Zoom lens and image pickup apparatus including the same

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

2011-01-04

2011-01-04

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S676000, C359S686000, C359S690000

Reexamination Certificate

active

07864445

ABSTRACT:
A zoom lens which includes in order from an object side to an image side: a first lens unit with a positive refractive power; a second lens unit with a negative refractive power; and a subsequent lens unit. The second lens unit moves on an optical axis to increase an interval between the first and second lens units during zooming from a wide angle end to a telephoto end. The first lens unit includes a front side lens subunit immovable during focusing with a positive refractive power and a rear side lens subunit movable during focusing with a positive refractive power. A PR lens of the rear side lens subunit and a N2 lens of the second lens unit are made of a material wherein an Abbe number (νd) and a partial dispersion ratio (θgF) are suitably set.

REFERENCES:
patent: 6404561 (2002-06-01), Isono et al.
patent: 6414799 (2002-07-01), Uzawa et al.
patent: 6594087 (2003-07-01), Uzawa et al.
patent: 8-248317 (1996-09-01), None

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