Compact zoom objective

Details Compact zoom objective Compact zoom objective

1980-06-02

1983-01-18

Corbin, John K.

G02B 1518

Patent

active

043689540

ABSTRACT:
The compact zoom objective disclosed includes, from front to rear, a first lens group having positive power, a second lens group of negative power, a third lens group of positive power for collimating incident rays of light, and a fourth lens group of positive power. The fourth lens group is composed of a positive first lens of convex forward surface, a negative second lens of concave forward surface, a positive third lens, a biconvex and a positive fourth lens, and a negative fifth lens of concave forward surface arranged in this order from the front, and being characterized by fulfilling the following conditions:

REFERENCES:
patent: 4017161 (1977-04-01), Tsuji
patent: 4113355 (1978-09-01), Tsuji et al.
patent: 4278331 (1981-07-01), Tanaka

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