JPH10144257A - Rare gas discharge lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lower the lamp current, and to raise the lamp voltage so as to miniaturize a lighting power source, and to improve the light emitting efficiency by filling hydrogen gas or deuterium gas other than rare gas at the predetermined ratio. SOLUTION: Hydrogen gas or deuterium gas at 1×10<-3> -0.5, 5×10<-3> -0.3 of molar ratio in relation to the rare gas such as argon, krypton and xenon inside a light emitting tube, which is made of translucent ceramics or the like, is filled. Light emitting efficiency is improved by non-elastic collision of hydrogen in plasma with electron, low electrical conductivity of hydrogen and high thermal conductivity. Since the lamp voltage is raised by hydrogen gas, lighting at a small lamp current is made possible, and capacity of a ballast is reduced, and a power source can be miniaturized. Helium gas at 1×10<-2> -0.2 of mole ratio in relation to the rare gas can be filled, and a light emitting tube of silica glass having the double-tube structure can be used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rare gas discharge lamp.

[0002]

2. Description of the Related Art In a rare gas discharge lamp in which a rare gas such as xenon (Xe), argon (Ar), or krypton (Kr) is sealed in an arc tube, hydrogen gas is conventionally treated as an impure gas. Have been. The reason for this is
Regarding the electron energy in the lamp, the collision cross section where electrons collide with hydrogen is larger than the collision cross section of the rare gas, so that energy is consumed for other than the rare gas that emits light. It is said that the presence of hydrogen acts as a loss with respect to the injected energy.

[0003] Of the rare gas discharge lamps, for example, a xenon discharge lamp has an emission spectrum close to natural light, and is therefore widely used for various purposes. Specifically, a search light for ships consumes about 150 W of power. Is used. When used for ships, F emitted from the lamp
M-band electromagnetic waves (hereinafter, FM noise) must be avoided because they interfere with wireless communication. In order to remedy the inconvenience, in a previous study, in addition to Xe, a trace amount of hydrogen gas, specifically, 5 × 10 ^{−4 in} terms of the encapsulation molar ratio to Xe.
It has been found that by introducing the above-described hydrogen gas into the arc tube, the critical current value for generating FM noise is reduced, and the occurrence of FM noise is substantially prevented during steady-state lighting. Also,
There is also obtained a characteristic that the stability of the arc is improved by mixing hydrogen gas at a filling molar ratio of 5 × 10 ⁻⁴ or more with respect to Xe (Japanese Patent Application Laid-Open No. 4-306552).

On the other hand, regarding another effect of hydrogenation on a xenon lamp, Wolfgang is different from the above document.
E. FIG. Thouret and Herbert S.M. Stra
uss study (Wolfang E. Thouret)
and Herbert S.A. Strauss, "Xe
non Compact Arcs with inc
derived brightness through
addition of hydro @ ogen ", III
uminating Engineering (May
1963 P371-379)). According to the document, an experiment was performed using a short arc lamp in which Xe was added with hydrogen, and as a result, the arc axis near the anode was obtained under the conditions of hydrogen addition (concentration of 2-3% and concentration of around 30%). The above shows that although the luminous intensity increases, the luminance of the cathode luminescent spot decreases and the lamp luminous efficiency decreases.

[0005]

In the conventional rare gas discharge lamp, the improvement of preventing the generation of FM noise and improving the arc stability has been shown by filling a small amount of hydrogen gas as shown in the example of Xe. When the amount of hydrogen charged is relatively large, ie, about 2 to 3% or about 30%, lamp characteristics such as a decrease in luminous efficiency are shown. A rare gas discharge lamp represented by a xenon lamp has a higher lamp current and a higher lamp voltage when compared to other discharge lamps having the same level of power consumption, for example, a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, and a metal halide lamp. Was low. Therefore, the lighting power supply has a drawback that the power consumption is larger than other discharge lamps of the same level. Further, the luminous efficiency of the conventional rare gas discharge lamp is lower than the typical luminous efficiency of metal halide lamp, which is generally 60 to 80 (lm / W), and is 20 to 30 (lm / W).
/ W).

Accordingly, the present invention provides a lighting power supply in which a rare gas discharge lamp has a lower lamp current and a higher lamp voltage than other types of discharge lamps when compared at the same power consumption. It is an object of the present invention to provide a lamp that is reduced in size and has a luminous efficiency improved by 10% or more compared to a conventional rare gas discharge lamp.

