High efficiency tubular heat lamps
First Claim
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1. A lamp for transmitting a desired portion of the radiation specturm for impinging onto a selected medium and inhibiting transmission of an unwanted portion of the radiation spectrum, said lamp comprising:
- a single radiation transmissive envelope containing a filling of inert gas and a relatively small quantity of a halogen gas;
a tungsten filament for emitting radiation wavelengths in both the visible and infrared portions of the radiation spectrum, said filament being housing within and in close proximity to the walls of said envelope;
a reflective film on the outer surface of said envelope and effective to withstand an operating temperature of about 950°
C., and to filter the radiation to be transmitted through said envelope;
said film comprising a plurality of stacks of layers of high and low indices refractory material and effective to establish a pass-band characteristic, and a stop-band characteristic both for the portion of radiation to be transmitted through said envelope, said pass-band and said stop-band characteristics being predeterminedly selected for said medium desired to be impinged by the radiation to be transmitted;
through said envelope; and
each of said stacks of layers consisting of a first, a second and then a third stack, said first, second and third stacks each consisting of layers of high index refractory material of predetermined thicknesses within ranges in nanometers of 83 to 137, 265 to 372, and 207 to 366 respectively and said stacks further having layers of low index refractory material of predetermined thicknesses within the ranges in nanometers of 142 to 207, 142 to 219, and 190 to 245, respectively.
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Accused Products
Abstract
A lamp adapted to various residential, commercial and industrial needs by a reflective film is disclosed. The disclosed lamp having the reflective film transmits desired portions of the radiation spectrum selected for impinging onto various mediums. Also disclosed are various arrangements of the reflective film along with various desired film characteristics selected for various mediums to be impinged.
42 Citations
7 Claims
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1. A lamp for transmitting a desired portion of the radiation specturm for impinging onto a selected medium and inhibiting transmission of an unwanted portion of the radiation spectrum, said lamp comprising:
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a single radiation transmissive envelope containing a filling of inert gas and a relatively small quantity of a halogen gas; a tungsten filament for emitting radiation wavelengths in both the visible and infrared portions of the radiation spectrum, said filament being housing within and in close proximity to the walls of said envelope; a reflective film on the outer surface of said envelope and effective to withstand an operating temperature of about 950°
C., and to filter the radiation to be transmitted through said envelope;said film comprising a plurality of stacks of layers of high and low indices refractory material and effective to establish a pass-band characteristic, and a stop-band characteristic both for the portion of radiation to be transmitted through said envelope, said pass-band and said stop-band characteristics being predeterminedly selected for said medium desired to be impinged by the radiation to be transmitted;
through said envelope; andeach of said stacks of layers consisting of a first, a second and then a third stack, said first, second and third stacks each consisting of layers of high index refractory material of predetermined thicknesses within ranges in nanometers of 83 to 137, 265 to 372, and 207 to 366 respectively and said stacks further having layers of low index refractory material of predetermined thicknesses within the ranges in nanometers of 142 to 207, 142 to 219, and 190 to 245, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification