Patent ID: 6636164
Filing Date: 2003-10-21
Classification: H01H

Abstract:
A key structure used in the user interface of an electrical device, the key structure comprising:A plate member which comprises electrical couplings for transforming keystrokes into electrical signals; An electrically conducting dome member on said plate member resting against said plate member, which dome member is arranged to have such suitable elastic characteristics that it is at least partly pressed against the plate member when a pressing force substantially perpendicular towards the plate member acts on the dome member, and to return to the dome position when the pressing force is removed; and A button member made of an electrically isolating material and being on top of said dome member, wherein a lower edge of said button member is contiguously engaged with the surface of said dome member and said dome member is covered in total by said button member, and said button member is arranged to undergo an elastic deformation due to said pressing force in the same manner as said dome member.