| 摘要 |
An optical recording medium comprising a first substrate having a first pit in one surface, a first reflective layer formed on the surface of the first substrate having the first pit to reflect the protrusions/recesses of the first pit, a second substrate formed on the first reflective layer and having a second pit in the surface opposite to the first reflective layer, a second reflective layer formed on the surface of the second substrate having the second pit to reflect the protrusions/recesses of the second pit, and a cover layer formed on the second reflective layer. First pit depth d1, i.e. the difference between protrusions and recesses of the first reflective layer, wavelength lambda of a laser light for signal reproduction, and refractive index n1 of the second substrate satisfy the following relations; lambda/(5n1)<=d1<= lambda/(3n1), and d1lambda/(4n1). Second pit depth d2, i.e. the difference between protrusions and recesses of the second reflective layer, wavelength lambda of the laser light for signal reproduction, and refractive index n2 of the cover layer satisfy the following relations; lambda/(5n2) <=d2<=lambda/(3n2), and d2 lambda/(4n2).
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