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...

2007-11-14

2008-10-07

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S683000, C359S684000, C359S685000, C359S715000, C359S740000, C359S774000

Reexamination Certificate

active

07433132

ABSTRACT:
A four-unit zoom lens system includes in order from an object side, a first lens unit having a positive refracting power, a second lens unit having a negative refracting power, a third lens unit having a positive refracting power, and a fourth lens unit having a positive refracting power, in which at a time of zooming from a wide angle end to a telephoto end, at least the first lens unit, the second lens unit, and the third lens unit move, and a space between the lens units changes, and a total number of lenses in the second lens unit is not more than three, and the zoom lens system satisfies the following conditional expressions.in-line-formulae description="In-line Formulae" end="lead"?1.2<(β2t/β2w)/(β3t/β3w)<6.0 and   (1A)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?3.0<ft/fw<20.0   (2A)in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
patent: 6185048 (2001-02-01), Ishii et al.
patent: 6606200 (2003-08-01), Nakayama et al.
patent: 6744571 (2004-06-01), Ishii et al.
patent: 6822807 (2004-11-01), Yoneyama
patent: 7365913 (2008-04-01), Hamano et al.
patent: 2005/0243437 (2005-11-01), Hozumi et al.
patent: 2004-037921 (2004-02-01), None
patent: 2006-023531 (2006-01-01), None

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