JPH0329138B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a coaxial connector for transmitting high-frequency signals, which comprises a cylindrical outer conductor and a rod-shaped center conductor provided in a hollow portion within the outer conductor. Regarding.

[Conventional technology]

As a coaxial connector used to transmit a high frequency signal (for example, 1 GHz or more) from one device to another, a coaxial connector as shown in the cross-sectional view of FIG. 6 has conventionally been used. 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.
The diameter of the tip of the center conductor 3 is made thin as shown in the exploded perspective view of FIG. The beat 6 and the center conductors 3 and 8 are fixed by screwing a cylindrical outer conductor 10 into a threaded portion 9 formed at the tip of the outer conductor 2.

[Problem that the invention seeks to solve]

By the way, this kind of coaxial connector 1 is Beat 6
Since the center conductors 3 and 8 are fixed to the outer conductors 2 and 10 by means of the following methods, there are drawbacks as described below.

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

(b) The bead 6 is used to fix the center conductor 3 to the outer conductor 2 so that there is no deviation in the axial direction and so that the center conductor 3 is concentric with the outer conductor 2, but if the insulator 11 is used alone, there are problems with strength, creep, etc. Because of this, it is not possible to obtain exact dimensions, so
Metal rings 12 and 13 on the inner and outer peripheries, respectively.
It is necessary to have a three-layer structure in which the

(c) In addition, since the inner and outer circumferential surfaces of the insulator 11 are usually fixed to the metal rings 12 and 13 with adhesive, the insulator 11 is deformed due to heat caused by soldering or bonding of the center conductor 3. The center conductors 3 and 8 become susceptible to rotation due to variations in adhesive strength, deterioration due to changes over time, and a decrease in adhesive strength. 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 provided between these parts, the characteristic impedance will change in this part and the VSWR will deteriorate, so it will be necessary to reconsider correction of the characteristic impedance.

(d) 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, and the bead 6 Insulator 1
However, 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, and the VSWR
will get worse. The degree of deterioration becomes greater as the frequency becomes higher.

In view of the above circumstances, this invention has been made as described in (a) to (d) above.
The object of the present invention is to provide a coaxial connector that has improved the drawbacks mentioned above.

[Means for solving problems]

To achieve this purpose, the coaxial connector for high frequency signal transmission according to the present invention has a cylindrical outer conductor 2
2 and a rod-shaped center conductor 23 provided in a hollow portion within the outer conductor, a first hole 31 is formed to penetrate through the center conductor 23 in a diametrical direction at a desired location; , the outer conductor 2
2, second holes 28 and 29 are formed to penetrate in the diametrical direction at positions corresponding to the first hole 31; The protrusion is fitted, and the outer end surface is the outer conductor 22.
The pair of first insulators 34, 34a are in contact with the inner circumferential wall surface of the cavity portion of the body, and the second holes 28, 29 are fitted into the opposing openings of the pair of first insulators 34, 34a.
a pair of second insulators 35, 35a that fit into recesses provided in the outer end surfaces of the insulators, and between the inner wall of the outer conductor 22 and the outer wall of the center conductor 23, The device is characterized in that the second insulator portion is hollow except for the second insulator portion.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 is a sectional view of a coaxial connector according to the present invention, and FIG. 2 is a sectional view taken along line A--A in FIG. In FIG. 1, reference numeral 20 denotes a coaxial connector for high frequency transmission, which includes a cylindrical outer conductor 22, a center conductor 23 inserted into the outer conductor 22, and a central conductor 23 inserted into the outer conductor 22, as described below. It is configured to have first and second supports 24 and 25 made of insulating members, which fix the center conductor 23.

The outer conductor 22 has a connecting portion 26 having a small outer diameter on the outer circumferential surface of the distal end so that the distal end thereof can be connected to a connected device (not shown), and is located a distance l rearward from the distal end. First and second through holes 2 as second holes penetrating the outer peripheral surface and the inner peripheral surface in a direction perpendicular to the axis 27 in the part.
8 and 29 are formed, and the first and second supports 2 are formed in these first and second through holes 28 and 29.
4 and 25 are respectively fitted.

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, and the center conductor 23 has a connecting pin 30 formed at the tip thereof, and a distance l from the tip is located behind the center conductor 23. A fitting hole 31 as a first hole is formed in a direction perpendicular to 27. The insertion hole 31 is shown in the cross-sectional perspective view of FIG.
As shown in the perspective view of the figure, recesses 32 and 33 are formed at both ends of the recesses 32 and 33, each having a flat portion partially cut out from the center conductor 23, and one end of the recesses 32 and 33 having a flat portion cut out from the central conductor 23 is formed at one end of the recesses 32 and 33. The support 24 is fitted, and the second support 2 is fitted on the other end opening side.
5 is inserted.

The first support 24 is formed into a round rod shape as a whole, and includes first and second insulators 34 and 35.
It consists of The first insulator 34 has a round bar-shaped protrusion 36 formed at one end (lower end in the figure) to be fitted into the insertion hole 31, and a circular recess 37 formed at the other end. 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 portion 39 that is fitted into the first through hole 28. 1 insulator 34
The first through hole 28 and the insertion hole 31 are integrated with the first through hole 28 and the insertion hole 31.
It is inserted into the.

