Optically readable storage disc

Details Optically readable storage disc Optically readable storage disc

G - Physics

11

B

352/32.4

G11B 7/24 (2006.01)

Patent

CA 1241441

ABSTRACT: An interchangeable optically readable storage disc com- prises two flat transparent substrates (21, 23) which are secured to and spaced from each other by annular means (24; 25). The circumferences of the substrates are protected against damage by the use of circumferential means (27) which are also employed for balancing purposes, for example by securing balancing mass (28) to these means.

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