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

1988-11-17

1990-01-09

Dzierzynski, P. M.

350449, 350432, G02B 914

Patent

active

048923982

ABSTRACT:
In a triplet type objective for a compact lens shutter camera with a diaphragm arranged behind the lens system, the first and the second lens elements are formed of plastic and the third lens element is formed of glass, so that it is advantageous in manufacturing cost and weight. Therefore, an F No. of the objective is small and aberrations, for example astigmatic difference, are corrected well.

REFERENCES:
patent: 3784287 (1974-01-01), Grey
patent: 4105308 (1978-08-01), Owen, Jr. et al.
patent: 4542961 (1985-09-01), Sato

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