Patent ID: 8274006

Claim:
A key structure, comprising: a base; a thin-film circuit disposed on the base; a key cap disposed on the thin-film circuit; and a gas releasable elastic structure disposed between the key cap and the thin-film circuit, and comprising: a cap body having a first opening and a second opening opposite to and smaller than the first opening, wherein the second opening corresponds to the key cap; a ring-shaped flange connecting an edge around the first opening of the cap body; a motion pillar disposed in the cap body and having a through hole, an upper surface and a lower surface opposite to the upper surface, wherein the upper surface connects the inner wall of the second opening, the lower surface is opposite to the first opening, and the through hole is extended to the upper surface from the lower surface and connects the second opening; and a conductor disposed on the lower surface and having a breach and an indent which are interconnected, wherein the breach corresponds to and interconnects with the through hole, so that when the first opening is closed, the gas inside the cap body is dissipated to the exterior of the cap body via the indent, the breach, the through hole and a gap between the second opening and the key cap.