Patent ID: 8363863

Claim:
A piezoelectric speaker comprising: a laminated body having a plurality of polymer sheets, wherein at least one of the plurality of polymer sheets is a piezoelectric sheet having a predetermined stretching axis and composed of a chiral polymer; first and second electrodes positioned within a vibration region on opposing first and second main surfaces of the piezoelectric sheet, wherein at least one of the first and second electrodes is a divided electrode that includes a plurality of divided electrode portions, the plurality of divided electrode portions being separated by a plurality of dividing lines extending in a radiation direction, and the plurality of electrode portions being distributed along an outer peripheral portion of the vibration region except for a central portion, the plurality of dividing lines have any one of angles within a range of (1) 0 degrees or more and less than 40 degrees with respect to the stretching axis and (2) more than 50 degrees to 90 degrees or less with respect to the stretching axis.