PIEZOELECTRIC TYPE ELECTROACOUSTIC TRANSDUCER

摘要

PURPOSE:To prevent discharge of a receiver by fitting the transducer while adhering the transducer closely to an annular projection at the inside of a handset receiver having a receiving hole via an electric insulation film fixed to the diaphragm. CONSTITUTION:A ceramic piezoelectric substance 33 is adhered to one face of the metallic diaphragm 32 of the vibrator 31 of the transducer 35 and the electric insulation film 45 is bonded to the other face. The front chamber pate 35 is provided to the vibrator 31 via the front chamber 34, the front chamber plate 35 is made of an electric insulator and the peripheral has a step. Moreover, the rear side plate 40 provided to the step difference so that a back pressure chamber 42 is provided inbetween the vibrator 31. The electric insulation film 45 fixed directly to the vibrator 31 or via a small space is provided, and the transducer 53 is fixed closely to the annular projection 60 of the handset receiver 51 having a receiving hole 52 and the business is in close contact with the ring form projection via a film 45.