Collimation lens system

Details Collimation lens system Collimation lens system

1981-03-19

1983-08-16

Henry, Jon W.

350 12, 350566, 350410, 350474, G02B 102, G02B 2300, G02B 912, G02B 2500

Patent

active

043987869

ABSTRACT:
An eyepiece or collimation lens system (22) is formed by three optically-powered lens elements (A, B, C) aligned on a common optical axis (23) and arranged to accept radiation in the infrared wavelength region from a real image (I) and provide a bundle of parallel rays at an exit pupil (.0.), each of the lens elements (A, B, C) is positively powered and made of a material which has a useful spectral bandpass in the infrared wavelength region and the refractive surface (6) of lens element (C) which lies adjacent the real image (I) is flat whereas the other refractive surfaces, (1, 2, 3, 4, 5) of the lens elements (A, B, C) are substantially spherical. A graticule may be mounted on or adjacent the flat refractive surface (6) and each refractive surface may be anti-reflection coated. Conveniently lens element (c) is made of zinc selenide whereas lens elements (A, B) are each made of germanium.

REFERENCES:
patent: 2393782 (1946-01-01), Kingslake et al.
patent: 2949056 (1960-08-01), Loeck
patent: 3888567 (1975-06-01), Shoemaker
patent: 4199217 (1980-04-01), Rogers

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