Dual cathode beam mode fluorescent lamp

Details Dual cathode beam mode fluorescent lamp Dual cathode beam mode fluorescent lamp

H - Electricity

01

J

313/80

H01J 61/92 (2006.01) H01J 61/72 (2006.01) H01J 63/00 (2006.01)

Patent

CA 1190588

DUAL CATHODE BEAM MODE FLUORESCENT LAMP ABSTRACT OF THE INVENTION The lamp shown herein is a beam mode fluorescent lamp for general lighting applications. The lamp com- prises a light transmitting envelope, having a phosphor coating on its inner surface, enclosing a pair of therm- ionic electrodes and a fill material, such as mercury, which emits ultraviolet radiation upon excitation. During application of the first polarity of an AC signal, one electrode acts as a cathode and the other electrode functions as an anode. During the other AC polarity, the electrodes reverse their functions. This invention re- duces the requirement for input power to a beam mode dis- charge lamp without adversely affecting luminous output. This lamp substantially eliminates wasted electron bom- bardment energy to the anode by use of this energy to help heat the cathode for the next half of the AC cycle. This lamp employs a single power source and may be used in various pre-heat or rapid start configurations.

417466

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