US Patent Issued to CANON on April 21 for "Optical element, imaging optical system, and optical apparatus" (Japanese Inventor)

ALEXANDRIA, Va., April 21 -- United States Patent no. 12,607,784, issued on April 21, was assigned to CANON K.K. (Tokyo).

"Optical element, imaging optical system, and optical apparatus" was invented by Kazue Uchida (Tochigi, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "An optical element for an imaging optical system includes a substrate including a curved surface, and a multilayer film formed on the curved surface. The multilayer film includes a plurality of first films made of a first material and a plurality of second films made of a second material, each of the plurality of first films and each of the plurality of second films are alternately laminated. A predetermined inequality is satisfied."...