Optical zoom lens

Details Optical zoom lens Optical zoom lens

2007-12-27

2009-08-25

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S689000

Reexamination Certificate

active

07580200

ABSTRACT:
An optical zoom lens includes, in this order from the object side to the image side thereof, a first lens group of negative refraction power, a second lens group of positive refraction power, and a third lens group of positive refraction power. The optical zoom lens satisfies the formulas of: −0.45 <Fw/f1<−0.3; and 0.4<f2/|f1|<0.8, where Fw is the smallest effective focal length of the optical zoom lens, f1is the effective focal length of the first lens group, and f2is the effective focal length of the second lens group.

REFERENCES:
patent: 6961191 (2005-11-01), Sato
patent: 2005/0041303 (2005-02-01), Nanba et al.
patent: 2005/0286138 (2005-12-01), Matsusaka

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