Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1994-05-24
1995-04-11
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
381190, H01L 4108
Patent
active
054061610
ABSTRACT:
A piezoelectric composite receiver for use in telephones comprising a front cover, a rear cover, and a transducer plate, which is provided with an piezoelectric layer so as to provide the function of an electroacoustic transducer. Each of the front cover and the rear cover has an elliptically-shaped protrusion for clamping the transducer plate therebetween. The elliptically-shaped protrusions allows the transducer plate to freely vibrate in the frequency range of interest (i.e., between 300 Hz and 3,400 Hz), while the sound in the high frequency region (above 3,400 Hz) is effectively suppressed. The front cover and the rear cover are made of a plastic material using an injection molding process, and either the front cover or the rear cover, or both, are provided with an ultrasonic welding loop, which allows the receiver to be affixed using an ultrasound welding device. An induction coil can be imbedded in the outer periphery or an upper portion of the front cover which can be coupled to a hearing aid so as to allow an hearing impaired to utilize a telephone which utilizes the piezoelectric composite receiver.
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Cheng Syh-Yuh
Lee Yu-Lin
Budd Mark O.
Industrial Technology Research Institute
Liauh W. Wayne
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