US Patent 7262448 CMOS image sensor

A CMOS image sensor is disclosed, to improve light-condensing efficiency by forming a minute lens array having a large curvature (long focal distance) for the increase in height of upper structures above a photodiode, which includes a lower layer formed of the photodiode, metal circuits, and insulating interlayers for insulating the metal circuits from one another; a color filter array of R, G and B formed on the lower layer; an overcoat layer formed on the color filter array; a micro-lens formed on the overcoat layer; and the minute lens array having minute lenses formed between the lower layer and the color filter array, each minute lens having a larger curvature than that of the micro-lens.