| 摘要 |
PROBLEM TO BE SOLVED: To produce an optical recording medium suitable for discrimination, control, etc. SOLUTION: A writing beam is emitted by a pickup 28 to a recording layer formed in the optical recording medium DSC, causing a change in the optical characteristics in the irradiated and unirradiated parts of the beam in the recording layer, and thereby forming in the medium DSC a visible image pattern suitable for discrimination, control, etc. |
