Position indicator and position indicating method
First Claim
Patent Images
1. A position indicator comprising:
- a resonant circuit which, in operation, receives electromagnetic waves transmitted intermittently from a position detection device with a first duration and a second duration, the second duration being shorter than the first duration; and
a load resistance value control circuit which, in operation, controls a load resistance of the resonant circuit such that different values of the load resistance are set for the first duration and the second duration, a value of the load resistance set for the second duration being smaller than a value of the load resistance set for the first duration,wherein the load resistance value control circuit includes;
a first switch which, in operation, switches between a first state in which both ends of a coil of the resonant circuit are shorted, and a second state in which the ends of the coil of the resonant circuit are not shorted, anda series circuit including a resistor and a second switch, wherein the second switch, in operation, switches between a first state in which the resistor and the second switch are connected in parallel with the resonant circuit, and a second state in which the resistor and the second switch are not connected in parallel with the resonant circuit, andwherein the resonant circuit, in operation, transmits a signal when the first switch is switched between the first and second states while the second switch is switched to and remains in the first state.
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Abstract
A position indicator includes a resonant circuit configured to receive electromagnetic waves transmitted intermittently from a position detection device with a first duration and a second duration. The second duration is shorter than the first duration. The position indicator also includes a load resistance value control circuit configured to control a load resistance of the resonant circuit such that different values of the load resistance are set for the first duration and the second duration. A value of the load resistance set for the second duration is smaller than a value of the load resistance set for the first duration.
14 Citations
12 Claims
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1. A position indicator comprising:
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a resonant circuit which, in operation, receives electromagnetic waves transmitted intermittently from a position detection device with a first duration and a second duration, the second duration being shorter than the first duration; and a load resistance value control circuit which, in operation, controls a load resistance of the resonant circuit such that different values of the load resistance are set for the first duration and the second duration, a value of the load resistance set for the second duration being smaller than a value of the load resistance set for the first duration, wherein the load resistance value control circuit includes; a first switch which, in operation, switches between a first state in which both ends of a coil of the resonant circuit are shorted, and a second state in which the ends of the coil of the resonant circuit are not shorted, and a series circuit including a resistor and a second switch, wherein the second switch, in operation, switches between a first state in which the resistor and the second switch are connected in parallel with the resonant circuit, and a second state in which the resistor and the second switch are not connected in parallel with the resonant circuit, and wherein the resonant circuit, in operation, transmits a signal when the first switch is switched between the first and second states while the second switch is switched to and remains in the first state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A position indicating method comprising:
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receiving, by a resonant circuit, electromagnetic waves transmitted intermittently from a position detection device with a first duration and a second duration, the second duration being shorter than the first duration; and controlling a load resistance of the resonant circuit, the controlling including setting different values of the load resistance for the first duration and the second duration, a value of the load resistance set for the second duration being smaller than a value of the load resistance set for the first duration, wherein the load resistance value control circuit includes; a first switch which, in operation, switches between a first state in which both ends of a coil of the resonant circuit are shorted, and a second state in which the ends of the coil of the resonant circuit are not shorted; and a series circuit including a resistor and a second switch, wherein the second switch, in operation, switches between a first state in which the resistor and the second switch are connected in parallel with the resonant circuit, and a second state in which the resistor and the second switch are not connected in parallel with the resonant circuit, and transmitting a signal from the resonant circuit, the controlling of the load resistance of the resonant circuit including switching the first switch between the first and second states to transmit the signal, and switching the second switch to the second state and keeping the second switch in the first state while the switching of the first switch is performed. - View Dependent Claims (10, 11, 12)
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Specification