Method and means for improving the efficiency of light generatio

Details Method and means for improving the efficiency of light generatio Method and means for improving the efficiency of light generatio

1977-02-14

1978-10-10

Chatmon, Jr., Saxfield

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Induction-type discharge device load

313116, 315 39, 315344, H05B 4116, H05B 4124

Patent

active

041198891

ABSTRACT:
In an electrodeless fluorescent lamp of the type including a sealed, light transmissive, envelope including an elongate inner wall defining an open-ended cavity and an outer wall surrounding the inner wall to form a generally annular, hollow cavity therebetween, the annular cavity being charged with an ionizable gaseous medium, an induction coil positioned within the open-ended cavity, and a radio frequency oscillator connected to the coil, the coil and the oscillator initiating and maintaining ionization of the medium to form an ultraviolet light emitting discharge, the inner surface of the outer wall of the envelope being coated with a phosphor which emits visible light when excited by ultraviolet light, the improvement wherein the outer surface of the inner wall is coated with a layer of an electrically insulative ultraviolet light reflective material which is overcoated with a phosphor layer. Such improvement yields an increase in visible light production of the order of 50% to 100%.

REFERENCES:
patent: 3225241 (1965-12-01), Spencer et al.
patent: 3521120 (1970-07-01), Anderson
patent: 3987331 (1976-10-01), Schreurs

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