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

Claim 0:
1. An electronic pen which communicates with a position detection sensor through electromagnetic induction, the electronic pen comprising:
a coil;
a columnar magnetic core including a through hole in an axial direction of the magnetic core;
a capacitor constituting a resonant circuit together with the coil; and
a rod-shaped core body inserted through the through hole of the magnetic core,
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 of the magnetic core,
a back portion in a predetermined range from the back end of the magnetic core toward the front end of the magnetic core, 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.