JP3196647B2 - Electrodeless high pressure discharge lamp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention fills a light-transmissive bulb with a metal halide having continuous light emission by molecular light emission and emits an arc discharge to achieve extremely excellent color rendering and high efficiency. The present invention relates to a realized electrodeless high-pressure discharge lamp.

[0002]

2. Description of the Related Art In recent years, high-pressure discharge lamps, particularly metal halide lamps, have high efficiency and high color rendering properties. Applications to such applications are underway. In addition, due to its high color rendering properties, the development of sports lighting compatible with HDTV broadcasting and facility lighting of museums and art galleries has been promoted. However, since metal halide lamps contain mercury as a filler in a large amount of several tens of mg / cc per inner volume, mercury-free is strongly desired from the viewpoint of environmental protection.

[0003] The electrodeless discharge lamp device has the advantage that, compared to the electrode arc discharge lamp device, it is easy to couple electromagnetic energy to the filling and it is easy to omit mercury from the filling for discharge luminescence. Have. Further, since no electrodes are provided inside the discharge space, blackening of the bulb inner wall due to electrode evaporation does not occur. This can significantly improve the lamp life.

[0004] The mercury-free filling of a conventional high-pressure discharge lamp will now be described with some examples. JP-A-3-
In the electrodeless discharge lamp disclosed in Japanese Patent No. 152852, xenon is used as a discharge gas and L is used as a luminescent material.
White light is obtained by enclosing iI, NaI, TlI, InI, and the like, and combining monochromatic emission line spectra emitted from these luminescent materials. Here, means for inductively coupling RF energy is exemplified as the discharge excitation means.

Further, in a high power lamp disclosed in Japanese Patent Application Laid-Open No. 6-132018 (US Pat. No. 5,404,076), S ₂ , Se _2, etc. are sealed as a luminescent substance, and a continuous spectrum by molecular luminescence is used. As a result, greenish white light is obtained. Here, a discharge excitation unit using microwave energy is illustrated.

In the present invention, the molecular luminescence of a metal halide such as indium iodide is utilized. An invention relating to an electroded metal halide lamp having a similar filling is disclosed in U.S. Pat. No. 3,259,777. Here, in order to discharge a metal halide such as indium iodide at a high pressure, the lamp operates at a high input electric energy such that the electrode approaches the melting point.

[0007]

SUMMARY OF THE INVENTION However, Japanese Patent Application Laid-Open
In the electrodeless discharge lamp disclosed in JP-A-152852, the color rendering property is lowered when the efficiency is increased by increasing the components of Na and Tl which emit light in a portion having high luminous efficiency, and the efficiency is increased when the color rendering property is enhanced. There was a problem that it became low.
It has also been pointed out as a problem that indium and thallium iodides generate a continuous spectrum when the pressure is increased and the emission line spectrum is reduced to cause a color shift. In addition, the light characteristics composed of a combination of bright line spectra as disclosed in JP-A-3-152852 are poor in color reproducibility, and it is difficult to obtain a sufficiently high color rendering property.

In the high-power lamp disclosed in Japanese Patent Application Laid-Open No. 6-132018, the chromaticity is always located at a position shifted from the blackbody locus considerably to green, even if the kind of gas and the condition of the filling are changed. White light cannot be obtained. JP-A-6-1
As a method of improving the color characteristics of the high power lamp disclosed in Japanese Patent No. 32018, a method of adding a metal compound as a luminescent substance to change the chromaticity by adding a bright line spectrum or the like can be considered. However, many of the metal sulfides formed by the reaction of the added metal compound with sulfur are relatively stable and have a low vapor pressure, and are unlikely to become plasma. For this reason, the types of metals that can be added are limited, and there is a problem that the degree of freedom in light color design is low and it is difficult to achieve high color rendering. Further, when an inclusion is added or the spectral characteristic of the emission spectrum is changed by a color temperature conversion filter or the like, the spectral radiant intensity of a portion having low visibility other than green increases, so that a decrease in efficiency is inevitable.

In US Pat. No. 3,259,777, a significant load is placed on the electrodes to operate them with mercury-free at the electrodes and to operate the lamp near the melting point of the electrodes. Therefore, in the lamp having such a design, the inner wall of the bulb is suddenly blackened due to the evaporation of the electrode, and it is unavoidable that the life characteristic is significantly reduced.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems associated with the conventional filling material as a discharge luminescent substance and discharge excitation means, and emits a continuous spectrum by molecular luminescence such as indium, gallium and thallium halides. Active use of the continuous spectrum of molecular luminescence at high pressure of metal halides makes it possible to use electrode-free high-pressure materials that do not contain mercury and have high efficiency and high color rendering. It is an object to provide a discharge lamp.

[0011]

In order to achieve this object, an electrodeless high-pressure discharge lamp according to the present invention comprises an indium halide and a gallium halide in a light-transmitting bulb having no electrodes exposed inside. Yes halides, halides of thallium or mixture selected from the group consisting of compounds Rukin genus halide thereof, and a filling of rare gas
The filling amount of the metal halide is controlled by the light-transmitting
Inner wall of the light-transmitting bulb in the direction of the electric field applied to the light-transmitting valve.
About 0.5 × 10 ^-5 mol or more per 1 cm distance , provided
About 1 cc of the volume of the discharge space of the light-transmitting bulb
Excluding 0.5 × 10 ^-6 mol or more, including mercury
Has no configuration.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows that an indium iodide (InI) per unit length of an inner diameter corresponding to a distance between inner walls of the bulb in a direction of an electric field is provided inside an electrodeless discharge bulb made of spherical quartz glass having an inner diameter of 3.8 cm. 2.2 × 10 ^-5 mol
FIG. 3 is an emission spectrum when a lamp filled and sealed with 5 torr of argon gas is discharged and emitted with a microwave energy input of 800 W in the microwave electrodeless discharge lamp device shown in FIG. Note that the emission spectra shown in this specification are all obtained by integrating the radiation intensity at every 5 nm, and the maximum value of the radiation intensity is normalized to 1.

The configuration of a conventional microwave electrodeless discharge device for obtaining radiation light according to the present invention as shown in FIG. 1 will be described with reference to FIG. The configuration of the microwave electrodeless discharge device is the same as that of the high power lamp disclosed in Japanese Patent Application Laid-Open No. Hei 6-132018.

In FIG. 2, a valve 21 has a filling 22 such as indium iodide or argon gas.
It is made of quartz glass. The bulb 21 is supported in the microwave cavity 24 by a support rod 23 made of a dielectric material. The support rod 23 may be connected so that the axis of the support rod coincides with the rotation axis of the motor. At that time, the valve 21 is driven by
Rotate at 3600 rpm. In the embodiment whose emission spectrum is shown in FIG. 1, light was emitted while rotating the bulb at 3600 rpm.

As a result, the temperature of the bulb 21 can be equalized and the discharge plasma can be stabilized. The microwave energy generated by the magnetron 27 is supplied to the power supply port 25 of the microwave cavity 24 through the waveguide 26. The supplied microwave energy excites the filler 22 inside the bulb 21 to generate light in a plasma state. By making the microwave cavity 24 a conductive mesh or the like configured to substantially not transmit microwave energy and to substantially transmit light generated by the bulb 21, the generated light is It is taken out of the wave cavity 24.

According to this embodiment as shown in FIG.
Intense continuous spectrum light emission over the entire visible region can be obtained by indium iodide. What is widely known as an emission spectrum of indium iodide in high-pressure discharge is a bright line spectrum of blue portions of 410 nm and 451 nm of indium element. This emission line spectrum is generally used to increase the blue light emission intensity of a metal halide lamp. However, in the present embodiment, the emission line spectrum of the indium element is very weak, and a continuous spectrum of molecular emission appears over the entire visible range. This makes it possible to obtain a highly efficient white light source having extremely excellent color rendering properties.

First, an example of a conventional metal halide lamp having electrodes will be described for comparison of color rendering properties. Hg + I
In a metal halide lamp mainly composed of a bright line spectrum in which nI + TlI + NaI is enclosed, an average color rendering index R
_a is about 60, the special color rendering index R ₉ representing the appearance of vivid red is approximately -150. The lamp efficiency is about 8
0 lm / W. Although color rendering is low in all light colors, it can be said that there is almost no reproducibility of particularly vivid red.

According to the present embodiment, on the other hand, the general color rendering index R _a is 96, the lamp efficiency is about 100lm / W. Further, it is difficult to exhibit a generally high value, the special color rendering index R ₉ representing the appearance of vivid red was 77. As described above, the lamp according to the present embodiment exhibits extremely excellent color rendering properties and excellent luminous efficiency.

