推荐回答（4个）
轻触开关根据原理的不同可分为两种，一种是利用金属弹片来完成开关导通截止状态的切换，该类轻触开关手感好，按下按钮至一定程度时伴随有滴答的声音出现;另一种是利用导电橡胶来完成开关导通截止状态的切换，该类开关手感也好，但接触电阻大，约为上一种的10000倍。
轻触开关的结构主要可分为盖板、按钮、弹片、基座、引脚五大部分，其中，按钮指的是外力施加处;弹片是轻触开关的关键组件，开关的通断就是靠弹片受力变化引起的;引脚指的是轻触开关与电路的联接处，一般为五个引脚，两两一组，还有一个引脚用于接地作用，当开关被正确受力时，四个引脚相导通使得电路导通，而开关没有正确外力对其施压时，四个引脚两两一组并不相通，使得电路处于断开状态。
当我们按下轻触开关的按钮时，其弹片受到弹力作用发生形变向下接触到焊片，使得开关的两组引脚相导通，从而使得电路呈现导通状态;而当我们撤离外力时，弹片形变恢复原始状态，脱离焊片，开关的两组引脚也不再导通，从而使得电路呈现截止状态。
小小的电子元器件能够控制整个电器设备的运转，有什么神奇之处呢？来了解轻触开关的构造，由上至下，它是由盖板、按钮、弹片、基座、引脚组成，其中按钮是外力通过盖板施加外力的地方，弹片是轻触开关的核心组件，引脚指的是轻触开关与电路的连接处，一般为五个引脚，两个引脚为一组，第五个引脚起接地作用，向开关施加外力时四个引脚相导通，使得开关接通，没有外力施压时四个引脚两两一组不相通，开关处于断开状态。
轻触开关的通断是靠金属弹片受力变化来实现的，使用时按下开关按钮，其弹片受到外力作用发生形变向下接触到焊片，使得开关的两组引脚相导通，从而使得电路呈现导通状态，撤离外力时，弹片形变恢复原始状态，脱离焊片，开关的两组引脚不再导通，电路呈现断开状态。
鉴于轻触开关在我们日常家电中应用之广泛，了解清楚轻触开关的构造和原理是很有必要的，如此才能在购买时选到真正适合自己的产品。
轻触开关是一种电子开关，也称为触摸开关。其原理是利用人体静电感应，当人体接触开关时，会产生微弱的电流，这个微弱的电流会被开关感应并产生反馈信号，从而控制电路的开关状态。
轻触开关通常由外壳、接线端子、触点、弹簧、触控板等组成。当人体接触触控板时，触点与触控板之间会形成微小的电容，这个电容的值足以激活开关并产生反馈信号。触控板上通常涂有一层导电材料，如导电银浆或导电碳漆，以增加电容的感应效果。
因为轻触开关不需要实际的物理按压，所以它被广泛应用在各种电子设备中，如计算机、手机、音响等等。它的优点是易于使用，耐用，还可以提高电子设备的外观设计。
就是通断原理。
轻触开关由:嵌件、基座、弹片、按钮、盖板组成其中防水类轻触开关在弹片上加一层聚酰亚胺薄膜(如图)。
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