Zoom lens and imaging pickup

Details Zoom lens and imaging pickup Zoom lens and imaging pickup

2007-04-24

2007-04-24

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S689000

Reexamination Certificate

active

11505830

ABSTRACT:
A zoom lens having a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a positive refractive power arranged in the order from an object side, wherein the first lens group includes a negative lens and a positive lens having at least one aspherical surface arranged from the object side and satisfies the following condition: 0.4<D1/fw<0.66 where D1represents a distance, inside the first lens group, between a lens surface closest to an object and a lens surface closest to an image, and fw represents a focal distance with the zoom lens set to a wide-angle position.

REFERENCES:
patent: 6833964 (2004-12-01), Mizuguchi et al.
patent: 6853497 (2005-02-01), Yoneyama
patent: 6982834 (2006-01-01), Sato
patent: 7079326 (2006-07-01), Hirakawa
patent: 2003/0218799 (2003-11-01), Sensui et al.
patent: 2002-244043 (2002-08-01), None
patent: 2002-350726 (2002-12-01), None
patent: 2004-004765 (2004-01-01), None
European Search Report, Dec. 21, 2005.

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