COMPOUND TYPE PIEZOELECTRIC TRANSDUCER ARRAY HAVING IMPROVEDACOUSTIC AND ELECTRIC IMPEDANCE

摘要

PROBLEM TO BE SOLVED: To provide a transducer element improving electric impedance matching for an ultrasonic imaging system and acoustic impedance matching for a human body. SOLUTION: The transducer element 230 for a transducer array in a small external dimension, which has 2-2 or 1-3 composite structure and which is driven at a k31 lateral mode, is provided. The transducer element 230 is provided with plural thin piezo ceramic wafers 235 where electrodes 240 and 242 are provided on a confronted main face. The wafers 235 which are mutually detached are separated by a passive polymer layer in composite structure.