Low pressure arc discharge light source unit

Details Low pressure arc discharge light source unit Low pressure arc discharge light source unit

H - Electricity

01

J

313/80

H01J 61/30 (2006.01) H01J 61/72 (2006.01) H01J 61/94 (2006.01)

Patent

CA 1288129

A b s t r a c t In a low pressure arc discharge light source unit for unipolar or bipolar operation comprising a vacuum- tight glass envelope (1) translucent at at least one side thereof, a rare fill gas and a quantity of mercury therein, a coating of fluorescent phosphor on the inner side of the envelope, and at least two electrodes opposed to each other within the envelope and connected to lead-in wires or the like, the envelope (1) is flat and essentially two-dimensional comprising two planar areas essentially parallel to each other at a small distance. The unit provides for better light output, better radiation efficacy and simpler and less costly manufacture, at the same time being more compact. At least 50 % of the radiation of the planar area of the front of the envelope (1) is effective. Means are provided allowing a single cathode to cooperate with a multiplicity of anodes in e.g. a pixel.

522935

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