JP3541318B2 - Coaxial connector - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a coaxial connector for connecting a coaxial cable to a connection symmetric object.
[0002]
[Prior art]
Conventionally, in order to connect a coaxial cable to a connection object, a receptacle connector connected to the connection object and a plug connector connected to the coaxial cable are used, and these are fitted to each other. The plug connector has a conductive center contact, a conductive external contact, and an insulator that insulates them (see, for example, JP-A-3-250571 or JP-A-9-298081). The receptacle connector also has a conductive center contact, a conductive external contact, and an insulator that insulates them.
[0003]
The signal flows between the center conductor of the coaxial cable and the connection object through the center contact of the plug connector and the center contact of the receptacle connector. Meanwhile, ground, between the housing of the external conductor and connections symmetry of the cable, it flows through the outer conductor of the outer conductor and the receptacle connector of the plug connector.
[0004]
[Problems to be solved by the invention]
A conventional coaxial connector requires a large number of components because the center contact is provided as a separate component. Furthermore, since many parts need to be assembled, the number of assembly steps is increased. In addition, since a signal or ground flows through many components, a high-frequency signal is reflected due to a connection between components and a step inside each component, so that high-frequency characteristics deteriorate.
[0005]
Therefore, an object of the present invention is to provide a coaxial connector capable of reducing the number of parts and the number of assembling steps and improving high-frequency characteristics.
[0006]
[Means for Solving the Problems]
According to the present invention, in a coaxial connector for connecting a coaxial cable to a connection symmetrical object, a slit having a convex portion on an inner periphery and a tapered portion on an outer periphery and allowing a diameter to expand and contract is formed. A cylindrical metal clamp to be fitted, a metal fastening member having a slope corresponding to the tapered portion, and a metal formed separately from the clamp for engaging and holding the fastening member. An outer member made of a coaxial cable, wherein when the tightening member is engaged with the outer member, the tightening member reduces the diameter of the clamp so that a convex portion is formed on the outer conductor of the coaxial cable, and the outer member electrically connected to and to hold the coaxial cable to the outer member to the outer conductor through the clamp and the fastening member, thereby the middle of the center conductor of the coaxial cable Coaxial connector is obtained is characterized in that so as to connect directly to the connection object using as a contact.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
A coaxial connector according to a first embodiment of the present invention will be described with reference to FIGS.
[0008]
The illustrated coaxial connector is for connecting a coaxial cable 1 to a substrate 2 to be connected. The coaxial cable 1 has a conductive center conductor 3, an insulator 4 surrounding the center conductor 3, and a conductive outer conductor 5 exposed around the insulator 4. The center conductor 3 has an end exposed. In addition, the board | substrate 2 is provided with the electric circuit, accommodated in the metal housing | casing 6, and was fixed.
[0009]
Next, as will be sequentially described, the coaxial connector includes three components: a cylindrical nut 7, a cylindrical clamp 8, and a cylindrical shell 9. The nut 7, the clamp 8, and the shell 9 are all made of metal, and are fitted and mounted on the coaxial cable 1 in this order from the end.
[0010]
As shown in FIG. 3, the clamp 8 has a plurality of wedges or projections 11 that are spaced apart from each other in the axial direction on the inner periphery, and a tapered portion 12 on the outer periphery. The diameter of the tapered portion 12 decreases as the distance from the shell 9 increases. A slit or a slit 13 is formed in the clamp 8 so as to allow its diameter to expand or contract. The slit 13 here extends in the axial direction.
[0011]
As shown in FIG. 4, the nut 7 has a size that fits outside the clamp 8, but has a slope 14 having the same angle corresponding to the tapered portion 12 of the clamp 8. The nut 7 has an internal thread 15 on the inner surface.
[0012]
As shown in FIG. 5, the shell 9 is fixed to the outer surface of the housing 6 with a screw member 16 to become an outer member. The shell 9 is formed with a male screw 17 screwed into the female screw 15 of the nut 7 and a through hole 18 through which a screw member 16 is inserted. The central hole 19 of the shell 9 is formed to have an inner diameter that is the same as or slightly larger than the outer diameter of the insulator 4 of the coaxial cable 1.
[0013]
Next, assembly of the coaxial connector will be described. As shown in FIG. 2, the nut 7, the clamp 8, and the shell 9 are fitted to the coaxial cable 1 in this order, and the shell 9 is fixed to the housing 6 with the screw member 16. Thereafter, the female screw 15 of the nut 7 is screwed into the male screw 17 of the shell 9 as shown in FIG. That is, the nut 7 functions as a fastening member.
[0014]
In the process of tightening the nut 7, the slope 14 of the nut 7 pushes the tapered portion 12 of the clamp 8 inward, so that the clamp 8 is reduced in diameter and the convex portion 11 is hardened by the outer conductor 5 of the coaxial cable 1. Let it go. As a result, the coaxial cable 1 is held on the shell 9 via the clamp 8 and the nut 7. This allows the center conductor 3 of the coaxial cable 1 to be used as the center contact of the connector. Therefore, it is not necessary to use a separate part as the center contact, so that the number of parts and the number of assembly steps can be reduced.
[0015]
The central conductor 3 of the coaxial cable 1 is directly connected to the substrate 2 by soldering . As a result, a signal can flow from the coaxial cable 1 toward the substrate 3 or in the opposite direction. In this case, since the signal flows substantially directly through the center conductor 3 of the coaxial cable 1 to the substrate 2, there is almost no risk of deterioration of the high-frequency characteristics.
[0016]
Since the outer conductor 5 of the coaxial cable 1 is connected to the housing 6 via the clamp 8, the nut 7, the shell 9, and the like, the ground flows from the outer conductor 5 of the coaxial cable 1 to the housing 6 via these. be able to.
[0017]
A coaxial connector according to a second embodiment of the present invention will be described with reference to FIG. Similar parts are denoted by the same reference numerals, and description thereof is omitted.
[0018]
The illustrated coaxial connector is of a bulkhead type, and the shell 9 is fixed to the housing 6 by screwing a screw portion 21. According to this, a screw member for fixing the shell 9 to the housing 6 is unnecessary.
[0019]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a coaxial connector capable of reducing the number of parts and the number of assembling steps and improving high-frequency characteristics.
[Brief description of the drawings]
FIG. 1 is a half sectional side view showing a state after an assembly of a coaxial connector according to a first embodiment of the present invention.
FIG. 2 is a half sectional side view showing a state before assembly of the coaxial connector of FIG. 1;
3A and 3B show a clamp used for the coaxial connector of FIG. 1, wherein FIG. 3A is a front view and FIG. 3B is a half sectional side view.
FIG. 4 is a half sectional side view of a nut used in the coaxial connector of FIG. 1;
5A and 5B show a shell used in the coaxial connector of FIG. 1, wherein FIG. 5A is a front view and FIG. 5B is a half sectional side view.
FIG. 6 is a half sectional side view showing a state after assembling of a coaxial connector according to a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Coaxial cable 2 Substrate 3 Center conductor 4 Insulator 5 Outer conductor 6 Housing 7 Nut 8 Clamp 9 Shell 11 Wedge or convex part 12 Tapered part 13 Slot or slit 14 Slope 15 Female screw 16 Screw member 17 Male screw 18 Through hole 19 Shell Center hole 21 of thread

Claims (1)

In a coaxial connector for connecting a coaxial cable to a connection symmetrical object, a cylindrical shape which has a convex portion on an inner periphery and a taper portion on an outer periphery and has a slit which allows expansion and contraction of a diameter is formed, and is fitted into the coaxial cable. a metal clamp of a metallic fastening member having an inclined surface corresponding to the tapered portion, said clamping member for engaging and holding the, and the clamp consists of a metal outer member formed separately When the tightening member is engaged with the outer member, the tightening member reduces the diameter of the clamp so that a convex portion becomes less tight with the outer conductor of the coaxial cable, and the outer member is clamped and tightened. through member is electrically connected to the outer conductor and to retain the coaxial cable in the outer member, thereby centering contact the center conductor of the coaxial cable Coaxial connector is characterized in that so as to connect directly to the connection object uses.

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