Image reading device

摘要

An image reading device having a conveying unit for conveying an irradiated member that has a hologram area in a conveying direction; a first light source for applying light to an irradiated part in the hologram area; and a second light source separated from the first light source along the conveying direction and applying light to an irradiated part in the hologram area when the hologram area is conveyed by a prescribed distance. An irradiation angle at which the irradiated part is irradiated with the light of the first light source is made to be different from an irradiation angle at which the irradiated part is irradiated with the light of the second light source when the hologram part is conveyed by the prescribed distance. Lights reflected by the hologram area are respectively received to detect an electric signal of the hologram area of the irradiated member.

主权项

1. An image reading device comprising:
first and second image reading portions which are arranged to be vertically inverted with respect to each other and to face each other with an irradiated member, which is configured to be conveyed by a conveying unit in a conveying direction along a conveying path, provided therebetween, each of the first and second image reading portions including: a first light source for applying light to an irradiated part in a hologram area of the irradiated member; 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 area of the irradiated member is true or false, wherein the first light source of the first image reading portion applies light to a first position of the conveyance path, the second light source of the first image reading portion applies light to a second position of the conveyance path, the first light source of the second image reading portion applies light to a third position of the conveyance path, and the second light source of the second image reading portion applies light to a fourth position of the conveyance path, wherein the first position and the third position are spaced from each other in the conveying direction, and wherein the second position and the fourth position are spaced from each other in the conveying direction.