Patent ID: 8519500

Claim:
An image sensor, comprising: a substrate having an array of microlenses thereon, wherein each microlens has a flat bottom; and at least one correcting lens disposed over the substrate covering the microlens array, the correcting lens and the microlens array both in direct contact with the surface of the substrate, and the bottoms of the microlenses and the correcting lens are even with the surface of the substrate, wherein each correcting lens has only one singular curvature and optical power; and at least one photodiode disposed under the substrate for receiving a light, wherein the photodiode is laterally aligned with a corresponding microlens, and the curvature of the correcting lenses at each of the different portions thereof is matched with the curvature of each of the microlenses located directly under the portion of the correcting lens, from a plurality of edge parts to a central part of the array of the microlenses, and the distance of each microlens to the photodiode is the same as the focal length of the microlens, so as to allow each microlens to collect light into a spot on the photodiode.