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 </div><div> 　　<img alt="" src="/web/20230312055221im_/http://www.czhyddz.com/uploads/allimg/8225/-Q2254230a5.jpg" style="width: 600px; height: 78px;"></div><div>  </div><div> 　　图2所示为压电振动板的振荡体系。 当在压电振动板的两个电极间施加直流电压时，由于压电效应，导致机械变形。对于形状扭曲的压电元件，其变形以辐射方向伸展。</div><div>  </div><div> 　　压电振动板则沿图2(a)所示方向弯曲，而粘结于压电振动板的金属片不会伸展。相反，当压电元件收缩时，压电振动板则会沿图2(b)所示方向弯曲。因此，当交流电压穿过电极时，如图2(c)所示，图2(a)和图2(b)所示之弯曲就会交替重复发生，从而在空气中产生声波。</div><div>  </div><div> 　　蜂鸣片一般而言，人的声频范围大约在20Hz到20kHz之间。人们易听到的声频为2kHz到4kHz。因此，绝大部分压电声音元件应用在此声频范围内。同时，蜂鸣片谐振频率(f0)一般也选定在相同的范围内。如图3所示，谐振频率取决于支承压电振动板所采用的方法。如果压电振动板的形状相同，其数值将按照(a)、(b)和(c)的顺序变小。</div><div>  </div><div> 　　<img alt="" src="/web/20230312055221im_/http://www.czhyddz.com/uploads/allimg/8225/-Q2254233a3.jpg" style="width: 600px; height: 250px;"></div><div>  </div><div> 　　通常情况下，压电振动板被安装在共鸣腔室内，以产生高声压(如图4)。利用公式()(赫尔姆霍茨公式)，可以计算出图4鸣腔室的谐振频率(fcav)。由于压电振动板和共鸣腔室具有适当的谐振频率，分别为(f0)和(fcav)，因此，可以通过控制两者的位置来增大特定频率下的声压和获得特定的带宽。</div><div>  </div><div> 　　压电蜂鸣片广泛适用于:时钟，计算器，电话机，洗衣机，各种报警器(防盗报警器等)</div> </div> <div class="clearfix"></div> <ul class="newsnext"><li>上一篇：<a href="/web/20230312055221/http://www.czhyddz.com/cpzx/fmp/0608/1052.html">蜂鸣片</a> </li><li>下一篇：<a href="/web/20230312055221/http://www.czhyddz.com/cpzx/fmp/0608/1054.html">蜂鸣片</a> </li> <div class="clearfix"></div> </ul><div class="clearfix"></div> </div> <div class="ny_xg_title"> <p>您可能对此也感兴趣</p> </div> <div id="demoo" style=" width: 860px; overflow: hidden; margin-top: 10px;"> <table cellpadding="0" cellspace="0" border="0"><tr><td id="demoo1"><table border="0" cellspacing="0" cellpadding="0"><tr><td><li style="height: auto;margin:0px 10px; list-style-type:none"><a href="/web/20230312055221/http://www.czhyddz.com/cpzx/dzjcj/0608/1065.html"> <img src="/web/20230312055221im_/http://www.czhyddz.com/uploads/allimg/180608/1-1P60Q519280-L.jpg" width="215" height="185" style=" border: 1px solid #dedede;"><p style=" text-align:center; line-height: 30px; color: #333;">电子接插件</p> 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