Zoom lens

Details Zoom lens Zoom lens

2007-10-09

2007-10-09

Mack, Ricky L (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S691000

Reexamination Certificate

active

11219781

ABSTRACT:
A zoom lens comprises, in order from an object side to an image side, a lens group having negative refracting power, and a lens group having positive refracting power. Zooming is carried out with a change in a space between at least said two lens groups. The lens group having negative refracting power comprises a plurality of aspheric surfaces. The lens group having positive refracting power comprises at least one aspherie surface. The lens group having negative refracting power comprises at least three negative lenses, with satisfaction of the following condition: 2.3<|f2/f1<3.1, where f1is a focal length of said lens group having negative refracting power, and f2is a focal length of said lens group having positive refracting power.

REFERENCES:
patent: 3737214 (1973-06-01), Shimizu
patent: 3832035 (1974-08-01), Takahashi
patent: 6982834 (2006-01-01), Sato
patent: 07-261082 (1995-10-01), None
patent: 2000-221399 (2000-08-01), None
patent: 2002-287031 (2002-10-01), None

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