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US 12,675,200 B2Granted
Position detecting device, electromagnetic resonance stylus, and position detecting system
AssigneeWacom Co., Ltd.
InventorKoji Noguchi
Life of this patent
Estimating the term…
Abstract
To be able to transmit data from an electromagnetic resonance stylus to a position detecting device while the position detecting device is energizing its loop coils. An electromagnetic resonance stylus according to the present disclosure includes a resonant circuit including a coil and a capacitor, a switch element connected parallel to the capacitor, and a processing circuit for transmitting data to a position detecting device by performing on/off control on the switch element based on the data to be transmitted to the position detecting device.
Claims6
A position detecting device comprising:
- a plurality of first loop coils arrayed in a first direction;
- a plurality of second loop coils arrayed in a second direction perpendicular to the first direction;
- and
- a sensor controller which, in operation, detects induced currents respectively in the second loop coils while energizing one of the first loop coils,
- wherein the sensor controller, in operation, derives a position of an electromagnetic resonance stylus in at least the second direction based on a distribution of levels of the induced currents detected and acquires data transmitted by the electromagnetic resonance stylus by performing on-off keying modulation on the induced currents detected, and
- wherein the sensor controller, in operation, derives the position of the electromagnetic resonance stylus and acquires the data transmitted by the electromagnetic resonance stylus,
- using a current calculated by subtracting, from one of the induced currents detected in one of the second loop coils that is positioned at a first end in the second direction among the second loop coils, one of the induced currents detected in one of the second loop coils that is positioned at a second end in the second direction among the second loop coils, as the one of the induced currents detected in the one of the second loop coils that is positioned at the first end in the second direction among the second loop coils, and
- using a current calculated by subtracting the one of the induced currents detected in the one of the second loop coils that is positioned at the first end in the second direction among the second loop coils from the one of the induced currents detected in the one of the second loop coils that is positioned at the second end in the second direction among the second loop coils, as the one of the induced currents detected in the one of the second loop coils that is positioned at the second end in the second direction among the second loop coils.
5 more elements
An electromagnetic resonance stylus comprising:
- a resonant circuit including a coil and a capacitor;
- a switch element connected parallel to the capacitor;
- and
- a processing circuit which, in operation, transmits data to a position detecting circuit by performing on/off control on the switch element according to the data to be transmitted to the position detecting circuit,
- wherein the processing circuit, in operation:
- detects an alternating current generated in the resonant circuit by an alternating magnetic field intermittently transmitted by the position detecting circuit, and
- detects a timing for the position detecting device to newly transmit the alternating magnetic field based on a result of the detection of the alternating current, and performs the on/off control on the switch element based on the timing detected,
- wherein the position detecting circuit is coupled to a plurality of first loop coils arrayed in a first direction and a plurality of second loop coils arrayed in a second direction perpendicular to the first direction, and
- wherein the position detecting circuit, in operation:
- derives the position of the electromagnetic resonance stylus and acquires the data transmitted by the electromagnetic resonance stylus,
- using a current calculated by subtracting, from one of a plurality of induced currents detected in one of the second loop coils that is positioned at a first end in the second direction among the second loop coils, one of the induced currents detected in one of the second loop coils that is positioned at a second end in the second direction among the second loop coils, as the one of the induced currents detected in the one of the second loop coils that is positioned at the first end in the second direction among the second loop coils, and
- using a current calculated by subtracting the one of the induced currents detected in the one of the second loop coils that is positioned at the first end in the second direction among the second loop coils from the one of the induced currents detected in the one of the second loop coils that is positioned at the second end in the second direction among the second loop coils, as the one of the induced currents detected in the one of the second loop coils that is positioned at the second end in the second direction among the second loop coils.
9 more elements
A position detecting system comprising:
- an electromagnetic resonance stylus;
- and
- a position detecting device,
- wherein the electromagnetic resonance stylus includes:
- a resonant circuit including a coil and a capacitor,
- a switch element connected parallel to the capacitor, and
- a processing circuit which, in operation, transmits data to the position detecting circuit by performing on/off control on the switch element according to the data to be transmitted to the position detecting circuit,
- wherein the position detecting device includes:
- a plurality of first loop coils arrayed in a first direction,
- a plurality of second loop coils arrayed in a second direction perpendicular to the first direction, and
- a sensor controller which, in operation, detects induced currents respectively in the second loop coils while energizing one of the first loop coils, and
- wherein the sensor controller, in operation, derives a position of the electromagnetic resonance stylus in at least the second direction based on a distribution of levels of the induced currents detected and acquires data transmitted by the electromagnetic resonance stylus by performing on-off keying modulation on the induced currents detected, and
- wherein the sensor controller, in operation, derives the position of the electromagnetic resonance stylus and acquires the data transmitted by the electromagnetic resonance stylus,
- using a current calculated by subtracting, from one of the induced currents detected in one of the second loop coils that is positioned at a first end in the second direction among the second loop coils, one of the induced currents detected in one of the second loop coils that is positioned at a second end in the second direction among the second loop coils, as the one of the induced currents detected in the one of the second loop coils that is positioned at the first end in the second direction among the second loop coils, and
- using a current calculated by subtracting the one of the induced currents detected in the one of the second loop coils that is positioned at the first end in the second direction among the second loop coils from the one of the induced currents detected in the one of the second loop coils that is positioned at the second end in the second direction among the second loop coils, as the one of the induced currents detected in the one of the second loop coils that is positioned at the second end in the second direction among the second loop coils.
12 more elements
Dependencies are inferred from the claim text.