| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical disk which reduces reflectance and reduces angle dependence of reflectance on an incidence surface of a laser beam. <P>SOLUTION: The optical disk 1 has a structure wherein a first substrate 5, a reflection layer 7, a recording layer 9 for hologram recording and a second substrate 11 transmitting the laser beam L for recording and reproduction are stacked. The laser beam L is transmitted through the second substrate 11 and the recording layer 9 is irradiated with the laser beam L. A rugged surface 15 having a structure wherein bottom parts and top parts are alternately disposed in each fixed pitch is formed on the upper surface 13 of the second substrate 11. The reflectance of the laser beam L is reduced and the angle dependency of the reflectance is reduced by the rugged surface 15. <P>COPYRIGHT: (C)2004,JPO |
