ALEXANDRIA, Va., Sept. 3 -- United States Patent no. 12,405,456, issued on Sept. 2, was assigned to CANON K.K. (Tokyo).
"Zoom lens and image pickup apparatus" was invented by Shunji Iwamoto (Tochigi, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A zoom lens includes, in order from an object side to an image side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, and a rear group including at least four lens units that move during zooming. Distances between adjacent lens units change during zooming. The first lens unit is fixed relative to an image plane during zooming and during focusing. The first lens unit includes at least three lenses having p...