Haptic actuator with jig member configured to amplify piezoelectric element displacement

A haptic actuator comprising:

• a polygonal piezoelectric element formed to have a square shape and configured to generate a displacement thereof while expanding and contracting in accordance with polarities of a voltage applied thereto;
• and
• a jig member coupled to the polygonal piezoelectric element at upper and lower square sides of the polygonal piezoelectric element in a thickness direction of the polygonal piezoelectric element in a state of contacting only corner portions of the polygonal piezoelectric element and configured to amplify the displacement generated at the polygonal piezoelectric element, thereby vibrating;
• wherein the jig member comprises
• a center part disposed at a center of the jig member and spaced apart from the polygonal piezoelectric element, to vibrate, the center part is formed to have a circular shape;
• an edge part contacting each corner portion of the polygonal piezoelectric element, to receive mechanical energy generated due to the displacement generated by the piezoelectric polygonal element, wherein the edge part is formed to have a vertically bent shape such that the edge part conforms to each corner portion of the polygonal piezoelectric element;
• and
• a bridge part interconnecting the center part and the edge part, to transfer the mechanical energy received from the edge part to the center part and the bridge part is formed such that opposite longitudinal sides thereof are placed on tangent lines between opposite ends of the edge part in a thickness direction of the edge part and the center part, respectively.