US Patent Issued to Nikon on July 21 for "Optical system, optical apparatus and method for manufacturing the optical system" (Japanese Inventor)

ALEXANDRIA, Va., July 21 -- United States Patent no. 12,687,709, issued on July 21, was assigned to Nikon Corp. (Tokyo).

"Optical system, optical apparatus and method for manufacturing the optical system" was invented by Tomonori Kuribayashi (Yokohama, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "An optical system (OL) comprising, sequentially along an optical axis from the objective side, a first lens group (G1) having a positive refractive power, a second lens group (G2) having a negative refractive power, a third lens group (G3) having a positive refractive power, and a fourth lens group (G4) having a negative refractive power, wherein, when focusing the optical system, the following conditional e...