Electric lamp with ellipsoidal shroud
First Claim
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1. An electric lamp comprising:
- a sealed light-transmissive lamp envelope having an interior space;
a light source capable of generating light within said envelope;
a shroud separate from said light source and in non-sealing communication with said light source and having a reflecting section disposed about said light source, said reflecting section being separated from said light source by a separating space;
a coating disposed on said reflecting section of said shroud for reflecting light having predetermined wavelengths emitted by said light source; and
wherein said reflecting section has an ellipsoidal shape effective for reflecting said light having predetermined wavelengths back substantially toward said light source and wherein said separating space is in fluid communication with said interior space of said envelope, said ellipsoidal shape of said reflecting section having a major longitudinal axis, said ellipsoidal shape being uniform such that if two halves of said ellipsoidal shape are defined by a plane in the middle of the reflecting section, said plane being perpendicular to said axis, said two halves will be mirror images of one another.
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Abstract
An electric lamp includes a sealed outer envelope, an arctube located within the envelope, a shroud separate from the arctube having an ellipsoidally-shaped reflecting portion positioned around the arctube, and a coating disposed on the reflecting section of the shroud for reflecting light having predetermined wavelengths emitted by the arctube. The ellipsoidal shape of the shroud is effective for reflecting the light substantially back toward the arctube. Particularly when the coating is a color correcting coating, the shape of the reflecting section is tailored to maximize reflection of radiation at selected wavelengths back toward the arc of the arctube.
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Citations
17 Claims
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1. An electric lamp comprising:
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a sealed light-transmissive lamp envelope having an interior space; a light source capable of generating light within said envelope; a shroud separate from said light source and in non-sealing communication with said light source and having a reflecting section disposed about said light source, said reflecting section being separated from said light source by a separating space; a coating disposed on said reflecting section of said shroud for reflecting light having predetermined wavelengths emitted by said light source; and wherein said reflecting section has an ellipsoidal shape effective for reflecting said light having predetermined wavelengths back substantially toward said light source and wherein said separating space is in fluid communication with said interior space of said envelope, said ellipsoidal shape of said reflecting section having a major longitudinal axis, said ellipsoidal shape being uniform such that if two halves of said ellipsoidal shape are defined by a plane in the middle of the reflecting section, said plane being perpendicular to said axis, said two halves will be mirror images of one another. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification