Paper sheet identification device and paper sheet identification method

A paper sheet recognition apparatus, comprising:

• a transport path on which paper sheets are transported;
• a first sensor which is opposed to one of faces of each paper sheet being transported, and performs detection in a first recognition zone of the transport path;
• a second sensor which is opposed to the other face of each paper sheet being transported, and performs detection in a second recognition zone of the transport path;
• and
• a sensor controller which controls the first and second sensors, wherein
• the first sensor includes
• a first light emission unit and a second light emission unit which emit rays of light from mutually different directions to the first recognition zone,
• a first optical sensor which detects light reflected from the paper sheet in the first recognition zone, and
• a third light emission unit which emits light to the second recognition zone,
• the second sensor includes
• a second optical sensor which detects light transmitted through the paper sheet in the second recognition zone,
• the sensor controller controls operations of the first and second sensors, the operations being divided into a plurality of phases,
• the plurality of phases includes
• a first phase in which the first light emission unit emits light, the second light emission unit emits no light, and the first optical sensor detects reflective light, and
• a second phase in which the first light emission unit emits no light, the second light emission unit emits light, and the first optical sensor detects reflective light, and
• in at least one of the first phase or the second phase, the third light emission unit emits light, and the second optical sensor detects transmissive light.