JP2008112672A - Coaxial electrical connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coaxial electrical connector which can be readily manufactured at low cost and has a center conductor without looseness at supporting, by an insulator and is superior in the high frequency characteristics. <P>SOLUTION: The center conductor 2 is formed by combining a contact member 20 and a connecting member 21, and the contact member 20 is made by machining a metal plate and has an elastic contact part and a first combining part, and the connecting member 21 is made by machining a metal rod member and has a second combining part on connection side with the contact member 20 and an connection part on a free end side. An insulator 3 is provided with an insertion support part 30 in which an insertion hole 31d penetrated for inserting the connecting member 21 of the central conductor 2 is formed and a split support part 31, which extends in the axial direction from the insertion support part 30 and is split up to the boundary position with the insertion support part 30 on a plane, containing the axial line to be capable of opening, as one member. A housing groove 31a, where at least the connecting portion of the first combining part and the second combining part is housed, is formed on the inner face of the split support part 31, and at least a part of the split support part 331 of the insulator 3 is pressed into the external conductor 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a coaxial electrical connector.

As this type of connector, a coaxial connector jack disclosed in Patent Document 1 is known. In the coaxial connector disclosed in Patent Document 1, a jack pin as a center conductor is press-fitted into a through hole formed at a center position of an insulator held by a cylindrical outer conductor, and a front end and a rear end protrude from the insulator. Yes. The through hole is formed with a uniform diameter over the entire area in the axial direction, and the jack pin has a tapered annular protrusion at an intermediate position. The jack pin is press-fitted into the through hole from the tip of the jack pin below the insulator. After the press-fitting, the protruding portion is locked with the inner surface of the through hole, and the jack pin is prevented from being pulled backward.
JP2005-174485

  In the connector of Patent Document 1, there is no description of how the jack pin is processed, but the solid rod member is pressed or turned into a shape having a pointed tip and a tapered annular protrusion. Can be processed. When the jack pin is press-fitted into the through hole of the insulator, the inner surface of the through hole may be slightly shaved off by the protruding portion of the jack pin. Cutting the inner surface of the through-hole with the protrusion means that the play is generated between the jack pin and the inner surface of the through-hole over the entire range through which the protrusion has passed. This play makes the radial position of the jack pin unstable, and as a result, deteriorates the high frequency characteristics of the connector. Furthermore, the connector disclosed in Patent Document 1 requires a rod-shaped material to be processed over the entire length when the jack pin is turned, and the manufacturing range is long.

  In view of such circumstances, it is an object of the present invention to provide a coaxial electrical connector that has a central conductor that is inexpensive and can be easily manufactured and has no play when held by an insulator, and that has excellent high-frequency characteristics.

  The coaxial electrical connector according to the present invention includes a central conductor extending in the axial direction, an insulator that holds the central conductor, and a cylindrical outer conductor that contains the insulator and is concentric with the central conductor.

  In such a coaxial electrical connector, the central conductor combines a contact member formed with an elastic contact portion that contacts a terminal of the mating connector and a connection member formed with a connection portion that extends outside the insulator and is connected to a connection target member. The contact member is made by processing a metal plate and has an elastic contact portion on the free end side and a first connection portion on the connection side with the connection member. The connection member is formed by processing a metal bar member. A second coupling portion formed on the coupling side to the contact member and coupled to the first coupling portion and a connection portion on the free end side, and the insulator can be penetrated for insertion of the connection member of the central conductor. One member includes an insertion holding portion in which an insertion hole is formed and a division holding portion that extends from the insertion holding portion in the axial direction and is split to a boundary position with the insertion holding portion on a plane including the axis so as to be opened. , At least the first coupling on the inner surface of the split holding portion A receiving groove to accommodate the coupling portion between the second coupling portion is formed, part of the divided holding portions of at least the insulator is characterized by being press-fitted into the inside of the external conductor.

  In the coaxial electrical connector having such a configuration, the center conductor is inserted from the connection portion side of the connection member into the divided holding portion side of the insulator in the process of accommodating the center conductor in the insulator during assembly of the connector. The insulating divided holding portion is divided and can be opened, and the connecting portion side of the connecting member is inserted in the axial direction from the opened space, so that the central conductor is inserted into the inserting holding portion by the divided holding portion. And is inserted into the insertion holding portion. In this way, the central conductor is accommodated in the insulator without receiving any resistance. Thereafter, when the insulator is press-fitted into the outer conductor, the divided holding portion is closed and at least the coupling portion between the first coupling portion and the second coupling portion is accommodated in the accommodation groove formed on the inner surface of the divided holding portion. . At this time, at least a part of the divided holding portion is press-fitted inside the outer conductor, whereby the elastic contact portion of the central conductor is pressed in the radial direction by the divided holding portion, and the central conductor is held.

  The center conductor is preferably provided with a locking projection that protrudes from the outer surface of the contact member. Thus, in a state where the insulator is press-fitted into the outer conductor, the locking projection comes into contact with the accommodation groove of the insulator and receives pressure from the outer conductor. By providing a locking projection that protrudes from the outer surface of the contact member, the central conductor is more pressured from the outer conductor by the amount that the locking projection is compressed in the radial direction than when the locking projection is not provided. Will receive. As a result, the central conductor is firmly held by the insulator. Further, since the locking protrusion bites into the housing groove of the insulator at the contact portion and locks so that the insulator does not move in the axial direction, the central conductor is difficult to come off in the axial direction.

  The locking projections are preferably provided at a plurality of positions separated in the axial direction. Since the locking projections come into contact with the housing grooves of the insulator at a plurality of positions separated in the axial direction, the central conductor is less likely to come off in the axial direction compared to the case where the locking projections are provided at one position. Become.

  In the insulator, it is preferable that the protrusion is formed on the surface of the receiving groove at a position corresponding to between two locking protrusions adjacent in the axial direction. By forming the protrusion at such a position, the locking protrusion is locked with the protrusion of the insulator in the axial direction no matter which direction the insulator moves in the axial direction. The conductor is more difficult to remove in the axial direction.

  It is preferable that the insulator has a large-diameter portion having a diameter slightly larger than the outer diameter outside the range in a range including the locking protrusion in the axial direction. Thus, by increasing the outer diameter of the insulator and providing a large-diameter portion, when the insulator is press-fitted into the outer conductor, the insulator is compared with a portion having no large-diameter portion. Receives greater pressure from the outer conductor. Further, by providing the large-diameter portion in a range including the locking projection, which is a portion held by the insulator at a relatively high pressure in the center conductor, the center conductor can be further prevented from coming off.

  The outer conductor has a mounting flange extending in the radial direction at the end position where the connecting portion of the central conductor protrudes in the axial direction, and the insulator has a part of the insertion holding portion in the axial direction than the mounting flange. It may be protruding. Depending on the shape of the board to which the connector is attached, it may be preferable to project a part of the insulator from the external conductor in the axial direction. Since the insertion holding portion of the electrical connector according to the present invention is not divided and has a complete cylindrical surface, a part of the insertion holding portion is more axial than the mounting flange located at the end of the outer conductor. Even if it protrudes, it looks good.

  In the present invention, as described above, the central conductor is formed by combining the contact member by processing the metal plate and the connection member by processing the bar member, so that the processing range can be shortened and the material cost can be reduced. Processing cost is reduced. In addition, the insulator that holds the center conductor is divided from one end in the axial direction to the middle position to form a split holding portion, and the center conductor is inserted from here so that it can be opened widely at the one end. The center conductor can be easily inserted as compared with the case where the center conductor is press-fitted into a non-insulated body. Therefore, there is no problem of shaving due to press-fitting of the center conductor into the insulator, and there is no play due to shaving, so that the position of the center conductor is stable and high frequency characteristics are maintained well. Further, after the center conductor is inserted, the split holding part is closed and the insulator is pressed into the outer conductor to hold the center conductor firmly through the insulator. Since a part is accommodated in the outer conductor, there is no decrease in holding force here.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a completed view of the coaxial electrical connector according to the present embodiment. The right half of the figure is a cross-sectional view taken along the plane including the connector axis. A coaxial electrical connector 1 (hereinafter simply referred to as “connector 1”) includes a central conductor 2 extending in the axial direction, an insulator 3 that holds the central conductor 2, and a cylinder that accommodates the insulator 3 and is concentric with the central conductor 2. The outer conductor 4 has a shape.

  FIG. 2 is a view showing the connector 1 shown in FIG. 1 before assembly, and is a view seen from a direction different by 90 degrees in the circumferential direction. The In the figure, the central conductor 2, the insulator 3 and the outer conductor 4 are shown separately, and the right half of the insulator 3 and the right half of the outer conductor 4 are cross-sectioned by planes including their respective axes. Yes. The center conductor 2 is configured by combining a contact member 20 that contacts a terminal of a mating connector and a connection member 21 that is connected to a connection target member (not shown). In this embodiment, the center conductor 2 of the connector 1 is a female terminal, and accepts a male terminal of a mating connector (not shown).

