JPH11195444A - Coaxial cable terminating structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a small-sized coaxial cable terminating structure that is used to connect electrically a relatively small diameter coaxial cable to a pin- shaped coaxial-type terminal structure having a diameter larger than that of the coaxial cable. SOLUTION: A coaxial cable terminating structure 10 is used to connect mutually an internal conductor 81 and an external conductor 82 of a coaxial cable 80 that has a relatively large diameter and stretches from a pin-shaped coaxial terminal structure 20 with an internal conductor 71 and an external conductor 72 of a coaxial cable 70 having a relatively small diameter through traces 52, 53 each formed on each of the surfaces of a double-sided board 50, respectively. Thereby, a structure in which the coaxial terminal structure 20 is electrically connected to one end of the coaxial cable 70 having a relatively small diameter can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coaxial cable termination structure including a pin-shaped coaxial terminal structure connected to an end of a coaxial cable, and more particularly to a termination suitable for terminating a small diameter coaxial cable. Regarding the structure.

[0002]

2. Description of the Related Art An example of such a coaxial cable termination structure is disclosed in Japanese Utility Model Laid-Open Publication No. 62-66187. The disclosed termination structure has an internal terminal connected to the center conductor of the coaxial cable, a housing for accommodating the same, and a shell located on the outer periphery of the housing. The assembly is realized. The outer conductor of the coaxial cable is configured to fold outwardly to make electrical contact with the inner surface of the shell. It should be noted that although the diameter of the terminal structure of the coaxial terminal assembly is slightly larger than the diameter of the coaxial cable, it is relatively close to the diameter of the coaxial cable.

[0003]

The terminating structure disclosed in the above-mentioned publication cannot realize terminating a small-diameter coaxial cable having a smaller size than a pin-shaped coaxial terminal structure.

Accordingly, the present invention allows a relatively small diameter coaxial cable to be electrically connected to a pin-shaped coaxial terminal structure which is larger in diameter than the coaxial cable and is used in existing connectors and is easy to handle. An object is to realize a small-sized coaxial cable termination structure.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a coaxial cable termination structure for terminating a coaxial terminal structure having a pin-shaped outer shape at an end of a coaxial cable. The outer conductor and the inner conductor of the large-diameter coaxial cable and the outer conductor and the inner conductor of the relatively small-diameter coaxial cable are connected to the traces formed on each surface of the double-sided board, respectively. It is configured to be interconnected via traces.

Preferably, the double-sided substrate realizes a substantially microstrip structure by the trace.

Preferably, the double-sided board has a rectangular shape, and the trace also has a substantially rectangular shape substantially corresponding to the outer shape of the double-sided board.

Preferably, each of the outer conductor and the inner conductor of the relatively large-diameter coaxial cable and each of the outer conductor and the inner conductor of the relatively small-diameter coaxial cable are connected to an end of the trace. It is arranged and connected so as to extend in the longitudinal direction from the position.

Preferably, the double-sided substrate is provided as a film-like flexible substrate.

Preferably, the connection between the outer conductor and the inner conductor of the relatively large-diameter coaxial cable and the trace is performed by soldering.

Preferably, the connection between the outer conductor and the inner conductor of the relatively small diameter coaxial cable and the trace is made by soldering.

[0012] Preferably, a dielectric material located between the inner conductor and the outer conductor of the relatively large-diameter coaxial cable is placed so as to partially overlap the double-sided board.

[0013] Preferably, a dielectric material located between the inner conductor and the outer conductor of the relatively small-diameter coaxial cable is placed so as to partially overlap the double-sided board.

Preferably, the dielectric of the relatively large diameter coaxial cable and the dielectric of the relatively large diameter coaxial cable are located on the same side of the double-sided board.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a plan view of a cable and terminal assembly having a coaxial cable termination structure according to the present invention.

Referring to FIG. 1, this assembly 10 includes a terminal structure 20 having a pin-shaped outer shape. The terminal structure 20 has a coaxial terminal structure, and is connected to a coaxial cable 70 having a relatively small diameter (for example, # AWG50 or the like). Terminal structure 20
The external terminal 21 constituting the outer shape has a pin-shaped portion 21a and a flange 21b located at the rear end. A tube body 90 such as a heat-shrinkable tube is attached to the rear side of the flange 21 b of the external terminal 21. The details of the internal structure will be described below in order.

FIG. 2 is a view showing the subassembly before the tube body is mounted, and (a), (b) and (c) are a plan view, a front view and a bottom view, respectively. 3A and 3B show a double-sided board used for the subassembly, wherein FIG. 3A is a plan view and FIG. 3B is a front view.

According to FIG. 2, the tube 9 shown in FIG.
The configuration inside 0 is seen. In particular, the position of the tube body 90 is virtually shown in FIG. As shown, a ferrule 22 projects from the rear end of the terminal structure 20,
Further, a coaxial cable 80 having a relatively large diameter (for example, # AWG32 or the like) extends backward. The vicinity of the end of the coaxial cable 80 is stripped to an appropriate size to expose the inner conductor 81, the outer conductor 82, and the dielectric 83. The other end of the inner conductor 81 and the other end of the outer conductor 82 of the coaxial cable 80 are connected to an internal terminal and an external terminal 21 (not shown) inside the terminal structure 20, respectively. The details of the structure are disclosed in Japanese Utility Model Application Laid-Open No. 5-45962, and a detailed description thereof will be omitted.
Is described as a member that fixes and connects the portion near the other end of the external conductor 82 of the coaxial cable 80 with the external terminal 21.

