Low pressure discharge lamps with coated inner wires for improved lumen maintenance
AssigneeGeneral Electric Company
InventorJon Bennett Jansma
Life of this patent
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Abstract
Disclosed herein is a low pressure discharge lamp having a coating disposed upon at least a portion of inner lead-in wires, wherein the coating comprises refractory nanoparticles. Also disclosed herein, in particular, are fluorescent lamps having a coating disposed upon at least a portion of inner lead-in wires, the coating comprising refractory oxide nanoparticles having a median primary particle size of less than about 70 nm, with a thickness of from about 0.5 micrometer to about 10 micrometer. Disclosed advantages may include lessened end discoloration over the operational lifetime of the lamp, enhanced lumen maintenance, and inhibited mercury consumption.
Claims20
A low-pressure discharge lamp, comprising:
- light-transmissive envelope;
- fill gas composition capable of sustaining an electric discharge sealed inside the light-transmissive envelope, and one or more stem at least partially disposed within the envelope;
- spaced-apart lead-in wires extending from the one or more stem, and an electrode extending between said lead-in wires;
- a coating disposed upon at least a portion of said lead-in wires, said coating comprising refractory nanoparticles.
A fluorescent lamp, comprising:
- light-transmissive envelope;
- fill gas composition capable of sustaining an electric discharge sealed inside the light-transmissive envelope, and one or more stem at least partially disposed within the envelope;
- spaced-apart lead-in wires extending from the one or more stem, and an emissive electrode extending between said lead wires;
- a coating disposed upon at least a portion of said lead-in wires, said coating comprising refractory oxide nanoparticles,
- wherein the refractory oxide nanoparticles have a median primary particle size of less than about 70 nm, and wherein the coating has a thickness of from about 0.5 micrometer to about 10 micrometer.
A low-pressure discharge lamp, comprising:
- light-transmissive envelope;
- fill gas composition capable of sustaining an electric discharge sealed inside the light-transmissive envelope, and one or more stem at least partially disposed within the envelope;
- spaced-apart lead-in wires extending from the one or more stem, and an electrode extending between said lead-in wires;
- a coating disposed upon at least a portion of said lead-in wires, said coating consisting essentially of refractory nanoparticles.
A low-pressure discharge lamp, comprising:
- light-transmissive envelope;
- fill gas composition capable of sustaining an electric discharge sealed inside the light-transmissive envelope, and one or more stem at least partially disposed within the envelope;
- spaced-apart lead-in wires extending from the one or more stem, and an electrode extending between said lead-in wires;
- a coating disposed upon at least a portion of said lead-in wires, said coating comprising refractory nanoparticles, wherein said coating has been disposed by applying a solution or sol suspension of refractory nanoparticles to at least a portion of said lead-in wires.
Dependencies are inferred from the claim text.