Optically readable information disk

Details Optically readable information disk Optically readable information disk

G - Physics

11

B

352/32.4

G11B 7/00 (2006.01) G03F 7/00 (2006.01) G11B 5/82 (2006.01) G11B 7/26 (2006.01)

Patent

CA 1182915

ABSTRACT: "Optically readable information disk." Optically readable information disc having a radiation cured lacquer layer comprising an optically readable information track whereby the lacquer layer has a minimum identation hardness which corresponds to a maximum depth of penetration of 5µm of a needle which is placed on the lacquer layer and which has a ball-shaped tip manufactured from a hard material and having a diame- ter of 18 ? 1 µm and presses on the layer with a weight of 2.5 ? 0.1 g.

387620

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