Patent ID: 8004595
Filing Date: 2011-08-23
Classification: H01L

Abstract:
1. A solid-state imaging device comprising a two-dimensional array of unit pixels each of which includes a light-collecting element, wherein a light-collecting element in a unit pixel of said unit pixels is a combination of circular-sector-shaped light-collecting elements having different concentric structures, a central axis of the concentric structures being perpendicular to a light-receiving plane of said light-collecting element, and each of said circular-sector-shaped light-collecting elements is divided into concentric zone areas of a width equal to or smaller than a wavelength of incident light, wherein said light-collecting element in a unit pixel located in a peripheral part of said solid-state imaging device is a combination of at least two of said circular-sector-shaped light-collecting elements having different concentric structures, and an effective refractive index distribution of said light-collecting element for incident light is asymmetrical about a first direction that is parallel to a light-receiving plane of said light-collecting element.