  FIG. 3 is a diagram illustrating a state before the center conductor 2 illustrated in FIG. 2 is coupled. The contact member 20 has a cylindrical shape having a butted portion 20e formed by rolling and forming a metal plate made of phosphor bronze having high spring property. One end of the contact member 20, specifically, the upper end that becomes the free end after coupling is an elastic contact portion 20 a that receives a pin-shaped male terminal of a mating connector (not shown), and the other end is a cylindrical shape that is coupled to the connection member 21. The first coupling portion 20b is formed. Further, as will be described later, the peripheral wall of the contact member 20 is cut and raised at a plurality of positions in the axial direction and in the circumferential direction so as to protrude from the outer surface of the peripheral wall, and a plurality of locking projections 20c-1, 20c-2, 20d. -1 and 20d-2 are formed. Hereinafter, for the convenience of explanation, the locking projection 20c-1 and the locking projection 20c-2 are referred to as "locking projection 20c" and the locking projection 20d-1 and the locking projection 20d-2 are referred to as "locking projection" as necessary. 20d ". The locking projection 20c and the locking projection 20d are formed at positions separated in the axial direction. In this embodiment, the locking projections are formed at two positions spaced apart in the axial direction, but the locking projections may be formed at three or more positions spaced apart in the axial direction.

  4 is a cross-sectional view taken along the line IV-IV in the contact member 20 of FIG. As described above, the locking protrusions 20c and 20d are formed by being cut and raised so as to protrude from the outer peripheral surface of the contact member 20. The locking protrusion 20c and the locking protrusion 20d are located approximately 90 degrees apart from each other in the circumferential direction of the outer surface of the contact member 20, as shown in FIG. Further, the locking projection 20c-1 and the locking projection 20c-2 are positioned symmetrically across the axis of the contact member 20, and the locking projection 20d-1 and the locking projection 20d-2 also sandwich the axis of the contact member 20. It is located symmetrically.

  The connecting member 21 shown in FIG. 3 is made by processing a metal rod member made of brass that is highly workable and inexpensive. One end of the connection member 21, specifically, the lower end that becomes a free end after coupling with the contact member 20 is a connection portion 21 a connected to a connection target member such as a circuit board or a cable (not shown), and the other end is FIG. As shown in FIG. 2, the shaft-shaped second coupling portion 21b coupled to the coupling portion 20b of the contact member 20 is formed. The connection portion 21a is cut so as to have a flat surface parallel to the axis, with a cross section perpendicular to the axis of the connection member 21 being a semicircle. In addition, the shape of the connection part 21a is not restricted to this, It can process into an optimal shape according to the position and shape of a connection object member, a connection method, etc.

  The center conductor 2 is configured by fitting the second coupling portion 21b of the connecting member 21 into the first coupling portion 20b of the contact member 20, as indicated by an arrow in FIG. In the present embodiment, the contact member 20 and the connection member 21 are fitted, but means for coupling the contact member 20 and the connection member 21 is not limited to this, and for example, welding is also possible.

  In this embodiment, as described above, the central conductor 2 is not formed by turning a single metal member, but is processed by turning the contact member 20 formed by processing a metal plate and a metal bar member or the like. Therefore, the processing range can be shortened and the processing cost can be kept low. This not only reduces the amount of processing such as turning, but also leads to the fact that since the members are short, there is no bending and vibration during processing such as turning and stable high-accuracy processing can be performed. Furthermore, the materials of the contact member 20 and the connection member 21 can be appropriately selected in consideration of the characteristics and cost of both members.

  The insulator 3 shown in FIG. 2 is formed of, for example, a tetrafluoride resin, and has an insertion holding portion 30 in which an insertion hole 31d that penetrates in the axial direction for insertion of the connection member 21 of the center conductor 2 is formed. And a split holding portion 31 that extends in the axial direction from the insertion holding portion 30 and is split into two at a plane including the axis to the boundary position with the insertion holding portion 30 and can be opened. An accommodating groove 31a for accommodating the elastic contact portion 20a of the contact member 20 is formed inside the divided holding portion 31 so as to communicate with the insertion hole 31d. In the insulator 3, an annular protrusion 31 b is formed in the accommodation groove 31 a of the division holding portion 31. The position in the axial direction where the protrusion 31b is formed corresponds to between the locking protrusion 20c and the locking protrusion 20d of the contact member 20 when the central conductor 2 is inserted into the insulator 3. The insulator 3 has a large diameter portion 31c having a diameter slightly larger than the outer diameter outside the range in a range including the locking projections 20c and 20d in the axial direction. In the present embodiment, the division holding unit 31 is divided into two parts, but the division holding unit may be divided into three or more parts.

