JPS62213094A - Discharge lamp burner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to improving the characteristics of hot cathode low-pressure mercury vapor discharge lamps such as fluorescent lamps, and in particular to improving the electrodes of high-output discharge lamps. and how it is connected to the lighting circuit.
It has improved lifespan.

[Conventional technology]

Conventionally, as one method for improving the electrodes of high-output discharge lamps, as described in Japanese Patent Publication No. 11816/1983,
It has been proposed to provide a sub-electrode with electron emissivity. However, the manufacturing method is difficult to make the sub-electrode emissive over a long period of time, and the electron emissivity of the sub-electrode decreases as the lighting time increases, and the lead wire to which the sub-electrode is electrically connected is not connected to the power supply side. However, the disadvantage was that the emitter held by the filament would rapidly wear out.

[Problem that the invention seeks to solve]

In the above conventional technology, the sub-pole has electron emissive properties to reduce the wear and tear of the emitter held by the filament, but the fact that the sub-pole bears most of the electron emission means that the emitter of the sub-pole also wears out. It should be early. Therefore,
For example, during the latter half of its life, the filament's emitter will bear most of the electron radiation. When the sub-pole no longer emits electrons in this way, problems may occur in starter-type circuits depending on how the pins are connected.

In other words, if the pin on the side to which the sub-electrode is connected is connected to the power supply side and the other pin is connected to the starter side, when it is an anode, most of the electrons will flow into the sub-electrode and flow to the power supply, so there will be no current in the filament. does not flow.

Therefore, when the filament is an anode, the emitter temperature of the filament is low. Next, in the cathode phase, since the sub-electrode does not have electron emitting properties, electrons are emitted from the emitter of the filament, but in the anode phase, the temperature of the emitter has decreased and the electron emission ability has deteriorated. To compensate for this, the ion bombardment of the emitter becomes stronger, and as a result, the wear of the emitter progresses at an accelerated rate. Therefore, it has a short lifespan.

In view of the above-mentioned problems, an object of the present invention is to flow the electrons flowing into the sub-electrode during the anode phase to the power source through the filament, to prevent the temperature drop of the emitter held by the filament by this current, and to prevent the temperature of the emitter held by the filament from decreasing in the next cathode phase. An object of the present invention is to provide a discharge lamp lighting device that can reduce ion bombardment and reduce the rate of wear of an emitter.

An auxiliary pole is placed on the discharge path side and electrically connected to one of the two lead wires that support the filament, and when connecting to the starter type lighting circuit, the lead wire connected to the auxiliary pole is This is achieved by connecting the lead wire to the starter circuit side and the other lead wire to the power supply circuit side.

[Effect]

With the configuration of the present invention, the following operation occurs during discharging. That is, in the anode phase, most of the electrons flow into the auxiliary electrode placed closer to the discharge path than the filament, and these electrons flow from the lead wire connected to the auxiliary electrode through the filament to the power supply circuit. Since the starter circuit is open during discharge, current always flows through the filament.

Therefore, when the emitter is an anode, the emitter held by the filament is not subjected to electron bombardment, but is heated by the current flowing through the tungsten filament, thereby preventing a drop in temperature. Next, when moving to the cathode phase, electrons are emitted from the emitter, but since the temperature is maintained as high as the previous anode phase, electron emission is good and ion bombardment is small. Therefore, the wear rate of the emitter can be slowed down and its lifespan can be extended.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 shows the method of connecting the lamp of the invention to a starter type circuit. A filament is suspended between lead wires 3 and 4, and an auxiliary pole 1 made of a Ni wire with a diameter of 0.8 m is connected to lead wire 3. To explain in more detail with reference to FIG. 2, a filament 2 is suspended between lead wires 3.4, and this filament HC holds an emitter (electron radioactive substance). The lead wires 3 and 4 are sealed with a stem 8 and connected to external leads. One of the two lead wires, lead wire 3, has a Ni diameter of 0.811III.
The auxiliary pole 1, whose wire is shaped as shown in FIG. 2, is spot welded. Most of the auxiliary electrode 1 is installed so as to be located closer to the discharge path than the filament.

The counter electrode also has a similar configuration. To connect this to a lighting circuit using a glow starter, as shown in Figure 1, auxiliary pole 1
Connect the lead wires 3 and 3' to the glow star tough side, and connect the other lead wire 4 and 4' to the AC power source 6 via the ballast 5. When the experiment was carried out using a ring-shaped 30 watt fluorescent lamp having such a structure, the following effects were obtained.

1) The wear rate of the emitter is slow, and the lifespan is about 25
% longer.

2) Since most of the electrons flow into the auxiliary electrode during anode operation, the anode vibration is stabilized, and light flickering near the electrode is almost eliminated until the end of its life.

3) Since the emitter receives almost no electron impact and ion impact is reduced, blackening of the tube wall due to sputtering of the electrode material is reduced. Previously, it started turning black after about 1000 hours, but it stopped appearing after about 3000 hours.

4) Since the emitter wears out slowly, the oxidation of mercury by oxygen in the emitter is reduced, and the decline in luminous flux due to oxidized mercury is also slowed down. In the case of the ring type 30W, the luminous flux attenuation decreased by approximately % after 2000h.

〔Effect of the invention〕

According to the present invention, the consumption rate of the emitter can be reduced and the lifespan can be extended, so when a high-output low-pressure mercury vapor discharge lamp is lit using a starter-type lighting circuit, shortening of the lifespan can be prevented. be able to. Moreover, since the circuit is inexpensive, its economical effect is large.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a lamp and a connection method according to the invention, and FIG. 2 is a sketch of the electrode portion of the lamp according to the invention. 1.1'...Auxiliary pole, 2,2'...Filament,
3゜4.3', 4'... Lead wire, 5... Stabilizer,
6... AC power supply, 7... glow starter, 8...
Stem, 9...Lamp.

Claims (1)

[Claims] 1. A low-pressure mercury vapor discharge lamp with electrodes sealed at both ends, in which one of two lead wires with a suspended filament is electrically connected to a metal auxiliary electrode installed on the discharge path side from the filament. A discharge lamp lighting device characterized in that, when connecting the above to a starter type lighting circuit, the lead wire connected to the auxiliary pole is connected to the starter circuit side, and the other end is connected to the power supply circuit side.