Optical interference coatings and lamps using same
First Claim
1. An optical interference coating for reflecting infrared radiation and transmitting visible light radiation which comprises a plurality of alternating high and low refractive index layers, said coating having a spectrally broad high transmittance of at least about 90% average at a normal angle of incidence between about 400 to 770 nm, a spectrally broad high transmittance of at least about 90% average at about a 30 degree angle of incidence between about 400 to 700 nm and a spectrally broad high reflectance of at least about 70% average between about 800 to 1900 nm.
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Abstract
Optical interference coatings useful on lamps for transmitting visible light radiation at about 90% average from 400-770 nm and for reflecting infrared radiation comprise three spectrally adjacent multiperiod stacks of alternating high and low index of refraction layers. Compared to conventional filters, these filters have a greater tolerance to layer thickness variations incurred during manufacture with little or no color shift when viewed at non-normal angles.
60 Citations
43 Claims
- 1. An optical interference coating for reflecting infrared radiation and transmitting visible light radiation which comprises a plurality of alternating high and low refractive index layers, said coating having a spectrally broad high transmittance of at least about 90% average at a normal angle of incidence between about 400 to 770 nm, a spectrally broad high transmittance of at least about 90% average at about a 30 degree angle of incidence between about 400 to 700 nm and a spectrally broad high reflectance of at least about 70% average between about 800 to 1900 nm.
- 14. An electric lamp comprising a light transmissive envelope containing an electric light source within wherein at least a portion of said envelope is coated with an optical interference coating for reflecting infrared radiation and transmitting visible light radiation, said coating comprising a plurality of alternating high and low refractive index layers and having a spectrally broad high transmittance of at least about 90% average at a normal angle of incidence between about 400 to 770 nm, a spectrally broad high transmittance of at least about 90% average at about a 30 degree angle of incidence between about 400 to 700 nm and a spectrally broad high reflectance of at least about 70% average between about 800 to 1900 nm.
- 27. A tungsten halogen incandescent lamp comprising a vitreous, light transmissive envelope made of fused quartz having a filament chamber with a tungsten filament and at least one halogen hermetically enclosed within said chamber, wherein said filament has a longitudinal axis which is radially aligned along the optical center or axis of said chamber and wherein at least a portion of the exterior surface of said chamber is coated with an optical interference coating for reflecting infrared radiation and transmitting visible light radiation which comprises a plurality of alternating high and low refractive index layers, said coating having a spectrally broad high transmittance of at least about 90% average at a normal angle of incidence between 400 to 770 nm with no substantial portion of said transmittance in said 400-770 nm range being below about 80%, a spectrally broad high transmittance of at least about 90% average at about a 30 degree angle of incidence between about 400 to 700 nm and a spectrally broad high reflectance of at least about 70% average between about 800 to 1900 nm.
- 29. An optical interference coating for reflecting infrared radiation and transmitting visible light radiation which comprises a plurality of alternating high and low refractive index layers, said coating having a spectrally broad high transmittance of at least about 90% average at a normal angle of incidence over a range of 370 nm in the visible portion of the spectrum, a spectrally broad high transmittance of at least 90% average over a range of 300 nm in the visible spectrum at an angle of incidence of about 30 degrees and a spectrally broad high reflectance of at least about 70% average between about 800 to 1900 nm.
- 37. A tungsten halogen incandescent lamp comprising a vitreous, light transmissive envelope having a filament chamber with a tungsten filament and at least one halogen hermetically enclosed within said chamber, wherein said filament has a longitudinal axis which is radially aligned along the optical center of said chamber with at least a portion of the outer surface of said chamber coated with an optical interference coating for reflecting infrared radiation and transmitting visible light radiation, said coating comprising a plurality of alternating high and low refractive index layers and having a spectrally broad high transmittance of at least about 90% average at a normal angle of incidence over a range of 370 nm in the visible portion of the spectrum, a spectrally broad high transmittance of at least about 90% average at about a 30 degree angle of incidence between about 400 to 700 nm and a spectrally broad high reflectance of at least about 70% average between about 800 to 1900 nm.
Specification