19014936. ACTIVE PEN, SENSOR CONTROLLER, AND POSITION DETECTION DEVICE CONFIGURED FOR BIDIRECTION COMMUNICATION USING TIME SLOTS (Wacom Co., Ltd.)
ACTIVE PEN, SENSOR CONTROLLER, AND POSITION DETECTION DEVICE CONFIGURED FOR BIDIRECTION COMMUNICATION USING TIME SLOTS
Organization Name
Inventor(s)
Masayuki Miyamoto of Saitama JP
ACTIVE PEN, SENSOR CONTROLLER, AND POSITION DETECTION DEVICE CONFIGURED FOR BIDIRECTION COMMUNICATION USING TIME SLOTS
This abstract first appeared for US patent application 19014936 titled 'ACTIVE PEN, SENSOR CONTROLLER, AND POSITION DETECTION DEVICE CONFIGURED FOR BIDIRECTION COMMUNICATION USING TIME SLOTS
Original Abstract Submitted
An active pen communicates with a sensor controller using a series of time slots, to receive uplink signals from and transmit downlink signals to the sensor controller. The series of time slots are determined based on the reception timing, by the active pen, of an uplink signal used as a reference time. The active pen determines whether or not the uplink signal is received and, if yes, the active pen transmits a first downlink signal using a time within the series of time slots. If no, the active pen transmits a second downlink signal using both a time within the series of time slots and a time outside the series of time slots. The second downlink signal is formed by repeating a unit signal that is shorter in duration than each of the series of time slots, to ensure reception by the sensor controller of at least one unit signal.
