Protective rim for storage discs

Details Protective rim for storage discs Protective rim for storage discs

G - Physics

11

B

352/32.4

G11B 7/24 (2006.01)

Patent

CA 1241744

13 ABSTRACT: A storage disc has a transparent substrate (21) on which a recording layer (22) has been deposited, which layer can be modified locally by means of a radiation beam and is covered with a cover disc, for example in the form of an identical second transparent substrate (23) which is spaced from the recording layer and secured to the first substrate by annular means (26, 27) so as to enclose a sealed space (24). Protective circumferential means (25) form part of the annular means (26) to protect the peripheries (29) and (214) of both substrates which are vulnerable to impact forces and thermal stresses. It is essential that spaces (212, 213) are formed between the substrate peripheries and the circumferential means in which no means are present which can transmit undesirably large forces in the case of deformation of the circumfer- ential means. Thus, all forces, or at least such a part of the forces that fracture of the substrates is prevented, are transmitted via the annular means to the flat sides of the substrates only. The circumferential means may be subjected locally to plastic deformation to absorb impact energy.

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