Patents by Inventor Yuji Katsurahira
Yuji Katsurahira has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20200249792Abstract: A position indicator includes a housing and a first electrode and a second electrode disposed on a side of one end of the housing and a signal generating circuit which, in operation, generates a signal supplied to at least the first electrode. A capacitive interaction between the first electrode and a sensor of a position detecting device formed through supply of the signal to the first electrode. The second electrode surrounds the first electrode and the first electrode is partially exposed from the second electrode in an axial direction of the housing. The position indicator includes a signal transmission control circuit that is coupled to the second electrode and that, in operation, controls the second electrode to change the capacitive interaction between the first electrode and the sensor formed through supply of the signal from the signal generating circuit to the first electrode.Type: ApplicationFiled: April 22, 2020Publication date: August 6, 2020Inventor: Yuji Katsurahira
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Publication number: 20200225779Abstract: A position indicator has a pen-like appearance and interacts capacitively with a sensor of a position detection apparatus. The position indicator includes: a housing; a first electrode and a second electrode that are arranged at one end of the housing in an axial center direction thereof, wherein the second electrode encircles the first electrode, and first electrode is partially exposed from the housing in the axial center direction of the housing; and a signal transmission control circuit that supplies at least the first electrode with a first signal, wherein the first electrode outputs the first signal to interact capacitively with the sensor. The signal transmission control circuit is further configured to cause the second electrode to output a second signal that cancels out the first signal output from the first electrode.Type: ApplicationFiled: March 24, 2020Publication date: July 16, 2020Inventors: Yuji KATSURAHIRA, Hideyuki HARA
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Publication number: 20190294206Abstract: A low-power-consumption, noise-immune analog circuit for a position indicator is provided. The analog circuit provided by the present disclosure is connected to an electrode that receives a control signal by capacitive coupling, and includes an edge detection circuit and a waveform restoration circuit. The edge detection circuit detects rising and falling edges of the control signal received by the electrode. The waveform restoration circuit restores the waveform of the control signal in accordance with the rising and falling edges detected by the edge detection circuit.Type: ApplicationFiled: May 20, 2019Publication date: September 26, 2019Inventors: Yuji Katsurahira, Takeshi Koike, Hideyuki Hara
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Patent number: 10379642Abstract: A position indicating device includes a variable capacitance capacitor, which has: a first electrode; a second electrode; and a dielectric separating the first electrode and the second electrode. A capacitance of the variable capacitance capacitor varies in response to application of pressure to the variable capacitance capacitor. The position indicating device also includes a core body having a tip including a third electrode, wherein, in operation, a signal is transmitted by the third electrode and pressure applied to the tip of the core body is transmitted to the variable capacitance capacitor, varying the capacitance of the variable capacitance capacitor. The position indicating device also includes a first terminal electrically connected to the first electrode; a second terminal electrically connected to the second electrode; a third terminal; and a core body holder configured to electrically connect the third electrode to the third terminal.Type: GrantFiled: April 18, 2019Date of Patent: August 13, 2019Assignee: Wacom Co., Ltd.Inventor: Yuji Katsurahira
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Publication number: 20190243473Abstract: A position indicating device includes a variable capacitance capacitor, which has: a first electrode; a second electrode; and a dielectric separating the first electrode and the second electrode. A capacitance of the variable capacitance capacitor varies in response to application of pressure to the variable capacitance capacitor. The position indicating device also includes a core body having a tip including a third electrode, wherein, in operation, a signal is transmitted by the third electrode and pressure applied to the tip of the core body is transmitted to the variable capacitance capacitor, varying the capacitance of the variable capacitance capacitor. The position indicating device also includes a first terminal electrically connected to the first electrode; a second terminal electrically connected to the second electrode; a third terminal; and a core body holder configured to electrically connect the third electrode to the third terminal.Type: ApplicationFiled: April 18, 2019Publication date: August 8, 2019Inventor: Yuji Katsurahira
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Patent number: 10331243Abstract: A position indicating device includes a variable capacitance capacitor, which has: a first electrode; a second electrode; and a dielectric separating the first electrode and the second electrode. A capacitance of the variable capacitance capacitor varies in response to application of pressure to the variable capacitance capacitor. The position indicating device also includes a core body having a tip including a third electrode, wherein, in operation, a signal is transmitted by the third electrode and pressure applied to the tip of the core body is transmitted to the variable capacitance capacitor, varying the capacitance of the variable capacitance capacitor. The position indicating device also includes a first terminal electrically connected to the first electrode; a second terminal electrically connected to the second electrode; a third terminal; and a core body holder configured to electrically connect the third electrode to the third terminal.Type: GrantFiled: June 21, 2016Date of Patent: June 25, 2019Assignee: Wacom Co., Ltd.Inventor: Yuji Katsurahira
