JPH08298096A - Electrode for low pressure discharge lamp and manufacture thereof - Google Patents

Abstract

PURPOSE: To ensure a long flashing life even in lighting with a high frequency lighting device with no preheating time control function by connecting a main electrode and an auxiliary electrode in series, and applying high frequency voltage and passing preheating current at the same time at starting. CONSTITUTION: A main electrode 1 and an auxiliary electrode 6 are connected in series, and at starting, voltage is applied across the electrodes and preheating current is supplied to the electrodes at the same time to heat them, and thermoelectrons are emitted to light a discharge lamp. Even when the lamp is lit with a high frequency lighting device having no preheating time control function, when preheating current is supplied to the electrode 1 and the electrode 6, the electrode 6 has smaller heat capacity than the electrode 1, quickly increases temperature than the electrode 1, and thermoelectrons are emitted to start lighting, and ion shock to the cathode is remarkably decreased in starting. Even when the lamp is lit with the high frequency lighting device with no preheating time control function, long flashing life is ensured, the electrode 6 is formed by only changing the diameter of a filament, and manufacture is made easy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low pressure discharge lamp electrode and a method for manufacturing the same.

[0002]

7 to 11 show a low pressure discharge lamp using a conventional electrode for a low pressure discharge lamp (first conventional example). This low pressure discharge lamp is a preheat start type fluorescent lamp. And the electrode is the main electrode 1 coated with an electron emissive material.
Is formed by performing an activation process on the inner surface of the arc tube 2 in which a discharge gas containing, for example, mercury gas or argon gas is sealed, and is supported by a pair of lead wires 3.

Generally, in order to light a fluorescent lamp, which is a low-pressure discharge lamp, a current limiting element called a ballast is required because of its discharge characteristics. Therefore, when lighting the low-pressure discharge lamp configured as described above at a low frequency such as a commercial frequency, a choke coil 4a is used as the ballast 4 as shown in FIG. Discharge lamp L
To start a, a starting switch 5 called a glow starter is used.

Then, with the starting switch 5 closed, a current about 1.5 times the discharge current is passed through the main electrode 1 to heat the main electrode 1 sufficiently, and then the starting switch 5 is opened. As a result, the kick voltage generated at both ends of the choke coil choke coil 4a which is the ballast 4 is applied to both ends of the fluorescent lamp La to start the fluorescent lamp La. When this glow starter is used, the power supply AC
Is supplied, a preheating current flows through the main electrode 1 and the main electrode 1
Is sufficiently heated to emit thermoelectrons and, as shown in FIG. 9, discharge A is generated at both ends of the main electrode 1,
The fluorescent lamp La starts in about 1-2 seconds.

In recent years, an electronic switch has been used instead of the glow starter as the starting switch 5. The electronic starter switch, called the electronic starter, controls the preheating time, so the glow starter flashes tens of thousands of times to cause a lamp failure, while the electronic starter switches the starter to hundreds of thousands of times. Blinking is possible and the blinking life can be extended. When this electronic starter is used, the time required to start the fluorescent lamp La is about 0.8 seconds.

As a ballast, a high-frequency lighting device called an electronic ballast or an inverter ballast has been used for the purpose of improving efficiency. There are various circuit systems for this high-frequency lighting device,
A circuit type high frequency lighting device 4b in which a capacitor C is connected between one ends of the main electrode 1 as shown in FIG.

This type of circuit type high frequency lighting device 4b
Rectifies and smoothes the AC power supply AC, converts it into a high frequency, and starts and lights the fluorescent lamp La. The high frequency lighting device 4b includes a control unit (not shown), and the control unit At the time of starting, the voltage applied across the fluorescent lamp La is lowered to such an extent that the lamp does not start, and the main electrode 1
There is a control for heating the lamp and then raising the voltage to several hundred volts to start the fluorescent lamp La, and a control for not simplifying the circuit. In the high-frequency lighting device 4b having no control unit, a voltage of several hundred volts is applied between the main electrodes 1 at both ends of the fluorescent lamp La as soon as the power supply AC is turned on, and at the same time, the main electrode 1 A preheating current flows through the fluorescent lamp La, and the fluorescent lamp La starts in about 0.3 seconds.

