Composite type acoustic transducer
First Claim
1. A composite type acoustic transducer of a flat drive type acoustic transducer and of a piezoelectric type acoustic transducer comprising:
- a diaphragm including a membrane made of high molecular piezoelectric material, an electrode layer applied on one surface of the membrane and a coil-like conductor applied on the other surface of the membrane;
means for supporting the diaphragm along its edge;
means for forming a magnetic field extending in parallel with the diaphragm and cooperating electromagnetically with the coil-like conductor;
means for supplying an audio signal current through said coil-like conductor; and
means for applying a voltage related to an audio signal to be reproduced across the electrode layer and the coil-like conductor.
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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.
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Citations
18 Claims
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1. A composite type acoustic transducer of a flat drive type acoustic transducer and of a piezoelectric type acoustic transducer comprising:
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a diaphragm including a membrane made of high molecular piezoelectric material, an electrode layer applied on one surface of the membrane and a coil-like conductor applied on the other surface of the membrane; means for supporting the diaphragm along its edge; means for forming a magnetic field extending in parallel with the diaphragm and cooperating electromagnetically with the coil-like conductor; means for supplying an audio signal current through said coil-like conductor; and means for applying a voltage related to an audio signal to be reproduced across the electrode layer and the coil-like conductor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification