JP2571132Y2 - Coaxial connector - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a coaxial connector.
In particular, even in a high-temperature environment (high-temperature environment conditions), there is no deterioration in performance such as high-frequency transmission loss and fluctuation of characteristic impedance, and it can be used for transmitting and receiving high-frequency signals from DC to about 10 GHz band. It relates to a coaxial connector.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional example of a coaxial connector.
This coaxial connector has a metal shell 110,
It comprises a central contact 120, a contact ring 130, and insulators 140 and 150 made of synthetic resin. The longitudinal center of the center contact 120, about half of the ring cross section diameter of the contact ring 130 has fits groove is only set, the contact ring in the groove 13
0 is attached to form a flange portion. Insulators 140 and 150 are respectively fitted to the outer periphery of the center contact 120 from both sides of the flange portion to clamp the contact ring 130, and the center contact 120 is attached to the insulator 14.
0, 150 and are locked together. Then, an integrated product of the center contact 120, the contact ring 130, and the insulators 140 and 150 is inserted into the inner peripheral surface of the shell 110, and the insulator is inserted into the small-diameter portion 111 formed at one end of the inner peripheral surface of the shell 110. The outer diameter part 151 of 150 is abutted. In this state, the caulking portion 112 at the other end of the inner peripheral surface of the shell 110 is plastically deformed in the inner diameter direction to have a smaller diameter than the outer diameter of the insulator 140.
Lock.

At both ends of the shell 110, screw portions 113 for fixing screws to a mating connector are provided.
Contact pieces 121 for contacting the contacts of the mating connector are provided at both ends of the connector 20 so that the mating connector can be connected to transmit and receive electric signals. As the insulators 140 and 150, for example, a fluororesin or a heat-resistant synthetic resin (for example, tetrafluoroethylene resin) is used.

[0004]

[Problems to be solved by the invention] However, even when the above heat-resistant synthetic resin is used as the insulator,
When the temperature is as high as about 200 ° C., the resin does not function as an insulator due to softening or melting of the resin. For this reason, the conventional connector described above cannot be used under high temperature environmental conditions due to deterioration of the insulator inside the connector.

In addition, the characteristic impedance of the connector transmission line fluctuates as the temperature rises, for example, because the relative dielectric constant of the insulator increases with temperature, and the transmission loss in high-frequency characteristics increases with the temperature. For example, 10
There is also a problem that transmission and reception of a high-frequency signal in a GHz band becomes difficult.

Therefore, a technical problem of the present invention is to solve the above-mentioned disadvantages of the prior art and to provide a coaxial connector having excellent high-frequency characteristics even in a high-temperature environment.

[0007]

According to the present invention, there is provided a coaxial connector having a center conductor, an insulator mounted on an outer periphery of the center conductor, and an outer conductor mounted on an outer periphery of the insulator. The insulator is made of ceramics and
While fixing the center conductor to the outer conductor,
Interposed between the core conductor and the outer conductor;
The outer conductor is electrically insulated from the outer conductor.
An air layer is formed between the body and the outer conductor, between the insulator and the center conductor, and between the insulator and the outer conductor, at least between the insulator and the outer conductor. A coaxial connector characterized by being provided is obtained.

According to the present invention, the coaxial connector has
The insulator has a tapered portion formed on the outer periphery and an end portion.
A fixed portion consisting of a circular flat surface formed in
A locking piece with the conductor, a center hole in which the center conductor is mounted,
Coaxial connector is obtained, characterized in that it is composed of.

[0009]

By fixing the center conductor to the outer conductor and using an insulator made of ceramics having excellent heat resistance as an insulator for electrically insulating them, performance deterioration in a high-temperature environment can be suppressed.

