US 11,893,429 B2
Colorimetric device, image forming apparatus, and calibration method
Rie Suzuki, Kanagawa (JP); and Tatsuya Ishii, Kanagawa (JP)
Assigned to Ricoh Company, Ltd., Tokyo (JP)
Filed by Rie Suzuki, Kanagawa (JP); and Tatsuya Ishii, Kanagawa (JP)
Filed on May 19, 2023, as Appl. No. 18/320,539.
Claims priority of application No. 2022-095180 (JP), filed on Jun. 13, 2022.
Prior Publication US 2023/0401405 A1, Dec. 14, 2023
Int. Cl. G06K 15/02 (2006.01); B41J 2/21 (2006.01); G01N 21/25 (2006.01); G03G 15/01 (2006.01)
CPC G06K 15/027 (2013.01) [B41J 2/2103 (2013.01); G01N 21/251 (2013.01); G03G 15/0105 (2013.01); G01N 2201/127 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A colorimetric device comprising:
a white reference portion having:
a first irradiation area; and
a second irradiation area different from the first irradiation area;
a light emitter including:
a first light source configured to emit visible light to the first irradiation area; and
a second light source configured to emit ultraviolet light to the second irradiation area;
a sensor configured to detect the visible light reflected from the first irradiation area and the ultraviolet light reflected from the second irradiation area; and
circuitry configured to:
measure colorimetric information of an object; and
calibrate the colorimetric information of the object based on the visible light and the ultraviolet light detected by the sensor.