US Patent Issued to Nikon on March 17 for "Zoom optical system, optical apparatus and method for manufacturing the zoom optical system" (Japanese Inventors)

ALEXANDRIA, Va., March 17 -- United States Patent no. 12,578,561, issued on March 17, was assigned to Nikon Corp. (Tokyo).

"Zoom optical system, optical apparatus and method for manufacturing the zoom optical system" was invented by Fumiaki Ohtake (Tokyo), Azuna Nonaka (Yokohama, Japan), Yoshiharu Yuasa (Konosu, Japan) and Takeshi Umeda (Fujisawa, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A variable magnification optical system (ZL) comprises a preceding lens group (GA) having negative refractive power and a succeeding lens group (GB) having positive refractive power, which are arranged in order from the object side along an optical axis. The succeeding lens group (GB) has a focusing group (GF) an...