Patent ID: 9300884
Filing Date: 2016-03-29
CPC Classification: H01L,H04N

Claim Text:
1. A solid-state image sensor including a semiconductor substrate having a first face and a second face opposite to the first face, the solid-state image sensor comprising: a plurality of pixel groups each including a plurality of pixels, each pixel having a photoelectric converter formed in the semiconductor substrate and a wiring layer that configures a part of a circuit in the pixel, the photoelectric converter including a region whose major carriers are the same as charges to be accumulated in the photoelectric converter as a signal; and a plurality of microlenses that are located so that one microlens is arranged for each pixel group, wherein each wiring layer is located at a side of the first face of the semiconductor substrate, and the plurality of microlenses are located at a side of the second face of the semiconductor substrate, wherein light-incidence faces of the regions of the photoelectric converters of each pixel group are arranged along the second face such that the light-incidence faces are apart from each other in a direction along the second face, wherein the photoelectric converter includes a semiconductor region of a first conductivity type, which is configured to accumulate charges as a signal, and a maximum value of an impurity concentration of a second conductivity type in a region between two nearest semiconductor regions, of the semiconductor regions of the plurality of pixels that belong to a single pixel group, is smaller than a maximum value of an impurity concentration of the second conductivity type in a region between two nearest semiconductor regions, of the semiconductor regions of the plurality of pixels that belong to different pixel groups.