Objective for endoscopes

Details Objective for endoscopes Objective for endoscopes

1981-10-07

1983-09-13

Corbin, John K.

350450, 350 9626, G02B 516, G02B 960

Patent

active

044038372

ABSTRACT:
An objective for endoscopes comprising a first, second, third, fourth and fifth lens components in which the first lens component is a negative meniscus lens having a convex surface on the object side, the second lens component is a positive meniscus lens having a concave surface on the object side, the third lens component is a positive lens, the fourth lens component is a cemented lens consisting of a positive lens element and a negative lens element cemented to said positive lens element, and the fifth lens component is a positive lens, the objective for endoscopes having a very wide angle of view and well corrected aberrations.

REFERENCES:
patent: 3410632 (1968-11-01), Woltche
patent: 4059344 (1977-11-01), Yamasita
patent: 4269485 (1981-05-01), Yamashita et al.

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