Patent ID: 6433478
Filing Date: 2002-08-13
Classification: H01J,Y02B

Abstract:
An electrodeless fluorescent lamp comprising:a bulbous glass envelope with a reentrant cavity in said envelope having an inert gas and a vaporizable metal material in said envelope, and a phosphor coating on the inner surface of walls of said envelope and said reentrant cavity; a hollow enclosure affixed to the bottom of said envelope at one end of said enclosure and to an Edison base at another end thereof; induction coil disposed in said reentrant cavity, said coil for generating an electromagnetic field to form a plasma in said envelope to produce radiation to excite said phosphor to thereby provide visible light; a ferrite unit including MnZn material in and adjacent to said reentrant cavity and said induction coil; a cooling structure having a metal tube inside a portion of said ferrite unit and a heat transmitting unit adjacent said tube positioned inside said enclosure and said Edison base to transmit heat from said ferrite unit to said Edison base; an insulation unit separating said ferrite unit from at least a portion of said enclosure; and a lamp driver and a matching network located inside said enclosure.