(under subclass 321) Subject matter in which the resonant structure is a diaphragm mechanically associated with the piezoelectric element, the combination being resonant at the operating frequency of the piezoelectric element.
SEE OR SEARCH THIS CLASS, SUBCLASS:
328, for the combination of a diaphragm driven by a piezoelectric element which diaphragm is not resonant with respect to the operating frequency at the element.
SEE OR SEARCH CLASS
181, Acoustics,
148+, for acoustical devices which use diaphragms.
340, Communications: Electrical, 338, for a noise generator which may include a piezoelectric element mounted on a diaphragm.
