Wide-angle seven-element lens system

Details Wide-angle seven-element lens system Wide-angle seven-element lens system

1987-05-04

1988-05-31

Corbin, John K.

350458, G02B 1304, G02B 964

Patent

active

047476761

ABSTRACT:
A wide-angle lens system of the seven-unit-seven-element configuration. Arranged in ordered from the object side are two opposed negative meniscus lenses, two opposed positive lenses, a negative lens and two lens with opposed convex surfaces. Four required and one optional numerical conditions are imposed on the focal length, radius of curvature, Abbe numbers and refractive indices.

REFERENCES:
patent: 4046459 (1977-09-01), Kawamura
patent: 4143945 (1979-03-01), Kubota

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