Wavelength filtering coating for high temperature lamps
First Claim
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1. A lamp comprising:
- an envelope; and
a source of light energy enclosed therein;
wherein the envelope is a quartz or ceramic glass envelope, and bears a coating on the interior surface thereof, the coating comprising;
indium oxide, silicon, nitrogen, and at least one of tin oxide or zinc oxide; and
the coating exhibiting an initial crystal size at deposition of about 20 nm, and after exposure to a high temperature operating condition, exhibiting a crystal size of up to about 50 nm;
the coating operable to reflect UV and microwave light energy from the source of light energy back into the interior of the lamp and transmit visible light energy;
wherein the lamp is operable at said high temperatures of at least about 1150°
C.
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Abstract
The invention relates to a discharge lamp having a thin film indium oxide coating on the interior lamp envelope surface that effectively reflects UV, near IR and microwave radiation while transmitting light in the visible spectrum, the lamp being a high temperature operating lamp.
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Citations
12 Claims
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1. A lamp comprising:
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an envelope; and a source of light energy enclosed therein; wherein the envelope is a quartz or ceramic glass envelope, and bears a coating on the interior surface thereof, the coating comprising; indium oxide, silicon, nitrogen, and at least one of tin oxide or zinc oxide; and the coating exhibiting an initial crystal size at deposition of about 20 nm, and after exposure to a high temperature operating condition, exhibiting a crystal size of up to about 50 nm; the coating operable to reflect UV and microwave light energy from the source of light energy back into the interior of the lamp and transmit visible light energy; wherein the lamp is operable at said high temperatures of at least about 1150°
C. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification