Patent ID: 6962668
Filing Date: 2005-11-08
Classification: B29C

Abstract:
1. A method for producing a digital optical disk which has first and second sides, the method comprising: positioning first and second stampers, said first and second stampers defining first and second stamper planes, said positioning resulting in said first and second stamper planes being a first distance apart, said first stamper having first stamper marks at least partially out of said first stamper plane, said second stamper having second stamper marks at least partially out of said second stamper plane; injecting an initially fluid molding material between said first and second stampers, wherein said molding material substantially fills at least a region having a first diameter; wherein said molding material at least partially hardens to provide a first disk with a first side embossed with at least first disk marks corresponding to said first stamper marks and a second side embossed with at least second disk marks corresponding to said second stamper marks, said first and second embossed sides being produced substantially simultaneously; positioning said first and second stamper such that said first and second stamper planes are a second distance apart, greater than said first distance; removing said first disk from between said first and second stampers; determining a concentricity of said first and second sides of said first disk; based on said determination, re-positioning said first and second stampers; re-injecting an initially fluid molding material between said re-positioned first and second stampers, wherein said molding material substantially fills at least the region having a first diameter; wherein said re-injected molding material at least partially hardens to provide a second disk with a first side embossed with at least first disk marks corresponding to said first stamper marks and a second side embossed with at least second disk marks corresponding to said second stamper marks, said first and second embossed sides of said second disk being produced substantially simultaneously and having reduced concentricity compared to said first disk; and wherein said first disk marks are readable by providing light to said first side without said light first passing through said second side and wherein said second disk marks are readable by providing light to said second side without said light first passing through said first side.