| 摘要 |
An optical disk which operates which two of more different wavelengths, comprising a disk substrate on which tracks are formed at a track pitch of not more than 0.5 mum corresponding to light with a short wavelength, a super-resolution film whose transmittance changes due to irradiation of light, and a recording layer, wherein the transmittance of the super-resolution film changes due to the irradiation of light with a long wavelength. In this optical disk, information recorded by light with a short wavelength can be reproduced by light with a long wavelength.
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