| 摘要 |
<p>An optical information recording medium is composed of a transparent disc substrate having a pregroove area on its surface, a recording dye layer on which information can be recorded by irradiation with light, and a light-reflecting layer overlaid in order. The recording dye layer is composed of a cyanine dye whose solubility in 2,2,3,3-tetrafluoropropanol is more than 13 wt.% at 25 DEG C, and has a difference of optical density of less than 0.2, said difference being between an optical density measured in a position of 1 mm from an internal boundary of the pregroove area and an optical density measured in a position of one thirds of the width of the pregroove area from the internal boundary of the pregroove area. <IMAGE></p> |
