Zoom lens system and electronic image pickup apparatus using...

Details Zoom lens system and electronic image pickup apparatus using... Zoom lens system and electronic image pickup apparatus using...

2006-12-14

2008-03-04

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S684000, C359S689000

Reexamination Certificate

active

07339745

ABSTRACT:
A zoom lens system comprising, a first negative lens unit; a second positive lens unit; and a third negative lens unit, wherein a space between the second and third lens units changes during magnification change or focusing operation; the second lens unit and the third lens unit move only to the object side during the magnification change from a wide-angle end to a telephoto end so that a space between the first and second lens units is narrower in the telephoto end than in the wide-angle end; the first lens unit comprises a negative lens and a positive lens; the second lens unit comprises at most three lenses; the third lens unit comprises a negative lens; and the following condition (1) is satisfied:in-line-formulae description="In-line Formulae" end="lead"?0.7<Cj(t)/Cj(w)<1.2.   (1)in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
patent: 7215484 (2007-05-01), Yamashita et al.
patent: 2004-294910 (2004-10-01), None
patent: 2005-077692 (2005-03-01), None

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