Patent ID: 7221640

Claim:
A method of manufacturing an optical storage medium, comprising a substrate and a plurality of layers deposited on the substrate, including at least one of a transparent spacer layer and transparent cover layer, which layer is provided by applying a liquid onto the rotating substrate and rotating the substrate further in order to spread out the liquid into a layer substantially uniformly between an inner radius r i and an outer radius r o , and substantially solidifying the liquid layer by means of exposure to radiation characterized in that: the solidification of the liquid layer at r i takes place at a moment in time defined as t=t i , the solidification of the liquid layer at r o takes place at a moment in time defined as t=t o and t o =t i +δ and δ>1 s, the solidification of the liquid layer between r i and r o takes place at a moment in time between t i and t o .