US Patent Issued to Nikon on Dec. 23 for "Zoom optical system, optical apparatus and method for manufacturing the zoom optical system" (Japanese Inventor)

ALEXANDRIA, Va., Dec. 23 -- United States Patent no. 12,504,610, issued on Dec. 23, was assigned to Nikon Corp. (Tokyo).

"Zoom optical system, optical apparatus and method for manufacturing the zoom optical system" was invented by Hiroshi Yamamoto (Kawasaki, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A zoom optical system consists of, in order from an object on an optical axis: a first lens group having a positive refractive power; a second lens group having a negative refractive power; and a rear group that includes a plurality of lens groups. The rear group comprises a first focusing lens group having a positive refractive power, and a second focusing lens group having a negative refractive power...