JPH01144559A - Neon lamp - Google Patents

Abstract

PURPOSE:To improve the surge resistance performance by inserting and fixing a resistor serving as the ballast resistor of a neon tube into an insulating plate at the bottom of a base and covering it with insulating resin. CONSTITUTION:A bar-shaped resistor 5 serving as the ballast resistor of a neon tube 3 is inserted and arranged into an opening 4a provided at the center of an insulating plate 4. An electrode 5a of the resistor 5 is welded to the lead 3a of the tube 3, and an electrode 5b is exposed to the outside. The gap between a base 2 and the electrode 5a is covered with insulating resin 6. The inside of the base 2 is completely insulated from the electrode 5b having a large voltage load, and the surge resistance performance is improved.

Description

[Detailed Description of the Invention] [Field of Medical Application] The present invention relates to a neon lamp mainly used to indicate power in an electric circuit, and particularly to a neon lamp that improves surge resistance performance against surge voltages generated by the electric circuit. The present invention relates to the structure of a neon lamp.

[Conventional technology]

2. Description of the Related Art Display devices used to display power in electric circuits are becoming smaller as various devices become smaller.

Conventionally, neon lamps, incandescent light bulbs, light emitting diodes, and the like have been used as light sources to indicate the power supply of electric circuits, but the circuit voltage of the electric circuit is 100V.

For relatively high lamps such as 200 square meters, neon lamps are used for the following reasons.

That is, for incandescent light bulbs, for manufacturing reasons, the size of the incandescent light bulb that corresponds to the electric circuit inevitably becomes large due to the circuit voltage. Also, by combining series resistors, the voltage may be divided and borne by a small incandescent light bulb, but since the conducting current is as large as several tens of milliamps, an extremely large resistor is required, making it difficult to miniaturize. Can not. (0) Light-emitting diodes (LEDs) require a current of tens to several tens of mA to ensure appropriate brightness, and the forward voltage of the light-emitting diode is small, so the incandescent Similar to light bulbs, large resistors are required, and miniaturization is not possible.

On the other hand, in the case of an e→neon lamp, the stable discharge current is as small as 1 mAQ, so that a small resistor can be used as a series resistance.

For these reasons, the general structure of a small neon lamp, which is often used as a light source for power display, etc., will be explained with reference to FIG. Note that FIG. 3 is a circuit diagram of the urine on-lamp illustrated in FIG. 2.

In FIG. 2, reference numeral 2 denotes a cylindrical base that serves as one electrode of a neon lamp 7. A neon tube 3 is fitted into the upper part of the base so as to be in contact with its inner wall, and an insulating plate 4 is installed at the bottom. Fixed. Furthermore, two lead wires 3a and 3b are led out from the neon tube 3. The lead wire 3a is connected to the insulating plate 4
It is soldered through the opening 9a of the eyelet 9 which is caulked.

This soldered portion 10 becomes the other electrode of the neon lamp 7. The lead wire 3b is electrically connected to one lead wire 8b of a resistor 8 housed inside the base 2. The other lead wire 8C of the resistor 8 is soldered to the inner wall of the base 2.

[Problem that the invention seeks to solve]

However, the conventional neon lamp 7 configured as described above has the following problems.

That is, the neon lamp 7 is often used to display the main circuit power supply voltage, but usually a coil such as an electromagnetic switch is connected to the main circuit, and when switching the coil from the ON state to the OFF state, the Sometimes 3kV due to the energy stored in the coil.

A high surge voltage of 4kV is generated. For this reason, in the base 2 of the neon lamp 7, there is a possibility that both ends of the resistor 8 with a large voltage load (the part indicated by the mark in FIG. 3), or the inner wall of the base 2 and the lead wire 3a, or the inner wall of the base 2, A short circuit occurs between the eyelets 4 (the part indicated by ■ in FIG. 3). If a fuse (not shown) is connected in front of the circuit shown in FIG. There is a problem in that the fuse blows out and the other circuits do not work, causing the device to stop functioning.

Note that as a method for preventing the above-mentioned short circuit, there is a known method of pouring insulating resin into the inside of the cap 2 of the neon lamp 7, but the inside of the cap 2 may be narrow (and the lead wires 3a, 3b and resistor 8, etc., the base 2
It is difficult to completely fill every corner of the interior with resin, which not only causes variations in surge resistance performance, but also makes the resin filling process extremely complicated.

The present invention has been made in view of the above problems, and an object thereof is to provide a neon lamp with high surge resistance.

