US 10,511,190 B2
Power transmission apparatus wirelessly transmitting power to power receiving apparatus
Yoshihiko Okamoto, Yokohama (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Nov. 16, 2016, as Appl. No. 15/353,524.
Claims priority of application No. 2015-232310 (JP), filed on Nov. 27, 2015.
Prior Publication US 2017/0155280 A1, Jun. 1, 2017
Int. Cl. H02J 50/60 (2016.01); H02J 50/10 (2016.01); H02J 7/02 (2016.01); H02J 7/00 (2006.01)
CPC H02J 50/10 (2016.02) [H02J 7/0042 (2013.01); H02J 7/025 (2013.01); H02J 50/60 (2016.02)] 10 Claims
OG exemplary drawing
 
1. A power transmission apparatus comprising:
a power transmission circuit configured to wirelessly transmit power to an electronic device;
a foreign substance detection circuit configured to detect a foreign substance affecting power transmission performed by the power transmission circuit;
a loop shaped power transmission antenna serving as an antenna for the power transmission circuit transmitting power to the electronic device; and
a foreign substance detection antenna for the foreign substance detection circuit detecting the foreign substance,
wherein the foreign substance detection antenna is arranged at a predetermined distance or more from the power transmission antenna in a vertical direction to a loop direction of the power transmission antenna, and
wherein the predetermined distance is a distance at which a magnetic field intensity in a range in which the power transmission antenna is arranged falls within 15% from an average magnetic field intensity of the range.