Patent ID: 7948861

Claim:
An optical disk comprising: a data recording layer configured to record data; and a figure writing layer configured to write a visible figure; wherein the figure writing layer includes a reflective layer and a plurality of other layers; wherein the data recording layer and the figure writing layer are affixed to each other via a spacer layer; wherein the plurality of other layers comprises films configured to undergo a phase change between a crystal state and an amorphous state by way of energy irradiation; wherein user data is recorded in the data recording layer, or a visible figure is written in the figure writing layer, by optical irradiation; wherein each of the films configured to undergo a phase change between a crystal state and an amorphous state produces an atomic arrangement change at a different temperature; and wherein of the films configured to undergo a phase change between a crystal state and an amorphous state, those that are closer to the light incident side produce an atomic arrangement change at lower temperatures.