Patent ID: 6371627
Filing Date: 2002-04-16
Classification: H01J

Abstract:
A cold cathode tube comprising:a longitudinally extended tubular enclosure containing a predetermined gas concentration for emission of ultraviolet light responsive to an electrical discharge therein; an ultraviolet light reflective layer coated on a longitudinally extended interior surface of said tubular enclosure to form a closed cross-sectional contour; a visible light reflective layer coated on a portion of an exterior surface of said tubular enclosure, a longitudinally extended portion of said tubular enclosure being devoid of said visible light reflective layer to define a light emission portion of said tubular enclosure; and, a fluorescent material layer coated over a portion of said ultraviolet light reflective layer interior to said tubular enclosure, said light emission portion of said tubular enclosure being devoid of said fluorescent material layer.