JPS5826447A - High pressure discharge lamp - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high pressure discharge lamp that is operated by a commercial power supply of 100 to 120 volts.

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, such a small high-pressure discharge lamp is ``100V or 110V, which is used in general households, stores, hotels, etc.''! , or 1
Starts with 20■ commercial power supply.

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

The applicant previously proposed a compact high-pressure sodium lamp with high color rendering properties that has almost the same violet color and color rendering properties as incandescent light bulbs, and has a lamp efficiency of over 401 m/W at a rated lamp power of 20 to 100 W. There are two. This high color rendering property, high E
E-sodium lamps are designed with an effective lamp voltage of around 50V, but once the lamp starts, the voltage is 100V AC or 11OV'! It can be continued to be lit directly using an inductance ballast using a 120V or 120V commercial power source.

However, the following problems remain regarding starting such small high-pressure sodium lamps.

In other words, if a low-pressure neon and argon mixture gas is sealed in the arc tube with low-voltage starting, even if a starting aid is installed around the outer circumference of the arc tube, the above-mentioned There was a problem in that the rung could not be reliably started directly with the voltage of the commercial power supply.

The present invention provides a high-pressure discharge lamp that is operated by a commercial power source of 100 to 120 V and can be started easily and accurately.

The inventors conducted a preliminary examination of the starting method and continued.
Uses a high-pressure trichum lamp with high color rendering properties.

Experiments and studies were conducted on the relationship between the arc tube's assassin noble gas and lamp starting characteristics.

Hereinafter, the present invention will be explained using the drawings.

FIG. 1 is a longitudinal cross-sectional view of an arc tube of an SOW high-color rendering high-pressure sodium lamp manufactured using an alumina arc tube and used in an experiment, which is an embodiment of the present invention. In the same figure,
1-. An arc tube made of alumina and having an inner diameter of 4 mn, with niobium tubes 2 and 3 hermetically sealed at both ends as electrode conductors. An electrode 4 is placed at the tip of the niobium tube 2.3.
, 5 is the protection mrn. Inside the arc tube 1, a sodium-mercury amalgam with a sodium molar ratio of 78% is filled with argon gas as a starting gas. This sealing pressure and [7 and 10 'rorr eoo'ro
A lamp with several stages between rr was used in the experiment. Thermal protection films 7 and 8 made of tantalum are provided around the outer periphery of both ends of the arc tube 1 to prevent heat and light radiated from the inside of the arc tube 1, particularly from the electrodes 4.5, during rung operation. It is confined in the coldest point of the arc tube formed behind the electrode and serves to raise the temperature of this coldest point. When performing various experiments including the starting characteristics of the high-pressure sodium lamp in this example, the lamp voltage was set at 47 V and the rung power was set at 5 V.
Heat protection tlQ 7 so that the color temperature is 2300 or more and the average color rendering index R& is 75 or more under a constant 0W.

The length in the longitudinal direction of the arc tube 1 of 8 is adjusted in advance.

Now, we conducted a preliminary examination from a comprehensive standpoint on the start-up method of the uncut wrap for the high-color-rendering, high-pressure L-11 umlumb in which the arc tube 1 shown in Fig. 1 is incorporated into the outer tube (not shown). . The following two methods, which are well-known methods, can be considered to enable starting of all the rungs used in the experiment. One of these is a starter consisting of a bimetallic switch and its heater, which are commonly used as starters for high-efficiency, high-pressure sodium lamps.
This is a method in which it is incorporated into the outer tube. The other is
This method incorporates a high-voltage pulse oscillator, known as an igniter, into the lamp ballast. According to both of these formulas, high voltage pulses of up to 3 kV can be emitted, so
All 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 built into the outer lamp tube, so the lamp external size becomes large, and in the second method, the ballast is large-scale.
We focused on a valuable solid-state (semiconductor) lighting element that can be used without significantly detracting from the advantage of this compact high-pressure discharge lamp, which is that it can be easily lit using a commercial power source such as 0V.

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

In this experiment, a current limiting resistor 24 was inserted to control the cutoff current of the lighting tube 21. However, 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, the arc tube 1 may start depending on the pressure of the argon gas sealed in the arc tube 1. In some cases, it was necessary to install auxiliary conductors. Note that the experiment was conducted by applying a 100 AC power source 25 to the lamp.

