JPH02189854A - Rare gas discharge lamp - Google Patents

Abstract

PURPOSE:To prolong the positive column generated in a discharge lamp as long as possible and increase the light quantity by encapsulating rare gas such as xenon in a tube, thereby forming a rare gas discharge lamp equipped with internal electrodes at the two ends, and therein providing an aux. electrode of non-linear type on the tube wall. CONSTITUTION:An aux. electrode 21 meandering from one end to the other is fitted on the tube wall of a rare gas discharge lamp 20, which is equipped with internal electrodes 20a, 20b at the two ends. Not only provision of this type of aux. electrode 21 allows sink of the starting voltage, but also the discharge path in the tube is formed along the aux. electrode 21 to permit the generated positive column to meander within the tube. Accordingly the positive column generated will become longer, and the light quantity generated will increase.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a rare gas discharge lamp that is filled with a rare gas such as xenon and has at least one set of internal electrodes at both ends.

(Prior Art) As shown in FIG. 10, a lighting device for a rare gas discharge lamp includes, for example, a pair of switching transistors 3.4, a resonant capacitor 5, and an oscillation transformer 6 connected to a DC power source 1 via an inductance coil 2. A self-excited inverter circuit 7 is connected, and each internal electrode of the rare gas discharge lamp 10 is connected to the output terminal of the inverter circuit 7 via a capacitor 89.
a.

10b is connected. An auxiliary electrode 11 is attached to the tube wall of the discharge lamp 10, and one end of the auxiliary electrode 11 is connected to the other end of the output terminal of the inverter circuit 7 via a capacitor 12.

In this device, the high frequency voltage output from the inverter circuit 7 is applied between the internal electrodes 10a, 10b of the discharge lamp 10 and also applied to the auxiliary electrode 11, so that starting and lighting can be performed smoothly. The role of the auxiliary electrode 11 is to lower the starting voltage and stabilize the discharge path.

The auxiliary electrode 1 attached to the discharge lamp 10 in the past
1 was linear as shown in FIG.

(Problem to be solved by the invention) However, in the case of using a linear auxiliary electrode like this, the positive column generated inside the discharge lamp is approximately straight along the auxiliary electrode, so there is not enough light. There was a problem that I couldn't get it.

SUMMARY OF THE INVENTION The present invention aims to provide a rare gas discharge lamp that can increase the amount of light by maximizing the length of the positive column generated in the discharge lamp.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a rare gas discharge lamp in which a rare gas such as xenon is sealed in the tube and is provided with at least one set of internal electrodes at both ends. A non-linear auxiliary electrode is added to the auxiliary electrode.

(Function) In the present invention having such a configuration, since the shape of the auxiliary electrode is non-linear, the positive column generated inside the discharge lamp also has a non-linear shape along the auxiliary electrode, and the length of the positive column is increased. Become. Therefore, the area where the positive column is generated increases and the amount of light increases.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, internal electrodes 20a and 2 are provided at both ends, respectively.
An auxiliary electrode 21 meandering in a waveform from one end to the other end is attached to the tube wall of the rare gas discharge lamp 20 provided with the 0b. As the lighting device for this discharge lamp 20, the same device as shown in FIG. 10 may be used.

By attaching the auxiliary electrode 21 having a meandering waveform in this way, it is possible to reduce the starting voltage, of course, and since the discharge path formed inside the tube follows the auxiliary electrode 21, the generated positive column meanders inside the tube. It becomes like this. Therefore, the length of the generated positive light column increases accordingly, the amount of generated light increases, and it becomes brighter.

Particularly in discharge lamps with high gas pressure, the phosphor can only be excited near the auxiliary electrode, which has a remarkable effect.

Next, other embodiments of the present invention will be described with reference to the drawings.

In the embodiment shown in FIG. 2, a hook-shaped meandering auxiliary electrode 22 is attached to the tube wall of the discharge lamp 20, and this embodiment also provides the same effects as the previous embodiment.

The one shown in FIG. 3 is one in which a spiral-shaped auxiliary electrode 23 is attached to the discharge lamp 20 so as to be wrapped around the tube wall. This makes it possible to further increase the length of the sunlight column, making it possible to further increase the amount of light.

Moreover, the one shown in FIG. 4 has a meandering waveform, and the internal electrode 2
An auxiliary electrode 24 is attached to the discharge lamp 20, which has a dense meandering pitch in the vicinity of 0a and 20b and a coarse meandering density in the middle part of the discharge ablation. The length of the positive column is longer per unit lamp length, and the amount of light is greater than in the middle part where the pitch is coarse. The brightness distribution at the ends of the Zunawaji discharge lamp 20 is higher than the brightness distribution at the middle. In this way, the luminance distribution in the length direction of the discharge lamp can be changed.

In addition, the one shown in FIG. 5 has a translucent auxiliary electrode 25 meandering in a waveform attached to the tube wall of the discharge lamp 20. By doing this, the auxiliary electrode 25 part does not become a shadow. Light can also be emitted from the parts. Therefore, the amount of emitted light can be further increased.

Furthermore, the one shown in FIG. 6 is a flat rare gas discharge lamp 26 with an auxiliary electrode 27 attached in a meandering waveform. Since the luminance can be distributed approximately evenly, a discharge lamp with high luminance and uniform luminance distribution can be obtained.

Furthermore, the one shown in FIG. 7 is a flat rare gas discharge lamp 28 which is relatively wide and has two sets of internal electrodes 28a and 28b, 28c and 28d, and two auxiliary electrodes 29, 30 meandering in a waveform. By doing so, the curvature of the waveform of the auxiliary electrode can be made smaller than when one auxiliary electrode is provided, and a positive column can be stably generated along the auxiliary electrode. can be done. In addition,
This embodiment also provides the same effects as the embodiment shown in FIG.

Furthermore, in the lamp shown in FIG. 8, a wave-shaped auxiliary electrode 21 is attached to the rare gas discharge lamp 20 as a first auxiliary electrode, and a linear second auxiliary electrode is attached to the rare gas discharge lamp 20 through an insulating layer. An electrode 30 is attached. That is, as shown in a partial cross-sectional view in FIG.
A second auxiliary electrode 31 is placed on the second side with an insulating layer 32 interposed therebetween. Note that the second auxiliary electrode 31 may be directly laminated on the first auxiliary electrode 21 without using the insulating layer 32 with sufficiently high impedance.

The voltage from the inverter circuit is not applied to the second auxiliary electrode 31.

In this way, the positive pillar generated inside or the first 411
auxiliary electrode 2] side. It goes without saying that this embodiment also provides the same effects as those of the previous embodiment.

[Effects of the Invention] As described in detail below, the present invention provides a rare gas discharge lamp in which the length of the positive column generated in the discharge lamp is made as long as possible, thereby increasing the amount of light. It is possible.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing one embodiment of the present invention, Figs. 2 to 8 are block diagrams showing other embodiments of the present invention, and Fig. 9 is a block diagram showing an embodiment of the present invention.
10 is a circuit diagram showing an example of a discharge lamp lighting device, and FIG. 11 is a configuration diagram showing a conventional example. 20.26.28...Rare gas discharge lamp 2], 22,23,24,25,27.29...Auxiliary electrode applicant agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] A rare gas discharge lamp having a rare gas such as xenon sealed in the tube and having at least one set of internal electrodes at both ends, characterized in that a non-linear auxiliary electrode is attached to the tube wall of the tube. gas discharge lamp.