Patent ID: 8345326

Claim:
A bill processing machine comprising: an element array portion which is arranged so as to face one side of a conveyance path of a bill, and including a light receiving element group, a light emitting element and an other side light receiving element, the light receiving element group including a plurality of light receiving elements, an arrangement direction of the light receiving elements being perpendicular to a conveyance direction of a bill, the light receiving element group, light emitting element and the other side light receiving element being aligned along the arrangement direction of the light receiving elements, so that the light emitting element and the other side light receiving element sandwich the light receiving element group therebetween; and a light guiding member which is arranged opposite to the element array portion with respect to the conveyance path so that the light guiding member and the element array portion sandwich the conveyance path therebetween, the light guiding member including a first refracting portion, a second refracting portion and a main body portion, the first refracting portion being positioned to refract irradiated light of the light emitting element in a direction parallel to the arrangement direction, the second refracting portion being positioned to refract the irradiated light refracted by the first refracting portion toward the other side light receiving element, and the main body portion being constructed and positioned to substantially uniformly diffuse the irradiated light refracted by the first refracting portion toward the light receiving element group.