Patent ID: 7764804

Claim:
An exciter for a panel-type loud speaker, comprising: a bimorph and a bimorph holding member, said bimorph comprising: an elongated plate member having opposite sides; and a pair of elongated piezoelectric ceramic layers, each formed on said opposite sides of said plate member, wherein said plate member includes an extension which is positioned in one end of said bimorph in a longitudinal direction thereof and extends longitudinally beyond said pair of piezoelectric ceramic layers sandwiching said plate member therebetween; said bimorph holding member comprising: a bimorph end holding portion for holding said one end of said bimorph, which comprises: a three-layer embedded section embedding said pair of piezoelectric ceramic layers and said plate member sandwiched therebetween at said one end of said bimorph, and an extension embedded section in which said extension of said plate member is embedded except for a tip end thereof, which extends out of the extension embedded section; and a mounting protrusion protruding from said bimorph end holding portion, wherein said mounting protrusion comprises: a proximal end connected to said extension embedded section at a position longitudinally apart from said three-layer embedded section by a predetermined distance and adjacent to said tip end of said extension of said plate member, and a distal end adapted to be connected to a diaphragm of a panel-type loud speaker so that said bimorph is positioned with a space interposed between said bimorph and said diaphragm.