Patent ID: 7864629

Claim:
A LWD logging tool acoustic transmitter comprising: a first and a second disc assembly each comprising a plurality of piezoelectric discs, and a clamping mechanism cooperating with a first end cap and a second end cap to exert a compressional force upon said disc assembly; and an arch-shaped mass; wherein said at each said disc assembly is disposed in a pressure housing in a recess in an outer surface defining a wall of said logging tool; said discs are polarized and configured physically and electrically to emit a pressure pulse from each said disc in a common direction upon application of a voltage to said at least one disc assembly; and each said disc assembly is disposed in said recess such that the axis of each said disc assembly is perpendicular to the major axis of said logging tool; wherein: axes of said first and said second disc assemblies are parallel and radially aligned; and a first end of said arch-shaped mass functions as said first end cap of said first disc assembly and a second end of said arch-shaped mass functions as said first end cap of said second disc assembly thereby acoustically coupling and mechanically connecting said first and said second disc assemblies.