Looking for a life long high efficiency light source is the long-term pursuit, in the energy crisis first today, it has become more urgent, electrodeless fluorescent lamp is consistent with the development trend of the source. With the world of electrodeless fluorescent lamp in-depth study and raising the level of technology, there are more typical products, but also its application fields has been constantly pioneering [1]. The electrodeless lamp in the country vigorously promote energy-saving emission reduction situation got rapid development, technology is relatively mature, according to incomplete statistics, at present our country electrodeless fluorescent lamp manufacturer has more than 200, the annual output more than 2000000, the application range of the product is more and more far sold around the world. In this paper, we carry out research and development work in this area of the electrodeless lamp preliminary understanding to discuss and exchange with you.

Electrodeless fluorescent lamp development can be traced back to nineteenth Century, W. Hittorf and J.J. Thomoson respectively in 1884 and 1891 on radio frequency induction discharge principle, pointed out that the electrodeless discharge plasma by induction coil electromagnetic field maintenance, and began using a transformer model to explain the energy coupling [2]. In 1891 the physicist N. Tesla of the Columbia University at New York demonstrated the first by the RF field excitation of the electrodeless discharge [3]. He was employing low frequency capacitive discharge, can be in only a very short intervals produce weak discharge, but out of the electrodeless discharge important first by the RF field excitation of the electrodeless discharge [3]. He was employing low frequency capacitive discharge, can be in only a very short intervals produce weak discharge, but out of the electrodeless discharge is an important first step. The earliest electrodeless lamp patent in 1907 by P.C.Hewitt [4], as shown in Figure 1, the discharge structure with today's ICP discharge device similar to. Discharge structure includes a spherical bubble shell is filled with small amounts of mercury and in spherical bubble shell outside surrounded by a coil,dab5d56ck as there was no high-frequency electronic equipment, discharge of the driving frequency of 125 - 300Hz. Hewitt laid the RF electrodeless discharge structure of the foundation, for the later development of electrodeless lamp provided vital design ideas.

Subsequently many scientific workers to electrodeless discharge light sources for research and exploration, of which there are two important patents, was 1936 respectively J. Bethenod[5] and A. Claude[6] proposed patent and 1970 J.M. Anderson's patent. J. Bethenod and A. Claude proposed patent as shown in Figure 2, the bulb shell structure adopts a cavity structure, the cavity into the coil and the magnetic core. This structure in the present electrodeless fluorescent lamp has also been widely used, the utility model has the advantages of compact structure is discharge, the induction coil can block the light, radio frequency radiation can be plasma shield as well as structure convenient processing. In 1970 Anderson proposed external induction coil structure,as shown in Figure 3, the discharge structure adopts an annular sealed blister, blister induction coil is placed in the outside. At present this kind of structure discharge start easily and can well solve the problem of heat dissipation, the requirement of materials can be reduced, can achieve high power discharge, and the discharge performance is more stable, higher light efficiency.

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