| 摘要 |
PURPOSE:To attain a compact size and a smooth output sound pressure characteristic in a wide zone by producing a plate having a dome like curved portion with a flat surface shape of circle or ellipsoid, applying zircon-lead titanate forming organic precarser metal solution immediately or through an electrode to a surface of the plate, and making a thermally processing to said applied film. CONSTITUTION:On a surface and a rear surface of a metal plate (Ni plate) having a dome like curved portion of an outer diameter of 40mm and a thickness of 40mum and an edge side thereof being on a flat surface and a flat surface shape of said curved portion being circle, zircon-lead titanate piezo-electric layers 32, 33 having a thickness of 15mum produced from an organic metal compound are formed. As the organic metal compound solution, a solution for forming a piezo-electric film of PbZr0.52Ti0.48O3 is used. This applied by a dipping method and the organic compound is decomposed in an air at a temperature of 400 deg.C after drying, and thereafter thermal ly processed at a temperature of 600 deg.C for 10min to form a thin film of PbZr0.52Ti0.48O3 on the metal plate. On this metal plate, an electrodes composed of Au/Cr 34, 35 are vaporized, a circumference is fixed and a piezo-electric speaker is obtained. The piezo-electric layers 32, 33 are polarized and an oscillation in a diametrically extending direction is employed. |