[0007]

Means for Solving the Problems As a result of intensive investigation and research, the present inventor has found that hydrogen gas or deuterium gas can be used in various rare gas discharge lamps in order to achieve the objectives of improving the luminous efficiency and miniaturizing the power supply. Alternatively, it has been found that it is effective to enclose a predetermined amount of He gas in the arc tube in addition to the rare gas.

That is, according to the first aspect of the present invention, in the rare gas discharge lamp in which the argon gas (Ar) is sealed in the arc tube, the mole ratio of Ar to Ar is 1 × 10 ⁻³ or more.
The above problem is solved by forming a rare gas discharge lamp in which hydrogen gas or deuterium gas of 0.5 or less is sealed in the arc tube.

According to the second aspect of the present invention, krypton gas (Kr) is sealed in the arc tube, and a hydrogen gas or a heavy gas having an amount of 5 × 10 ⁻³ or more and 0.3 or less in a molar ratio of Kr to Kr. The above problem is also solved by a rare gas discharge lamp in which hydrogen gas is sealed in the arc tube.

Similarly, according to the third aspect of the present invention, xenon gas (Xe) is sealed in the arc tube, and a hydrogen gas in an amount of 1 × 10 ⁻² or more and 0.2 or less in a mole ratio of Xe to Xe. Alternatively, a rare gas discharge lamp in which deuterium gas is sealed in the arc tube may be used.

Further, according to the invention of claim 4, xenon gas (Xe) is sealed in the arc tube, and hydrogen gas or heavy gas in an amount of 5.times.10.sup.- ² or more and 0.09 or less in terms of the mole ratio of Xe to Xe. If a rare gas discharge lamp in which hydrogen gas is sealed in the arc tube is more effective.

According to the fifth aspect of the present invention, in a rare gas discharge lamp in which at least one of Ar, Kr, and Xe is sealed in an arc tube, a mole ratio of the rare gas to the rare gas is 1 × 10 ^−. A rare gas discharge lamp in which helium (He) in an amount of ² or more and 0.2 or less may be sealed in the arc tube.

Further, according to the invention of claim 6, the rare gas discharge lamp according to any one of claims 1 to 5, wherein the arc tube is made of translucent ceramics.

According to the invention of claim 7, the arc tube is made of silica glass, and the arc tube is filled in a second hermetic container filled with hydrogen gas or a mixed gas of deuterium gas and rare gas. And a rare gas discharge lamp according to any one of claims 1 to 5 having a double tube structure.

According to the invention of claim 8, the rare gas (Ar, Kr, X
e) In order to realize a mixed gas state of hydrogen gas or deuterium gas only during lamp operation, hydrogen gas is previously absorbed by a hydrogen storage metal or a hydrogen storage alloy, and the hydrogen storage metal or the hydrogen storage metal is mixed with a rare gas. A rare gas discharge lamp in which the alloy is sealed in an arc tube may be used.

Further, according to the ninth aspect of the present invention, a pair of electrodes are disposed opposite to each other in an arc tube having a sealing portion at both ends, and the sealing portion is formed of a non-conductive powder of the same material as the arc tube and a conductive material. The functional powder according to claim 6, wherein the functional powder is mixed with the functional powder continuously or stepwise in the length direction at a different ratio and molded to form a functionally graded material having one end non-conductive and the other end conductive. A rare gas discharge lamp may be used.

According to the tenth aspect of the present invention, in the rare gas discharge lamp using metal niobium (Nb) for the electrode core of the ceramic arc tube, the Nb electrode core exposed to the discharge space is covered with molybdenum. The rare gas discharge lamp described in 6 may be used.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings. FIG. 9 is a schematic view of an electrode type short arc type rare gas discharge lamp according to the present invention. The arc tube 1 is made of silica glass. The arc tube 1 has sealing portions 2 at both ends, and a pair of electrodes 3 and 4 are arranged inside the arc tube. 5 is a base and 9 is a tip tube part. The arc tube 1 is filled with a predetermined amount of a single gas of Ar, Kr, or Xe or a mixed gas of a plurality thereof, and a small amount of hydrogen gas is sealed together with the rare gas.

Only Ar is used as a rare gas at room temperature at 26 at.
m, 16 atm, 7 atm sealed discharge lamps are manufactured one by one as reference lamps.
A plurality of discharge lamps each containing hydrogen gas were prepared by changing the hydrogen gas charging molar ratio of Ar to hydrogen in various ways, and the emission intensity was measured in a wavelength range of 200 to 800 nm.
FIG. 2 shows a value obtained by dividing the integrated value of the luminous intensity by the lamp power, that is, the luminous efficiency with respect to the charged molar ratio of hydrogen gas. In FIG. 2, the hydrogen concentration is 0 and the Ar sealing pressure is 2
The data is organized assuming that the luminous efficiency at 6 atm is 1.

Referring to FIG. 2, the luminous efficiency increases when the molar ratio of hydrogen gas to Ar is 7.5 × 10 ^−2.
It can be seen that the luminous efficiency is twice or more as compared with the case where only is sealed.

However, when a larger amount of hydrogen gas is filled, the luminous efficiency gradually decreases, and when the filling molar ratio exceeds 0.6, it becomes almost equal to the case where only Ar is filled. FIG. 2 also shows that the increasing behavior of the luminous efficiency when hydrogen gas is sealed at the same time as the rare gas (Ar) is the same even when the sealing gas pressure is changed. The above-mentioned equivalent means that the rate of increase in luminous efficiency is the same even if the pressure changes. FIG. 3 is an enlarged view showing a luminous efficiency increase rate near 10%. In order to improve the efficiency by 10% over the rare gas discharge lamp in which only Ar is sealed, 26 at
Although a 10% line was drawn using m as an example, it can be seen that the charged molar ratio of hydrogen gas of Ar to Ar must be 1 × 10 ⁻³ or more and 0.5 or less. In the above example, pure Ar was used as the rare gas. However, the same effect as described above can be expected when a small amount of other rare gas such as Kr or Xe is sealed together with Ar in addition to Ar. .

FIG. 4 shows an experiment similar to that of FIG. 2 in which Kr is used as the sealed rare gas instead of Ar. From FIG.
As in the case of Ar, the emission intensity increases when the molar ratio of charged hydrogen gas to the Kr ratio is up to 7.5 × 10 ⁻² ,
When the charged molar ratio of hydrogen gas exceeds 0.4, it is almost equal to the case where only Kr is charged. FIG. 5 is an enlarged view showing a luminous efficiency increase rate in the vicinity of 10%. In order to improve the efficiency by 10% compared to a rare gas discharge lamp in which only Kr is sealed, the filling molar ratio of hydrogen gas to Kr is 5 × 10 ^-3 or more 0.3
It turns out that it is necessary to be: Although an experiment was conducted with pure Kr as a rare gas, the same effect as described above can be expected when a small amount of another rare gas such as Ar or Xe is sealed together with Kr in addition to Kr.

FIG. 6 shows an experiment similar to that of FIG. 2 in which Xe is used as the sealed rare gas instead of Ar. From FIG. 6,
As in the case of Ar, the emission intensity increases until the molar ratio of charged hydrogen gas to Xe ratio is 7.5 × 10 ⁻² , and then the emitted light intensity decreases as the amount of charged hydrogen gas increases, and the hydrogen gas decreases. Is greater than 0.2, it is almost equal to the case of only Xe. FIG. 7 is an enlarged view showing a luminous efficiency increase rate of about 10%. In order to improve the efficiency by 10% compared to a rare gas discharge lamp containing only Xe, the charged molar ratio of hydrogen gas to Xe must be as follows. It is understood that it is necessary to be 1 × 10 ⁻² or more and 0.2 or less. Here, although an experiment was conducted using pure Xe as a rare gas, the same effect as described above can be expected when a small amount of another rare gas such as Ar or Kr is sealed together with Xe in addition to Xe.

Further, when the filling molar ratio of hydrogen gas to Xe is 5 × 10 ⁻² or more and 0.09 or less, efficiency is further improved, and surprisingly 100% or more. Experiments were carried out with various rare gases at a sealed pressure of 2 atm or more. Electrodeless lamps such as microwave discharge as shown in FIG. 11 show good aging characteristics, but short arc discharge as shown in FIG. In an electrode lamp, the electrode is severely damaged after lighting within 5 hours at a pressure of 5 atm or less, and is not suitable as a light source for a specially designed optical system. Further, in the present invention, the upper limit of the pressure in the arc tube was determined according to the following equation (Equation 1), and an experiment was performed.

[0025]

P = 2σ (r ₂ −r ₁ ) ² × (r ₂ + r ₁ ) /
(R ₂ ² + r ₁ ² ) × r ₁

Here, P is the operating pressure of the lamp, σ is the tensile strength of the material forming the arc tube, for example, 48 MPa in the case of silica glass, r ₁ is the inner radius of the maximum portion inside the arc tube, r ₂ Is the outer radius of the largest part of the arc tube. It was found that within the upper limit of the pressure, the luminous efficiency was higher as the pressure was higher.

FIG. 8 shows the effects on the luminous efficiency when Xe, Kr, and Ar and hydrogen gas are mixed and sealed. That is, the discharge of only rare gas from 200 to
10 times higher than the luminous efficiency of the integrated intensity of the 800 nm wavelength light.
%, 50%, and 100% increase in the molar ratio of mixed hydrogen gas, the rare gas which appears in the widest concentration range in which the effect on the luminous efficiency by mixing the hydrogen gas appears is Ar, and the rare gas of Kr and Xe is It narrowed in order.

There are several possible mechanisms for increasing the luminous efficiency by adding hydrogen. Since collision between hydrogen and electrons in plasma is less elastic than a rare gas such as Xe, electrons lose much of the energy they have in collision with hydrogen, which is a diatomic molecule. Hydrogen has an excitation energy level of Xe
, Which has little effect on the spectrum because it does not appear in the plasma excitation or ionization process.

Furthermore, the electric conductivity of hydrogen is lower than that of Xe, and when present in a mixed state, the electric conductivity of Xe arc plasma is lowered. Hydrogen is a gas with high thermal conductivity.On the other hand, it removes heat from the arc and lowers the efficiency, giving heat to the surrounding gas.On the other hand, hydrogen molecules dissociated by the arc cause hydrogen molecules near the relatively low temperature arc. Recombines and emits 4.52 eV of energy per molecule. As a result, the arc is narrowed, which is considered to increase the high-luminance portion.

Further, the inventors are also studying the use of He as a rare gas, and He is used to fill at least one rare gas of Xe, Kr, and Ar into a lamp. It has been found that the efficiency of the rare gas discharge lamp is increased by 10% or more by enclosing at a ratio of 0.01 to 0.2. In addition, as shown in FIGS. 2 to 7, each of the rare gases has a similar tendency as already shown in FIGS.
Efficiency improvement was confirmed at least in the He gas filling ratio of Xe to Xe discharge lamp of 1 × 10 ^{−2 to} 0.2. Since He also has a high ionization potential and a high thermal conductivity, similar to hydrogen, it is considered that the same effect as that of hydrogen has appeared.

In a rare gas discharge lamp, when hydrogen gas is present in the rare gas, the lamp voltage increases. The increase in the lamp voltage is increased by 30% when the molar ratio of the hydrogen gas to the rare gas is set to 2.5 × 10 ⁻² compared to the discharge when only the rare gas is sealed. Lighting can be reduced by 30%. That is, the capacity of the ballast is reduced, and the power supply for the rare gas lamp can be reduced in size.

Although the object of the present invention can be solved as described above, an experiment was conducted to confirm whether adding a hydrogen gas to a rare gas discharge lamp would change the color temperature and cause problems in actual use. Xe alone as a rare gas at room temperature (25 in this application)
(±± 5 ° C) 26atm sealed, power consumption is 150
A short arc discharge lamp having a W electrode was prepared as a reference lamp. Then, as an example of a specific lamp of the present invention, the specifications other than the sealing gas such as the lamp shape and power consumption are the same as those of the above-mentioned reference lamp, and the molar ratio of hydrogen gas to Xe is 2.5 × 10 ⁻² . A lamp filled with hydrogen gas at a ratio (Lamp 1) and a lamp filled with hydrogen gas at a ratio of 7.5 × 10 ⁻² (Lamp 2) were produced.

FIG. 1 shows the result obtained by examining whether the emission spectrum changes with the addition of hydrogen gas. From the figure, it can be seen that the reference lamp filled with only Xe and the hydrogen gas were 7.5.
In the lamp 2 was sealed against Xe inclusion molar ratio of × 10 ^-2, the shape of the spectrum it can be seen that not appear change the color temperature of the discharge from being comparable. That is, it was found that there was no problem in using the lamp shown in each of the above embodiments.

