US 12,265,061 B2
Recording material detection device, image forming apparatus, and ultrasonic emission device
Masafumi Monde, Kanagawa (JP); Junya Azami, Shizuoka (JP); Hiromitsu Kumada, Shizuoka (JP); Ryuichi Araki, Chiba (JP); and Mayumi Sakai, Shizuoka (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Dec. 9, 2021, as Appl. No. 17/547,082.
Claims priority of application No. 2020-210444 (JP), filed on Dec. 18, 2020; and application No. 2020-210445 (JP), filed on Dec. 18, 2020.
Prior Publication US 2022/0196605 A1, Jun. 23, 2022
Int. Cl. G01N 29/11 (2006.01); G01B 17/02 (2006.01); G01N 29/36 (2006.01)
CPC G01N 29/11 (2013.01) [G01B 17/02 (2013.01); G01N 29/36 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A device comprising:
a sensor including an emission unit which emits ultrasonic waves and a reception unit which receives the ultrasonic waves, the emission unit and the reception unit being arranged opposite each other across a conveyance path through which a recording material is conveyed;
an instruction unit configured to input, to the emission unit, a first drive input for causing the emission unit to emit ultrasonic waves with a first maximum amplitude and a second drive input for causing the emission unit to emit ultrasonic waves with a second maximum amplitude larger than the first maximum amplitude; and
a detection unit configured to detect information about a grammage of the recording material based on a first value obtained by the reception unit receiving ultrasonic waves emitted from the emission unit with the first drive input supplied thereto and coming not through the recording material and a second value obtained by the reception unit receiving ultrasonic waves emitted from the emission unit with the second drive input supplied thereto and coming through the recording material.