Patent ID: 8774653
Filing Date: 2014-07-08
Classification: G03G

Abstract:
1. A recording medium determination apparatus that determines a recording medium by using an ultrasonic wave, comprising: a transmission unit configured to output an ultrasonic wave having a predetermined frequency; a reception unit configured to receive the ultrasonic wave output from the transmission unit and via the recording medium, and output a received signal according to the ultrasonic wave via the recording medium; a calculation unit configured to calculate a signal having a peak component according to a cycle of the received signal; a determination unit configured to determine the recording medium based on the signal calculated by the calculation unit; and a signal output unit configured to output a driving signal for transmitting the ultrasonic wave having the predetermined frequency from the transmission unit, wherein a detection period is set to be a predetermined period after a time corresponding to an integer-multiple cycle period of the driving signal has elapsed since the signal value calculated by the calculation unit has exceeded a threshold value.