Patent ID: 8137113

Claim:
A socket comprising: an insulating elastomeric sheet formed from a fluorine-based elastomer having a penetration hole; metal circuits formed on the front and rear surfaces of the elastomeric sheet; a through-hole defined by a metal film formed on an inner wall of the penetration hole, wherein the metal circuit on the front surface of the elastomeric sheet is electrically connected to the metal circuit on the rear surface of the elastomeric sheet via the through-hole; and a groove is formed in the elastomeric sheet and surrounds at portion of the metal circuits, wherein the insulating elastomeric sheet comprises a convex portion formed of the fluorine-based elastomer, and wherein the metal circuit formed on one of the front and rear surfaces of the elastomeric sheet is formed to cover the convex portion of the elastomeric sheet, to engage the pad of a printed circuit board, and wherein a protective layer made of a material having a thermal expansion coefficient smaller than that of the elastomer sheet is laminated on at least one of the front and rear surfaces of the elastomeric sheet.