Zoom lens, image pickup apparatus and digital equipment

Details Zoom lens, image pickup apparatus and digital equipment Zoom lens, image pickup apparatus and digital equipment

2008-06-20

2009-12-08

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S678000, C359S684000, C359S557000

Reexamination Certificate

active

07630139

ABSTRACT:
A zoom lens includes, in order from an object side thereof: a first lens group having a negative optical power and comprising a reflection optical element; a second lens group having a positive optical power; a third lens group having a negative optical power; a fourth lens group having a positive optical power; and, a fifth lens group. The first lens group and the fourth lens group are positioned at a fixed distance and at least the second lens group, the third lens group and the fifth lens group move along an optical axis, for varying a power of the zoom lens from a wide-angle end to a telephoto end. The zoom lens satisfies a predetermined expression relating to a focal length of the first lens group, and a focal length of the zoom lens at the wide-angle end.

REFERENCES:
patent: 7372635 (2008-05-01), Morooka et al.
patent: 7532408 (2009-05-01), Souma
patent: 2008/0278824 (2008-11-01), Shirota
patent: 5-107476 (1993-04-01), None
patent: 5-323196 (2003-12-01), None
patent: 2004-348082 (2004-12-01), None
patent: 2006-71993 (2006-03-01), None

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