Image sensor with three sets of microlenses

Abstract

An image sensor includes a substrate having a plurality of photosensitive sites; a plurality of first microlenses spanning the pixels and respectively aligned with the plurality of photosensitive sites that receives incident light; an optically transmissive layer positioned between the substrate and the plurality of first microlenses; a layer of second microlenses positioned between the first microlenses and the optically transmissive layer that receives the incident light from the plurality of first microlenses for focusing the incident light onto a plane between the photosensitive sites and the first layer of microlenses; and a layer of third microlenses positioned between the optically transmissive layer and the photosensitive sites that receives the incident light from the first layer of microlenses for focusing the incident light onto the photosensitive sites.

Dependencies are inferred from the claim text.