ALEXANDRIA, Va., Nov. 6 -- United States Patent no. 12,461,349, issued on Nov. 4, was assigned to CANON K.K. (Tokyo).
"Zoom lens and image pickup apparatus" was invented by Yonghee Lee (Tochigi, Japan), Tomoya Yamada (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 an object side to an image side: a first lens unit having a positive refractive power not moving for zooming; at least three lens units moving during zooming; and a final lens unit having a positive refractive power, wherein an interval between adjacent lens units changes during zooming, a refractive index and an Abbe number of positive lenses arranged closest to the ...