Zoom lens and imaging apparatus

Details Zoom lens and imaging apparatus Zoom lens and imaging apparatus

2011-03-29

2011-03-29

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

07916399

ABSTRACT:
A first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having the negative refractive power, and a fourth lens group having the positive refractive power are included in order from an object side, and variation of magnification from a wide-angle end to a telephoto end is performed by monotonically moving the second lens group toward an image side and compensation of a fluctuation of an image surface resulting from the variation of magnification is performed by moving the third lens group. At least one positive lens having an optical material satisfying a conditional expressions is included in at least one of the first lens group G1and the fourth lens group.

REFERENCES:
patent: 7139131 (2006-11-01), Nanba et al.
patent: 7292398 (2007-11-01), Misaka
patent: 7304805 (2007-12-01), Endo et al.
patent: 2005-345892 (2005-12-01), None
patent: 2006-78964 (2006-03-01), None
patent: 2006-349947 (2006-12-01), None
patent: 2007-163964 (2007-06-01), None

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