Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1998-05-29
2000-06-20
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310331, 310328, 310329, H01L 4108
Patent
active
060781262
ABSTRACT:
A resonant piezoelectric alerting device (400) includes a motional mass (130) and a piezoelectric actuator (100) which is constrained to an actuator mount (132) at a first end and coupled to the motional mass (130) at a second end, the piezoelectric actuator and the motional mass in combination producing a resonant system having a predetermined frequency of operation. The piezoelectric actuator 9100) is responsive to a control signal (108, 110) generated at the predetermined frequency generates an alternating out-of-plane movement(812, 814) of said motional mass (130) which is transformed into tacile energy to provide a tactile alert about the resonant frequency (608). The out-of-plane movement (812, 814) of the motional mass (130) is also transformed into acoustic energy to provide an audible alert in response to a control signal generated above the predetermined frequency (608).
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Morton Bruce McKay
Rollins Thomas James
Dougherty Thomas M.
Macnak Philip P.
Motorola Inc.
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