Hot-cathode gas discharge long life lamp without filament

Abstract

The invention relates to a hot-cathode gas discharge long life lamp without a filament, which consists of a lighting tube 1, a cylindrical main electrode 2, a ferrite core 3, an induction coil 4, a thermistor 5, a starting circuit 6 and a high-frequency electronic ballast module 7. The hot-cathode gas discharge long life lamp without the filament utilizes the thermistor and electromagnetic oven heating principle to perform induction heating on the cylindrical cathode and emit elelctrons, and does not need the filament to save precious metal resources. The hot-cathode gas discharge long life lamp without the filament draws advantages of the conventional cold-cathode and filament electrode fluorescent lamps to make up for self shortages, has small potential drop of the cathode, less sputtering and evaporation loss, no trouble of filament breakage, difficult nigrescence at two ends of the lighting tube, energy saving and environmental protection, simple production process, available and cheap materials and enormous social and economic benefits, can obviously prolong the service life of the lighting tube and improve the photoelectric efficiency, and is suitable for mass production in low cost.

Description

technical field [0001] The invention relates to the field of electric light sources, in particular to daily energy-saving lighting for buildings, hotels and restaurants, workshops and offices of enterprises, institutions, schools and ordinary families, and more specifically, to a filament-free hot cathode gas discharge long-life lighting system. lamp. Background technique [0002] Lighting is an indispensable part of people's daily production and life. From primitive torches and oil lamps to various modern electric lights, it has been developing along with the progress of human society. Since Edison invented the electric light, using electricity to emit light has become the main lighting method in modern civilized society. Among all kinds of electric light sources, gas discharge lamps such as fluorescent lamps, energy-saving lamps, high and low pressure mercury lamps, sodium lamps, and metal halide lamps are currently the most widely used because of their good color, high l...

AI Technical Summary

Problems solved by technology

If the performance of the electronic ballast is not good enough and the heating of the filament is insufficient before starting, the electrode material will be evaporated and consumed quickly under the impact of ions, which will easily cause the ends of the lamp tube to become black, the filament will be burnt, and the light transmittance of the glass will drop significantly. , so that the luminous and energy-saving effects become worse, and the actual life of the lamp is greatly shortened, resulting in a serious mismatch between the life of the lamp and the life of the integrated electronic ballast, which not only wastes social resources, but also causes a lot of electronic waste and pollution when discarded. environment, which has become a common problem of traditional gas discharge lamps with filaments and energy-saving (fluorescent) lamps

Although the cold cathode fluorescent lamp without heating filament came out later, it requires a very high starting voltage, which complicates the driving circuit, increases the cost, and has a large cathode drop, which reduces the photoelectric conversion efficiency and safety of use.

Images