Further, by providing an air layer between at least one of the insulator and the center conductor and between the insulator and the outer conductor, even when the relative dielectric constant of the insulator increases with an increase in temperature. Since the relative dielectric constant of the air layer has little variation, the variation of the composite relative dielectric constant of the insulator and the air layer can be suppressed to a small value. Therefore, even in a high-temperature environment, deterioration of high-frequency characteristics such as high-frequency transmission loss and characteristic impedance in the connector transmission line can be substantially eliminated. In addition, the air layer also has the effect of reducing heat conduction and increasing thermal insulation.

Further, by forming the insulator into a substantially conical shape having a tapered portion on the outer periphery, the occurrence of discontinuous capacitance in the connector transmission line is minimized, and characteristics particularly at the time of high frequency transmission are improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1A and 1B are sectional views showing a coaxial connector according to an embodiment of the present invention, and FIG. 2 is a perspective view of a center conductor and an insulator constituting the coaxial connector of FIG. Referring to FIGS. 1 and 2, the coaxial connector of the embodiment of the present invention
A center conductor 2, an insulator 1 provided on each side of the center conductor 2, and an external conductor 3 provided outside the insulator 1.
And a ring 6 for locking. Air layers 4 are formed between the center conductor 2 and the insulator 1, between the insulator 1 and the outer conductor 3, and between the center conductor 2 and the outer conductor 3, respectively.

The center conductor 2 is a substantially cylindrical one formed by plating a conductive metal, for example, beryllium copper with silver.
A large-diameter flange portion 21 is provided at the center. Further, cylindrical contact pieces 22 are formed on both sides of the center conductor 2, and the ends of the contact pieces 22 are hollow and slits are formed on the outer peripheral surface. As will be described later, the contact piece 22 is for engaging with the contact 52 of the mating connector 5 for conduction.

The insulator 1 serves to lock the center conductor 2 to the outer conductor 3 and to electrically insulate them from each other, and is made of a heat-resistant ceramic molded body. The insulator 1 has a tapered portion 1 formed on the outer periphery.
1, a fixed portion 1 formed of a circular flat surface formed at an end portion
2, a conical piece comprising a locking piece 13 with the outer conductor 3 and central holes 14 respectively mounted on the outer periphery of both ends including the contact piece 22 of the center conductor 2. )
, Have substantially the same thickness as shown by the broken line, and a conical space is formed inside.

The outer conductor 3 is substantially hollow cylindrical and has an inner peripheral surface 31 on which the center conductor 2 and the insulator 1 are mounted.
3 is a locking portion 3 formed of a convex piece formed at the left end.
2, the inner peripheral surface 31 includes a press-fit fixing portion 33 of the ring 6 formed by the uneven portion formed at the right end in the figure, and a coupling portion 34 formed by a thread groove formed on the outer peripheral surface.

The ring 6 is annular and comprises a press-fitting portion 61 provided on the inner peripheral surface 31 provided on the outer peripheral surface thereof, and a locking portion 62 provided on the left end surface in the figure.

The mating connector 5 includes an external conductor 54,
Insulator 53, insulator 5 provided inside outer conductor 54
3 includes a pin-shaped contact 52 fixed to the center of the contact piece 22 and a coupling portion 51 formed of a thread groove formed on the inner peripheral surface of the open end of the outer conductor 54. You.

In the coaxial connector of this embodiment, the insulators 1 are respectively attached to the center flange portions 21 from the contact pieces 22 on both sides of the center conductor 2. At this time, as shown in FIG. 3, the two insulators 1 have their fixing parts 12 opposed to each other, the center conductor 2 is inserted into the middle part thereof, and
1 so that the fixing portion 12 is located on the flange portion 21 side (center side P) of the center conductor 2 and the locking portion 13 is located on the contact piece 22 side (outside Q). Becomes

The integrated piece of the center conductor 1 and the two insulators is locked on the inner peripheral surface 31 of the outer conductor 3 by the locking portion 32 from the opening on the right side in FIG. Insert up to. Next, the ring 6 is inserted from the opening on the right side into the inner peripheral surface 31 until the press-fit portion 61 is press-fitted and fixed to the press-fit fixing portion 33. As a result, a structure in which the integral body of the insulator 1 and the center conductor 2 is locked by the locking pieces 13 and the ring 6 and does not come off.

