RECORD CARRIER IN WHICH INFORMATION CAN BE WRITTEN AND WHICH CAN BE READ BY OPTICAL MEANS

摘要

12 A record carrier is described for optically writing and reading information, which record carrier is provided with a pre-formed track. This track is formed by a ridge 4' disposed on the surface of a substrate 5 and the recording layer comprises a dye layer 6 having such a thickness at the location of the ridge that a write beam can produce a maximum optical effect therein, the dye layer being thicker at locations 13' outside the ridge.