Patent ID: 7897206

Claim:
A method of manufacturing an optical data storage medium to form at least one substrate having a plurality of layers deposited on the substrate, including at least one of a transparent spacer layer and a transparent cover layer, the method comprising acts of: applying a liquid onto the rotating substrate by 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 exposing the liquid layer to UV radiation to solidify the liquid layer; and heating the liquid layer by heating means in an area with a radius larger than the inner radius r i in such a way that the temperature rise of the liquid layer at r i has a value δT ri wherein while the temperature rise of the liquid layer between r i and r o gradually increases, the temperature rise of the liquid layer at r o has a value δT ro >δT ri , and wherein the temperature rise between r i and r o has a radial temperature profile with a shape substantially resembling the shape of a radial thickness profile resulting when δT ro and δT ri are zero.