Disclosed in this invention is a recording medium characterized by forming on the support a recording layer containing a metastable sensitive substance which is an intermediate product of a reaction between a first colorless or light-colored material containing the S atoms released by light irradiation and a second colorless or light-colored material which develops color as it is sulfurized by said S atoms.
A light information recording medium useful for light disc memories is described, comprising a support and a recording layer formed thereon containing a mixture of a metal with at least one of Ga.sub.2 S.sub.3 and MoO.sub.3.
An optical recording medium made up of a substrate and an electromagnetic radiation sensitive layer consisting essentially of a sulfur compound as a matrix and a substance (such as, for example, Te, Pb, Au, Sn, As, Bi, In, C) which is subjected to heat action from absorption of electromagnetic radiation and brings about optical changes by such heat action.
This invention, related to an optical information recording medium for recording, reproducing and erasing information by causing changes in the optical constant by using light, heat or other means, is intended to propose a recording film material of a novel composition in order to realize higher transfer rate of signals. Specifically, it is an alloy composed of indium (In) and A and B (A is at least one element selected from Ag, Cu, and B is at least one element selected from S, Se, Te), and more particularly it is composed in the vicinity of the stoichiometric compound of the above three-element system. Since the recording film material of this invention is fast in the rate of crystallization, it is possible to present an optical information recording medium that can cope with the forthcoming trend of higher transfer rate of signals.
Substrates suitable for being marked by light energy from a laser are disclosed. Such substrates include a base substrate component and a filler pigment component coupled to the base substrate component and including a combined metal component and a glass forming component other than the combined metal component. The filler pigment component is present in an amount effective to, as a result of exposing the substrate to light energy from a laser, produce a colored glass-like pigment component coupled to the base substrate component having a contrasting color relative to the filler pigment component. Markings, for example, on electrical wire insulation, having higher contrast and greater durability are advantageously provided.
This invention provides an optical recording material comprising a base and a thin film formed on the base and composed of oxides which are represented by the formula (V.sub.2 O.sub.5).sub.1-x. (M.sub.y O.sub.z).sub.x wherein M.sub.y O.sub.z is at least one of metal oxides, metalloid oxides and non-metal oxides, and 0.ltoreq.x<1 and which have an amorphous or layer structure and a process for preparing an optical recording material, the process comprising the steps of applying to a base a solution, sol solution or gel solution of amorphous oxides represented by the formula (V.sub.2 O.sub.5).sub.1-x.(M.sub.y O.sub.z).sub.x wherein M.sub.y O.sub.z is at least one of metal oxides, metalloid oxides and nonmetal oxides, and 0.ltoreq.x<1, and evaporating off the solvent.
