Resonant piezoelectric alerting device

A resonant piezoelectric alerting device, comprising:

• a motional mass;
• a piezoelectric actuator, constrained to an actuator mount at a first end and coupled to said motional mass at a second end, said piezoelectric actuator and motional mass in combination producing a resonant system having a predetermined frequency of operation;
• and
• a housing for enclosing said motional mass and said piezoelectric actuator, wherein
• said piezoelectric actuator being responsive to a control signal generated at the predetermined frequency, for producing an out-of-plane movement of said motional mass and for maximizing the amplitude of the out-of-plane movement of said motional mass,
• whereby the out-of-plane movement of said motional mass is transformed into tactile energy to provide a tactile alert, and further wherein
• said piezoelectric actuator being responsive to a control signal generated at frequencies above the predetermined frequency, for producing an out-of-plane movement of said piezoelectric actuator,
• whereby the out-of-plane movement of said piezoelectric actuator is transformed into acoustic energy to provide an audible alert.