Patent ID: 8837025

Claim:
An image reading device comprising: a conveying unit for conveying an irradiated member in a conveying direction, the irradiated member having a surface with a hologram area; a first light source for applying light to an irradiated part in the hologram area; a second light source separated from the first light source along the conveying direction, to apply light to an irradiated part in the hologram area when the hologram area is conveyed by a prescribed distance from a position at which the hologram area is irradiated by the first light source, and provided so as to apply light to the irradiated part when the hologram area is conveyed by the prescribed distance at an irradiation angle different from an irradiation angle at which the irradiated part is irradiated with the light of the first light source, a magnitude of the irradiation angle of the second light source being different from a magnitude of the irradiation angle of the first light source; first and second rod lens arrays for respectively converging the lights of the first and second light sources reflected by the irradiated part in the hologram area, a respective optical axis of the first and second rod lens arrays being disposed orthogonal to the surface of the irradiated member; first and second sensors for receiving the lights respectively converged by the first and second rod lens arrays to photoelectrically convert the lights; and a checking unit for comparing output signals of the first and second sensors with each other to check whether a hologram in the hologram area of the irradiated member is true or false.