Patent ID: 8405486

Claim:
An electric power transmitting and receiving device for transmitting electric power from a transmitting device to a receiving device using magnetic resonance at a predetermined resonance frequency, wherein the transmitting device includes: a transmission unit which includes a transmission loop and a transmission coil and transmits the electric power; a supplying unit which supplies the electric power to the transmission unit; a detection unit which detects a frequency transmitted from the transmission unit; and a transmitter which includes a first correction unit for correcting the frequency transmitted from the transmission unit, and the receiving device includes: a reception unit which includes a reception loop and a reception coil for receiving the electric power transmitted from the transmission unit; a first antenna having a resonance frequency higher than that of the reception unit; a second antenna having a resonance frequency lower than that of the reception unit; a comparing unit which compares reception levels between the first antenna and the second antenna; and a receiver which includes a second correction unit for correcting the resonance frequency of the reception unit on the basis of the comparison result of the comparing unit.