Apparatus for securing a ferroelectric stack to a weighted projection surface

Claim 1

In an elestroacoustic transducer including a stack of ferroelectric cylinders held between a head mass and a tail mass, an improvement therefor is provided comprising: means for coupling said head mass and tail mass to the ferroelectric stack and being bonded onto opposite axial extremes of said ferroelectric stack; a liquid adhesive coated onto surfaces formed on said head mass and said tail mass each configured to mate with axially exposed surfaces of the coupling means; a plurality of hollow microspheres disposed in said liquid adhesive maintaining the separation of said axially exposed surfaces from said head mass and said tail mass a distance equal to the diameter of said microspheres thereby providing a thin line rigid joint and further improving impedance matching. a film of silicone compound disposed on said axially exposed surfaces for inhibiting the bonding of said liquid adhesive thereto; and means connected between said head mass and said tail mass for exerting a compressional force on said ferroelectric stack to prevent the generation of self-destructive tensile stresses when applying high driving potentials and for squeezing out excess said liquid adhesive while still plastic, after the hardening and curing thereof, adjacent nonrigid joints are created across the silicone compound films to block the transfer of destructive stresses to the stack caused by the reaction of said stack, said head mass and said tail mass to ambient temperature and pressure changes.