Patent ID: 8878122

Claim:
An image pickup device comprising: a plurality of pixel regions arranged in an array within a first plane, respective ones of the pixel regions including a light-condensing element formed on a light-receiving element, wherein the light-condensing element includes protrusions separated by recesses, the recesses being filled with a substance having a refractive index different from a refractive index of a material of the protrusions, respective ones of the protrusions having a width in a direction parallel to the first plane that is equal to or less than a wavelength of an electromagnetic wave incident on the light-receiving element, and respective ones of the protrusions including an edge portion that is rounded and a side surface that is perpendicular or nearly perpendicular to the first plane, wherein the protrusions include a first protrusion extending linearly in a first direction and a second protrusion extending linearly in a second direction, the first and second direction being parallel to the first plane, the recesses include a first recess extending linearly in the first direction and a second recess extending linearly in the second direction, wherein the first recess extends from a first pixel region of the plurality of pixel regions to an adjacent pixel region of the plurality of pixel regions, and the first protrusion is separate from the second protrusion.