Active stylus ring electrode
First Claim
1. An apparatus comprising:
- a base formed of a non-conductive material;
a ring electrode formed of a conductive material and encircling the base;
a ground ring formed of the conductive material and encircling the base and separated from the ring electrode by a first distance; and
a ground plate formed of a second conductive material and separated from the ring electrode by a second distance;
wherein the ring electrode is connected to a drive circuitry, the ground ring is connected to a reference potential, and the ground plate is connected to the reference potential.
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Accused Products
Abstract
A ring electrode to determine the orientation of the stylus relative to the surface. The stylus can include a ring electrode configuration which can improve capacitive coupling between the ring electrode and the touch panel. The ring electrode configuration can include a ring electrode and ground ring, and ground plate. By varying the lengths of ring electrode, ground ring, ground plate, and the distance between these elements, the electric field emanating from the ring electrode can be tuned to optimize the capacitive coupling between the ring electrode and surface. In some examples, the ring electrode can include multiple sub-rings. In some examples, the ring electrode can comprise a crown shape including projections, each having a width that tapers to a minimum width along the length of the ring electrode.
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Citations
25 Claims
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1. An apparatus comprising:
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a base formed of a non-conductive material; a ring electrode formed of a conductive material and encircling the base; a ground ring formed of the conductive material and encircling the base and separated from the ring electrode by a first distance; and a ground plate formed of a second conductive material and separated from the ring electrode by a second distance; wherein the ring electrode is connected to a drive circuitry, the ground ring is connected to a reference potential, and the ground plate is connected to the reference potential. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An electrode for an active stylus, comprising:
a plurality of hollow cylindrical sub-rings positioned parallel to one another along a length of the electrode; wherein each of the sub-rings is separated from adjacent sub-rings in a first direction by a respective separation distance and wherein each of the sub-rings is electrically connected to one or more of the adjacent sub-rings via one or more conductive traces disposed between the adjacent sub-rings such that each of the sub-rings of the electrode are at a same electrical potential; and wherein a respective length of each sub-ring increases with each of the hollow cylindrical sub-ring along the length of the electrode in the first direction. - View Dependent Claims (16, 17, 18, 19, 20)
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21. An electrode for an active stylus, comprising:
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a hollow cylindrical ring portion; a plurality of projections forming a crown shape; wherein each of the plurality of projections originates at the hollow cylindrical ring portion and extends from the hollow cylindrical ring portion along a length of the electrode toward a first end, and wherein each of the plurality of projections has a maximum width at the hollow cylindrical ring portion which tapers to a minimum width at the first end of the electrode. - View Dependent Claims (22, 23, 24)
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25. An input device comprising:
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a body including a shaft portion and a tip portion; a tip electrode at a distal end of the input device and disposed in the tip portion; a ring electrode apparatus disposed in the tip portion distal to the tip electrode, wherein the ring electrode apparatus includes; a base formed of a non-conductive material; a ring electrode formed of a conductive material and encircling the base; a ground ring formed of the conductive material and encircling the base and separated from the ring electrode by a first distance; a ground plate formed of a second conductive material and separated from the ring electrode by a second distance; stimulation circuitry coupled to the ring electrode and configured to generate one or more stimulation signals.
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Specification