JP2024060701A - Coaxial electrical connector and coaxial electrical connector with circuit board - Google Patents

Abstract

To provide a coaxial electrical connector that is easy to accurately position with respect to a circuit board and a coaxial electrical connector with circuit board to which the coaxial electrical connector is attached.SOLUTION: A mounting member 60 has a mounting head part 61 that can be engaged with an upper surface of a flange portion 11A, and a screw shaft part 62 that extends downward from the mounting head part 61 and is arranged to insert through a mounting hole 13 and a through portion P3, a locking member 70 is screwed onto the screw shaft part 62 from below and can engage a circuit board P from below and can hold the flange portion 11A and the circuit board P in concert with the mounting head part 61 by rotating the mounting head part 61, and an extending portion 17 is adjacent to the locking member 70 in a direction around an axis of the screw shaft part 62 so as to contact the locking member freely, and its movement is regulated in a direction parallel to a mounting surface by a positioning portion P4 formed on the edge of the through portion P3.SELECTED DRAWING: Figure 1

Description

The present invention relates to a coaxial electrical connector that is connected to a circuit board and a coaxial electrical connector with a circuit board in which the coaxial electrical connector is attached to the circuit board.

As a coaxial electrical connector mounted on a circuit board, for example, the coaxial electrical connector of Patent Document 1, which is attached to the circuit board by a mounting fixture, is known. The outer conductor of this coaxial electrical connector has a cylindrical body portion having an axis extending in the vertical direction perpendicular to the mounting surface of the circuit board, and a mounting flange portion extending radially outward from the lower part of the body portion. The mounting flange portion has mounting holes that penetrate the mounting flange portion in the vertical direction at two positions on either side of the body portion. The mounting fixture has a mounting member as a screw body that is inserted from above into the mounting hole, and a locking member that is attached by screwing it to the screw shaft portion of the mounting member from below. The locking member has a roughly rectangular columnar outer shape, and a locking claw portion is provided at its lower end for locking it to the circuit board from below. In addition, a square-shaped locking hole is formed in the circuit board that penetrates the circuit board in the vertical direction at a position corresponding to the mounting hole of the coaxial electrical connector.

When the coaxial electrical connector is attached to the circuit board, the locking member is loosely screwed onto the screw shaft of the mounting fixture attached to the coaxial electrical connector. When the coaxial electrical connector is placed on the mounting surface of the circuit board, the screw shaft and the locking member are inserted into the mounting hole of the circuit board from above. At this time, the mounting fixture is inclined in the vertical direction. Next, when the mounting head of the mounting member located on the upper surface of the mounting flange is rotated, the mounting fixture takes an upright position and the locking member is pulled up. When the locking member is pulled up, the locking claw portion locks onto the lower surface of the circuit board from below, and the screw shaft and the locking member are sufficiently tightened, so that the mounting flange and the circuit board are firmly clamped between the mounting head and the locking claw portion. At this time, the outer peripheral surface of the upright locking member comes into contact with the inner edge of the locking hole of the circuit board, positioning the coaxial electrical connector relative to the circuit board.

JP 2021-064497 A

In Patent Document 1, the positioning of the coaxial electrical connector relative to the circuit board is achieved by the outer circumferential surface of the locking member abutting the inner edge of the locking hole in the circuit board, as described above. In other words, the coaxial electrical connector and the circuit board are positioned via the mounting member and locking member of the mounting fixture. Therefore, when attaching the coaxial electrical connector to the circuit board, errors (manufacturing errors and assembly errors) that exist in the relationships between the mounting hole and the mounting member, the mounting member and the locking member, and the locking member and the locking hole are all superimposed, making it difficult to accurately position the coaxial electrical connector relative to the circuit board.

In view of the above circumstances, the present invention aims to provide a coaxial electrical connector that is easy to accurately position on a circuit board, and a coaxial electrical connector with a circuit board in which the coaxial electrical connector is attached to a circuit board.

(1) The coaxial electrical connector of the present invention is a coaxial electrical connector that is connected to a circuit board and has an outer conductor having a cylindrical body portion that extends in a vertical direction perpendicular to the mounting surface of the circuit board, an outer conductor that is provided radially outward of the body portion and has a mounting hole portion that is formed by passing through the outer conductor in a vertical direction for mounting to the circuit board, a dielectric that is accommodated in the internal space of the body portion, and a central conductor that extends in a vertical direction within the internal space and is held by the dielectric.

