Arc tube of ceramic metal halide lamp
A technology of ceramic metal and halide lamps, which is applied in the field of electric light sources, can solve problems such as deterioration of start-up characteristics and life, loss of luminescent substances, limited use and promotion, etc., to achieve less heat radiation energy loss, increase cold end temperature, and ensure airtightness The effect of connection
Inactive Publication Date: 2008-10-01
FUDAN UNIV
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Problems solved by technology
At the operating temperature of the lamp, due to certain chemical processes between the quartz and the filled metal halides and the leakage of alkali metal ions, the loss of luminescent substances and the excess of halogens
The existence of the above phenomenon makes the light color stability, light output maintenance, start-up characteristics and life of the quartz metal halide lamp significantly deteriorated, thus limiting the use and promotion of the lamp
Method used
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[0012] Such as figure 1 The arc tube of a 250-watt ceramic metal halide lamp with the structure shown has a translucent polycrystalline alumina ceramic tube 1 with an inner cavity diameter of 9.6±0.2mm, a wall thickness of 1.5±0.1mm, and a length of 46±0.5mm. The tops of the ceramic plugs 2 and 3 are conical, with a taper of 50°±2°; the inner diameter of the center hole 7 of the ceramic plug is 2±0.1 mm, and the total length is 16±0.5 mm, of which the length extending into the ceramic tube 1 is 8 ±0.2mm, the outer diameter of the tail pipe 5 is 4±0.1mm. Use rare earth oxide glass solder 8 to complete hermetic connection with the molybdenum rod (wire) part of the electrode assembly, and fill the interior with 15 ± 0.5g of metal halides such as Dy, Ho, Tm, Tl and Cs, and 23 ± 0.5g of mercury. and Kr 85 The mixed gas with Ar is 5KPa, the total length of the arc tube is 62±1mm, and the arc length is 30±0.5mm. The color temperature of the lamp is 5500±200K, the color rendering i...
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Abstract
Discharge cavity of the arc tube is prepared by sintering straight tube typed ceramic tube of polycrystal alumina and ceramic plugs at two ends of tube integrally. Inner side at top part in shape of taper or cone, which is extended into discharge tube, can raise light effect and color-rendering index. Back end part of ceramic plug through a conical transition tube is connected to a slim tube with a small hole in center. Through mode of glass solder, a pair of electrode is extended into the slim tube to realize hermetic seal with ceramics cavity. Start-up gas, mercury, and some metal halides required by different spectrum are filled in discharge tube. It is evident that photoelectric properties of the disclosed metal halide lamp are over properties of the quartz metal halide lamp. The invention is suitable to production of ceramic metal halide lamp in middle and large power specially.
Description
technical field [0001] The invention belongs to the technical field of electric light sources, and in particular relates to an arc tube structure of a metal halide lamp. Background technique [0002] Metal halide lamps usually use quartz as the arc tube material for metal halide lamps. At the working temperature of the lamp, due to some chemical processes between the quartz and the filled metal halides and the leakage of alkali metal ions, the loss of luminescent substances and the excess of halogens are caused. The existence of the above phenomenon makes the light color stability, light output maintenance, start-up characteristics and life of the quartz metal halide lamp significantly deteriorated, thereby limiting the use and promotion of the lamp. [0003] Polycrystalline alumina ceramics have good chemical stability, and they do not undergo significant chemical processes with metal halides at high temperatures. Metal halide lamps made of translucent alumina ceramic tub...
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IPC IPC(8): H01J61/12H01J61/36H01J61/30H01J61/00
Inventor 诸定昌施振家
Owner FUDAN UNIV