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Imaging lens for infrared cameras

  • US 7,474,477 B2
  • Filed: 09/01/2006
  • Issued: 01/06/2009
  • Est. Priority Date: 10/07/2002
  • Status: Expired due to Term
First Claim
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1. An infrared imaging device, comprising:

  • first and second plastic Fresnel lens elements in optical communication with each other;

    wherein said first lens element has positive power and said second lens element also has positive power, and wherein said first lens element is adapted to mimic a meniscus asphere correct for conjugates of infinity and for the focal length of said first lens element.

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