Patent ID: 9091983
Filing Date: 2015-07-28
Classification: G03G

Abstract:
1. A recording material detecting apparatus, comprising: a first light source that emits first light; a second light source that emits second light; a light guiding unit that allows the first light and the second light to enter a surface of a recording material respectively in two directions which are not parallel when viewed in a normal line direction of a surface of the recording material; an imaging device that images an area where the first light is irradiated and an area where the second light is irradiated on the surface of the recording material; and an output device that outputs information on a surface condition of the recording material based on an output of the imaging device, wherein the second light source is a light source of a type which is the same as that of the first light source, and wherein when viewed in a direction along center optical axes of the first light source and the second light source, the first light source and the second light source are arranged such that respective reference lines of rotational phases around the center optical axes are rotated in opposite directions by approximately the same angles from a line perpendicular to a direction in which the first light source and the second light source are arrayed.