JPH06208857A - Distributor - Google Patents

Abstract

PURPOSE:To reduce the generation of a bad influence of the signal, which is sent by a coaxial cable, to an external equipment and the generation of a bad influence of the external turbulence to the signal. CONSTITUTION:A transformer 19 and a choke coil 20 are fitted to a printed board 11. An insulating holding member 12 is fixed to the top surface of the printed board 11. A connecting terminal 13 is fitted to the insulating holding member 12. A transparent plastic plate 14 is placed on the insulating holding member 12. The upper end of the plastic plate 14 is covered with a metal plate 15. The metal plate 15 is provided with a pinching member 16 for pinching an external conductor winding of a coaxial cable. The metal plate 15 is provided with a slit 30 so that the connecting condition of the connecting terminal and a center conductor of the coaxial cable is seen form the top surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distributor and a branching device,
In particular, the present invention relates to a distributor and a brancher provided in a television co-listening device or the like and connected with a coaxial cable.

[0002]

2. Description of the Related Art FIGS. 12 and 13 show structures of a conventional distributor provided in a household television co-listening device, which are usually housed in a plastic case.

In the distributor shown in FIG. 12, an insulating plate 2 is mounted on a printed circuit board 1 on which electric circuit parts are mounted, and a central conductor connection for connecting the central conductor of a coaxial cable to the insulating plate 2. On the other hand, the grounding plate 4 covering the printed circuit board 1 is provided with a hole 5 through which the central conductor connecting portion 3 passes, and a sandwiching member 6 for sandwiching and connecting the outer conductor braid of the coaxial cable is integrally formed. It is provided and configured.

In the distributor shown in FIG. 13, a frame-shaped earth plate 7 is arranged on the printed board 1, and a braid connecting portion 8 for connecting the outer conductor braid of the coaxial cable is arranged on the earth plate 7. The center conductor connecting portion 3 of the coaxial cable is arranged inside the frame-shaped earth plate 7 while being provided.

[0005]

By the way, in recent years, home-use AV equipment has become widespread, and the number of equipment for receiving satellite broadcasting has increased, and the influence of television signal leakage and disturbance on television signals has become a problem. ing.

Further, in recent years, the frequency band transmitted by satellite broadcasting or the like has spread, and a structure for improving the characteristic impedance over a wide frequency band is required.

However, in all of the conventional distributors, since the central conductor connecting portion 3 of the coaxial cable is exposed to the outside, the structure of the coaxial cable becomes an open shape, the coaxial mode collapses, and impedance mismatching occurs. And the problem of radiation to the outer conductor braid of the coaxial cable may occur.

The present invention has been made in consideration of such a point, and the structure of the connecting portion of the coaxial cable can be almost completely kept in the coaxial shape, and the influence of the signal on the external equipment and the signal can be improved. It is an object of the present invention to provide a distributor capable of significantly reducing the influence of the external disturbance.

[0009]

As a means for achieving the above object, the present invention provides a printed board on which a connection terminal to which a center conductor of a coaxial cable is connected and an electric circuit component are mounted; and above the printed board. And a sandwiching member which is integrally provided with the metal plate and which sandwiches and connects the outer conductor braid of the coaxial cable.

Further, in the present invention, it is preferable that an opening for confirming the connection between the connection terminal and the central conductor from the upper surface side of the metal plate is provided at a portion of the metal plate corresponding to the connection terminal.

It is more preferable that the printed circuit board, the metal plate, and the sandwiching member are housed in a plastic case having a lid at a substantially central position.

[0012]

In the distributor according to the present invention, the central conductor connecting portion of the coaxial cable is covered with the printed board and the metal plate. For this reason, the connection portion can be almost completely kept in the coaxial shape, and the influence of the signal on the external device and the influence of the signal disturbance can be significantly reduced.

In the present invention, by providing an opening in the metal plate, the connection state between the connection terminal and the central conductor can be easily confirmed through the opening, and the connection work is facilitated and the connection error is eliminated. .

