Symmetrical type four-component lens system

Details Symmetrical type four-component lens system Symmetrical type four-component lens system

1974-03-04

1976-03-02

Corbin, John K.

350177, G02B 934

Patent

active

039414574

ABSTRACT:
A symmetrical type four-component lens system comprises, in the direction of incidence of light, a first lens component, a second lens component, a stop, a third lens component and a fourth lens component. Each lens component is a combination of a positive and a negative lens element, the concave surface of each element facing the stop. The surfaces of the first and fourth components facing the stop have shorter radii of curvature than the surfaces of the second and third components facing away from the stop. The first and fourth components have greater focal lengths than the second and third components. The second and third components satisfy certain conditions relating to the materials forming them.

REFERENCES:
patent: 2713809 (1955-07-01), Cook
patent: 3672748 (1972-06-01), Doi et al.

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