Zoom lens system and image pickup apparatus including the same

Details Zoom lens system and image pickup apparatus including the same Zoom lens system and image pickup apparatus including the same

2008-08-11

2009-08-25

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000, C359S690000

Reexamination Certificate

active

07580202

ABSTRACT:
A zoom lens system includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a subsequent lens-unit set including at least one lens units. Intervals between the lens units change during zooming. The first lens unit includes a negative lens element, an optical element, and a positive lens element. Various parameters are set appropriately, including the Abbe number νn and the partial dispersion ratio θgF of a material composing the optical element, the focal length f1nof the negative lens element and the Abbe number ν1nof a material composing the negative lens element, the focal length f1of the first lens unit, and respective lateral magnifications β3iwand β3itof the subsequent lens-unit set at a wide-angle end and at a telephoto end.

REFERENCES:
patent: 6606200 (2003-08-01), Nakayama
patent: 6704149 (2004-03-01), Ohmori
patent: 7206139 (2007-04-01), Bito
patent: 7304805 (2007-12-01), Endo

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