Zoom lens

Details Zoom lens Zoom lens

1997-09-23

1999-08-03

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359713, 359714, G02B 1514

Patent

active

059332840

ABSTRACT:
A zoom lens, comprises a first lens group, provided in an object side, having a positive refracting power; and a second lens group, provided in an image side from the first lens group, having a negative refracting power; wherein the zoom lens changes magnification by changing a distance between the first and second lens groups, the first lens group comprises a 1a lens subgroup having a negative refracting power, a diaphragm and a 1b lens subgroup having a positive refracting power all arranged in such the order from the object side to the image side; and the zoom lens satisfies the following conditions:

REFERENCES:
patent: 5153777 (1992-10-01), Okada et al.
patent: 5218478 (1993-06-01), Itoh
patent: 5585971 (1996-12-01), Itoh
patent: 5757556 (1998-05-01), Nishimura

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