Solid-state imaging device using light-transmitting film as a micro lens

Abstract

The present invention provides a solid-state imaging device which compensates a field curvature which occurs due to an aberration of the optical imaging system and surely receive light incident with a wide angle. Each pixel (pixel size of 2.2 μm square) in a solid-state imaging device includes a light-transmitting film with the first effective refractive index distribution and a light-transmitting film with the second effective refractive index distribution, a light-receiving element, a wiring, a wavelength selection filter, and a Si substrate. A pixel () is a pixel placed an approximate center of the solid-state imaging device. A pixel (n) is a pixel placed in the periphery of the solid-state imaging device, and a pixel (n-x) is a pixel that are placed between the pixel () and the pixel (n). The light-transmitting film of each pixel has approximately same effective refractive index distribution. Θwhich is a main light angle on the light-receiving element side, is approximately same. A main light angle in the optical imaging system is represented as Θ, Θn-x, and Θn. The light-transmitting film varies for each pixel so that a condition Θ/Θn-x<Θ/Θn.