| 摘要 |
PURPOSE:To improve initial performance and to improve continuous repetitive reproduction performance and light resistance by using iodine or perchloric acid additive of a squarylium dye as a recording film. CONSTITUTION:The recording film 3 is formed by forming an SiO2 film 2 by sputtering on the tracked surface of a substrate 1 and spin-coating the soln. of the iodine additive of the squarylium dye thereon. The squarylium dye to be used is the compd. expressed by the formula, where R1-R4 are an aryl group or satd. hydrocarbon rings, etc., of 5--7-membered rings in which R1 and R2 or R3 and R4 are combined, R5 and R6 are hydrogen or aryl group, alkyl group, Y denotes the element of group VI. The spectral absorption peak is thereby shifted and the recording and reproducing by a semiconductor laser, etc., are permitted; in addition, the medium is stable to external light and repetitive reproduction. |
