| 摘要 |
PURPOSE:To uniformize the tension of a diaphragm by fitting a support member and a damping member to a prescribed position of a substrate in advance, adhering the diaphragm from the upper part and curving the substrate cylindrically. CONSTITUTION:The substrate 1 is made of, e.g., aluminum-made porrous plate and the support member 2 is fitted to both ridges of the upper face and the plate agent of foamed urethane resin is adhered to the upper face of the substrate 1 between the support members 2 as the damper member 3. Then the diaphragm 4 made of a piezoelectric polymer film consisting of polyfluoride vinylidene forming the electrodes 4a on both sides is fixed to the stripes of the support member 2 by heating and the substrate 1 is formed on the cylindrical face having a prescribed curvature by a jig 5. Thus, the tension of the diaphragm is uniformized to improve and stabilize frequency characteristics.
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