Damped resonant piezoelectric alerting device

Details Damped resonant piezoelectric alerting device Damped resonant piezoelectric alerting device

1998-05-29

1999-08-31

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310328, H01L 4108

Patent

active

059457724

ABSTRACT:
A damped resonant piezoelectric alerting device (600) includes a motional mass (130), a damping element (136, 156) magnetically coupled to the 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 (100) responds to a control signal (108, 110) to generate an alternating out-of-plane movement (812, 814) of the motional mass (130) at an amplitude (412, 414). The alternating out-of-plane movement (812, 814) of the motional mass (130) is transformed into tactile energy to provide a tactile alert about a resonant frequency (608). The amplitude (412, 414) of the out-of-plane movement (812, 814) of the motional mass (130) is controlled by the damping element (136, 156). The alternating out-of-plane movement (812, 814) of the motional mass (130) is also transformed into acoustic energy to provide an audible alert above the resonant frequency (608).

REFERENCES:
patent: 4333342 (1982-06-01), Gilden et al.
patent: 4600854 (1986-07-01), Bednorz et al.
patent: 4950931 (1990-08-01), Goldenberg et al.
patent: 5036419 (1991-07-01), Okauchi et al.
patent: 5687462 (1997-11-01), Lazarus et al.

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