A mixed gas of a rare gas and hydrogen can be sealed as a gas in the arc tube at a desired ratio. However, in order to further improve the lighting characteristics, hydrogen gas is mixed in the arc tube only during lamp operation. Gas atmosphere can be realized. That is, a hydrogen storage metal, for example, _a Group IVa metal represented by titanium, _a Group Va metal represented by vanadium,
Lanthanum-based rare earth metal represented by lanthanum, or
A predetermined amount of hydrogen is previously absorbed in an alloy containing these metals, and the temperature becomes 600 ° C. or more by a lamp operation such as a certain portion of the arc tube, for example, the body 6 and the core 7 of the anode as shown in FIG. It is a part that can be fixed. For example, the hydrogen storage metal formed into a coil shape can be fixed by winding it around a portion where the temperature becomes 600 ° C. or higher by a lamp operation.

At the portion where the hydrogen storage metal is provided, the stored hydrogen molecules are released by raising the temperature during lamp operation. The amount of release depends on the amount of metal and the temperature of the installation during lamp operation,
It is determined by the saturation concentration of the hydrogen storage metal with respect to hydrogen at that temperature. When the lamp is turned off and the temperature of the hydrogen storage metal decreases, the hydrogen released in the gas phase returns to the hydrogen storage metal again, and only a rare gas is present in the discharge space. It will not be. Note that a hydrogen storage alloy can also be used when deuterium gas is used instead of hydrogen gas. In each of the above-described embodiments, deuterium gas can be used instead of hydrogen gas.

When zirconium is used as a hydrogen storage metal in a lamp containing Xe as a rare gas at room temperature at about 15 atm, zirconium causes a reversible reaction of absorption and release of hydrogen at about 600 ° C. When the amount is maintained in the arc tube and the light is turned off, the temperature in the arc tube decreases, and only the rare gas is present in the arc tube.

Next, in order to keep the luminous efficiency of the rare gas discharge lamp high and increase the discharge voltage, it is necessary to maintain the hydrogen concentration in the discharge space at a predetermined value. When silica glass is used for the arc tube material, there is a concern that hydrogen gas diffuses and escapes from the discharge space. The inventors have tried to make the discharge space have a constant concentration of hydrogen for a long time.

Specifically, the arc tube has a double tube structure, and a mixed gas of a rare gas and hydrogen having a desired hydrogen concentration is supplied to the space between the inner tube and the outer tube and to the inside of the inner tube at the same concentration. To be enclosed. Hydrogen gas diffuses and diffuses through the silica glass from the outer tube.However, the temperature of the outer tube during the lamp operation is low, diffusion of hydrogen gas from the outer tube is unlikely to occur, and hydrogen gas diffuses from the inner tube inside. Dissipation was very delayed, and there was no decrease in the luminous efficiency of the lamp during the practical use of the lamp, which could be attributed to the reduced hydrogen gas concentration. It has also been confirmed that even when the outer tube is made of glass containing at least 10% of an element other than SiO ₂ , such as aluminosilicate glass or borosilicate glass, there was no decrease in luminous efficiency, which is considered to be caused by a decrease in hydrogen concentration. .

The escape of hydrogen molecules from the arc tube could also be prevented by using a ceramic arc tube having a diffusion coefficient several orders of magnitude lower than that of silica glass. Specifically, a sintered body of translucent alumina ceramics was used as an arc tube. When Xe was selected as a rare gas and an experiment was performed, the hydrogen gas was compared with a conventional rare gas discharge lamp for 1,000 hours.
Even when sealed up to 5 × 10 ^-2 , the luminous flux change was not much different from that of the conventional rare gas discharge lamp, and the luminous efficiency continued to be 2.2 times higher than that of the conventional rare gas discharge lamp. The arc tube made of ceramic has a linear transmittance lower than that of silica glass by 30% or more.

Therefore, when the efficiency was compared with the horizontal radiation intensity, a decrease in efficiency of about 30% was expected. However, unexpectedly, the decrease in efficiency was not so large, and the molar ratio of hydrogen gas charged to Xe was small. In the case of 7.5 × 10 ⁻² , the luminous efficiency was twice as high as that of the Xe discharge lamp made of silica glass. This is because the use of a translucent ceramic arc tube inevitably results in a higher refractive index than conventional silica glass arc tubes, and increases the temperature of the gas inside the arc tube due to the repeated reflection of light within the arc tube. It can be considered that the luminous efficiency can be maintained because the effect increases the arc temperature and increases the number of atoms of the luminescent species excited to the excited state.

The translucent ceramic may be made of yttrium aluminum garnet (YAG) or zirconia ceramic. When an arc tube made of translucent ceramics is used, a frit seal in which a glass frit is poured between a niobium tube forming a lead portion of an electrode and the arc tube has been used as a sealing method of a sealing portion.
Normally, the niobium tube is exposed in the arc tube, and as described above, due to the hydrogen storage characteristics of niobium, some hydrogen gas or deuterium gas is absorbed by the niobium tube and dissipated, reducing the hydrogen concentration. Therefore, other methods for preventing hydrogen dissipation were also studied.

When an arc tube made of translucent ceramics is used, niobium is generally used as the electrode core wire. Since niobium is one of the hydrogen storage metals, the inventors succeeded in forming a molybdenum coating on the surface of the niobium electrode core exposed in the discharge space to prevent the reduction of hydrogen molecules from the arc tube. Specifically, a niobium pipe is covered with a molybdenum pipe at the time of drawing a niobium pipe as an electrode core wire, and both are drawn together to form a pipe having a diameter of 1.4 mm. The molybdenum coating of the outer skin of the portion corresponding to the arc tube sealing portion of the pipe thus processed is removed before the sealing process in order to ensure the hermetic sealing at the sealing portion. Sealed with exposed niobium and frit glass.

Using a niobium tube as an exhaust tube and an electrode core,
Unlike the conventional method of hermetically sealing with a ceramic arc tube and frit glass, a non-conductive powder and a conductive powder of the same material as the arc tube are continuously or stepwise in the length direction in the sealing portion. Mixing and molding at different ratios, a sealing material made of a functionally graded material having one end non-conductive and the other end conductive is used. Hermetic sealing using a sealing member made of a functionally graded material eliminates the need for a hydrogen-absorbing metal such as a niobium tube in the sealing portion, and prevents the niobium-made member from protruding into the discharge space, thus enclosing it. The hydrogen gas does not diffuse and dissipate. Further, by using the functionally graded material, the size of the arc tube end is shortened, and the lamp is small and compact. An example is shown in FIG. The numbers and names of the lamp components are the same as in FIG. 9, and 8 is a functionally graded material.

The present invention is similarly applied to an electroded discharge lamp and an electrodeless discharge lamp. FIG. 11 shows a configuration diagram of the electrodeless lamp.
10 is an arc tube, 11 is a magnetron as a microwave generator, 12 and 13 are loop antennas, 14 is a waveguide,
Reference numeral 15 denotes a lighting start lamp. Further, the present invention is applicable to both AC lighting and DC lighting.

[0045]

According to the rare gas discharge lamp, in addition to the rare gas, hydrogen gas or deuterium gas is sealed in a predetermined molar ratio with the rare gas according to the kind of the rare gas. As a result, the luminous efficiency is improved in the range of 10 to 100% as compared with the conventional rare gas discharge lamp, the lamp current at the time of lighting can be reduced, the lamp voltage can be increased, and the lighting power source can be downsized. . Also, A
In the rare gas discharge lamp in which at least one of r, Kr, and Xe is sealed, the luminous efficiency of the rare gas discharge lamp in which a predetermined amount of He is sealed in a mole ratio of the rare gas to the rare gas is the same as that of the conventional lamp. Compared to rare gas discharge lamps,
It improves in the range of 10 to 100%.

[Brief description of the drawings]

FIG. 1 shows a measurement result of an emission spectrum of a rare gas discharge lamp of the present invention when the rare gas is Xe.

FIG. 2 shows a measurement result of a relationship between the luminous efficiency of the rare gas discharge lamp of the present invention and the filling ratio of hydrogen gas when the rare gas is Ar.

FIG. 3 is an enlarged view of the measurement result of the relationship between the luminous efficiency of the rare gas discharge lamp of the present invention and the filling ratio of hydrogen gas when the rare gas is Ar in the vicinity of a 10% increase in luminous efficiency.

FIG. 4 shows the measurement results of the relationship between the luminous efficiency of the rare gas discharge lamp of the present invention and the filling ratio of hydrogen gas when the rare gas is Kr.

FIG. 5 is an enlarged view of the measurement result of the relationship between the luminous efficiency of the rare gas discharge lamp of the present invention and the filling ratio of hydrogen gas when the rare gas is Kr, in the vicinity of a 10% increase rate of the luminous efficiency.

FIG. 6 shows the measurement results of the relationship between the luminous efficiency of the rare gas discharge lamp of the present invention and the hydrogen gas filling ratio when the rare gas is Xe.

FIG. 7 is an enlarged view of the measurement result of the relationship between the luminous efficiency of the rare gas discharge lamp of the present invention and the enclosing ratio of hydrogen gas when the rare gas is Xe, near the luminous efficiency increase rate of about 10%.

FIG. 8 is a view showing a hydrogen gas sealing effect on luminous efficiency in each case when Xe, Kr, Ar and hydrogen gas are mixed and sealed.

FIG. 9 is a schematic view of an electrode type short arc type rare gas discharge lamp according to an embodiment of the present invention.

FIG. 10 is a schematic view of a short arc type rare gas discharge lamp of an electrode type according to the present invention using a functionally graded material for a sealing portion.

FIG. 11 is a configuration diagram including a lighting device for an electrodeless rare gas discharge lamp according to an embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 arc tube 2 sealing portion 3 electrode 4 electrode 5 base 6 anode body 7 core wire portion 8 sealing member made of functionally graded material 9 chip tube portion 10 arc tube 11 magnetron 12 loop antenna 13 loop antenna 14 waveguide 15 Lighting start lamp

──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. ⁶ Identification code FI H01J 61/36 H01J 61/36 C

Claims (10)

[Claims] In a rare gas discharge lamp in which an argon gas (Ar) is sealed in an arc tube, a hydrogen gas or a deuterium gas in an amount of 1 × 10 ⁻³ or more and 0.5 or less with respect to Ar is charged. A rare gas discharge lamp sealed in the arc tube. 2. A rare gas discharge lamp in which krypton gas (Kr) is sealed in an arc tube, a hydrogen gas having an amount of 5 × 10 ⁻³ or more and 0.3 or less in a mole ratio of Kr to Kr.
Alternatively, a rare gas discharge lamp characterized in that deuterium gas is sealed in the arc tube. 3. In a rare gas discharge lamp in which xenon gas (Xe) is sealed in an arc tube, a hydrogen gas or a deuterium gas in an amount of 1 × 10 ⁻² or more and 0.2 or less with respect to Xe is charged. A rare gas discharge lamp sealed in the arc tube. 4. In a rare gas discharge lamp in which xenon gas (Xe) is sealed in an arc tube, a hydrogen gas in an amount of 5 × 10 ⁻² or more and 0.09 or less in terms of a mole ratio of Xe to Xe.
Alternatively, a rare gas discharge lamp characterized in that deuterium gas is sealed in the arc tube. 5. A rare gas discharge lamp in which at least one of Ar, Kr, and Xe rare gas is sealed in an arc tube, wherein a mole ratio of the rare gas to the rare gas is 1 × 10 ⁻² or more and 0.2 or less. A rare gas discharge lamp characterized in that a quantity of helium (He) is sealed in the arc tube. 6. The rare gas discharge lamp according to claim 1, wherein the arc tube is made of translucent ceramics. 7. An arc tube made of silica glass, and the arc tube is housed in a second hermetic container filled with hydrogen gas or a mixed gas of deuterium gas and a rare gas. The rare gas discharge lamp according to any one of claims 1 to 5, wherein the rare gas discharge lamp has a structure. 8. In order to realize a mixed gas state of a rare gas (Ar, Kr, Xe, He) and a hydrogen gas or a deuterium gas under the conditions of claim 1 only during lamp operation, A rare gas discharge lamp in which a hydrogen gas is previously absorbed in a hydrogen storage metal or a hydrogen storage alloy, and the hydrogen storage metal or the hydrogen storage alloy is sealed in an arc tube together with the rare gas. 9. A pair of electrodes are opposed to each other in an arc tube having a sealing portion at both ends, and the sealing portion is formed of a non-conductive powder of the same material as the arc tube and a conductive powder in a length direction. The rare gas according to claim 6, comprising a functionally graded material in which one end is made non-conductive and the other end is made conductive by continuously mixing or stepwise mixing at different ratios. Discharge lamp. 10. A rare gas discharge lamp in which metal niobium (Nb) is used for an electrode core of a ceramic arc tube, wherein the Nb electrode core exposed to a discharge space is covered with a molybdenum coating. 7. The rare gas discharge lamp according to 6.