Wide angle zoom lens

Details Wide angle zoom lens Wide angle zoom lens

1980-09-18

1983-06-28

Corbin, John K.

350428, G02B 1518

Patent

active

043902480

ABSTRACT:
In the wide angle zoom lens disclosed, a first lens group of positive refractive power is stationary during zooming, but movable for focusing and consists of four elements forming three members, namely from front to rear, a cemented lens and two positive lenses, all three in meniscus form with convex curvature toward the front, and with the cemented lens being almost afocal with its cemented surface divergent and convex toward the front. A second lens group of negative refractive power is movable for changing the magnification and consists of four elements, namely, from front to rear, two negative meniscus lenses of forward convixity, a bi-concave negative lens and a positive lens, with the bi-concave negative lens and the positive lens defining an air space having a converging effect. A third lens group is movable for maintaining a constant image plane as the second group moves to effect a change in magnification, and a fourth lens group positioned in the rear of the third group is stationary during zooming.

REFERENCES:
patent: 3609005 (1971-09-01), Nakamura
patent: 4050788 (1975-11-01), Wendisch

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