OPTICAL RECORDING ELEMENT AND METHOD AND APPARATUS FOR OPTICAL WRITING

摘要

PURPOSE: To maintain excellent CNR and to improve sensitivity by providing the total reflectivity of a recording element with a value close to a second reflectivity maximum value Rmax and positioned between a first reflectivity minimum value Rmin and the Rmax in a reflectivity-to-thickness curve. CONSTITUTION: A data bit is recorded in an area corresponding to a groove 14 or a land 16 between the grooves. Depending on which area is to be used (the base or the land), the thickness of the absorption layer 18 of a dye-binder is selected so as to make the thickness of the layer in the area for recording the pit generally correspond to a point approximated to the second reflectivity maximum Rmax in the curve of the reflectivity to the thickness. For instance, when the pit is to be written in the land 16, the thickness of the absorption layer 18 in the area above the land is selected so as to be approximated to the Rmax.