Electret
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An electret is a charged body made of a material whose dielectric polarization remains even when the electric field is removed, like the magnetic polarization of a permanent magnet. It is named after the magnet. It is made of plastics such as Mylar and polypropylene. An electret condenser microphone is a product that uses the electric field formed by an electret. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
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永久磁石の磁気分極のように，ある種の誘電体において誘電分極が電界をなくしても残留する物質でつくられた荷電体。磁石 magnetにならって electretと名づけられた。マイラーやポリプロピレンなどのプラスチックでつくられる。エレクトレットにより形成される電界を利用した製品にエレクトレットコンデンサマイクロホンがある。
出典 ブリタニカ国際大百科事典 小項目事典ブリタニカ国際大百科事典 小項目事典について 情報 |
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