Side edge detection device with multicolored light detection unit, image forming apparatus provided with the side edge detection device, side edge detection method using multicolored light detection unit and storage medium thereof

Abstract

An end position detection device includes a light emission unit including plural light sources for plural colors, respectively, each of the light sources being configured to emit line-like light of one of the colors which is long in a width direction to a conveyance object, the width direction being orthogonal to a conveyance direction of the conveyance object; a light reception unit including plural light reception elements, each configured to receive reflected light from the conveyance object and output a signal corresponding to a received amount of light, arranged in an array in the width direction; and a detection unit configured to detect an end position in the width direction of the conveyance object based on the signals output from the light reception elements in a case where the light sources for the respective colors simultaneously emit light to the conveyance object.