JP2003109711A - Connection terminal of high frequency equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable to make connection with which high frequency resistance is reduced as well as screwing down of a connection tap seat 6 and a connector 22 is attained, by fastening screw threads with light force. SOLUTION: In the case of connecting a cable by screw-fitting a connection tap seat of a case in a high frequency equipment provided with a high frequency circuit to a connector, a thin formed elastic bent part is provided at an edge line of at the top of a screw thread of either a male or a female screw between the connection tap seat and the connector so as to elastically bend inwardly by being pressed to the valley of the counterpart in the screwing state.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connector for connecting a coaxial cable to a plug seat attached to a case of a high-frequency device having a high-frequency circuit. The present invention relates to a connection terminal of a high-frequency device used for transmitting and receiving a high-frequency signal (for example, a high-frequency signal having a property that requires the use of a coaxial cable such as VHF and UHF). 2. Description of the Related Art FIG. 1 shows an embodiment of the present invention. In FIG.
The configuration related to the code used between the two is a configuration widely known from the past (for example, Japanese Patent Laid-Open No. 58-165285).
Reference). Therefore, a conventional example will be described with reference to FIG. The case 2 of the high-frequency device provided with the above-described conventional high-frequency circuit 3 is provided with a plug seat 6 having an outer conductor 8 and a center conductor 10. The coaxial cable 21 is connected by screwing a connector 22 having an outer conductor 24 corresponding to that of the plug seat 6 and an inner conductor 25, and the high-frequency circuit 3
And a coaxial cable 21 for transmitting and receiving high-frequency signals. In the connection terminal 4 of the conventional high-frequency device, impurities such as oil film and dust are present between the threads in the screwing portion 11 between the plug seat 6 and the connector 22. There is a problem that even if these parts are strongly tightened, a large resistance is generated in high frequency there, and the grounding effect on the braid of the coaxial cable becomes insufficient, and unexpected noise jumps into the high frequency circuit 3. . Therefore, the worker has been instructed to tighten the threaded portion between the plug seat 6 and the connector 22 with a strong force. However, if the tightening is performed with a strong force, there is a problem that the next removal is difficult. Occurred. In addition, sometimes a strong force is applied, so that the connector 22 is damaged. [0005] The connection terminal of the high-frequency device of the present application is provided to solve the above-mentioned problems of the prior art.
The object of the present application is to provide an outer conductor on the case side and a plug seat having a center conductor, and for the plug seat, an outer conductor corresponding to that of the plug seat and an inner conductor. It is an object of the present invention to provide a connection terminal of a high-frequency device in which a coaxial cable is connected by screwing together a connector, and a high-frequency signal can be transmitted and received between the high-frequency circuit and the coaxial cable. Another object is to achieve the purpose of screwing the connection terminals of the high frequency device by tightening the threads between the screw threads with a light force at the screwing portion between the plug seat 6 and the connector 22. It is an object of the present invention to provide a connection terminal of a high-frequency device in which connection is made so that high-frequency resistance can be reduced. The other purpose is that the screwing portion between the plug seat 6 and the connector 22 can be screwed with a small force between the threads to achieve the screwing purpose between the two. It is intended to provide a connection terminal for a high-frequency device having a configuration that is extremely simple and does not increase the manufacturing cost even if the connection is performed such that the electrical resistance is reduced. Things. Other objects and advantages will become more readily apparent from the drawings and the following description associated therewith. According to the present invention, a connection terminal of a high-frequency device according to the present invention includes a case in a high-frequency device provided with a high-frequency circuit, which is provided with an external conductor and a plug seat having a center conductor, The coaxial cable connected to the connector is connected to the plug seat by screwing a connector having an outer conductor corresponding to that of the plug seat and an inner conductor, and the high frequency In a connection terminal of a high-frequency device configured to transmit and receive a high-frequency signal between a circuit and a coaxial cable, a ridgeline at the top of one of the threads of the male screw and the female screw between the plug seat and the connector is provided. In the combined state, a thin elastic bending portion is formed so as to be pressed against the inner surface of the valley portion of the other party and to be elastically bent inward. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention. 1 to 3, reference numeral 1 denotes a high-frequency device. In this, 2 is a high-frequency circuit 3 inside.
