Piezoelectroacoustic transducer e.g. for hearing aid, has piezoelectric ceramic layers forming laminate with main surface electrodes, internal electrode, and resin layer covering entire front and rear of laminate

摘要

The device has piezoelectric ceramic layers forming a laminate with main surface electrodes (21a) on its front and rear surfaces, an internal electrode between corresponding ceramic layers and all ceramic layers are polarized in the same direction. Flexural oscillations are induced by an alternating signal applied between the main and internal electrodes and a resin layer is arranged to cover the entire front and rear surfaces of the laminate.