| 摘要 |
An optical disk includes: an information recording surface; first surface-transformed portion array formed on the information recording surface and including first surface-transformed portions transformed in shapes, the first surface-transformed portion reflecting a laser light, when it is irradiated thereon, polarized in accordance with the transformed shape thereof so that major axis of the polarized light is oriented to a first direction; and second surface-transformed portion array formed on the information recording surface and including second surface-transformed portions transformed in shapes, the second surface-transformed portion reflecting a laser light, when it is irradiated thereon, polarized in accordance with the transformed shape thereof so that major axis of the polarized light is oriented to a second direction. The first surface-transformed portion array and the second surface-transformed portion array are formed alternately in a radial direction of the optical disk, and the first direction and the second direction differ from each other by 45 degrees.
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