The reason why the lamp was able to start reliably and achieve stable lamp lighting, even when the above-mentioned auxiliary measures were taken, was due to the following:
The sealing pressure of argon gas is from 60'I'orr to 300
It was up to TOrr. If the injection pressure of the argon gas sealed in the arc tube 1 is less than 60 Tc)rr K, a spark discharge will occur once but a sustained discharge will not occur, and especially when the lighting tube 21 is used, a glow discharge will occur. As the operation was repeated, 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. - If the argon gas injection pressure exceeds 300 Torr, arc discharge will be induced in the arc tube 1, but at this moment the lamp voltage will exceed the minimum operating voltage of the lighting tube 21. The lighting tube 21 restarted, but as a result, the arc discharge induced in the arc tube 1 was extinguished, and in the end, the lamp could not be started.

In the above explanation, we have shown the case where the distance d (cm) between the electrodes 4 and 6 of one arc tube 1 is 10,000 mm, that is, 1,000 cm, but even in other cases, the sealing pressure of argon gas can be p (TOrr) (!: When p
, d in the range of 60 to 300 Torr-m, the lamp was reliably started and lit by the lighting tube 21, and no malfunction of the lighting tube 21 occurred.

Furthermore, using an arc tube with the same distance between the electrodes as above or 10.0 m, and using 5 cryptocytogas and xenon gas instead of argon gas as the starting rare gas sealed in it, -1- When we conducted an experiment according to :j: It was necessary to set it in the range of 4o to 400 TOrr. Furthermore, as a result of experiments using arc tubes with different distances between electrodes, it was found that when p-d or krypton gas was used, it was 50 to 300 Torr, CIrL,
40 to 400 TOrr when using xenon gas
, cln, the lamp was reliably started by the lighting tube 2 lighting 17, and no malfunction of the lighting tube occurred.

In addition to the above experiments, we investigated the lamp life characteristics and lamp efficiency and found that within the p-d range, especially when alcon gas is used as the starting rare gas,
-1 for 250 TOrr, cTL, krypton gas
In particular, in the case of 70 to 270 Torr, cTL, and xenon gas, it has been found that the range of 60 to 350 Torr-1 is particularly excellent.

The present invention is as follows:1. It can be applied not only to high-pressure thorium lamps with high color rendering properties, but also to high-pressure discharge lamps in general, including general high-pressure thorium lamps.

As explained above, the unexploded F3A is an arc tube that is filled with a rare starting gas and has electrodes on both ends.
And in a high-pressure discharge lamp equipped with a lighting precious or solid-state lighting element for applying a starting voltage to the arc tube, the filling pressure of the starting rare gas is p (Torr), and 6
f When the distance between the electrodes is 6 (CIn), the product of the sealing pressure and the distance between the electrodes is p, d(Torr-(J
), 6 if the starting rare gas in item 10 is argon gas.
0 to 300 (TOrr-crn), 5o to 30o (TOrr, cIrL) in the case of krypton gas, and 40 to 400 (TOrr, cIn) in the case of xenon gas, so that 100 to 120V commercial 10. To provide a high pressure discharge lamp that can be easily and reliably started using a power source.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an arc tube used in an embodiment of the high-pressure discharge lamp according to the present invention, and FIG. 2 is a lighting circuit diagram of an embodiment of the high-pressure discharge lamp according to the present invention. . 1... Arc tube, 2, 3... Niobium tube, 4, 6...
... Electrode, 6 ... Storium-mercury amalgam, 7.8 ... No protective film, 21 ... Lighting tube, 2
2...Single choke ballast, 23...
・High-speed thorium lamp, 24...Current limiting resistor,
26...Power supply.

Claims (1)

[Claims] An arc tube containing a starting rare gas and provided with electrodes at both ends, and a solid-state lighting element for applying a starting voltage to the arc tube. with vt
I Start The rare gas input pressure for starting is p (Torr), and O
When II is the distance between the electrodes (Cm), if I is the sealing pressure and ifff is the product of the inter-electrode distance p-d (Torr
-cln), ii.60~soo (Torr-C
m), in the case of krypton gas, so ~ 300 (To
rr, CrIL). In the case of xenon gas, 40 to 4Q○ (Torr-cr
A high-pressure discharge lamp characterized in that the lamp is in the range of n).