Zoom lens

Details Zoom lens Zoom lens

2005-02-08

2005-02-08

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

06853498

ABSTRACT:
The zoom lens comprises, in order from an object side: a first lens group having a negative refractive power, the first lens group including a first lens having a negative refractive power, and a second lens having a positive refractive power; a second lens group having a positive refractive power, the second lens group including a third lens having a positive refractive power, and a fourth lens having a negative refractive power; and a third lens group having a positive refractive power, the third lens group including a fifth lens having a positive refractive power, the zoom lens satisfying the following conditional expression:-3.0<f1fw<-2.0where f1denotes the focal length of the first lens group; and fwdenotes the total focal length at a wide-angle position.

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patent: 2000-267009 (2000-09-01), None

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