Polishing disc for fine machining of optically active surfaces in eyeglass lenses

摘要

Polishing disc (10) for a tool (12) for fine machining of optically active surfaces (cc, cx) in glasses for glasses (L), with a base body (14) having a central axis (M), in which an intermediate layer (16) of an elastic material is fixed, softer compared to the base body (14), on which a support of polishing material (18) rests, characterized in that the intermediate layer (16) has at least two zones of different hardness, which are successively arranged in the direction of the central axis (M) and are configured by layers of foam material (20, 22) different from each other, where the layer of foam material (20) that borders the base body (14) is softer than the layer of foam material (22) on which the support of polishing material (18) rests, and the static E modulus, determined in the case, rises from a full surface compression, of the harder foam layer (22) to in between 0.40 and 1.50 N / mm2, while the static E modulus of the softer foam layer (20) is between 0.25 and 0.45 N / mm2.