Patent ID: 8567281

Claim:
A rotating device comprising: a power supply unit including a transmitting portion having a first ring-shaped coil, a first ring-shaped magnetic body covering the first ring-shaped coil and a first terminal connected to the first ring-shaped coil, and a receiving portion having a second ring-shaped coil, a second ring-shaped magnetic body covering the second ring-shaped coil and a second terminal connected to the second ring-shaped coil; a first power supply cable connected to the transmitting portion and a second power supply cable connected to the receiving portion; and a bearing connecting a hollow fixed portion to a hollow rotating portion with a hole in a center of the hollow rotating portion, wherein: the hollow rotating portion is capable of rotating with respect to the hollow fixed portion, the first ring-shaped coil and the second ring-shaped coil are formed so as to be wound around a rotation axis of the bearing, the first ring-shaped magnetic body and the second ring-shaped magnetic body face each other with a gap formed in the direction of the rotation axis, the power supply unit is provided inside the hollow fixed portion and inside the hole of the hollow rotating portion, the first power supply cable and the second power supply cable pass inside the hollow fixed portion and inside the hole of the hollow rotating portion, and the power supply unit is closer to the rotation axis than the bearing.