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Infrared zoom lens assembly having a variable F/number

  • US 5,796,514 A
  • Filed: 01/23/1997
  • Issued: 08/18/1998
  • Est. Priority Date: 03/04/1996
  • Status: Expired due to Fees
First Claim
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1. An infrared zoom lens assembly, comprising:

  • a focusing component located along an optical axis to receive infrared radiation, the focusing component comprising a first and a second focusing zoom lens formed from a high dispersion, low index material;

    a collecting component located along the optical axis in optical communication with the focusing component, the collecting component comprising at least one collecting lens formed from the high dispersion, low index material;

    an aperture stop movably mounted along the optical axis;

    a diffracting component located along the optical axis and in optical communication with the focusing and collecting components, the diffracting component comprising at least one diffractive surface to correct color aberrations associated with an infrared waveband; and

    the focusing and collecting components cooperating with the diffracting component to focus infrared radiation at an image plane of an infrared detector.

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