Protected optical disc

A protected optical disc for the recording of information comprising:

• an optically transparent plate having a central hole and outer and inner surfaces;
• a layer of recording material deposited on said inner surface, said layer being inscribable and optically legible by reflection by a radiation beam traversing said transparent plate and being focused on said layer in a ring-shaped inscription region thereof;
• an intergral preshaped cover having a central hole of substantially the same diameter as the central hole of said optically transparent plate, a central ring-shaped contact surface immediately surrounding said central hole, and an edge ring-shaped contact surface the two contact surfaces being adapted to be in contact with said layer of preceding material deposited on said inner surface of said transparent plate with the central hole of the integral cover being aligned with the central hole of the transparent plate, the cover being shaped so as to include an inner annulus forming said central ring-shaped contact surface in contact with said inner surface of said transparent plate, an intermediate annulus, concentric with said inner region, not in contact with said inner surface of said transparent plate and an outer annulus forming said edge ring-shaped contact surface in contact with said inner surface of said transparent plate, an annular chamber being formed by the contact between said transparent plate and said preshaped cover at said two contact surfaces.