Wireless power supply apparatus for linear motion type robot

A wireless power supply apparatus for a linear motion type robot that supplies power without contact between a pair of a power transmission coil and a power reception coil using magnetic resonance, the wireless power supply apparatus comprising:

• a high-frequency signal generating means for generating a high-frequency signal for foreign matter detection having different wavelength and frequency from a high-frequency signal for transmitting power between the power transmission coil and the power reception coil, in which the wavelength is wavelength λ and the frequency is frequency f;
• an apparent antenna that is configured by the power transmission coil and of which the long side is set to λ/2 in relation to the wavelength λ;
• a resonance wave detecting means for detecting at least either of a wavelength λx or a resonance frequency fx of a resonance wave attributed to resonance in the antenna when the high-frequency signal for foreign matter detection generated by the high-frequency signal generating means is supplied to the antenna;
• and
• a foreign matter detecting means for detecting whether or not foreign matter is present on the power transmission coil based on the wavelength λx or the resonance frequency fx detected by the resonance wave detecting means.