Zoom lens and imaging device

Details Zoom lens and imaging device Zoom lens and imaging device

2007-02-13

2007-02-13

Mack, Ricky (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S689000

Reexamination Certificate

active

11212875

ABSTRACT:
Disclosed is a zoom lens having a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a positive refractive power arranged in the mentioned order from an object side, wherein the first lens group includes a negative lens and a positive lens having at least one aspherical surface arranged in the mentioned order from the object side and satisfies a following inequality (1):in-line-formulae description="In-line Formulae" end="lead"?0.4<D1/fw<0.66   (1)in-line-formulae description="In-line Formulae" end="tail"?where D1 represents a distance, inside the first lens group, between a lens surface closest to an object and a lens surface closest to an image, and fw represents a focal distance with the zoom lens set to a wide-angle position.

REFERENCES:
patent: 6844986 (2005-01-01), Nanba
patent: 6943962 (2005-09-01), Sekita
patent: 6989943 (2006-01-01), Itoh
patent: 2003/0218799 (2003-11-01), Sensui et al.
patent: 2002-244043 (2002-08-01), None
patent: 2002-350726 (2002-12-01), None
patent: 2004-004765 (2004-01-01), None
European Search Report, Dated Dec. 21, 2005.

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