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Metal halide lamp

A metal halide lamp and halide technology, applied in the field of light-emitting tubes, can solve the problems of reduced beam maintenance rate and large change of lamp color temperature, and achieve the effect of improving color temperature drop and high light color temperature

Inactive Publication Date: 2003-04-02
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in conventional metal halide lamps in which cerium iodide and sodium iodide are enclosed as luminescent substances, there is a problem that the light beam maintenance rate decreases significantly with the lapse of the lighting time, and there is also a problem that the color temperature of the lamp changes greatly.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Prepare the lamp 18 that luminous tube 1 forms, and this luminous tube adopts CeI 3 : 35wt% (14mol%), NaI: 60wt% (83.5mol%), Scl 3 : 6 mg of a substance having a composition of 5 wt % (2.5 mol %) was encapsulated as a luminescent substance 17, and lifetime characteristics related to aging were studied. The result is as image 3 As shown by the line of Ce / Sc / Na, the beam maintenance of the lamp is greatly improved to 65% at an aging time of about 12000 hours. Moreover, the color temperature change during aging is within -150K, which is better than that without ScI 3 Good times.

[0030] Then, in the analysis of the lamp after 5000 hours of the same aging time as above, it was found that the CeI in the tube 3 There is still enough remnants of 80-90% of the original enclosed volume, on the other hand ScI 3 It reacts more with alumina ceramics, and only 20-30% remains.

[0031] Moreover, the initial lamp characteristics of the lamp 18 of this embodiment are maintained...

Embodiment 2

[0043] Under the same conditions as in Example 1, when CeI 3 When it is 100 mole parts, change scandium iodide ScI in the range of 0-200 mole parts 3 The encapsulation amount of the lamp is carried out to carry out the aging test of the lamp. The results show that when scandium iodide ScI 3 When the encapsulation amount of Tungsten exceeds 100 mole parts, the tungsten electrodes 6 and 7 are deformed and worn out, and the luminous tube is blackened, thereby decreasing the luminous flux maintenance ratio on the contrary. Moreover, iodide ScI 3 The effect of inhibiting the halide reaction of aluminum oxide and cerium is not clearly observed when the amount of the compound contained is less than 1.5 mole parts.

[0044] According to the test results, when CeI 3 When it is 100 mole parts, scandium iodide ScI is preferred 3 The effective enclosing amount is in the range of 1.5-100 mole parts. In this case, enclosing ScI 3 In lamps with 150 mole parts or more, a trace amount o...

Embodiment 3

[0052] Next, as a study related to the above-mentioned analysis (b), a means for suppressing the shrinkage and bending of the discharge arc generated by the cerium halide luminescent substance of the above-mentioned prior art and improving the light beam maintenance ratio is searched for. As a further goal it is possible to increase the means of lamp efficiency. As a result, it was found that especially as a luminescent substance, it is effective to re-enclose with a combination of TlX, a halide of thallium, and InX, a halide of indium.

[0053] Specifically, the above-mentioned (CeI3+NaI+ScI3) of the present invention was prepared in which TlI and InI whose composition was changed in the range of 0 to 10 wt% were also enclosed in the lamp 18, and its initial characteristics and aging-related light beam maintenance were measured. Rate.

[0054] As a result, it was observed that basically the encapsulation of TlI and InI broadened the discharge arc and suppressed the bending o...

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Abstract

Provided is a metal halide lamp, comprising a luminous tube (3) whose outer shell is made of an oxide-based light-transmitting ceramic material, and cerium halide as a luminous substance 17 and the cerium halide that are easily compared with the cerium halide. The halides of the rare earth elements reacted with the ceramic materials are sealed in the luminous tubes respectively. This promotes the reaction between the oxide-based translucent ceramic material and halides of rare earth elements, suppresses the reaction between the oxide-based translucent ceramic material and cerium halides, and suppresses the reduction of cerium halides that provide light emission. , can reduce the change of lamp color temperature. As a result, the light beam maintenance rate and color temperature reduction related to lamp aging are improved, and a high-wattage type, high-efficiency, and long-life aluminum oxide ceramic tube metal halide lamp is provided as a white light source color for general indoor and outdoor use.

Description

[0001] The technical field of the invention [0002] The invention relates to a luminescent tube of a metal halide lamp. Background technique [0003] Recently, metal halide lamps using ceramic luminous tubes have higher efficiency, higher color rendering, and longer life than metal halide lamps using quartz luminous tubes, so they are mainly used as indoor lighting in shops and the like. to popularize. [0004] Figure 5 , Image 6 They are the structures of conventional metal halide lamps using ceramic luminous tubes. As the structure of the arc tube 28, the arc tube container 29 is composed of a discharge arc tube portion 30 made of a polycrystalline alumina ceramic material and a pair of thin tube portions 31, 32 sintered at both ends thereof. A pair of tungsten coil electrodes 33 and 34 are provided at both ends of the arc tube 28 . In addition, power supply bodies 35, 36 made of niobium or conductive cermets are hermetically sealed in the light-emitting tube thin tub...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J61/12
CPCH01J61/125
Inventor 东昌范西浦义晴织田重史榎并博司柿坂俊介
Owner PANASONIC CORP
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