Another advantage of the electrodeless high-pressure discharge lamp of the present invention is that a filling as a main discharge generating source can be used alone. A typical metal halide lamp contains several metals and metal halides as fillers to obtain white light. The partial pressure of the added metal is determined by the amount of filling inside the lamp and the temperature at the coldest point of the bulb. However, both the amount of the filler and the temperature of the coldest point change parameters due to factors such as manufacturing tolerances and aging.
This causes changes in optical characteristics such as the total luminous flux and chromaticity of the emitted light.

For example, in a metal halide lamp made of a filler such as Hg + InI + TlI + NaI, a white color is obtained by combining the blue of In, the green of Tl element, and the yellow of Na element. affect. However,
It has been pointed out that metals widely used in metal halide lamps, such as Na, Sc, and Dy, react with quartz glass, which is the envelope of the lamp, during operation and reduce the effective filling amount for discharge. . This causes a color shift of the lamp and a decrease in light output as a change with time. On the other hand, since the lamp of the present invention can be constituted by a single metal halide, the influence on the color characteristics due to manufacturing tolerances and aging can be greatly reduced.

Next, Table 1 shows some examples of light emission characteristics by adding a bulb in which the amounts of indium iodide and indium bromide are changed. All the bulbs shown here are 3000 to 360 in the microwave electrodeless discharge device shown in FIG.
This is a case where the lamp is lit with 800 W of input electric energy while rotating at 0 rpm.

[0023]

[Table 1]

It is clear that indium bromide can realize a lamp having a higher correlated color temperature for the same filling amount as compared with indium iodide. In addition, although the above-described embodiment is described in the second line, it can be seen that the value of the color rendering index can be further improved by changing the enclosing amount and the like. Special color rendering index R ₉ representing the appearance of bright red showed values up to 95.

Both indium iodide and indium bromide
As the amount of encapsulation increases, the correlated color temperature tends to decrease. This is because the peak wavelength of the continuous spectrum of molecular emission of indium halide shifts to a longer wavelength as the amount of encapsulated material increases. This is considered to be because the internuclear distance of the indium halide molecules becomes closer and the energy difference of the transition becomes smaller as the molecular weight of the indium halide during operation increases. However, the amount of this color shift is not sensitive to small changes that would be problematic for the previously mentioned manufacturing tolerances.

On the contrary, this characteristic gives a degree of freedom in designing the correlated color temperature. Therefore, it is possible to provide a lamp having an appropriate correlated color temperature for various application fields.
For example, as a light source for a liquid crystal video projector, a lamp having a higher correlated color temperature of 7000 K or higher is required in order to increase the blue color. The electrodeless high-pressure discharge lamp of the present invention can meet such demands by changing the amount of indium halide to be charged.

The color rendering and correlated color temperature are determined by the shape of the spectral spectrum radiated from the discharge arc, and the luminous efficiency is greatly affected. The shape of the spectrum is
It is largely determined by the arc temperature. “The High Pressure Makuri Vapurges Charge” (W. Ele
nbaas "The High PressureMe
rcury Vapor Discharge; No
rth Holland Publishing Co
mpany (1951) "), the effective temperature Teff of the arc of the high-pressure mercury discharge lamp is expressed by the following equation.

[0028]

(Equation 1)

Here, P is the input electric energy per unit length of the arc (such as W / cm), P _cond is the heat conduction loss per unit length of the distance between the electrodes of the arc (such as W / cm), m the amount of enclosed mercury per unit length of the inter-electrode distance of the arc (mg / cm etc.), R _eff is the effective radius of the arc, the V _a average excitation potential of mercury, the C ₁ and γ are constants. An actual discharge arc has a temperature distribution that is highest in the center in the radial direction and becomes lower as it approaches the tube wall. Here, for the sake of simplicity, a uniform effective temperature is defined, the distance between the electrodes is defined as the arc length, and an approximate calculation is performed using a cylindrical arc whose effective radius is represented by R _eff .

The above is the case of a high-pressure mercury lamp with electrodes, but the electrodeless high-pressure discharge lamp as shown in the present embodiment also has the same amount of luminous substance per unit length of arc and input energy. The spectral characteristics can be determined approximately.
However, since the electrodeless high pressure discharge lamp has no electrodes, the length of the arc between the electrodes is replaced by the effective length of the arc in the electric field direction of the input electric energy. In order to derive the effective length of the arc, the average value must be calculated from the temperature distribution of the arc, but this method is very complicated because the temperature distribution changes depending on the filling amount of the arc and the input energy. Not suitable as a design tool.

In an electrodeless high-pressure discharge lamp, it is considered that the magnitude of the arc changes substantially in proportion to the distance between the inner walls of the bulb (in the case of a spherical bulb, the inner diameter). Therefore,
If the distance between the inner walls of the bulb in the direction of the electric field of the input electric energy is approximated as the length of the arc, and the filling amount per unit length and the input electric energy are determined, almost the same spectral characteristics can be obtained. Based on the above concept, the input electric energy per unit length of the distance between the inner walls of the bulb in the direction of the electric field and the change in the spectral characteristics with respect to the luminescent substance were measured, and a suitable value was determined. Thereby, an index for changing the shape of the discharge bulb in various ways can be obtained, and the design can be performed efficiently. The following is a variation of the input electrical energy for the electric field direction of the input energy and the change in filling amount of indium halide per unit length of the inner wall distance of the bulb, the lamp efficiency and general color rendering index R _a.

FIGS. 3 and 4 show the effect of input energy on the light characteristics of the lamp. FIG. 3 and FIG.
Inside an electrodeless discharge bulb made of spherical quartz glass having an inner diameter of 3.8 cm, 50 torr of argon gas and indium iodide were placed at 1.1 × 10 ⁻⁵ per 1 cm of inner diameter of the bulb.
mol / cm and 2.2 × 10 ⁻⁵ mol / cm, argon gas 10 torr, indium bromide 1.4 × 10 ⁻⁵ mol / cm and 2.7 × 1
The efficiency and the average color rendering index when the input energy was changed in the microwave electrodeless discharge lamp device shown in FIG. 2 were measured for two types of lamps, each of which was filled and filled with 0 ^-5 mol / cm. It is shown. The bulb emitted light while rotating at 3600 rpm by a motor in the same manner as in the above embodiment.

Referring to FIG. 3, it can be seen that the luminous efficiency with respect to the input electric energy of the microwave to the lamp increases as the input electric energy increases. There is a saturation point in this increase in luminous efficiency. This saturation point is at higher input electrical energy as the amount of charge increases.

[0034] that is shown in FIG. 4, the change in the color rendering index R _a with respect to the input electrical energy per unit length of the inner diameter of the valve. Input electric energy is about 50W /
in cm above where, R _a take sufficient 80 or more values as used in general illumination. Also, the input electric energy density is about 100 W / cm or more, more preferably about 150 W / cm.
As described above, it is possible to achieve both higher color rendering properties and higher luminous efficiency.

At low input electrical energy densities, not enough indium iodide has yet evaporated into the bulb, which is one factor that reduces efficiency and color rendering. In the low energy region, since the pressure of the plasma is still low, the emission line spectrum of the indium element alone emits light predominantly. Therefore, sufficient efficiency and color rendering properties cannot be obtained.

[0036] Figure 5 and Figure 6, shows with respect to a change in filling amount of the enclosed indium iodide and indium bromide, the change in efficiency and general color rendering index R _a. The shape of the bulb and the lighting conditions are the same as in FIGS. 3 and 4, and the input electric energy per unit length of the inner diameter of the bulb is that at 210 W / cm. A solid line indicates a change in efficiency with respect to a change in the filling amount, and a dotted line indicates a change in the normal color rendering index. When the filling amount is about 0.5 × 10 ⁻⁵ mol / cm or more per 1 cm,
The average color rendering index is sufficient for general lighting use,
More than 80. The filling amount is about 2 × 10 ^-5 mol
/ Cm or more, the efficiency can be 90 lm / W or more, and the average color rendering index can be as high as 95 or more.

Therefore, for use in the field of general lighting, it is desirable to fill indium iodide in this region. However, when the filling amount is about 5 × 10 ⁻⁵ mol / cm or more for indium iodide and about 7 × 10 ⁻⁵ mol / cm or more for indium bromide, the average color rendering index is 80 or less, and the lamp efficiency is low. It is going down. Therefore, filling indium halide in too large a volume is not desirable for general lighting applications.

(Embodiment 2) Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.

