US 12,008,177 B2
Electronic pen, handwriting input device, and central rod for electronic pen
Yoshiharu Matsumoto, Saitama (JP)
Assigned to Wacom Co., Ltd., Saitama (JP)
Filed by Wacom Co., Ltd., Saitama (JP)
Filed on May 1, 2023, as Appl. No. 18/310,418.
Application 18/310,418 is a continuation of application No. PCT/JP2021/037074, filed on Oct. 7, 2021.
Claims priority of application No. 2020-204732 (JP), filed on Dec. 10, 2020.
Prior Publication US 2023/0273688 A1, Aug. 31, 2023
Int. Cl. G06F 3/0354 (2013.01); G06F 3/03 (2006.01); G06F 3/038 (2013.01); G06F 3/041 (2006.01); G06F 3/046 (2006.01)
CPC G06F 3/03545 (2013.01) [G06F 3/0383 (2013.01); G06F 3/04162 (2019.05); G06F 3/046 (2013.01); G06F 3/03 (2013.01); G06F 3/0354 (2013.01); G06F 3/041 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An electronic pen, configured to transmit and receive a signal to and from a position detection sensor by electromagnetic induction, the electronic pen comprising:
a coil;
a magnetic core around which the coil is wound, the magnetic core having a through-hole in an axial center direction;
a capacitor that forms a resonant circuit with the coil; and
a central rod that is inserted in the through-hole of the magnetic core,
wherein,
the central rod includes a magnet part and a yoke part that holds the magnet part at a pen tip part of the central rod, and
the electronic pen further comprises a magnet disposed at a rear end of the electronic pen, the magnet having a magnetic pole opposite to a magnetic pole of the magnet part disposed at the pen tip part of the central rod.