Patent ID: 6707618
Filing Date: 2004-03-16
Classification: G02B

Abstract:
A variable magnification lens comprising, in order from an object side:a first lens unit having a positive refracting power; and a second lens unit having a negative refracting power, a magnification change being performed by a change of a distance between the first lens unit and the second lens unit, wherein the first lens unit consists of, in order from the object side: a sub-unit (1a) comprising at least one lens element; an aperture stop; and a sub-unit (1b) comprising at least one lens element, wherein all lens elements constituting the first lens unit are arranged with intervening air spaces between one another, and wherein the variable magnification lens satisfies the following conditions: 1.1<FLw/IH<1.35 0.80<TLt/FLt<0.94 â€ƒwhere FLw is a focal length in a wide-angle end position, FLt is a focal length in a telephoto end position, IH is a maximum image height, and TLt is a distance, in the telephoto end position, from a first surface to an image surface along an optical axis.