Large aperture objective with behind the lens diaphragm

Details Large aperture objective with behind the lens diaphragm Large aperture objective with behind the lens diaphragm

1980-06-02

1983-10-04

Corbin, John K.

350449, G02B 960

Patent

active

044075685

ABSTRACT:
A large aperture objective having a shorter physical length than 1.2 times the focal length thereof with an angular field of at least 54.degree. and a diaphragm positioned on the image side of the rearmost lens surface. The objective comprises five elements constituting five components of which the first and second counting from the front are positive meniscus lenses of forward convexity, the third is a negative meniscus lens of rearward concavity, the fourth is a negative meniscus lens of forward concavity, and the fifth is a bi-convex lens with its rear surface of strong curvature. The objective is characterized by fulfilling the following conditions:

REFERENCES:
patent: 2445594 (1948-07-01), Bennett
patent: 4264138 (1981-04-01), Imai
patent: 4289385 (1981-09-01), Yamagata

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