Four-group great aperture ratio zoom lens

Details Four-group great aperture ratio zoom lens Four-group great aperture ratio zoom lens

1982-09-22

1984-08-28

Corbin, John K.

G02B 964, G02B 1518

Patent

active

044680970

ABSTRACT:
A great aperture ratio zoom lens has, in succession from the object side, a first lens group of positive refractive power having a focusing function, a second lens group of negative refractive power having a magnification changing function, a third lens group of positive refractive power having a correcting function for keeping the image plane at a predetermined position, and a fourth lens group of positive refractive power having an imaging function. The first to third lens groups from a substantially a focal magnification changing portion. The fourth lens group includes, in succession from the object side, a forward group comprising a positive meniscus lens component having its convex surface facing the object side, a positive lens components having its surface of sharper curvature facing the image side, and a biconcave lens component, and a rearward group having a negative lens component and a positive lens component. The zoom lens satisfies certain conditions.

REFERENCES:
patent: 4223981 (1980-09-01), Mizutani et al.
patent: 4380377 (1983-04-01), Sato et al.

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