According to the above method, it is possible to transmit {TAIL ~ the ultrasonic wave} in such a manner that: the first combination of transmission elements is selected from among the multiple transmission elements so that the first combination of transmission elements includes at least two transmission elements adjacent to each other; and the transmission surfaces of the first combination of transmission elements vibrate in a substantially same phase so that the transmission surfaces of the first combination vibrate in {HEAD ~ an integral manner} 
According to the above method , it is possible to transmit { TAIL ~ the ultrasonic wave } in such a manner that : the first combination of transmission elements is selected from among the multiple transmission elements so that the first combination of transmission elements includes at least two transmission elements adjacent to each other ; and the transmission surfaces of the first combination of transmission elements vibrate in a substantially same phase so that the transmission surfaces of the first combination vibrate in { HEAD ~ an integral manner }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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