Untethered stylus employing separate communication and power channels
First Claim
1. An untethered stylus configured to cooperate with a location sensor, the location sensor configured to generate a magnetic field comprising a plurality of frequencies and communicatively couple to the stylus, the stylus comprising:
- a housing comprising a tip and a shield;
circuitry provided in the housing and comprising a power circuit; and
an antenna arrangement comprising;
a plurality of coil resonant circuits each tuned to a different frequency of the magnetic field and each coupled to the stylus tip;
a first coil resonant circuit of the plurality of coil resonant circuits coupled to the power circuit and configured to energize the power circuit in response to the magnetic field, the power circuit configured to provide DC power to the circuitry when energized; and
one or more other coil resonant circuits of the plurality of coil resonant circuits coupled between the tip and shield of the housing to define separate channels for communicatively coupling the stylus tip and the location sensor, wherein an information signal communicated between the stylus tip and the location sensor is substantially unperturbed during provision of DC power by the first coil resonant circuit.
1 Assignment
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Accused Products
Abstract
An untethered stylus is configured to cooperate with a location sensor that generates a magnetic field. The stylus include a housing having a tip and a shield. Circuitry, including a power circuit, is provided in the housing. An antenna arrangement provided at the housing includes multiple coil resonant circuits each tuned to a different frequency of the magnetic field. A first coil resonant circuit energizes the power circuit in response to the magnetic field, which provides DC power to the circuitry. One or more other coil resonant circuits are coupled between the tip and shield of the housing to define separate channels for communicatively coupling the stylus tip and the location sensor. An information signal communicated between the stylus tip and the location sensor is substantially unperturbed during provision of DC power by the first coil resonant circuit.
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Citations
22 Claims
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1. An untethered stylus configured to cooperate with a location sensor, the location sensor configured to generate a magnetic field comprising a plurality of frequencies and communicatively couple to the stylus, the stylus comprising:
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a housing comprising a tip and a shield; circuitry provided in the housing and comprising a power circuit; and an antenna arrangement comprising; a plurality of coil resonant circuits each tuned to a different frequency of the magnetic field and each coupled to the stylus tip; a first coil resonant circuit of the plurality of coil resonant circuits coupled to the power circuit and configured to energize the power circuit in response to the magnetic field, the power circuit configured to provide DC power to the circuitry when energized; and one or more other coil resonant circuits of the plurality of coil resonant circuits coupled between the tip and shield of the housing to define separate channels for communicatively coupling the stylus tip and the location sensor, wherein an information signal communicated between the stylus tip and the location sensor is substantially unperturbed during provision of DC power by the first coil resonant circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method implemented in an untethered stylus for use with a location sensor configured to generate a magnetic drive signal comprising a plurality of frequencies, the stylus comprising a stylus tip, and the method comprising:
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receiving the magnetic drive signal at the stylus; generating an AC voltage by each of a plurality of coil resonant circuits of the stylus in response to the magnetic drive signal, each of the plurality of coil resonant circuits tuned to a different frequency of the magnetic drive signal and coupled to the stylus tip; converting the AC voltage of a first coil resonant circuit of the plurality of coil resonant circuits to a DC voltage for powering circuitry of the stylus; and generating one or more channels for effecting communication between the stylus and the location sensor using one or more of the plurality of coil resonant circuits other than the first coil resonant circuit. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification