Abstract: A method of palm rejection is executed by a sensor controller that is connected to a plurality of sensor electrodes and that detects a downlink signal transmitted from an active pen. The method includes determining whether or not a phase of the detected downlink signal matches a phase shared in advance between the sensor controller and the active pen, and outputting, when it is determined that the phases match, a position of the active pen derived on the basis of a distribution of levels of the downlink signal in the plurality of sensor electrodes.

Abstract: Provided are a pen state detection circuit, a pen state detection system, and a pen state detection method that can improve estimation accuracy for a pen state in an electronic pen including at least one electrode. A pen state detection circuit acquires, from a touch sensor, a first signal distribution indicating a change in capacitance associated with approach of a first electrode and uses a machine learning estimator to estimate an instruction position or an inclination angle of an electronic pen from first feature values related to the first signal distribution. 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.

Abstract: An auxiliary device according to the present disclosure includes a ruler part, a plurality of electrodes provided at the ruler part, a receiving electrode for receiving an uplink signal transmitted from a sensor controller, and a processor that transmits a downlink signal to the sensor controller while sequentially switching the plurality of electrodes in response to reception of the uplink signal.

Abstract: An electronic pent includes a case, a core body, and a signal generation circuit. The core body is attached inside the case such that a front end portion in an axial direction protrudes from an opening portion of the case. The signal generation circuit generates a signal to be transmitted from the core body. The core body includes a core rod and a protection member that covers a pen tip portion and an axis portion of the core rod. The core body is provided with a middle portion with a dielectric constant different from a dielectric constant of the protection member, the middle portion being provided around a side surface of the axis portion of the core rod such that the core rod is separated from the protection member.

Abstract: A method of palm rejection is executed by a sensor controller that is connected to a plurality of sensor electrodes and that detects a downlink signal transmitted from an active pen. The method includes determining whether or not a phase of the detected downlink signal matches a phase shared in advance between the sensor controller and the active pen, and outputting, when it is determined that the phases match, a position of the active pen derived on the basis of a distribution of levels of the downlink signal in the plurality of sensor electrodes.

Abstract: One first connector head 21A and one second connector head 22A face each other, in the plane view of a connector terminal assembly 19, with the axial line of an output shaft 12, which is the axial line of the motor rotation shaft of an electric motor, therebetween without being offset from each other. The other first connector head 21B and the other second connector head 22B face each other, in the plane view of the connector terminal assembly 19, with the axial line of the output shaft 12, which is the axial line of the motor rotation shaft of the electric motor, therebetween without being offset from each other.

Abstract: Disclosed is an electronic pen that includes a conductive core body, a power supply circuit, a first signal generation circuit which receives power from the power supply circuit and generates a first signal, and a second signal generation circuit which receives power from the power supply circuit and generates a second signal different from the first signal, and an operation switch which sets an operation mode of the electronic pen to either a first operation mode or a second operation mode. While the operation mode of the electronic pen is set to the first operation mode, the conductive core body transmits the first signal generated by the first signal generation circuit. While the operation mode of the electronic pen is set to the second operation mode, the conductive core body transmits the second signal generated by the second signal generation circuit.

Abstract: Provided are a pen state detection circuit, a pen state detection system, and a pen state detection method that can improve estimation accuracy for a pen state in an electronic pen including at least one electrode. A pen state detection circuit acquires, from a touch sensor, a first signal distribution indicating a change in capacitance associated with approach of a first electrode and uses a machine learning estimator to estimate an instruction position or an inclination angle of an electronic pen from first feature values related to the first signal distribution. 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.

Abstract: An active pen that is used together with a sensor controller includes: an electrode provided at a pen tip, a memory that stores identification data, and a processor connected to the electrode and the memory. The processor returns, as a response to a first uplink signal transmitted from the sensor controller, a response signal including the identification data stored by the memory, and decides, based on whether data corresponding to the identification data is included in a second uplink signal received after the response signal is transmitted, whether the active pen is detected by the sensor controller.

Abstract: A signal transmission method is provided, which may be implemented by a position indicator. The signal transmission method includes a step of dividing first information, which is represented in a digital signal of a first defined number of bits, into a plurality of information parts respectively represented in digital signals of a second defined number of bits smaller than the first defined number of bits. The signal transmission method includes a step of transmitting, from the position indicator to a position detecting device, the information parts, and distinguishing information usable for distinguishing the information parts from each other, wherein each of the information parts is transmitted with second information different from the first information.

Abstract: Provided is a communication method for communication performed between a pen and a sensor controller that, in operation, transmits uplink signals to the pen in a frame cycle. The communication method includes transmitting, by the sensor controller, a first uplink signal in a first frame, the first uplink signal including an identifier that identifies a type of data to be transmitted to the pen in a second frame following the first frame, and transmitting, by the sensor controller, a second uplink signal in the second frame, the second uplink signal including a value of the data of the type indicated by the identifier.

