PURPOSE: To perform a personal printing with a simple structure by forming a latent image by a pen having a heater and a liquid supply unit therein.
CONSTITUTION: Liquid L is filled in a cylindrical resin outer cylinder 10A, an inner cylinder 10B having an external heater 13 is charged therein, and a ball 12 is provided at an end of the cylinder 10B to constitute a pen 10. The pin 10 is used similarly to a writing ball-point pen to write from a recording layer 18B side coated with recording material of a recording medium 18 by the ball 12. Thus, the liquid L in the cylinder 10B flows out by the rotation of the ball 12. In this case, the liquid is heated by the heater 13, and hence the ball 12 moving part of the layer 13B of the medium 18 is heated in contact with the liquid L to vary a backward contact angle with the liquid L, thereby forming a visible image.
KATANO YASUO
TOMONO HIDENORI
SATO MASATOSHI