Further, by accommodating the printed circuit board, the metal plate and the sandwiching member in the concave portion at the substantially central position in the plastic case, it becomes possible to handle the same as a conventional distributor.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows one side of a distributor according to the present invention. The distributor includes a printed board 11, a connection terminal 13 attached to the printed board 11 via an insulating holding member 12, and an insulating holding member. A metal plate 15 disposed on the upper surface side of 12 via a transparent plastic plate 14. A sandwiching member 16 having a generally U-groove shape for sandwiching and connecting the outer conductor braid of the coaxial cable to the metal plate 15.
Are provided integrally. And this distributor is shown in FIG.
As shown in FIG. 5, the housing is fixed in a plastic case 17 having an opening lid 18.

A transformer 19 for branching or distributing a television signal is provided on the printed circuit board as shown in FIG.
In addition to the above parts, an energizing circuit for sending power from the tuner through the distributor to operate the satellite broadcast converter is installed, and electrical parts such as the choke coil 20 for passing the power and blocking high frequency signals are installed. Has been. The insulation holding member 12 is mounted and fixed on the upper surface side of the printed circuit board 11 while avoiding the mounting parts.

As shown in FIGS. 1, 3 and 4, this insulation holding member 12 is constructed by connecting, for example, three groove-shaped connecting terminal mounting portions 12a with gate-shaped mounting legs 12b. Has been done. As shown in FIG. 4, a positioning boss 21 for connecting to the printed circuit board 11 and a connection terminal insertion hole 22 are provided at the bottom of the groove of each connection terminal mounting portion 12a, and at the lower end of the mounting leg 12b. Is provided with a snap locking claw 23 that is locked to the printed board 11.

As shown in FIGS. 5 to 7, the connection terminal 13 is provided with a rectangular frame-shaped frame body 24.
The end face 24a of the coaxial cable on the insertion side of the central conductor is obliquely cut to facilitate the insertion of the central conductor.

On the rear side of the frame body 24, that is, on the opposite side of the insertion-side end face 24a, a pair of elastic pieces 25 which are continuous with the side surface and extend along the inserting direction of the center conductor of the coaxial cable are extended. A contact portion 26 is connected to the rear end portion of 25.

As a result, when the center conductor of the coaxial cable is inserted into the connection terminal 13, the center conductor is guided to the contact portion 26 by being guided by the elastic pieces 25 on the left and right sides of the center conductor. It is designed so that the wrong insertion can be prevented.

Here, the elastic piece 25 extends rearward so that its interval gradually narrows and continues to the contact portion 26, that is, the elastic piece 25 extends rearward at a gentle angle without forming a steep angle, whereby the center conductor is formed. It is formed so that it can be easily inserted and the tip of the contact portion 26 can be expanded outward to obtain a sufficient holding force.

Further, a gap is formed on the inner peripheral surface of the contact portion 26 by the arcuate recess 26a, and this gap is set to be smaller than the wire diameter of the center conductor of the coaxial cable used.

On the lower surface of the frame body 24, leg portions 27 extending vertically downward are provided vertically. The lower ends of the leg portions 27 are soldered portions 27 for connecting to the electric circuit of the printed circuit board 11.
It is said to be a. In addition, as shown in FIG. 5, a claw 28 is provided in the middle of the leg portion 27 so as to prevent the leg portion 27 from coming off when it is inserted into the connection terminal insertion hole 22.

Further, on the upper surface of the frame body 24, the contact portion 2
The upper gap formed by 6 is closed to prevent the inner conductor from coming out of the upper gap, and to prevent the inner conductor from coming out.
A guide piece 29 for guiding to 6 is continuously provided.

On the other hand, as shown in FIGS. 1 and 3, the metal plate 15 has a top surface portion 15a which covers the upper surface of the printed circuit board 11.
And a hanging part 15 hanging from both ends of the top surface part 15a.
b and the leg portion 1 that bends outward from the lower end of each hanging portion 15b
And 5c. Each of the sandwiching members 16 is integrally provided at the outer end of the leg portion 15c, and each of the sandwiching members 16 is provided with a plurality of protrusions 16a for preventing the coaxial cable from being pulled out in the axial direction.

As shown in FIG. 1, a slit 30 into which the center conductor of the coaxial cable is inserted is provided at the portion corresponding to the connection terminal 13 of the top surface portion 15a and the hanging portion 15b, and the leg portion 15c. As shown in FIG. 3, a foot 31 for ground soldering to the printed circuit board 11 is provided at the inner end, and the foot 31 is formed by bending a part of the portion where the slit 30 is removed downward. Has been done.

