ALEXANDRIA, Va., Feb. 24 -- United States Patent no. 12,560,779, issued on Feb. 24, was assigned to CANON K.K. (Tokyo).
"Optical system, optical apparatus, and image pickup apparatus" was invented by Tatsuro Watanabe (Tochigi, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An optical system includes a first unit fixed during focusing, a second unit configured to move during focusing, and a third unit fixed during focusing on an image side of the second unit. The first unit includes a first optical element having a first reflective surface that has a concave shape toward an object side, and a second optical element having a second reflective surface that has a convex shape toward an image side. Light in...