Triplet type objective with a diaphragm arranged behind the lens

Details Triplet type objective with a diaphragm arranged behind the lens Triplet type objective with a diaphragm arranged behind the lens

1987-02-06

1988-11-29

Corbin, John K.

350449, G02B 914

Patent

active

047877243

ABSTRACT:
In a triplet type objective for a compact lens shutter camera with a diaphragm arranged behind the lens system, the first lens element is formed of glass and the second and third lens elements are formed of plastic, so that it is advantageous in manufacturing cost and weight. Furthermore, sufficient marginal light rays and flatness of the image field can be obtained.

REFERENCES:
patent: 3912379 (1975-10-01), DeJager
patent: 4105308 (1978-08-01), Owen, Jr. et al.
patent: 4542960 (1985-09-01), Sato

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