| CPC G06F 3/03545 (2013.01) [G06F 3/038 (2013.01)] | 14 Claims |
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1. An input device comprising:
a housing;
a tip electrode protruding outside of the housing and configured to transmit a downlink signal to the outside;
a reception electrode inside the housing and configured to receive an uplink signal from the outside; and
a communication circuit electrically connected to the tip electrode and the reception electrode and configured to receive the uplink signal from the reception electrode or to transmit the downlink signal to the tip electrode,
wherein a surface of the reception electrode has a concave-convex structure,
the reception electrode includes a plurality of reception protrusions spaced apart from each other,
the reception protrusions has one shape of a hemisphere, a cylinder column, or a polygonal column.
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