Mercury-free discharge lamp
AssigneeOsram Sylvania Inc.
InventorPhilip E. Moskowitz
Life of this patent
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Abstract
The present invention provides a low pressure metal halide fluorescent lamp. The metal halide fluorescent lamp may have an oblate spheroid cavity discharge vessel filled with an ionizable metal halide surrounding an exciter housing. An exciter within the exciter housing may drive the ionizable metal halide in an inductively coupled electrode-less manner. One or more embodiments may include one or more heat spreaders and/or thermal transfer pipes for transferring heat from the exciter to a surface of the oblate discharge vessel.
Claims19
A low pressure metal halide fluorescent lamp comprising:
- an oblate spheroid discharge vessel filled with an ionizable metal halide surrounding an exciter housing wherein the exciter provides an RF sinusoidal current producing a toroidal-shaped plasma in the oblate spheroid cavity discharge vessel;
- an exciter within the exciter housing for driving the ionizable metal halide in an inductively coupled electrode-less manner;
- and
- one or more heat transfer caps in contact with the exciter and an outer surface of the oblate spheroid discharge vessel.
A low pressure metal halide fluorescent lamp comprising:
- a discharge vessel filled with an ionizable metal halide surrounding an exciter housing;
- an exciter within the exciter housing for driving the ionizable metal halide in an inductively coupled electrode-less manner;
- and
- a top and bottom heat transfer cap in direct physical contact with the exciter and in direct physical contact with a polar region surface of the oblate spheroid discharge vessel wherein said polar region surface is not in direct physical contact with said exciter.
A low pressure metal halide fluorescent lamp comprising:
- an oblate spheroid cavity discharge vessel with a top polar region surface and a bottom polar region surface filled with an ionizable metal halide surrounding an exciter housing;
- an exciter within the exciter housing for driving the ionizable metal halide in an inductively coupled electrode-less manner;
- a top heat transfer cap in contact with said top polar region and a bottom heat transfer cap in contact with said bottom polar region, wherein the top and bottom heat transfer caps transfer heat from the exciter to said polar region surfaces of the oblate spheroid cavity discharge vessel by direct thermal conduction;
- and
- one or more thermal transfer pipes transferring heat from a core of the exciter to the top and the bottom heat transfer caps wherein the lamp is operated at 60 watts and maintains the entire oblate spheroid cavity discharge vessel surface at 110 C or greater.
Dependencies are inferred from the claim text.