Infra-red lenses

Details Infra-red lenses Infra-red lenses

1975-02-10

1977-06-21

Corbin, John K.

350220, G02B 100, G02B 934

Patent

active

040308057

ABSTRACT:
An infra red lens of very high aperture greater than F/0.75 specially adapted to transmit a waveband in the infra red range comprises from front to back in the order given (a) at least one positive meniscus element convex towards the front, (b) a negative meniscus element concave towards the front, (c) a positive meniscus element convex towards the front and (d) a positive element having a front surface convex towards the front. In a preferred embodiment there is a single positive meniscus element (a) convex towards the front in front of the negative meniscus element (b) and in another embodiment there are two positive meniscus elements (a) convex towards the front in front of the negative meniscus element (b). The back element (d) which has a front surface convex towards the front may be a meniscus element or may be convex-plano or biconvex.

REFERENCES:
patent: 1967836 (1934-07-01), Merte
patent: 2684015 (1954-07-01), Grey
patent: 3321264 (1967-05-01), Sijgers et al.
patent: 3363962 (1968-01-01), Vogl

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