In such a coaxial electrical connector, the present invention has a mounting fixture arranged to pass through the mounting hole portion and a through-hole formed through the circuit board, the outer conductor has an extension portion extending downward from the flange portion and arranged to pass through the through-hole, the mounting fixture has a mounting member arranged on the flange portion from above and a locking member arranged on the flange portion from below, the mounting member has a mounting head that can be locked to the upper surface of the flange portion, and a mounting hole that extends downward from the mounting head and locks the mounting hole portion and the and a threaded shaft portion arranged to pass through the through-hole, the locking member is screwed onto the threaded shaft portion from below and can be locked to the circuit board from below, and can cooperate with the mounting head to clamp the flange portion and the circuit board by rotating the mounting head, the extension portion is adjacent to the locking member in a direction around the axis of the threaded shaft portion so that it can come into contact with the locking member, and the extension portion is restricted from moving in a direction parallel to the mounting surface by a positioning portion formed on the edge of the through-hole.

When mounting the coaxial electrical connector according to the present invention on a circuit board, the coaxial electrical connector is placed on the mounting surface of the circuit board with the locking member loosely screwed into the screw shaft. At this time, the extension, the screw shaft of the mounting member, and the locking member are arranged so as to pass through the through-hole of the circuit board. The extension is positioned by abutting against a positioning portion formed on the edge of the through-hole in a direction parallel to the mounting surface. Next, the mounting head is rotated to move the locking member upward, and the mounting head and the locking member hold the flange and the circuit board. At this time, the locking member screwed into the screw shaft abuts against the extension in a direction around the axis of the screw shaft, so that it is prevented from rotating together with the screw shaft, and as a result, the locking member and the mounting member move reliably relative to each other. In addition, in the present invention, the movement of the extension of the coaxial electrical connector is restricted by the positioning portion of the circuit board. Therefore, the coaxial electrical connector is directly positioned with respect to the circuit board without the intervention of the mounting member, so that the coaxial electrical connector can be accurately positioned.

(2) The coaxial electrical connector according to the present invention, which is different from the invention of (1), is a coaxial electrical connector connected to a circuit board, and has an outer conductor having a cylindrical body portion extending in a vertical direction perpendicular to the mounting surface of the circuit board, an outer conductor having a flange portion disposed radially outward of the body portion and having a mounting hole portion for mounting to the circuit board penetrating therethrough in the vertical direction, a dielectric contained within the internal space of the body portion, and a central conductor extending in the vertical direction within the internal space and held by the dielectric.

In such a coaxial electrical connector, the present invention has a mounting fixture arranged to pass through the mounting hole portion and the through-hole portion formed through the circuit board, the outer conductor has an extension portion extending downward from the flange portion and arranged to pass through the through-hole, and an engaged portion extending upward from the flange portion, the mounting fixture has a mounting member arranged from below the flange portion and an engaging member arranged from above the flange portion, the mounting member has a mounting head that can be engaged with the underside of the circuit board, and an engaging member that extends upward from the mounting head and engages the through-hole. The through-hole and the threaded shank are arranged to be inserted through the mounting hole, the locking member is screwed onto the threaded shank from above and can be locked to the flange from above, and can cooperate with the mounting head to clamp the flange and the circuit board by rotating the mounting head, the extension is restricted from moving in a direction parallel to the mounting surface by a positioning portion formed on the edge of the through-hole, and the locked portion is adjacent to the locking member so as to be able to abut against it in a direction around the axis of the threaded shank.

When mounting the coaxial electrical connector according to the present invention on a circuit board, the coaxial electrical connector is placed on the mounting surface of the circuit board with the locking member loosely screwed into the screw shaft. At this time, the extension, the mounting head and the screw shaft of the mounting member are arranged so as to pass through the through-hole of the circuit board. Also, the extension is positioned by abutting against the positioning portion formed on the edge of the through-hole in a direction parallel to the mounting surface. Next, the mounting head is rotated to move the locking member downward, and the mounting head and the locking member clamp the flange and the circuit board. At this time, the locking member screwed into the screw shaft abuts against the locked portion in the direction around the axis of the screw shaft, so that it is prevented from rotating together with the screw shaft, and the locking member and the mounting member move relative to each other reliably. Also, in the present invention, the movement of the extension of the coaxial electrical connector is restricted by the positioning portion of the circuit board. Therefore, the coaxial electrical connector is directly positioned with respect to the circuit board without the intervention of the mounting member, so that the coaxial electrical connector can be accurately positioned.

(3) In the invention of (1) or (2), a plurality of the extensions may be provided. By providing a plurality of extensions whose movement is restricted by the positioning portion of the circuit board, more accurate positioning is possible.

(4) In the inventions of (1) to (3), the screw shaft portion may be inserted through a spring member, and the spring member may be compressed vertically by the flange portion and the locking member through rotation of the mounting head. When the spring member thus provided is compressed vertically by the flange portion and the locking member, the elastic force of the spring member acts on the flange portion and the locking member as a reaction force against the compressive force. Therefore, the locking member and the screw shaft portion to which the locking member is screwed, and thus the mounting member, are in a stable position relative to the circuit board, and as a result, the mounting member can be smoothly inserted and disposed through the through-hole.

(5) The coaxial electrical connector with circuit board of the present invention is characterized in that the coaxial electrical connector of (1) to (4) is attached to a circuit board.

