JPS5826448A - High pressure discharge lamp device - Google Patents

Abstract

PURPOSE:To enable the captioned device to be started easily and securely, by setting the product of the sealing pressure of starting rare gas and the distance between electrodes to a specified range of value in the captioned device where the high pressure discharge lamp which can be lighted by a commercial source of 100-120V is started by a glow-starter or a solid lighting element. CONSTITUTION:In a high pressure discharge lamp, wherein a glow-starter 21 and a single choke stabilizer 22 are used to incorporate a luminous tube 1 into an outer tube 23, starting rare gas is sealed inside said lamp, and the luminous tube equipped with electrodes is installed at the both ends; when the sealing pressure of said starting rare gas is p (Torr), and the distance between electrodes is d (cm), the product of said sealing pressure and said distance between electordes will be 60-300 (Torr.cm), if the starting rare gas is argon, 50-300 (Torr.cm) in case of krypton gas and 40-400 (Torr.) in case of xenon gas so that the high pressure discharge lamp can be started easily and securely by the use of a glow-starter or the solid lighting element.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-pressure discharge lamp device in which a high-pressure discharge lamp is operated by a commercial power supply of 100 to 120 V and is started by a lighting device or a solid-state lighting element.

As we enter an era of energy conservation, the development of high-intensity, high-efficiency, compact high-pressure discharge lamps to replace incandescent light bulbs, fluorescent lamps, and even fluorescent lamps is gaining momentum. By the way, these small high-pressure discharge lamps can be started with a 100V, 110V, or 120V commercial power source, which is used in general households, stores, hotels, etc.

If it can be turned on, it is expected that it will become popular quickly.

The applicant previously developed a compact, high-color-rendering, high-pressure sodium lamp that has almost the same light color and color rendering properties as an incandescent lamp, and has a lamp efficiency of over 401 m/W at a rated lamp power of 20 to 100 W. is suggesting. This high color rendering high pressure sodium lamp is designed with an effective lamp voltage of around 50V, so once the lamp starts,
It is possible to continue lighting directly with an inductance ballast using a commercial power supply of 00V, 110Vj or 120V.

However, the following problems remain regarding starting such a small high-pressure thorium lamp.

In other words, even if a low-pressure mixture of neon and argon is filled in the arc tube with the aim of low-voltage starting, and in some cases a starting aid is provided around the outer circumference of the arc tube,
The problem is that the lamp cannot be reliably started directly with the voltage of the commercial power supply mentioned above.

The present invention provides a high-pressure discharge lamp device that can be easily and reliably started using a commercial power supply of 100 to 12 C1.

The inventors conducted a preliminary study on the starting method and continued to
Using a high-pressure sodium lamp with high color rendering properties, we conducted experiments and studies on the relationship between the rare gas sealed in the arc tube and the lamp starting and lighting characteristics.

” The present invention will be described below with reference to the drawings.

FIG. 1 shows an example of the present invention, which is a 50W high color rendering high-pressure tube manufactured using an alumina arc tube and subjected to an experiment.
It is a longitudinal cross-sectional view of the arc tube of the IJum lamp. In the figure, reference numeral 1 denotes an arc tube made of alumina and having an inner diameter of 4.jmm, with niobium tubes 2 and 3 as electrode conductors at both ends.
is hermetically sealed.

Electrodes 4 and 5 are held at the tips of the niobium tubes 2 and 3, and the shortest distance d between these electrodes is 10. ○mm sharp. Inside the arc tube 1, a sodium-mercury amalgam 6 having a 78% tomolar molar ratio and argon gas as a starting gas are sealed.

A lamp was used in an experiment in which the sealing pressure was varied in several stages from 10 Tprr to 60 Q Torr. Incidentally, heat preservation films 7 and 8 made of tantalum are provided on the outer periphery of both ends of the arc tube 10, and the arc tube 1 is protected during lamp operation.
The heat and light radiated from the interior of the arc tube, particularly the electrodes 4 and 6, are confined in the coldest point of the arc tube formed behind the electrodes, thereby increasing the temperature of this coldest point. When performing various experiments including the starting characteristics of the high-pressure Triuno lamp in this example, the lamp voltage was 47v1 and the lamp power was 50v.
■ Adjust the length of the thermal protection film 7°80 in the longitudinal direction of the arc tube 1 in advance so that when the color temperature reaches 2300, the semiuniform color rendering index Ra becomes 75 or higher. be.

Now, for a high-pressure thorium lamp with high color rendering properties, the arc tube 1 shown in FIG. 1 is incorporated into an outer tube (as shown in FIG.
First, we conducted a preliminary study of the starting method for the lamp from a comprehensive perspective.

The following two methods, which are well-known methods, can be considered as methods for starting all the lamps used in the experiment. One method is to incorporate a starter consisting of a bimetallic switch and its heater, which is already commonly used as a starter for high-efficiency high-pressure sodium lamps, into the outer bulb together with the arc tube 1. The other method is to incorporate a high-voltage pulse oscillator, known as an igniter, into the lamp ballast. According to both of these formulas, up to 3
Since it can emit a kVO high 1 Mobalus, all the lamps used in the experiment started. However, both of these types have drawbacks that greatly detract from the advantages of this compact high-pressure discharge lamp. That is, in the first method, the starter is integrated into the lamp outer tube, which increases the size of the lamp.
All of these lamps take advantage of the advantage of this compact high-pressure discharge lamp, which is that it can be easily lit using commercial power sources such as 100V, 110V, and 120V. Therefore, the inventors focused on a valuable lighting element or a solid state (semiconductor) lighting element that can be used with a commercial power source.

