| 摘要 |
<p>An optical recording medium such as an optical disc memory, with which data can be stored and reproduced by means of laser beam with a high sensibility is disclosed. The optical recording medium comprises: a substrate transparent to the laser beam; a first spacer layer formed on the substrate, being substantially transparent to the laser beam and having a higher refractive index than the substrate with respect to said laser beam; a second spacer layer formed on the first spacer layer, being substantially transparent to the laser beam and having a lower refractive index than the first layer with respect to said laser beam; and a recording layer formed on the second spacer layer and for storing data therein by the radiation of laser beam. The thickness of the first spacer layer is not larger than a thickness at which the first spacer layer, when combined only with the substrate, presents a maximal reflectivity with respect to a laser beam being incident on the substrate and the thickness of the second spacer layer is smaller than a thickness at which the second spacer layer, when combined only with said first spacer layer and the substrate, presents a minimal reflectivity with respect to a laser beam being incident on the substrate .</p> |