  FIG. 5 is a VV cross-sectional view of the insulator 3 of FIG. However, this VV cross-sectional view is an arrow view in a state where the divided holding portion 31 is closed. As shown in the figure, when the divided holding portion 31 is closed, the insulator becomes a complete cylindrical body, and a cylindrical surface is formed by the receiving groove 31a of the divided holding portion 31, and the central conductor 2 is formed in the receiving groove 31a. The contact member 20 is held.

  The outer conductor 4 shown in FIG. 2 is made of a metal material in a cylindrical shape, and has a radially extending mounting flange 40 at one end (lower end in FIG. 2) for mounting the connector to the connection target member. have. A screw portion 41 is formed on the outer peripheral surface of the outer conductor 4. The screw part 41 is screwed with a nut for coupling with an external conductor of a mating connector (not shown). By this screwing, the connectors are fixed in a connected state. A plurality of mounting holes (not shown) are formed in the mounting flange 40 in the axial direction. When the connector 1 is mounted on a circuit board or the like, the connector 1 is fixed to the circuit board or the like by passing a screw or the like through the mounting hole.

  The connector 1 having such a configuration is assembled in the following manner.

  First, the center conductor 2 is inserted into the insulator 3 and stored. As shown in FIG. 2, the split holding part 31 of the insulator 3 is left open, the central conductor 2 is inserted from here on the connection part 21 a side of the connection member 21, and the entire contact member 20 is split. To fit. In this way, the center conductor 2 can be easily inserted by keeping the divided holding portion 31 open. Therefore, there is no problem of shaving due to press-fitting of the center conductor 2 into the insulator 3 as in the conventional connector, and there is no backlash due to the shaving, so the position of the center conductor 2 is stable and the high frequency characteristics are good. Maintained. In the present embodiment, the entire contact member 20 is stored in the divided holding unit 31, but a part of the contact member 20 may be stored in the divided holding unit 31. Even in this case, the coupling portion between the first coupling portion 20b of the contact member 20 and the second coupling portion 21b of the contact member 21 is accommodated in the receiving groove 31a, and a part of the coupling portion is inserted into the insertion hole 31d. Has been inserted.

  In a state where the entire contact member 20 is accommodated in the divided holding portion 31, the locking projections 20 c and 20 d are positioned in the range of the large diameter portion 31 c of the insulator 3 in the axial direction and are formed in the housing groove 31 a of the insulator 3. The protruding portion 31b is located between the locking projections 20c and 20d in the axial direction. In this state, the connecting portion 21 a protrudes from the insertion holding portion 30 of the insulator 3 in the axial direction.

  Next, the insulator 3 containing the central conductor 2 is press-fitted into the external conductor 4 from the insertion holding unit 30 side. Then, as shown in FIG. 1, the assembly of the connector 1 is completed by press-fitting until the end face of the divided holding portion 31 enters the inside of the outer conductor 4 in the axial direction. In the state where the press-fitting of the insulator 3 is completed, as shown in FIG. 1, a part of the insertion holding portion 30 protrudes in the axial direction from the mounting flange 40. Here, since the insertion holding part 30 is not divided | segmented and has a perfect cylindrical surface, even if the insertion holding part 30 protrudes from the attachment flange 40, it looks good.

  In the connector 1 that has been assembled, the insulator 3 press-fitted into the outer conductor 4 is held by receiving pressure from the outer conductor 4 in the radial direction. The central conductor 2 housed in the insulator 3 is held by receiving pressure from the external conductor 4 via the insulator 3. In the present embodiment, as described above, the insulator 3 has the divided holding portion 31 divided into two, and inwardly in the radial direction, compared to the case where the insulator 3 is not divided. When receiving an external force, the divided holding portion 31 can be largely displaced in the radial direction. Therefore, when the insulator 3 receives pressure from the outer conductor 4, the divided holding portion 31 closes and the diameter of the insulator 3 is relatively large, and the holding force of the insulator 3 becomes larger. It becomes difficult to come off in the axial direction.

