Active stylus having physical writing function

An active stylus having physical writing function, comprising:

• a tip shell including a first opening formed at a cross section of the tip shell and a second opening formed at a bottom of the tip shell, wherein the tip shell includes non-conductive material and wherein a first limit ring is formed on an inner side of the tip shell and close to the first opening and a second limit ring is formed on the inner side of the tip shell and located between the first opening and the second opening;
• and
• a first electrode including a writing electrode and a non-writing electrode, wherein a first end of the writing electrode protrudes through the first opening of the tip shell and a second end of the writing electrode is received by a receiving cavity of the non-writing electrode and wherein an end of the non-writing electrode which is away from the writing electrode protrudes through the second opening of the tip shell and entered a main body housing of the active stylus, wherein the first electrode includes conductive material;
• wherein the writing electrode is configured to leave colored traces on an object by physical friction caused between the writing electrode and the object;
• and
• wherein the first limit ring is configured to prevent the writing electrode from detaching.