US Patent Issued to Canon on April 14 for "Optical element, optical equipment, and imaging apparatus" (Japanese Inventor)

ALEXANDRIA, Va., April 15 -- United States Patent no. 12,601,864, issued on April 14, was assigned to Canon K.K. (Tokyo).

"Optical element, optical equipment, and imaging apparatus" was invented by Hideo Ukuda (Kanagawa, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "An optical element including a first optical layer, a second optical layer, and a transparent base material, the first optical layer being disposed between the second optical layer and the transparent base material and a diffraction grating being disposed at the interface between the first optical layer and the second optical layer, wherein the refractive index of the d-line of the second optical layer is higher than the refractive index o...