That is, in the high frequency lighting device 4b of this type of circuit system, a voltage of several hundreds of volts is applied between both ends of the fluorescent lamp La at the same time when the power supply AC is turned on, and the voltage causes the voltage to be in the vicinity of the main electrode 1. As shown in FIG. 11, a discharge (plasma) B different from the thermoelectron discharge in the case of using the glow starter is generated, and the fluorescent lamp La is started. It is presumed that this discharge was caused by the voltage applied across the lamp, not by thermionic discharge as in the case of using a glow starter.

This means that in this type of lighting system, the fluorescent lamp is lit by cold cathode starting as described above, and when the lamp is cold cathode starting, ion bombardment of the cathode at the time of starting is caused. As a result, the flashing life becomes worse.

FIG. 12 shows another conventional low-pressure discharge lamp electrode (second conventional example) disclosed in Japanese Examined Patent Publication No. 39-20120. This low-pressure discharge lamp electrode is a first electrode. The auxiliary electrode 6 that is rapidly heated at the time of starting is provided in parallel with the main electrode 1 supported by the pair of lead wires 3 in the conventional example, and the other configurations are the same as those of the first conventional example. There is.

The auxiliary electrode 6 is an electrode having a low heat capacity and is oriented so as to increase the length of the discharge path.
In contrast, the main electrode 1 is provided on the end side of the arc tube, and the main electrode 1 has a filament that obtains sufficient power for operation within a range of approximately 800 ° C to 830 ° C and is heated to a radiation temperature. It takes about 6 seconds, while the auxiliary electrode 6 has about 8
Maintain a stable temperature in the range of 60 ° C to 900 ° C,
It is designed to reach an operating condition of holding electron emission and arc in about 1 to 0.5 seconds.

FIG. 13 shows another conventional low-pressure discharge lamp electrode (third conventional example) disclosed in Japanese Unexamined Patent Publication No. Sho 50-8386. An auxiliary electrode 6 is provided in series with the main electrode 1 so that a high power fluorescent lamp or the like can be started and lit by a single choke coil using a glow switch at a commercial frequency. At the time of starting, the main electrode 1 and the auxiliary electrode 6 are provided. The preheating current flowing through the device is made smaller than the discharge current during lighting.

The auxiliary electrode 6 is formed of a member having a wire diameter smaller than that of the main electrode 1, and is connected so as to be sandwiched between the two main electrodes 1. The auxiliary electrode 6 and the main electrode 1 are A pair of lead wires 7 used only during the activation process are provided from both ends of the auxiliary electrode 6 so that the activation processes can be performed separately. A resistor is connected outside the arc tube 2 between a pair of electrodes arranged at both ends of the arc tube 2, and flows through the resistance to the main electrode 1 and the auxiliary electrode 6 which are electrodes at the time of starting. The preheating current is made smaller than the discharge current during lighting. At this time, only the auxiliary electrode 6 is heated by the preheating current and the lamp is started.

[0014]

However, in the electrode for a low pressure discharge lamp shown in the first conventional example constructed as described above, the lamp has a high frequency lighting device 4b which does not have a control unit for controlling the preheating time. In the case of being lit by, the fluorescent lamp is lit for about 0.3 seconds, which is a short time which is not sufficient for heating the main electrode 1, and the plasma is generated in the vicinity of the main electrode 1. Since it exists, the preheating current that originally flows through the main electrode 1 to heat the main electrode 1 mostly flows through the plasma and the main electrode 1 becomes insufficiently heated, resulting in increased ion bombardment and blinking of the lamp. There was a problem that the life was shortened.

Further, in the low pressure discharge lamp electrode shown in the second conventional example, the main electrode 1 and the auxiliary electrode 6 are connected in parallel, and the current values required for their activation processing are different, so that the same voltage is applied. So that the activation process can be performed by the main electrode 1
Unless the respective resistance values of the auxiliary electrode 6 and the auxiliary electrode 6 are set, it is necessary to separately perform the activation processing before they are housed in the arc tube 2, for example, in a vacuum, and the activation processing takes time. There was a problem that workability was poor.

