| 摘要 |
A solid state image sensor comprises an array of pixels and a corresponding array of microlenses. The positions of the microlenses relative to their corresponding pixels vary according to the distances of the pixels from a central optical axis of the image sensor, so as to substantially eliminate vignetting of light collected by the microlenses. The array of microlenses is divided into blocks each comprising a plurality of microlenses. Within a particular block of microlenses, the positions of the microlenses relative to their corresponding pixels are varied by an equal amount. The microlenses within each of said blocks may be substantially equally spaced apart by a first distance and adjacent blocks of microlenses may be spaced apart by a second distance which is less than said first distance. Alternatively, the microlenses may be substantially equally spaced throughout said array of microlenses and selected microlenses at the edges of said blocks may be made smaller in at least one direction than the remainder of the microlenses of said blocks. The blocks may be rectangular or may have irregular edges configured such that said blocks are tessellated to form a substantially continuous array of microlenses. The pixel array and the light sensitive parts of the individual pixels preferably have substantially equal aspect ratios. <IMAGE> |
