Recording material for storage of digital information and a recording method for storage of digital information.

摘要

Recording material suitable for use in laser beam recording characterized in that said material as illustrated in Fig. 1 comprises on the same side of a laser radiation-reflective support, including a support with laser radiation reflecting layer, two superimposed adjacent recording layers which can undergo on exposure instantly produced optical density changes responsive to irradiation with laser beams of different wavelength, the compositions of said layers being such that they have different radiation-sensitive characteristics permitting information-wise recording to take place in one layer without changing the optical density of the other layerto such a degree that laser beam read out of optical density information in one layer becomes impossible upon using laser beams of different wavelength for each recording layer.