The present invention provides a coaxial electrical connector that can be easily positioned accurately on a circuit board, and a coaxial electrical connector with a circuit board in which the coaxial electrical connector is attached to a circuit board.

1A and 1B are perspective views showing a coaxial electrical connector according to an embodiment of the present invention together with a circuit board, in which FIG. 1A shows a state immediately before being attached to the circuit board, and FIG. 1A and 1B are cross-sectional views of a coaxial electrical connector mounted on a circuit board, in which (A) shows a cross-sectional view in an XZ plane including the axis of the central conductor, and (B) shows a cross-sectional view in a YZ plane including the axis of the central conductor. FIG. 2 is a perspective view of the coaxial electrical connector, showing the mounting member, the locking member, and the spring member separated from each other; 1A and 1B are cross-sectional views of a coaxial electrical connector mounted on a circuit board, in which (A) shows a cross-section in a YZ plane including the axis of the central conductor in a state before the mounting member is rotated, and (B) shows a state after the mounting member has been rotated. 1A and 1B are perspective views showing a coaxial electrical connector according to an embodiment of the present invention together with a circuit board according to a modified example, in which FIG. 1A shows a state immediately before attachment to the circuit board, and FIG.

The following describes an embodiment of the present invention with reference to the attached drawings.

Figures 1(A) and (B) are perspective views showing a coaxial electrical connector 1 (hereinafter referred to as "coaxial connector 1") according to an embodiment of the present invention together with a circuit board P, with Figure 1(A) showing the state immediately before attachment to the circuit board P and Figure 1(B) showing the state attached to the circuit board P. Figures 2(A) and (B) are cross-sectional views of the coaxial connector 1 attached to the circuit board, with Figure 2(A) showing a cross-sectional view in the XZ plane including the axis of the central conductor and Figure 2(B) showing a cross-sectional view in the YZ plane including the axis of the central conductor. Figure 3 is a perspective view of the coaxial connector 1, showing the mounting member 60, the locking member 70, and the spring member 80 separated from each other.

The circuit board P on which the coaxial connector 1 is mounted is a so-called test board used for performance testing of electronic components (not shown) such as IC chips. The coaxial connector 1 is also a so-called test connector that is mounted on the circuit board P and connected to a measuring device (not shown) for measuring the electrical characteristics of the electronic components via a mating coaxial connector (not shown) and a coaxial cable (not shown). On the mounting surface of the circuit board P, as shown in FIG. 1, a signal pattern P1 extending in the front-rear direction (Y-axis direction) on the mounting surface and a ground pattern P2 extending in a band shape in the front-rear direction so as to surround the signal pattern P1 are formed. In this embodiment, the Y1 direction in the front-rear direction is defined as "rear" and the Y2 direction is defined as "front". An electronic component (not shown) to be the subject of the performance test is mounted near the end of the front side (Y2 side) of the signal pattern P1, and the coaxial connector 1 is mounted near the end of the rear side (Y1 side) of the signal pattern P1 (connector pattern portion). A mating coaxial connector (not shown) connected to a coaxial cable (not shown) is mated from above into the coaxial connector 1.

In addition, on both sides of the connector pattern portion in the connector width direction (X-axis direction), the circuit board P has hole-shaped through-holes P3 formed outside the ground pattern P2, penetrating the circuit board P in the vertical direction (Z-axis direction), which is its board thickness direction. The through-holes P3 are generally keyhole-shaped when viewed in the vertical direction, and are formed by connecting a generally circular base hole P3A, a straight front guide hole P3B extending forward from the base hole P3A, and a rear guide hole P3C protruding rearward from the base hole P3A. Among the edges of the through-holes P3 formed in the area surrounding the through-holes P3 on the circuit board P, the edges of the front guide hole P3B and the rear guide hole P3C form a front positioning portion P4 and a rear positioning portion P5 for restricting the movement of the coaxial connector 1 in a direction parallel to the circuit board P.

The coaxial connector 1 has an axis that extends in the vertical direction (Z-axis direction) perpendicular to the mounting surface of the circuit board P, and is symmetrical in the X-axis direction and the Y-axis direction. As shown in Figures 2(A) and (B), the coaxial connector 1 has a metal outer conductor 10, a metal central conductor 20 that is arranged in the internal space 16 of the outer conductor 10 so as to be concentric with the internal space 16 described below, a resin dielectric 30, and a metal support 40, a mounting fixture 50 for fixing the coaxial connector 1 to the circuit board P, and a spring member 80 that is provided together with the mounting fixture 50. The mounting fixture 50 also has a mounting member 60 and a locking member 70 that can be screwed together.

