| 摘要 |
PURPOSE: To obtain an optical information recording medium, reproduction of which is possible with a reproducing device for both of SDs and HDMCDs or a reproducing device for both of SDs and CDs, by providing this recording medium with a translucent film and reflection film corresponding to first and second transparent substrate, respectively. CONSTITUTION: The first transparent substrate 1 has a first information surface 2 having a smooth surface and pits corresponding to first recording information. This first information surface 2 is coated with the translucent film 5 to pass a part of a reproducing beam and to reflect a part thereof. The second transparent substrate 3 has a second information surface 4. This second information surface 4 is coated with the reflection film 6 for reflecting a greater part of the reproducing beam. The optical information recording medium is formed by sticking or superposing the first transparent substrate 1 and the second transparent substrate 3. Thereby, the distance between the first information surface 2 and the second information surface 4 and the thickness of the second transparent substrate 3 are increased, out-of-focus-servo is prevented, and the reproduction of the information at a high SN is made possible. |
