Patent ID: 8875581

Claim:
An ultrasonic wave control device for determining a basis weight of a recording material, comprising: an ultrasonic wave transmitting unit configured to transmit an ultrasonic wave; an ultrasonic wave receiving unit configured to receive an ultrasonic wave; a driving signal transmitting unit configured to transmit a driving signal that has a predetermined number of pulses in order to cause the ultrasonic wave transmitting unit to transmit an ultrasonic wave; and a control unit configured to perform control to cause the ultrasonic wave transmitting unit to transmit an ultrasonic wave by using a driving signal that has a predetermined number of pulses, change the predetermined number of pulses in accordance with an ultrasonic wave via a recording material and that is received by the ultrasonic wave receiving unit, and cause an ultrasonic wave to be transmitted by using the driving signal in which the number of pulses has been changed, wherein the control unit sets a change quantity of the predetermined number of pulses in accordance with an ultrasonic wave received by the ultrasonic wave receiving unit.