Patent ID: 6744180
Filing Date: 2004-06-01
Classification: H04R

Abstract:
A piezoelectric electroacoustic transducer comprising:at least two electrodes; a substantially square piezoelectric diaphragm adapted to produce a bending vibration in a thickness direction thereof in response to application of an alternating voltage between the at least two electrodes; a housing for housing the piezoelectric diaphragm; an elastic sealant for sealing a gap between a periphery of the diaphragm and an inner side surface of the housing; supports, disposed in the housing, for supporting at least two mutually opposing sides of the piezoelectric diaphragm or four corners of the piezoelectric diaphragm; grooves which are disposed in the housing so as to face a periphery of the rear surface of the piezoelectric diaphragm and in which the elastic sealant is filled; and walls defining inner portions of the grooves, disposed such that the upper surfaces of the walls are located below those of the supports, for preventing the elastic sealant from flowing out to the bottom of the housing.