US Patent Issued to Nikon on April 29 for "Variable magnification optical system, optical apparatus, and method for producing variable magnification optical system" (Japanese Inventor)

ALEXANDRIA, Va., June 9 -- United States Patent no. 12,287,468, issued on April 29, was assigned to Nikon Corp. (Tokyo).

"Variable magnification optical system, optical apparatus, and method for producing variable magnification optical system" was invented by Takeshi Umeda (Fujisawa, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A variable magnification optical system comprising, in order from an object side, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, and a rear lens group having positive refractive power; upon varying a magnification, a distance between the first lens group and the sec...