Patent ID: 8390177

Claim:
A vibrating element apparatus including: a wall section having inner surfaces and an outer surface; a diaphragm formed integrally with, and closing one end of, said wall section, said diaphragm having an inner surface and an outer surface, the inner surfaces of said wall section and said diaphragm defining a hollow body; one or more vibrating elements extending from the outer surface of said diaphragm; one or more piezoelectric elements located within said hollow body; and a compression device operable to compress said one or more piezoelectric elements against the inner surface of said diaphragm; said apparatus being characterised in that it includes a separate cage located within said hollow body, inwardly spaced from said wall section, to serve as a mount for said compression device, said cage having a plurality of spaced legs which are splayed outwardly into contact with, and fixed to, the inner surface of said wall section adjacent to the junction between said wall section and said diaphragm.