JPS618864A - Coaxial connector - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a coaxial connector comprising a cylindrical outer conductor and a rod-shaped center conductor provided in a hollow portion within the outer conductor.

[Conventional technology]

Conventionally, a coaxial connector as shown in the cross-sectional view of FIG. 8 has been used for transmitting high frequency signals (for example, I GHz or higher) from one device to another. The coaxial connector 1 shown in this figure consists of a cylindrical outer conductor 2 and a rod-shaped center conductor 3 arranged on the axis of the outer conductor 2. As shown in the figure, the bead 6 is fitted into the small diameter part 5 of the thinned part, and then the center conductor 8 is screwed into the tip threaded part 7, and then the screw formed at the tip of the outer conductor 2 is inserted. A cylindrical outer conductor 10 is screwed into the portion 9 to fix the bead 6 and the center conductors 3 and 8.

[Problem that the invention seeks to solve]

However, since such a coaxial connector 1 fixes the center conductors 3 and 8 to the outer conductors 2 and 10 using the beads 6, it has the following drawbacks.

(a) There are a large number of parts, and in order to minimize cumulative dimensional errors, the dimensional accuracy of each part must be high, resulting in high costs. Furthermore, since there are a large number of parts, the number of assembly steps is also long and the cost is high.

(b) The bead 6 is used to fix the center conductor 3 so that there is little axial deviation from the outer conductor 2 and to make it concentric, but the insulator 11 alone is insufficient for strength, creep, etc. However, since exact dimensions cannot be determined, metal rings 1 are placed on the inner and outer peripheries of the insulator 11, respectively.
It is necessary to have a three-layer structure with 2.13 inserted.

(c) In addition, the inner and outer circumferential surfaces of the insulator 11 are usually
Since they are each fixed to the metal rings 12 and 13 with adhesive, the heat generated by soldering and bonding of the center conductor 3 can cause deformation of the insulator 11, variations in adhesive strength, and deterioration and decrease in adhesive strength due to changes over time. As a result, the center conductors 3 and 8 become easier to rotate.

Further, a similar problem occurs when the center conductor 3 and the center conductor 8 are integrated and fixed directly to the bead 6 with an adhesive.

Therefore, if a rotation stopper is installed between these parts, the characteristic impedance will change in this part and the VSWR will deteriorate.
It becomes necessary to reconsider correction of characteristic impedance.

-1) In order to correct the discontinuity of characteristic impedance due to the difference between the dielectric constant of air and the dielectric constant of the insulator 11, the inner and outer diameters of the inner and outer rings of the bead 6 are changed, -1
Countersbores 14 are inserted into the insulator 11 of the bead 6 from both sides, but if the tolerances of these correction dimensions and the dimensional tolerances of the parts vary, the characteristic impedance will change in proportion to the size of the dimensional tolerances. will change, and the VSWR will deteriorate. The degree of deterioration becomes greater as the frequency becomes higher.

In view of the above circumstances, it is an object of the present invention to provide a coaxial connector that improves the drawbacks described in (a) to (b) above.

[Failure to solve the problem]

In order to achieve this object, the coaxial connector according to the present invention includes a cylindrical outer conductor 22 and a rod-shaped center conductor 23 provided in a hollow portion within the outer conductor.

In the coaxial connector 20, a first hole 31 is formed at a desired location in the center conductor group 23;
The second hole 28 of the outer conductor 22 is formed at a location corresponding to the hole 31 of the outer conductor 22, and the center It is characterized by comprising rod-shaped supports 724 and 257 for fixing the conductor to the outer conductor.

〔Example〕

Hereinafter, the present invention will be explained according to embodiments shown in the drawings.

FIG. 1 is a sectional view of a coaxial connector according to the present invention.
FIG. 2 is a sectional view taken along line A--A in FIG. 1. 1st
In the figure, 20 is a coaxial connector, which as described below includes a cylindrical outer conductor 22, a center conductor 23 inserted into the outer conductor 22, and a center conductor 23 inserted into the outer conductor 22.
A support 24.2 consisting of first and second insulating members that fixes the
5.

The outer conductor 22 has a connecting portion 26 having a small outer diameter formed on the outer peripheral surface of the distal end so that the distal end thereof can be connected to a connected device (not shown). First and second through holes 28.2 completely penetrate through the outer peripheral surface and inner peripheral surface of the portion in a direction perpendicular to the axis 27.
9 are formed, and these first and second through holes 28.2
The first and second insulators 24 and 25 are fitted into the holes 9, respectively.

Further, the center conductor 23 has a connecting pin 30 formed at its tip so that the tip side thereof can be connected to the connected device. A fitting hole 31 is formed in a direction perpendicular to the core 27. As shown in the cross-sectional perspective view in FIG. 3 and the perspective view in FIG. The first support 24 is fitted into one end, and the second support 25 is fitted into the other end.

The first support 24 is formed in the shape of a round bar as a whole, and is composed of first and second insulators 34 and 35. The first insulator 34 has a round bar-shaped protrusion 36 formed at one end (lower end in FIG. The tip of the second insulator 35 is fitted into the circular recess 37 . The second insulator 35 is integrally formed with a round bar-shaped protrusion 38 that is fitted into the circular recess 37 and a body 3 that is fitted into the first through hole 28. It is fitted into the through hole 28 of the mud 1 and the fitting hole 31 integrally with the first insulator 34 .

