Piezoelectric electroacoustic transducer
AssigneeSocieta Italiana Telecomunicazioni Siemens S.p.A.
InventorsRoberto Pipitone, Colombo Gnocchi
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Abstract
An electroacoustic transducer, such as a microphone or a telephone receiver, comprises a thermoplastic body with a central plateau surrounded by an annular recess from which an elastic ring projects slightly above the plateau to support a membrane in the form of sheet-metal foil carrying a piezoceramic layer. The body is overlain by a thermoplastic cover which has apertures for the passage of sound waves and is formed with an internal annular rib registering with the elastic ring to clamp the rim of the membrane therebetween. The body, the cover and a thermoplastic base are joined together by ultrasonic welding.
Claims10
An electroacoustic transducer comprising a dielectric body centered on an axis and provided with a central plateau surrounded by an annular recess, an apertured dielectric cover overlying said body and forming a flat sound chamber therebetween, an elastic ring in said recess rising above said plateau, said cover being formed within said sound chamber with an annular rib registering with said ring, a piezoelectric membrane in said sound chamber having a rim clamped between said ring and said rib, and conductor means in said body for connecting said membrane in an electric circuit.
Dependencies are inferred from the claim text.