Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1987-03-19
1988-08-02
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310324, 310339, 310317, H01L 4108
Patent
active
047615826
ABSTRACT:
An electroacoustic transducer such as a piezoelectric element transducer includes an output mode for generating an alert signal and an input mode for generating a switching signal. The transducer comprises an actuating means, such as a pushbutton, a resilient member, such as a snap action dome, a housing and a piezoelectric element. In the output mode, voltage is supplied to the piezoelectric element to generate mechanical vibrations which are converted to acoustical energy by a resonant cavity and port in the housing. In the input mode, manual pressure on the pushbutton forces the dome, being interposed between the pushbutton and piezoelectric element to collapse and deform the piezoelectric element. In response, the piezoelectric element generates an electrical signal. A voltage sensing circuit senses the electrical signal and generates an input signal. The circuit distinguishes between the voltage supplied to the piezoelectric element to generate mechanical vibrations and the electrical signal generated by the collapsed dome.
REFERENCES:
patent: 3464531 (1969-09-01), Herr et al.
patent: 3976899 (1976-08-01), Fanshawe
patent: 4185621 (1980-01-01), Morrow
patent: 4240002 (1980-12-01), Tosi et al.
patent: 4373119 (1983-02-01), Feder
patent: 4374377 (1983-02-01), Saito et al.
patent: 4580074 (1986-04-01), Gilman
Brown, Jr. Winfield J.
Budd Mark O.
Downey Joseph T.
Motorola Inc.
Sarli, Jr. Anthony J.
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