Protected optical disc
AssigneeThomson-CSF
InventorsJean-Claude Lehureau, Henriette Magna, Michel Thirouard
Life of this patent
Estimating the term…
Abstract
This disc has a layer of an inscribable and optically legible recording material deposited on a transparent plate traversed by the recording or reading beam and protected from the outside by a cover formed for example by a metal sheet, whose two surfaces are fixed to the layer so as to form a space in front of the latter.
Claims8
A protected optical disc for the recording of information comprising a transparent supporting plate and a further support said further support having central and edge ring shaped contact surfaces and therebetween a recess for forming with said supporting plate a chamber insulated from the outside, and supported by said supporting plate within said chamber facing said further support a metal layer inscribable and optically legible by reflection using a radiation beam traversing said supporting plate;
- the inner face of said further support being provided with an antioxidant deposit extending in said chamber for preventing oxidation of said metal layer.
A protected optical disc for the recording of information comprising:
- a transparent supporting plate;
- a stamped sheet of metal forming a further support and having an annular depression, a central hole and two ring shaped coaxial bearing areas bounding said annular depression, said depression facing said supporting plate and forming a chamber insulated from the outside;
- a structure on said plate and extending in said chamber, inscribable and optically legible by reflection using a radiation beam traversing said supporting plate;
- and
- an anti-oxidant deposit on said further support and within said chamber.
Dependencies are inferred from the claim text.