Zoom lens and image pickup apparatus

Details Zoom lens and image pickup apparatus Zoom lens and image pickup apparatus

2008-08-25

2010-06-22

Spector, David N (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S695000, C359S680000

Reexamination Certificate

active

07742236

ABSTRACT:
A zoom lens includes, in order from an object side, a first lens group having a negative power, a second lens group having a positive power, and a third lens group having a positive power. At least the first and second lens groups are movable during a change from a wide-angle end state in which a focal length becomes shortest to a telephoto end state in which the focal length becomes longest. The first lens group is constructed of a glass lens and a plastic lens, the glass lens being positioned on the object side and having a negative power, the plastic lens being positioned on an image side and having a positive power. The second lens group includes a single plastic lens having a negative power. The third lens group includes at least one plastic lens having a positive power. The lenses are satisfied predetermined conditions.

REFERENCES:
patent: 6229655 (2001-05-01), Kohno et al.
patent: 6977778 (2005-12-01), Nose et al.
patent: 7042652 (2006-05-01), Nose et al.
patent: 7139129 (2006-11-01), Nose et al.
patent: 7180679 (2007-02-01), Nose et al.
patent: 7215484 (2007-05-01), Yamashita et al.
patent: 2000-267009 (2000-09-01), None

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