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    • 91. 发明授权
    • Pen detection system
    • US11604546B2
    • 2023-03-14
    • US17585940
    • 2022-01-27
    • Wacom Co., Ltd.
    • Tomohiro Kagami
    • G06F3/044G06F3/0354G06F3/047
    • A pen detection system is provided that detects a pen signal transmitted from a pen to detect a position of the pen. The system includes a sensor pattern in which an electrode group including first and second partial electrode groups is disposed; a first integrated circuit that is connected to the first partial electrode group to acquire a level distribution of the pen signal in the first partial electrode group; and a second integrated circuit that is connected to the second partial electrode group to acquire a level distribution of the pen signal in the second partial electrode group. A predetermined number of boundary electrodes positioned near a boundary of the first partial electrode group and the second partial electrode group among a plurality of electrodes included in the electrode group are connected to both of the first and second integrated circuits, wherein the predetermined number is an even number.
    • 93. 发明授权
    • Active pen and sensor integrated circuit
    • US11599227B2
    • 2023-03-07
    • US17683914
    • 2022-03-01
    • Wacom Co., Ltd.
    • Masayuki Miyamoto
    • G06F3/044H04W72/04H04W72/0446H04W72/0453
    • An active pen is provided, which facilitates avoiding complex computation for phase acquisition on the side of a sensor integrated circuit configured to receive downlink signals from active pens, and allows for generating carrier waves for the downlink signals using a simple configuration, namely, a frequency dividing circuit, while reducing a difference in unused time in one time slot between the active pens. An active pen 2 is configured to transmit one or more symbol values in one time slot, and includes a frequency dividing circuit 43 configured to frequency-divide a reference clock with a frequency division ratio based on each of a plurality of frequencies different from each other, to thereby generate a plurality of carrier waves having frequencies different from each other. The active pen 2 includes a modulation (transmission) circuit 44 configured to transmit a first downlink signal in a symbol duration that is common among the plurality of frequencies, the first downlink signal obtained by modulating a first carrier wave, which is among the plurality of carrier waves generated by the frequency dividing circuit 43, with a value of a first symbol that is a transmission target.