Compact zoom lens system

Details Compact zoom lens system Compact zoom lens system

1998-08-13

2000-01-04

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

G02B 1514

Patent

active

060116587

ABSTRACT:
A compact zoom lens system is described which includes, when viewed from an object, a first lens group with a positive refractive power; a second lens group with a negative refractive power; wherein the magnification change of the lens system can be changed by moving the first lens group and the second lens group along the optical axis of the lens system towards the object, wherein 0.45<L.sub.w /f.sub.t <0.55, 2.5<f.sub.t /f.sub.w (.phi.m)<3.0, 4.3<m2t<5. L.sub.w is the distance between the front surface which is the surface facing the object of the first lens of the first lens group, and the image plane in the wide angle position, f.sub.t is the focal length of the lens system in the telephoto position, f.sub.w is the focal length of the lens system in the wide angle position, .phi.m is the zoom ratio, and m2t is the magnification of the second lens group in the telephoto position.

REFERENCES:
patent: 5381270 (1995-01-01), Cho
patent: 5796527 (1998-08-01), Ohtake
patent: 5844725 (1998-12-01), Itoh

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