| abstract |
OPTICAL RECORDING MEDIUM CHARACTERIZED IN THAT IT INCLUDES A SUBSTRATE 12 HAVING A MAIN SURFACE 14 PROVIDED WITH A PLURALITY OF INDENTATIONS 32, AND AN ABSORBENT LAYER 36 OVERCOMING THE MAIN SURFACE 14 AND FILLING SAID INDENTATIONS 32; THIS LIGHT ABSORBING LAYER AT THE WAVELENGTH OF A LIGHT BEAM FOR RECORDING AND READING, IN ORDER TO FORM FIRST AND SECOND REGIONS IN THE RECORDING MEDIUM, SUCH AS THE SENSITIVITY TO THE RECORDING , IN THE FIRST REGIONS, IS GREATER THAN THE SENSITIVITY TO REGISTRATION OF SAID MIDDLE IN THE SECOND REGIONS. |