Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Induction-type discharge device load
Patent
1975-08-13
1977-03-01
Chatmon, Jr., Saxfield
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Induction-type discharge device load
313197, 315 39, 315267, 315283, 315344, H05B 4116, H05B 4124
Patent
active
040104001
ABSTRACT:
An electrodeless discharge lamp has an ionizable medium comprising a particular gas composition 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. The radio frequency is preferably between 3 megahertz and 300 megahertz. 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; radio frequency power at a frequency of about 4 megahertz is applied to the coil by an oscillator having a tuned circuit including the inductor and the discharge.
REFERENCES:
patent: 2030957 (1936-02-01), Bethenod et al.
patent: 2777966 (1957-01-01), Olmstead et al.
patent: 3500118 (1970-03-01), Anderson
patent: 3521120 (1970-07-01), Anderson
Chatmon, Jr. Saxfield
Hinderstein Philip M.
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