Zoom lens system

Details Zoom lens system Zoom lens system

2006-05-24

2009-06-30

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S682000

Reexamination Certificate

active

07554748

ABSTRACT:
An exemplary zoom lens system includes a negative first lens group and a positive second lens group. The first lens group includes a meniscus-shaped first lens with negative refracting power and a second lens with positive refracting power. The first lens has a concave surface facing an image side. The second lens group includes an aperture stop, a biconvex third lens with positive refracting power, and a meniscus-shaped fourth lens with negative refracting power. The fourth lens has a concave surface facing an object side. The first lens, the second lens, the aperture stop, the third lens and the fourth lens are aligned in that order from the object side to the image side.

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