Patent ID: 8049125

Claim:
A key structure, comprising: at least two protruding keys arrayed adjacently, each the at least two protruding keys has: a first side edge; a second side edge opposite to the first side edge; and a protrusion, having: a curved-convex surface getting protruding inwardly from the first side edge and the second side edge, wherein the top end of the curved-convex surface has a crest line, the curved-convex surface has a non-continual surface at the crest line; a first side surface passing through the end points of the first side edge, the second side edge and the crest line in the same side; and a second side surface passing through the end points of the first side edge, the second side edge and the crest line in the other side, wherein the second side surface is opposite to the first side surface; and a key frame used for carrying the at least two protruding keys.