FIG. 7 shows that 2.6 × 10 ⁻⁵ mol / cm of gallium iodide (2.6 × 10 ⁻⁵ mol / cm per unit length of the bulb inner diameter) is placed inside an electrodeless discharge bulb made of spherical quartz glass having an inner diameter of 2.8 cm. GaI3) and a lamp filled with 2 Torr of argon gas were filled in the microwave electrodeless discharge lamp device shown in FIG.
3 is an emission spectrum when discharge light emission is performed with a microwave energy input of FIG.

However, in the present embodiment, no mechanism for rotating the valve is used. In addition, the emission spectrum shown in FIG. 5 is obtained by integrating the radiation intensity at every 5 nm, as in FIG.

Here, 403 nm of gallium element and 4 g
In addition to the 17 nm emission line spectrum, a continuous spectrum by molecular luminescence was obtained in which the emission line spectra of sodium, lithium and potassium contained as impurities were added.

The characteristics of the lamp of this embodiment are as follows: the luminous efficiency of the lamp is 43 lm / W, the average color rendering index _Ra is 96,
The correlated color temperature was 6,920K. The continuous spectrum of the gallium halide has a peak at a shorter wavelength than the continuous spectrum of the indium halide, so that the correlated color temperature becomes higher. This property is suitable for a field requiring a high correlated color temperature lamp such as a light source for liquid crystal video projection. Further, by filling together with indium halide, it can be used for changing characteristics such as correlated color temperature.

Regarding the electrodeless lamp filled with gallium iodide and gallium bromide, when the filling amount is changed, when the input electric energy is changed, the change in the optical characteristics is as follows.
This is the same as the case of the indium halide of the first embodiment.

In the above-described embodiment, indium and gallium halides are shown as metal halides that emit a continuous spectrum by molecular emission. However, thallium halides also emit continuous spectra by molecular emission. It is also possible to use this as a filling metal halide to radiate.

(Embodiment 3) Hereinafter, a third embodiment of the present invention will be described with reference to the drawings.

FIG. 8 shows that 40 mg of zinc (2.2 × 10 ^-4 mol / c per unit length of the inner diameter) was placed inside an electrodeless discharge bulb made of spherical quartz glass having an inner diameter of 2.8 cm.
m), 8 mg of TlI (0.9 × 10 ⁻⁵ mol / c)
m), filled with 2 torr of argon gas,
3. The microwave electrodeless discharge lamp device according to
It is an emission spectrum when discharge light emission is performed with a microwave energy input of 00 W.

According to the present embodiment, as shown in FIG.
Light emission can be obtained in which a continuous spectrum over the entire visible region is added to the 535 nm emission line spectrum of Tl. Filling and enclosing only TlI and argon gas
If light is emitted only bright line spectrum of 35 nm, the color rendering index R _a is not suitable for general lighting is 15 or less.

[0048] However, color rendering index R _a in the present embodiment becomes 84, is greatly improved.

As shown in (Table 2), compared with the case where continuous light emission was obtained by high-pressure discharge without zinc,
The luminous efficiency is twice or more. This is because there is no significant change in the intensity of the 535-nm emission line spectrum, but the light emission in the continuous spectrum part is greatly increased. This is considered to be because the pressure inside the valve has been increased by zinc, and it can be seen that higher efficiency can be obtained by adding zinc.

(Embodiment 4) Hereinafter, a fourth embodiment of the present invention will be described with reference to the drawings.

FIG. 9 shows a spherical quartz glass having an inner diameter of 2.8 cm.
20 mg of zinc (1.1 mg
× 10^-Fourmol / cm) and 10 mg of InI (1.5 ×
10 ^-Fivemol / cm), 5 mg of TlI (0.5 × 10
^-Fivemol / cm) and 1 mg of NaI (0.2 × 10^-Fivem
ol / cm) and 2 torr of argon gas.
To the microwave electrodeless discharge lamp device shown in FIG.
From the discharge emission at 250 W input.
It is a kutor. In this embodiment, In, Tl, Na
In addition to the emission spectrum,
Light was obtained.

[0052] In general color rendering index R _a is 85, the chromaticity (x, y)
Can emit white light of (0.321, 0.336).

The discharge light emission characteristics under other filling and filling conditions according to the third and fourth embodiments are shown in comparison with (Table 2).

[0054]

[Table 2]

By using zinc as a filler, a desired operating pressure suitable for light emission of a metal halide can be obtained without using mercury. Is not limited to the above embodiment. For example, by adding LiI or the like and using a 670 nm emission line spectrum, it is possible to further improve the color rendering properties.

