Optical recording medium with fluorine resin adhesive

DETAILED DESCRIPTION It is therefore an object of the present invention to provide a new and improved optical recording medium with a pre-groove in which a recording layer can be tightly adhered to a substrate without degrading fundamental optical characteristics thereof.
In accordance with the above object, the present invention is addressed to a specific recording medium which includes a resinous substrate with a pre-groove.
The substrate is transparent so as to allow a radiation beam to pass therethrough.
Above the substrate a metallic recording layer is formed which changes its optical characteristic in an area onto which the radiation beam is focused, to thereby store binary data.
A transparent adhesive layer is provided between the substrate and the recording layer, for allowing the radiation beam to pass therethrough.
The adhesive layer adheres the recording layer to the substrate to prevent the recording layer from being peeled off therefrom.
The adhesive layer comprises a fluorine resin material, which can be formed by a known dry process formation, such as sputtering or plasma polymerization.
Using these film formation techniques, the adhesive layer can be uniformly disposed on the substrate with the pre-groove, so that the recess shape of the pre-groove can be well inherited (succeeded) to the adhesive layer to prevent the degradation of tracking control of the optical disk due to the formation of the adhesive layer.
The invention, and its objects and advantages, will become more apparent in the detailed description of preferred embodiments presented below.