电话机中的新型送话器——驻极体送话器

• 作 者: 罗天玲
• 出 处: 家用电器
• 发表日期: 1994年11期
• 关键词: 永电体 声电器件 内藏 电荷量 人工方法 场效应管 话音信号 座板 反馈电阻 线路电流

驻极体也称为“永电体”,它是一种永久带电的薄膜。日本在1919年首次用人工方法制成第一块驻极体,四十多年以后,经测试,它带的电荷量只减少了20％。无论用什么方法将驻极体进行分割,它的表面仍能分别出现正、负电荷,利用由此产生的电场,可制成各种声电器件,如收录机中的内藏话筒,电话机中的送话器等。

Electret, also known as “permanent body”, it is a permanently charged film. For the first time in 1919, Japan made the first electret by hand and after more than 40 years it had been tested that it had only reduced its charge by 20%. Regardless of the method used to segment the electret, its surface can still appear positive and negative charges, respectively, using the resulting electric field, can be made of a variety of acoustic and electric devices, such as the tape recorder built-in microphone, the phone Microphone and so on.