JP2010080213A - Coaxial cable fixing mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coaxial cable fixing mechanism capable of stably transmitting a high-frequency signal. <P>SOLUTION: In the coaxial cable fixing mechanism for fixing a coaxial cable 3 connected with a transmission line 7 on a base board 5, a coaxial cable fixing member 1 has a coaxial cable insertion hole 1B for inserting the coaxial cable 3, and a counterbore part 1D formed by boring a peripheral part of an opening of the coaxial cable insertion hole 1B. The coaxial cable 3 inserted into the coaxial cable insertion hole 1B is soldered on the counterbore part 1D while an external conductor 3C is exposed, the external conductor 3C is fixed on the coaxial cable fixing member 1, and an internal conductor 3A of the coaxial cable 3 is connected with the transmission line 7. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a coaxial cable fixing mechanism that fixes a coaxial cable that transmits a high-frequency signal to a substrate.

  A coaxial cable is a type of electric wire with a specified characteristic impedance (for example, 50Ω or 75Ω) for transmitting an unbalanced electrical signal. It is a connection between a television receiver or a radio and an antenna, a connection with a measuring device, It is used for various applications such as transmission of audio and video signals, and various techniques are known as a mechanism for fixing the coaxial cable to a substrate (hereinafter referred to as “coaxial cable fixing mechanism”) (for example, (See Patent Documents 1 and 2).

6A and 6B are views showing the appearance of a conventional coaxial cable fixing mechanism, where FIG. 6A is a top view, and FIGS. 6B and 6C are side views of the coaxial cable fixing member viewed from the long side and the short side, respectively. FIG. In the conventional coaxial cable fixing mechanism shown in the figure, a coaxial cable is inserted into the coaxial cable insertion hole 1B, and a fixing screw is inserted into the fixing screw insertion hole 1A formed in the coaxial cable fixing member 1 from above. The slit portion 1C is tightened, and the coaxial cable inserted into the coaxial cable insertion hole 1B is fixed to a substrate, a housing, or the like.
JP 2002-352922 A JP 2005-236648 A

  However, the above-described coaxial cable fixing mechanism has a structure in which the coaxial cable is fixed by tightening the slit portion 1C. Therefore, in order to reliably fix the coaxial cable, the outer dimensional accuracy of the coaxial cable and the dimensional accuracy of the slit portion 1C are required. It becomes. Therefore, when both dimensional accuracy cannot be maintained, there is a possibility that the coaxial cable is not sufficiently fixed, or the coaxial cable is tightened more than necessary and deformed. Further, when the coaxial cable is not sufficiently fixed, the state becomes mechanically unstable, and the high frequency GND becomes unstable electrically, so that the signal to be transmitted becomes unstable. Further, when the coaxial cable is deformed by applying an excessive force, it causes mechanical damage to the coaxial cable and electrically changes the characteristic impedance, and the signal to be transmitted becomes unstable. The same applies to other coaxial cable fixing mechanisms.

  In view of the above-described problems of the prior art, an object of the present invention is to provide a coaxial cable fixing mechanism that enables stable transmission of a high-frequency signal.

  A coaxial cable fixing mechanism according to the present invention is a coaxial cable fixing mechanism for fixing a coaxial cable connected to a transmission line on a substrate, wherein the coaxial cable fixing member is a coaxial cable insertion for inserting the coaxial cable. And a counterbore part formed through the peripheral portion of the opening of the coaxial cable insertion hole, and the coaxial cable inserted into the coaxial cable insertion hole with the outer conductor exposed. The outer conductor is fixed to the coaxial cable fixing member, and the inner conductor of the coaxial cable is connected to the transmission line.

  A coaxial cable fixing mechanism according to the present invention includes a substrate having a transmission line connected to an inner conductor of a coaxial cable, a casing to which the substrate is fixed, and the coaxial cable fixed to the casing. A coaxial cable fixing mechanism, wherein the coaxial cable fixing member includes a coaxial cable insertion hole for inserting the coaxial cable, and at least the board side of the coaxial cable insertion hole. And a counterbore part having an end formed in a concave shape, the coaxial cable inserted through the coaxial cable insertion hole at the position of the counterbore part. The outer conductor is in a state where the inner conductor is exposed at the position of the transmission line, and the outer conductor and the coaxial cable fixing member are half-finished at the counterbore portion. While it is attached, and wherein said the inner conductor is soldered to the transmission line in the substrate.

