Multiple image formation position shift detection device, image concentration detection device, and multiple image formation device

摘要

A photodetecting unit 5 comprises a photosensitive region 10 , a first signal processing circuit 20 , and a second signal processing circuit 30 . In photosensitive region 10 , pixels 11 _mn are arrayed two-dimensionally in M rows and N columns. One pixel is arranged by adjacently positioning in the same plane a photosensitive portion 12 _mn and a photosensitive portion 13 _mn, each outputting a current that is in accordance with the intensity of light that is made incident thereon. Across each of the pluralities of pixels 11 ₁₁ to 11 _1N , . . . , 11 _M1 to 11 _MN, aligned in a first direction in the two-dimensional array, one photosensitive portion 12 _mn of each corresponding pixel is electrically connected to the same photosensitive portion 12 _mn of each of the other corresponding pixels. Also across each of the pluralities of pixels 11 ₁₁ to 11 _M1 , . . . , 11 _1N to 11 _MN, aligned in a second direction in the two-dimensional array, the other photosensitive portion 13 _mn of each corresponding pixel is connected to the same photosensitive portion 13 _mn of each of the other corresponding pixels.