Touch stylus capable of detecting pressure on a tip and related optical-mechanical system

An optical-mechanical system utilizing a touch stylus to detect pressure on its tip, the optical-mechanical system comprising:

• a panel;
• at least one optical detector disposed on a corner of the panel, and
• a touch stylus for painting a line on the panel, the optical detector detecting parameters generated by the touch stylus to display a pattern on the panel, the pattern corresponding to a track of the line and the pressure on its tip, the touch stylus comprising:
• a body;
• a tip movably disposed on an end of the body;
• and
• a pressure sensing module disposed between the body and the tip for detecting the pressure on the tip, the pressure sensing module comprising:
• a lighting unit;
• a pressure sensing unit connected to the tip and comprising a signal emitter, a signal receiver and a retractable isolation structure, a press-based signal generated from the signal emitter being transmitted through the retractable isolation structure to be received by the signal receiver in a direction substantially parallel to a retracting direction of the retractable isolation structure, and a value of a movement between the tip and the body being acquired according to time difference between receiving the press-based signal by the signal receiver and outputting the press-based signal by the signal emitter, so as to generate a corresponding electrical signal;
• and
• a controller electrically connected to the lighting unit and the pressure sensing unit for receiving the electrical signal, so as to drive the lighting unit to generate a corresponding optical signal, a scintillating frequency of the optical signal and a value of the electrical signal being in direct proportion, and the controller being adapted to activate the lighting unit by the electrical signal varied with the compressed variation of the retractable isolation structure since the pressure sensing unit detects the movement of the tip and further to accordingly increase the scintillating frequency since the movement is increased;
• wherein the optical detector receives the optical signal, and transforms the scintillating frequency of the optical signal into the pressure on the tip.