Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1992-05-04
1993-09-14
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310321, 310312, 34082544, H01L 4108
Patent
active
052452450
ABSTRACT:
An electronic device (100) includes a housing (222) and a piezo-bender (400). The piezo-bender (400) includes a metal beam (402) having at least a portion of a surface mechanically coupled to a piezo-ceramic layer (304). The piezo-bender (400) is flexibly coupled to the housing (222) at an end of the metal beam (402) forming a cantilever structure. A vibratable body (404) is mechanically coupled to the other end of the metal beam (402). A tuning slide (604) is slidably coupled to the piezo-bender (400) for mechanically tuning the resonant frequency of vibration of the piezo-bender (400) by varying the length of the piezo-bender (400) that can vibrate. An electrical drive circuit (708) is electrically coupled to the piezo-bender (400) for electrically driving the piezo-bender (400) with a drive signal to generate vibratory motion in the piezo-bender (400) for providing a vibratory alert.
REFERENCES:
patent: 2045427 (1936-06-01), White
patent: 3229387 (1966-01-01), Linvill
patent: 3336529 (1967-08-01), Tygart
patent: 3445843 (1969-05-01), Pena
patent: 3513899 (1970-07-01), Taylor
patent: 3712962 (1973-01-01), Epley
patent: 4518961 (1985-05-01), Davis
patent: 5008580 (1991-04-01), Masuda et al.
patent: 5068567 (1991-11-01), Jones
Berry Thomas G.
Budd Mark O.
Gutman Jose
Koch William E.
Motorola Inc.
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