  ADVANTAGE OF THE INVENTION According to this invention, the coaxial cable fixing mechanism which enables the stable transmission of a high frequency signal is provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a view showing an appearance of a coaxial cable fixing member 1 constituting a coaxial cable fixing mechanism according to an embodiment of the present invention, wherein (a) is a top view, and (b) and (c) are coaxial cables. It is the side view which looked at the fixing member 1 from the long side and the short side. As shown in the drawing, the coaxial cable fixing member 1 is inserted with a fixing screw insertion hole 1A for inserting a fixing screw 2 and a coaxial cable 3 for fixing the coaxial cable fixing member 1 to an object to be fixed. A coaxial cable insertion hole 1B is formed, and a counterbore part 1D is formed so that the peripheral portion of the coaxial cable insertion hole 1B is cut out from the upper surface side of the coaxial cable fixing member 1 so that the end is concave. The diameter of the coaxial cable insertion hole 1 </ b> B is a dimension having a sufficient margin with respect to the outer dimension of the coaxial cable 3. The counterbore 1D is a space for soldering the coaxial cable 3 to the coaxial cable fixing member 1 (clamp). For example, the counterbore 1D is formed by cutting through at least one peripheral portion of the opening of the coaxial cable insertion hole 1B. good. Here, in order to fix the coaxial cable 3 more reliably, it is formed at both the entrance and the exit, but it may be formed only on the substrate 5 side. The coaxial cable fixing member 1 is made of copper, brass or the like for soldering the coaxial cable 3.

  2A and 2B are cross-sectional views showing the structure of the coaxial cable 3, wherein FIG. 2A is a cross-sectional view taken along the central axis of the coaxial cable, and FIG. 2B is a cross-sectional view cut along a direction perpendicular to the central axis. . As shown in the figure, the coaxial cable 3 is composed of an inner conductor 3A, an inner insulator 3B, an outer conductor 3C, and an outer insulator 3D, and the conductors and insulators are alternately arranged concentrically. The inner conductor 3A is made of a conductive metal. The inner conductor 3A has various types such as an annealed copper wire, a tin plated annealed copper wire, a silver plated annealed copper wire, an annealed copper covered steel wire, a tin plated copper covered steel wire, a silver plated copper covered steel wire, and a copper pipe.

  The internal insulator 3B is formed so as to cover the periphery of the internal conductor 3A in order to perform electrical insulation. The internal insulator 3B is made of, for example, Teflon (registered trademark) or polyethylene.

  The outer conductor 3C is formed around the inner insulator 3B. The outer conductor 3C is made of, for example, an annealed copper wire braid, a tin-plated annealed copper wire braid, a silver-plated annealed copper wire braid, an aluminum pipe, or a copper pipe.

  The external insulator 3D is formed so as to cover the periphery of the external conductor 3C in order to perform electrical insulation. The external insulator 3D is made of, for example, vinyl, polyethylene, nylon, silicon rubber or the like.

  3A and 3B are views showing the appearance of the coaxial cable fixing mechanism according to the present embodiment. FIG. 3A is a top view, and FIGS. 3B and 3C are views of the coaxial cable fixing member 1 on the long side and the short side, respectively. It is the side view seen from. FIG. 4 is a cross-sectional view taken along the straight line A shown in FIG. The fixed state of FIGS. 3 and 4 is formed by the following procedure. First, the coaxial cable 3 in which the outer conductor 3C is exposed is inserted into the coaxial cable insertion hole 1B of the coaxial cable fixing member 1, and the outer conductor 3C of the coaxial cable 3 is positioned above the counterbore 1D. Arrange as follows. Next, the outer conductor 3 </ b> C of the coaxial cable 3 is fixed to the counterbore 1 </ b> D by attaching solder 6 from the upper surface side of the coaxial cable fixing member 1. Next, the coaxial cable 3 is arranged so that the position of the inner conductor 3A of the coaxial cable 3 matches the transmission line 7 of the substrate 5 fixed to the casing 4, and the coaxial cable fixing member 1 is fixed to the casing 4 with the fixing screw 2. To do. Finally, the inner conductor 3 </ b> A of the coaxial cable 3 is fixed to the transmission line 7 of the substrate 5 by attaching the solder 8.

  Therefore, according to the coaxial cable fixing mechanism according to the present embodiment, the coaxial cable 3 is fixed to the coaxial cable fixing member 1 by soldering, so that it is not affected by the tightening of the fixing screw 2. That is, it is possible to avoid deformation and damage due to an excessive force applied to the coaxial cable 3 mechanically. Further, the high frequency GND is electrically stable, and an electric signal can be stably supplied to the substrate 5.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment.

  Specifically, the shape of the counterbore 1D is not limited to the above shape. FIG. 5 is a view showing an appearance of a coaxial cable fixing mechanism according to another embodiment of the present invention. Here, the counterbore part 1D is formed so as to penetrate the outer peripheral part of the opening part of the coaxial cable insertion hole 1B. Similarly, the intermediate portion of the coaxial cable insertion hole 1B may be formed by cutting through a single or a plurality of locations. The shape and number of the counterbore portions 1D can be arbitrarily changed in consideration of the direction in which the coaxial cable 3 is fixed, the fixing strength, the efficiency of the soldering operation, and the like.

The figure which shows the external appearance of the coaxial cable fixing member 1 which comprises the coaxial cable fixing mechanism which concerns on one Embodiment of this invention. FIG. 3 is a sectional view showing the structure of the coaxial cable 3. The figure which shows the external appearance of the coaxial cable fixing mechanism which concerns on one Embodiment of this invention. Sectional drawing at the time of cutting along the straight line A shown by Fig.3 (a). The figure which shows the external appearance of the coaxial cable fixing mechanism which concerns on other embodiment of this invention. The figure which shows the external appearance of the conventional coaxial cable fixing mechanism.

Explanation of symbols

1 ... Coaxial cable fixing member,
1A: fixing screw insertion hole,
1B ... Coaxial cable insertion hole,
1C ... slot part,
1D ... Counterbore part,
2 ... Fixing screw,
3 ... Coaxial cable,
3A ... inner conductor,
3B ... Insulator,
3C ... outer conductor,
3D ... External insulator,
4 ... Case,
5 ... substrate,
6 ... solder,
7 ... transmission line,
8 ... Solder.

Claims (5)

A coaxial cable fixing mechanism for fixing a coaxial cable connected to a transmission line on a substrate,
The coaxial cable fixing member is
A coaxial cable insertion hole for inserting the coaxial cable;
Counterbore part formed through the peripheral part of the opening of this coaxial cable insertion hole,
With
The coaxial cable inserted into the coaxial cable insertion hole with the outer conductor exposed is soldered at the counterbore part, and the outer conductor is fixed to the coaxial cable fixing member, and the inner conductor of the coaxial cable is A coaxial cable fixing mechanism connected to a transmission line.   The said counterbore part is formed so that the peripheral location of the opening part of the said coaxial cable penetration hole may be penetrated from the upper surface side of the said coaxial cable fixing member, and an edge part may become concave shape. Coaxial cable fixing mechanism.   3. The coaxial cable fixing mechanism according to claim 1, wherein the counterbore part is formed by penetrating an outer peripheral part of an opening of the coaxial cable insertion hole.   3. The coaxial cable fixing according to claim 1, wherein the counterbore portion is formed by cutting only a peripheral portion on the downstream side in the insertion direction of the coaxial cable in the opening portion of the coaxial cable insertion hole. mechanism. A substrate having a transmission line connected to the inner conductor of the coaxial cable;
A housing to which the substrate is fixed;
A coaxial cable fixing member fixed on the housing and fixing the coaxial cable to the substrate;
A coaxial cable fixing mechanism comprising:
The coaxial cable fixing member is
A coaxial cable insertion hole for inserting the coaxial cable;
A counterbore part having an end formed in a concave shape, penetrating at least the board side opening of the coaxial cable insertion hole from the upper surface side of the coaxial cable fixing member,
With
The coaxial cable inserted through the coaxial cable insertion hole is in a state where the outer conductor is exposed at the position of the counterbore and the inner conductor is exposed at the position of the transmission line, and the outer conductor and the coaxial cable are exposed at the counterbore. A coaxial cable fixing mechanism, wherein a fixing member is soldered and the inner conductor is soldered to the transmission line on the substrate.

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