Patent ID: 9665050
Date: 2017-05-30
CPC Classifications: G01N,G03G

Claim:
1. A determination apparatus comprising: a transmission control unit including two terminals having a different polar character and configured to output a drive signal from the two terminals; a transmission unit including two terminals having a different polar character and configured to transmit an ultrasonic wave by input the drive signal to the two terminals; a reception unit including two terminals having a different polar character and configured to receive the ultrasonic wave transmitted from the transmission unit and to output a reception signal from the two terminals in accordance with the received ultrasonic wave; a reception control unit including two terminals having a different polar character and the two terminals being input the reception signal output from the reception unit, and a control unit configured to: judge, based on the reception signal output from the reception control unit, whether or not a predetermined state occurs in which the two terminals of the transmission control unit are connected to the two terminals of the transmission unit so that each of the polar characters matches and the two terminals of the reception control unit are connected to the two terminals of the reception unit so that each of the polar characters mismatches, or the two terminals of the transmission control unit connected to the two terminals of the transmission unit so that each of the polar characters mismatches and the two terminals of the reception control unit are connected to the two terminals of the reception unit so that each of the polar characters matches; and reverse a waveform of the reception signal in a case that the control unit judges that the predetermined state has occurred; and determine a type of a recording medium based on an amplitude of the reception signal of which the waveform is reversed by the control unit, the reception signal being acquired during the recording medium conveyed between the transmission unit and the reception unit.