INFORMATION WRITABLE MEDIUM AND ITS WRITING METHOD

摘要

PROBLEM TO BE SOLVED: To write personal information after manufacture so that the information is not erased or rewritten by rubbing. SOLUTION: This medium is equipped with a medium base material 11, a transparent or translucent surface protection layer 12 which is formed on the surface of the medium base material 11, and an information write layer 13 which is formed partially or entirely between the medium base material 11 and surface protection layer 12 and can have information written with heat energy; and information 13a is written to the information write layer with a laser beam 31.