Piezoelectric ultrasonic transducer mounted in a housing

摘要

PCT No. PCT/JP80/00104 Sec. 371 Date Jan. 15, 1981 Sec. 102(e) Date Jan. 14, 1981 PCT Filed May 14, 1980.An ultrasonic transducer comprises a vibrating assembly having a thickness-poled piezoelectric ceramic disk (12) bonded concentrically to a resonant plate (13) of greater diameter than that of the ceramic disk (12), which having a radiator (30) is set in the center of the resonant plate (13) on the opposite surface to the ceramic disk (12), and which fitted onto a plastic baseplate (51) using such adhesive (52) as will retain elasticity after curing and accommodated within a housing (80) with a director (81) on top. The ultrasonic transducer has superior performance to conventional bimorph devices by 6 dB in terms of receiving sensitivity.