Stylus capable of detecting pressure on a tip

A touch stylus capable of detecting pressure on its tip, the touch stylus comprising:

• a holder;
• a tip movably disposed on an end of the holder;
• and
• a pressure sensing module disposed between the holder and the tip for sensing the pressure on the tip, the pressure sensing module comprising:
• a retractable body disposed inside the holder and connected to the tip, the retractable body comprising:
• a base, comprising a first end portion, a second end portion and a resilient tubular portion, two ends of the resilient tubular portion being integrally sealed by the first end portion and the second end portion;
• a reference component undetachably fixed to the first end portion of the base and fixed inside the holder;
• and
• a movable component undetachably fixed to the second end portion of the base and connected to the tip, an interval between the reference component and the movable component being inversely proportionally varied by elastic deformation of the resilient tubular portion;
• and
• a sensor comprising an emitter and a receiver respectively disposed on the reference component and the movable component, the base being a chamber disposed on a signal transmission path between the emitter and the receiver, and the receiver receiving a signal emitted from the emitter and only passing through the resilient tubular portion, and detecting a movement of the movable component relative to the reference component based on a time transmission difference of the signal, so as to transform the movement into the pressure accordingly.