US Patent Issued to Nikon on May 13 for "Variable magnification optical system, optical device, and method for producing variable magnification optical system" (Japanese Inventors)

ALEXANDRIA, Va., June 12 -- United States Patent no. 12,298,485, issued on May 13, was assigned to Nikon Corp. (Tokyo).

"Variable magnification optical system, optical device, and method for producing variable magnification optical system" was invented by Akihiko Obama (Tokyo) and Masashi Yamashita (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "A variable magnification optical system has, in order from an object side: a first lens group having positive refractive power; a second lens group having negative refractive power; an aperture stop; a third lens group having positive refractive power; and a rear lens group. Upon zooming from a wide-angle end state to a telephoto end state, at least the rear le...