{TAIL ~ Notches} are cut out in the ultrasonic transducer material to divide it into a plurality of transducer elements arranged in {HEAD ~ the array direction} and a direction perpendicular to the array direction 
{ TAIL ~ Notches } are cut out in the ultrasonic transducer material to divide it into a plurality of transducer elements arranged in { HEAD ~ the array direction } and a direction perpendicular to the array direction
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH