Zoom lens and imager using the same

Details Zoom lens and imager using the same Zoom lens and imager using the same

2007-09-11

2007-09-11

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000, C359S689000

Reexamination Certificate

active

11407997

ABSTRACT:
The invention is concerned with a zoom lens that is well fit for a digital type single-lens reflex camera, has improved optical performance, and is bright all over the zooming zone. The zoom lens comprises a first group G1of positive power, a second group G2of negative power and a third group G3of positive power. Upon zooming, the first group G1remains fixed, and the second G2and the third group G3are movable. The first group G1comprises a subgroup1A of negative power and a subgroup1B of positive power, and the second group G2comprises a first negative lens, a cemented positive lens, a second negative lens and a third negative lens. The zoom lens satisfies conditions (1) and (2) with respect to the focal length of the subgroup1A and the focal length of the second group G2.

REFERENCES:
patent: 5745300 (1998-04-01), Usui et al.
patent: 5760967 (1998-06-01), Terasawa et al.
patent: 5835282 (1998-11-01), Suenaga et al.
patent: 6646804 (2003-11-01), Harada
patent: 6778329 (2004-08-01), Ozaki
patent: 2001-344766 (2001-12-01), None

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