Wire rod for spring, contact probe and probe unit

摘要

While guaranteeing spring characteristic, it offers the probe unit which uses the contact probe and the particular contact probe which use the wire rod for the spring and the wire rod for the particular spring which can guarantee corresponding possible conductivity even in the high frequency signal which possesses the frequency above 1GHz. Because of this object, the core material and Young's modulus in the line where electric electrical resistivity consists of the conductive material of 5.00 10-8 m or less consist of the spring material of 1.00 104 kgf/mm2, or more the cladding material 3 which covers the outer circle of the core material and, have. Cladding thickness d of the cladding material is smaller than minimum r of distance to the periphery of the said cross section from center of gravity of the cross section of the core material.