| 摘要 |
An optical disk comprising a substrate, a reflecting layer, an organic pigment layer, a protective layer, and a cover layer. The hardness of the resin substrate side of the optical disk is set to be larger than the hardness of the cover layer side where a later beam transmits. The stress caused by the heat generation and expansion of the organic pigment when recording information is diffused to the cover layer side. The relationship of the hardness of both sides needs to satisfy the aforementioned relationship when recording information. This optical disk suited for the in-groove recording method can prevent deformation of a reflecting film when recording information and record more detailed information. <IMAGE> |
