SPRING WIRE ROD, CONTACT PROBE, AND PROBE UNIT

摘要

A spring wire rod includes a wire core that is made of a conductive material having an electrical resistivity of equal to or lower than 5.00×10⁻⁸ Ω•m, and a coating member 3 that is made of a spring material having a longitudinal elastic modulus of equal to or higher than 1.00×10⁴ kgf/mm² and coats an outer circumference of the core. A coating thickness d of the coating member is smaller than a minimum value r of a distance between the center of gravity of a transverse cross section of the core and the outer edge of the transverse cross section.