  Further, when the divided holding portion 31 of the insulator 3 is closed by receiving pressure from the outer conductor 4, the locking projections 20c and 20d abut against the receiving groove 31a and are pushed inward in the radial direction, and bite into the receiving groove 31a. . As a result, the center conductor 2 is firmly held by the insulator 3 and is difficult to be removed in the axial direction. Further, in the present embodiment, the locking projections 20c and 20d are provided at two positions apart in the axial direction, and in the axial direction compared to the case where the locking projections are formed at one position. The center conductor 2 is more firmly held and is less likely to come off because the position where it contacts the insulator 3 is increased. Further, the protrusion 31b formed in the housing groove 31a is located at a corresponding portion between the locking projection 20c and the locking projection 20d, and is locked with both the locking projections 20c and 20d. As a result, the central conductor 2 is further less likely to be pulled out upward and downward in the axial direction.

  Furthermore, as described above, the large-diameter portion 31c of the insulator 3 is in a position including the locking protrusions 20c and 20d of the center conductor 2 in the axial direction. When the insulator 3 is press-fitted, the insulator 3 has a larger pressure at the large-diameter portion 31c because the radial diameter of the large-diameter portion 31c is larger than when the large-diameter portion 31c is not provided. Is received from the outer conductor 4. As a result, a larger pressure is applied to the latching protrusions 20c and 20d through the insulator 3 than when the large-diameter portion 31c is not provided, so that the central conductor 2 is more difficult to come off in the axial direction. Become.

It is a completion figure of the coaxial electrical connector which concerns on this embodiment. It is a figure which shows the assembly before the connector shown in FIG. It is a figure which shows the state before the coupling | bonding of the center conductor shown in FIG. It is IV-IV sectional drawing in the contact member of FIG. It is VV sectional drawing in the insulator of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Connector 21a Connection part 2 Center conductor 21b 2nd coupling part 3 Insulator 30 Insertion holding part 4 Outer conductor 31 Divided holding part 20 Contact member 31a Housing groove 20a Elastic contact part 31b Protrusion part 20b 1st coupling part 31c Large diameter part 20c Locking protrusion 31d Insertion hole 20d Locking protrusion 40 Mounting flange 21 Connecting member

Claims (6)

  A coaxial electrical connector having a central conductor extending in the axial direction, an insulator that holds the central conductor, and a cylindrical outer conductor that contains the insulator and is concentric with the central conductor. A contact member formed with an elastic contact portion that comes into contact with a terminal and a connection member formed with a connection portion that extends out of the insulator and is connected to a connection target member are formed. The contact member processes a metal plate. An elastic contact portion on the free end side and a first coupling portion on the coupling side with the connection member, and the connection member is made by processing a metal bar member and is coupled to the contact member on the coupling side. An insertion holding portion having a second coupling portion coupled to the first coupling portion and a connection portion on the free end side, and an insulator through which an insertion hole for insertion of the connection member of the central conductor is formed. It extends in the axial direction from the holding part and is a plane including the axial line. A split holding portion that is divided up to a boundary position with the insertion holding portion and can be opened as a single member, and that accommodates at least a coupling portion between the first coupling portion and the second coupling portion on the inner surface of the split holding portion A coaxial electrical connector, characterized in that a groove is formed and at least a part of the divided holding portion of the insulator is press-fitted into the outer conductor.   The coaxial electrical connector according to claim 1, wherein the center conductor is provided with a locking projection protruding from the outer surface of the contact member.   The coaxial electrical connector according to claim 2, wherein the locking projections are provided at a plurality of positions separated in the axial direction.   4. The coaxial electrical connector according to claim 3, wherein the insulator has a protrusion formed on the surface of the receiving groove at a position corresponding to between two locking projections adjacent in the axial direction. 5. The insulator according to claim 2, wherein the insulator includes a large-diameter portion having a diameter slightly larger than an outer diameter outside the range in a range including the locking protrusion in the axial direction. A coaxial electrical connector as described in 1.   The outer conductor has a mounting flange extending in the radial direction at the end position where the connecting portion of the central conductor protrudes in the axial direction, and the insulator has a part of the insertion holding portion in the axial direction than the mounting flange. The coaxial electrical connector according to claim 1, wherein the coaxial electrical connector protrudes.

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