Method and means for improving the efficiency of light generation by an electrodeless fluorescent lamp
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 is described. 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 is 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%.
- Assignee:
- TIC; ERA-04-026861; EDB-79-042489
- Patent Number(s):
- US 4119889
- OSTI ID:
- 6492342
- Resource Relation:
- Patent File Date: Filed date 14 Feb 1977
- Country of Publication:
- United States
- Language:
- English
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