PURPOSE: To attain sharp directivity, excellent transmission and reception sensitivity and excellent pulse performance, by placing a thin plate having a plurality of open holes near the front of output side of an electroacoustic converter.
CONSTITUTION: A coupling shaft 12 is arranged at the center of a sticked type piezoelectric element 11 and a diaphragm 13 is fitted to the shaft 12. The piezoelectric element 11 is fixed by bonding the node of the oscillation with an adhesives 15 having the elasticity to the tip of a support stand 14. In front of the diaphragm 13, the thin plate 23 having a circular open hole 22 and other open hole 22' provided on the concentric circle taking a straight line through the opening 22 and the coupling shaft 12 as a center. Thus, the ultrasonic wave transceiver having the sharp directivity, excellent transmission/reception characteristics and excellent pulse characteristics is obtained.
TAKAYAMA RIYOUICHI
UESHIBA NOZOMI
ISE YUKIHIKO
