Zoom lens and imaging apparatus incorporating the same

Details Zoom lens and imaging apparatus incorporating the same Zoom lens and imaging apparatus incorporating the same

2009-04-15

2010-06-15

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

07738184

ABSTRACT:
A zoom lens consists of, in order from its object side, a first lens group of negative refracting power, and a second lens group of positive refractive power. Zooming from a wide-angle end to a telephoto end is implemented by changing a distance between the respective lens groups. The first lens group consists of, in order from its object side, a front unit of negative refracting power, and a rear unit of negative refracting power. The front unit consists of, in order from its object side, a first lens that has negative refracting power, and a second lens with smaller refracting power than the first lens. The rear unit consists of, in order from its object side, a third lens of negative refracting power, a fourth lens of negative refracting power, and a fifth lens that has positive refracting power.

REFERENCES:
patent: 2002/0196560 (2002-12-01), Endo
patent: 2003/0234985 (2003-12-01), Sato
patent: 2007/0070520 (2007-03-01), Kimura et al.
patent: 2001-166206 (2001-06-01), None
patent: 2004-021223 (2004-01-01), None
patent: 2007-094176 (2007-04-01), None

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