Imaging optical system, and imaging apparatus inco

专利名称：Imaging optical system, and imaging

apparatus incorporting the same

发明人：Yuki Kubota申请号：US13135778申请日：20110711公开号：US08482867B2公开日：20130709

专利附图：

摘要：The invention provides an imaging optical system comprising, in order from anobject side to an image side thereof, a first lens group of positive refracting power, asecond lens group having positive or negative refracting power and a third lens group of

positive refracting power. The optical system includes an aperture stop located betweenan object-side surface in the first lens group and an object-side surface in the second lensgroup. The lens on the most object side of the first lens group and the lens on the mostimage side of the third lens group remain constantly fixed, and upon focusing from a fardistance to a near distance, only the second lens group moves axially. The third lensgroup comprises a front lens subgroup of positive refracting power located on theobject side and a rear lens subgroup of negative refracting power located on the imageside, with the largest axial air separation in the third lens group interposed betweenthem.

申请人：Yuki Kubota

地址：Hachiojo JP

国籍：JP

代理机构：Kenyon & Kenyon LLP

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