Light receiving sensor, sensor module, and paper sheet handling apparatus

A paper sheet handling apparatus including a sensor module that detects visible light and infrared light that pass through a paper sheet being transported or detects visible light and infrared light reflected from the paper sheet, and an image formation processing unit that forms an image relating to the paper sheet based on the visible light and the infrared light detected by the sensor module, wherein

• the sensor module includes
• a light emitting unit that emits light including at least the visible light and the infrared light;
• and
• a filter that receives reflected light from the paper sheet and transmissive light passed through the paper sheet while the light emitting unit emits light to the paper sheet being transported, and has
• a plurality of filter regions each of which allows visible light of a plurality of different wavelength bands to pass therethrough while blocking visible light of other wavelength bands and infrared light;
• and
• one or a plurality of filter regions each of which allows infrared light of one or a plurality of wavelength bands to pass therethrough while blocking visible light;
• a light receiving unit having a plurality of light receiving elements each of which detects visible light of the plurality of the different wavelength bands that pass through each of the filter regions, and detects infrared light of the one or the plurality of the different wavelength bands;
• and
• an outputting unit that outputs each light receiving data detected by the light receiving elements to the image formation processing unit
• wherein
• the light emitting unit provides a control to emit the visible light and the infrared light in a first light emitting timing so as to have an overlap, and irradiates an excitation light of a wavelength band different from the wavelength band of the visible light and the infrared light at a second light emitting timing different from the first light emitting timing, and
• the light receiving unit detects in the light receiving elements light emitted from the paper sheet in response to the irradiation of the excitation light by the light emitting unit.

A sensor module comprising:

• a light emitting unit that emits visible light and infrared light of a plurality of different wavelength bands to a sheet;
• a filter that includes
• a visible-light bandpass filter region that passes visible light of a predetermined wavelength band, and
• an infrared-light bandpass filter region that passes infrared light of a predetermined wavelength band;
• and
• a light receiving unit that detects light from the sheet via the filter;
• wherein
• during a first time period, the light emitting unit simultaneously emits the at least one visible light and an infrared light of a first wavelength band, and
• during a second time period different from the first time period, the light emitting unit simultaneously emits the at least one visible light and an infrared light of a second wavelength band different from the first wavelength band.