US 12,229,352 B2
Electronic pen and core body for electronic pen
Kohei Tanaka, Saitama (JP); Takenori Kaneda, Saitama (JP); Hideyuki Hara, Saitama (JP); Noboru Yamaguchi, Saitama (JP); and Toru Tsunekawa, Saitama (JP)
Assigned to Wacom Co., Ltd., Saitama (JP)
Filed by Wacom Co., Ltd., Saitama (JP)
Filed on Oct. 23, 2023, as Appl. No. 18/492,604.
Application 18/492,604 is a continuation of application No. PCT/JP2022/017481, filed on Apr. 11, 2022.
Claims priority of application No. 2021-081590 (JP), filed on May 13, 2021; and application No. 2022-063329 (JP), filed on Apr. 6, 2022.
Prior Publication US 2024/0053836 A1, Feb. 15, 2024
Int. Cl. G06F 3/0354 (2013.01); G06F 3/038 (2013.01); G06F 3/044 (2006.01)
CPC G06F 3/03545 (2013.01) [G06F 3/0383 (2013.01); G06F 3/0441 (2019.05); G06F 3/0442 (2019.05)] 19 Claims
OG exemplary drawing
 
1. An electronic pen comprising:
a cylindrical housing including an opening portion on one end portion in an axial direction of the electronic pen;
a core body attached inside the housing such that a front end portion in the axial direction of the electronic pen protrudes from the opening portion of the housing; and
a signal generation circuit that, in operation, generates a signal to be transmitted from the core body, wherein:
the core body includes:
a core rod with conductivity that, in operation, receives the signal from the signal generation circuit, and
a protection member that covers the core rod,
the core rod includes a pen tip portion on a front end side, an installation portion on a rear end side, and an axis portion that connects the pen tip portion and the installation portion,
the axis portion of the core rod includes a front-side axis portion adjacent to the pen tip portion of the core rod, a rear-side axis portion adjacent to the installation portion of the core rod, and a middle axis portion that connects the front-side axis portion and the rear-side axis portion,
a diameter of the middle axis portion of the core rod is greater than a diameter of the front-side axis portion of the core rod, and
the core body includes a middle portion with a dielectric constant different from a dielectric constant of the protection member, the middle portion being provided around a side surface of the axis portion of the core rod such that the core rod is separated from the protection member.