Light detecting apparatus of improved resolution

A light detecting apparatus of improved resolution comprising a plurality of light receiving elements arranged at a predetermined relative spacing in a row and producing detection output signals when said light receiving elements receive light, means for projecting a light beam upon said light receiving elements, a plurality of sequentially ordered logical produce circuits, each of said logical product circuits provided for every pair of adjacent light receiving elements and connected to receive the detection output signals of said pair of adjacent light receiving elements to produce an output signal only when said pair of adjacent light receiving elements are simultaneously irradiated by said light beam, wherein said detection output signals and output signals of said logical product circuits are an odd number of sequentially ordered signals, and a detection signal selection circuit connected to said light receiving elements and to said logical product circuits to respond to said detection output signals and said output signals of said logical product circuits to select from one of said plurality of light receiving elements said one light receiving element being irradiated by the center of said light beam, by selectively gating out a center signal of said odd number of sequentially ordered signals of said detection output signals and said output signals of said logical product circuits.