US 12,474,471 B2
Light detection sensor, light detection device, and paper sheets processing device
Hiroshi Konishi, Hyogo (JP); Takeshi Sato, Hyogo (JP); and Yuuichirou Okui, Hyogo (JP)
Assigned to GLORY LTD., Himeji (JP)
Appl. No. 17/043,080
Filed by Glory Ltd., Himeji (JP)
PCT Filed Mar. 7, 2019, PCT No. PCT/JP2019/009175
§ 371(c)(1), (2) Date Sep. 29, 2020,
PCT Pub. No. WO2019/188096, PCT Pub. Date Oct. 3, 2019.
Claims priority of application No. 2018-068259 (JP), filed on Mar. 30, 2018.
Prior Publication US 2021/0018622 A1, Jan. 21, 2021
Int. Cl. G01S 17/04 (2020.01); G01J 1/02 (2006.01); G01J 1/42 (2006.01); G01S 7/4863 (2020.01)
CPC G01S 17/04 (2020.01) [G01J 1/0228 (2013.01); G01J 1/4228 (2013.01); G01S 7/4863 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A light detection sensor for use in a sheet processing apparatus that performs a sheet recognition processing, the light detection sensor comprising:
a light source configured to radiate light to a detection object attached to a sheet; and
a light receiver comprising a plurality of detectors configured to detect intensity of light from the detection object, wherein
the plurality of detectors comprises a first detector configured to detect intensity of light of a first wavelength band, and a second detector configured to detect intensity of light of a second wavelength band different from the first wavelength band,
a first sensitivity of the first detector to the light of the first wavelength band is lower than a second sensitivity of the second detector to the light of the second wavelength band,
a first light receiving area of the first detector is larger in size than a second light receiving area of the second detector,
sizes of the first light receiving area and the second light receiving area are adjusted to correct a variation in sensitivities of the first and second detectors and to compensate for the first sensitivity being lower than the second sensitivity, and
a size of the first light receiving area of the first detector is set in accordance with an emission intensity of the light radiated by the detection target, and a distance between the light detection sensor and the detection object.