Zoom lens system

Details Zoom lens system Zoom lens system

2008-04-07

2010-10-05

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S682000, C359S686000

Reexamination Certificate

active

07808721

ABSTRACT:
A zoom lens system which includes, in order from an object side, a first lens unit having a negative refractive power; a second lens unit having a positive refractive power; and a third lens unit having a positive refractive power, a space between the lens units is changed to perform magnification change; a lens of the second lens unit closest to an image side has a concave surface which faces the image side; a lens of the third lens unit closest to the object side is a negative lens whose concave surface faces the object side; and during the magnification change, the space between the second lens unit and the third lens unit is larger in a telephoto end than in a wide-angle end.

REFERENCES:
patent: 5331462 (1994-07-01), Yano
patent: 6930839 (2005-08-01), Hagimori et al.
patent: 7079325 (2006-07-01), Konno
patent: 7382547 (2008-06-01), Satori
patent: 2004-318099 (2004-11-01), None
patent: 2004-318106 (2004-11-01), None
patent: 2004-318107 (2004-11-01), None

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