Infrared objective system lens
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United States of America Patent
Stats
-
Aug 27, 1985
Grant Date -
N/A
app pub date -
Jun 22, 1983
filing date -
Jun 25, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
This invention provides an infrared lens system for the wavelength range of 3.5 .mu.m-5 .mu.m of F/1 and having an angle of field of 3.2.degree.. The lens system consists of three lens elements. As viewed from the object side the first element is a positive lens (1) made of silicon (Si), the second element (3) is made of calcium fluoride (CaF.sub.2) and the third is a positive lens (2) made of silicon (Si). This lens system is intended for use in a thermal imaging device, having a scanning mirror (4) and a radiation detector (5) with a sapphire cover (6). Thus a low cost achromatic infrared objective system is provided.
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