INFORMATION RECORDING MEDIUM

摘要

In an optical information recording medium, a protective layer containing a material not reacting with an active layer is disposed, and the composition ratio of this protective layer is designed so as to increase the amount of the material not reacting with the active layer near the border contacting with the active layer, so that degradation of the active layer is prevented. In this construction, the stability is maintained after repetition of recording and erasing cycles over 1 million times.