaxial cable used for the cable connector which concerns on the 1st Embodiment of this invention. It is a schematic diagram of the cable connector which concerns on the 1st Embodiment of this invention. In the cable connector which concerns on the 1st Embodiment of this invention, it is a schematic diagram of the state which the outer conductor inclined surface and the collar inclined surface are contacting. (A) is a perspective view of the collar which concerns on the 1st Embodiment of this invention, (b) is a schematic diagram of the partial expanded cross section of a color inclined surface. (A) is a figure which shows an example of the compensation ring which concerns on the 1st Embodiment of this invention, (b) shows the other example of the compensation ring which concerns on the 1st Embodiment of this invention. FIG. It is a schematic diagram of the cable connector which concerns on the 2nd Embodiment of this invention. (A) is a perspective view of the collar which concerns on the 2nd Embodiment of this invention, (b) is a schematic diagram of the partial expanded cross section of a color inclined surface. It is a figure which shows an example of the compensation ring which concerns on the 2nd Embodiment of this invention.

[First Embodiment]
FIG. 1 shows the structure of a coaxial cable used in the cable connector according to the first embodiment of the present invention, and FIG. 2 shows an outline of the cable connector according to the first embodiment of the present invention.

(Outline of configuration of coaxial cable 2)
The coaxial cable 2 according to the first embodiment includes an internal conductor 20 made of a metal material such as copper, an internal insulator 22 made of an insulating material and provided as an insulator provided on the outer periphery of the internal conductor 20, and an internal insulation. The outer conductor 24 is provided on the outer periphery of the body 22 so as to include irregularities.

(Inner conductor 20 and inner insulator 22)
The inner conductor 20 is located substantially at the center of the cross section in the cross section of the coaxial cable 2. The inner conductor 20 propagates a signal through a central conductor (not shown) included in the shell 30. The inner conductor 20 is formed from a wire rod or copper tube made of one or more annealed copper or the like. In addition, the plating layer for antioxidant can also be given to the surface of the wire which comprises the internal conductor 20. FIG. The internal insulator 22 is provided so as to cover the outer periphery of the internal conductor 20. The internal insulator 22 is formed from an electrically insulating material, for example, an insulating resin material.

(Outer conductor 24)
The outer conductor 24 is formed having a convex portion 24a and a concave portion 24b on the outer surface. That is, the outer conductor 24 is formed of a corrugated ridge having a wave shape formed on its outer surface. Further, the convex portion 24 a and the concave portion 24 b are formed at intervals in the longitudinal direction of the coaxial cable 2. For example, the convex portions 24 a and the concave portions 24 b are formed at substantially equal intervals in the longitudinal direction of the coaxial cable 2. Further, the outer conductor 24 is formed of a metal material that is lighter than a metal material such as copper, is excellent in flexibility, and easily generates creep. For example, the outer conductor 24 is made of aluminum that is easily creep-deformed.

  Further, the outer conductor 24 has an outer conductor inclined surface 24 c that is inclined with respect to the insertion / extraction direction of the guide 10 with respect to the shell 30 at the end thereof. For example, the outer conductor 24 has an outer conductor inclined surface 24c that is inclined at an angle of 45 ° with respect to the insertion / extraction direction. In this case, when the outer conductor inclined surface 24c is viewed from the normal direction of the cross section of the outer conductor 24, the outer conductor inclined surface 24c forms a flare surface. The inclination angle of the outer conductor inclined surface 24c is not parallel to the axial direction of the coaxial cable 2 (for example, when the direction parallel to the axial direction is 0 °, the angle is more than 0 ° and less than 180 °). ).

(Outline of the configuration of the cable connector 1)
The cable connector 1 includes a coaxial cable 2, a guide 10 that holds the coaxial cable 2, and a shell 30 that is held when the guide 10 is screwed. The shell 30 is connected to an external electric device or the like via the connection nut 3.

