Infrared halogen lamp with improved efficiency
AssigneeAdvanced Lighting Technologies, Inc.
InventorsAbbas Lamouri, Frederic Ahlgren, Juris Sulcs
Life of this patent
Estimating the term…
Abstract
Methods for improving the efficiency of infrared (IR) halogen lamps and IR halogen lamps having improved efficiency are disclosed. In a method of aligning a filament in a lamp body, the lamp body having the filament therein is rotated, and tubular end portions are heated and necked down which may assist in positioning the filament within the lamp and reduce end losses. IR halogen lamps formed from glass tubes having an OD less than 5 mm are also disclosed. The reduced diameter of the glass tubing increases the surface area for IR energy reflection and reduces end losses. Spuds or beads may be used to position the filament within the lamp.
Claims29
A method of aligning a filament in an electric lamp body, the method comprising:
- providing a lamp body of light transmissive material, the lamp body including a light emitting chamber intermediate first and second tubular end portions;
- providing a filament assembly comprising a refractory metal wire;
- positioning the filament assembly in the lamp body so that the wire extends from the light emitting chamber into each tubular end portion;
- rotating the lamp body about its longitudinal axis;
- heating a portion of the first tubular end portion;
- necking down the heated portion of the first tubular end portion;
- heating a portion of the second tubular end portion;
- and
- necking down the heated portion of the second tubular end portion.
A method of making an infrared (IR) halogen lamp, the method comprising:
- providing a lamp body of light transmissive material, the lamp body including a light emitting chamber intermediate first and second tubular end portions;
- coating the light emitting chamber with an IR reflective coating;
- providing a filament assembly comprising a refractory metal wire;
- positioning the filament assembly in the lamp body so that the wire extends from the light emitting chamber into each tubular end portion;
- rotating the lamp body about its longitudinal axis;
- heating a portion of the first tubular end portion;
- necking down the heated portion of the first tubular end portion;
- heating a portion of the second tubular end portion;
- necking down the heated portion of the second tubular end portion;
- sealing the end portions;
- and
- trimming the end portions to a specified length.
A double ended infrared (IR) halogen lamp comprising:
- a lamp body having a light emitting chamber intermediate sealed end portions;
- and
- a filament assembly having a mid portion positioned in said chamber and extending axially through each of said end portions;
- wherein said lamp body includes necked down portions proximate each axial end of said chamber.
A double ended infrared (IR) halogen lamp comprising:
- a lamp body having a light emitting chamber intermediate sealed tubular end portions, the end portions having an outside diameter of 4 mm or less and an inside diameter of 2 mm or less;
- and
- a filament assembly positioned in the lamp body.
A double ended infrared (IR) halogen lamp comprising:
- a lamp body having a light emitting chamber intermediate sealed tubular end portions;
- and
- a filament assembly including:
- a refractory metal wire positioned in said chamber and extending axially through each of said end portions;
- and
- a pair of beads, each bead ensheathing a portion of said wire extending in an end portion of said lamp body.
Dependencies are inferred from the claim text.