Patent ID: 8081545

Claim:
An optical disk image forming device for forming a visible image on an optical disk which includes a layer of a coloring matter and in which an image forming area where a track is not formed is set, the optical disk image forming device comprising: a rotating unit that rotates the optical disk at a constant angular velocity; a laser applying unit that applies a laser beam of a constant laser power strength to the optical disk rotated at the constant angular velocity to form the visible image on the image forming area, to thereby lower the strength of the laser beam applied in a unit area of the optical disk more at the outer periphery of the optical disk; and a laser power setting unit that sets the constant laser power strength of the laser beam applied by the laser applying unit to a value by which discoloration of the coloring matter is saturated at an outermost peripheral position of the image forming area when the visible image is formed in the image forming area, the saturation completely discoloring the coloring matter, wherein the visible image is formed on a peripheral position different from the outermost peripheral position the image forming area of the optical disk at the constant laser power strength which is set by the laser power setting unit.