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Light fixture having a multilayer polymeric film

  • US 6,685,341 B2
  • Filed: 05/21/2002
  • Issued: 02/03/2004
  • Est. Priority Date: 04/06/1994
  • Status: Expired due to Fees
First Claim
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1. A light-emitting apparatus, comprising in combination:

  • a light source; and

    a multilayer mirror wrapped partially around the light source, the multilayer mirror comprising alternating layers of at least a first layer type comprising a first polymeric material and a second layer type comprising a second polymeric material, wherein a difference in indices of refraction between the two layer types is Δ

    x along a first in-plane axis, Δ

    y along a second in-plane axis perpendicular to the first in-plane axis, and Δ

    z along a third axis mutually orthogonal to the first and second axes, and wherein |Δ

    z| is less than about 0.5 k, where k is the larger of |Δ

    x| and |Δ

    y|.

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