| 摘要 |
A dual function button for keyboards and keypads. The button includes a first contact switch which is activated by a first manual pressure. The first contact switch is preferably formed by a resilient cover having a conductive pellet on its interior face, and a flexible substrate having spaced contacts below the pellet. The first manual pressure causes the pellet to impinge upon the spaced contacts, completing a first circuit. The button also includes a second contact switch which is activated by a second, greater, manual pressure. The second contact switch includes the resilient cover of the first switch, a rigid substrate mounting spaced contacts, and a flexible conductive dome mounted on the rigid substrate below the resilient cover. The second manual pressure will cause the dome to resiliently deform and impinge upon the contacts, closing a second circuit. In this manner two functions may be provided by a single switch. The two functions may advantageously be a dual-speed cursor control.
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