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Patent number: 10296039Abstract: A low-power-consumption, noise-immune analog circuit for a position indicator is provided. The analog circuit provided by the present disclosure is connected to an electrode that receives a control signal by capacitive coupling, and includes an edge detection circuit and a waveform restoration circuit. The edge detection circuit detects rising and falling edges of the control signal received by the electrode. The waveform restoration circuit restores the waveform of the control signal in accordance with the rising and falling edges detected by the edge detection circuit.Type: GrantFiled: December 5, 2017Date of Patent: May 21, 2019Assignee: Wacom Co., Ltd.Inventors: Yuji Katsurahira, Takeshi Koike, Hideyuki Hara
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Patent number: 10185412Abstract: A position indicator is provided, which includes a pressure sensor configured to detect a pressure applied to a tip of the position indicator. The position indicator further includes a storage configured to store the pressure as one type of digital data and to store at least one other type of digital data. The position indicator also includes a receiver configured to receive a command signal transmitted from a position sensor, and a control circuit configured to select one or more types of digital data in the storage based on the command signal. The position indicator includes a transmitter configured to transmit the selected one or more types of digital data to the position sensor.Type: GrantFiled: March 16, 2017Date of Patent: January 22, 2019Assignee: Wacom Co., Ltd.Inventor: Yuji Katsurahira
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Patent number: 10185411Abstract: A position indicator is provided, which includes a pressure sensor configured to detect a pressure applied to a tip of the position indicator. The position indicator further includes a storage configured to store the pressure as one type of digital data and to store at least one other type of digital data. The position indicator also includes a receiver configured to receive a command signal transmitted from a position sensor, and a control circuit configured to select one or more types of digital data in the storage based on the command signal. The position indicator includes a transmitter configured to transmit the selected one or more types of digital data to the position sensor.Type: GrantFiled: March 15, 2017Date of Patent: January 22, 2019Assignee: Wacom Co., Ltd.Inventor: Yuji Katsurahira
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Patent number: 10055035Abstract: A remaining amount of power stored in a position indicator can be recognized at plural levels. The position indicator includes a power storage device, an alternating current (AC) signal generating circuit that generates an AC signal to be transmitted toward a tablet, a modulation circuit that modulates the AC signal according to position indicator information represented by a binary code, and an electricity remaining amount detecting circuit that detects an electricity remaining amount of the power storage device. The frequency at which a specific bit of the position indicator information is set to 0 or 1 is changed according to the detected electricity remaining amount. The tablet includes a receiver that receives the position indicator information from the position indicator, and detects the electricity remaining amount of the power storage device from the frequency at which the specific bit of the received position indicator information is 0 or 1.Type: GrantFiled: March 7, 2016Date of Patent: August 21, 2018Assignee: Wacom Co., Ltd.Inventor: Yuji Katsurahira
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Publication number: 20180232070Abstract: A method is disclosed to detect a tilt angle of a pen-shaped position indicator relative to a sensor surface of a tablet. The position indicator includes a first pen electrode and a second pen electrode. The sensor surface includes X electrodes and Y electrodes that intersect each other. The position indicator transmits a first signal from the first pen electrode and a second signal from the second pen electrode. The tablet detects a first signal intensity level V1 of the first signal based on a highest signal level Vpx1 detected in one of the X electrodes in response to the first signal, and detects a second signal intensity level V2 of the second signal based on a highest signal level Vpx2 detected in one of the X electrodes in response to the second signal. The tablet determines a tilt angle of the pen-shaped position indicator relative to the sensor surface based on a difference between the first signal intensity level V1 and the second signal intensity level V2.Type: ApplicationFiled: April 10, 2018Publication date: August 16, 2018Inventor: Yuji Katsurahira
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Publication number: 20180101250Abstract: 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.Type: ApplicationFiled: December 12, 2017Publication date: April 12, 2018Inventors: Yuji Katsurahira, Hideyuki Hara
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Publication number: 20180095495Abstract: A low-power-consumption, noise-immune analog circuit for a position indicator is provided. The analog circuit provided by the present disclosure is connected to an electrode that receives a control signal by capacitive coupling, and includes an edge detection circuit and a waveform restoration circuit. The edge detection circuit detects rising and falling edges of the control signal received by the electrode. The waveform restoration circuit restores the waveform of the control signal in accordance with the rising and falling edges detected by the edge detection circuit.Type: ApplicationFiled: December 5, 2017Publication date: April 5, 2018Inventors: Yuji Katsurahira, Takeshi Koike, Hideyuki Hara
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Publication number: 20180011557Abstract: An electronic pen includes a magnetic core that has a through-hole and around which a coil is wound in a direction along this through-hole, a core body that is inserted in the through-hole of this magnetic core and has electrical conductivity, a capacitor that forms a resonant circuit with the coil, a signal generation circuit that generates a signal that enables a position of the electronic pen to be detected, which is transmitted through the core body, an electricity storage device, and a charge circuit that charges the electricity storage device by an induced current generated in the coil according to an external magnetic field. While the resonant circuit operates, the signal generated by the signal generation circuit is concurrently transmitted through the core body.Type: ApplicationFiled: September 6, 2017Publication date: January 11, 2018Inventors: Yuji Katsurahira, Toru Eguchi
