Non-rotating electrodeless lamp containing molecular fill
AssigneeFusion Lighting, Inc.
InventorsYongzhang Leng, Brian P. Turner, James E. Simpson
Life of this patent
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Abstract
An electrodeless lamp includes a stationary bulb (10) containing a fill for producing a discharge, the fill has a primary radiating material which ordinarily produces an unstable discharge in the absence of bulb rotation. The fill further includes an alkali metal in an amount sufficient to stabilize the discharge without bulb rotation. The alkali metal may be, for example, cesium bromide. Preferably, the fill is excited by a non-stationary electric field (E, E1) such as, for example, a circular polarized electric field.
Claims26
An electrodeless lamp, comprising:
- a stationary bulb containing a fill for producing a discharge, the fill including a primary radiating material which would produce an unstable discharge in the absence of bulb rotation;
- a source of high frequency power;
- and
- a coupling structure for coupling the high frequency power to the fill,
- wherein the fill further includes an alkali metal in an amount sufficient to stabilize the discharge without bulb rotation.
An electrodeless lamp, comprising:
- a bulb containing a fill for producing a discharge;
- a source of microwave power;
- a first waveguide connected to the source of microwave power;
- a resonant cavity containing the bulb;
- and
- a second waveguide connected between the first waveguide and the resonant cavity, the second waveguide having a rectangular cross-section and a height configured to provide a non-stationary electric field in the resonant cavity.
An electrodeless lamp, comprising:
- a bulb containing a fill for producing a discharge;
- a source of microwave power;
- a waveguide connected to the source of microwave power, the waveguide including a coupling slot;
- a resonant cavity containing the bulb and connected to the waveguide for receiving microwave power from the coupling slot;
- and
- a dielectric material supported in the resonant cavity perpendicular to a plane of the coupling slot, wherein the dielectric material is configured to provide a different phase velocity to first and second orthogonal modes of electromagnetic radiation, respectively, such that the substantially ninety degrees phase difference between the two modes produces a rotating electric field in the resonant cavity.
An electrodeless lamp, comprising:
- a bulb containing a fill for producing a discharge;
- a source of microwave power;
- a waveguide connected to the source of microwave power;
- a resonant cavity containing the bulb;
- an air dielectric antenna disposed in the resonant cavity;
- and
- a feed conductor configured to couple the microwave power from the waveguide to the air dielectric antenna, and wherein the air dielectric antenna produces at respective edges thereof fringe electric fields having first and second orthogonal modes of radiation which combine to produce a circular polarized electric field in the resonant cavity.
An electrodeless lamp, comprising:
- a bulb containing a fill for producing a discharge;
- a source of high frequency power;
- a resonant cavity containing the bulb;
- a stripline antenna circuit configured to receive high frequency power and to provide a circular polarized field to the resonant cavity.
Dependencies are inferred from the claim text.