| 摘要 |
The present invention provides an optical recording medium in which two or more information-recording layers are laminated for obtaining a high recording density, and also incidence of light and detection of return light can be performed with high efficiency relating to an information-recording layer at a position distant from a light-incident side, thus having satisfactory recording and reproduction characteristics; and also provides an optical recording and reproducing method for performing at least recording or reproduction of information using this optical recording medium. <??>The optical recording medium 10 includes a plurality of information-recording layers 21, 22 between one principal plane on which light can be incident and the other principal plane on the side opposite to this one principal plane, of which a first information-recording layer 21 nearest to the other principal plane is made to be a phase-modulation type information-recording layer and the other information-recording layer 22 is made to be a reflectance-modulation type information-recording layer. In this optical recording medium 10, recording or reproduction of information relating to the first information-recording layer 21 is performed by phase-modulation method and recording or reproduction of information relating to the other information-recording layer 22 is performed by reflectance-modulation method. <IMAGE> |
