Patent ID: 8456060

Claim:
A vibrating element apparatus including: a wall section having an inner surface and an outer surface; a diaphragm defining, 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; a stack comprised of components which include one or more piezoelectric elements, said stack being located within said hollow body; and a compression device operable to compress said stack against the inner surface of said diaphragm; wherein said apparatus further includes a carrier which houses said stack and said compression device, said carrier being configured to fix the position of said stack with respect to said hollow body yet allow said compression device to rotate with respect to said stack ( 22 ), said carrier, said stack and said compression device being engageable with, and dis-engagement from said hollow body as a sub-assembly.