Infrared objective system lens

Details Infrared objective system lens Infrared objective system lens

1983-06-22

1985-08-27

Arnold, Bruce Y.

350475, G02B 914, G02B 1314

Patent

active

045374643

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.

REFERENCES:
patent: 3160700 (1981-12-01), Snyder
patent: 3359066 (1967-12-01), Hutch et al.

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