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 34a and 35a are integrally fitted into the second through hole 29 and the fitting hole 31. When assembling the coaxial connector of the present invention, first the first insulators 34, 34 are assembled.
The center conductor 23 is inserted into the hollow portion of the outer conductor 22 with the round rod-shaped protrusions 36, 36a of the center conductor 23 being press-fitted into the opposing openings of the insertion hole 31 of the center conductor 23. Next, it is inserted until the axes of the first and second through holes 28 and 29 as the second hole of the outer conductor and the insertion hole 31 as the first hole of the center conductor match. Next, a second insulator 3 is inserted into the circular recesses 37, 37a provided in the first insulators 34, 34a.
5 and 35a are press-fitted from the outside of the outer conductor 22 and bonded with adhesive for assembly. 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.

() A small insertion hole 31 and first and second through holes 28 and 29 are formed in the center conductor 23 and outer conductor 22, respectively, and first and second supports 24 and 2 are formed in these.
5 and connect the center conductor 23 to the outer conductor 22.
Since it has a simple structure in which it is fixed to the holder, the number of parts can be kept to a small number, and the number of assembly steps can be reduced, thereby reducing costs. Additionally, cumulative dimensional errors can be minimized by reducing the number of parts.

() Only recesses 32 and 33 having extremely small flat parts are formed on the outer circumferential surface of the center conductor 23 (the part where high frequency current flows due to the skin effect). This minimizes dimensional discontinuities in the transmission path. It can be used as a connector with good VSWR even in a high frequency range that was previously considered impossible.

() The characteristics of the portion where the first and second supports 24 and 25 are provided are that the impedance is the size of the recesses 32 and 33 of the center conductor 23 and the dimensions of the first and second supports 24 and 25 which are insulators. Since it is determined by the diameter and length, the characteristic impedance can be corrected simply by adjusting these.

() First insulator 34, 34a on center conductor 23
and then insert the second insulators 35, 35 into the first insulators 34, 34a from outside the outer conductor 22.
Since the center conductor 23 is fixed to the outer conductor 22 by inserting the center conductor 23 into the outer conductor 22, it is possible to prevent these from shifting in the axial direction and to also serve as a rotation stopper to ensure their fixation.

Further, in this embodiment, the recess 3 is provided in the center conductor 23.
2, 33, the first insulator 34,
34a can be accommodated better.

In addition, in the embodiment described above, the center conductor 2
Although recesses 32 and 33 having flat parts are formed in the center conductor 23 as shown in the perspective view of FIG.
It is also possible to form only the insertion hole 31 in the center conductor 23 so that the discontinuous portion formed on the outer peripheral surface of the center conductor 23 is minimized.

〔effect〕

As explained above, according to the high-frequency signal coaxial connector according to the present invention, the tips of the pair of first insulators 34, 34a are inserted into the opposing openings of the first hole 31 that penetrates the center conductor 23 in the diametrical direction. After fitting the protrusion and inserting the center conductor 23 into the cavity in the outer conductor 22, a pair of second
The insulators 35, 35a are fitted, and the tips of the second insulators 35, 35a are fitted and fixed into the recesses provided on the outer end surfaces of the first insulators 34, 34a. As a result, assembly is easy and accurate, and the number of parts is small.
Costs can be reduced by reducing the number of assembly steps, and cumulative dimensional errors can be minimized by reducing the number of parts. Further, it is possible to prevent the outer conductor 22 and the center conductor 23 from shifting in the axial direction and rotational direction, and the fixation can be ensured.

In addition, excluding the first and second insulator parts,
Since there is a cavity between the outer conductor 22 and the center conductor 23, it can be used as a connector with good VSWR even in a high frequency range that was previously considered impossible, and the characteristic impedance can be easily corrected. .

[Brief explanation of drawings]

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, and FIG. 3 is a sectional perspective view of the first embodiment. 4 is a perspective view showing an example of the center conductor in the first embodiment, FIG. 5 is a perspective view illustrating another embodiment of the coaxial connector according to the present invention, and FIG. 6 is an example of a conventional coaxial connector. A cross-sectional view showing
FIG. 7 is an exploded perspective view of this coaxial connector. 20... Coaxial connector, 22... Outer conductor, 23
... Center conductor, 24, 25 ... First and second supports, 28, 29 ... First and second holes as second holes
through hole, 31...insertion hole as the first hole, 3
4, 34a...first insulator, 35, 35a...
Second insulator.

Claims (1)

[Scope of Claims] 1. In a coaxial connector 20 consisting of a cylindrical outer conductor 22 and a rod-shaped center conductor 23 provided in a hollow portion inside the outer conductor, a diametrical conductor is attached to a desired location of the center conductor 23. a first hole 31 formed through the outer conductor 22, and second holes 28, 29 formed through the outer conductor 22 in a diametrical direction at positions corresponding to the first holes; A protrusion protruding from the tip surface is fitted into the opposing opening of the hole 31, and the outer end surface is connected to the outer conductor 22.
The pair of first insulators 34, 34a are in contact with the inner circumferential wall surface of the cavity portion of the body, and the second holes 28, 29 are fitted into the opposing openings of the pair of first insulators 34, 34a.
a pair of second insulators 35, 35a that fit into recesses provided in the outer end surface of the insulator, and the inner wall of the outer conductor 22 and the center conductor 23
A coaxial connector for high frequency signal transmission, characterized in that there is a cavity between the outer walls except for the first and second insulator parts.