The external conductor 10 has a plate-like base 11 extending parallel to the mounting surface of the circuit board P, a cylindrical body 12 extending upward from the upper surface of the base 11, and a number of extensions 17 extending downward from the lower surface of the base 11. As shown in Figures 1(A) and (B), the base 11 is plate-like with the longitudinal direction being the connector width direction (X-axis direction). The base 11 has flanges 11A that protrude outward on both sides of the body 12 in the connector width direction. Each flange 11A has one mounting hole 13 (see Figure 2(A)), which is a screw hole that penetrates the flange 11A in the vertical direction.

2(A) and (B), a bottom groove 14 is formed on the bottom surface of the base 11 at the center in the connector width direction (X-axis direction) and extending in the short direction (Y-axis direction) of the base 11. As shown in FIG. 2(A), the bottom groove 14 is recessed in a rectangular shape from the bottom surface of the base 11 when viewed in the Y-axis direction, and as shown in FIG. 2(B), it extends throughout the entire area of the base 11 in the Y-axis direction and penetrates the base 11. As shown in FIG. 2(A), the groove width dimension (dimension in the X-axis direction) of the bottom groove 14 is larger than the width dimension (dimension in the X-axis direction) of the signal pattern P1 (see FIG. 1) and the outer diameter of the central conductor 20.

The body 12 has a central axis that extends in the vertical direction and is cylindrical in shape, standing upward from the top surface of the base 11. The middle part of the body 12 in the vertical direction has a larger diameter than the other parts.

The outer conductor 10 has a central axis that extends in the vertical direction, and as shown in Figures 2(A) and (B), an internal space 16 is formed that penetrates the base 11 and the body 12 in the vertical direction. The internal space 16 has a large diameter space 16A and a small diameter space 16B that is formed below the large diameter space 16A.

The large diameter space 16A is a cylindrical space formed in a range in the vertical direction from the upper end position of the body portion 12 to a position near the lower end. As shown in Figures 2 (A) and (B), the upper space of the large diameter space 16A has a slightly larger diameter than the lower space. As shown in Figures 3 (A) and (B), the support body 40 is accommodated in the lower space. The upper space is also a space for receiving a mating coaxial connector (not shown) when the mating coaxial connector 1 is mated and connected from above. When the mating coaxial connector is mated and connected, the upper surface of the support body 40 supported by the outer conductor 10 comes into contact with the lower surface of the mating outer conductor (not shown) of the mating coaxial connector, allowing electrical conduction.

As shown in Figures 2(A) and (B), the small diameter space 16B has a smaller diameter than the large diameter space 16A, and is formed in a range in the vertical direction from the lower end position of the large diameter space 16A to the upper end position of the bottom groove portion 14 of the base 11. The small diameter space 16B has an upper space with a slightly larger diameter than the lower space.

As shown in Figs. 1A and 3, the extensions 17 are generally rectangular prism-shaped, with two extensions provided at each end of the base 11 in the connector width direction. Specifically, as shown in Fig. 3, one extension 17 is provided at each end of the base 11, at a position sandwiching the mounting hole 13 in the front-to-rear direction (see also Figs. 4A and 4B). The extensions 17 face each other in the front-to-rear direction and are adjacent to the mounting member 60 with a slight gap between them (see Figs. 4A and 4B). The extensions 17 are formed with dimensions in the connector width direction that are the same as or slightly smaller than the front guide hole P3B and rear guide hole P3C of the circuit board P.

As shown in Figures 2(A) and (B), the central conductor 20 is pin-shaped and extends vertically, and is provided at a position concentric with the internal space 16 when viewed vertically. The central conductor 20 has a connection portion 21 provided at the top to which a mating central conductor (not shown) of a mating coaxial connector is connected, a contact portion 22 provided at the bottom and capable of contacting the signal pattern P1 (see Figure 1) of the circuit board P, and a connecting portion 23 provided between the connection portion 21 and the contact portion 22 to connect the two.

2(A) and (B), the connection part 21 is accommodated in the large diameter space 16A of the outer conductor 10, more specifically, in the internal space 41 (described later) of the support 40 arranged in the large diameter space 16A. The connection part 21 is formed into a substantially cylindrical shape by a plurality of connection pieces arranged in the circumferential direction at its upper part. The mating central conductor (not shown) of the mating coaxial connector is inserted from above into the space surrounded by the plurality of connection pieces. At this time, the plurality of connection pieces are pushed outward in the radial direction of the connection part 21 by the mating central conductor and are elastically deformed, and are brought into contact with the outer peripheral surface of the mating central conductor with contact pressure, thereby enabling electrical conduction with the mating central conductor.

The connecting portion 23 is cylindrical and has a smaller diameter than the connecting portion 21 and the contact portion 22, and is housed in the internal space 16 while being inserted and held in the dielectric 30 as shown in Figures 2(A) and (B). Specifically, the connecting portion 23 extends over a range that straddles both the large diameter space 16A and the small diameter space 16B in the vertical direction.

