| 摘要 |
PURPOSE:To eliminate the warp of a sound generator to the temperature change and to obtain the flat sound level-temperature characteristics, by adhering a piezoelectric plate made of PZT piezoelectric ceramics to a diaphragm made of a nickel alloy having a heat expansion coefficient approximately equal to that of the piezoelectric plate. CONSTITUTION:A piezoelectric disk 11 is made of 2-component or 3-component PZT piezoelectric ceramics which contains mainly PbTiO3-PbZrO3. Electrodes 12 and 13 are formed on both sides of the disk 11. While a diaphragm disk 14 is made of a high nickel alloy containing mainly Fe and Ni having a high component ratio thereof, and has a heat expansion coefficient approximately equal to that of the disk 11. This disk 14 is adhered to the disk 11 by means of two- pack thermosetting epoxy adhesive 15. |
