Thermo-optical data writing process and data medium for performing this process
AssigneeThomson-CSF
InventorJean Cornet
Life of this patent
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Abstract
A thermo-optic data writing process and record in which focussed radiation is directed onto a data medium made up of a substrate, an organic layer directly deposited thereon with the interface therebetween being non-reflective and, on the organic layer, a metal layer of an alloy of metals selected to provide desired adhesion, range of deformation and shock resistance to rupture, for example, incorporating gold, silver or copper. Gas evolution by local degradation of the organic layer produces a bubble in the metal.
Claims20
A thermo-optical data writing process consisting of the surface heating by means of an intensity-modulated, focused radiation beam of a thermosensitive data medium having a first metal layer of ductile material covering an organic intermediate layer, and separated therefrom by an intermediate metal layer wherein the thermal energy given off in the metal layers by the impact of the beam causes gas evolution by local degradation of the organic intermediate layer, this gas evolution and the loss of adhesion associated therewith lead to stretching in the metal layers beyond the elastic limit and less than the elongation required to break the ductile material constituting said metal layers, and the first metal layer is an alloy of metals selected to provide desired adhesion, range of deformation and shock resistance to rupture.
A data medium for thermo-optical recording of information comprising an organic intermediate layer covered by a first metal layer of ductile material and of an alloy of metals selected to provide desired adhesion, range of deformation and shock resistance to rupture, and separated therefrom by an intermediate metal layer wherein the localized heating of the metal layer in the impact area of a focused radiation beam produces a gas evolution by local degradation of the organic intermediate layer, this gas evolution and loss of adhesion resulting therefrom bringing about a plastic stretching of the metal layer which is beyond the elastic limit and less than the elongation required to break the ductile material constituting the metal layer.
An information support for thermo-optical recording of information comprising a substrate, an organic layer deposited directly on said substrate so that the interface therebetween is non-reflective, a first metal layer covering said organic layer and an intermediate metal layer between said first layer and said organic layer.
Dependencies are inferred from the claim text.