Gramophone record disc blanks - produced by galvano plastic copying of smooth glass surface onto lacquer layer carried by substrate or onto plastics cast

摘要

The lacquer layer is formed on a smooth surface of a substrate which is produced by galvano-plastic copying of a surface of a supercooled melt. The lacquer layer has a perfect, smooth surface (mirror-finish). Pref. the smooth surface is provided on the lacquer layer which is interposed between the melt and the substrate, whereby the layer may be provided with a release layer. Supercooled melt may be glass.