Aspheric plastic triplet

Details Aspheric plastic triplet Aspheric plastic triplet

1977-01-03

1978-08-08

Sacher, Paul A.

350175NG, 350226, G02B 304, G02B 914

Patent

active

041053087

ABSTRACT:
A multi-element photographic lens has a strongly aspheric surface formed on a strong lens element that is movable relative to the other elements along a common optical axis. The aspheric surface corrects at least the lower order aberrations contributed by the movable element thereby allowing the movement to focus the lens over a wide focus scale or object distance. Preferably, the elements are formed of plastic, the movable element is a front element, and at least one other aspheric surface is formed on a lens element.

REFERENCES:
patent: 3578847 (1971-05-01), Grey
patent: 3762801 (1973-10-01), Baker
patent: 3910685 (1975-10-01), De Jager
patent: 3944337 (1976-03-01), Ruben
patent: 3967884 (1976-07-01), De Jager

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