Composite type acoustic transducer

Details Composite type acoustic transducer Composite type acoustic transducer

1978-12-18

1980-12-30

Moffitt, James W.

179111R, 1791155PV, H04R 2302

Patent

active

042425417

ABSTRACT:
A composite type acoustic transducer of a flat drive type electrodynamic transducer and a piezoelectric type transducer. A diaphragm has a membrane of any suitable shape made of high molecular piezoelectric material such as polyvinylidene fluoride, an electrode layer applied on one surface of a membrane, and a coil like conductor applied on the other surface of the membrane. A supporting member supports the diaphragm along its edge. A permanent magnet device produces a magentic field extending in parallel to a plane of the diaphragm and perpendicular to the coil like conductor. When an audio signal current passes through the coil like member and an audio signal voltage is applied across the electrode layer and the coil like conductor, the piezoelectric membrane shrinks and stretches, and at the same time a force to drive the membrane in a direction perpendicular to the diaphragm is generated due to an electromagnetic interaction between the current flowing through the coil-like conductor and the magnetic field.

REFERENCES:
patent: 3947708 (1976-03-01), Fulenwidel
patent: 4020296 (1977-04-01), Dahlquist

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