| 摘要 |
PURPOSE:To obtain high sound pressures of several kinds of frequencies and to allow the generation of specific timbers by providing an auxiliary oscillation diaphragm fixed by an elastic body, the projecting part of which comes into contact with a piezoelectric oscillation diaphragm, and providing vent holes to the auxiliary oscillation diaphragm or metallic base plate. CONSTITUTION:The auxiliary oscillation diaphragm 10, the projection 7 of which comes into contact with the piezoelectric oscillation diaphragm 3, and which is fixed by the elastic body 8 to the oscillation diaphragm 3 and has the vent holes 9 is provided. The piezoelectric sounder is capable of producing the high sound pressures of the plural frequencies by the resonance of the oscillation diaphragm 3, the resonance of the air chamber between the oscillation diaphragm 3 and a case 5 and a sound releasing hole 4 and the resonance of the auxiliary oscillation diaphragm 10 and is further capable of generating the specific sounds as the piezoelectric oscillation diaphragm 3 comes into contact with the projection 7 of the auxiliary oscillation diaphragm 10 by the oscillation thereof. |
