| 摘要 |
PROBLEM TO BE SOLVED: To enable reading-out accurate information signal while executing coloring which can be discriminated from other optical disks by visual observation to a specific optical disk. SOLUTION: In an optical disk 1 in which a signal recording part 5 is provided on one side of a substrate 2 made of a synthetic resin, the other side is irradiated with optical beams and information is read-out by detecting the optical beams reflected from the signal recording part 5, a colored layer 9 made of a colorant, in which a triphenylmethane series blue dye is dispersed and dissolved in an UV curing type resin, is provided at a surface side of the substrate 2 on which optical beams are made incident and >=60% of the optical beams of 630 to 800 nm wavelength made incident on a signal recording part 6 are reflected. |
