| CPC G06F 3/04162 (2019.05) [G06F 3/03545 (2013.01); G06F 3/0383 (2013.01); G06F 3/0441 (2019.05); G06F 3/0442 (2019.05); G06F 3/0446 (2019.05); H04W 72/21 (2023.01); H04W 72/23 (2023.01); G06F 2203/0384 (2013.01); G06F 2203/04105 (2013.01)] | 5 Claims |
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1. An active pen that communicates with a sensor controller, the active pen comprising:
an electrode and a pen coil;
a transmission circuit that transmits a downlink signal to the sensor controller by changing a potential of the electrode; and
a reception circuit that receives an uplink signal transmitted in the form of a magnetic field generated by a loop coil of the sensor controller, by detecting an induced current generated in the pen coil,
wherein,
the transmission circuit and the reception circuit use a series of time slots to transmit downlink signals to the sensor controller and to receive uplink signals from the sensor controller, wherein the series of time slots are determined based on a reception timing by the active pen of one of the uplink signals transmitted from the sensor controller;
the transmission circuit, in operation, transmits a first downlink signal using a time within the series of time slots, and transmits a second downlink signal using both a time within the series of time slots and a time outside the series of time slots; and
the second downlink signal includes a first unit signal and a second unit signal, the first unit signal and the second unit signal each includes a gap, the gap included in the first unit signal is different in length from the gap included in the second unit signal, and the gap included in the first unit signal and the gap included in the second unit signal are each arranged between two temporally adjacent unit signals.
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