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High efficiency lamp or light accepter

  • US 5,055,892 A
  • Filed: 08/29/1989
  • Issued: 10/08/1991
  • Est. Priority Date: 08/29/1989
  • Status: Expired due to Term
First Claim
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1. An optical device comprising:

  • an axisymmetric cup having a closed end, reflective walls and a circular opening defined by a peripheral rim;

    a light energy transducer mounted in the closed end of the cup away from its opening; and

    a transparent medium having an index of refraction n filling the cup and extending beyond the opening of the cup, the medium forming a lens in the form of a spherical surface having a radius R, the center of curvature of the lens being located at a distance R/n from the rim of the cup opening, and the principal optical axis of the lens being coaxial with the cup.

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