The plastic case 17 is shown in FIG.
As shown in FIGS. 8 and 9, the structure is such that the shallow container is turned upside down, and the printed board 1
1 and the concave portion 32 in which the main parts such as the metal plate 15 are accommodated
Is provided, and a U groove 33 is provided in a portion corresponding to each sandwiching member 16. The flat upper surface of the plastic case 17 other than the recess 32 and the U groove 33 serves as a notation such as "input", "output", and "energization".

As shown in FIGS. 8 and 9, a plurality of locking claws 34 for snap-locking the legs 15c of the metal plate 15 to hold the metal plate 15 are provided on the peripheral wall of the recess 32. Has been.

Further, as shown in FIG. 8, a lock hole 35 into which a lock claw 36 of an opening / closing lid 18 described later is inserted and locked is provided in the peripheral portion of the plastic case 17.

On the other hand, as shown in FIGS. 2 and 8, the opening / closing lid 18 connected to the plastic case 17 by a hinge structure has a shallow lid shape, and a portion corresponding to the U-groove 33 is formed. A semicircular cutout 37 is provided, and a lock claw 36 is provided at a portion corresponding to the lock hole 35. Then, the lock claw 36 and the lock hole 3
The lock with 5 is released by pressing the opening / closing projection 38 inward.

Next, the operation of this embodiment will be described.
To assemble the distributor, first, the insulation holding member 12 and the connection terminal 1
The printed circuit board 11 to which 3 is attached is arranged at a substantially central position in the plastic case 17, and the plastic plate 14
Put it on it. Subsequently, when the metal plate 15 is inserted into the plastic case 17 from above and pressed, the metal plate 15 is pressed.
The locking claw 34 is rocked and displaced by the leg portion 15c, and further, the leg portion 15c is fixed by coming to a position below the locking claw 34.

As described above, according to this embodiment, the distributor can be easily assembled in the plastic case 17 without using screws or the like.

When connecting the coaxial cable, as shown in FIG. 10, the center conductor 41 of the coaxial cable 40 is connected to the connection terminal 13 through the slit 30, and the outer conductor braid 42 is arranged in the sandwiching member 16. Then, both side walls of the sandwiching member 16 are narrowed inward. As a result, the coaxial cable 40 is firmly fixed to the distributor.

In this case, the central conductor 4 of the coaxial cable 40
1 is connected to the connection terminal 13 by the plastic plate 14
Also, since it can be confirmed from the upper surface side of the metal plate 15 through the slit 30, the connection work is easy and there is no connection error.

The printed circuit board 11 and the connection terminal 1 are also provided.
Since the upper surface side of 3 is almost completely covered by the metal plate 15, the connecting portion of the coaxial cable 40 can be maintained in a substantially completely coaxial shape, and impedance engagement can be easily taken over a wide frequency band. The coaxial mode can be maintained. Therefore, unnecessary radiation from the outer sheath of the coaxial cable due to mismatch of mode conversion can be reduced.

Further, the choke coil 20 is apt to generate traps in the television signal frequency band due to the influence of an external metal plate or the like, so that a space which does not have the influence is required.
By covering with the metal plate 15 as the ground plate, influences from others can be reduced.

FIG. 11 is a partial perspective view showing another embodiment of the sandwiching member 160 provided on the metal plate 15. In this embodiment, the upper end edges 162 of the pair of sandwiching pieces 161 of the sandwiching member 160 are respectively bent outward, and the upper end edges 162 are substantially centered at the bent portions.
By forming a mountain-shaped cut line, triangular protrusions 163 are formed in opposite directions.

The sandwiching piece 161 is bent in a substantially U-shape, and a pair of openings 164 are provided near the upper end position of the well so as to be arranged in the axial direction of the sandwiching member 160. Also, the leg portion 165 inserted into the mounting hole in the plastic case 17 has the sandwiching piece 1
One opening 166 is formed near the connecting portion with 61.

By the sandwiching member 160 having the above structure, the following actions and effects can be obtained. First, the outer conductor braid 42 of the coaxial cable 40 is placed in the sandwiching member 160, and the pair of upper end edges 162 are tightened so as to approach each other by using a sandwiching tool such as pliers, whereby the pair of sandwiching pieces 161 bends. The outer conductor braid 42 is sandwiched. At this time, the protrusion 163 is inserted into the outer conductor braid 42, and the coaxial cable 4
The axial stop of 0 is prevented.

Further, each sandwiching piece 161 has a small cross-sectional area. Bending deformation occurs at the line connecting the two openings 164, resulting in a substantially circular curved shape. As a result, the sandwiching pieces 161 are respectively attached to the coaxial cables 40.
The outer circumference of the outer conductor braid 42 is in close contact with the circular cross-sectional shape without breaking. Therefore, even after this pinching operation, the high frequency impedance of the coaxial cable 40 is kept good, and the axial strength of the coaxial cable 40 is not reduced. Also coaxial cable 4
Even when the force of pulling 0 upward is applied, the upper side of the coaxial cable 40 is sandwiched, so that it cannot be easily detached from the sandwiching member 160. If the two openings 164 are not provided, the sandwiching piece 161 is easily bent from the vicinity of the bottom of the U-shape, does not become a circular curved shape after bending, and deforms the cross section of the coaxial cable into an elliptical shape. There was an occasion.

The leg portion 165 is a plastic case 1.
After being inserted into the mounting hole of No. 7, it is twisted and deformed. At this time, the portion provided with the opening 166 is easily twisted and deformed. In addition, in order to facilitate the torsional deformation of the legs, a structure is known in which a notch is formed in the portion that is torsionally deformed (see, for example, FIGS. 1 and 3), but this structure is broken at the notch. It has the drawback of being easy. In the above-described embodiment, the openings 164 and 166 are shown to have a circular shape, but the openings 164 and 166 may have other shapes such as an ellipse.

[0042]

As described above, according to the present invention, the structure of the connecting portion of the coaxial cable can be maintained almost completely in the coaxial shape, and the influence of the signal on the external equipment and the influence of the disturbance of the signal can be maintained. Can be significantly reduced.

In the present invention, by providing an opening in the metal plate, the connection state between the connection terminal and the center conductor can be confirmed through this opening, and the connection work is facilitated and there is no connection error.

Further, by accommodating the printed circuit board, the metal plate and the sandwiching member at the substantially central position in the plastic case, it can be handled in the same manner as a conventional distributor.

Further, with the configuration of the present invention, the circuit portion can be positioned substantially in the center of the case in the thickness direction, and the position of the coaxial cable also coincides with the center of the case in the thickness direction. Compared with, the whole case can have a thin structure and a large space can be secured in the circuit portion.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a distributor according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state where the distributor is housed in a plastic case.

FIG. 3 is an exploded perspective view showing details of a metal plate and an insulation holding member.

FIG. 4 is a configuration diagram of the insulation holding member of FIG. 3 viewed from a lower surface side.

FIG. 5 is a perspective view showing details of connection terminals.

6 is a side view of FIG.

7 is a configuration diagram of the frame body of the connection terminal viewed from the left side of FIG.

FIG. 8 is a configuration diagram showing one end of FIG. 2 in a cutaway manner.

FIG. 9 is a cross-sectional view of an essential part showing the configuration of a locking claw portion of a recess.

FIG. 10 is an explanatory diagram showing a method of connecting coaxial cables.

FIG. 11 is a partial perspective view showing another embodiment of the sandwiching member.

FIG. 12 is a perspective view showing an example of a conventional distributor.

FIG. 13 is a perspective view showing another example of a conventional distributor.

[Explanation of symbols]

 11 printed circuit board 12 insulation holding member 13 connection terminal 14 plastic plate 15 metal plate 16 sandwiching member 17 plastic case 18 opening / closing lid 30 slit

Claims (3)

[Claims] 1. A printed circuit board on which a connection terminal to which a center conductor of a coaxial cable is connected and an electric circuit component are mounted;
A distributor comprising: a metal plate that covers the printed circuit board; and a sandwiching member that is integrally provided with the metal plate and that sandwiches and connects the outer conductor braid of the coaxial cable. 2. The metal plate has an opening at a portion corresponding to the connection terminal for confirming a connection state between the connection terminal and the central conductor from an upper surface side of the metal plate. 1. The distributor according to 1. 3. The distributor according to claim 1 or 2, wherein the printed circuit board, the metal plate and the sandwiching member are housed in a recess at a substantially central position in a plastic case having a lid.