Objective lens

Details Objective lens Objective lens

1983-02-22

1985-06-25

Corbin, John K.

350449, G02B 960

Patent

active

045250391

ABSTRACT:
An objective lens comprises an iris diaphragm (D.sub.1) at the front and an optical assembly disposed behind the iris diaphragm. The optical assembly comprises a plano-convex front lens unit (G) with its plane surface facing the front of the lens, whereby the lens is suitable for use in media with different refractive indices (in practice, air and water). It further comprises a rear lens unit (G') adapted to apply the necessary correction to maintain abberations within reasonable limits and to achieve a required distance from the lens to the focal image plane. The invention is applicable, in particular, to discreet surveillance using a camera.

REFERENCES:
patent: 2687063 (1954-08-01), Coleman
patent: 3485547 (1969-12-01), Bougon et al.
patent: 4289385 (1981-09-01), Yamagata

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