Patent ID: 6621195
Filing Date: 2003-09-16
Classification: H01J

Abstract:
A spot light-source device excited by electromagnetic energy comprisinga lamp having a discharge envelope made of a translucent non-conducting material with an expansion part enclosing a discharge space, and a tube connected to the expansion part; a discharge concentrator having a front tip part supported by said tube without protruding from said discharge envelope and facing into the discharge space of said expansion part, said discharge concentrator being constructed to intensify concentration of an electric field in the discharge space and to concentrate discharge; an electromagnetic energy provision source that excites discharge in said discharge concentrator, said electromagnetic energy provision source being located outside of said lamp; a concave reflection mirror arranged for reflecting light emitted from said lamp; and a container with a resonance window that creates electromagnetic energy resonance; wherein said lamp and said concave reflection mirror are housed within said container; and wherein said container is constructed to prevent leakage of electromagnetic energy and has an aperture for collecting and emitting light from said lamp and concave reflection mirror.