Abstract: A method to be performed by a sensor controller that periodically transmits an uplink signal, and by a stylus that, upon receiving the uplink signal, determines a transmission and reception schedule for a downlink signal and the uplink signal on the basis of the reception timing of the uplink signal. The method includes executing, by the stylus, an uplink signal receiving operation for a first predetermined period of time according to the transmission and reception schedule. The method includes, responsive to the uplink signal not received through the receiving operation and expiration of the first predetermined period of time, continuing, by the stylus, the uplink signal receiving operation for a second predetermined period of time, instead of transmitting the downlink signal according to the transmission and reception schedule.

Abstract: An active stylus is provided, which can reduce battery power consumption and reduce the time required for its signal transmission. A position detection device includes a tablet and the stylus having a built-in power source, which are capable of bi-directional transmission and reception of signals through capacitive coupling therebetween. The tablet is configured to transmit a trigger signal US_trg and then transmit a command signal US_cmd to the stylus. The trigger signal US_trg causes the stylus to start its command information receiver to receive the command signal US_cmd including information for controlling the stylus.

Abstract: An active pen that is used together with a sensor controller includes: an electrode provided at a pen tip, a memory that stores identification data, and a processor connected to the electrode and the memory. The processor returns, as a response to a first uplink signal transmitted from the sensor controller, a response signal including the identification data stored by the memory, and decides, based on whether data corresponding to the identification data is included in a second uplink signal received after the response signal is transmitted, whether the active pen is detected by the sensor controller.

Abstract: A signal transmission method is provided, which may be implemented by a position indicator. The signal transmission method includes a step of dividing first information, which is represented in a digital signal of a first defined number of bits, into a plurality of information parts respectively represented in digital signals of a second defined number of bits smaller than the first defined number of bits. The signal transmission method includes a step of transmitting, from the position indicator to a position detecting device, the information parts, and distinguishing information usable for distinguishing the information parts from each other, wherein each of the information parts is transmitted with second information different from the first information.

Abstract: Provided is a communication method for communication performed between a pen and a sensor controller that, in operation, transmits uplink signals to the pen in a frame cycle. The communication method includes transmitting, by the sensor controller, a first uplink signal in a first frame, the first uplink signal including an identifier that identifies a type of data to be transmitted to the pen in a second frame following the first frame, and transmitting, by the sensor controller, a second uplink signal in the second frame, the second uplink signal including a value of the data of the type indicated by the identifier.

Abstract: An element-side connection terminal (40) extending from a power conversion circuit unit (16) includes a first connection terminal portion (40A) that extends in a direction intersecting a direction of extension of a counterpart-side connection terminal (38); and a second connection terminal portion (40B) that is bent at a point before the first connection terminal portion (40A) reaches the counterpart-side connection terminal (38) in a direction to intersect the direction of extension of the counterpart-side connection terminal (38) such that the second connection terminal portion (40B) is provided with elasticity and is in an elastic contact with the counterpart-side connection terminal (38) at an angle. A tip end side (38T) of the counterpart-side connection terminal (38) and a tip end side (40T) of the second connection terminal portion (40B) are electrically joined.

Abstract: An active stylus is provided, which can reduce battery power consumption and reduce the time required for its signal transmission. A position detection device includes a tablet and the stylus having a built-in power source, which are capable of bi-directional transmission and reception of signals through capacitive coupling therebetween. The tablet is configured to transmit a trigger signal US_trg and then transmit a command signal US_cmd to the stylus. The trigger signal US_trg causes the stylus to start its command information receiver to receive the command signal US_cmd including information for controlling the stylus.

Abstract: A method to be performed by a sensor controller that periodically transmits an uplink signal, and by a stylus that, upon receiving the uplink signal, determines a transmission and reception schedule for a downlink signal and the uplink signal on the basis of the reception timing of the uplink signal. The method includes executing, by the stylus, an uplink signal receiving operation for a first predetermined period of time according to the transmission and reception schedule. The method includes, responsive to the uplink signal not received through the receiving operation and expiration of the first predetermined period of time, continuing, by the stylus, the uplink signal receiving operation for a second predetermined period of time, instead of transmitting the downlink signal according to the transmission and reception schedule.

Abstract: A position detection device includes a position detection sensor and selection circuitry. The position detection sensor has first loop electrodes arranged in a first direction and second loop electrodes arranged in a second direction perpendicular to the first direction. The selection circuitry is coupled to the first loop electrodes of the position detection sensor and, in operation, simultaneously selects two of the first loop electrodes, connects a first terminal of each of the two of the first loop electrodes to a first one of two first common terminals, and connects a second terminal of each of the two of first loop electrodes to a second one of the two first common terminals. The two of the first loop electrodes change sequentially over time from a first two of the plurality of first loop electrodes to a last two of the plurality of first loop electrodes.