Patent ID: 8147942
Filing Date: 2012-04-03
Classification: G11B,Y10T

Abstract:
1. A write-once-read-many optical recording medium, comprising: a support substrate; and a recording layer and a layer adjacent to the recording layer on the support substrate, the recording layer containing an oxide of one of a metal and a metalloid as a principal component, wherein the recording layer includes a region where a constituent element of the adjacent layer is dispersed, and recording and reproduction are performable with laser light of a blue wavelength region, and wherein the write-once-read-many optical recording medium further comprises: an additional layer adjacent to the recording layer, wherein positions at which a number of atoms of the one of the metal and the metalloid of the oxide is a half of a maximum of the number of atoms in the recording layer in an analysis of a composition of the write-once-read-many optical recording medium in a direction of a film thickness thereof are defined as interfaces between the recording layer and the adjacent layer and the additional adjacent layer, and a ratio of the element of the adjacent layer at a center of the recording layer is more than or equal to 5 at % of elements of the recording layer, the center of the recording layer being determined by the interfaces.