Zoom lens system

Details Zoom lens system Zoom lens system

1996-06-04

1998-07-28

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359714, G02B 1514, G02B 1318

Patent

active

057869456

ABSTRACT:
The invention provides a compact, lightweight yet low-cost zoom lens system which has a zoom ratio of at least about 2 and is well corrected for various aberrations, and in which sufficient attention is paid to temperature compensation when plastic lenses are used. The zoom lens system comprises in order from an object side a front lens group GF including a plurality of positive lenses containing at least a plastic lens and having a positive refracting power as a whole, and a rear lens group GR composed only of a plurality of negative lenses containing at least a plastic lens, wherein zooming is carried out by varying the spacing between the front and rear lens groups, and all the lenses satisfy the following condition (1):

REFERENCES:
patent: 5301065 (1994-04-01), Lee
patent: 5610767 (1997-03-01), Ito

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