Piezoelectric acoustic alarm
    1.
    发明授权
    Piezoelectric acoustic alarm 失效
    压电声警报

    公开(公告)号:US06541894B1

    公开(公告)日:2003-04-01

    申请号:US10031734

    申请日:2002-06-03

    IPC分类号: H04R1700

    CPC分类号: H04R17/00

    摘要: In a piezoelectric acoustic alarm piezoelements (2a, 2b) each excited by a square-wave voltage are arranged opposite each other in a resonance cavity (1) and each oscillate in opposing directions. The two square-wave voltages (Va, Vb) controlled by a microprocessor (8) are phase displaced by a square-wave pulse length and are positive or negative. A piezo-sound source designed and excited in this way is characterised by a high sound volume with low current consumption and small size.

    摘要翻译: 在压电声警报中,由方波电压激励的压电元件(2a,2b)在谐振腔(1)中彼此相对布置,并且每个在相反的方向上振荡。 由微处理器(8)控制的两个方波电压(Va,Vb)通过方波脉冲长度相移,为正或负。 以这种方式设计和激发的压电声源的特征在于具有低电流消耗和小尺寸的高音量。