Focusing-in-part lens system

Details Focusing-in-part lens system Focusing-in-part lens system

1981-02-10

1988-11-15

Corbin, John K.

350469, 350470, G02B 942, G02B 950, G02B 952

Patent

active

047844809

ABSTRACT:
An objective lens comprising a front lens group of positive power followed by a diaphragm, and a rear lens group of positive power axially movable for focusing and comprised of a plurality of members with the strongest diverging surface of concave curvature being arranged toward the front of the lens.

REFERENCES:
patent: 2503789 (1950-04-01), Wood et al.
patent: 2537912 (1951-01-01), Reiss
patent: 3784285 (1974-01-01), Watanabe et al.
patent: 3815974 (1974-06-01), Momiyama
patent: 4057329 (1977-11-01), Fleischman
patent: 4124276 (1978-11-01), Okano et al.
patent: 4311367 (1982-01-01), Mori

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