The electrode for a low pressure discharge lamp shown in the third conventional example is for lighting an ultra high output type or high output type low pressure discharge lamp at a commercial frequency using a glow starter. .

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a low-voltage discharge having a long flashing life even when it is turned on by a high-frequency lighting device that does not have a function of controlling the preheating time. Another object of the present invention is to provide an electrode for an electric lamp, and another object thereof is to provide a method for manufacturing an electrode for a low-pressure discharge lamp, which has good workability in manufacturing.

[0018]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides an invention as set forth in claim 1, in which an electron discharger emissive material is carried to achieve at least one lighting life.
It has one main electrode 1 and at least one auxiliary electrode 6 which carries an electron emissive substance and which is electrically heated at the time of starting and starts discharge to start discharge, and at the same time a high frequency voltage is applied at the time of starting and preheating. An electrode for a low-pressure discharge lamp that is started by passing an electric current, the main electrode 1 and the auxiliary electrode 6 being
Are connected in series, and at the time of starting, a preheating current larger than a discharge current at least during lighting is passed through the main electrode 1 and the auxiliary electrode 6 to heat the auxiliary electrode 6. Is.

According to the invention of claim 2, claim 1
In the low-pressure discharge lamp electrode described, the auxiliary electrode 6 is
The main electrode 1 is formed of a wire thinner than the main electrode 1, and an auxiliary electrode 6 is connected in series to one end of the main electrode 1.

According to the invention of claim 3, claim 1
In the low-pressure discharge lamp electrode described, the auxiliary electrode 6 is
The main electrode 1 is formed of a wire thinner than the main electrode 1, and one main electrode 1 is connected in series to both ends of the auxiliary electrode 6, respectively.

According to a fourth aspect of the invention, the main electrode 1 carrying an electron emissive substance and operating at the time of lighting is provided, and a high frequency voltage is applied at the time of starting, and at the same time a preheating current is made to flow to start. An electrode for a low-pressure discharge lamp, which is provided near the main electrode 1, is provided with an auxiliary electrode 6 having a small heat capacity for carrying an electron emissive substance and being heated at the time of starting to start a discharge. It is characterized in that it is connected to one end of the electrode 1.

According to the invention of claim 5, claim 2
The method for manufacturing a low-pressure discharge lamp electrode according to claim 1, wherein the low-pressure discharge lamp electrode having an activation processing control means 8 connected in parallel with the auxiliary electrode 6 is connected to a constant current power source to be energized, and the main electrode 1 And the auxiliary electrode 6 are activated at the same time,
The low-pressure discharge lamp electrode is formed by separating the activation control means 8.

According to the invention of claim 6, claim 5
In the method for manufacturing an electrode for a low-pressure discharge lamp described above, the activation processing control means 8 is a Zener diode ZD having a predetermined breakdown voltage.

According to the invention of claim 7, claim 5
In the method for manufacturing an electrode for a low-pressure discharge lamp described above, the activation processing control means 8 is a resistance R having a predetermined resistance value.

[0025]

With this structure, the present invention provides the invention according to claim 1 in which when a preheating current flows through the main electrode 1 and the auxiliary electrode 6, the heat capacity arranged near the main electrode 1 is small. The auxiliary electrode 6 rises in temperature faster than the main electrode 1 and emits thermoelectrons to start, so that ion bombardment on the cathode at the time of start is greatly reduced.

According to the invention of claim 2, claim 1
In addition to the function of the electrode for a low-pressure discharge lamp described above, the auxiliary electrode 6 can be formed simply by changing the wire diameter, and is easy to manufacture.

