Patent ID: 8237832

Claim:
An image sensor, comprising: a substrate having a surface at which incident light is received; and a pixel array formed over and within the substrate, the pixel array including pixels, each pixel including: a photosensitive region having a sensor area disposed in the substrate; an isolation region disposed within the substrate in a region around the photosensitive region and that is adjacent to isolation regions of adjacent pixels to isolate the adjacent pixels from each other, wherein the isolation region is a dopant diffusion region without a trench isolation; a first layer of metal formed over the surface of the substrate, the first layer of metal defining a first aperture that has a first aperture area through which the incident light passes before illuminating the photosensitive region; and a second layer of metal formed over the first layer of metal, the second aperture defining a second aperture that has a second aperture area that is larger than the first aperture area, wherein the first and second apertures focus the incident light onto the photosensitive region and away from isolation region, wherein the first and second apertures include beveled edges on inner edges of the first and second apertures, the beveled edges having a slope that matches a line tangent to the inner edges of both the first and second apertures.