H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/28, 313/80
H05B 41/24 (2006.01) H01J 65/04 (2006.01)
Patent
CA 1070751
ABSTRACT OF THE DISCLOSURE This invention relates to electrodeless discharges and, more particularly, to improving the conversion efficiency of electrical power to light by means of an electrodeless discharge. In the common incandescent lamp, the light emitting filament evaporates and becomes weak with use, hence is easily fractured or dislodged from its supports. More importantly, the efficiency of an incandescent lamp in converting electrical power to light is very low. Fluorescent lamps are generally more efficient and durable than incandescent lamps, but they require both a ballast supply and a special fixture which must be installed before a lamp can be used. Further, the electrodes are subject to disintegration over a period of time. the present invention overcomes these deficiencies by providing an electrodeless discharge lamp having an inonizable medium comprising a particular gas composi- tion at a particular pressure within a sealed envelope. Radio frequency electrical power is applied to an induction coil, the magnetic induction field of which is coupled to the medium. for a particular radio frequency, the magnitude of the induction field is selected to maximize the light emitted by the discharge per watt of radio frequency power coupled thereto. In one embodiment, a mixture of mercury vapor and argon is contained within an envelope having an open cylindrical cavity into which the coil fits; the portion of the interior surface of the envelope defining the cavity has a layer of an electrically insulative, ultraviolet reflective material, and the entire interior surface of the envelope has a phosphor layer.
258954
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