Manufacturing method of cover layer of optical information storage media

A manufacturing method of cover layer of optical information storage media is disclosed. A plate and a substrate having a signal structure or recording layer are provided, a polymer resin is applied on the substrate. The plate is made to come in contact with the radiation-setting resin and then the radiation-setting resin is compressed against the substrate. The resulting structure is placed on a rotatable table and the rotatable is rotated. A radiation-setting resin layer with a uniform thickness is formed. The radiation-setting resin layer is illuminated by a UV light to harden the radiation-setting resin layer. Next, the plate is separed from the radiation-setting resin layer while the radiation-setting resin layer remain adhered to the substrate. The hardened radiation-setting resin layer serves as a cover layer.