| 摘要 |
Disclosed are an information signal recording medium having pits which are formed in a geometric concave or convex configuration for recording information signals and on which a light spot is applied for reproduction of the information signals, a recording apparatus for optically recording the information signals thereon and a reproducing apparatus for optically reproducing the information signals therefrom. In the information signal recording medium, a pit width of a first pit having a pit length substantially equal to half the longest recording wavelength is set to a first pit width smaller than the diameter of the light spot, a pit width of a second pit having a pit length substantially equal of half the shortest recording wavelength is set to a second pit width greater in dimension than the first pit width, and a pit width of a third pit having a pit length in-between the pit length substantially equal to half the longest recording wavelength and the pit length substantially equal to half the shortest recording wavelength is set to be equal to a pit width of a fourth pit having a pit length shorter than the pit length of the third pit or set to be smaller than the pit width of the fourth pit.
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