Medium conveying apparatus in which reflectivity in periphery of opening for guiding light is equal to or less than predetermined ratio

A medium conveying apparatus capable of conveying a passport comprising:

• a roller movable according to a thickness of the conveyed passport;
• a guide pair including a first guide, and a second guide located to sandwich a medium conveyance path with the first guide there between, to regulate a vertical direction of the medium conveyance path;
• a light emitting element located on an outside of the medium conveyance path with one of the first guide or the second guide in between to detect the medium;
• a light receiving element located on the outside of the medium conveyance path with the first guide in between, to receive a light emitted by the light emitting element;
• and
• an opening provided in the first guide, to pass the light emitted from the light emitting element, wherein
• the light emitting element, the light receiving element and the opening are located on a downstream side of the roller in a medium conveying direction, wherein
• the first guide and the second guide are located apart from each other by the thickness of the conveyed passport or more at a position where the light emitting element, the light receiving element and the opening are located in the medium conveying direction, wherein
• a distance between the first guide and the second guide at a first position is larger than a distance between the first guide and the second guide at a second position on a downstream side of the first position, on an upstream side of the light emitting element and the light receiving element in the medium conveying direction, and wherein
• a reflectivity in a periphery of the opening of the first guide is 55% or less to absorb a disturbing light entering from a passport conveyance port or a passport discharge port formed by the first guide and the second guide, in the periphery of the opening of the first guide.