| 摘要 |
An optical recording medium is provided, this medium having a first substrate, onto the surface of which is formed a phase-change recording layer, and a second substrate, onto the surface of which is formed a magneto-optical recording layer, these layers being adhered to one another in a manner that causes their surface to be mutually opposing. By providing a means for selectively collecting laser light onto the phase-change recording layer and onto the magneto-optical recording layer, and selecting the output of either a differential amplifier or amplifier, to which are input the received-light outputs from light reflected from the optical recording medium, it is possible to perform access of both the phase-change recording layer and the magneto-optical recording layer, and to perform both recording and playbacking of information at high speed. |
