| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical information recording medium which is added with visibly recognizable information by recorded ruggedness without disturbing the shapes of pits which are regenerative signals with an optical disk recorded with the information. SOLUTION: Fine grooves 4 are formed in land parts between the adjacent information pits 3 in regions 1 of visible image patterns. Also, the grooves are not formed in regions 2 off the visible patterns. Since differences are produced in the diffraction effects of light by the presence or absence of the grooves 4 between these land parts, the formation of the visibly recognizably patterns in the information recording regions is made possible. |
