Paper sheet identification device and paper sheet identification method
AssigneeGlory Ltd.
InventorsAkira Bogaki, Takahiro Yanagiuchi
Life of this patent
Estimating the term…
Abstract
A paper sheet recognition apparatus can generate a subtracted reflective light image without increasing detection time. To that end, the operations of sensors are controlled in a plurality of phases. The phases include a phase (reflected infrared light 1) in which a first light emission unit emits light, a second light emission unit emits no light, and an optical sensor detects reflective light. In another phase, (reflected infrared light 2) the first light emission unit emits no light, the second light emission unit emits light, and the optical sensor detects reflective light. In at least one of these phases, a light emission unit emits light, and an optical sensor detects transmissive light.
Claims11
A paper sheet recognition apparatus, comprising:
- a transport path on which paper sheets are transported;
- a first sensor which is opposed to a first face 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 a second 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 transmitted light.
A method for recognizing paper sheets using a paper sheet recognition apparatus,
- the paper sheet recognition apparatus including:
- a first sensor which is opposed to a first face of each paper sheet being transported on a transport path for transporting the paper sheets, and performs detection in a first recognition zone of the transport path;
- and
- a second sensor which is opposed to a second face of each paper sheet being transported on the transport path, and performs detection in a second recognition zone of the transport path;
- the first sensor includes
- a first light emission unit and a second light emission unit which emit rays of light in 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 method comprising:
- a first step of allowing the first light emission unit to emit light, the second light emission unit to emit no light, and the first optical sensor to detect reflective light;
- a second step of allowing the first light emission unit to emit no light, the second light emission unit to emit light, and the first optical sensor to detect reflective light;
- and
- a third step of allowing the third light emission unit to emit light, and the second optical sensor to detect transmitted light, the third step being performed simultaneously with at least one of the first step or the second step.
Dependencies are inferred from the claim text.