Electronic pen
AssigneeWacom Co., Ltd.
InventorYoshiharu Matsumoto
Life of this patent
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Abstract
Provided is an electronic pen which communicates with a position detection sensor through electromagnetic induction, including 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, in which the magnetic core includes a front portion, a back portion, and a middle portion interposed between the front portion and the back portion, an outside diameter of the middle portion 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 the coil is wound around the middle portion of the magnetic core.
Claims11
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.
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.
Dependencies are inferred from the claim text.