Retractable zoom lens

Details Retractable zoom lens Retractable zoom lens

2009-02-20

2010-12-07

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S676000

Reexamination Certificate

active

07848029

ABSTRACT:
A retractable zoom lens includes sequentially from an object side, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, and a fourth lens group having positive refractive power. The third lens group includes sequentially from the object side, a first lens that is a positive lens, a second lens that is a positive lens, and a third lens that is a negative lens. The retractable zoom lens performs variable magnification by independently moving the respective lens groups along the optical axis. Further, the retractable zoom lens satisfies given conditions and maintains high optical performance while enabling a wider angle and a reduction of overall length.

REFERENCES:
patent: 2007/0070524 (2007-03-01), Sato
patent: 2005-338740 (2005-12-01), None
patent: 2006-23530 (2006-01-01), None
patent: 2006-23531 (2006-01-01), None
patent: 2006-171055 (2006-06-01), None
patent: 2006-308649 (2006-11-01), None
patent: 2006-330657 (2006-12-01), None

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