PROBLEM TO BE SOLVED: To provide an ultrasonic diagnostic apparatus and an ultrasonic probe capable of outputting transmission signals at various voltage levels from a transmission circuit with a small scale to an ultrasonic vibrator.SOLUTION: An ultrasonic diagnostic apparatus includes a transformer, a positive voltage power source, a negative voltage power source, and a changeover part. The transformer includes a primary coil and a secondary coil, and drives an ultrasonic vibrator on the basis of the voltage generated in the secondary coil. The changeover part generates changed voltage in the secondary coil by switching a connection path between the primary coil and the positive voltage power source or the negative voltage power source, or both of the positive and negative voltage power sources to a first connection path in which the positive voltage power source is connected to one end of the primary coil and the negative voltage power source is connected to the other end of the primary coil, a second connection path in which the positive voltage power source is connected to the other end and the negative voltage power source is connected to the one end, a third connection path in which the one end and the other end are short-circuited, or a ground connection path in which the positive voltage power source or the negative voltage power source and the ground are connected via the primary coil.COPYRIGHT: (C)2015,JPO&INPIT【課題】小さな規模の送信回路から多様な電圧レベルの送信信号を超音波振動子へ出力することができる超音波診断装置及び超音波プローブを提供する。【解決手段】超音波診断装置は、トランスと、正電圧電源と、負電圧電源と、切替部とを有する。トランスは、1次巻線及び2次巻線を備え、2次巻線に発生した電圧に基づいて超音波振動子を駆動する。切替部は、1次巻線と正電圧電源若しくは負電圧電源又はこれら双方との接続経路を、1次巻線の一端に正電圧電源を接続し1次巻線の他端に負電圧電源を接続する第1の接続経路、他端に正電圧電源を接続し一端に負電圧電源を接続する第2の接続経路、一端と他端とを短絡させる第3の接続経路、又は正電圧電源若しくは負電圧電源とグランドとを1次巻線を介して接続させるグランド接続経路に切り替えることによって、2次巻線に電圧を変化させて発生させる。【選択図】図2
