US Patent 10091338 Electronic device having automatically ejectable input pen

An electronic device is provided. The electronic device includes a input pen including at least one magnet, a housing including a pen guide path for inserting the input pen, at least one electromagnet installed around the pen guide path, wherein the at least one electromagnet is installed to react to the magnetism of the magnet while the input pen is completely inserted into the pen guide path, and at least one processor supplying power having the same polarity as the magnet to the electromagnet according to an automatic ejection event of the input pen to push the magnet out of the electronic device.