Zoom lens and an imaging apparatus incorporating the same

Details Zoom lens and an imaging apparatus incorporating the same Zoom lens and an imaging apparatus incorporating the same

2009-06-16

2010-11-09

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000, C348S335000, C348S240300

Reexamination Certificate

active

07830613

ABSTRACT:
The first lens group comprises a positive lens and a negative lens, and the total number of lenses in the first lens group is 2. The second lens group consists of, in order from the object side, a front unit of negative refracting power and a rear unit of positive refracting power. The third lens group consists of, in order from the object side, a front unit of positive refracting power and a rear unit of negative refracting power. The fourth lens group comprises a positive lens component, and the total number of lens components in the fourth lens group is 1. The front unit of the second lens group comprises a negative lens component, and the total number of lens components in the front unit of the second lens group is 1. The rear unit of the second lens group comprises, in order from the object side to the image side, a negative lens and a positive lens, and the total number of lenses in the rear unit of the second lens group is 2. The negative lens component in the front unit of the second lens group and the negative lens in the rear unit of the second lens group satisfy the following condition (1A):in-line-formulae description="In-line Formulae" end="lead"?2.9<f2GN2/f2GN1<30  (1A)in-line-formulae description="In-line Formulae" end="tail"?where f2GN1is the focal length of the negative lens component in the front unit of the second lens group, andf2GN2is the focal length of the negative lens in the rear unit of the second lens group.

REFERENCES:
patent: 5231540 (1993-07-01), Shibata
patent: 7675690 (2010-03-01), Satori
patent: 101131466 (2008-02-01), None
patent: 2003-315676 (2003-11-01), None
patent: 2005-331628 (2005-12-01), None
patent: 2008-102165 (2008-05-01), None
patent: 2008-102166 (2008-05-01), None

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