Patent ID: 8188829

Claim:
A coil substrate structure comprising: a first coil substrate having a primary transformer coil part; and a second coil substrate, disposed on the first coil substrate, having a secondary transformer coil part, the coil substrate structure transmitting electric power from the first coil substrate side to the second coil substrate side; wherein the primary and secondary transformer coil parts include a spirally extending conductor pattern as seen in a substrate thickness direction; wherein the first and second coil substrates are disposed on each other while being shifted from each other such that the primary and secondary transformer coil parts overlap each other as seen in the substrate thickness direction; wherein the primary and secondary transformer coil parts have a width in a predetermined direction narrower than a width in a direction intersecting the predetermined direction as seen in the substrate thickness direction; wherein the predetermined direction is a direction extending along the electric power transmitting direction; wherein the first and second coil substrates have an elongated planar form and are disposed on each other while being longitudinally shifted from each other; and wherein the primary and secondary transformer coil parts have a width in a longitudinal direction as the predetermined direction narrower than a width in a lateral direction as the intersecting direction as seen in the substrate thickness direction.