In this embodiment, the center conductor 2 and the insulator 1 are slightly floated so that the insulator 1 does not come off from the center conductor 2 (floating).
It has become. With such a floating structure, when the external conductor 3 is screwed inside the mating connector 5 and connected, the contact piece 22 of the center conductor 2 becomes slightly movable in the axial direction. Thereby, the contact piece 22
Is allowed to move relative to the contact 52 of the mating connector 5, and the contact piece 22 and the contact 52 can be reliably connected.

FIG. 4 illustrates various shapes of the insulator 1 used in the embodiment of the present invention. FIG. 4A shows the insulator 1 described in the above embodiment. FIG. 4B shows an insulator 1 in which fin-shaped protruding pieces are provided outside the tapered portion 11 and the height from the center P to the outside Q is substantially the same. Further, FIG. 4C shows a cylindrical portion 15 at the center of the inside of FIG.
The insulator 1 is provided with a fin-shaped protruding piece 16 on the cylindrical portion 15 and connected to the tapered portion 12 on the outer periphery. FIG. 4D shows an insulator 1 in which a fin-shaped protruding piece 16 is provided outside a cylindrical portion 15 provided at the center, and the outer periphery of the protruding piece 16 is a tapered portion 12.

[0023]

Effect of the Invention As described above, according to the coaxial connector of the present invention, deterioration of performance in a high-temperature environment can be suppressed by using a ceramic material having excellent heat resistance as an insulator. In addition, the center conductor and the outer conductor
During, between the insulator and the center conductor, and by providing an air layer at least between the insulator and the outer conductor of the between the insulator and the outer conductor, the variation of the dielectric constant in the connector transmission line Since it is small, high-frequency characteristics hardly deteriorate even in a high-temperature environment. And for this reason, DC
A coaxial connector that can be used at frequencies up to the GHz band can be provided.

[Brief description of the drawings]

FIGS. 1A and 1B are cross-sectional views showing an embodiment of a coaxial connector according to an embodiment of the present invention.

FIG. 2 is a perspective view of a center conductor and an insulator constituting the coaxial connector of FIG. 1;

FIG. 3 is an explanatory view of a combined state of a center conductor and an insulator in the coaxial connector according to the embodiment of the present invention.

FIGS. 4A to 4D are perspective views each illustrating an insulator used in the coaxial connector of the present invention.

5A is a cross-sectional view of a conventional coaxial connector, and FIG.
Is a side view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulator 2 Center conductor 3 Outer conductor 4 Air layer 5 Mating connector 6 Ring 11 Taper part 12 Fixing part 13 Locking piece 21 Flange part 22 Contact piece 31 Inner peripheral surface 32 Locking part 33 Press-fit fixing part 34 Joining part 51 Coupling part 52 Contact 61 Press-fit part 62 Lock part

Claims (2)

(57) [Scope of request for utility model registration] 1. A coaxial connector having a center conductor, an insulator mounted on an outer periphery of the center conductor, and an outer conductor mounted on an outer periphery of the insulator, wherein the insulator is a ceramic.
Mixed, and the center conductor is fixed to the outer conductor.
Between the center conductor and the outer conductor.
The center conductor and the outer conductor are electrically insulated.
At least one of the insulator and the outer conductor between the center conductor and the outer conductor, between the insulator and the center conductor, and between the insulator and the outer conductor.
A coaxial connector characterized in that an air layer is provided between the body and the body . 2. The coaxial connector according to claim 1, wherein
The insulator has a tapered portion formed on the outer periphery and a shape at the end.
A fixed portion formed of a circular flat surface and the outer conductor
And the central hole in which the center conductor is mounted
A coaxial connector characterized by being constituted .