[Means for solving problems]

The above purpose is to provide a neon tube with a pair of lead wires,
In a neon lamp comprising a cylindrical base into which the neon tube is inserted, an insulating plate fixed to the bottom of the base, and a resistor serving as a stable resistance for the neon tube, the resistor is placed at both ends. A rod-shaped resistor having an electrode is passed through an opening provided in the center of the insulating plate so that one electrode is housed inside the base, and the other electrode is inserted externally from the insulating plate. placed so that it is exposed to
Connecting one lead wire of the neon tube to an electrode of a rod-shaped resistor located inside the cap, covering the electrode with an insulating resin, and connecting the other lead wire of the neon tube to the inner wall of the cap. This is achieved by

[Function] According to the present invention, one electrode housed inside the cap of the resistor is covered with an insulating resin, so that the two electrodes at both ends of the resistor, which have a large voltage load, are completely insulated. This will improve the surge resistance of neon lamps.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

FIG. 1 shows a neon lamp showing an embodiment of the present invention. In FIG. 1, reference numeral 2 denotes a cylindrical base that serves as one electrode of the neon lamp 1. A neon tube 3 is fitted into the upper part of the base so as to be in contact with its inner wall, and an insulating plate 4 is fixed to the bottom part. ing.

Reference numeral 5 denotes a rod-shaped resistor that serves as a stabilizing resistance for the neon tube 3. It has electrodes 5a and 5b at both ends, and one electrode 5a passes through an opening 4a provided in the center of the insulating plate 4. The electrode 5b is housed inside and is arranged so that the other electrode 5b is exposed to the outside from the insulating plate 4.

Also, a pair of lead wires 3a are connected to the neon tube 3.

3b is led out, one lead wire 3a is soldered to one pole 5a of the resistor 5, and the other lead wire 3b
is soldered to the inner wall of the base 2.

Roughly speaking, one electrode 5a housed inside the base 2 of the resistor 5 is covered with an insulating resin 6 to provide insulation.

In the neon lamp 1 configured as described above, only the neon tube 3 bears the voltage inside the base 2, and the voltage burden on the neon tube 3 is very small compared to the voltage burden on the resistor 5. Therefore, the anti-surge performance of the neon lamp 1 depends on how completely the electrode 5b exposed to the outside of the resistor 5, which carries a large voltage load, is insulated from the inside of the base 2. That is, by covering one electrode 5a housed inside the base 2 of the resistor 5, which is disposed through the center of the insulating plate 4, with an insulating resin, it is possible to separate the inside of the base 2 and the voltage burden. In the neon lamp 1 of this embodiment in which the resistor 5 and the other electrode 5b are completely insulated, extremely high anti-surge performance can be obtained. According to an experiment, the above neon lamp 1 has a voltage of about 5kV.
It has been confirmed that it has a certain level of surge resistance.

Note that it is preferable to attach a metal fitting to the electrode 5b of the resistor 5, which is one electrode of the neon lamp 1, or to apply solder to the electrode 5b to prevent poor contact with the mating socket.

〔Effect of the invention〕

According to the present invention, there is provided a neon tube from which a pair of lead wires are led out, a cylindrical cap into which the neon tube is inserted, an insulating plate fixed to the bottom of the cap, and a stabilizing resistor of the neon tube. In a neon lamp comprising a resistor,
The resistor is a rod-shaped resistor having electrodes at both ends, and the rod-shaped resistor is passed through an opening provided in the center of the insulating plate so that one pole is housed inside the base, and the other pole is housed inside the base. The electrode is arranged so as to be exposed to the outside from the insulating plate, and one lead wire of the neon tube is connected to the electrode of the rod-shaped resistor located inside the 40-karat gold, and the electrode is covered with an insulating resin. Since the neon tube is covered and the other lead wire of the neon tube is connected to the inner wall of the cap, the following effects are achieved.

(1) Since the electrodes of the resistor, which bear a large voltage load, are completely insulated, it is possible to obtain a neon lamp with extremely good anti-surge performance.

(2) Since it is only necessary to cover one electrode housed inside the cap of the resistor with insulating resin, the work to insulate it is as simple as applying a relatively high viscosity insulating paint. Become something. Moreover, this makes it possible to reduce production costs and to reduce variations in surge resistance performance.

(3) There are only two parts that require soldering, compared to three in conventional neon lamps.
It can also be expected to improve the reliability of neon lamps.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a main part of a neon lamp showing an embodiment of the present invention, Figure 2 is a cross-sectional view of a main part of a neon lamp according to the prior art, and Figure 3 is a circuit diagram of the neon lamp shown in Figure 2. . 1; Neon lamp, 2: Base, 3; Neon tube, 3a, 3
b: Lead wire, 4; Insulating plate, 4a; Opening 5: Resistor, 6
;Insulating resin. Agent j + Riju Yamaguchi Yu ゛ /f 2019 Zun Lamp Paper 1 Kato Z Shoukatsu 3 (!Il

Claims (1)

[Claims] 1) A neon tube from which a pair of lead wires are led out, a cylindrical cap into which the neon tube is inserted, an insulating plate fixed to the bottom of the cap, and a resistor serving as a stabilizing resistance for the neon tube. In the neon lamp, the resistor is a rod-shaped resistor having electrodes at both ends, and the rod-shaped resistor is passed through an opening provided in the center of the insulating plate so that one electrode is housed inside the base. and the other electrode is exposed to the outside from the insulating plate, and one lead wire of the neon tube is connected to an electrode of a rod-shaped resistor located inside the cap, and the electrode is connected to an insulating plate. A neon lamp, characterized in that the neon lamp is covered with a resin and the other lead wire of the neon tube is connected to the inner wall of the base.