Wavelength filtering coating for high temperature lamps

  • US 7,772,749 B2
  • Filed: 05/01/2007
  • Issued: 08/10/2010
  • Est. Priority Date: 05/01/2007
  • Status: Expired due to Fees
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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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