OPTICAL RECORDING SYSTEM.

摘要

Systems and method for optically recording data. One system comprises a disc (100) comprising a substrate (220) and a markable coating on said substrate, the markable coating having a thickness less than (1). mum and comprising: a matrix (250); and a color-forming agent included in the matrix and comprising a leuco dye and developer; wherein the leuco dye is selected to change from high reflectance of radiation with wavelengths between 400 and 500 nm to low reflectance of radiation with wavelengths between 400 and 500 nm when activated by the application of energy above a threshold level; and a marking light source (150) positioned so as to illuminate the disc in a desired manner.