JPH0447898Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a cold cathode discharge tube with a resistor used for display purposes such as a pilot lamp, and in particular, the connection between an anti-induction resistor and a stabilizing resistor. The present invention relates to a cold cathode discharge tube with a resistor that has excellent safety and space factors and is easy to handle by devising the position and arrangement.

[Prior art] Conventionally, cold cathode discharge tubes such as neon lamps
As shown in the figure, it has a structure in which a pair of discharge electrodes 3, 3' are hermetically sealed in a glass bulb 4 together with a discharge gas mainly composed of neon, and the discharge electrodes 3, 3' are connected to each other. lead wires 2, 2'
is led out of the tube 4 through a sealing portion 5 formed at one end of the tube 4. The cold cathode discharge tube 1 can be used directly with a commercial AC power source without using a special power supply circuit, so it can be used in various electrical equipment powered by an AC power source, such as a pilot lamp, home appliances, indoor power distribution equipment, etc. It is often used for display purposes.

By the way, the above-mentioned cold cathode discharge tube is driven in a state of glow discharge, and the light emission from the negative glow generated on the surface of the discharge electrode by the above-mentioned discharge is used for display, and a relatively high voltage is required for driving. However, the current flowing through it is extremely small.

Therefore, if the wiring from the power supply circuit to the cold cathode discharge tube is relatively long and is close to other power supply (AC power supply) lines, even if no driving voltage is applied to the cold cathode discharge tube, the wiring A voltage is induced between the discharge electrodes due to the slight distributed capacitance (capacitance) coupling therebetween, which may cause weak discharge light emission. Therefore, in such a case, in order to prevent the induced voltage caused by electrostatic induction from rising above the discharge starting voltage of the discharge tube, the cold cathode discharge tube is equipped with an induction prevention resistor connected in parallel with the discharge tube. It is a cold cathode discharge tube with a resistor.

In addition, since glow discharge has negative voltage-current characteristics in the initial stage of the cold cathode discharge tube, a stabilizing resistor for current limiting is connected in series with the power source. There is a need.

FIG. 4 shows a conventional cold cathode discharge tube 10 with a resistor configured as described above, in which one of the pair of lead wires 2, 2' led out from the bulb 4 of the cold cathode discharge tube 1 (not shown in the figure). 2) Stabilizing resistor 1 for current limiting
Caulk one lead wire 12 of 1 and connect in series,
Furthermore, the other lead wire 12' of the ballast resistor 11
And the other lead wire (2' in the figure) of the cold cathode discharge tube is connected in parallel with the lead wires 9, 9' of one and the other of the induction prevention resistor 8 in a sash-like manner by caulking them, respectively. .

[Problem to be solved by the invention] A cold cathode discharge tube with a resistor having the above structure has an anti-induction resistor installed between one lead wire to which a stabilizing resistor is connected and the other lead wire. Because it is connected in a hanging manner, it not only requires extra space to accommodate the resistor when incorporating it into electrical equipment, but it also obstructs the opening of both lead wires of the discharge tube, making installation difficult. Furthermore, it becomes difficult to cover the starting end of the lead wire with an insulating member such as an insulating tube, which makes the work complicated and may reduce safety.

The present invention was devised in view of the above points, and by devising the connection and arrangement of the anti-induction resistor and the stabilizing resistor, it saves extra space for storing the resistor when incorporated into electrical equipment, etc. The purpose of the present invention is to provide a cold cathode discharge tube with a resistor that is excellent in space factor without being required, is easy to use, and has excellent safety.

[Means for Solving the Problems] The above-mentioned object is to hermetically seal a pair of discharge electrodes each having a lead wire together with a discharge gas in a tube, and to crush one end of the tube from both sides to form a sealed portion and a tube. An anti-induction resistor is connected in parallel to a cold cathode discharge tube in which steps are formed on both sides of the sealing part and the lead wire is guided out of the bulb by passing through the sealing part, and a stabilizing resistor is connected in parallel. In a cold cathode discharge tube with resistors connected in series, an anti-induction resistor connected in parallel between the lead wires is disposed on the step part on one side of the sealing part, and the anti-induction resistor is connected in parallel between the lead wires. This is achieved by a resistor-equipped cold cathode discharge tube characterized in that a stabilizing resistor connected in series to one lead wire is disposed in the stepped portion of the resistor.

[Function] As described above, the cold cathode discharge tube with a resistor of the present invention has an anti-induction resistor connected in parallel between the lead wires at the stepped portion on one side of the sealing portion of the bulb, and By arranging a stabilizing resistor connected in series to one lead wire on the stepped part on the other side of the stopping part, the space factor can be reduced without requiring extra space to accommodate the resistor when incorporating it into electrical equipment, etc. In addition, it is possible to attach an insulating member such as an insulating tube to the starting end of the lead wire without losing the flexibility of opening the lead wire.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

1 to 3 show a cold cathode discharge tube with a resistor according to the present invention, FIG. 1 is a side view, FIG. 2 is a front view,
FIG. 3 is a rear view, and in the figure, the cold cathode discharge tube 1 is connected to a pair of opposing discharge electrodes 3, 3', with lead wires 2, 2' connected in the same direction, to a rare gas such as neon (Ne). It is constructed by being hermetically sealed in a glass tube 4 together with a discharge gas mainly composed of.

The tube 4 is crushed from both sides by a pincher or the like at one end to form a sealing portion 5 and stepped portions 6, 6' on both sides of the sealing portion 5. The lead wires 2, 2' are led out of the bulb 4 through the tube. Note that 7 is a chip portion formed at the other end of the bulb 4, in which evacuation and discharge gas are filled.

Further, the lead-out starting end 2 of the pair of lead wires 2, 2
The lead wires 9 and 9' of the anti-induction resistor 8, which is a P-type carbon film resistor, are connected in parallel to a and 2a' by soldering or welding, respectively, so that they do not get in the way when installed in equipment, etc. An anti-induction resistor 8 whose shape and dimensions are selected to fit within the step 6 on one side of the sealing portion 5 of the bulb 4 is disposed in the step 6.

Further, 11 is a current limiting stabilizing resistor made of a P-type carbon film resistor for stabilizing the discharge current flowing through the cold cathode discharge tube 1, and is connected in series to one lead wire 2 of the cold cathode discharge tube 1. The shape and dimensions are selected so as to connect and fit within the stepped portion 6' on the other side of the sealing portion 5, and the sealing portion 5 is disposed in the stepped portion 6'.

The above configuration constitutes the resistor-equipped cold cathode discharge tube 10 of the present invention. Since both the anti-induction resistor 8 and the stabilizing resistor 11 fit within the maximum external dimensions of the cold cathode discharge tube 1, it becomes possible to install it in a narrow space inside the equipment when it is incorporated into electrical equipment, etc. This makes handling even easier.

Although not shown, it is also possible to use a chip type resistor as a stabilizing resistor, but with this, the size of the stabilizing resistor becomes large due to the large power supply voltage and power consumption, and it is not possible to use a P-type carbon film resistor. This is advantageous when the discharge tube cannot be accommodated in the stepped portion and protrudes beyond the maximum external dimension of the discharge tube.

[Effects of the invention] As detailed above, the cold cathode discharge tube with a resistor of the present invention has an anti-induction resistor connected in parallel between the lead wires in the stepped part on one side of the sealing part of the tube. In addition, by arranging a stabilizing resistor connected in series to one lead wire on the step on the other side of the sealing part, it not only prevents discharge light emission due to electrostatic induction but also makes it easier to store the resistor. The space factor is improved without requiring extra space, making it possible to install in narrow spaces inside the device, and allowing the lead wire to be freely formed without losing the flexibility of opening the legs. It is easy to assemble into a device, etc., and an insulating member such as an insulating tube can be attached to the lead-out starting end of the lead wire, resulting in excellent safety.

[Brief explanation of the drawing]

Figure 1 is a side view showing a cold cathode discharge tube with a resistor of the present invention, Figure 2 is a front view of a cold cathode discharge tube with a resistor of the present invention, and Figure 3 is a cold cathode with a resistor of the present invention. FIG. 4 is a rear view of the discharge tube, and FIG. 4 is a front view of a conventional cold cathode discharge tube with a resistor. 1... Cold cathode discharge tube, 2, 2'... Lead wire,
4...Tube, 5...Sealing part, 6, 6'...Step part,
8...Induction prevention resistor, 10...Cold cathode discharge tube with resistor, 11...Stability resistor.

Claims (1)

[Scope of utility model registration request] A pair of discharge electrodes, each having a lead wire, is hermetically sealed in a tube along with a discharge gas, and one end of the tube is crushed from both sides to form a sealed portion and a stepped portion on both sides of the sealed portion. In a cold cathode discharge tube with a resistor, an anti-induction resistor is connected in parallel to the cold cathode discharge tube in which the lead wire is guided out of the tube by passing through the sealing part, and a stabilizing resistor is connected in series. An anti-induction resistor connected in parallel between the lead wires is arranged in the stepped portion on one side of the sealed portion, and an anti-induction resistor connected in series with one lead wire is placed in the stepped portion on the other side of the sealed portion. A cold cathode discharge tube with a resistor, characterized in that a resistor is arranged.