Contactless power supply mechanism and secondary coil for contactless power supply mechanism

摘要

Provided is a contactless power supply mechanism having high power supply efficiency. A power receiving unit (B) for supplying power to an electric device includes a secondary coil (3) and a power supplying unit (A) for supplying power to the power receiving unit (B) includes a primary coil (1). The primary coil (1) includes a primary core (11) formed of magnetic material and a length of winding wire (12) formed of conductive material and wound around the primary core (11). The secondary coil (3) includes a bar-shaped secondary core (31) formed of magnetic material, a length of winding wire (32) formed of conductive material and wound around the secondary core (31) and a magnetic sheet (4) attached to at least one of end faces (31a) of the secondary core (31). The magnetic sheet (4) includes a close-contact portion (41) placed in close-contact with the end face (31a) of the secondary core (31) and a curved portion (42) which extends outwards from the close-contact portion (41) beyond an outer edge of the end face (31a) and whose normal line has a portion un-parallel with an axial direction of the secondary core (31).