Patent ID: 7343825

Claim:
A torque sensor for detecting a torque of a rotating shaft having magnetostrictive properties, comprising: coil units which each comprise a plurality of coils and are disposed along a virtual concentric circle drawn on said rotating shaft, said coil units including lines extended in a direction which crosses a direction substantially parallel to the direction of rotation of said rotating shaft, said coil units constituting a folded structure comprising first wiring comprising a line, which constitutes a snaking first path and is extended in a direction which crosses a direction substantially parallel to the direction of rotation of the rotating shaft, and second wiring which constitutes a snaking second path, insulation being made at crossed parts where the first wiring crosses the second wiring, a closed coil is formed in a region surrounded by the first wiring and the second wiring; and a detection section to detect a change in properties of the coil units.