In all of the embodiments, it is clear that the harmful UV radiation of 350 nm or less, which is a problem in mercury-containing high-pressure discharge lamps, is also greatly suppressed.
Much of the UV radiation in conventional metal halide lamps is due to the emission line spectrum of mercury, which is a natural effect that appears because mercury is not included as a fill. This is an important advantage for improving safety to the human body with general lighting and for protecting exhibits in museums and museums.

In the first to fourth embodiments,
Although quartz glass was used as the light transmitting material of the bulb 21 shown in FIG. 2, it goes without saying that the constituent material of the bulb is not limited to this. For example, if a light-transmitting ceramic material of alumina is used as a constituent material of the valve, the heat resistance of the valve can be increased. Thereby, the valve has better high heat resistance and high pressure resistance, and can operate under higher input electric energy.

Further, it is easy to omit the above-described mechanism such as the rotation of the bulb, and it is possible to improve the system efficiency and the manufacturing cost of the electrodeless high-pressure discharge lamp device.

The electrodeless high-pressure discharge lamp according to the present invention shown in the first to fourth embodiments is disclosed in
An electrodeless discharge lamp device that discharges and excites a filler by RF inductive coupling as exemplified in, for example, JP-A-152852 can be similarly implemented.

[0060]

As described above, according to the first invention, at least one halide of indium halide, gallium halide, or thallium halide is provided inside the light-transmitting bulb. their Rukin genus halides such mixtures and at least one noble gas comprises as fillers, the metal halide
Electric charge applied to the light-transmitting bulb
About 1 cm distance between the inner walls of the light-transmitting bulb
0.5 × 10 ⁻⁵ mol or more, provided that the light-transmitting bulb
About 0.5 × 10 ^-6 mol or less per 1 cc volume of discharge space
By excluding the range above, it does not contain mercury as a filler and has a strong continuous emission spectrum due to molecular emission,
An excellent electrodeless high-pressure discharge lamp and an electrodeless high-pressure discharge lamp device capable of obtaining extremely excellent color rendering properties and highly efficient optical characteristics can be realized.

According to the second aspect of the present invention, at least one of zinc, indium halide, gallium halide, and thallium halide, or a halide thereof, is provided inside the light-transmitting bulb. a is selected from the group consisting Rukin genus halide and at least one noble gas comprises as fillers,
The amount of zinc is determined by the electric field applied to the light transmissive bulb.
Per 1 cm distance between the inner walls of the light-transmitting bulb in the direction
About 5 × 10 ⁻⁵ mol or more and the metal halide
The filling amount of the object depends on the electric field applied to the light-transmitting bulb.
About 1 cm per distance between inner walls of the light-transmitting bulbs
0.5 × 10 ⁻⁵ mol or more, provided that the light-transmitting bulb
About 0.5 × 10 ^-6 mol or less per 1 cc volume of discharge space
The scope and be Rukoto except over not contain mercury as a filling, it is possible to combine high efficiency and high color rendering index, it is those that can achieve light emission with excellent high-pressure discharge lamp.

[Brief description of the drawings]

FIG. 1 is a diagram of an emission spectrum of an electrodeless discharge lamp filled with indium iodide and argon according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram of a microwave electrodeless discharge lamp device according to the present invention.

FIG. 3 is a diagram showing a correlation between energy input and luminous efficiency of an electrodeless discharge lamp in which indium halide and argon are sealed according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a correlation between an energy input and an average color rendering index of an electrodeless discharge lamp in which indium halide and argon are sealed according to the first embodiment of the present invention.

FIG. 5 is a diagram showing a correlation between a filling amount of indium halide and luminous efficiency of an electrodeless discharge lamp in which indium halide and argon are sealed according to the first embodiment of the present invention.

FIG. 6 is a view showing the correlation between the filling amount of indium halide and the average color rendering index of the electrodeless discharge lamp in which indium halide and argon are sealed according to the first embodiment of the present invention.

FIG. 7 is a diagram of an emission spectrum of an electrodeless discharge lamp filled with gallium iodide and argon according to a second embodiment of the present invention.

FIG. 8 is a diagram of an emission spectrum according to a third embodiment of the present invention, which is filled with zinc and TlI.

