JPH0216552Y2 - - Google Patents

Description

[Detailed description of the invention] The invention of the present application aims to solve the following problems.

(Field of Industrial Application) This invention relates to communal receiving equipment such as amplifiers, branch distributors, protectors, etc. that are installed and used outdoors, and specifically relates to the structure of lightning protection sections in such communal receiving equipment.

(Prior Art) In the conventional lightning protection section of this type of community receiving equipment, a lightning arrester element having lead wires at one end and the other end is attached to a circuit board provided in a case for the community receiving equipment. , the structure in which the lead wire is connected to the connecting terminal for the center conductor and the ground circuit, respectively, with the circuit conductor provided on the circuit board, the circuit from the connecting terminal to the ground circuit through the lightning arrester is connected. As the length increases, an inductance component is generated that delays the passage of lightning current, so when lightning surges enter the connection terminal, the lightning protection effect becomes insufficient. In addition, the above configuration is
If you wish to inspect the lightning arrester, you must remove the circuit board from the case and remove the lightning arrester with the lead wires from the circuit board, and reassemble it in the reverse order. There was a problem that made the work extremely troublesome.

(Problems to be solved by the invention) This invention, except for the above-mentioned conventional problems, can achieve an extremely effective lightning protection effect when a lightning surge enters the connection terminal, and also allows for simple and quick inspection of lightning protection elements. The purpose of the present invention is to provide a lightning protection section for joint receiving equipment that can be used in a variety of situations.

The configuration of the present invention is as follows.

(Means for Solving the Problems) The present invention takes the measures as described in the claims above, and its effects are as follows.

(Function) When inspecting a lightning arrester element, the lightning arrester element can be removed from the circuit board by simply holding the knob and pulling it out. When returning the lightning arrester to its original position, the lightning arrester is attached to the circuit board by holding the knob and inserting it into a predetermined position. In the installed state, the electrodes provided on one side and the other side of the lightning arrester are in surface contact with the side surface of the connection terminal and the surface of the ground conductor facing the connection terminal, respectively. In this state, no inductance component is generated between the connection terminal and the lightning arrester and between the lightning arrester and the ground conductor. Therefore, lightning surges that have entered the connection terminal can quickly pass through the lightning arrester and fall onto the ground conductor.

(Example) Below, drawings showing examples of the present application will be described. Reference numeral 1 designates a case for a community receiving device, which is composed of a main body 2 and a lid 3, each made of a metal material and connected to each other so as to be openable and closable. Reference numeral 4 denotes a circuit board provided in the case, which is fixed to the fixing seat 5 with a fixing post 6 made of a conductive material. This circuit board 4 is provided with a grounding circuit conductor 7 and a connecting circuit conductor 8,
An electronic circuit is constructed by connecting a large number of circuit elements 9 thereto. 10 indicates a space for storing electronic elements. Reference numeral 11 indicates a display panel made of a conductive material, reference numeral 12 indicates a fixing screw, and reference numeral 13 indicates a through hole formed in the panel 11. Next, reference numeral 15 indicates a connection part (input terminal or output terminal) with a lightning protection part attached to the circuit board 4.
In this case, a holder 16 is made of an insulating material and is formed in a concave shape. Reference numeral 17 indicates a positioning projection provided on the holder 16, which is fitted into a through hole 17a formed in the circuit board. 18 is holder 1
The introduction hole of the center conductor formed in 6 is shown. Reference numeral 19 denotes a connection terminal provided in the holder 16, which is made of a conductive material, and is fixed to the circuit board 4 by fixing screws 20 made of a conductive material. This fixing screw 20 also makes an electrical connection between the connecting terminal 19 and the connecting circuit conductor 8. Reference numeral 21 indicates an insertion hole for the center conductor, and reference numeral 22 indicates a fixing screw screwed into the connecting terminal 19 so as to be freely tightened and loosened. Reference numeral 23 indicates a contact surface with a lightning arrester element configured with a side surface of the connection terminal 19. Next, reference numeral 24 denotes a ground conductor, which is made of a conductive material having elasticity, such as a phosphor bronze plate, and is disposed opposite to the connection terminal 19 across the intervening space A of the lightning arrester element. In this ground conductor 24, 25 is a base portion along the inner wall surface of the holder 16, and 26 is a connecting portion that is mechanically connected to the ground circuit conductor 7.
It is electrically connected. 27 is a contact part, base part 2
5, and has an urging force in the direction away from the base portion 25. 28 is the contact part 27
The contact surface with the lightning arrester element is shown in the figure. Next, 30 is a knob, which is made of an insulating material. In this figure, reference numeral 31 indicates a knob at the base, 32 indicates a holding section for the lightning arrester formed at the tip, and 33 indicates a slit. Note that the holding portion 32 is a lightning arrester element 34 described below.
The structure is such that it can be held elastically and firmly by the presence of the slit 33. Next, in the lightning arrester element 34, reference numeral 35 denotes an insulating tube, and 36 and 37 denote electrodes provided at both ends thereof, which are exposed on one side and the other side of the knob 30, respectively, and on the contact surfaces 23 and 28, respectively. There is face-to-face contact. Next, 38 is a connector seat for connecting a transmission line, which is attached to the main body 2. In this figure, reference numeral 39 indicates an outer conductor, and a fixing screw portion 40 formed as a part of the outer conductor is screwed into the main body 2. Reference numeral 41 denotes a center conductor, which is inserted into the insertion hole 21 through the introduction hole 18 and is fixed to the connection terminal 19 with a locking screw 22.
The relationship between the knob 30 and the lightning arrester element 34 is such that the base of the knob 30 is made of a conductive material (metal), while the tip for holding the lightning arrester is made of an insulating material. The entire handle bar 30 may be made of a conductive material and an insulating ring may be provided on the inner peripheral surface of the holding part 32, or the entire handle bar 30 may be made of a conductive material and a lightning arrester element 34 may be provided on the inner peripheral surface of the holding part 32.
The structure may be such that the outer periphery of the lightning arrester element 34 is held by the knob 30 while the electrodes 36 and 37 of the lightning arrester element 34 are not electrically connected by holding only the insulating cylinder 35 portion.

