PROBLEM TO BE SOLVED: To provide an ultrasonic probe capable of preventing increase of a circuit scale and achieving miniaturization and weight reduction.SOLUTION: An ultrasonic probe 1 includes: a vibrator 3 a preamplifier 4 whose input side is connected to the vibrator side and output side is connected to the side of a transmission/reception part 2 for transmitting and receiving transmission signals and reception signals a transmission bypass part 7 connected between the transmission/reception part and the vibrator, for making the transmission signals pass through and shutting off the reception signals and a floating part 31 connected between the power supply terminal of the preamplifier and a first power supply, for turning the bias potential of the preamplifier to an electrically floating state when the transmission signals are transmitted, and turning the bias potential to an electrically non-floating state when the reception signals are received.COPYRIGHT: (C)2013,JPO&INPIT【課題】回路規模の増大を防ぎ、小型化及び軽量化を実現することができる超音波探触子を提供する。【解決手段】超音波探触子1は、振動子3と、前記振動子側に入力側が接続され、送信信号及び受信信号を送受信する送受信部2側に出力側が接続されるプリアンプ4と、前記送受信部と前記振動子との間に接続され、前記送信信号を通過させて前記受信信号を遮断する送信バイパス部7と、前記プリアンプの電源端子と第1の電源との間に接続され、前記送信信号の送信時に、前記プリアンプのバイアス電位を電気的にフローティング状態にし、前記受信信号の受信時に、前記バイアス電位を電気的に非フローティング状態にするフローティング部31とを備える。【選択図】図1
