US 12,168,589 B2
Image reading apparatus, image forming apparatus, and image reading method
Yasushi Takatsuki, Osaka (JP)
Assigned to KYOCERA Document Solutions Inc., Osaka (JP)
Appl. No. 18/003,668
Filed by KYOCERA Document Solutions Inc., Osaka (JP)
PCT Filed Jun. 25, 2021, PCT No. PCT/JP2021/024108
§ 371(c)(1), (2) Date Dec. 28, 2022,
PCT Pub. No. WO2022/004587, PCT Pub. Date Jan. 6, 2022.
Claims priority of application No. 2020-111232 (JP), filed on Jun. 29, 2020.
Prior Publication US 2023/0312285 A1, Oct. 5, 2023
Int. Cl. B65H 7/02 (2006.01); H04N 1/00 (2006.01)
CPC B65H 7/02 (2013.01) [H04N 1/00718 (2013.01); B65H 2553/30 (2013.01); B65H 2553/414 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An image reading apparatus, comprising:
a sheet feed portion configured to feed a plurality of bonded sheets to a conveying path;
a sheet detection portion configured to transmit ultrasonic waves to the sheet at a predetermined measurement position on the conveying path and detect a voltage value corresponding to an intensity of received ultrasonic waves;
a light amount detecting portion configured to irradiate light onto the sheet and detect reflected light from the sheet at an image reading position for reading an image of the sheet;
a determination processing portion configured to determine whether or not a voltage difference between a voltage value of a first area of the sheet and a voltage value of a second area of the sheet excluding the first area is equal to or greater than a preset threshold value; and
an execution processing portion configured to adjust an amount of light emitted from the light amount detecting portion and irradiated onto the sheet in a case where the determination processing portion determines that the voltage difference is equal to or greater than the threshold value; wherein
the light amount detecting portion comprises a first light source arranged further on a conveying direction side than the image reading position, and a second light source arranged further on an opposite side to the conveying direction than the image reading position; and
in a case where the determination processing portion determines that the voltage difference is equal to or greater than the threshold value, the execution processing portion causes the amounts of light emitted from the first light source and the second light source and irradiated onto the sheet to differ from each other.