Polishing disc for a tool for fine processing of optically effective surfaces on spectacle lenses

  • US 10,569,387 B2
  • Filed: 09/16/2015
  • Issued: 02/25/2020
  • Est. Priority Date: 10/15/2014
  • Status: Active Grant
First Claim
Patent Images

1. A polishing disc for a tool for fine processing of optically effective curved surfaces on spectacle lenses, comprising a base body which has a center axis and a substantially symmetrical semi-spherical end surface about said center axis and to which is secured an intermediate layer of a resilient material, on which a polishing medium carrier rests, the intermediate layer being softer by comparison with the base body, characterized in that the intermediate layer has at least two regions of different hardness, which are arranged in succession in the direction of the center axis and which are formed by mutually different foam material layers, wherein the foam material layer adjoining the base body is softer than the foam material layer on which the polishing medium carrier rests, each layer having a substantially symmetrical semi-spherical surface about said center axis, and wherein, as determined for the case of whole-area compression, the static modulus of elasticity of the harder foam material layer is between 0.40 and 1.50 N/mm2, whereas the static modulus of elasticity of the softer foam material layer is between 0.25 and 0.45 N/mm2.

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