Image reading device, image forming apparatus, non-transitory computer readable medium storing image reading program, and image reading method comprising a switching mechanism to switch the traveling of light from a light source to an optical path directly irradiating a document or via a traveling change member

Abstract

An image reading device includes a single light source that irradiates an image reading target with light, a traveling change member that changes a traveling direction of the light from the light source and irradiates the image reading target with the light at an incidence angle different from an incidence angle of the light directly applied from the light source to the image reading target, and a switching mechanism that switches traveling of the light from the light source to an optical path for directly irradiating the image reading target or an optical path for irradiating the image reading target via the traveling change member.