JPH11307158A - Coaxial connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coaxial connector that can be joined to a receptacle in a mechanically and electrically stable state and has a low height. SOLUTION: A socket 23 has a spring contact part 33 and a connection part 29 to be connected to a central conductor 26c of a coaxial cable 26. The spring contact part 33 has a shape formed by bending a plate spring having a certain width into a cross-sectionally C-shaped form and is displaced in the radially outside direction when a central conductor 43 of a receptacle 41 is pressed in, so that the spring contact part 33 is brought into press contact with the outside peripheral surface of the central conductor 43. The connection part 29 is bent in a direction perpendicular to the center axis direction of the spring contact part 33. One tip part of the central conductor 26c of the coaxial cable 26 is connected to the connection part 29 by means of crimping.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coaxial connector used for connecting a coaxial cable, and more particularly to a coaxial connector used as a component of a portable communication device.

[0002]

2. Description of the Related Art An example of a conventional coaxial connector of this type is shown in FIGS. The coaxial connector 15 includes a metal housing 1, a socket 2, and a bushing 3. The socket 2 is made of a metal having a spring property, and has two spring contact pieces 2a which are in pressure contact with the outer peripheral surface of the center conductor 11 of the receptacle 4 at each end side. These two spring contact pieces 2a are integrally connected to each other by a connecting portion 2b. The socket 2 is housed in the housing hole 3a with the two spring contact pieces 2a straddling the bridge portion 12 stretched into the housing hole 3a of the bushing 3.

On the other hand, a pressing member 13 provided integrally with the bushing 3 is disposed between the connecting portion 2b of the socket 2 and the lid 7 of the housing 1. Since the coupling portion 2b of the socket 2 is sandwiched between the bridge portion 12 and the pressing member 13, there is no concern that the socket 2 may move in the accommodation hole 3a in the axial direction or fall out of the accommodation hole 3a. Absent. The center conductor 8b of the coaxial cable 8 is connected to the joint 2b of the socket 2.

[0004]

In recent years, very small and thin communication devices have become widespread.
Along with this, electronic components used in these devices are also small and short, and even for coaxial connectors, small and short electronic components are required. However, in order to reduce the height of the conventional coaxial connector 15, it is necessary to shorten the length of the fitting portion with the receptacle 4.

However, when the length of the coaxial connector 15 to be fitted to the receptacle 4 is reduced, the length of the two spring contact pieces 2a of the socket 2 must be reduced accordingly. And these spring contact pieces 2a
As the length becomes shorter, the spring limit (the limit value of the spring displacement that can return to the original position without losing the restoring force) becomes smaller. For this reason, when the coaxial connector 15 is coupled to the receptacle 4, the spring displacement of the spring contact piece 2a exceeds the spring limit, and the spring contact piece 2a is damaged, depending on the dimensional variation of the components constituting the coaxial connector 15. There are cases. Alternatively, the coaxial connector 15 may be connected to the receptacle 4.
If the spring contact piece 2a is detached several times, the spring contact piece 2a may not be able to press against the center conductor 11 of the receptacle 4 with a sufficient pressure. Therefore, the conventional coaxial connector 15 is
There is a problem that a stable coupling state with the receptacle 4 is impaired due to the reduction in height.

An object of the present invention is to provide a coaxial connector which can be coupled to a receptacle in a mechanically and electrically stable state and has a short height.

[0007]

In order to achieve the above object, a coaxial connector according to the present invention comprises: (a) a cylindrical portion which comes into contact with an outer conductor of a receptacle; And (b) a spring contact portion having a substantially C-shaped cross section for press-fitting the center conductor of the receptacle and expanding radially outward and pressing against the outer peripheral surface of the center conductor of the receptacle. A socket having a connecting portion connected to a central conductor of the coaxial cable, which is integrally pulled out from the spring contact portion and bent in a direction orthogonal to a central axis direction of the spring contact portion;
(C) a housing having a housing hole for housing the socket, and a bushing mounted in a cylindrical portion of the housing.

With the above construction, the spring contact portion having the socket having a substantially C-shaped cross section is displaced radially outward by the press-fit of the center conductor of the receptacle, and the outer peripheral surface of the center conductor of the receptacle is caused by the spring force. Press against That is, the contact portion between the conventional socket and the center conductor of the receptacle is
While the socket extends in the axial direction of the center conductor of the receptacle, the contact portion between the spring contact portion of the socket of the present invention and the center conductor of the receptacle extends in the outer circumferential direction of the center conductor of the receptacle. . Therefore, the height of the joint between the socket and the center conductor of the receptacle is reduced. further,
The connection portion of the socket is also bent in a direction perpendicular to the center axis direction of the spring contact portion, so that the height of the socket is reduced.

