US 12,216,846 B2
Pen state detection circuit, system, and method
Koichi Maeyama, Saitama (JP); and Hideyuki Hara, Saitama (JP)
Assigned to Wacom Co., Ltd., Saitama (JP)
Filed by Wacom Co., Ltd., Saitama (JP)
Filed on Dec. 11, 2023, as Appl. No. 18/535,311.
Application 18/535,311 is a continuation of application No. 18/150,084, filed on Jan. 4, 2023, granted, now 11,841,999.
Application 18/150,084 is a continuation of application No. 17/406,717, filed on Aug. 19, 2021, granted, now 11,604,521, issued on Mar. 14, 2023.
Application 17/406,717 is a continuation of application No. PCT/JP2020/002615, filed on Jan. 24, 2020.
Claims priority of application No. PCT/JP2019/014260 (WO), filed on Mar. 29, 2019.
Prior Publication US 2024/0111372 A1, Apr. 4, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G06F 3/0354 (2013.01); G06F 3/041 (2006.01); G06F 3/044 (2006.01)
CPC G06F 3/03545 (2013.01) [G06F 3/0418 (2013.01); G06F 3/0442 (2019.05); G06F 3/0446 (2019.05); G06F 2203/04106 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A pen state detection circuit that detects a state of an electronic pen including a first electrode, on a basis of a signal distribution detected by a capacitance touch sensor including a plurality of sensor electrodes arranged in a plane shape,
the pen state detection circuit executing:
an acquisition step of acquiring, from the touch sensor, a first signal distribution indicating a change in capacitance associated with approach of the first electrode, and
an estimation step of using a machine learning estimator to estimate an instruction position or an inclination angle of the electronic pen from first feature values related to the first signal distribution,
wherein
the first feature values include first local feature values related to a first local distribution corresponding to sensor electrodes in a number fewer than the number of arranged sensor electrodes exhibiting the first signal distribution and a reference position of the first local distribution in a sensor coordinate system defined on a detection surface of the touch sensor.