Patent ID: 8344598

Claim:
A piezoelectric power generation device comprising: a spiral-shaped piezoelectric element having a center-side end and an outer-side end; a first fixing member to which the center-side end of the piezoelectric element is fixed; and a second fixing member to which the outer-side end of the piezoelectric element is fixed, the piezoelectric element including: a first spiral-shaped piezoelectric body; a first electrode disposed on a first surface of the first piezoelectric body; a second electrode disposed on a second surface of the first piezoelectric body opposite the first surface; and a spiral-shaped member disposed on one of the second electrode and the first electrode, wherein a first portion of the first piezoelectric body, which is located on one side of a line passing a center of the piezoelectric element and the outer-side end of the piezoelectric element, is polarized in the radial direction of the piezoelectric element from one side toward the other side thereof, and a second portion of the first piezoelectric body, which is located on the other side of the line passing the center of the piezoelectric element and the outer-side end of the piezoelectric element, is polarized in a direction opposite to the first portion, and wherein the first and second fixing members are arranged such that the second fixing member is displaceable relative to the first fixing member in a direction in which the line passing the center of the piezoelectric element and the outer-side end of the piezoelectric element extends, and the second fixing member is restricted from displacing relative to the first fixing member in a direction tangential to the outer-side end of the piezoelectric element.