Method and apparatus to reduce Hg loss in rf capacitively couple

Details Method and apparatus to reduce Hg loss in rf capacitively couple Method and apparatus to reduce Hg loss in rf capacitively couple

1991-06-18

1992-09-08

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Induction-type discharge device load

315 39, H05B 4116

Patent

active

051461404

ABSTRACT:
A method and apparatus which prevent mercury and fill gas loss in capacitively coupled electrodeless lamps operated at low frequencies (below 100 MHz). The lamp includes a lamp envelope with an inner coating of phosphor. Outer electrodes coupled to a radio frequency source are positioned around the outer surface of the lamp envelope. The lamp contains a fill gas (e.g. mercury and argon) which forms a plasma causing UV radiation which excites the phosphor. Mercury loss is prevented by providing a pair of inner conductors aligned with the outer conductors but electrically insulated therefrom. The inner conductors prevent the mercury and fill gas ions from embedding themselves in the lamp envelope.

REFERENCES:
patent: 4223250 (1980-09-01), Kramer
patent: 4266166 (1981-05-01), Proud
patent: 4798997 (1989-01-01), Egami

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