Patent ID: 8648520

Claim:
An inner coupling tubular type electrodeless lamp comprising a glass bulb, an amalgam, and a power coupler; said glass bulb including an external portion and an inner portion; a gas discharging cavity that is annularly airtight being defined by an envelopment of said external portion and said inner portion; a coupling cavity being defined in said inner portion; said power coupler including a radiating post, a ferrite core, and a winding sequentially situating from an interior to an exterior thereof; said power coupler being disposed in said coupling cavity; two ends of said coupling cavity being intercommunicated with each other as well as communicated with the exterior; said external portion of said glass bulb adopting an elongated tube; characterized in that a length of said ferrite core of said power coupler is not smaller than a half length of said coupling cavity; a length of said winding is measured from one-fifth to four-fifth of said length of said coupling cavity to evenly distribute an electromagnetic field; at least one diffuse reflection layer that is made of a material falling in a 250˜2000 nm spectrum scope being disposed between an inner wall of said inner portion and an external surface of said power coupler, said material for making said diffuse reflection layer adopting a non-conducting electricity material that resists a temperature higher than 100° C.