Further, the second support 25 is composed of a first insulator 34a and a second insulator 35a, like the first support 24, and these first and second insulators body 34
a'+35a is fitted into the second through hole 29 and the fitting hole 31 together. When assembling the coaxial connector of the present invention, first, the round bar-shaped protrusion 36.36a of the first insulator 34.34a is press-fitted into the hole of the center conductor, and then the center conductor is inserted into the hollow part of the outer conductor. Insert j. Next, the hole 28.2 in the outer conductor
9 and the center conductor hole 31 until their axes align with each other. Next, the tip of the second insulator 35° 35a is pressed from the outside of the extranuclear conductor into the circular recess 37.37a provided in the first insulator 34.34a and bonded with adhesive. Assembling. Further, the other ends of the outer conductor and the center conductor may be electrically connected to another circuit by solder welding or the like, or may be connected in a conventional manner.

Therefore, in this embodiment, the following effects can be obtained.

(1) A small insertion hole 31 and a through hole 28.29-i are formed in the center conductor 23 and the outer conductor 22, respectively, and a first
, the second support 24.25 is fitted to the central conductor 2.
3 is fixed to the outer conductor 22, the number of parts can be kept small, and the number of assembly steps can be reduced to reduce costs. Further, by reducing the number of parts, cumulative dimensional errors can be minimized.

(■) On the outer peripheral surface of the center conductor 23 (due to skin effect)
Only recessed portions 32 and 33 having extremely small flat portions are formed in the portions where high-frequency current flows.

As a result, the dimensional discontinuity of the transmission path is extremely small9, and even in a high frequency range that was previously considered impossible, VSW
Can be used as a connector with good radius.

@) Since the characteristic impedance of the part where the support 24.25 is provided is determined by the dimensions of the recess 32.33 of the center conductor 23 and the diameter and length of the insulator 24.25, the characteristic impedance can be changed just by adjusting these. Corrections can be made.

First insulator 34.34a on the center conductor 23,
the first insulator 3 from outside the outer conductor 22.
4.34 Since the second insulator 35°35ak is fitted over a to fix the center conductor 23 to the outer conductor 22, it prevents them from shifting in the axial direction and also serves as a rotation stopper to ensure their fixation. can be made into something.

Furthermore, in this embodiment, since the center conductor 23 is provided with recesses 32 and 33, the first insulators 34 and 34a can be accommodated better.

FIG. 5 is a sectional view showing the second embodiment of the coaxial connector according to the present invention. The coaxial connector 40 shown in this figure is the first
The difference from what is shown in the figure is that the first through hole 2 of the outer conductor 22
A round bar-shaped support 41 is inserted from 8, and this support 41
The small diameter portion 42 formed at the tip of the outer conductor 23 is inserted into the insertion hole 31 of the center conductor 23, and then the second through hole 2 of the outer conductor 22 is inserted.
The tip of the small diameter portion 42 is caulked by inserting a jig from 9 on.

Even if the center conductor 23 is fixed to the outer conductor 22 by one support 41 in this way, the same effect as in the first embodiment described above can be obtained.

6 are cross-sectional perspective views showing a third embodiment of the coaxial connector according to the present invention. Coaxial connector 50 shown in this figure
is different from that shown in FIG. 1 in that first and second supports 24, 25 are provided so that the outer conductor 22 can be separated into the outer conductor main body 22a side and the outer conductor body 22b side at a portion. The first and second supports 24 and 25 are each integrally formed. In this way, it is possible to obtain the same effects as those of each of the embodiments described above, and also to simplify the assembly.

Further, in each of the embodiments described above, the recesses 32 and 33 having flat parts are formed in the center conductor 23, but as shown in the perspective view of FIG. 7, only the insertion hole 31 is formed in the center conductor 23, The discontinuous portion formed on the outer peripheral surface of the center conductor 23 may be made extremely small.

〔effect〕

As explained above, in the coaxial connector according to the present invention, the center conductor and the outer conductor are connected in the radial direction and fixed by at least one rod-shaped insulator, so that the above-mentioned (I) to ( The following effects can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a first embodiment of a coaxial connector according to the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1,
3 is a cross-sectional perspective view of the first embodiment, FIG. 4 is a perspective view showing an example of the center conductor in the first embodiment, and FIG. 5 is a cross-sectional view showing a second embodiment of the coaxial connector according to the present invention. figure,
FIG. 6 is a cross-sectional perspective view showing a third embodiment of the coaxial connector according to the present invention, FIG. 7 is a perspective view illustrating a fourth embodiment of the coaxial connector according to the present invention, and FIG. 8 is a conventional coaxial connector. FIG. 9 is an exploded perspective view of this coaxial connector.

Claims (1)

[Claims] In a coaxial connector (20) consisting of a cylindrical outer conductor (22) and a rod-shaped center conductor (23) provided in a hollow portion within the outer conductor: a first hole (31) formed in the outer conductor (22) at a position corresponding to the first hole;
8, 29); and a rod-shaped support (24, 25) made of an insulator that is inserted into the first and second holes and fixes the center conductor at the center axis position of the outer conductor. A coaxial connector characterized by: