Patent ID: 7888766

Claim:
A photodiode array comprising a semiconductor substrate of a first conductive type, wherein a plurality of photodiodes are formed in array on an opposite surface side to an incident surface of light to be detected, in the semiconductor substrate, wherein a plurality of impurity diffused layers of a second conductive type are arranged in array on the opposite surface side to the incident surface of light to be detected, in the semiconductor substrate, wherein each of the plurality of photodiodes is formed by pn junction formed of the impurity diffused layer and the semiconductor substrate, wherein a plurality of depressions with a predetermined depth more depressed than a regions not corresponding to a region where the respective photodiodes is formed, are formed in the respective regions corresponding to the respective photodiodes is formed, on a side of the incident surface of the light to be detected, in the semiconductor substrate, and wherein adjacent depressions are in communication with each other at their respective corners, in the semiconductor substrate.