OPTICAL SENSOR AND IMAGE FORMING APPARATUS

摘要

An optical sensor includes a light source; and an optical detector detecting intensity of light that is reflected by a recording medium, the light from the light source and irradiated onto the recording medium. Further, when an incident angle of the light incident the recording medium from the light source relative to a normal line of the recording medium is given as &thetas;1, a formula 75°≦̸&thetas;1≦̸85° is satisfied.