JPH1167148A - Metal halide lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high color rendering type and compact metal halide lamp, which is good in color-rendering properties and has a color temperature of not less than 10,000 K to reproduce a natural ocean color and an average color rendering index (Ra) of not less than 90 to vividly reproduce colors of heliotropic corals and sea weeds. SOLUTION: At least an iodide of indium(In), dysprosium(Dy) and neodymium(Nd) with a noble gas for starting and mercury are sealed in an arc tube 1 equipped with electrodes 2 at both ends. 0.1 mg-0.2 mg of the indium iodide (InI) is sealed, and a mixed crystal body (DyI3 -NdI3 ) of the iodide of the dysprosium(Dy) and Neodymium(Nd) is sealed within 15<=DyI3 -NdI3 /InI<20 by wt. percentage with respect to the indium iodide.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a high color rendering small metal halide lamp used as a light source for aquarium illumination.

[0002]

2. Description of the Related Art Conventionally, a fluorescent lamp has been used as a light source for aquarium lighting. However, even if the fluorescent lamp has a low luminous flux and illuminates the water surface, the light is diffusely reflected at the upper part of the aquarium.
Since irradiation from the center of the water tank to the lower part has not been sufficiently performed, small metal halide lamps have been used in recent years, and even in a water tank having a depth of 1 m, the irradiation light can reach the lower part of the water tank sufficiently.

[0003]

At present, a color temperature of 6,500K is used as a light source for aquarium illumination.
It is a small metal halide lamp of high color rendering type with an average color rendering index (Ra) of 90 or more. However, in order to reproduce the color of the natural sea in an aquarium and obtain lighting suitable for natural viewing, the color temperature However, a metal halide lamp of 10,000K or more is required.

[0004] However, at present, the color temperature is 10,000.
Small metal halide lamps of 0K or more have a spectral distribution as shown in FIG. 4, and special color rendering indexes R ₁₀ , R ₁₁ and R ₁₃ having a high correlation with the average color rendering index (Ra) are small,
Since the average color rendering index (Ra) is 75 or less, the color rendering property is poor, and there is a problem that it is not possible to reproduce beautiful colors of fish, tropism corals, seaweeds, etc. vividly. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has a color temperature at which a natural sea color can be reproduced at 10,000 K or more, and a beautiful color of fish,
An object of the present invention is to provide a small, high-color-rendering metal halide lamp having an excellent color rendering property, having an average color rendering index (Ra) of 90 or more, which can vividly reproduce colors such as sun-friendly corals and seaweeds.

[0006]

In order to solve the above-mentioned problems, a first aspect of the present invention is to provide an arc tube provided with electrodes at both ends at least indium (In), together with a starting rare gas and mercury.
It encloses dysprosium (Dy) and neodymium (Nd) iodides, and the indium iodide (InI) contains 0.1%.
1 mg to 0.2 mg of the dysprosium
A mixed crystal of iodide (Dy) and neodymium (Nd) (DyI ₃
-NDI ₃₎ is a weight ratio to the indium iodide is a metal halide lamp, characterized in that 15 is encapsulated in the range of _{≦ DyI 3 -NdI 3 / InI ≦} 20.

A second aspect of the present invention is the metal halide lamp according to the first aspect, wherein the arc tube is incorporated in an outer tube, and nitrogen (N ₂ ) gas is sealed in the outer tube.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the illustrated embodiments. FIG. 1 is a block diagram showing an embodiment of the present invention. In a quartz arc tube 1, iodide of dysprosium (Dy), neodymium (Nd), cesium (Cs), and indium (In) is provided. In addition, mercury and a starting rare gas are sealed, and a pair of electrodes 2 are sealed at both ends of the arc tube 1. Note that, specifically, in a 2 cc arc tube, 2.4 mg of dysprosium iodide, neodymium iodide, and cesium iodide in a ratio of 5: 3: 4, 0.1 mg of InI, 7 mg of mercury and 6650 Pa of argon gas are charged, and the lamp is used by lighting at a tube input of 150 W. Further, the mixed crystal of DyI ₃ -NdI ₃ was 1.6 mg.

The quartz sleeve 3 is held by a stainless steel sleeve auxiliary member 4 and is incorporated together with the arc tube 1 into an outer tube 5 made of hard glass. Also, 6
Is a heat insulating film, 7 is a mixed crystal of zirconium and aluminum
(Zr-Al) getter, 8 is an insulating quartz thin tube, 9 is a filament holder, 10 is a ceramic light shielding plate, and 11 is a base.

