Three element objective lens

Details Three element objective lens Three element objective lens

1974-11-05

1976-07-06

Corbin, John K.

350189, G02B 914, G02B 304

Patent

active

039678849

ABSTRACT:
An objective lens comprising a front positive meniscus element, a middle negative biconcave element and a rear positive biconvex element. Improved optical performance at a relative aperture of f/1.70 is achieved by the incorporation of an asphere on the rear surfaces of the first and second elements.

REFERENCES:
patent: 2530397 (1950-11-01), Merte
patent: 3194139 (1965-07-01), Babcock
patent: 3575082 (1971-04-01), McClune
patent: 3762801 (1973-10-01), Baker
patent: 3838910 (1974-10-01), Ruben
patent: 3868173 (1975-02-01), Miles et al.

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