PHOTOTHERMAL CONVERSION TYPE RECORDING MEDIUM

摘要

PURPOSE:To convert light to thermal energy by effectively absorbing said light and to enable high density recording and optical reproduction, by containing a specific azulenium salt compound. CONSTITUTION:A photothermal conversion type recording medium is obtained by forming a thin film 2 containing an azulenium salt compound to a substrate. The thin film 2 is formed by the vacuum vapor deposition of the azulenium salt compound represented by general formula [I] or coating a solution prepared by dissolving said compound in a solvent. The content of the azulenium salt compound is 0.1-99wt% in the thin film 2 and the thickness of said from 2 is set to 10mum or less. A pit 5 is formed by irradiating or contacting the thin film 2 with electromagnetic radiation 4. The scanning of low output laser is applied to the pit formed part and a pit non-formed part along a track and the reflectivity difference thereof is read by a photodetector.