Patent ID: 6078126
Filing Date: 2000-06-20
Classification: G04G

Abstract:
A resonant piezoelectric alerting device, comprising:a motional mass; anda 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 said motional mass in combination producing a resonant system having a predetermined frequency of operation, whereinsaid 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 whereinsaid 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.