Zoom lens system for finite conjugate distances

Details Zoom lens system for finite conjugate distances Zoom lens system for finite conjugate distances

1983-07-14

1985-04-30

Corbin, John K.

350446, G02B 1516, G02B 1700

Patent

active

045140499

ABSTRACT:
A zoom lens system for use as a copying lens, for example, comprises first to sixth elements arranged in this order from front to rear with a stop disposed between the third and fourth elements. The first element is a positive lens convex to the front and the second element is a negative lens concave to the front. The first and second elements together form a first stationary lens group having negative power. The third element is a positive lens and forms a first movable lens. The sixth, fifth and fourth elements are reverse duplicates of the first, second and third elements. The fourth element forms a second movable lens, and the fifth and sixth elements together form a second stationary lens group. The lens system is axially movable as a unit between fixed image and object planes. The first and second movable lenses are axially movable in response to the axial movement of the entire lens system to vary the magnification of the image. The following three conditions are satisfied.

REFERENCES:
patent: 4037937 (1977-07-01), Minoura
patent: 4149774 (1979-04-01), Hirano et al.

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