Patent ID: 7678054

Claim:
An ultrasonic-diagnosing apparatus including an ultrasonic probe having a plurality of transducers, transmission means for transmitting an ultrasonic signal for driving the transducers of the ultrasonic probe, reception-processing means for performing reception processing for a reflective-echo signal received by the ultrasonic probe, image-processing means for reconstructing an ultrasonic image based on the reflective-echo signal processed by the reception-processing means, and image-display means for displaying the ultrasonic image reconstructed by the image-processing means, wherein the ultrasonic probe comprises an array of a plurality of ultrasonic transducers, wherein a piezoelectric layer of each of the ultrasonic transducers comprises a first piezoelectric layer which has one face serving as an ultrasonic-wave emission face, a second piezoelectric layer which is laminated on a face of the first piezoelectric layer opposite to the ultrasonic-wave emission face, a common electrode which is provided at a laminate boundary surface between the first piezoelectric layer and the second piezoelectric layer and to which the ultrasonic signal is transmitted, a first ground electrode which is provided on the ultrasonic-wave emission face to the first piezoelectric layer, and a second ground electrode which is provided on a back face of the second piezoelectric layer on the side opposite to the laminate boundary surface, and wherein, the ultrasonic-wave emission face and the back face are formed as either a plane face or a curved face and arranged in parallel with each other, a thickness of the first piezoelectric layer in a minor axis direction perpendicular to a major axis direction of the ultrasonic transducer is formed largest at a center part and smallest at each end, and a thickness of the second piezoelectric layer in the minor axis direction is formed smallest at a center part and largest at each end.