Patent ID: 7728901

Claim:
A solid-state imaging device comprising a plurality of unit pixels, wherein each of said unit pixels includes a light-collecting unit operable to collect incident light from an optical imaging system and a wavelength selection filter which selects a light of predetermined wavelength, wherein said light-collecting unit includes a first refractive index distribution and a second refractive index distribution and a refractive index distribution adapted to the light selected by said wavelength selection filter, wherein the first refractive index distribution has an effective refractive index distribution forming a concentric circular structure of a first light-transmitting film, wherein said wavelength selection filter is placed between the first light-transmitting film with the first refractive index distribution and a second light-transmitting film with the second refractive index distribution, wherein the width of the first light-transmitting film is equal to or smaller than a wavelength of incident light, and wherein a focal length or an angular magnification of said light-collecting unit varies from unit pixel to adjacent unit pixel so that an aberration of the optical imaging system is corrected.