Further, in the coaxial connector according to the present invention, at least two portions of the outer peripheral surface of the spring contact portion of the socket into which the center conductor of the receptacle is press-fitted and radially outwardly expands are provided on the inner peripheral surface of the housing hole of the bushing. Is characterized by being in contact with Thereby, the radial outward expansion of the spring contact portion is regulated by the inner peripheral surface of the housing hole of the bushing,
Problems such as the spring contact portion expanding more than necessary or deforming beyond the spring limit are eliminated.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a coaxial connector according to an embodiment of the present invention.

1 to 3 show the configuration of a coaxial connector according to one embodiment of the present invention. The coaxial connector 20
The housing 21 includes a housing 21 made of a metal having a spring property, a bushing 22 made of an insulative resin mounted in the housing 21, and a socket 23 made of a metal having a spring property and held by the bushing 22.

As shown in FIG. 1, the housing 21 includes a cylindrical portion 24 that contacts an external conductor 42 of a receptacle 41 (see FIGS. 2 and 3), a lid portion 25 that covers an upper opening of the cylindrical portion 24, The coaxial cable 26 pulled out from the tubular portion 24
And a pair of cover portions 27 each having an arc-shaped cross section that cover the outer conductor 26a from both sides thereof. It has a portion 28. The caulking portion 28 is a claw portion 28a that is partially caulked on the outer skin 26b of the coaxial cable 26.
A bushing 22 is inserted and fixed in the tubular portion 24 of the housing 21 from an upper opening.

The bushing 22 is a sectional view taken along the line XX and a sectional view taken along the line YY of FIG. 4 (A).
As shown in (1), the outer diameter at the distal end (lower side) in the insertion direction of the housing 21 into the cylindrical portion 24 (see FIG. 1) is smaller than the outer diameter at the upper side, and is tapered. Bushing 2
As shown in FIG. 4A, two projecting pieces 22a that protrude in the radial direction are provided on the upper part of 2 in opposition. These two protruding pieces 22a fit into notches 24a formed on the upper opening side of the cylindrical portion 24. Thereby, the bushing 22 is positioned with respect to the housing 21.

Further, the bushing 22 has a rectangular fitting recess 32 into which a support portion 33a of a spring contact portion 33 of the socket 23 described later fits, and the bushing 22 penetrates from the fitting recess 32 in the direction of the center axis of the bushing 22. And a spring contact portion accommodating hole 35 for accommodating the spring contact portion 33 of the socket 23. The cross-sectional dimension of the fitting recess 32 is the spring contact portion accommodation hole 3.
5 and a stepped portion 36 (see FIGS. 4B and 4C) is formed between the fitting recess 32 and the spring contact portion accommodating hole 35. Spring contact portion accommodation hole 35
A concave portion 31 is formed on an inner wall surface of the socket 23 for receiving a spring contact portion 33 (described later) of the socket 23 displaced radially outward by press fitting of the center conductor 43 of the receptacle 41.
The inner wall of the fitting recess 32 is formed in a tapered shape, and the cross-sectional dimension of the fitting recess 32 gradually decreases toward the step portion 36 (see FIG. 4C). In the upper part of the bushing 22,
A pressing member 37 for pressing the support portion 33a of the socket 23 toward the step portion 36 is provided integrally.

As shown in FIGS. 5A to 5C, the socket 23 includes a spring contact portion 33 and a coaxial cable 26 (FIG. 2).
(See FIG. 2). The spring contact portion 33 has a shape in which a leaf spring having a constant width is curved so that the cross-sectional shape becomes a C-shape. When the center conductor 43 of the receptacle 41 is press-fitted, the spring contact portion 33 is displaced radially outward as shown by a dotted line in FIG. The inner peripheral surface of is pressed. The inner diameter of the spring contact portion 33 is set smaller than the outer diameter of the center conductor 43 within a range equal to or less than the elastic limit.

