Patent ID: 6801367
Filing Date: 2004-10-05
Classification: G02B

Abstract:
A zoom lens comprising, in order from the enlarging side:a first lens group having negative refractive power that is movable for focusing and that is stationary during zooming; a second lens group having positive refractive power that moves during zooming; a third lens group that moves during zooming; a fourth lens group having positive refractive power that moves during zooming; a fifth lens group having negative refractive power that moves during zooming; and a sixth lens group having positive refractive power that is stationary during zooming; whereinsaid second lens group, said third lens group, said fourth lens group, and said fifth lens group move relative to one another along the optical axis of the zoom lens during zooming; said second lens group and said fourth lens group move continuously nearer the enlarging side when the zoom lens zooms toward the telephoto end; and said fifth lens group is nearer the enlarging side when the zoom lens is at its telephoto end than when the zoom lens is at its wide-angle end.