A structure comprises a piezoelectric ceramics plate formed by two plate-shaped piezoelectric ceramics elements which are layered and joined to each other with inverse polarization, in which electricity is generated by beating one or both surface of the piezoelectric ceramics plate. Therefore, an excellent...http://www.google.de/patents/US6411016?utm_source=gb-gplus-sharePatent US6411016 - Piezoelectric generating apparatus
