| 摘要 |
PURPOSE:To obtain a ultrasonic probe which can execute easily working, drawing-round of an electrode and handling without necessitating a delaying circuit by providing an acoustic lens on the ultrasonic radiation surface of a ring-like ultrasonic vibrator which is on a concentric circle against a disk-like ultrasonic vibrator and in which the ultrasonic radiation surface is in the same plane. CONSTITUTION:An ultrasonic transmission/reception element 1 is constituted of a disk-like ultrasonic vibrator 2-1, a ring-like ultrasonic vibrator 2-2 which is on a concentric circle thereto, and also, in which the ultrasonic radiation surface is in the same plane, and an acoustic lens 3 which is placed on their ultrasonic radiation surface, and has a geometric focus for converging an ultrasonic wave to one point. For instance, in an area where a distance in the radiation direction on the ultrasonic radiation surface is father than 70mm, transmission and reception are executed by both of the disk-like ultrasonic vibrator 2-1 and the ring-like ultrasonic vibrator 2-2, and in an area where the distance is nearer than 70mm, transmission/reception is executed by only the disk-like ultrasonic vibrator 2-1, by which transmission/reception of high resolution can be executed in a wide area. |
