Lens structure

Details Lens structure Lens structure

1975-05-06

1976-11-16

Corbin, John K.

350231, G02B 300

Patent

active

039920780

ABSTRACT:
An optical objective for the infra-red wave band, comprising front and rear simple positive lens elements each made of Germanium, said elements being axially spaced by a distance S lying between 0.8F and 1.2F, the rear surfaces of said elements being plane or convex to the front with radii of curvature greater than 10F and the front surface of each element being convex to the front with a radius of curvature less than the radius of curvature of its rear surface.

REFERENCES:
patent: 3034398 (1962-05-01), Barnes et al.
patent: 3778133 (1973-12-01), Tatian

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