PROBLEM TO BE SOLVED: To provide an ultrasonic diagnostic apparatus which can be easily manufactured at a low cost, and includes an individual control function of a voltage applied to a vibrator.SOLUTION: An ultrasonic diagnostic apparatus which outputs pulse signals respectively to a plurality of vibrators to make the vibrators emit ultrasonic waves, and acquires reception signals based on the ultrasonic waves received by the vibrators, includes: a signal generation unit for generating a pulse signal with a predetermined voltage amplitude a plurality of amplitude adjustment units for individually changing the voltage amplitudes of the pulse signals output to the plurality of vibrators and a control unit for outputting control signals so as to respectively control change amounts of the voltage amplitudes. Each of the amplitude adjustment units includes a plurality of resistance elements and a switching section for respectively controlling voltages applied to the plurality of resistance elements. The control unit changes loads of the amplitude adjustment units by outputting the control signals for setting the combination of on and off by a switching section to apply the pulse voltage according to the amplitude of the ultrasonic wave emitted from each of the vibrators to the vibrators.COPYRIGHT: (C)2014,JPO&INPIT【課題】低コスト且つ容易に製造可能な、振動子への印加電圧の個別制御機能を備えた超音波診断装置を提供する。【解決手段】複数の振動子にそれぞれパルス信号を出力して超音波を発信させると共に、振動子が受信した超音波に基づく受信信号を取得する超音波診断装置であって、所定の電圧振幅でパルス信号を生成する信号生成部と、複数の振動子に出力するパルス信号の電圧振幅を個別に変更する複数の振幅調整部と、電圧振幅の変更量をそれぞれ制御する制御信号を出力する制御部と、を備え、振幅調整部の各々は、複数の抵抗素子と、これら複数の抵抗素子にかかる電圧をそれぞれ制御するスイッチング部とを有し、制御部は、スイッチング部によるオンオフの組み合わせを設定する制御信号を出力して振幅調整部の負荷を変化させることで、振動子の各々から発信させる超音波の振幅に応じた前記パルス電圧を振動子に印加する。【選択図】図3