Further, the spring contact portion 33 has a support portion 33a on its upper part. The cross section of the support portion 33 a having a size substantially equal to the size of the fitting concave portion 32 of the bushing 22 has a substantially square shape, and is drawn integrally from the spring contact portion 33. The support portion 33a is capable of accommodating, at the inside thereof, the front end portion of the center conductor 43 of the receptacle 41 penetrating the spring contact portion 33 on the press-fit side (FIGS. 2 and 3).
reference).

From the support portion 33a, the coaxial cable 26
A connecting portion 29 for electrically connecting the center conductor 26c (see FIGS. 2 and 3) is integrally pulled out. The connection portion 29 is bent in a direction orthogonal to the center axis direction of the spring contact portion 33. The connecting portion 29 has two tongue pieces 29
The tip of the central conductor 26c of the coaxial cable 26 is inserted between these tongue pieces 29a, and caulked by the two tongue pieces 29a. Thereby, the socket 2
3 is electrically connected to the center conductor 26c of the coaxial cable 26.

The socket 2 to which the coaxial cable 26 is connected
3, as shown in FIGS. 2 and 3, the support portion 33 a of the spring contact portion 33 is fitted into the fitting recess 32 of the bushing 22, and the spring contact portion 33 is fitted in the spring contact portion receiving hole 35 (FIG. 4).
See). Then, the pressing member 37 formed integrally with the bushing 22 is bent to close the opening of the fitting recess 32. In this state, after the bushing 22 is accommodated in the cylindrical portion 24 of the housing 21, the lid 25 of the housing 21 is bent and put on the upper surface of the bushing 22. Next, the swaging portion 28 of the housing 21 is connected to the pair of cover portions 2.
7, and the coaxial cable 26 is gripped from above these cover portions 27. Further, the claw portion 28a is swaged on the outer skin 26b of the coaxial cable 26.

When the coaxial connector 20 thus obtained is connected to the receptacle 41, the inner conductor 43 of the receptacle 41 passes through the spring contact portion 33 of the socket 23,
The tip portion on the press-in side is the support portion 33a of the spring contact portion 33.
It is inserted until it reaches inside. At this time, the spring contact portion 33
The central conductor 43 of the receptacle 41 is press-fitted and is displaced radially outward, and presses against the outer peripheral surface of the central conductor 43 by its spring force. That is, the contact portion between the spring contact piece 2a of the socket 2 of the conventional coaxial connector 15 and the center conductor 11 of the receptacle 4 shown in FIGS.
1, the contact portion between the spring contact portion 33 of the socket 23 of the coaxial connector 20 of the present embodiment and the center conductor 43 of the receptacle 41 extends in the outer peripheral direction of the center conductor 43. Extending. Therefore, socket 23
And the height of the joint between the receptacle 41 and the center conductor 43 of the receptacle 41 can be reduced.

Further, even if the coaxial connector 20 is reduced in height,
The spring limit of the spring contact portion 33 of the socket 23 is always constant irrespective of the press-fit stroke in which the center conductor 43 of the receptacle 41 is press-fitted. Therefore, the spring contact portion 33 of the socket 23 comes into stable contact with the center conductor 43, and the mechanical and electrical reliability and stability of the coupling state between the coaxial connector 20 and the receptacle 41 can be sufficiently ensured.

In this embodiment, the pressing member 3 disposed between the lid 25 of the housing 21 and the socket 23 is provided.
7 presses the support portion 33a of the socket 23 toward the step portion 36 formed between the fitting recess 32 of the bushing 22 and the spring contact portion accommodating hole 35, so that the support portion 33a is engaged with the step portion 36. Is stopped. Therefore, the socket 23 is prevented from coming off from the bushing 22, and the socket 23 can be reliably held in the bushing 22 even when the height of the coaxial connector 20 is reduced.

The present invention is not limited to the above embodiment, but can be variously modified within the scope of the invention. For example, in the above-described embodiment, the bushing 2 is used to accommodate the spring contact portion 33 of the socket 23 that has been displaced radially outward by press-fitting of the center conductor 43 of the receptacle 41.
The recess 31 (FIG. 2) is formed on the inner peripheral surface of the spring contact portion accommodation hole 35 of FIG.
And FIG. 3). However, as shown in FIG. 6, at least two positions on the outer peripheral surface of the spring contact portion 33 into which the center conductor 43 is press-fitted and spread radially outward contact the inner peripheral surface of the spring contact portion receiving hole 35. Is also good. In this case, the radial expansion of the spring contact portion 33 is
Restrictions are given by the inner peripheral surface of the spring contact portion accommodation hole 35, and problems such as the spring contact portion 33 expanding more than necessary or deforming beyond the spring limit are eliminated. As a result, the spring contact portion 33 can be more stably pressed against the outer peripheral surface of the center conductor 43.

