Acoustic transducer

Claim 1

An acoustic transducer including a piezoelectric element comprising: a frame body having a space defined by a flat bottom portion of a predetermined area, a side frame connected with the peripheral edge of the bottom portion and a flange formed integrally with the free end of the side frame, a cushioning means having a bottom face and a top face, said bottom and top faces having an adhesive layer formed thereon prior to the assembly of said acoustic transducer, the bottom face thereof being fitted on the upper surface of the bottom portion, a piezoelectric element mounted on the top face of the cushioning means, and a speaker diaphragm with an apex having an axially movable portion formed in a conical form in cross-section along the axis, the apex portion of the diaphragm being attached to the central portion of the upper face of the piezoelectric element, wherein said cushioning means has an outer diameter equal to or less than the diameter of the flat bottom face of the frame body and wherein said cushioning means is adhered onto the top face of the bottom portion of the frame body by means of the adhering layer formed on the bottom face thereof and said cushioning means is adhered to the piezoelectric element by means of the adhering layer formed on the top face thereof such that the apex portion of the speaker diaphragm is secured to the central portion of the piezoelectric element, said piezoelectric element having been previously secured to said cushioning means, with the peripheral edge of the speaker diaphragm being secured to the flange of the frame body, said cushioning means further includes at least one cut portion and/or through hole thereby decreasing the energy absorbed in the cushioning means from the piezoelectric element.