Wide angle zoom lens of two-group construction

Details Wide angle zoom lens of two-group construction Wide angle zoom lens of two-group construction

1980-05-27

1983-04-19

Corbin, John K.

G02B 1514

Patent

active

043803750

ABSTRACT:
A wide angle zoom lens system comprises a forward group which is a divergent lens group, and a rearward group which is a convergent lens group. The divergent lens group includes, in succession from the object side, at least two negative meniscus lenses having their convex surfaces facing the object side and only one positive meniscus lens having its convex surface facing the object side. The convergent lens group has, in succession from the object side, a biconvex positive lens having its surface of sharper curvature facing the object side, a single or doublet positive lens having its surface of sharper curvature facing the object side, a biconcave negative lens having its surface of sharper curvature facing the image side, a positive meniscus lens having its convex surface facing the image side, and a positive meniscus lens having its convex surface facing the object side. The lens system satisfies predetermined conditions.

REFERENCES:
patent: 4074931 (1978-02-01), Okudaira
patent: 4155629 (1979-05-01), Nakamura
patent: 4266860 (1981-05-01), Hayashi

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