US 11,693,347 B2
Image forming apparatus
Atsunobu Mori, Shizuoka (JP); Yohei Suzuki, Shizuoka (JP); Seiji Hara, Shizuoka (JP); Yasuhisa Matsumoto, Shizuoka (JP); Junya Azami, Shizuoka (JP); Masafumi Monde, Kanagawa (JP); Hirotaka Shiomichi, Kanagawa (JP); and Tatsuya Hotogi, Shizuoka (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Jun. 9, 2022, as Appl. No. 17/836,512.
Application 17/836,512 is a continuation of application No. 17/213,046, filed on Mar. 25, 2021, granted, now 11,385,587.
Claims priority of application No. 2020-066952 (JP), filed on Apr. 2, 2020; and application No. 2021-032040 (JP), filed on Mar. 1, 2021.
Prior Publication US 2022/0299924 A1, Sep. 22, 2022
Int. Cl. G03G 15/00 (2006.01); H04N 1/00 (2006.01)
CPC G03G 15/55 (2013.01) [G03G 15/5029 (2013.01); H04N 1/00029 (2013.01); H04N 1/00042 (2013.01); H04N 1/00079 (2013.01); G03G 2215/00637 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An image forming apparatus configured to form an image on a recording material, comprising:
a transmission unit configured to transmit an ultrasonic wave toward a conveyance path along which the recording material is conveyed;
a reception unit disposed at a position opposite to the transmission unit with respect to the conveyance path, and configured to receive a sound wave or the ultrasonic wave; and
a control unit configured to switch between a first detection mode and a second detection mode within a time period in which the recording material passes between the transmission unit and the reception unit;
wherein the reception unit is configured to receive the sound wave and output a first reception signal to the control unit in the first detection mode, and to receive the ultrasonic wave and output a second reception signal to the control unit in the second detection mode.