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    • 8. 发明授权
    • Dual section electret microphone
    • 双段驻极体麦克风
    • US4329547A
    • 1982-05-11
    • US126380
    • 1980-03-03
    • Tsutomu Imai
    • Tsutomu Imai
    • H04R1/40H04R19/01H04R19/04
    • H04R19/04H04R19/016
    • A bi-directional capacitor microphone is formed of first and second transducer sections, each section comprising a diaphragm and a back plate facing the diaphragm and separated therefrom. The diaphragm of the first transducer section includes an electret and the back plate of the second transducer section includes another electret. The back plates of the first and second transducer sections are disposed in a back-to-back configuration and are electrically coupled to each other and to one output. The diaphragms of the first and second transducer sections are connected to each other and to another output, so that an output signal appears between the outputs. Preferably, both electrets are selected to have a negative polarity. The bi-directional microphone so constructed exhibits superior response for lower audio frequencies.
    • 双向电容麦克风由第一和第二换能器部分形成,每个部分包括一个隔膜和一个面向隔膜的后板,并与之隔开。 第一换能器部分的振膜包括驻极体,第二换能器部分的背板包括另一驻极体。 第一和第二换能器部分的背板以背靠背的形式设置,并且彼此电连接并连接到一个输出端。 第一和第二换能器部分的隔膜彼此连接并连接到另一输出端,​​从而在输出之间出现输出信号。 优选地,两个驻极体被选择为具有负极性。 如此构造的双向麦克风对于较低的音频表现出优异的响应。