FIG. 9 is a diagram of an emission spectrum according to a fourth embodiment of the present invention, which is filled with zinc, InI, TlI, and NaI.

[Explanation of symbols]

 21 Valve 22 Filling 24 Microwave cavity 27 Magnetron

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-49158 (JP, A) JP-A-6-13052 (JP, A) JP-A-9-120800 (JP, A) JP-A-3-3 152852 (JP, A) JP-A-63-291351 (JP, A) JP 10-507868 (JP, A) US Patent 3,259,777 (US, A) (58) Fields investigated (Int. Cl. ⁷ , DB) Name) H01J 65/00-65/04 H05B 41/24

Claims (9)

(57) [Claims] 1. A light-transmitting bulb for confining a discharge, and at least one metal halide of indium halide, gallium halide, or thallium halide in the light-transmitting bulb. is selected from the group consisting and a filling containing Rukin genus halide and a rare gas, the metal
The halide loading is applied to the light transmissive bulb.
1 cm between the inner walls of the light-transmitting bulb in the direction of the electric field to be applied
0.5 × 10 ^-5 mol or more per light,
About 0.5 × 10 ^-6 per 1 cc volume of discharge space of bulb
a range excluding the above-mol, electrodeless high-pressure discharge lamp, characterized in that you do not contain mercury. 2. A light-transmitting bulb for confining a discharge,
At least indium halogenation inside the light-transmitting bulb
And a filler containing a rare gas.
Applying the loading amount of the halide to the light-transmitting bulb
Distance 1c between the inner walls of the light-transmitting bulb in the direction of the applied electric field
0.5 × 10 ^-5 mol or more per m , provided that the light transmission
0.5 × 10 / cc of discharge space volume
Electrodeless characterized by a range excluding ^-6 mol or more
High pressure discharge lamp. 3. The method of claim 1, wherein the halogen of the metal halide is iodine,
Bromine, chlorine or consists of these mixtures, it is and also rare gases Ar, Kr, also claim 1, characterized in that it is selected from the group consisting of Xe or mixtures thereof,
The electrodeless high pressure discharge lamp according to claim 2 . 4. An electric energy is applied to said filling material to
A light-exciting valve having discharge excitation means for initiating and sustaining a discharge, wherein the electric energy applied by the discharge excitation means is applied to the electric field direction of the electric energy applied by the discharge excitation means. 4. The electrodeless high-pressure discharge lamp according to claim 1, wherein the power is at least about 50 W per 1 cm of the inner wall distance. 5. A light-transmitting bulb for confining a discharge, and zinc and at least one halide of indium halide, gallium halide, or thallium halide in the light-transmitting bulb. It is selected from the group consisting and a filling containing Rukin genus halide and a rare gas, said zinc
Before the direction of the electric field applied to the light-transmitting bulb.
Approximately 5 × 1 per 1 cm distance between inner walls of the light-transmitting bulb
0 ^-5 mol or more, and filling with the metal halide
The amount is in the direction of the electric field applied to the light transmissive bulb.
Approximately 0.5 × per 1 cm distance between inner walls of light-transmitting bulb
10 ^-5 mol or more, provided that the discharge space of the light-transmitting bulb
Excluding about 0.5 × 10 ^-6 mol or more per 1 cc volume
Electrodeless high-pressure discharge lamp, characterized in that the range. 6. The halogen of the metal halide is iodine,
The electrodeless high-pressure discharge lamp according to claim 5, comprising bromine, chlorine, or a mixture thereof, and wherein the rare gas is selected from the group consisting of Ar, Kr, Xe, and a mixture thereof. 7. An electric energy is applied to said filling material,
A light-exciting valve having discharge excitation means for initiating and sustaining a discharge, wherein the electric energy applied by the discharge excitation means is applied to the electric field direction of the electric energy applied by the discharge excitation means. the per inner wall distance 1 cm, electrodeless high-pressure discharge lamp according to claim 5 or claim 6 further characterized in that at least about 50 W. As 8. discharge excitation means, characterized by coupling microwave energy to the fill, claim 4
An electrodeless high-pressure discharge lamp device using the electrodeless high-pressure discharge lamp according to claim 7 . As 9. discharge excitation means, and wherein the inductively coupling RF energy to the fill, claim 4 or
An electrodeless high-pressure discharge lamp device using the electrodeless high-pressure discharge lamp according to claim 7 .