US Patent 10459539 Electronic pen and electronic pen main body

An electronic pen has a tubular housing which has an opening provided at one end in an axial direction of the housing and is closed at another end thereof, and has at least one electronic pen main body accommodated in the tubular housing. The electronic pen main body includes a core body having an end in the axial direction of the housing that serves as a pen tip, and a magnetic core provided at an end of core body that is opposite to the end of the core body that serves as the pen tip and having a coil wound thereon. In operation, the end of the core body that serves as the pen tip projects from the opening of the housing to outside of the housing, and part of the magnetic core projects from the opening of the housing to outside of the housing.