Afocal telescopes
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United States of America Patent
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Apr 11, 2000
Grant Date -
N/A
app pub date -
May 3, 1999
filing date -
May 8, 1998
priority date (Note) -
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Abstract
An afocal telescope operating in the thermal infra-red waveband has a three-element objective comprising a positively-powered central lens element disposed between positively powered and negatively powered lateral lens elements, the positively powered lateral lens element being located proximal to the inter-mediate image and incorporating a hybrid surface simultaneously to correct longitudinal and field colour, and wherein one of the positively powered lens elements of the objective is made of a material having a negative temperature refractive index co-efficient and has an optical power selected to render the telescope athermal.
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