Active stylus ring electrode

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.

An electrode for an active stylus, comprising:

• 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.

An input device comprising:

• 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.