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 |
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.
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