Patent ID: 8866506
Filing Date: 2014-10-21
Classification: G01R

Abstract:
1. A contact structure for inspection that is installed on a bottom surface of a circuit board and inspects an electrical characteristic of an inspection target object, the contact structure comprising: a ground conductor that is grounded; an elastic contact member that is brought into contact with the inspection target object; and a conductive line that electrically connects the circuit board and the elastic contact member, wherein the elastic contact member is provided on a bottom surface of the ground conductor, and the elastic contact member includes: a contactor that is brought into contact with the inspection target object, a wiring layer that electrically connects the contactor and the conductive line, an insulating layer that is provided between the wiring layer and the ground conductor, and an elastic body that is provided at a position facing the inspection target object via the contactor, wherein the wiring layer is provided in parallel with the ground conductor, the ground conductor and the wiring layer form a microstrip line with the insulating layer sandwiched therebetween, and a width of the wiring layer and a distance between the wiring layer and the ground conductor is set such that impedance matching of the entire contact structure including the elastic contact member is performed, wherein the ground conductor is provided with a cylindrical through hole formed in a vertical direction, the conductive line is accommodated within the cylindrical through hole coaxially with the cylindrical through hole, a cylindrical insulating layer is formed on an inner surface of the cylindrical through hole, the elastic body is configured to provide the contactor with elasticity via the microstrip line, and a thickness of the cylindrical insulating layer is smaller than a distance between an outer circumferential surface of the conductive line and an inner circumferential surface of the ground conductor within the cylindrical through hole.