(For example, a circuit board for processing a high-frequency signal having a property of being transmitted and received using a coaxial cable such as VHF or UHF), and is generally manufactured using a conductive material such as die casting. It is a case that is formed.
As is well known, the main body 7 of the plug seat 6 has a hollow cylindrical shape and has a male screw 1.
2 comprises an outer conductor 8 around which is provided, an insulating material 9, and a center conductor 10 connected to the high-frequency circuit 3. As is well known, the body 7 of this plug seat is inserted through a through hole provided in the case 2 and is tightly fastened to the hole edge with its own flange portion 13 and nut 14 to obtain a sufficient grounding effect. It has been made to be. However, in order to obtain a sufficient grounding effect, a sufficient grounding means is provided by a known means such as providing another ground connection portion 15 between the main body 7 and the case 2. Further, the case 2 and the outer conductor 8
As is well known, there is a case where it is molded with an integral material. An external conductor 24 having a female screw 20 corresponding to that of the plug seat 6 for the purpose of connecting a coaxial cable 21 for transmitting and receiving the high-frequency signal to the plug seat 6, A connector 22 having an inner conductor 25 elastically contacting the center conductor 10 is screwed. By connecting the coaxial cable 21 to the plug seat 6 by a well-known means using the connector 22, high-frequency signals can be transmitted and received between the high-frequency circuit 3 and the coaxial cable 21. . The male screw 12 and the female screw 20 between the plug seat 6 and the connector 22 have ridges (12a, 20a) and valleys (12b, 20b), respectively, as is well known. In these male screw 12 and female screw 20,
In a state where the plug seat 6 and the connector 22 are screwed together as usual, the peaks (12a, 20a) are formed as shown in FIG.
And the valley (12b, 20b).
Many parts of (c, 20c) are pressed and fixedly fixed between the plug seat 6 and the connector 22. However, in the embodiment of the present invention, FIGS.
As shown in FIG. 2, the thread (for example, the male screw 12 or the female screw 2) of one of the plug seat 6 and the connector 22 is provided.
0) Top (top of mountain) ridge (position indicated by reference numeral 27)
In the screwed state, the other party's valley (12b or 20
The valley (12b or 2b) of the mating part is designed so that the inner surface of b) is pressed by the inner surface of the depression and elastically flexes inward.
An elastic bending portion 27 is formed so as to have a dimension slightly protruding beyond the inner surface of Ob) and having a small thickness so as to obtain elasticity. Reference numeral 28 denotes a missing portion provided to make the elastic bending portion 27 thin. In the above configuration, when the plug seat 6 and the connector 22 are screwed together as shown in FIG. 2, the peaks (12a, 20a) and the valleys (12a,
b, 20b) between the screwing surfaces (12c, 20c)
Are pressed against each other so that the space between the plug seat 6 and the connector 22 is fixedly fixed. In addition, the plug seat 6 or the connector 22
Thread on one or both (e.g., external thread 1
2 or the female screw 20) is pressed against the ridge (indicated by reference numeral 27) at the top (top of the crest) of the female screw 20) by a depression inside the valley (12b or 20b) of the other side in the screwed state and elastically inward. The thin-walled elastic bending portion 27 which is provided so as to bend to the valley (12b or 20)
b) is elastically contacted with the inner surface to form a high-frequency passage which becomes a very good contact surface in terms of high-frequency, and the high-frequency passage between the plug seat 6 and the outer conductor of the coaxial cable 21 connected to the connector 22. This is effective in minimizing the adverse effect on the high-frequency circuit 3 due to noise jumping into the outer conductor of the coaxial cable or noise jumping into the plug seat 6 and the connector 22. Next, FIG. 3 (C) shows the thread (12a or 12a or 12a) on one or both of the plug seat 6 and the connector 22 based on the same idea as in the case of FIG. 3 (B). 20
