Input system
First Claim
1. A user input system, comprising:
- means for generating an alternating magnetic field;
a user-holdable device comprising a resonant circuit, means for coupling to ground, and a conducting tip, the means for coupling to ground being coupled to a first side of the resonant circuit (34)and the conducting tip being coupled to a second side of the resonant circuit, the resonant circuit being operable to provide an alternating voltage induced from the alternating magnetic field when positioned in the vicinity of the means for generating an alternating magnetic field; and
means for sensing an output provided at the conducting tip due to the alternating voltage source when the conducting tip is in the vicinity of the means for sensing an output.
1 Assignment
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Accused Products
Abstract
A user input system (1), comprising a coil (44) for generating an alternating magnetic field, a cordless pen (9), and a capacitive current measuring arrangement or an electric field sensing arrangement. The cordless pen (9) comprises a resonant circuit (34), a conductive housing (28) and a conducting tip (36). The alternating magnetic field induces an alternating voltage in the resonant circuit (34), which is coupled to the conducting tip (36). The capacitive current measuring arrangement comprises a resistive sheet (40) and current measuring means (42) arranged to measure a capacitive current flowing from the conducting tip (36) to the resistive sheet (40). The electric field sensing arrangement comprises an electric field sensing reception electrode (47) and current sensing circuitry (48) for determining a current excited in the electric field sensing reception electrode (47) by an electric field generated by the conducting tip (36). In each case the currents are sensed at plural locations and the differing magnitudes compared to determine a position of the conducting tip (36) relative to the plural locations. The system may also be adapted to sense a user'"'"'s finger (8). The user input system (1) may be incorporated in a display device, for example an active matrix liquid crystal display device (4).
157 Citations
35 Claims
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1. A user input system, comprising:
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means for generating an alternating magnetic field;
a user-holdable device comprising a resonant circuit, means for coupling to ground, and a conducting tip, the means for coupling to ground being coupled to a first side of the resonant circuit (34)and the conducting tip being coupled to a second side of the resonant circuit, the resonant circuit being operable to provide an alternating voltage induced from the alternating magnetic field when positioned in the vicinity of the means for generating an alternating magnetic field; and
means for sensing an output provided at the conducting tip due to the alternating voltage source when the conducting tip is in the vicinity of the means for sensing an output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A user-holdable device for a user to provide input to a user input system, comprising:
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a resonant circuits;
means for coupling to ground; and
a conducting tip;
the means for coupling to ground being coupled to a first side of the resonant circuit and the conducting tip being coupled to a second side of the resonant circuit, the resonant circuit being operable to provide an alternating voltage induced from an alternating magnetic field. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32)
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33. A method of sensing user input from a user-held devices, comprising:
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generating an alternating magnetic field that passes in to the user-held object;
inducing an alternating voltage in the user-held object from the alternating magnetic field;
providing an output from the alternating voltage at a conducting tip of the user-held device; and
using sensing means to sense the output when the user-held device is positioned or moved such that the conducting tip is in the vicinity of the sensing means. - View Dependent Claims (34, 35)
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Specification