Figure 2 shows the lighting tube 21 and single choke ballast 22.
1 is an electrical circuit diagram of a 50 W high color rendering high pressure sodium lamp in which the arc tube 1 is assembled and twisted in the outer bulb 23, and a lamp starting experiment was conducted using the same.

In this experiment, a lighting tube 21 was connected in parallel with the high-pressure sodium lamp, and a current limiting resistor 24 was connected in series with the lighting tube 21 to control the interruption current. Since there is a limit to the pulse voltage induced in the inductance of the single choke ballast 22 when the lighting tube 21 is shut off, depending on the pressure of the argon gas sealed in the arc tube 1, a starting auxiliary conductor may be installed in the arc tube 1. In some cases, it was necessary to add. In addition, the experiment was conducted using AC 100V power supply 2.
5 was applied to the lamp.

The pump was able to start reliably and the lamp was lit stably even when auxiliary measures were taken, including when the argon gas filling pressure ranged from 60 Torr to 300 Torr.
It was in Torri. If the pressure of the argon gas sealed in the arc tube 1 is less than 6 Q Torr, a spark discharge will occur once, but a sustained discharge will not occur, and especially when the lighting tube 21 is used, a tallow discharge will be repeated. At the same time, the lighting tube 21 merely blinked repeatedly, and arc discharge was not induced in the arc tube 1, so that the lamp could not be started. On the other hand, if the argon gas filling pressure exceeds 30 QTorr, arc discharge is induced in the arc tube 1, but at this moment the lamp voltage exceeds the minimum operating voltage of the lighting tube 21, and the lighting tube 21 Re-operation (
As a result, the arc discharge induced in the arc tube 1 disappeared, and in the end, the lamp could not be started.

” - In the explanation, the voltage of arc tube 1 is 1'M4+6 (
j distance d (cm) is 10.0 mm or 1.0
0cm, but even in other cases, when p-d is in the range of 60 to 300 Torrecm, the lamp can be operated reliably by the lighting tube 21. It started and turned on immediately, and no malfunction of the lighting tube 21 occurred.

Furthermore, using an arc tube with the same interelectrode distance of 10.0 mm as above, and using krypton gas and xenon gas instead of argon gas as the starting rare gas sealed in the arc tube, according to the procedure described in -1-. When we conducted an experiment, we found that for the same reason that we limited the upper and lower limits of the sealing pressure of archon gas to - in the above, it was 50 to 300'rorr when krypton gas was used, and 50 to 300'rorr when xenon gas was used. had to be in the range of 40 to 400 Torr.

Furthermore, as a result of experiments using arc tubes with different distances between the electrodes, the p-d was 50 to 300 Torr-cm when using krypton gas, and 40 to 400 Torr-cm when using xenon gas. cm range, the lamp was reliably started and lit by the starter tube, and no malfunctions of the starter tube occurred.

In addition to the above experiment, we investigated the lamp life characteristics and lamp efficiency and found that within the p-d range, especially when argon gas is used as the starting rare gas, it is 80 to 2.
It has been found that a range of 50 Torr-cm, 70 to 270 Torr-cm in the case of krypton gas, and 60 to 350 Torr-cm in the case of xenon gas is particularly excellent.

It is needless to say that the present invention is applicable not only to the above-mentioned high-pressure sodium lamp with high color rendering properties, but also to high-pressure discharge lamps in general, including general high-pressure lamps.

As explained above, the present invention is a high-pressure discharge lamp equipped with an arc tube in which a starting rare gas is filled and electrodes are provided at both ends, and the charging pressure of the starting rare gas is set to p. (Torr), and the distance between the electrodes is a
(cm), the product p-d (Torr-cm) of the sealing pressure and the distance between the electrodes is 60 to 300 (Torr-c) when the starting rare gas is argon gas.
m), 50-300 (T
orr-cm), 4o to 400 for xenon gas
(Torr-cm), it is possible to provide a high-pressure discharge lamp that is easy to start and that can be started reliably by using a high-pressure discharge lamp that is lit or solid-state.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an arc tube used in a high-pressure discharge lamp device which is an embodiment of the present invention, and FIG. 2 is a lighting circuit diagram of the high-pressure discharge lamp device which is an embodiment of the present invention. 1... Arc tube, 2, 3... Niobium tube, 4, 5...
... Electrode, 6 ... Sodium-mercury amalgam, 7゜8 ... Heat protection film, 21 ... Lighting tube, 2
2... Lamp Luna yoke ballast, 23... High pressure sodium lamp, 24... Current limiting resistor, 26...
··power supply.

Claims (1)

[Scope of Claims] The arc tube is equipped with an arc tube in which a starting rare gas is sealed and electrodes are provided at both ends, the charging pressure of the starting rare gas is p (Torr), and the pressure between the electrodes is set to p (Torr). distance d
(cm), the product p-d (Torr-cm) of the sealing pressure and the distance between the electrodes is 60 to 300 (Torr-c) when the starting rare gas is argon gas.
m) 50 to 300 (Tor) for krypton gas
r-cm) 40 to 400 (
1. A high-pressure discharge lamp device, characterized in that the high-pressure discharge lamp in the range (Torr-cm) is started by a lighting device or a solid-state lighting element.