US 12,260,699 B2
Optical sensor, paper sheet identification device, and paper sheet processing device
Naoki Ueyama, Hyogo (JP); and Daiki Takehara, Hyogo (JP)
Assigned to GLORY LTD., Himeji (JP)
Filed by Glory Ltd., Himeji (JP)
Filed on Aug. 18, 2022, as Appl. No. 17/890,287.
Application 17/890,287 is a continuation of application No. PCT/JP2021/006122, filed on Feb. 18, 2021.
Claims priority of application No. 2020-025346 (JP), filed on Feb. 18, 2020.
Prior Publication US 2022/0392289 A1, Dec. 8, 2022
Int. Cl. G01N 21/64 (2006.01); G01N 21/86 (2006.01); G07D 7/121 (2016.01)
CPC G07D 7/121 (2013.01) [G01N 21/64 (2013.01); G01N 21/86 (2013.01); G01N 2021/6491 (2013.01); G07D 2207/00 (2013.01)] 21 Claims
OG exemplary drawing
 
1. An optical sensor that detects light reflected by a transported sheet and/or light transmitted through the sheet as well as light emitted from the sheet,
the optical sensor comprising:
a light source configured to irradiate a sheet with excitation light and detection light;
a controller configured to cause the light source to emit the detection light in a plurality of light-on periods and the excitation light at least one time, and keep the light source turned off during each of a plurality of light-off periods after the emission of the excitation light; and
a light receiver configured to receive light resulting from reflection of the detection light by a sheet and/or light resulting from transmission of the detection light through the sheet in each of the plurality of light-on periods and receive phosphorescence emitted from the sheet in each of the plurality of light-off periods,
the controller configured to generate data of one pixel by summing up a plurality of output values based on a plurality of respective phosphorescence components received by the light receiver in each of the plurality of light-off periods.