Ceramic discharge container and metal halide lamp

Abstract

A discharging ceramic container, comprising a discharging main tube and two capillaries (2) connected to the two ends of the discharging main tube, one electrode (5) being provided in each of the capillaries (2). The discharging main tube comprises a bulged section (3) in the middle and cylindrical sections (1) at the two ends, and the bulged section (3) is smoothly connected to the cylindrical sections (1). The bottom of the bulged section (3) is flush with the cylindrical section (1), and the top of the bulged section (3) is higher than the top of the cylindrical sections (1). The discharging ceramic container has an asymmetric discharging cavity (4), which guarantees good electro-optical parameters while effectively avoids overheating at the middle part of the upper tube wall of the discharging cavity (4) during ignition, thereby eliminating the deformation of the tube wall and improving the reliability and safety thereof. Also disclosed is a metal halide lamp made from the discharging ceramic container.

Description

technical field [0001] The invention designs a high-intensity discharge lamp, in particular to a ceramic discharge vessel and a metal halide lamp made of it. Background technique [0002] Due to the ever-increasing need for energy-efficient lighting systems, metal halide lamps with ceramic discharge vessels are increasingly used for interior and exterior lighting. As is known, such lamps comprise a ceramic discharge vessel, usually a symmetrical body of revolution such as a cylinder, sphere or ellipsoid, in which a pair of electrodes is arranged. [0003] Chinese patent CN101436516A discloses a ceramic discharge tube metal halide lamp. Ceramic discharge tube metal halide lamp forms a discharge cavity in the discharge tube. The discharge cavity is filled with inert gas (such as xenon Xe) and ionizable salt. A pair of electrodes are placed in the discharge cavity and are located at both ends of the ceramic discharge tube. The two electrodes The tips are spaced apart to form ...

AI Technical Summary

Problems solved by technology

First of all, the inner diameter of the slender ceramic tube is small, and the load on the tube wall is large. When the horizontal ignition is ignited, the bending of the arc will make the temperature of the central part of the upper tube wall of the discharge chamber too high, thereby causing the denaturation of the tube wall of the ceramic tube body, which is serious. It will cause breakage and affect the reliability and safety of the product

[0005] The fillers in metal halide lamps commonly used at present are generally metal halide series containing rare earth metals such as DyI3, HoI3, TmI3, etc. Although these metal halides can make the lamp have superior color rendering, but because these metal halides It is very corrosive at high temperature, which will affect the luminous flux maintenance rate and ignition life of the light source, so it is not the most suitable filler choice

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