(Guide 10)
The guide 10 is held by the shell 30 by being fitted to the shell 30 by a screw action. The guide 10 has a hole into which the coaxial cable 2 is inserted, and the coaxial cable 2 is inserted into the hole. Then, the guide 10 with the coaxial cable 2 inserted therein is fitted into the shell 30, whereby the guide 10 holding the coaxial cable 2 is held in the shell 30. Furthermore, when the guide 10 holding the coaxial cable 2 is screwed into the shell 30 and tightened, the collar inclined surface 7a of the collar 7 contacts the outer conductor inclined surface 24c of the outer conductor 24.

  Specifically, the guide 10 is incorporated in the inner surface of the guide 10 and is provided so as to be movable along the insertion / extraction direction of the guide 10 with respect to the shell 30; the washer 6 provided in contact with the compensation ring 5; The clamp 8 is pressed by the ring 5 and presses the outer conductor 24 of the coaxial cable 2 toward the collar 7, and the O-ring 9 is provided between the coaxial cable 2 and the inner surface of the guide 10. The O-ring 9 is also provided between the outer surface of the guide 10 and the inner surface of the shell 30.

(Compensation ring 5, clamp 8)
The compensation ring 5 as an elastic member has a substantially cylindrical shape and is made of a metal material. The compensation ring 5 is made of an elastic metal material such as phosphor bronze or beryllium copper. The compensation ring 5 is provided between the guide 10 and the coaxial cable 2, specifically, between the guide 10 and the outer conductor 24, and presses the outer conductor inclined surface 24 c toward the collar inclined surface 7 a side. That is, the compensation ring 5 has a function of pressing the clamp 8 toward the outer conductor 24 side. The clamp 8 is formed in a shape corresponding to the shape of the recess 24 b of the outer conductor 24 of the coaxial cable 2. At least the clamp 8 is formed to have an inclined surface having an inclination corresponding to the inclination of the outer conductor inclined surface 24c. The compensation ring 5 is disposed on the opposite side of the clamp 8 from the side in contact with the outer conductor 24.

  The diameter of the compensation ring 5 is increased as the guide 10 is inserted into the shell 30 and the guide 10 moves to the shell 30 side (hereinafter, the increase in diameter may be referred to as “expansion”). As a result, a force (hereinafter also referred to as “diameter reducing force”) is generated in the compensation ring 5 to return to the diameter before the diameter is expanded. The outer conductor 24 is pressed toward the inner insulator 22 by the diameter reducing force, and the outer conductor inclined surface 24 c is pressed against the collar inclined surface 7 a of the collar 7 along with the pressing.

  Note that the diameter of the compensation ring 5 according to the first embodiment is increased when the guide 10 is inserted into the shell 30. However, in the modified example of the first embodiment, the diameter is reduced in advance. The compensation ring 5 (hereinafter sometimes referred to as “reducing diameter”) can also be used. In this case, the outer conductor inclined surface 24c may be pressed against the collar inclined surface 7a by using a reduced diameter force generated by expanding the diameter of the reduced compensation ring 5 from the inside to the outside of the compensation ring 5. it can.

(Washer 6, O-ring 9)
The washer 6 is provided in contact with the compensation ring 5 and reduces the rotation of the compensation ring 5 around the insertion / extraction direction of the guide 10 with respect to the shell 30. Thereby, the compensation ring 5 moves along the insertion / extraction direction without substantially rotating according to the insertion / extraction of the guide 10 with respect to the shell 30. The O-ring 9 is provided between the sheath 26 of the coaxial cable 2 and the recessed portion provided on the inner surface of the guide 10, between the recessed portion 24 b and the guide 10, and on the outer surface of the guide 10. 30 to 30 respectively. The O-ring 9 prevents foreign substances such as water from entering the cable connector 1 from the outside.

(Shell 30)
The shell 30 is made of a metal material such as brass, and includes a center conductor (not shown) that is electrically connected to the inner conductor 20 of the coaxial cable 2, a spacer 4 that holds the center conductor in the shell 30, and a guide 10. And a collar 7 disposed in the shell 30 with the collar inclined surface 7a facing the insertion side. When the guide 10 that holds the coaxial cable 2 is fixed to the shell 30 by screw action, the inner conductor 20 of the coaxial cable 2 and the central conductor of the shell 30 are electrically connected. Thereby, an electric signal can be propagated between the central conductor and the coaxial cable 2.

