JPH04249077A - Structure of center conductor connection part in high-frequency electronic apparatus - Google Patents

Abstract

PURPOSE:To narrow gap between two center conductor fastening tools, thereby designing the case in small size, and suppress the cost by installing a shield plate, which shuts off electromagnetic interference of a high frequency signal, inside of an insulative bulkhead partitioning the two fastening tools from each other. CONSTITUTION:A shield plate 34 to shut off electromagnetic interference of a high frequency signal between two center conductor fastening tools 27 is installed inside of an insulative bulkhead 32 located on a holder 21 for insulative material, wherein the bulkhead partitions the two fastening tools 27 from each other. In case center conductors 47 are attached to the respective fastening tools 27, the tips of the conductors 47 are shut off by the bulkhead 32 even though the distance between the fastening tools is small and the center conductors are long, and thus shortcircuiting is prevented, Also in the condition signals are transmitted, electromagnetic interference of two high frequency signals can be shut of by the shield plate 34, This allows simplifying the constitution, constructing the case in small size, and suppressing the cost.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a center conductor connection in a high frequency electronic device in which two center conductor stops are provided on one side of a case.

0002

[Prior Art] The structure of the center conductor connection part in this type of high-frequency electronic equipment is such that an insulating holder is attached to one side of the case, and two center conductor fasteners for fixing the center conductor are attached thereto. be. In order to reduce the size of the case, the two center conductor stops are arranged close to each other (see, for example, Japanese Patent Laid-Open No. 170014/1983).

0003

[Problems to be Solved by the Invention] In the structure of the center conductor connection portion in this conventional high-frequency electronic equipment, when the center conductor is fixed to each center conductor stopper, if the center conductor is long, the center conductor is fixed to both stops respectively. There is a problem in that there is a risk that the tips of the attached center conductors may come into contact with each other and cause a short circuit. Furthermore, even if these center conductors are short, when transmitting high-frequency signals in the gigahertz band with each center conductor fixed to each stopper, the signals may cause electromagnetic interference between the conductors. There is a problem that causes In order to solve these problems, it is necessary to move the two center conductor stops away from each other, but this causes the problem of increasing the size of the case.

The present invention was made in order to solve the problems (technical problems) of the prior art described above, and simply forms a partition wall in the holder between two center conductor stops and incorporates a shield plate therein. With this extremely simple configuration, it is possible to prevent short circuits between the center conductors and electromagnetic interference between the two fasteners, while keeping the case compact. The purpose is to provide a structure for conductor connections.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the structure of the center conductor connection portion in the high frequency electronic device according to the present invention is such that the center conductor is connected to an insulating holder provided on one side of the case of the high frequency electronic device. In the structure of a center conductor connection part in a high-frequency electronic device that is provided with two center conductor stops for fixing, a partition wall formed of the same insulating material as the above-mentioned insulating holder is provided between the two center conductor stops. In addition, a shield plate is built into the partition wall to block electromagnetic interference of high frequency signals between the two center conductor stops.

[0006]

[Operation] When the center conductors are fastened to the two center conductor fasteners, even if the center conductors are long, the partition wall blocks the ends of the center conductors from each other and prevents a short circuit between the two. Further, the shield plate blocks mutual electromagnetic interference between high frequency signals transmitted at both center conductor stops.

[0007]

Embodiments The drawings showing embodiments of the present application will be described below. In FIGS. 1 and 2, reference numeral 1 indicates a series unit for communal television reception as an example of high-frequency electronic equipment. Reference numeral 2 denotes a case, which is formed by bending a metal plate with good conductivity, and constitutes a ground circuit for the series unit. This case 2 is composed of a front plate 3, left and right side plates 4 and 5 bent rearward from the left and right edges of the front plate 3, and a well-known cover for closing the open rear part. Reference numeral 6 denotes mounting pieces attached to the top and bottom of the case 2, which are integrated with the front plate 3, and have mounting holes 7 for mounting to the switch box.
, a mounting hole 8 for mounting to a wall surface, a screw hole 9 for mounting a flush plate, etc. are drilled. Next 11
is an outlet terminal attached to the front plate 3 for connection to the antenna terminal of a television receiver; in this example, a coaxial socket is used. This may be a connection terminal of a parallel feeder. 12 is an input terminal provided on the right side plate 5, which is one surface of the case; 13 is an output terminal provided on the left side plate 4, which is the other surface of the case; and 14 is a branch terminal.

Next, the output terminal 13 and branch terminal 14 will be explained with reference to FIGS. 3 and 4. In addition, input terminal 1
2 has the same structure as the branch terminal 14, so a redundant explanation regarding it will be omitted. 16 is an external conductor connector, 1
7 shows center conductor connectors, respectively. Reference numerals 13a and 14a indicate connection axes of the respective terminals 13 and 14, that is, directions in which the central axes of the transmission lines are oriented when the transmission lines are respectively connected to each terminal. These connection axes are the outer conductor connectors 16 at each terminal.
It is determined by the positional relationship between the center conductor connector 17 and the center conductor connector 17.
Connect each terminal 13, so that 3a and 14a intersect in a V shape.
Each connector 16, 17 in 14 is arranged. The external conductor connector 16 is of a known structure and is 18
1 is a tightening piece, and 19 is a tightening screw, which is screwed into the side plate 4 through the tightening piece 18. Next, output terminal 13 and branch terminal 1
The center conductor connector 17 of No. 4 will be explained. An insulating holder 21 is made of an insulating material, for example, a synthetic resin material, and is fixed to the side plate 4. The fixing structure is such that a mounting hole 22 is formed in the side plate 4, and the holder 21 is fitted into the mounting hole 22 so that the hole edge 22a fits into a fitting part 23 formed at the edge of the holder 21. 24 is the holder 21
25 is a notch formed in the upright wall 24 for introducing the center conductor, and 26 is a notch for leading out. It's for tightening. Reference numerals 27 and 27 indicate center conductor stops attached to the holder 21, respectively, and are provided inside surrounded by the rising wall 24. To explain this center conductor stopper 27, 28 is a receiving plate attached to the holder 21, and is made of a metal material with good conductivity. 29 is a presser plate,
It is made of the same material as the receiving plate 28. Reference numeral 30 denotes a tightening screw which is screwed into a screw hole in the receiving plate 28 through the holding plate 29.

Next, 32 is an output terminal 13 and a branch terminal 14.
This is a partition wall provided between the respective center conductor stops 27, 27 in order to prevent the center conductors fastened to each stop 27 from coming into contact with each other. The height H1 shown in FIG. 4A is higher than the holding plate 29 when the tightening screw 30 of the center conductor stopper 27 is loosened and the holding plate 29 is moved farthest from the receiving plate 28. It is formed at such a height. In this example, the height is approximately the same as the height of the rising wall 24. This partition wall 32 is integrally formed with the holder 21 and is hollow. A shield plate 34 is made of a metal material with good conductivity and is built into the partition wall 32. In this example, the partition wall 32
The holder 21 is fitted into the hollow part 33 of the holder 21 in a later process.
It may be inserted into the partition wall 32 during molding. The height H2 and width W2 of this shield plate 34 are:
By preventing electromagnetic interference of high-frequency signals between the stops 27 and 27, the characteristic of reverse coupling loss between the output terminal 13 and the branch terminal 14, which will be described later, is maximized over the entire operating frequency band of this series unit. It is experimentally determined to be good. Reference numeral 35 designates a connecting piece on the shield plate 34, which is electrically connected to the side plate 4 with solder 36. Connections may be made by welding.

Next, a description will be given of FIG. 5 showing the electric circuit members housed in the case of the series unit. 38 is a branch circuit, 38a is its input end, 38b is its output end, 38
c indicates a branch end. 39 is a distribution circuit, 39a is its input end, and 39b and 39c are distribution ends, respectively.

Next, a method of using the series unit 1 having the above configuration will be explained. As shown in FIG. 1, input-side transmission lines 43 are led through various lead-in holes (one is indicated by reference numeral 42) into a switch box 41 attached to a base member for installation, such as a pillar 40; Each terminal of the output transmission line 44 and branch transmission line 45 (coaxial cables are used as these transmission lines) is stripped in stages as is well known. Next, those terminals are connected to each terminal 12, 13, and 14. That is, as shown in FIG. 4(A), while inserting the exposed portion of the outer conductor 46 under the tightening piece 18,
Pass the center conductor 47 through the cutout 25 and connect it to the receiving plate 28 and the holding plate 2.
Insert between 9 and 9. Then, the tightening screws 19 and 30 are tightened to fix each part. When connecting transmission lines as described above, in the output terminal 13 and branch terminal 14, even if the center conductor 47 of each transmission line 44, 45 is too long and protrudes from the cutout 26, its tip will Abutting the bulkhead 32 and curving laterally along its surface, both transmission lines 44
, 45 are prevented from coming into contact with each other. Next, after connecting each transmission line as described above, place them in the switch box 41 as shown in FIG. After that, the serial unit 1 is fixed to the switch box 41 by screwing it into the screw hole 49 of the switch box 41. Thereafter, as is well known, a flash plate is attached using the screw holes 9, thereby completing the installation work of the series unit.

In the above installation state, the transmission line 43
The television signal sent through the branch circuit 38 is output from the output terminal 13, and is sent to the next stage through the transmission line 44 on the output side. Further, a part of the television signal reaches the distribution circuit 39 from the distribution end 38c of the branch circuit 38. Half of the signal is outputted through the outlet terminal 11 to the television receiver connected thereto. The remaining half is output from the branch terminal 14 and reaches the television receiver in another room through the branch transmission line 45.

Next, FIG. 6 shows the characteristics of reverse coupling loss between the output terminal 13 and the branch terminal 14 in the series unit 1. In this figure, the solid line shows the characteristics of the series unit of the above embodiment, and the broken line shows the characteristics of a unit similar to the above embodiment but with the shield plate 34 removed. As is clear from this characteristic diagram, in the case where the shield plate 34 is provided, VHF, UHF, BS-IF, C
In the entire band of each S-IF television signal, especially in the highest frequency band of CS-IF, higher reverse coupling loss can be obtained than when no shield plate is used.

[0014]

As described above, in the present invention, each of the two center conductor stops 27, 27 has a center conductor 47,
47, even if the distance between the fasteners is close and the center conductor is long, the center conductor 47,
The ends of the central conductors 47 can be shielded from each other by the partition wall 32 made of an insulating material, which has the effect of preventing short circuits between the ends of the central conductors 47, 47.

Furthermore, when the center conductor is fastened to each center conductor stopper 27, 27 and signals are transmitted, even if the signal transmitted through each conductor is a high frequency signal in the gigahertz band, for example, both high frequency signals are transmitted. Since electromagnetic interference can be blocked by the shield plate 34 within the partition wall 32, the center conductor stoppers 27, 27 can be placed mechanically close to each other. This has a great effect in reducing the size of the case in which both of the fasteners are provided.

Moreover, even if the center conductor stops are close to each other as described above, it is possible to prevent short circuits due to mechanical contact between the center conductors fastened to each other, and it is also possible to prevent interference of high frequency signals between the upper stops. Even if this configuration is adopted, the configuration is extremely simple in that the shield plate 34 is just built into the partition wall 32 formed in the insulating holder 21, so it has the effect that it can be implemented at extremely low cost.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing how transmission lines are connected to various terminals.

[Figure 2] (A) is a front view of the series unit installed in the switch box, (B) is B in (A)
Enlarged view of the part.

3 is a vertical sectional view showing only the switch box in the state shown in FIG. 2(A); FIG.

[Fig. 4] (A) is a cross-sectional view taken along the line IV-IV in Fig. 3;
(B) is a sectional view taken along the line IV'-IV'.

FIG. 5 is a circuit diagram.

FIG. 6 is a graph showing reverse coupling loss characteristics.

[Explanation of symbols]

2 Case 13 Output terminal 14 Branch terminal 21 Holder 27 Center conductor stopper 32 Partition wall 34 Shield plate

Claims (1)

[Claims] Claim 1. A structure of a center conductor connection part in a high frequency electronic device, in which two center conductor fasteners for fixing the center conductor are attached to an insulating holder provided on one side of a case of the high frequency electronic device, A partition made of the same insulating material as the insulating holder is provided between the two center conductor stops, and a partition wall is provided within the partition to block electromagnetic interference of high frequency signals between the two center conductor stops. A structure of a center conductor connection part in high-frequency electronic equipment characterized by having a built-in shield plate for protection.