The ridgeline 27 at the top of a) may be provided with a thin elastic bending portion 27 formed so as to be pressed against the inner surface of the other valley portion (12b, 20b) and elastically bent inward in the screwed state. FIG. 4 is a view showing an example different from the case of FIG. 3B in the shape of the elastic bending portion 27. The elastic bending portion 27 in the figure forms a cutout 28 at the center of the ridgeline 27 at the top of the thread (12a or 20a) and bisects it. Elastic bending portions 27 are formed, each of which compressively intervenes in a valley on the other side so as to elastically contact therewith. Although FIG. 3 shows the case where the spiral ridge provided with the elastic bending portion 27 is formed many times, the spiral ridge is formed two or three times as the spiral ridge. Good. As described above, the connection terminal of the high-frequency device according to the present invention is provided with a connector seat provided with an outer conductor and a center conductor on the case side. Since the coaxial cable can be connected by screwing a connector provided with an outer conductor corresponding to that of the plug seat and an inner conductor, between the high-frequency circuit and the coaxial cable, This has the effect of transmitting and receiving high frequency signals. In addition, in the connection terminal of the high-frequency device,
In the threaded portion between the plug seat 6 and the connector 22, the thread is pressed against the ridge at the top of one of the external thread and the internal thread by the inner surface of the other valley in the threaded state and elastically inward. Since the elastically bent portion is formed to be thin so as to bend flexibly, the high-frequency resistance between the threads is significantly reduced even if the threads are tightened with a small force, thereby reducing the coaxiality. Cables and
The effect of conduction with the high-frequency circuit 3 is increased, the grounding effect on the braid is sufficient, and there is an effect of preventing noise from jumping into the high-frequency circuit 3 through the braid in advance. Further, in the present invention, even if the high-frequency resistance between the threads is remarkably reduced as described above, the structure is such that the ridge at the top of the thread is screwed into the thread. In the state, it is an extremely simple configuration in which an elastic bending portion formed to be thin so as to be elastically bent inward by being pressed against the inner surface of the valley portion of the other party, so the manufacturing cost is extremely low, substantially This has the effect of not increasing costs.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially broken perspective view showing a relationship among a case, a plug seat, and a connector. FIG. 2 is a sectional view showing a relationship between a plug seat and a connector. 3A and 3B are cross-sectional views showing a relationship between a male screw and a female screw between a plug seat and a connector, wherein FIG. 3A is a schematic view, FIG. 3C is an enlarged view, and FIG. The enlarged view which shows the example from which a part and a missing part differ. [Description of Signs] 1 ... High frequency device, 2 ... Case, 3 ... Circuit board, 6 ... Connector seat, 7 ... Main body, 8 ... Outer conductor, 9 ... Insulation material, 10 central conductor, 12 ...
Male thread, 13 ... flange, 14 ... nut, 15 ...
Ground connection part, 20 female screw, 21 coaxial cable, 22 connector, 24 external conductor, 2
5 ... internal conductor, 27 ... elastic bending part, 28 ...
Missing part.

Claims (1)

Claims: 1. A case in a high-frequency device having a high-frequency circuit includes a connector seat having an outer conductor and a center conductor, and a plug is provided for the connector seat. A coaxial cable connected to the connector is connected by screwing a connector provided with an outer conductor corresponding to that of the seat and an inner conductor, and a high-frequency signal is transmitted and received between the high-frequency circuit and the coaxial cable. In the connection terminal of the high-frequency device, the pressing is performed on the ridge of the top of one of the external threads and the internal threads of the male and female threads between the plug seat and the connector, and in the screwed state, on the inner surface of the valley of the other party. A connection terminal for a high-frequency device, characterized in that a thin elastically-flexible portion is formed so as to be elastically bent inward to enhance high-frequency conduction therethrough.