The contact portion 22 is cylindrical and has a smaller diameter than the connection portion 21, and as shown in Figs. 2A and 2B, extends vertically over approximately the same range as the base portion 11. The lower end of the contact portion 22 protrudes into the bottom groove portion 14, and the other portion is housed in the small diameter space 16B. The lower end of the contact portion 22 protrudes slightly downward from the bottom groove portion 14, and its lower end surface is in reliable contact with the signal pattern P1 (see Fig. 1A). The contact portion 22 has a larger diameter than the connecting portion 23, and abuts against the dielectric 30 from below at a step formed at the boundary position with the connecting portion 23. In other words, the dielectric 30 supports the step from above.

The dielectric 30 is made of, for example, polytetrafluoroethylene (PTFE) and is molded into a generally cylindrical shape. As shown in Figs. 2(A) and (B), the dielectric 30 is formed with an outer diameter that is approximately the same as the inner diameter of the upper space of the small diameter space 16B of the external conductor 10, and is press-fitted and accommodated in this upper space. The upper end of the dielectric 30 has a smaller diameter than the other parts, protrudes above the bottom surface of the large diameter space 16A, and is accommodated in the lower part of the internal space 41 of the support 40, which will be described later.

The dielectric 30 also has a notch (not shown) formed in one circumferential location across the entire vertical area. This notch is formed in the radial direction from the outer peripheral surface of the dielectric 30 to the inner peripheral surface. In other words, the dielectric 30 is discontinuous at the position of the notch in the circumferential direction.

The support 40 is cylindrical and is housed in the lower part of the large diameter space 16A of the external conductor 10. The support 40 has a portion at its upper part that is slightly larger in diameter than the other parts, and is pressed into the external conductor 10 at this portion. The support 40 has an internal space 41 that has a common axis with the internal space 16 of the external conductor 10 and penetrates the support 40. At the lower part of the support 40, a portion that protrudes radially inward toward the internal space 41 is formed over the entire circumferential area of the internal space 41. As shown in Figures 2(A) and (B), this portion comes into contact from above with a step formed at the boundary position between the upper end of the dielectric 30 and the other part, and supports the step.

The mounting member 60 is a screw member with an axial direction in the vertical direction, and as shown in Figs. 2(A), (B) and 3, has a mounting head 61 and a screw shaft portion 62 that extends downward from the mounting head 61 and is arranged to pass through the mounting hole portion 13 of the external conductor 10. The mounting head 61 has a circular shape with an outer diameter larger than the inner diameter of the mounting hole portion 13 when viewed in the vertical direction, and can be engaged from above with the upper surface of the flange portion 11A of the external conductor 10. A cross-shaped groove is formed on the upper surface of the mounting head 61 into which the tip of a tool (e.g., a screwdriver) not shown in the figure is inserted for rotating the mounting member 60. The screw shaft portion 62 has a cylindrical shape with an outer diameter slightly smaller than the mounting hole portion 13, and a screw groove (not shown) is formed on the outer peripheral surface over the entire range in the vertical direction. As shown in Fig. 2(A), the screw shaft portion 62 is longer than the total dimension of the flange portion 11A, the circuit board P and the engaging member 70 in the vertical direction.

The locking member 70 is a plate-like member with the thickness direction being the vertical direction, and a screw hole 71 for screwing the screw shaft portion 62 from below is formed penetrating the locking member 70 in the vertical direction at the center position. The locking member 70 is substantially rectangular when viewed in the vertical direction, and is provided between the two extension portions 17 in the front-rear direction as shown in FIG. 2(B) when the locking member 70 is in a position in which the longitudinal direction is the connector width direction (see also FIGS. 4(A) and (B)). As shown in FIG. 1(A), the longitudinal dimension of the locking member 70 is slightly smaller in the connector width direction than the base hole portion P3A of the circuit board P, and is larger than the width dimension (dimension in the connector width direction) of the front guide hole portion P3B of the circuit board P. Therefore, when the locking member 70 is in a position extending in the connector width direction, both ends of the locking member 70 are located outside the front guide hole portion P3B in the connector width direction. As shown in FIG. 3, the front and rear end faces of the locking member 70 are flat surfaces perpendicular to the front-to-rear direction, and both end faces in the connector width direction are convex curved surfaces that curve along the inner edge of the base hole portion P3A of the circuit board P.

The spring member 80 is a coil spring as shown in FIG. 3, and is fitted from below onto the threaded shaft portion 62 as shown in FIGS. 2(A) and (B). The outer diameter of the spring member 80 is larger than the inner diameters of both the mounting hole portion 13 of the outer conductor 10 and the threaded hole 71 of the locking member 70, and is smaller than the inner diameter of the base hole portion P3A of the circuit board P. The spring member 80 is provided between the flange portion 11A and the locking member 70 in the up-down direction while being fitted onto the threaded shaft portion 62.

Next, we will explain how to use the coaxial connector 1. In this embodiment, the coaxial connector 1 is used by being mounted on a connector pattern portion of a circuit board P (test board) on which electronic components (IC chips, etc.) to be subjected to performance testing are mounted.

