Patent ID: 9146386
Filing Date: 2015-09-29
Classification: G02B

Abstract:
1. A zoom lens that comprises a first lens group and a rear lens group that is at an image side of the zoom lens relative to the first lens group, said rear lens group including an optical element, the optical element comprising, in order from an object side: a first segment group having positive refractive power; a second segment group having positive refractive power; a third segment group having negative refractive power; and a fourth segment group having positive refractive power; focusing of the zoom lens being conducted by moving said first segment group along an optical axis, said third segment group being moved in a direction including a component perpendicular to the optical axis, and said optical element having positive refractive power on the whole, and satisfying the following conditional expression: where Fb1 denotes a focal length of said first segment group, and Fb234 denotes a combined focal length of said second segment group, said third segment group and said fourth segment group, wherein the second segment group has a plurality of lenses; an interval in the optical-axis direction between the first segment group and the second segment group is fixed upon zooming of the zoom lens; and an interval in the optical-axis direction between the second segment group and the third segment group and an interval in the optical-axis direction between the third segment group and the fourth segment group are fixed upon zooming and are fixed upon focusing of the zoom lens.