Radio frequency interference reduction arrangements for electrodeless discharge lamps
AssigneeDiablo Research Corporation
InventorsNickolas G. Vrionis, Roger Siao
Life of this patent
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Abstract
A cost-efficient electrically conductive screen and shield for substantially shielding radio frequency electromagnetic radiation emitted beyond the discharge vessel and the electronic circuitry of an electrodeless discharge lamp is disclosed. The conductive screen and/or shield is disposed outside the space occupied by the gaseous mixture and is grounded to the power supply. This shielding reduces the emission of electromagnetic radiation and, in particular, enables the discharge lamp to comply with FCC standards imposed with respect to the maximum admissible level of interference with wireless communication equipment such as radios and televisions.
Claims31
An electrodeless discharge lamp comprising:
- a discharge vessel sealed in a gas tight manner, said discharge vessel having an inner surface and an outer surface;
- a gaseous mixture disposed within said discharge vessel;
- means for generating an electromagnetic field for exciting said gaseous mixture, said excited gaseous mixture producing electromagnetic radiation, said means for generating comprising electronic components;
- and
- a shielding member, said shielding member comprising an electrically conductive shield at least partially enclosing said electronic components and an electrically conductive screen at least partially enclosing said discharge vessel, said shield and said screen being electrically joined together near a base of said discharge vessel.
An electrodeless discharge lamp comprising:
- a discharge vessel sealed in a gas tight manner, said discharge vessel having an inner surface and an outer surface;
- a gaseous mixture disposed within said discharge vessel;
- means for generating an electromagnetic field for exciting said gaseous mixture, said excited gaseous mixture producing electromagnetic radiation;
- and
- an electrically conductive screen disposed outside of said discharge vessel, wherein said conductive screen comprises a plurality of electrically conductive fingers.
An electrodeless discharge lamp comprising:
- a discharge vessel sealed in a gas tight manner, said discharge vessel having an inner surface and an outer surface;
- a gaseous mixture disposed within said discharge vessel;
- means for generating an electromagnetic field for exciting said gaseous mixture, said excited gaseous mixture producing electromagnetic radiation;
- an electrically conductive screen disposed outside of said discharge vessel;
- and
- an outer lamp envelope spaced away from said discharge vessel and substantially enclosing said discharge vessel, said lamp envelope having an inner surface and an outer surface.
An electrodeless discharge lamp comprising:
- a discharge vessel sealed in a gas tight manner, said discharge vessel having an inner surface and an outer surface, and being configured so as to form a cavity;
- a wall substantially enclosing said cavity, said wall having an inside surface and an outside surface;
- a gaseous mixture disposed within said discharge vessel;
- means for generating an electromagnetic field for exciting said gaseous mixture, said means for generating substantially disposed within said cavity, and said excited gaseous mixture producing electromagnetic radiation;
- and
- an electrically conductive screen substantially disposed inside said cavity.
An electrodeless discharge lamp comprising:
- a discharge vessel sealed in a gas tight manner, said discharge vessel having an inner surface and an outer surface;
- a gaseous mixture disposed within said discharge vessel;
- means for generating an electromagnetic field for exciting said gaseous mixture, said excited gaseous mixture producing electromagnetic radiation, said means for generating comprising electronic components;
- and
- a shielding member, said shielding member comprising an electrically conductive shield at least partially enclosing said electronic components and an electrically conductive screen disposed between the inner and the outer surface of said discharge vessel, said shield and said screen being electrically joined together near a base of said discharge vessel.
Method of reducing electromagnetic radiation from an electrodeless discharge lamp, said lamp comprising a discharge vessel sealed in a gas tight manner, said discharge vessel having an inner surface and an outer surface, a gaseous mixture disposed within said discharge vessel, means for generating an electromagnetic field for exciting said gaseous mixture, said means comprising electronic components, said excited gaseous mixture producing electromagnetic radiation, said method comprising substantially enclosing said lamp with a shielding member, said shielding member comprising an electrically conductive shield at least partially enclosing said electronic components and an electrically conductive screen at least partially enclosing said discharge vessel, said shield and said screen being electrically joined together near a base of said discharge vessel.
An electrodeless discharge lamp comprising:
- a discharge vessel sealed in a gas tight manner, said discharge vessel having an inner surface and an outer surface;
- a gaseous mixture disposed within said discharge vessel;
- means for generating an electromagnetic field for exciting said gaseous mixture, said excited gaseous mixture producing electromagnetic radiation;
- and
- an electrically conductive shield at least partially enclosing said generating means, wherein said conductive shield has a plurality of perforations.
An electrodeless discharge comprising:
- a discharge vessel sealed in a gas tight manner, said discharge vessel having an inner surface and an outer surface;
- a gaseous mixture disposed within said discharge vessel;
- means for generating an electromagnetic field for exciting said gaseous mixture, said excited gaseous mixture producing electromagnetic radiation;
- and
- an electrically conductive shield at least partially enclosing said generating means, wherein said conductive shield has a plurality of protrusions.
Dependencies are inferred from the claim text.