Patent ID: 9581685
Date: 2017-02-28
CPC Classifications: B06B,G01S

Claim:
1. An ultrasonic diagnostic apparatus comprising: a plurality of transducers configured to irradiate an ultrasonic wave; a transmitter configured to drive the plurality of transducers; and a plurality of power sources configured to supply a plurality of positive voltages and negative voltages to the transmitter, wherein at least one voltage of either the plurality of positive voltages or the plurality of negative voltages has an absolute value different from any one of the plurality of the other voltages, wherein the transmitter comprises: wherein the timing controller is configured to turn ON/OFF an odd numbered switch and an even numbered switch of the plurality of switches alternately to generate a pulse-pair sequentially in a plurality of pulses, the pulse-pair including an even pulse and an odd pulse continuously next to the even pulse, a voltage of the odd pulse is driven with one of the plurality of positive voltages and negative voltages, a voltage of the even pulse is driven by another of the plurality of positive voltages and negative voltages different from the voltage of the odd pulse, and the absolute value of the voltage of the even pulse is different from the absolute value of the voltage of the odd pulse, and wherein when a final driving pulse in driving pulse trains for allowing the ultrasonic pulse to be output from the plurality of transducers has a voltage whose absolute value is higher than a predetermined value, the timing controller configured to add a driving pulse of opposite polarity whose absolute value is smaller than the predetermined value to the rear of the final driving pulse.