According to the invention of claim 3, claim 1
In addition to the action of the electrode for a low-pressure discharge lamp described above, the auxiliary electrode 6 can be formed by simply changing the wire diameter and is easy to manufacture, and in the low-pressure discharge lamp, regardless of the starting position of the start on the electrode, During lighting, the bright spots move to the ballast side, and unless the main electrode 1 that fulfills the lighting life is connected in that direction, the auxiliary electrode 6 having a small heat capacity becomes too hot and the life becomes relatively short. However, since the auxiliary electrode 6 is sandwiched between the two main electrodes 1, the main electrodes 1 are located at both ends of the low-pressure discharge lamp electrode, and a bright spot is formed on one of the main electrodes 1 to the lighting circuit. The connection direction of is no longer limited.

According to the fourth aspect of the invention, the temperature of the auxiliary electrode 6 having a small heat capacity rises faster than that of the main electrode 1 due to the glow discharge occurring before the start, and the thermoelectrons are emitted to start the operation. The ion bombardment of the cathode at that time is greatly reduced.

In the inventions according to claims 5 to 7, the activation processing control means 8 causes the main electrode 1 and the auxiliary electrode 6 connected in series to perform predetermined activation necessary for each activation. By activating different currents, the activation treatment of the main electrode 1 and the auxiliary electrode 6 can be performed at the same time, and the activation treatment time can be shortened, and when activating one electrode, the other electrode is polluted and the work function rises. Will disappear.

[0030]

1 shows a first embodiment of a low-pressure discharge lamp electrode according to the present invention. This low-pressure discharge lamp electrode has one main electrode 1 and one auxiliary electrode 6, respectively. Is configured.

The main electrode 1 is a coil-shaped filament having a wire diameter of 93 μm, which is used for a general 30 W fluorescent lamp. A pair of buried lead wires 3 (3
A discharge gas such as mercury gas or argon gas is supported by a, 3b) and housed in an arc tube 2 sealed at a predetermined gas pressure.

The auxiliary electrode 6 is made of a wire material having a wire diameter smaller than that of the main electrode 1 and has a small heat capacity. Specifically, a coil-shaped filament having a wire diameter of 50 μm used for a general 10 W fluorescent lamp is used. In addition, an electron emissive material is applied and activated, and one end of the main electrode 1 is connected in series with the main electrode 1. Then, one end is connected to and supported by one introduction line 3 a that supports the main electrode 1, and the other end is connected and supported by a different introduction line 3 c (3) and housed in the arc tube 2. The other lead-in wire 3b supporting the main electrode 1 and the lead-in wire 3c connected only to the auxiliary electrode 6 are led out of the arc tube 2 to serve as terminals.

A fluorescent lamp which is a low-pressure discharge lamp having electrodes for a low-pressure discharge lamp constructed in this way is shown in FIG.
Is connected to a lighting circuit as shown in (1), and at the time of starting, a voltage is applied between the electrodes and at the same time a preheating current is made to flow through the electrodes to heat them, and thermions are emitted to start and light.

With such a configuration, even when a high-frequency lighting device that does not have a function of controlling the preheating time is lit, if the preheating current flows in the main electrode 1 and the auxiliary electrode 6 connected in series, the auxiliary The electrode 6 has a smaller heat capacity than the main electrode 1 and rises in temperature faster than the main electrode 1 to start by emitting thermoelectrons, so-called hot cathode start, and ion impact on the cathode at the time of start is greatly reduced. . Therefore, a long blinking life can be secured even when the electrode is turned on by a high-frequency lighting device that does not have a function of controlling the preheating time, and such an electrode can be manufactured very easily simply by changing the wire diameter of the auxiliary electrode 6. it can.

In this embodiment, the auxiliary electrode 6 having a reduced wire diameter does not need to be formed of an electrode different from the main electrode 1, and a part of the main electrode 1 may be formed with a reduced wire diameter. It may be one.

FIG. 2 shows the second electrode of the low pressure discharge lamp of the present invention.
The difference from the first embodiment is that two main electrodes 1 are provided, and one main electrode 1 is connected in series to both ends of the auxiliary electrode 6 in the first embodiment. Other points are the same as those in the first embodiment.

