Heated writing device for use with thermochromatic ink

A thermochromatic drawing system, comprising:

• a work surface configured to provide a support for a substrate, wherein the substrate is treated with a thermochromatic ink;
• and
• a device for activating thermochromatic ink, the device comprising:
• a drawing tip comprising a conductive body having a cylindrical portion, a substantially conical portion, a substantially rounded point, and a cavity, wherein the cavity is arranged at least partially within the cylindrical portion, the rounded point is at an end of the conical portion;
• a heating element arranged within the cavity, the heating element comprising a positive temperature coefficient (PTC) heating element, the heating element communicably coupled to the drawing tip and configured to connect to a power source to heat the drawing tip;
• and
• a coiled spring and spring holder, the coiled spring held within the cavity between the heating element and the spring holder, the spring and spring holder providing a retention force to hold the heating element against the drawing tip.

A device for activating thermochromatic ink, the device comprising:

• a drawing tip comprising a conductive body including a substantially cylindrical portion, a substantially conical portion, a substantially rounded point, and a cavity, wherein the cavity is arranged within the cylindrical portion, the conical portion, or both, and the rounded point is at an end of the conical portion;
• a heating element arranged within the cavity, the heating element communicably coupled to the drawing tip and configured to connect to a power source to heat the drawing tip;
• and
• a coiled spring and spring holder, the spring held within the cavity between the heating element and the spring holder, the coiled spring and spring holder providing a retention force to hold the heating element against the drawing tip.