As shown in FIG. 2, a relatively small-diameter coaxial cable 70 is also stripped to an appropriate size to expose its inner conductor 71, outer conductor 72, and dielectric 73. Although the diameters of the coaxial cable 70 and the coaxial cable 80 are different, they have the same characteristic impedance (for example, 50Ω).

As shown, the coaxial cable 70 is connected to the coaxial cable 80 via the double-sided board 50. According to FIG. 3, the double-sided substrate 50 has traces 52 and 53 formed on both surfaces of a resin plate 51 made of, for example, polyimide, which is flexible and has a substantially thin rectangular shape so as to extend in the length direction. Returning to FIG. 2, the inner conductor 81 and the outer conductor 82 of the relatively large-diameter coaxial cable 80 are the inner conductor 71 and the outer conductor 72 of the relatively small-diameter coaxial cable 70, respectively. Interconnected via That is, as shown, the inner conductors 71, 81 are both connected to the trace 52 while the outer conductors 72, 82
Are both connected to a trace 53, thereby realizing an interconnection between the coaxial cables 70,80. Inner conductor 7
1 and 81 and the outer conductors 72 and 82 are
The traces 52 and 53 are connected and fixed by a method such as soldering so as to extend toward the center from both ends of the traces 52 and 53 in the longitudinal direction on the traces 2 and 53. In particular, since a configuration similar to the microstrip structure is realized in the double-sided board 50, the coaxial cables 70, 8 while appropriately maintaining characteristic impedance matching are provided.
It should be noted that the zeros can be interconnected. At this time, it is necessary to appropriately select the thickness and material of the resin plate 51 so as to have a uniform thickness.

In implementing this interconnection, it should be noted that the dielectrics 73 and 83 of the coaxial cables 70 and 80 are located on the same side of the double-sided board 50 (ie, on the side of the trace 52). This is advantageous when the space for accommodating the coaxial cables 70 and 80 is considered.

The tube 90 is attached to the sub-assembly shown in FIG. 2 to complete the termination structure of the coaxial cable shown in FIG. 1. A manufacturing process suitable for mass production is as follows. In the first step of manufacturing, the end of the relatively small diameter coaxial cable 70 is stripped, the inner conductor 71 and the outer conductor 72 are separated, and the inner conductor 71 and the outer conductor 72 are separated from each other.
53 is connected by soldering or the like. In a second step of manufacture (which can be done in parallel with the first step), the assembly of the relatively large diameter coaxial cable 80 and the terminal structure 20 is performed. This is the Japanese Utility Model Reference No. 5-459 mentioned above.
According to a method similar to the method disclosed in JP-A-62-62. In the third step of manufacturing, the extending end of the coaxial cable 80 extending from the component manufactured in the second step is stripped, the inner conductor 81 and the outer conductor 82 are separated, and each is traced on the double-sided board 50. 52 and 53 are connected by soldering or the like. In the subsequent fourth step of manufacturing, the tube body 90
Is attached. The tube body 90 is a completely shrinkable type or a normal heat shrinkable tube. When a normal heat-shrinkable tube is used, it is preferable to fill the adhesive so as to fill a gap created between the coaxial cable 70 having a relatively small diameter and the tube body 90. Thus, it is possible to easily mass-produce a coaxial cable termination structure including a configuration in which the coaxial terminal structure 20 is electrically connected to the end of the relatively small-diameter coaxial cable 70.

As described above, the preferred embodiment of the present invention has been described, but this is merely an example and does not limit the present invention. For example, in the above embodiment, the traces 52 and 53 have substantially the same shape and size, but the pattern may be asymmetrical to optimize the characteristics. Further, the double-sided substrate is not limited to a flexible (or flexible) one, and may be a rigid one.

[0025]

According to the termination structure of the coaxial cable of the present invention, the outer conductor and the inner conductor of the relatively large-diameter coaxial cable terminated to the coaxial terminal structure and the relatively small-diameter coaxial cable are terminated. Each of the outer conductor and the inner conductor is
Since it is configured to be connected to each of the traces formed on each side of the double-sided board and to be interconnected via the traces, a relatively small-diameter coaxial cable can be larger than the coaxial cable. A small-sized coaxial cable termination structure electrically connected to a pin-shaped coaxial terminal structure which is used for an existing connector and is easy to handle with a diameter is realized, and its electric transmission characteristics are also extremely good.

[Brief description of the drawings]

FIG. 1 is a plan view of a cable and terminal assembly having a coaxial cable termination structure according to the present invention.

FIG. 2 is a view showing a sub-assembly before a tube body is mounted, (a), (b) and (c) are plan views, respectively.
A front view and a bottom view.

FIG. 3 is a view showing a double-sided board used for a sub-assembly;
(A) is a plan view, and (b) is a front view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Termination structure (assembly) 20 Coaxial terminal structure 50 Double-sided board 52, 53 Trace 70 Small-diameter coaxial cable 71 Internal conductor 72 External conductor 80 Large-diameter coaxial cable 81 Internal conductor 82 External conductor

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akira Kawaguchi 3-5-8 Hisamoto, Takatsu-ku, Kawasaki City, Kanagawa Prefecture Japan MP Co., Ltd.

Claims (1)

[Claims] 1. A coaxial cable termination structure for terminating a coaxial terminal structure having a pin-shaped outer shape at an end of the coaxial cable, wherein a relatively large-diameter coaxial cable terminated to the coaxial terminal structure is provided. Each of the conductor and the inner conductor, and each of the outer conductor and the inner conductor of the relatively small-diameter coaxial cable,
A termination structure for a coaxial cable, wherein the termination structure is configured to be connected to each of traces formed on each surface of a double-sided board and to be interconnected via the traces.