US 12,271,539 B2
Electronic pen, electronic pen cartridge, and electronic pen charging tray
Shinya Aoki, Saitama (JP); Takenori Kaneda, Saitama (JP); Yoshiyuki Hashimoto, Saitama (JP); and Toru Eguchi, Saitama (JP)
Assigned to Wacom Co., Ltd., Saitama (JP)
Filed by Wacom Co., Ltd., Saitama (JP)
Filed on Sep. 1, 2023, as Appl. No. 18/460,398.
Application 18/460,398 is a continuation of application No. 17/741,664, filed on May 11, 2022, granted, now 11,782,526.
Application 17/741,664 is a continuation of application No. PCT/JP2021/000665, filed on Jan. 12, 2021.
Claims priority of application No. 2020-007229 (JP), filed on Jan. 21, 2020.
Prior Publication US 2023/0409129 A1, Dec. 21, 2023
Int. Cl. G06F 3/0354 (2013.01); G06F 1/26 (2006.01); G06F 3/038 (2013.01); G06F 3/046 (2006.01)
CPC G06F 3/03545 (2013.01) [G06F 1/26 (2013.01); G06F 3/0383 (2013.01); G06F 3/046 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An electronic pen cartridge housed in a tubular pen housing of an electronic pen such that at least a pen tip is projectable from an opening on one side in an axial direction of the pen housing, the electronic pen cartridge comprising:
a tubular cartridge housing;
a conductive center electrode having one end in an axial direction thereof that serves as the pen tip;
a peripheral electrode disposed to surround the center electrode except for at least the pen tip and insulated from the center electrode;
a signal transmission circuit configured to generate a signal;
a first switch circuit configured to be turned on to supply the signal to the conductive center electrode;
a second switch circuit configured to be turned on to supply the signal to the peripheral electrode;
a control circuit configured to turn on the first switch circuit and the second switch circuit in a time division manner;
a rechargeable power storage device that is disposed in the cartridge housing and that is configured to supply a power supply voltage to the signal transmission circuit; and
a coil wound around a portion of the cartridge housing, wherein the coil is not wound around a ferrite core,
wherein the power storage device is configured to be charged by a current induced in the coil based on an externally supplied magnetic field.