Image reading apparatus having a function for correcting dark signals generated in a photoelectric conversion element

摘要: An image reading apparatus includes a photoelectric conversion element which has plurality of cells, the cells including shielded are optically so that each cell outputs only dark signal, signal data generating system for element, corresponding to ratio an output from under no-exposure condition first reference is obtained based on signals condition, memory storing cell, component product multiplied by second exposure and subtracter subtracting condition.