Patent ID: 7294873

Claim:
An X-Y address type solid state image pickup device comprising a plurality of unit pixels, each of the pixels comprising an active device for converting a signal charge obtained through photo-electric conversion by a photo-electric conversion portion into an electrical signal and outputting said electrical signal, wherein a wiring layer comprising wirings for said active devices is provided on a first surface side of a device layer comprising said photo-electric conversion portion, and incident light is taken into said photo-electric conversion portion from a second surface side of said device layer which is opposite to said first surface side, and wherein a well is provided in said device layer and positioned at a side of said photo-electric conversion device and further wherein the photo-electric conversion devices have wider portions in a light receiving side of the device layer, said photo-electric conversion portion is formed to be greater in surface area on the light-receiving surface side than on the wiring layer side, such that the photo-electric conversion portion includes a light receiving region that extends to overlap in a depth direction at least a portion of a transfer transistor and at least a portion of the floating diffusion.