Piezoelectric adjusting element

TLDR: In this paper, a piezoelectric adjusting element is used to adjust the frequency of the standing longitudinal acoustic wave expanding through a piezolectric oscillator in the direction of the oscillator resonant length as well as its height.

Abstract: The invention relates to a piezoelectric adjusting element, in particular a piezoelectric motor in the form of a monolithic plate-shaped or cylindrical piezoelectric oscillator comprised of a first and of a second kind of main surfaces and of groups of electrodes that are allocated to them, comprised of a housing, a driven element, at least one friction layer arranged on the housing or on the driven element, a driving element that is connected to an electric excitation source and that is in friction contact with the friction layer, and the piezoelectric oscillator is excited by way of the groups of electrodes [to form] standing longitudinal acoustic waves in the direction of an oscillator resonant length and in the direction of an oscillator resonant height of this piezoelectric oscillator, and the oscillator resonant length is equal to an integral multiple of the wave length of the standing longitudinal wave that vibrates in its direction, and the oscillator resonant height is equal to one half of the wave length of the standing longitudinal wave that vibrates in its direction, and the oscillator resonant length as well as the oscillator resonant height are chosen in such a way that the frequencies of the standing longitudinal acoustic waves expanding through the piezoelectric oscillator are equal both in the direction of the oscillator resonant length as well as in the direction of the oscillator resonant height.