Patent ID: 11960664
Assignee: WACOM CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 10:
11. An electronic pen of a capacitance system, the electronic pen comprising:
a coil connected to a charging circuit of a battery which, in operation, supplies drive power;
a columnar magnetic core including a through hole in an axial direction of the magnetic core;
a rod-shaped core body inserted through the through hole of the magnetic core; and
a resonant circuit which, in operation, generates a signal that is transmitted through the core body,
wherein the magnetic core includes:
a front portion in a predetermined range from a front end of the magnetic core on a pen tip side of the magnetic core toward a back end of the magnetic core on a side of the magnetic core opposite to the pen tip side,
a back portion in a predetermined range from the back end of the magnetic core toward the front end, and
a middle portion interposed between the front portion and the back portion,

wherein an outside diameter of the middle portion of the magnetic core is smaller than an outside diameter of the front portion of the magnetic core and an outside diameter of the back portion of the magnetic core, and
wherein the coil is wound around the middle portion of the magnetic core.