ALEXANDRIA, Va., Sept. 23 -- United States Patent no. 12,422,652, issued on Sept. 23, was assigned to CANON K.K. (Tokyo).
"Zoom lens and image pickup apparatus" was invented by Tomoya Yamada (Tochigi, Japan), Yonghee Lee (Tochigi, Japan) and Yu Inomoto (Saitama, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A zoom lens includes, in order from object side, a positive first lens unit not moving for zooming, three or more intermediate lens units moving for zooming and a positive rear lens unit, in which each interval between adjacent lens units changes during zooming, an aperture stop is arranged in the rear lens unit, in a lens unit adjacent to the rear lens unit, or between the lens unit adjacent to th...