Vibration transducer assembly

A vibration transducer assembly for sensing vibrations in a selected frequency range comprising:

• (a) body means adapted to receive vibratory movement from external structure and defining a stanchion thereon;
• (b) a rigid resonatable disc generally thin with respect to its diameter, said disc centrally supported on said stanchion in overhanging arrangement, said disc having an annular stiffening portion formed integrally therein intermediate said stanchion and the periphery of said disc, said stiffening portion having in transverse section a generally rectangular configuration with the portion radially outwardly of said stiffening portion offset from the central portion;
• (c) a piezoelectric member bonded to the surface of said resonatable disc and disposed centrally within said stiffened portion;
• and,
• (d) electrical lead means connected to said piezo member and said disc, wherein upon vibration of said body means in said selected range, said disc resonates and said piezoelectric member is flexurally strained and generates an electrical signal along said lead means.