Patent ID: 7019437
Filing Date: 2006-03-28
Classification: H02N

Abstract:
1. A high efficiency piezoelectric single phase uni-polar ultrasonic actuator comprising: an upper and lower pair of back discs, a PZT plate interposed between said upper and lower back discs, an electrode formed on said PZT plate, a pivotal bolt extending through said upper and lower pair of back discs, and said PZT plate, and a fixing nut secured to one end of said pivotal bolt, said actuator unit is being supported and fixed with said pivotal bolt and said fixing nut combination by passage of said pivotal bolt coaxially through the center of said actuator unit wherein parametric output variation of said actuator is carried out by asymmetrizing the structure of said actuator by a formation of at least one straight notch having a screw coupled to said upper disc within said notch on an edge of said upper disc such that after said electrode being energized, said actuator produces an unbalanced periodic output force.