US 12,354,429 B2
Optical sensor, paper sheet identification device, paper sheet processing device, and light detection method
Daiki Takehara, Himeji (JP); and Naoki Ueyama, Himeji (JP)
Assigned to GLORY LTD., Himeji (JP)
Filed by Glory Ltd., Himeji (JP)
Filed on May 12, 2023, as Appl. No. 18/196,442.
Application 18/196,442 is a continuation of application No. PCT/JP2021/041020, filed on Nov. 8, 2021.
Claims priority of application No. 2020-190305 (JP), filed on Nov. 16, 2020.
Prior Publication US 2023/0282053 A1, Sep. 7, 2023
Int. Cl. G07D 7/12 (2016.01); G01N 21/27 (2006.01); G01N 21/64 (2006.01); G06V 10/56 (2022.01)
CPC G07D 7/12 (2013.01) [G01N 21/27 (2013.01); G01N 21/645 (2013.01); G06V 10/56 (2022.01)] 8 Claims
OG exemplary drawing
 
1. An optical sensor that detects light from a sheet on which is printed at least one type of single-color ink among first to n-th n types of single-color inks that emit lights having wavelength bands different from one another, wherein n is an integer of 3 or greater, the optical sensor comprising:
a light source;
a light receiver including first to (n-1)th light-receiving elements respectively capable of selectively receiving lights emitted from the first to (n-1)th single-color inks among the first to n-th single-color inks and capable of receiving light emitted from the n-th single-color ink;
a memory configured to store a correction value based on reference data obtained by receiving lights emitted from the first to n-th single-color inks individually in the light receiver by type of single-color inks; and
a controller configured to correct detection data with the correction value, the detection data obtained by receiving, in the light receiver, light emitted from a sheet irradiated with light from the light source, wherein
the correction value is based on a matrix A with n rows and n columns represented by the following Formula (1):

OG Complex Work Unit Math
where a matrix element Axy is an output value of an x-th light-receiving element when light emitted from a y-th single-color ink among the first to n-th single-color inks is received alone in the light receiver, x is an integer of 1 or greater and (n−1) or smaller, and y is an integer of 1 or greater and n or smaller.