JPH0117835Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fixed resistor with a discharge gap in which a discharge electrode is provided on the outer surface of the electrode of the resistor.

Traditionally, the parallel circuit between the discharge gap and the resistor is
It is often used in coupling circuits between the tuner section of television receivers and antennas, etc., and abnormal voltages of several kV to several + kV induced in antennas, etc. are safely discharged and sent to the ground using a discharge gap. .

FIG. 1 is an electrical connection diagram between an antenna input terminal and an output terminal using a parallel circuit of a discharge gap and a resistor.

In the figure, 1 is a shield that surrounds the circuit between antenna input terminal 2 and output terminal 3, and antenna input terminal 2 and output terminal 3 are connected by a parallel circuit of resistor 4, capacitor 5, and discharge gap 6. ing. One end of the parallel circuit of resistor 7 and discharge gap 8 is connected between the output terminal 3 and the parallel circuit of resistor 4, capacitor 5, and discharge gap 6, and the other end is grounded (not shown). It is connected to the. Further, both terminals of a through-type capacitor 9 are connected to the output terminal 3.

The electrical wiring diagram shown in FIG. 1 generally consisted of discrete components. In other words, a discharge gap and electrodes were provided on the printed circuit board, and a resistor and capacitor were further mounted.

Therefore, in order to reduce the size, it is possible to use a composite part that integrates several types of parts. If the composite parts could be connected directly to the terminals, a printed circuit board would be unnecessary and the number of parts could be reduced, which would be an advantage.

For example, in FIG. 1, the parallel circuit of resistor 4, capacitor 5, and discharge gap 6 can be constructed as a printed circuit on a ceramic dielectric substrate. However, the feedthrough capacitor 9 is required to be a distributed constant type feedthrough capacitor with good high frequency characteristics for the purpose of shielding 1 and noise removal.

As a result, if a lumped constant circuit printed on a ceramic substrate is used instead of the feedthrough capacitor 9, resistor 7, and discharge gap 8, disadvantages arise in terms of frequency characteristics, structure, and performance. Therefore, the use of the feedthrough capacitor 9 in conjunction with the output terminal 3 has become essential. Therefore, for the parallel circuit of the resistor 7 and the discharge gap 8, a rectangular gap 13 is provided between the copper patterns 11 and 12 on the printed circuit board 10, as shown in FIG.
2 through a resistor 14, lead wires 15, 1
It was necessary to use the one connected in step 6.

That is, even if composite parts are used to downsize the configuration of the electrical wiring diagram shown in FIG. 13 and resistor 14 must be used, which has the disadvantage that the effect of miniaturization is small and the use of composite parts does not reduce the cost.

SUMMARY OF THE INVENTION In view of the above drawbacks, the present invention aims to provide a fixed resistor with a discharge gap that has a simple structure, is miniaturized, and is inexpensive.

In order to achieve the above object, the present invention covers both ends of a fixed resistor material with cap-shaped electrodes, coats an insulating material on the exposed part of the fixed resistor material between the electrodes, and applies a cylindrical discharge to both electrodes. The structure is such that it is covered with an electrode for use.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a sectional view of a fixed resistor with a discharge gap according to an embodiment of the present invention.

In the figure, 17 is a cap-shaped electrode 1 on both ends.
This is a cylindrical fixed resistor material into which 8 and 19 are press-fitted, and an insulating material 2 that can withstand a sufficiently high voltage is provided in the exposed part between the electrodes 18 and 19 of the fixed resistor material 17.
0 is applied. Cap-shaped discharge electrodes 21 and 22 shown in FIG. 4 are provided on the outer surfaces of the electrodes 18 and 19.
is press-fitted. And discharge electrodes 21, 22
The distance between the edge portions 23 and 24 around each opening is the discharge gap length G.

With this configuration, the gap length G can be adjusted to the edge portions 23 and 24 of the discharge electrodes 21 and 22.
Since the gap length G can be set based on the distance between the G and G, it is much easier to set the gap length G than in the conventional case where the gap length is set by providing a gap in the printed circuit board.

Further, the edge portions 23 and 24 are connected to the discharge electrode 21,
Since the area around the opening of 22 can be effectively used, there is an advantage that the discharge starting voltage is always uniform.
Since the surface area is larger than that of Nos. 8 and 19, the heat dissipation effect is excellent and the thermal margin is also improved. Furthermore, unlike the conventional method, there is no need to use a printed circuit board with a gap for the discharge gap, resulting in a reduction in cost.

Figure 5 shows lead wires 25,
26 is a perspective view of the welded state. The fixed resistor material 17 and the discharge electrode 2 have the configuration shown in the figure.
1 and 22 can be directly connected to other terminals, eliminating the need for a printed circuit board and greatly contributing to cost reduction.

FIG. 6 is a sectional view of a fixed resistor with a discharge gap according to another embodiment of the present invention.

As shown in the figure, cap-shaped electrodes 28 and 29 are press-fitted into both ends of the cylindrical fixed resistor material 27, and an insulating material 30 is inserted into the exposed portion of the fixed resistor material 27.
is coated. The discharge electrodes 31 and 32 have a cylindrical shape with both ends open, and are press-fitted into the outer surfaces of the electrodes 28 and 29. There are edge parts 33 and 34 for discharge on the opposing surfaces of the discharge electrodes 31 and 32, and by making the discharge electrodes 31 and 32 into a cylindrical shape with openings at both ends, it can be used regardless of the length of the fixed resistor material 27. This is the distance between the edge portions 33 and 34. Gap
Setting G' becomes very easy. In this embodiment as well, there is no need to use a printed circuit board with a gap for the discharge gap, resulting in cost reduction.

FIG. 7 is a perspective view of the fixed resistor with a discharge gap shown in FIG. 6, with lead wires 35 and 36 welded to both bottom surfaces of the electrodes 28 and 29. By adopting such a configuration, the parallel circuit of the fixed resistor material 27 and the discharge electrodes 31 and 32 can be directly connected to other terminals, eliminating the need for a printed circuit board, and greatly contributing to cost reduction.

As described above, the present invention covers both ends of a fixed resistor material with cap-shaped electrodes, covers the exposed part of the fixed resistor material between the two electrodes with an insulating material, and has a cylindrical shape on the outer surface of both electrodes. By press-fitting the discharge electrode, it is possible to provide a fixed resistor that is easy to set the gap length and that is compact and inexpensive.

[Brief explanation of the drawing]

Figure 1 is an electrical connection diagram between the antenna input terminal and output terminal, Figure 2 is a perspective view of a conventional fixed resistor and discharge gap, and Figure 3 is an embodiment of the present invention with a discharge gap. Figure 4 is a cross-sectional view of the fixed resistor, Figure 4 is a perspective view of the discharge electrode used in the fixed resistor with discharge gap, and Figure 5 is the fixed resistor with discharge gap with lead wires welded to both ends. FIG. 6 is a sectional view of a fixed resistor with a discharge gap according to another embodiment of the present invention, and FIG. 7 is a perspective view of the same fixed resistor with a discharge gap with lead wires welded to both ends. be. 17, 27...Fixed resistor material, 18, 19,
28, 29... Electrode, 20, 30... Insulating material, 2
1, 22, 31, 32...discharge electrode, 25, 2
6, 35, 36... Lead wire.

Claims (1)

[Scope of utility model registration request] A fixed resistor material, a cap-shaped electrode provided at both ends of the fixed resistor material, an insulating material applied to an exposed portion of the fixed resistor material between the two electrodes, and an outer surface of the electrode. A fixed resistor with a discharge gap consisting of a cylindrical discharge electrode whose inner surface is in contact.