Zoom lens system and image pickup apparatus having the same

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

2007-11-20

2008-09-02

Choi, William C (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000

Reexamination Certificate

active

07420746

ABSTRACT:
A zoom lens system, which has a high zoom ratio while having a high optical performance, includes, in order from an object side to an image side, a first lens unit having a positive optical power, a second lens unit having a negative optical power, a third lens unit having a positive optical power, and a fourth lens unit having a positive optical power. The second lens unit and the fourth lens unit move during zooming. Lens elements constituting the first lens unit and the second lens unit are appropriately set.

REFERENCES:
patent: 5638216 (1997-06-01), Horiuchi
patent: 6577450 (2003-06-01), Hamano et al.
patent: 6751029 (2004-06-01), Horiuchi
patent: 6972909 (2005-12-01), Hamano
patent: 05-060971 (1993-03-01), None
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patent: 2000-121941 (2000-04-01), None
patent: 2003-295053 (2003-10-01), None
patent: 2005-242014 (2005-09-01), None

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