Patent ID: 8610228
Filing Date: 2013-12-17
Classification: G02B,H01L

Abstract:
1. A solid-state image sensor comprising: a substrate; unit-pixels arranged on said substrate; a wiring layer formed on said unit-pixels; optical waveguide regions each formed on a photoelectric conversion region included in a corresponding one of said unit-pixels, and penetrating said wiring layer; and light-collecting elements each formed above a corresponding one of said optical waveguide regions, wherein: each of said light-collecting elements is a gradient index microlens having an effective refractive index distribution, each of said light-collecting elements includes a first region having a function for deflecting incident light and a second region having a function for deflecting and collecting the incident light, and a refractive index distribution of the first region is represented by a primary expression of a distance from a center of each of said unit-pixels.