Ferroelectric composite film acoustic transducer

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electrostrictive – magnetostrictive – or piezoelectric

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381191, 381173, 310324, H04R 2500

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active

052838358

ABSTRACT:
An acoustic transducer is formed by a rigid substrate and a strip of a laminated sheet material including an intermediate layer of a ferroelectrical material sandwiched between inner and outer layers of a conductive material. Two lines of conductive epoxy supply an AC signal across the full height of the inner and outer layers. The ferroelectric layer is preferably a piezoelectric plastic such as PVDF with a preferred direction of displacement oriented laterally across the strip. The strip is preferably secured in a groove in the substrate by a cement having acoustical properties closely matching those of the strip and the substrate. The strip is curved in a parabola by its own tension. The strip is sufficiently stiff to be self supporting without the use of a foam or rubber backing layer. The conductive layers are preferably each a layer of copper overlayed with a layer of nickel. The substrate preferably includes a sound chamber mounted on its back side opposite the strip and has a set of holes to transfer sound energy to the chamber. The material forming the substrates has a speed of sound closely matching that of the strip, but preferably slightly less. The substrate material is also lossy to dampen the acoustical energy.

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Edelman S. et al., Forum Comments on "Electroacoustic Transducers with Piezoelectric High Polymer Films" pp. 577-578.
Tamura, M. et al., "Electroacoustic Transducers With Piezoelectric High Polymer Films", Sep. 1974, pp. 21-25, in Journal of the Audio Engineering Society, Jan./Feb. 1975, vol. 23, No. 1.
Garner, G. M. et al., "A New Microphone for Telephone Handsets", Nov. 1977, pp. 22-27 in Systems Technology, Nov. 1977, No. 27.
Marcus, M. "Ferroelectric Polymers and Their Applications", Aug., 1981, Fifth International Meeting on Ferroelectricity at Pennsylvania State University.
Locanthi, B. et al., "Development of a Loudspeaker System with Omni-Directional Horn Loaded with Polymer Tweeter", pp. 1-5 and FIGS. 1-16.

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