Positioning indicating module and stylus pen

An electrostatic stylus pen comprising:

• a variable capacitance capacitor having:
• a first electrode;
• a second electrode formed of a conductive elastic member;
• and
• a dielectric separating the first electrode and the second electrode, the dielectric having a first surface and a second surface opposed to the first surface, the first electrode being disposed on the first surface of the dielectric, the second electrode being disposed so as to face the second surface of the dielectric, wherein, in response to application of pressure to the variable capacitance capacitor, an area of contact of the second electrode with the second surface is changed to vary a capacitance of the variable capacitance capacitor, and in the absence of application of pressure to the variable capacitance capacitor the second surface of the dielectric and the second electrode are separated from each other by a small interval;
• an elongated core body having a tip and a proximal end opposite from the tip, and the elongated core body including a third electrode, wherein, in operation, pressure applied to the tip of the elongated core body is transmitted, via the proximal end, to the variable capacitance capacitor, varying the capacitance of the variable capacitance capacitor;
• a first terminal electrically connected to the first electrode;
• a second terminal electrically connected to the second electrode;
• a third terminal;
• a core body holder supporting a conductive spring and configured to electrically connect the third electrode, via the conductive spring, to the third terminal, wherein the core body holder is configured to removably receive the proximal end of the elongated core body;
• and
• circuitry coupled to the first, second and third electrodes, wherein the circuitry, in operation, converts a capacitance of the variable capacitor into a signal indicative of a pen pressure and generates a transmission signal transmitted from the third electrode.