  FIG. 3 shows an outline of a state where the outer conductor inclined surface and the collar inclined surface are in contact with each other in the cable connector according to the first embodiment of the present invention. FIG. 4A is a perspective view of the collar according to the first embodiment of the present invention, and FIG. 4B shows an outline of a partially enlarged cross section of the collar inclined surface.

  As shown in FIG. 4A, the collar 7 is formed of a metal material and has a substantially circular shape having an opening having a diameter into which the inner conductor 20 and the inner insulator 22 of the coaxial cable 2 can be inserted. It is formed in a ring shape. In the first embodiment, the collar 7 has a color inclined surface 7a around the opening. The collar inclined surface 7a is inclined from the outer peripheral side of the collar 7 toward the central axis side of the opening. The color inclined surface 7 a is formed with an inclination in either the direction away from the opening of the collar 7 or the direction toward the opening of the collar 7. The inclination angle of the outer conductor inclined surface 24c is not parallel to the axial direction of the coaxial cable 2 (for example, when the direction parallel to the axial direction is 0 °, the angle is more than 0 ° and less than 180 °). ), The collar inclined surface 7a is formed with an inclination of an angle at which the outer conductor inclined surface 24c and the collar inclined surface 7a come into contact with each other according to the angle.

  As shown in FIG. 4B, a plurality of protrusions 7b and a plurality of recesses 7c as protrusions are formed on the surface of the collar inclined surface 7a. The protrusion 7b is formed with an average height of, for example, 5 μm or more and 20 μm or less. When the guide 10 holding the coaxial cable 2 is fixed to the shell 30 by a screw action, the outer conductor inclined surface 24c comes into contact with the collar inclined surface 7a as shown in FIG. Further, although not shown, the collar inclined surface 7 a can further include a coating layer that covers the protrusions formed on the surface and is formed of a material different from the material constituting the outer conductor 24. As the coating layer, for example, a tin plating layer can be used.

  Referring to FIG. 3, the outer conductor inclined surface 24 c of the outer conductor 24 according to the first embodiment is formed in a flare shape when viewed from the axial direction of the coaxial cable 2. The collar 7 is formed in a circular shape. Therefore, the contact portion between the outer conductor inclined surface 24c and the collar 7 is a substantially circular shape.

  FIG. 5A shows an example of a compensation ring according to the first embodiment of the present invention, and FIG. 5B shows another example of the compensation ring according to the first embodiment of the present invention. Show.

  Referring to FIG. 5A, the compensation ring 5a as an example of the compensation ring 5 according to the first embodiment is formed, for example, from a metal material into a substantially cylindrical shape. The compensation ring 5a has a notch 52 along the longitudinal direction. The notch 52 included in the compensation ring 5a is formed by cutting from one end of the compensation ring 5a to the other end. Due to the notch 52, the compensation ring 5a exhibits elasticity.

  The diameter reduction force of the compensation ring 5 is adjusted by adjusting the material of the metal material constituting the compensation ring 5, the thickness of the metal material, the length of the compensation ring 5, and the width and length of the notch 52. When the guide 10 is fixed to the shell 30 by a screw action, the guide 10 can be made to have the same magnitude as the tightening force. In addition, when creep occurs in the outer conductor 24 and the shape of the outer conductor 24 is deformed, the tightening force when the guide 10 is fixed to the shell 30 by a screw action is reduced. Therefore, the diameter reducing force of the compensation ring 5 only needs to be large enough to press at least the clamp 8 toward the outer conductor 24.

  Further, referring to FIG. 5B, a compensation ring 5b as another example of the compensation ring 5 according to the first embodiment is formed from the same material as the compensation ring 5a and having a substantially similar shape. Is done. However, the compensation ring 5 b has a plurality of notches 52. Each of the plurality of notches 52 included in the compensation ring 5b is formed by cutting halfway from one end or the other end of the compensation ring 5b toward the other end or the one end.

(Effects of the first embodiment)
In the cable connector 1 according to the first embodiment of the present invention, since the projection is provided on the collar inclined surface 7a, the contact area between the collar inclined surface 7a and the outer conductor inclined surface 24c can be increased. Since the stress generated by the contact between the inclined surface 7a and the outer conductor inclined surface 24c can be reduced, creep in the outer conductor 24 can be reduced. Further, the protrusion provided on the collar inclined surface 7a breaks through an oxide film formed on the surface of the outer conductor 24 (for example, when the outer conductor 24 is made of aluminum, the oxide film is aluminum oxide). The electrical connection between the collar inclined surface 7a and the outer conductor inclined surface 24c can be improved.

  In the cable connector 1 according to the first embodiment, since the outer conductor 24 is pressed toward the collar 7 by the compensating ring 5 having elasticity, the outer conductor 24 is creeped and the shape of the outer conductor 24 is changed. Even if it changes, the external conductor 24 can be pressed against the collar 7 side following the change. As a result, the cable connector 1 according to the first embodiment has the outer conductor 24 and the collar inclined surface 7a even when the contact pressure of the outer conductor 24 against the collar 7 is reduced due to the occurrence of creep in the outer conductor 24. The contact pressure required for the electrical connection to can be compensated appropriately.

  Further, in the cable connector 1 according to the first embodiment, a coating layer that covers the protrusion of the collar inclined surface 7a is formed on the collar inclined surface 7a, and the material constituting the coating layer and the external conductor 24 are configured. Since the material is a different metal, electrolytic corrosion at the contact portion between the collar inclined surface 7a and the outer conductor inclined surface 24c can be reduced.

  Furthermore, in the cable connector 1 according to the first embodiment, the collar inclined surface 7a, which is an inclined surface, and the outer conductor inclined surface 24c are brought into contact with each other. As a result, the diameter reducing force or the diameter expanding force of the compensating ring 5 is appropriately transmitted to the contact surface between the collar inclined surface 7a and the outer conductor inclined surface 24c, so that the connection between the collar inclined surface 7a and the outer conductor inclined surface 24c is established. It can be maintained properly.

  And even if the cable connector 1 which concerns on 1st Embodiment is the coaxial cable 2 using the aluminum which is easy to generate | occur | produce creep, the electrical connection of the outer conductor inclined surface 24c and the collar inclined surface 7a is appropriate. Even if the outer conductor 24 is deformed by creep, the compensation ring 5 can guarantee the deformation and appropriately maintain the electrical connection between the outer conductor inclined surface 24c and the collar inclined surface 7a. And the coaxial cable 2 excellent in flexibility can be used. Thereby, since it is not necessary to use the coaxial cable conventionally formed using copper, the cheap coaxial cable 2 can be used.

  For example, the cable connector 1 according to the first embodiment can be used for a base station application of a mobile phone, and inter-modulation (Inter-Modulation :) accompanying deformation of the outer conductor 24 based on creep generated in the outer conductor 24. IM) can be suppressed. As a result, voltage breakdown occurs due to radio wave reception failure due to IM generation, deterioration of voltage standing wave ratio (VSWR), and increase in contact resistance due to poor contact between the outer conductor 24 and the collar 7. And radio wave interference in the area of the base station can be suppressed.

[Second Embodiment]
FIG. 6 shows a schematic diagram of a cable connector according to the second embodiment of the present invention. FIG. 7A shows a perspective view of the collar according to the second embodiment of the present invention, and FIG. 7B shows an outline of a partially enlarged cross section of the collar inclined surface. FIG. 8 shows an example of a compensation ring according to the second embodiment of the present invention.

  The cable connector 2 according to the second embodiment is substantially the same as the cable connector 1 according to the first embodiment, except that the collar 11 and the compensation ring 12 having a shape different from that of the first embodiment are provided. The configuration is provided. Therefore, except for the differences, detailed description is omitted.

  In the cable connector 2 according to the second embodiment, unlike the cable connector 1 according to the first embodiment shown in FIG. 2, the normal line of the outer conductor inclined surface 24 c of the outer conductor 24 and the color of the collar 11. Each of the outer conductor inclined surface 24c and the collar inclined surface 11a is formed so that each normal line of the inclined surface 11a is perpendicular to the axial direction of the coaxial cable 2.

  That is, referring to FIG. 7A, the collar 11 is formed in a ring shape having a predetermined width. The collar 11 has at least a normal line of the collar inclined surface 11a which is a surface exposed to the coaxial cable 2 side, a direction perpendicular to the axial direction of the coaxial cable 2, that is, the insertion / extraction direction of the guide 10 to / from the shell 30. The color inclined surface 11a is formed. Referring to FIG. 7B, a plurality of protrusions 11b and a plurality of recesses 11c are formed on the surface of the collar inclined surface 11a. The protrusion 11b is formed to have an average height of, for example, 5 μm or more and 20 μm or less, as in the first embodiment.

  Referring to FIG. 8, the compensation ring 12 according to the second embodiment is formed in a ring shape from a metal material and has a plurality of protrusions 12a provided at intervals on the outer periphery of the ring. Each of the plurality of protrusions 12a is formed to be inclined toward the coaxial cable 2, for example. The compensation ring 12 exhibits elasticity due to the plurality of protrusions 12 a included in the compensation ring 12.

  While the embodiments of the present invention have been described above, the embodiments described above do not limit the invention according to the claims. In addition, it should be noted that not all the combinations of features described in the embodiments are essential to the means for solving the problems of the invention.

DESCRIPTION OF SYMBOLS 1, 1a Cable connector 2 Coaxial cable 3 Connection nut 4 Spacer 5, 5a, 5b, 12 Compensation ring 6 Washer 7, 11 Collar 7a, 11a Collar inclined surface 7b, 11b Protrusion part 7c, 11c Recessed part 8 Clamp 9 O-ring 10 Guide 12a Protrusion 20 Internal conductor 22 Internal insulator 24 External conductor 24a Convex 24b Concave 24c Inclined external conductor 26 Sheath 30 Shell 52 Notch

Claims (6)

A guide for holding a coaxial cable having an inner conductor, an insulator provided on the outer periphery of the inner conductor, and an outer conductor provided on the outer periphery of the insulator including irregularities;
A shell fitted with the guide and having a collar in electrical contact with the outer conductor of the coaxial cable;
The outer conductor is formed including aluminum,
The collar is configured to electrically contact with the outer conductor, viewed contains projections on the surface of the guide side,
The outer conductor has an outer conductor inclined surface that is inclined with respect to the insertion / extraction direction of the guide into the shell,
The collar includes a collar inclined surface that is inclined with respect to a direction in which the guide is inserted into and removed from the shell, is in electrical contact with the outer conductor inclined surface, and includes a protrusion on the surface on the guide side,
Furthermore, a clamp having a shape corresponding to the shape of the concave portion of the outer conductor and an inclined surface corresponding to the outer conductor inclined surface;
An elastic member provided between the guide and the coaxial cable and pressing the clamp by an elastic force to press the outer conductor inclined surface against the collar inclined surface side;
Cable connector comprising a. The cable connector according to claim 1 , wherein the outer conductor inclined surface and the collar inclined surface are inclined in a direction perpendicular to the insertion / extraction direction. The cable connector according to claim 1, wherein the elastic member is made of a metal material and is formed in a substantially cylindrical shape having a notch along a longitudinal direction. The elastic member has a plurality of notches,
4. The cable connector according to claim 3, wherein each of the plurality of cutouts is formed by cutting halfway from one end or the other end of a substantially cylindrical shape toward the other end or the one end. The cable connector according to claim 1 , wherein the collar inclined surface includes a coating layer that covers the protrusion and is formed of a material different from a material that forms the outer conductor. The cable connector according to claim 1 , further comprising a packing provided between the guide and the shell and between the guide and the coaxial cable.

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