Optischer Datenaufzeichnungsträger sowie zugehöriges Aufzeichnungs- und Wiedergabeverfahren

摘要

An optical information recording medium according to the present invention has a thin film material (3) formed on a substrate (1), the optical constant of which film material (3) is changed with application of a light beam so that the optical phase of reflected or transmitted light of incident light is changed between before and after the change of the optical constant, thereby reproducing signal by detecting a change in the overall quantity of the reflected or transmitted light due to this optical phase change. It is preferable that the optical information recording medium has a structure which causes no change or a small change in the amplitude of the reflected or transmitted light between before and after that change. It is also possible to perform the signal reproduction equivalent to concave/convex pits without being accompanied with deformation, thereby improving the recording density. It is easy to make interchange with optical recording medium of write once type and read only type and, furthermore, it is possible to erase and rewrite.