Patent ID: 8492957

Claim:
An apparatus for generating electric energy comprising: a vibration plate; a supporting board; one side-wall unit constructed between said vibration plate and said supporting board, and making one sealed cavity together with said vibration plate and said supporting board; and at least one piezoelectric substrate existing in said sealed cavity in a way that at least one surface-spot of said at least one piezoelectric substrate is bonded to said supporting board via at least one adhesive mass, and said at least one piezoelectric substrate is not attached to said vibration plate, wherein said at least one piezoelectric substrate has a first- and a second end surfaces that is vertical to the thickness direction thereof and is covered with a first- and a second electrodes, respectively, said at least one piezoelectric substrate and said sealed cavity forming one cavity resonator, said vibration plate catching a sound pressure from the outside, and causing an acoustic vibration in its own, and then making a resonance vibration in said cavity resonator, said at least one piezoelectric substrate responding collectively to said resonance vibration induced in said cavity resonator, and delivering, through said first- and second electrodes, a resonance energy occurred in said cavity resonator as an electric energy.