High intensity discharge lamp with enhanced dimming characteristcs
AssigneeGeneral Electric Company
InventorsÁgoston Böröczki, Csaba Horváth
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Abstract
A high intensity discharge lamp comprises a discharge vessel and two electrode rods having substantially flat ends facing to each other in opposite positions within the discharge vessel. A spiral coil of wire is wound at least on a part of the surface of at least one of the electrode rods. The spiral coil protrudes over said end of the corresponding electrode rod and thus forms a hollow cavity for extending dimmable wattage range of the lamp.
Claims20
A method for manufacturing an electrode for high intensity discharge lamps having an electrode rod including a substantially flat end, a spiral coil of wire wound at least on a part of the surface of the electrode rod, the spiral coil having first and second layers protruding over said end of the electrode rod and thus forming a vacant, hollow cavity extending from the substantially flat end of the electrode rod comprising:
- winding turns of at least one spiral coil layer of wire onto the surface of the electrode rod, the spiral coil layers protruding over said end of the electrode rod and thus forming the vacant, hollow cavity,
- positioning at least a portion of the first layer to extend axially beyond the substantially flat end of the electrode rod,
- further positioning the outer, second layer radially overlapping at least part of the first layer and radially overlapping at least part of the electrode rod, and at least a portion of the second layer extending axially beyond the substantially flat end of the electrode rod, and
- pressing the spiral coil layers and the turns thereof together to enhance electrical and mechanical contact between neighboring turns of the spiral coil layers.
Dependencies are inferred from the claim text.