Zoom lens

Details Zoom lens Zoom lens

1994-06-14

1997-06-03

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359686, G02B 1514

Patent

active

056360606

ABSTRACT:
A zoom lens includes a first lens group which is fixed during zooming operation and has a positive refracting power, a second lens group which comprises a first movable lens subgroup having a negative refracting power, a second movable lens subgroup having a negative refracting power and a third movable lens subgroup having a negative refracting power or a positive refracting power. The lens groups and the movable lens subgroups are arranged in the above-described order from the object side. The second movable lens subgroup is moved toward an image along an optical axis upon zooming operation from a wide angle side end position toward a tele-side end position, and the first movable lens subgroup and the second movable lens subgroup are relatively close to each other at the wide angle side end position and at the tele-side end position and are distant from each other at an intermediate zooming position.

REFERENCES:
patent: 4054372 (1977-10-01), Schroeder
patent: 4659189 (1987-04-01), Kitagishi

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