The auxiliary electrode 6 is formed of a wire material having a wire diameter smaller than that of the main electrode 1 and has a small heat capacity.
The main electrode 1 is a coiled filament with a wire diameter of 50 μm used for a 0 W fluorescent lamp, and a coiled filament with a wire diameter of 93 μm used for a general 30 W fluorescent lamp is connected to both ends of the filament. It has been done. That is, the two main electrodes 1 are respectively supported by a pair of introduction lines 3 (3a, 3b), the auxiliary electrode 6 is connected between one introduction line 3a, and the other introduction line 3b is connected to the arc tube. 2 is led out to the outside and is used as a terminal of the lamp.

With this structure, in the low-pressure discharge lamp electrode of this embodiment, in addition to the effect of the first embodiment, the auxiliary electrode 6 can be formed by simply changing the wire diameter. In addition, in the low-pressure discharge lamp, the bright spot moves to the ballast side during lighting regardless of the starting position on the electrode, and the main electrode 1 that achieves the lighting life in that direction If it is not connected, the auxiliary electrode 6 having a small heat capacity becomes too hot and has a relatively short life, but the auxiliary electrode 6 is sandwiched between the two main electrodes 1, and both ends of the low-pressure discharge lamp electrode are Since the electrode 1 is located and the bright spot is formed on either of the main electrodes 1, the connection direction to the lighting circuit is not limited.

FIG. 3 shows a modified example of the electrode for a low pressure discharge lamp of this embodiment, in which a filament of 30 W is used for the electrode and the central portion of the filament is formed with a thin wire diameter. The same effect as described above is obtained.

FIG. 4 shows the third electrode of the low pressure discharge lamp of the present invention.
The following is an example of the electrode for a low-pressure discharge lamp,
It has a main electrode 1 and an auxiliary electrode 2.

The main electrode 1 is a coil-shaped filament having a wire diameter of 93 μm, which is used for a general 30 W fluorescent lamp. A discharge gas such as mercury gas or argon gas is supported by a pair of buried lead wires 3 and is housed in an arc tube 2 sealed at a predetermined gas pressure.

The auxiliary electrode 6 is a sintered electrode having a small heat capacity, is made by activating an electron emissive material applied to a metal, and is electrically connected to one lead wire 3 which is one end of the main electrode 1. It is connected.

With this structure, in the low-pressure discharge lamp electrode of this embodiment, the temperature of the auxiliary electrode 6 having a small heat capacity rises faster than that of the main electrode 1 due to glow discharge that occurs before starting. Emits thermoelectrons and starts,
Ion bombardment on the cathode at start-up is greatly reduced, and the blinking life can be extended.

FIG. 5 shows a fourth embodiment of the present invention,
FIG. 6 is an explanatory diagram of a method of manufacturing the electrode for a low-pressure discharge lamp in the first embodiment, and particularly shows a state in which the activation processing control means 8 is provided to perform the activation processing of the electrode, and is manufactured as follows. To be done.

First, the main electrode 1 and the auxiliary electrode 6 housed at both ends of the arc tube 2 and connected in series are activated in parallel with the auxiliary electrode 6, that is, between the introduction lines 3a and 3c. As the control means 8, a Zener diode ZD having a breakdown voltage (Zener voltage) of 30V is connected. Then, a constant current power source is connected to both ends of the series circuit of the main electrode 1 and the auxiliary electrode 6, and the main electrode 1 and the auxiliary electrode 6 are simultaneously energized to activate the electrode coated with the electron emissive material.

At this time, when a forward voltage is applied to the Zener diode ZD, no current flows in the auxiliary electrode 6 and the main electrode 1 is relatively passed through the Zener diode ZD to the main electrode 1 so that the activation process can be performed. When a large current flows and a voltage is applied in the opposite direction, the voltage across the Zener diode ZD is maintained at 30V, which is the breakdown voltage, so that the auxiliary electrode 6 receives the current flowing through the main electrode 1 as the Zener diode. Z
The current is divided into the D side and a relatively small current necessary for activation thereof flows. Therefore, the main electrode 1 and the auxiliary electrode 6 are supplied with appropriate currents necessary for the respective activation treatments, and are simultaneously activated, and thereafter the Zener diode ZD which is the activation treatment control means 8 is disconnected. The lead wires 3b and 3c are used as the terminals of the lamp.

With such a configuration, in the method of manufacturing the electrode for a low pressure discharge lamp in this embodiment, the main electrode 1 and the auxiliary electrode connected in series are connected by the Zener diode ZD which is the activation processing control means 8. Predetermined different currents required for activation of the electrodes 6 can be applied to the electrodes 6, and activation of the main electrode 1 and the auxiliary electrode 6 can be performed at the same time.
The activation treatment time can be shortened, and when activating one electrode, the other electrode is not polluted and the work function is not increased (electrons are less likely to be emitted), which facilitates the manufacturing of the electrode.

In this embodiment, the Zener diode ZD having a breakdown voltage of 30 V was used, but this breakdown voltage is caused to flow to the auxiliary electrode 6 at the time of activation processing because the auxiliary electrode 6 is different. Since a proper current value is different, a suitable current value is used, and it is not limited to the above-mentioned 30V.

FIG. 7 is an explanatory view of the fifth embodiment of the present invention. The difference from the fourth embodiment is that the activation processing control means 8 has a zener diode ZD instead of 100.
The point is that a resistor R having an ohmic resistance value is connected, and the other points are configured similarly to the fourth embodiment.

With this structure, in the method for manufacturing the electrode for a low-pressure discharge lamp in this embodiment, a relatively large current necessary for the activation treatment flows through the main electrode 1, while the auxiliary electrode The current flowing through the main electrode 1 is split into a current flowing through the resistor R and a relatively small current flows through the electrode 6. Even with this structure, the same effect as that of the fourth embodiment can be obtained.

In the present embodiment, the value of the resistance R is set to 100 ohms, but this resistance value pressure is different because the auxiliary electrodes 6 are different, that is, a proper current flowing through the auxiliary electrodes 6 during the activation process. Due to the different values, suitable values are used, and are not limited to the above 100 ohms.

In each of the above embodiments, the main electrode 1
As an example, a general 30 W filament was used as the auxiliary electrode 6 and a 10 W filament was used as the auxiliary electrode 6.
The present invention is not limited to this, and the shape of the filament is not limited to the coil shape.

[0053]

As described above, according to the present invention, the preheating current is applied to the main electrode and the auxiliary electrode even when the main electrode and the auxiliary electrode are lit by the high frequency lighting device having no preheating time control function. When flowing, the auxiliary electrode with a small heat capacity arranged near the main electrode rises in temperature faster than the main electrode and emits thermoelectrons to start, greatly reducing the ion bombardment to the cathode at the time of starting. To do. Therefore, a long blinking life can be ensured even when the high-frequency lighting device without the function of controlling the preheating time is turned on.

According to the invention of claim 2, claim 1
In addition to the effects of the invention described, the auxiliary electrode can be formed only by changing the wire diameter, and the manufacturing is easy.

According to the invention of claim 3, claim 1
In addition to the effects of the invention described, the auxiliary electrode can be formed only by changing the wire diameter, is easy to manufacture, and, in a low-pressure discharge lamp, a bright spot during lighting regardless of the starting position on the electrode. Will be transferred to the ballast side, and unless a main electrode that fulfills the lighting life is connected in that direction, the auxiliary electrode with a small heat capacity will be too hot and the life will be relatively short, but there will be two auxiliary electrodes. The main electrodes are sandwiched between the main electrodes, and the main electrodes are located at both ends of the low-pressure discharge lamp electrode, and the bright spot is formed on either of the main electrodes, so that the connection direction to the lighting circuit is not limited.

According to the fourth aspect of the present invention, even when the high-frequency lighting device without the function of controlling the preheating time is turned on, the temperature of the auxiliary electrode having a small heat capacity is reduced due to the glow discharge generated before starting. It rises faster and emits thermoelectrons to start, and ion bombardment on the cathode at the time of start is greatly reduced. Therefore, a long blinking life can be ensured even when the high-frequency lighting device without the function of controlling the preheating time is turned on.

In the inventions according to claims 5 to 7, the activation processing control means applies predetermined different currents required for activation to the main electrode and the auxiliary electrode connected in series. The activation process of the main electrode and the auxiliary electrode can be performed simultaneously, and the activation process time can be shortened. Also, when activating one electrode, the other electrode is not polluted and the work function does not rise. Will be easier to manufacture.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of an electrode for a low pressure discharge lamp of the present invention.

FIG. 2 is a perspective view showing a second embodiment of the low-pressure discharge lamp electrode of the present invention.

FIG. 3 is a perspective view showing a main part of a modified example of the above.

FIG. 4 is a perspective view showing a third embodiment of the low-pressure discharge lamp electrode of the present invention.

FIG. 5 shows a fourth embodiment of the present invention and is an explanatory diagram of a method of manufacturing the electrode for a low-pressure discharge lamp in the first embodiment.

FIG. 6 shows a fifth embodiment of the present invention and is an explanatory view of another method for manufacturing the electrode for a low-pressure discharge lamp in the first embodiment.

FIG. 7 is a perspective view showing a conventional low-pressure discharge lamp electrode (first conventional example).

FIG. 8 is a lighting circuit diagram of the above.

FIG. 9 is a perspective view for explaining a starting state by the above lighting circuit.

FIG. 10 is another lighting circuit diagram of the above.

FIG. 11 is a perspective view illustrating a starting state by the above lighting circuit.

FIG. 12 is a front view showing another conventional low-pressure discharge lamp electrode (second conventional example).

FIG. 13 is a front view showing a main part of still another conventional low-pressure discharge lamp electrode (third conventional example).

[Explanation of symbols]

 1 Main Electrode 6 Auxiliary Electrode 8 Activation Process Controlling Means R Resistance ZD Zener Diode

Claims (7)

[Claims] 1. At least one main electrode that carries an electron emissive material and has a long operating life, and at least one auxiliary electrode that carries an electron emissive material and has a low heat capacity that is electrically heated at the time of starting to start discharge. An electrode for a low-pressure discharge lamp, which is started by applying a high-frequency voltage at the same time as a high-frequency voltage is applied at the time of starting, and connecting the main electrode and the auxiliary electrode in series, at the time of starting, A low-pressure discharge lamp electrode, characterized in that a preheating current larger than a discharge current at the time of lighting is applied to the main electrode and the auxiliary electrode to heat the auxiliary electrode. 2. The low-pressure discharge lamp according to claim 1, wherein the auxiliary electrode is formed of a wire material thinner than the main electrode, and the auxiliary electrode is connected in series to one end of the main electrode. electrode. 3. The low-voltage discharge according to claim 1, wherein the auxiliary electrode is formed of a wire thinner than the main electrode, and one main electrode is connected in series to both ends of the auxiliary electrode. Electrodes for electric lights. 4. An electrode for a low-pressure discharge lamp, comprising a main electrode which carries an electron emissive substance and which operates at the time of lighting, and which is started by applying a high-frequency voltage at the same time as starting and by supplying a preheating current to the main electrode. A low-voltage discharge characterized in that an auxiliary electrode, which carries an electron emissive substance and has a small heat capacity for starting discharge when heated by starting, is provided in the vicinity of the main electrode, and the auxiliary electrode is connected to one end of the main electrode. Electrodes for electric lights. 5. The method of manufacturing an electrode for a low-pressure discharge lamp according to claim 2, wherein the electrode for the low-pressure discharge lamp, which has activation processing control means connected in parallel with the auxiliary electrode, is connected to a constant-current power source for energization. Then, the method for producing a low-pressure discharge lamp electrode is characterized in that the activation control means is disconnected and the low-pressure discharge lamp electrode is formed after simultaneously performing the activation treatment of the main electrode and the auxiliary electrode. 6. The method of manufacturing an electrode for a low-pressure discharge lamp according to claim 5, wherein the activation processing control means is a Zener diode having a predetermined breakdown voltage. 7. The method of manufacturing an electrode for a low-pressure discharge lamp according to claim 5, wherein the activation processing control means is a resistance having a predetermined resistance value.