Lapping disc, which has a layer, the curvatures of optical surfaces can be adapted to lenses and a method for the fine machining of optical surfaces

摘要

In the case of an adaptable lapping disc (12) and an associated method for the fine machining of spectacle lenses (67) defines a rigid base (18) of the lapping disc a spectacle lens - nominal curvature, which corresponds to a predetermined area of curves. A working surface (22) is of the lapping disc by a thin, hard polymeric material is defined, which is connected to the base surface (18), in order to contact with a selected spectacle lens surface (67) and accordance with the curvature of the selected surface. A selectively adjustable substance (24), which consists of a mixture of thermoplastic and metallic particles, forms a layer which is disposed between the rigid base (18) and of the working surface (22), and is selectively between a fixed and a liquid can be changed. In its liquid form the modifiable substance (24) a - movement of the working surface (22), based on the base surface (18), in order to the curvatures of a plurality of spectacles glass curvatures within the predetermined range of curvatures, and to fixed in its solid shape of the substance (24) of the working surface (22) in a position corresponding to the curvature of a selected lens surface, and receives the corresponding position during the fine machining of the lens surface upright.