| 摘要 |
PURPOSE:To provide an information recording medium which has both visual and mechanical authenticity deciding functions and its manufacturing method. CONSTITUTION:This information recording medium has such a feature that an area where a 1st light diffraction structure 41 enabling a mechanical read of recorded information is formed, and an area where a 2nd light diffraction structure 42 enabling a visual read of recorded information, do not overlap with each other, and its manufacturing method is also provided. Since white turbidity due to an overlap of the 1st light diffraction structure 41 and 2nd light diffraction structure 42 is not generated, malfunction at the time of the read by a machine is hardly caused, an accurate authenticity decision can be made, and a beautiful image can be read even visually. |
