| 摘要 |
PURPOSE:To acquire a high modulation factor with a high reflection factor by irradiating the recording layer of an optical recording medium with light, recording information while changing the diffraction factor of the recording layer and reproducing the information by detecting the intensity of the light based on interference using phase difference to be generated by the change in the diffraction factor of the recording layer. CONSTITUTION:A disk D is composed of a transparent substrate 1, recording layer 2, reflecting film 3 and protecting film 4. The information are recorded by irradiating the recording layer 2 of the optical recording medium with the light and changing the diffraction factor of the recording layer 2. At the time of reproducing, the information are reproduced by detecting the intensity of the light based on the interference using the phase difference to be generated by the change in the diffraction factor of the recording layer 2 to be generated between light to pass the recording layer 2 and light not to pass the recording layer when the optical recording medium is irradiated with the light. Thus, the medium with low absorption factor, namely, with the high reflection factor can be utilized and further, since the phase difference is utilized, the high modulation factor can be acquired. |