FIG. 2 is a graph showing the relationship between the color temperature and the average color rendering index (Ra) of the DyI ₃ -NdI ₃ high color rendering small metal halide lamp with respect to the amount of InI. It is an experiment result figure of FIG. FIG.
As shown in the figure, when the amount of InI added is less than 0.1 mg, the color temperature becomes 10,000 K or lower, and
If the amount of I exceeds 0.2 mg, the average color rendering index (Ra) will be less than 90.

[0011] Figure 3 was performed with InI amount determined by Figure 2, in DyI ₃ -NDI ₃ system lamps, color temperature 14,400K, an embodiment of a high color rendering small metal halide lamp Ra has realized 96 It is a spectral distribution figure of an example. I
By adding a predetermined amount of nI, the color temperature can be increased to 10,000K.
Dy, which emits light in the entire wavelength band of visible light, is activated, and the average color rendering index (R
Special color rendering index is high correlation between _{a) R 10, R 11,} R 13 increases, color rendering index (Ra) was also able to 90 or more.

FIG. 5 shows the chromaticity points of both the embodiment according to the present invention and the conventional example on chromaticity coordinates. In FIG. 5, point A is the high point of the embodiment according to the present invention. This is a small color rendering metal halide lamp having chromaticity coordinates (x, y) of (0.268
3, 0.2649), which is almost on the blackbody locus. A point B in the figure is a conventional high color rendering small metal halide lamp having a chromaticity coordinate (x, y) of (0.266).
4, 0.3118), it is clear from the chromaticity coordinates that the difference in both color rendering properties is obvious.

Further, with respect to the deviation (Duv) from the color of blackbody radiation according to Planck's radiation law, the high color rendering small metal halide lamp of one embodiment according to the present invention is -4, and the high color rendering small metal halide lamp of the conventional example is -4. If Duv is within the range of ± 5, there is almost no deviation from the color of blackbody radiation according to Planck's radiation law, so that the present invention is clearly compared with the conventional example. It can be seen that the color rendering properties are excellent.

Further, where the outer tube has life test the vacuum lamp and N ₂ gas-filled lamps, lamp filled with N ₂ gas in the outer tube, when the outer tube is compared with the vacuum ramp, the lights 6000 hours It was confirmed that the residual ratio of the lamp increased about five times. This is because, by filling the outer tube with the N ₂ gas, the temperature of the arc tube at the time of lighting is controlled, and the reaction between the quartz and the plug is not promoted. In addition, the filling pressure of N ₂ gas is 39,000 Pa to 41,000.
0 Pa is optimal.

[0015]

As described above, according to the present invention,
By adding a predetermined amount of InI to a DyI ₃ —NdI ₃ system high color rendering small metal halide lamp, a color temperature of 10,
A metal halide lamp with a Ra of 90 or more can be realized at 000K or more. In addition to being able to reproduce the color of the natural sea in the aquarium, it is also possible to reproduce beautiful colors of fish, vivid coral, seaweed and other vivid colors. Lighting that is suitable for natural viewing. In addition, by enclosing N ₂ gas in the outer sphere, a long life, high color rendering small metal halide lamp can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a high color rendering small metal halide lamp of the present invention.

FIG. 2 is a graph showing experimental results on color temperature and average color rendering index (Ra) with respect to the amount of indium iodide added.

FIG. 3 is a spectral distribution diagram of the lamp according to the embodiment of the present invention.

FIG. 4 is a spectral distribution diagram of a conventional lamp.

FIG. 5 is a diagram showing chromaticity points of both an embodiment according to the present invention and a conventional example on chromaticity coordinates.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Arc tube 2 Electrode 3 Sleeve 4 Sleeve auxiliary material 5 Outer tube 6 Thermal insulation film 7 Zr-Ar getter 8 Insulated quartz thin tube 9 Filament holder 10 Light shield plate 11 Base

Claims (2)

[Claims] An arc tube provided with electrodes at both ends is filled with at least indium (In), dysprosium (Dy) and neodymium (Nd) iodides together with a starting rare gas and mercury. Indium (InI) is 0.1m
g-0.2 mg, said dysprosium (Dy)
A mixed crystal of iodide neodymium (Nd) (DyI ₃ -Nd
I ₃ ) is 15% by weight with respect to the indium iodide.
≦ DyI ₃ −NdI ₃ / InI ≦ 20. A metal halide lamp sealed in the range of ≦ 20. 2. The metal halide lamp according to claim 1, wherein the arc tube is incorporated in an outer tube, and nitrogen (N ₂ ) gas is sealed in the outer tube.