First, the screw shaft portion 62 of the mounting member 60 is inserted from above into the mounting hole portion 13 of the external conductor 10. At this time, the mounting member 60 is engaged with the upper surface of the flange portion 11A by the mounting head 61 and remains in that position. Next, the spring member 80 is inserted from below onto the screw shaft portion 62 extending downward from the flange portion 11A. Furthermore, the locking member 70 is screwed from below onto the lower end of the screw shaft portion 62 to be attached. At this time, the locking member 70 is screwed until at least a part of the locking member 70 enters between the two extension portions 17 in the front-rear direction (see FIG. 4(A)). Here, in order to move at least a part of the locking member 70 between the two extension portions 17, the locking member 70 is pinched with the fingers and maintained in a position extended in the connector width direction, while rotating the mounting head 61 of the mounting member 60 in the tightening direction to move the locking member 70 upward. Additionally, the spring member 80 is compressed in the vertical direction by the flange portion 11A and the locking member 70. In this way, the locking member 70 is loosely screwed onto the threaded shaft portion 62, completing preparations for attaching the coaxial connector 1 to the circuit board P.

Next, as shown in FIG. 1A, the coaxial connector 1 is positioned above the circuit board P. At this time, the flange portion 11A of the coaxial connector 1 is positioned directly above the through-hole P3 of the circuit board P. Next, the coaxial connector 1 is placed on the mounting surface of the circuit board P. At this time, the extension portion 17 of the outer conductor 10, the threaded shaft portion 62 of the mounting member 60, and the locking member 70 are arranged so as to pass through the through-hole P3 of the circuit board. Specifically, the threaded shaft portion 62 and the locking member 70 of the mounting member 60 are inserted into the base hole portion P3A, the extension portion 17 located at the front is inserted into the front guide hole portion P3B, and the extension portion 17 located at the rear is inserted into the rear guide hole portion P3C.

In this embodiment, the spring member 80 is compressed in the vertical direction by the flange portion 11A and the locking member 70, so that the elastic force of the spring member 80 acts on the flange portion 11A and the locking member 70 as a reaction force against the compressive force. Therefore, the locking member 70 and the threaded shaft portion 62 to which the locking member 70 is screwed, and thus the mounting member 60, extend without tilting in the vertical direction and assume a stable posture relative to the circuit board P. As a result, the threaded shaft portion 62 and the locking member 70 can be smoothly inserted and disposed in the base hole portion P3A.

As a result of the attachment tool 50 and extension 17 of the coaxial connector 1 being inserted through the through-hole P3, the locking member 70 is positioned below the underside of the circuit board P. The upper part of the front extension 17 is positioned behind the front guide hole P3B, and movement in the connector width direction (X-axis direction) is restricted by the front positioning part P4. The upper part of the rear extension 17 is positioned within the rear guide hole P3C, and movement rearward and in the connector width direction (X-axis direction) is restricted by the rear positioning part P5.

Next, the coaxial connector 1 is slid forward. This sliding movement is performed until the front extension 17 abuts against the front edge of the front guide hole P3B (part of the front positioning portion P4) from behind. As a result, as shown in FIG. 4A, the upper part of the front extension 17 and the upper part of the screw shaft portion 62 of the mounting member 60 are located in the front guide hole P3B. In addition, both ends of the locking member 70 in the connector width direction are located facing the lower surface of the front positioning portion P4 of the circuit board P from below. In this embodiment, the upper part of the rear extension 17 does not enter the front guide hole P3B, but is located in the base hole P3A. As a modified example, the front guide hole P3B may be formed even longer so that the upper part of the rear extension 17 is located in the front guide hole P3B.

When the sliding movement is completed, the lower end surface of the contact portion 22 of the central conductor 20 contacts the signal pattern P1 of the circuit board P from above, and the lower surface of the base portion 11 of the external conductor 10 contacts the ground pattern P2 of the circuit board P from above.

Next, the mounting head 61 is rotated to move the locking member 70 upward, and as shown in FIG. 4(B), the mounting head 61 and the locking member 70 clamp the flange portion 11A and the circuit board P in the vertical direction. At this time, the locking member 70 that is screwed into the screw shaft portion 62 abuts against the extension portion 17 in the direction around the axis of the screw shaft portion 62, and is prevented from rotating together with the screw shaft portion 62. As a result, the locking member 70 and the mounting member 60 reliably move relative to each other, and the locking member 70 moves smoothly upward.

When the flange portion 11A and the circuit board P are firmly clamped by the mounting head 61 and the locking member 70, the contact pressure between the contact portion 22 of the central conductor 20 and the signal pattern P1 of the circuit board P is increased, ensuring contact between the two. In addition, the contact pressure between the base portion 11 of the outer conductor 10 and the ground pattern P2 of the circuit board P is increased, ensuring contact between the two.

A mating coaxial connector (not shown) attached to one end of a coaxial cable (not shown) is fitted and connected from above to the coaxial connector 1. As a result, the mating central conductor (not shown) of the mating coaxial connector is connected to the connection portion 21 of the central conductor 20 of the coaxial connector 1, and the mating outer conductor (not shown) of the mating coaxial connector is connected to the body portion 12 of the outer conductor 10 of the coaxial connector 1. The other end of the coaxial cable is connected to a measuring device (not shown) for measuring electrical characteristics. In a performance test of an electronic component, a voltage is applied to the electronic component mounted on a test board, and the electrical characteristics are measured by the measuring device.

As described above, in this embodiment, the forward extension 17 of the coaxial connector 1 is restricted from moving in a direction parallel to the mounting surface of the circuit board P by the forward positioning portion P4. Therefore, the coaxial connector 1 is positioned directly with respect to the circuit board P without the use of the mounting fixture 50, allowing for accurate positioning of the coaxial connector 1. Also, in this embodiment, extensions 17 are provided on both sides of the body portion 12 in the connector width direction, and positioning is performed by these extensions 17. In this way, by providing multiple extensions 17 whose movement is restricted by the positioning portion P4 of the circuit board P, more accurate positioning is possible.

When removing the coaxial connector 1 from the circuit board P, first, the mounting head 61 of the mounting member 60 is rotated in the opposite direction to the rotation performed when mounting the connector as described above. This rotation moves the locking member 70 downward, and as a result, the flange portion 11A and the circuit board P are released from the clamped state between the mounting head 61 and the locking member 70. Next, the coaxial connector 1 is slid backward until the locking member 70 is positioned directly below the base hole portion P3A of the circuit board P. Then, when the coaxial connector 1 is moved straight upward, the locking member 70 passes through the base hole portion P3A, and the coaxial connector 1 can be easily removed from the circuit board P.

In this embodiment, the through-hole P3 of the circuit board P is formed as a hole, but the shape of the through-hole P3 is not limited to this, and as a modified example, it may be formed as a notch as shown in FIG. 5(A). In the circuit board Q in this modified example, the through-hole Q3 is formed as a notch extending in the front-rear direction and opening at the rear end. Specifically, the through-hole P3 shown in FIG. 1(A) is shaped such that the base hole P3A and the rear guide hole P3C are omitted, and the front guide hole P3B is extended to the rear end of the circuit board P. In the circuit board Q shown in FIG. 5(A), the signal pattern Q1 and the ground pattern Q2 have the same configuration as the signal pattern P1 and the ground pattern P2 of the circuit board P shown in FIG. 1(A), so the description will be omitted.

In this modified example, the through-hole Q3 is open to the rear as described above. Therefore, when attaching the coaxial connector 1 to the circuit board Q, the locking member 70 is loosely screwed onto the screw shaft 62, and the extension 17 and the screw shaft 62 can be inserted into the through-hole Q3 while the coaxial connector 1 is moved diagonally from above and behind toward the rear end of the circuit board P. Then, after the coaxial connector 1 is positioned so that the front extension 17 abuts against the front edge of the through-hole Q3, the mounting head 61 of the mounting member 60 is rotated to move the locking member 70 upward, as in the mounting operation described above, so that the flange 11A and the circuit board P are sandwiched between the mounting head 61 and the locking member 70. In addition, the extension 17 is restricted from moving in a direction parallel to the mounting surface of the circuit board Q, specifically, in the forward and connector width directions, by the positioning portion Q4 formed at the edge of the through-hole Q3.

In this way, by forming the through portion Q3 as a notch, the coaxial connector 1 can be placed on the mounting surface of the circuit board Q while being moved diagonally, in other words, while being moved simultaneously in both forward and downward directions. Therefore, in this modified example, the coaxial connector 1 can be placed on the mounting surface more smoothly than when the coaxial connector 1 is moved straight downward and then slid forward, as in the mounting operation on the circuit board P shown in Figures 1 to 4.

In this embodiment, the mounting member 60 is disposed above the flange portion 11A, and the locking member 70 is disposed below the flange portion 11A. However, as a modified example, the mounting member may be disposed below the flange portion, and the locking member may be disposed above the flange portion. In this modified example, the outer conductor is provided with a locked portion that extends upward from the flange portion, and in this respect, the configuration differs from this embodiment. The locked portion is adjacent to the locking member in a direction around the axis of the screw shaft portion so as to be able to abut against it, and is formed, for example, by one or more protrusions that extend upward from a part of the peripheral portion surrounding the mounting hole portion of the flange portion.

