Patent ID: 6472641
Filing Date: 2002-10-29
Classification: F21V,F21W

Abstract:
A lamp unit for a light radiating type heating device comprising:a first group of lamps comprising a plurality of filament lamps, wherein each filament lamp has a light emitting tube arranged in a first plane and wherein said filament lamps are arranged such that their light emitting tubes form concentric circles having different diameters; and a second group of lamps comprising a plurality of filament lamps, wherein each filament lamp has a light emitting tube arranged in a second plane and wherein said filament lamps are arranged such that their light emitting tubes form concentric circles having different diameters, wherein said first plurality of filament lamps and said second plurality of filament lamps are arranged in a staggered manner having coincident centers; and a mirror for reflecting light emitted from said filament lamps, said mirror comprising grooves wherein the light emitting tubes of the filament lamps of the first group of lamps are arranged, and wherein the grooves are defined by side walls protruding from said mirror in the direction of the light emitting tubes of the filament lamps of the second group of lamps.