US Patent Issued to Nikon on June 17 for "Variable magnification optical system, optical equipment, and method for producing variable magnification optical system" (Japanese Inventors)

ALEXANDRIA, Va., June 19 -- United States Patent no. 12,332,413, issued on June 17, was assigned to Nikon Corp. (Tokyo).

"Variable magnification optical system, optical equipment, and method for producing variable magnification optical system" was invented by Takahiro Ishikawa (Kawasaki, Japan) and Norikazu Yokoi (Yokohama, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A variable magnification optical system comprising a plurality of lens groups which includes a first positive lens group disposed at a most object side and having positive refractive power, a first negative lens group disposed at an image side of the first positive lens group and having negative refractive power, and a second negative l...