Patent ID: 7030330
Filing Date: 2006-04-18
Classification: G06F,H01H

Abstract:
1. A keyboard spill-proofing mechanism comprising: a top case engaging a plurality of key caps and allowing them to slide freely; a membrane sheet positioned below said top case, said membrane sheet including a plurality of layers having electrical circuits, which detect the off/on state of said key caps; a back plate positioned below said membrane sheet; a waterproof base sheet positioned between said top case and said membrane sheet, wherein said waterproof base sheet includes a plurality of rubber springs positioned thereon which transmit the off/on state of said key caps to said electrical circuits in said membrane sheet and multiple blocking portions which project upward from said waterproof base sheet so as to prevent spilled liquid from flowing onto said membrane sheet; and a plurality of drain holes opening in the top case and draining through a tube, wherein said tube drains through said waterproof base sheet, membrane sheet, and back plate.