Patent ID: 6293808
Filing Date: 2001-09-25
Classification: G01R,H01R,H05K

Abstract:
A contact sheet used With a socket for connecting an integrated circuit having spherical terminals to a board, comprising:protruding contact springs in some or all of numerous through holes provided in a sheet composed of an insulative elastic material, wherein:each of said contact springs is composed of a conductive material and constituted by two or more cantilevers fixed onto said sheet by bonding or sandwiching at one end thereof;said each cantilever has a lower supporting portion and a spherical terminal holding portion;said lower supporting portion is formed adjacently to a portion fixed to said sheet;said spherical terminal holding portion is formed by vertically bending the other end of said cantilever toward one of two openings of a through hole; andwhen said integrated circuit is mounted, said spherical terminal enters into a gap at the spherical terminal holding portion of said two or more cantilevers to cause said lower supporting portion to be flexed toward the other opening, and after said lower supporting portion comes in contact with the board, the spherical terminal holding portions of said two or more cantilevers are pushed and spread in a direction away from the portion of each cantilever that is fixed to said sheet.