PIEZOELECTRIC SOUND-GENERATING BODY AND ELECTRONIC DEVICE USING THE SAME

摘要

A piezoelectric drive element includes piezoelectric layers, electrode layers between the piezoelectric layers, and electrode layers as the surfaces of the laminated layers. The piezoelectric layers are arranged on the upper side and on the lower side with reference to the center in the thickness direction, and are polarized in opposite directions. The thicknesses of piezoelectric layers at the center which have the least displacement are the thickest. The thicknesses of the piezoelectric layers above and under the thickest piezoelectric layers decrease gradually in an outward direction. A piezoelectric sound-generating body is constructed by affixing the piezoelectric driving element to a support plate and supporting the piezoelectric driving element with a frame.

主权项

1. A piezoelectric sound-generating body using a piezoelectric driving element constituted by a laminate of multiple piezoelectric layers, wherein: an electrode layer is formed between the multiple piezoelectric layers; the piezoelectric layer in an area associated with a smallest displacement of the piezoelectric driving element is a thickest among the piezoelectric layers; and other piezoelectric layers have thickness becoming gradually thinner in a lamination direction from the thickest piezoelectric layer.