Reversible thermochromic optical disc

摘要

The present invention provides a reversible thermochromic optical disc capable of forming a pattern thereon by an optical pick-up unit of an optical disc drive. The reversible thermochromic optical disc includes a substrate and a reversible thermochromic dyestuff. The substrate has a label surface. The reversible thermochromic dyestuff coated on the label surface has a hysteresis characteristic upon change of a temperature, and changes between a colored state and a decolored state, wherein the color of the reversible thermochromic dyestuff responds to heat of a laser beam emitted by the optical pick-up unit to form the pattern.