Position pointing device
First Claim
1. A position pointing device comprising:
- a resonant circuit;
a resonance-characteristic control circuit for controlling characteristics of the resonant circuit in accordance with pointing-device information at timing synchronized with at least part of an electromagnetic wave that is intermittently transmitted from a tablet and for returning the pointing-device information to the tablet;
a clock oscillator circuit for generating a clock signal for driving the resonance-characteristic control circuit;
clock starting means for stopping an operation of the clock oscillator circuit when a start condition is set and for starting the operation of the clock oscillator circuit when the resonant circuit generates a signal specified by the start condition, wherein the start condition specifies that, in response to what type of signal generated at the resonant circuit, the clock oscillator circuit is to be started; and
start-condition setting means for setting the start condition in the clock starting means at timing in accordance with an operation of the resonance-characteristic control circuit, the start condition corresponding to content of controlling performed by the resonance-characteristic control circuit.
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Accused Products
Abstract
A position pointing device includes a resonant circuit, a resonance-characteristic control circuit for controlling characteristics of the resonant circuit in accordance with pointing-device information at timing synchronized with at least part of an electromagnetic wave that is intermittently transmitted from a tablet and for returning the pointing-device information to the tablet, a clock oscillator circuit for generating a clock signal for driving the resonance-characteristic control circuit, and clock starting means for stopping an operation of the clock oscillator circuit when a start condition is set and for starting the operation of the clock oscillator circuit when the resonant circuit generates a signal specified by the start condition. The position pointing device further includes start-condition setting means for setting the start condition in the clock starting means at timing in accordance with an operation of the resonance-characteristic control circuit.
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Citations
20 Claims
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1. A position pointing device comprising:
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a resonant circuit;
a resonance-characteristic control circuit for controlling characteristics of the resonant circuit in accordance with pointing-device information at timing synchronized with at least part of an electromagnetic wave that is intermittently transmitted from a tablet and for returning the pointing-device information to the tablet;
a clock oscillator circuit for generating a clock signal for driving the resonance-characteristic control circuit;
clock starting means for stopping an operation of the clock oscillator circuit when a start condition is set and for starting the operation of the clock oscillator circuit when the resonant circuit generates a signal specified by the start condition, wherein the start condition specifies that, in response to what type of signal generated at the resonant circuit, the clock oscillator circuit is to be started; and
start-condition setting means for setting the start condition in the clock starting means at timing in accordance with an operation of the resonance-characteristic control circuit, the start condition corresponding to content of controlling performed by the resonance-characteristic control circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for transmitting information from a cordless, batteryless pointing device to a digitizer or tablet configured to detect the position of the pointing device, comprising the method steps of:
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(a) providing a digitizer adapted to transmit an electromagnetic digitizer signal at a first selected frequency;
(b) providing a cordless, batteryless pointing device including a resonant circuit that is responsive to the electromagnetic digitizer signal to generate a pointing device resonant signal;
(c) transmitting an electromagnetic digitizer signal at the first selected frequency from the digitizer to the pointing device and, in response, generating a pointing device resonant signal;
(d) generating a supply voltage from the pointing device resonant signal; and
(e) generating a pointing device clock signal from the pointing device resonant signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification