Pen-shaped coordinate indicator

A method of detecting a pressing force applied to a pen tip of a pen-shaped coordinate indicator, comprising:

• providing the pen-shaped coordinate indicator including:
• a core body that projects from a distal end of a chassis to form a pen tip;
• a columnar first magnetic body having a distal end surface and a proximal end surface, the distal end surface being in contact with the core body;
• a columnar second magnetic body having a distal end surface opposed to the proximal end surface of the first magnetic body;
• a coil wound around at least one of the first and second magnetic bodies;
• a capacitor connected to the coil;
• and an elastic body provided between the proximal end surface of the first magnetic body and the distal end surface of the second magnetic body, the elastic body being composed of a main body part and one or more projections extending outwardly from an external surface of the main body part, the main body part and the one or more projections being formed of the same material and forming a continuous structure, and the one or more projections contacting at least one of the proximal end surface of the first magnetic body and the distal end surface of the second magnetic body;
• when the pressing force is not applied to the pen tip, having the main body part and the one or more projections position the first magnetic body and the second magnetic body to be separated from each other;
• and
• when the pressing force is applied to the pen tip, initially having the one or more projections mainly deformed, and thereafter having the main body part mainly deformed to thereby change a distance between the first magnetic body and the second magnetic body according to the pressing force applied to the pen tip.