In this modified example, the locking member moves downward by rotating the mounting head, and the flange portion and the circuit board are clamped between the mounting head and the locking member. At this time, the locking member screwed into the screw shaft portion abuts against the locked portion in the direction around the axis of the screw shaft portion, preventing it from rotating together with the screw shaft portion, and ensuring relative movement between the locking member and the mounting member. In addition, because movement of the extension portion of the coaxial connector is restricted by the positioning portion of the circuit board, the coaxial connector is positioned directly with respect to the circuit board without going through the mounting member, which allows for accurate positioning of the coaxial electrical connector.

In this embodiment, the coaxial connector 1 is used for the purpose of testing the performance of electronic components mounted on the circuit board P, but the test subject is not limited to this, and for example, the coaxial connector 1 may be used for the purpose of testing the performance of the circuit board itself. In this case, it is not necessary to mount electronic components on the circuit board.

In this embodiment, the coaxial connector 1 is described as being used as a so-called test connector, but the use is not limited to this, and it may be mounted, for example, on a circuit board provided in an electrical product.

In this embodiment, the entire signal pattern and the entire ground pattern are provided on the mounting surface (top surface) of the circuit board, but instead, for example, at least a part of the signal pattern and the ground pattern may be provided on the back surface (bottom surface) or inner layer of the circuit board so as to extend along the surface of the circuit board. In this case, patterns located at different positions in the thickness direction of the circuit board are connected by vias or the like.

REFERENCE SIGNS LIST 1 coaxial connector 10 outer conductor 11A flange portion 12 body portion 13 mounting hole portion 16 internal space 17 extension portion 20 central conductor 30 dielectric 50 mounting fixture 60 mounting member 61 mounting head portion 62 threaded shaft portion 70 locking member 80 spring member P circuit board P3 penetration portion P4 front positioning portion Q3 penetration portion Q4 positioning portion

Claims (5)

1. A coaxial electrical connector for connection to a circuit board, comprising:
an outer conductor having a cylindrical body portion extending in a vertical direction perpendicular to a mounting surface of the circuit board, and a flange portion provided radially outward of the body portion and having a mounting hole portion for mounting to the circuit board formed therein and passing therethrough in the vertical direction;
A dielectric body accommodated in an internal space of the body portion;
a central conductor extending vertically within the internal space and held by the dielectric,
a mounting tool that is disposed so as to pass through the mounting hole and a through-hole that is formed through the circuit board,
the outer conductor has an extension portion extending downward from the flange portion and disposed so as to be inserted into the through-portion,
the mounting fixture has a mounting member disposed on the flange portion from above and a locking member disposed on the flange portion from below,
The mounting member has a mounting head that can be engaged with an upper surface of the flange portion, and a screw shaft that extends downward from the mounting head and is disposed so as to pass through the mounting hole portion and the through-hole portion,
the locking member is screwed to the screw shaft portion from below and can be locked to the circuit board from below, and can clamp the flange portion and the circuit board in cooperation with the mounting head by rotating the mounting head,
A coaxial electrical connector characterized in that the extension portion is adjacent to the locking member in a direction around the axis of the screw shaft portion so as to be able to abut against the locking member, and is restricted in its movement in a direction parallel to the mounting surface by a positioning portion formed on the edge of the through portion. 1. A coaxial electrical connector for connection to a circuit board, comprising:
an outer conductor having a cylindrical body portion extending in a vertical direction perpendicular to a mounting surface of the circuit board, and a flange portion provided radially outward of the body portion and having a mounting hole portion for mounting to the circuit board formed therein and passing therethrough in the vertical direction;
A dielectric body accommodated in an internal space of the body portion;
a central conductor extending vertically within the internal space and held by the dielectric,
a mounting tool that is disposed so as to pass through the mounting hole and a through-hole that is formed through the circuit board,
the outer conductor has an extension portion extending downward from the flange portion and disposed so as to be inserted into the through-hole, and a locked portion extending upward from the flange portion,
the mounting fixture has a mounting member disposed on the flange portion from below and a locking member disposed on the flange portion from above,
The mounting member has a mounting head that can be engaged with the underside of the circuit board, and a screw shaft portion that extends upward from the mounting head and is disposed so as to pass through the through portion and the mounting hole portion,
the locking member is screwed into the screw shaft portion from above and can be locked to the flange portion from above, and can cooperate with the mounting head to clamp the flange portion and the circuit board by rotating the mounting head,
a positioning portion formed on an edge of the through portion, the extension portion being restricted from moving in a direction parallel to the mounting surface;
The coaxial electrical connector according to claim 1, wherein the locked portion is adjacent to the locking member so as to be able to abut against the locking member in a direction around the axis of the threaded shaft portion. The coaxial electrical connector according to claim 1 or 2, in which a plurality of the extensions are provided. A spring member through which the screw shaft portion is inserted,
3. The coaxial electrical connector according to claim 1, wherein the spring member is compressed in the vertical direction by the flange portion and the locking member when the mounting head is rotated. 3. A coaxial electrical connector attached to a circuit board, comprising: the coaxial electrical connector according to claim 1 or 2 attached to a circuit board.