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Electric lamp with ellipsoidal shroud

  • US 5,610,469 A
  • Filed: 03/16/1995
  • Issued: 03/11/1997
  • Est. Priority Date: 03/16/1995
  • Status: Expired due to Fees
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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