| 摘要 |
<p>The push button has a movable part (3) manually actuated by pressure of a finger and coupled to a pusher type switch (7). A metal blade (15) is arranged near the movable part and a capacity measuring unit detects the variation of the capacity of the blade caused by the presence of the finger on the part. The blade is connected to the unit through a compression spring (17) such that the blade and the unit are maintained in electric contact during the translation of the movable part.</p> |
