| 摘要 |
PURPOSE:To realize a method and a medium suitable for high-density recording by laminating one or two more recording medium layers each composed of a reflecting film, light-absorbing film and magnetic film on a nonmagnetic supporting body and making the rays of light having two or more different wavelengths incident on one point simultaneously to attain the recording and reproducing. CONSTITUTION:First and second recording medium layers 1, 2, respectively, each composed of the reflecting film, the light-absorbing film and the magnetic film are laminated on the nonmagnetic supporting body 9. When a magnetic field is applied on the mgneto-optical recording medium of this two-layer structure while the medium is irradiated with a beam of wavelength (lambda1+lambda2), the light of wavelength lambda1 is absorbed by the light-absorbing film 22 of the second recording medium layer 2, by which the magnetic film 23 is heated and signals are recorded in the magnetic film 23 with the light of wavelength lambda2. On the other hand, when a magnetic field is applied while the medium is irradiated with light beams of wavelength (lambda3+lambda4), both beams transmit through the recording medium layer 2 and reach the first recording medium layer 1, by which signals are recorded in the magnetic film 13. Therefore, by collecting the rays of light of four wavelengths, recording can be carried out for both of the first and second recording medium layers simultaneously. |
