Incandescent lamp incorporating infrared-reflective coating system, and lighting fixture incorporating such a lamp
First Claim
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1. An incandescent lamp comprising:
- a filament that, when heated, emits visible light and infrared light;
an envelope enclosing the filament and including an inner surface facing toward the filament and an outer surface facing away from the filament; and
a coating system deposited on the envelope and includinga dielectric coating configured to transmit a substantial portion of visible light emitted by the filament and to reflect a substantial portion of infrared light emitted by the filament,a transparent conductive coating located on the side of the dielectric coating opposite the filament, wherein the transparent conductive coating is configured to transmit a substantial portion of visible light emitted by the filament and transmitted through the dielectric coating and further is configured to reflect a substantial portion of infrared light emitted by the filament and transmitted through the dielectric coating, andfirst and second oxygen diffusion barriers located on opposite sides of the transparent conductive coating, for preventing oxygen from reaching the transparent conductive coating, wherein the first and second oxygen diffusion barriers both comprise silicon nitride.
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Abstract
The present invention provides an improved lamp, and lighting fixture incorporating such a lamp, wherein the lamp'"'"'s envelope includes a special optical coating system configured to more effectively reflect infrared light back toward the lamp filament, thereby enhancing the lamp'"'"'s luminous efficacy. Multiple embodiments are disclosed, including coating systems deposited on one or both surfaces of the lamp envelope and including coating systems incorporating either a dielectric coating alone or specific combinations of a dielectric coating and a transparent conductive coating.
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Citations
33 Claims
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1. An incandescent lamp comprising:
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a filament that, when heated, emits visible light and infrared light; an envelope enclosing the filament and including an inner surface facing toward the filament and an outer surface facing away from the filament; and a coating system deposited on the envelope and including a dielectric coating configured to transmit a substantial portion of visible light emitted by the filament and to reflect a substantial portion of infrared light emitted by the filament, a transparent conductive coating located on the side of the dielectric coating opposite the filament, wherein the transparent conductive coating is configured to transmit a substantial portion of visible light emitted by the filament and transmitted through the dielectric coating and further is configured to reflect a substantial portion of infrared light emitted by the filament and transmitted through the dielectric coating, and first and second oxygen diffusion barriers located on opposite sides of the transparent conductive coating, for preventing oxygen from reaching the transparent conductive coating, wherein the first and second oxygen diffusion barriers both comprise silicon nitride. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A lighting fixture comprising:
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a housing; a concave reflector mounted on the housing; an electrical socket mounted in a prescribed position relative to the concave reflector; an incandescent lamp including a base configured to releasably seat in the electrical socket and to receive electrical power therefrom, a filament that, when heated, emits visible light and infrared light, an envelope secured to the base and cooperating with the base to enclose the filament, wherein the envelope includes an inner surface facing toward the filament and an outer surface facing away from the filament, and a coating system deposited onto the envelope and including a dielectric coating configured to transmit a substantial portion of visible light emitted by the filament and to reflect a substantial portion of infrared light emitted by the filament, a transparent conductive coating located on the side of the dielectric coating opposite the filament, wherein the transparent conductive coating is configured to transmit a substantial portion of visible light emitted by the filament and transmitted through the dielectric coating and further is configured to reflect a substantial portion of infrared light emitted by the filament and transmitted through the dielectric coating, and first and second oxygen diffusion barriers located on opposite sides of the transparent conductive coating, for preventing oxygen from reaching the transparent conductive coating, wherein the first and second oxygen diffusion barriers comprise silicon nitride. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification