US Patent 10886760 Wireless charging device

Disclosed is a wireless charging device including a first cover, at least a portion of a surface of which has a frictional force of a specific magnitude, a second cover disposed under the first cover and having an elastic force of a specific magnitude, an upper housing disposed under the second cover, a lower housing coupled to the upper housing, at least one charging coil disposed between the upper housing and the lower housing and configured to supply electric power to an electronic device positioned on an upper surface of the first cover, a power source part connected to the at least one charging coil, and a holding state changing part configured to help change holding states of the upper housing and the lower housing.