Stylus for a digitizer system
First Claim
Patent Images
1. A stylus comprising:
- a power source configured to power generation of a second signal;
a resonant circuit including a first capacitor and an inductor, the resonant circuit configured to alternate between receiving a first signal on the inductor by wireless communication and generating the second signal;
a controller configured to operate the resonant circuit in a receive mode and to switch operation of the resonant circuit to a transmit mode based on receiving the first signal,wherein during the receive mode, the controller is configured to disconnect the resonant circuit from the power source, to sample output from the resonant circuit and to decode the sampled output, andwherein during the transmit mode, the controller is configured to connect the resonant circuit to the power source by wired connection to generate the second signal.
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Abstract
A signal emitting stylus for operation with a digitizer system includes a resonant circuit including a first capacitor and an inductor, the circuit operative to alternate between receiving a wirelessly transmitted first signal and generating electrical field; a controller and a power source. The controller operates the resonant circuit in a receive mode for receiving the first signal, decodes the received first signal and switches operation of the resonant circuit to a transmit mode for generating the electrical field and coupling the electrical field to a digitizer system in response to detecting the first signal. The power source powers generation of the electrical field.
22 Citations
20 Claims
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1. A stylus comprising:
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a power source configured to power generation of a second signal; a resonant circuit including a first capacitor and an inductor, the resonant circuit configured to alternate between receiving a first signal on the inductor by wireless communication and generating the second signal; a controller configured to operate the resonant circuit in a receive mode and to switch operation of the resonant circuit to a transmit mode based on receiving the first signal, wherein during the receive mode, the controller is configured to disconnect the resonant circuit from the power source, to sample output from the resonant circuit and to decode the sampled output, and wherein during the transmit mode, the controller is configured to connect the resonant circuit to the power source by wired connection to generate the second signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for operating a stylus for operation with a digitizer system, the method comprising:
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providing a resonant circuit in a stylus; providing a power source in the stylus; operating the resonant circuit in a receive mode, wherein the power source is disconnected from the resonant circuit during the receive mode; sampling a first signal that is wirelessly received by the resonant circuit during the receive mode; switching operation of the resonant circuit to a transmit mode; powering the resonant circuit by connecting the resonant circuit to the power source by wired connection; and transmitting a second signal from the stylus during the transmit mode. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification