发明授权
US4378478A Double-domed elastomeric keyboard element 失效
双穹顶弹性键盘元素

Double-domed elastomeric keyboard element
摘要:
A double-domed elastomeric keyboard element is disclosed in which a solid contact disc is connected to the junction of the domes of the keyboard element housing. The inner dome is provided on its inside with a downwardly extending projection which engages the contact disc when the keyboard element is depressed to press the disc against a pair of conductors on a printed circuit board below the element. Because of the non-positive connection between the key plunger and the conductors, the contact pressure is almost equal to the operating force.
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