METHOD OF MANUFACTURING AN OPTICAL STORAGE MEDIUM AND OPTICAL STORAGE MEDIUM

摘要

A method of manufacturing an optical storage medium is provided, which comprises at least a transparent spacer layer ( 22 ) or transparent cover layer. This layer is provided by spincoating a liquid layer ( 22 ) between an inner radius ri and outer radius ro and substantial solidification by means of exposure to e.g. UV-radiation. The solidification of the liquid ( 22 ) is started at ri at a moment in time defined as t=ti. The solidification of the liquid ( 22 ) at ro takes place at a moment in time defined as t=to and to=ti+d and d>1 s. The solidification of the liquid ( 22 ) between ri and ro takes place at a moment in time between ti and to. The advantage is that the radial thickness uniformity of the solidified liquid ( 22 ) is substantially improved and better than +/-mum. Further an optical storage medium is provided manufactured using the method wherein additionally a stamper, preferably transparent to radiation, is pressed into an unsolidified top portion of the liquid layer ( 22 ) and solidified using a special device. In this way information is provided into the spacer layer ( 22 ) without disturbing the thickness uniformity of the spacer layer ( 22 ).