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Patent number: 9778761Abstract: A capacitive stylus pen that inputs an indicated position by capacitive coupling with a tablet is provided. The capacitive stylus pen includes a power supply that is charged in a contactless manner, a coil provided at a position indicating part of the capacitive stylus pen, an electrode that penetrates through the coil and protrudes to form a tip part, and an alternating-current signal generating circuit that supplies an alternating-current signal to the electrode. During contactless charging, the coil is magnetically coupled to an external charge device that has a penholder shape, to thereby charge the power supply, which supplies power to the alternating-current signal generating circuit.Type: GrantFiled: December 12, 2013Date of Patent: October 3, 2017Assignee: Wacom Co., Ltd.Inventor: Yuji Katsurahira
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Publication number: 20170269776Abstract: A position detecting device obtains information from a stylus when the stylus moves at high speed, while removing influences of noise. The position detecting device includes a differential amplification circuit that amplifies and outputs a difference in a signal at a first terminal and a signal at a second terminal, and a selection circuit that selects at least a first electrode of a sensor, connects at least the first electrode to the first terminal of the differential amplification circuit, selects at least a second electrode of the sensor, and connects at least the second electrode to the second terminal of the differential amplification circuit. The selection circuit selects electrodes separated by a first interval in a period in which a position indicated by the stylus is detected, and selects electrodes separated by a second interval that is shorter than the first interval in a period in which data is detected.Type: ApplicationFiled: June 2, 2017Publication date: September 21, 2017Inventor: Yuji Katsurahira
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Publication number: 20170185175Abstract: A position indicator is provided, which includes a pressure sensor configured to detect a pressure applied to a tip of the position indicator. The position indicator further includes a storage configured to store the pressure as one type of digital data and to store at least one other type of digital data. The position indicator also includes a receiver configured to receive a command signal transmitted from a position sensor, and a control circuit configured to select one or more types of digital data in the storage based on the command signal. The position indicator includes a transmitter configured to transmit the selected one or more types of digital data to the position sensor.Type: ApplicationFiled: March 15, 2017Publication date: June 29, 2017Inventor: Yuji Katsurahira
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Publication number: 20170185176Abstract: A position indicator is provided, which includes a pressure sensor configured to detect a pressure applied to a tip of the position indicator. The position indicator further includes a storage configured to store the pressure as one type of digital data and to store at least one other type of digital data. The position indicator also includes a receiver configured to receive a command signal transmitted from a position sensor, and a control circuit configured to select one or more types of digital data in the storage based on the command signal. The position indicator includes a transmitter configured to transmit the selected one or more types of digital data to the position sensor.Type: ApplicationFiled: March 16, 2017Publication date: June 29, 2017Inventor: Yuji Katsurahira
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POSITION DETECTOR FILTERING SENSED FINGER AND STYLUS SIGNALS IN SYNCHRONIZATION WITH DISPLAY REFRESH
Publication number: 20170115824Abstract: A position detecting device detects both a finger and a stylus radiating an electric field. The device includes: a substantially transparent sensor disposed on a display device and formed by X-electrodes and Y-electrodes; an X-selecting circuit for selecting two sets of X-electrodes as a positive terminal and a negative terminal; a Y-selecting circuit for selecting two sets of Y-electrodes as a positive terminal and a negative terminal; a driving signal generating circuit for generating signals shifted in phase from each other by 180° as a positive signal and a negative signal; a differential amplifier for amplifying a difference between signals occurring in the positive terminal and the negative terminal selected by one, or respectively each, of the X-selecting circuit and the Y-selecting circuit; and a balanced switching circuit for switching connection of the positive terminal and the negative terminal to the driving signal generating circuit or to the differential amplifier.Type: ApplicationFiled: January 6, 2017Publication date: April 27, 2017Inventor: Yuji Katsurahira -
Patent number: 9600096Abstract: A position detecting device includes a sensor having electrodes that receive an alternating current (AC) signal from a capacitive stylus pen that transmits the AC signal. The position detecting device detects a position indicated by the stylus pen on the sensor. The position detecting device also includes: an electrode selection circuit that selects electrodes provided in the sensor for connection to a positive terminal and a negative terminal; a differential amplifier that amplifies and outputs a signal indicating a difference between signals generated at the positive terminal and the negative terminal; a height detector that obtains a height of the stylus pen relative to a sensor surface of the sensor; and a control unit that causes a selection pattern of the electrodes selected for connection to the positive terminal and the negative terminal by the electrode selection circuit to change according to the height obtained by the height detector.Type: GrantFiled: June 5, 2015Date of Patent: March 21, 2017Assignee: Wacom Co., Ltd.Inventors: Yuji Katsurahira, Sadao Yamamoto