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Resonant piezoelectric alerting device

  • US 6,078,126 A
  • Filed: 05/29/1998
  • Issued: 06/20/2000
  • Est. Priority Date: 05/29/1998
  • Status: Expired due to Term
First Claim
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1. A resonant piezoelectric alerting device, comprising:

  • a motional mass; and

    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 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.

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