| 摘要 |
A tact switch includes an insulative housing, a first conductive electrode, a second conductive electrode, an actuator and a metal cover. The insulative housing defines a receiving cavity which is provided with a fixed terminal and a movable terminal movably contacting with the fixed terminal. The first and second conductive electrodes are received in the receiving cavity. The second conductive electrode is located above and separated from the first conductive electrode. The actuator includes a ring portion defining a through hole at a center thereof, a press seat received in the through hole and defining a receiving groove and an elastic element received in the receiving groove. The metal cover is secured to the insulative housing and fixes the actuator in the insulative housing. When the ring portion is pushed by an exterior force, the elastic element drives the movable terminal to contact with the fixed terminal and a distance change between the first and second conductivity electrodes. And after the movable terminal can not further be moved, the distance between the first and second electrodes further change smaller due to own elasticity of the elastic element made from elastic material.
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