Electronic pen and electronic pen main body

An electronic pen comprising:

• a tubular chassis in which an opening is made on one end in an axial center direction serving as a pen tip side and another end is closed;
• and
• an electronic pen main body housed in the tubular chassis, wherein the electronic pen main body includes:
• a magnetic core that has a through-hole and around which a coil is wound in a direction along the through-hole,
• a core body that is inserted in the through-hole of the magnetic core and has electrical conductivity,
• a capacitor that forms a resonant circuit with the coil,
• a signal generation circuit which, in operation, generates a signal that enables a position of the electronic pen main body to be detected, the signal being transmitted through the core body,
• a switch electrically coupled between the signal generation circuit and the core body;
• an electricity storage device, and
• a charge circuit which, in operation, charges the electricity storage device by an induced current generated in the coil according to an external magnetic field,
• wherein, while the resonant circuit operates, the signal generated by the signal generation circuit is concurrently transmitted through the core body,
• wherein, in a state in which the electronic pen is used with a first sensor of an electromagnetic induction system, the switch is in a state in which the signal does not flow from the signal generation circuit to the core body, and the electronic pen, in operation, receives electromagnetic energy from the first sensor and returns the received electromagnetic energy to the first sensor by the resonant circuit, charges the electricity storage device by the induced current generated in the coil, and transmits a signal that indicates a position of the electronic pen from the resonance circuit to the first sensor of the electromagnetic induction system, and
• wherein, in a state in which the electronic pen is used with a second sensor of a capacitive coupling system, the switch is in a state in which the signal flows from the signal generation circuit to the core body, and the electronic pen, in operation, transmits the signal generated by the signal generation circuit to the second sensor through the core body.

An electronic pen main body having at least a pen tip housed in a tubular chassis of an electronic pen, the pen tip being protrudable from an opening on one side of the tubular chassis in an axial center direction, the electronic pen main body comprising:

• a magnetic core that has a through-hole and around which a coil is wound in a direction along the through-hole;
• a core body that is inserted in the through-hole of the magnetic core and has electrical conductivity;
• a capacitor that forms a resonant circuit with the coil;
• a signal generation circuit which, in operation, generates a signal that enables a position of the electronic pen main body to be detected, the signal being transmitted through the core body;
• a switch electrically coupled between the signal generation circuit and the core body;
• an electricity storage device;
• and
• a charge circuit which, in operation, charges the electricity storage device by an induced current generated in the coil according to an external magnetic field,
• wherein, while the resonant circuit operates, the signal generated by the signal generation circuit is concurrently transmitted through the core body,
• wherein, in a state in which the electronic pen is used with a first sensor of an electromagnetic induction system, the switch is in a state in which the signal does not flow from the signal generation circuit to the core body, and the electronic pen, in operation, receives electromagnetic energy from the first sensor and returns the received electromagnetic energy to the first sensor by the resonant circuit, charges the electricity storage device by the induced current generated in the coil, and transmits a signal that indicates a position of the electronic pen from the resonance circuit to the first sensor of the electromagnetic induction system, and
• wherein, in a state in which the electronic pen is used with a second sensor of a capacitive coupling system, the switch is in a state in which the signal flows from the signal generation circuit to the core body, and the electronic pen main body, in operation, transmits the signal generated by the signal generation circuit to the second sensor through the core body.