Patent ID: 6870304
Filing Date: 2005-03-22
Classification: H01L

Abstract:
1. A vibratory system for moving a driven element comprising: a vibratory element having a driving element in driving communication with a resonator that has a selected contacting portion located to engage the driven element during use of the system, the vibrating element and resonator being configured to move the selected contacting portion in a first elliptical motion when the resonator is excited to simultaneously resonate in at least two vibration modes by a first signal at a first frequency provided to the vibrating element, the resulting motion being of sufficient amplitude to move the driven element when the driven element and selected contacting portion are maintained in sufficient contact to achieve a desired motion of the driven element, the at least two vibration modes being selected so that at least one is not a pure longitudinal or bending mode of the resonator but is a combination of both pure longitudinal motion and pure bending motion components, wherein the piezoelectric element is held in compression by walls of the resonator that are stressed past their yield point, during operation of the system.