In the case of the above configuration, when the transmission line is connected to the connector seat 38, the transmission line is connected to the connector seat 38.
The television signal entering the center conductor 41 of the circuit board 4 passes through the fixing screw 20 and reaches the connecting circuit conductor 8.
Amplification and other well-known electrical processing is performed by electronic circuitry provided in the .

Also, from the transmission line to the center conductor 41 of the connector seat 38
When a lightning surge enters the area, a small lightning arrester element 3
4 is embedded between the connecting terminal 19 and the ground conductor 24, the lightning surge directly reaches the electrode 36 of the lightning arrester element from the center conductor 41 through the connecting terminal 19, and further reaches the electrode 36 of the lightning arrester element. It has a well-known lightning protection function and reaches the electrode 37, and then directly from the electrode 37 to the contact portion 27 of the earth conductor 24, and is dropped to the earth conductor 7 via the base portion 25 and the connection portion 26.

When inspecting the lightning arrester element 34, open the lid 3 and grasp the knob 31 of the knob 30 and pull the knob to the left in FIG. Then, the lightning protection element 34 attached to the tip of the knob 30 is pulled out from between the connection terminal 19 and the ground conductor 24.
Then, the lightning arrester element 34 attached to the tip of the knob 30 may be visually inspected. When the lightning arrester element 34 is removed, the lightning arrester element 34, the connecting terminal 19, and the ground conductor 24 are not directly touched, so that there is no adverse effect on the transmitted television signal as described above. If you wish to remove the lightning arrester 34 from the knob 30 and inspect it, insert a flat tool such as the tip of a flathead screwdriver into the slit 33 and pry the tool to slightly expand the diameter of the holding portion 32. . In that state, the lightning arrester element 34 is attached to the holding part 32.
You can remove it from. Next, connect the lightning arrester to terminal 1
9 and the ground conductor 24, remove the knob 30 with the lightning arrester 34 attached.
Contrary to the above, push the knob 30 toward the right in FIG. 1 so that the tip end enters the intervention space A. As a result, the lightning arrester element 34 is embedded in a predetermined position between the connection terminal 19 and the ground conductor 24, and the electrodes 36 and 37 are brought into surface contact with the contact surfaces 23 and 28, respectively. In this case, insertion can be easily performed by being guided by the guide portions 16a, 16a on the side wall of the holder 16, the connecting terminal 19, and the ground conductor 24. Thereafter, all inspection work is completed by closing the lid 3 to the main body 2.

(Effects of the invention) As described above, in the present invention, the small lightning arrester element 34 is placed between the connection terminal 19 and the ground conductor 24, so that one surface of the element 34 is directly on the side surface of the connection terminal 19. The connecting terminal 19 is in surface contact with the earth conductor 24, and the other surface is also in direct surface contact with the ground conductor 24.
Since a small lightning arrester element is buried between the connection terminal 19 and the earth conductor 24 so that the path from the lightning arrester element 34 to the ground conductor 24 is the shortest straight line, there is an inductance component that delays the passage of lightning current. There is a feature that does not occur there. This means that when a lightning surge enters the connection terminal from the transmission line, it can quickly pass through the lightning arrester and be grounded, which is very useful in providing an extremely effective lightning protection effect.

Moreover, as mentioned above, in order to improve lightning protection characteristics, a small lightning protection element 34 is connected to the connection terminal 19 and the ground conductor 24.
When inspecting the small lightning arrester 34, even if the small lightning arrester 34 is buried between the The lightning arrester element 34 attached to the tip of the knob 30 can be visually inspected after being taken out of the case 1, which has the effect of making handling during inspection simple and quick.

Moreover, after visually inspecting the lightning arrester element 34, when returning it to its original position, simply holding the knob and inserting the tip of the handle into the intervention space A, the lightning arrester element 34 is connected again to the connecting terminal 19 and the ground conductor. 24, and one surface of the element 34 is in direct surface contact with the side surface of the connecting terminal 19, and the other surface is also in direct surface contact with the ground conductor 24. This has the effect of allowing restoration work to be performed easily and quickly.

[Brief explanation of drawings]

The drawings show an embodiment of the present application, and FIG. 1 is a vertical cross-sectional partial view of the community reception equipment, FIG. 2 is a front section with the same part broken, FIG. 3 is a cross-sectional view taken along the - line, and FIG. A cross-sectional view, and FIG. 5 is an exploded perspective view showing the relationship between the knob and the lightning arrester element. 1... Case, 4... Circuit board, 19... Connection terminal, 24... Earth conductor, 30... Knob rod, 3
4...Lightning protection element.

Claims (1)

[Scope of utility model registration request] In the community reception device, a circuit board with an electronic circuit is disposed in the case of the community reception device, and a connection terminal for connecting the center conductor is attached to the circuit board. , A ground conductor is fixed to one side of the connection terminal, which faces the lightning arrester with a space for intervening therebetween, and the tip of the hand-operated knob has electrodes on one side and the other side, respectively. The lightning arrester element is attached so that the electrodes thereof are exposed on one side and the other side of the tip, and the tip of the knob is inserted into the intervention space so as to be freely inserted and removed. A lightning arrester for a communal receiving device, characterized in that, in an inserted state, electrodes on one side and the other side of the lightning arrester element are brought into surface contact with a side surface of the connecting terminal and a surface of the earth conductor facing the connecting terminal, respectively.