Also, the size of the inner periphery of the spring contact portion receiving hole 35 is made slightly smaller than the outer periphery of the spring contact portion 33 in a state where the center conductor 43 of the receptacle 41 is press-fitted, so that the spring force of the spring contact portion 33 is increased. The central conductor 43 of the receptacle 41 can be held by the socket 23 by the elastic force of the bushing 22 and the holding force of the socket 23 can be increased. In this case, as the material of the bushing 22, a highly elastic resin or the like is used.

[0024]

As is apparent from the above description, the spring contact portion having a substantially C-shaped cross section of the socket is displaced radially outward by the press-fit of the center conductor of the receptacle, and the receptacle is displaced by the spring force. Is pressed against the outer peripheral surface of the central conductor.
That is, the contact portion between the conventional socket and the center conductor of the receptacle extends in the axial direction of the center conductor of the receptacle, whereas the contact portion between the spring contact portion of the socket of the present invention and the center conductor of the receptacle is The portion extends in the outer circumferential direction of the center conductor of the receptacle. Accordingly, the height of the joint between the socket and the center conductor of the receptacle can be reduced. Further, since the connection portion of the socket is also bent in a direction perpendicular to the center axis direction of the spring contact portion, the height of the socket can be reduced.

Further, even if the height of the coaxial connector is reduced, the spring limit of the spring contact portion of the socket is always constant irrespective of the press-fit stroke in which the center conductor of the receptacle is press-fitted. Therefore, the coaxial connector can be obtained in which the spring contact portion of the socket is stably contacted with the center conductor of the receptacle, and is coupled to the receptacle in a mechanically and electrically stable state.

Further, at least two portions of the outer peripheral surface of the spring contact portion of the socket, into which the center conductor of the receptacle is press-fitted and spread radially outward, are brought into contact with the inner peripheral surface of the housing hole of the bushing. The radial expansion of the spring contact portion is restricted by the inner peripheral surface of the housing hole of the bushing, and the spring contact portion expands more than necessary, or
Problems such as deformation beyond the spring limit are eliminated.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing one embodiment of a coaxial connector according to the present invention.

FIG. 2 is a sectional view of the coaxial connector shown in FIG. 1;

FIG. 3 is a cross-sectional view of the coaxial connector seen from the direction of arrow A in FIG. 2;

4A and 4B show a bushing of the coaxial connector shown in FIG. 1, wherein FIG. 4A is a plan view and FIG.
FIG. 4C is a cross-sectional view, and FIG.

5A and 5B show the socket of the coaxial connector shown in FIG. 1, wherein FIG. 5A is a plan view, FIG. 5B is a front view, and FIG.

FIG. 6 is a cross-sectional view of another embodiment of the coaxial connector according to the present invention.

FIG. 7 is a sectional view showing an example of a conventional coaxial connector.

8 is a cross-sectional view of the coaxial connector as viewed from the direction of arrow A in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 ... Housing 22 ... Bushing 23 ... Socket 24 ... Cylindrical part 29 ... Connection part 29a ... Tongue piece 31 ... Concave part 32 ... Fitting concave part 33 ... Spring contact part 35 ... Spring contact part accommodation hole

Claims (2)

[Claims] A housing having a tubular portion in contact with an outer conductor of the receptacle, the housing being electrically connected to an outer conductor of the coaxial cable; a center conductor of the receptacle being press-fitted and expanding radially outward; A spring contact portion having a substantially C-shaped cross section for pressing against the outer peripheral surface of the center conductor of the receptacle, and being integrally pulled out from the spring contact portion and folded in a direction perpendicular to the central axis direction of the spring contact portion. A bent socket having a connection portion connected to a center conductor of the coaxial cable; and a bushing having a receiving hole for receiving the socket and mounted in a tubular portion of the housing. A coaxial connector characterized by the above-mentioned. 2. The socket according to claim 1, wherein at least two locations on the outer peripheral surface of the spring contact portion of the socket, into which the center conductor of the receptacle is press-fitted and expand radially outward, are in contact with the inner peripheral surface of the housing hole of the bushing. The coaxial connector according to claim 1, wherein: