Patent ID: 7548013

Claim:
A piezoelectric buzzer effective for use in a personal assist safety system (PASS), comprising: a) a vibration layer; b) a piezoelectric material at least partially overlaying said vibration layer in a manner effective for causing said vibration layer to vibrate to emit a buzzing sound when an electric current is applied to the piezoelectric material; and c) electric contacts effective for connecting the piezoelectric layer to an electric power source; wherein said piezoelectric material is a material having a base formula of: Pb x Sr (1-x) (Mn 1/3 Sb 2/3 ) (1-y) (Zr Z Ti 1-z ) y O 3 wherein x may range from 0.95 to 0.99; wherein y may range from 0.92 to 0.97; and wherein z may range from 0.45 to 0.55 wherein said piezoelectric material includes one or more dopants added by incorporating into the pre-fired composition one or more dopant precursor materials selected from the group consisting of: CeO 2 , CuO, and Nb 2 O 5 .