Techniques for forming burst cutting area mark

Abstract

A BCA mark is applied prior to molding of optical recording media. A stamper including a BCA code is formed. The stamper including the BCA code is used in the molding of optical recording discs. This technique can be used in manufacturing of read-only type discs, recordable discs, rewritable discs, hybrid discs, discs readable from both disc sides, discs having multiple information layers, high-density discs, etc.

1 . A method for applying a BCA mark prior to molding of optical recording media, said method comprising: 
 forming a stamper including a BCA code; and    using the stamper including the BCA code in the molding of optical recording discs.    
   
   
       2 . The method of  claim 1 , wherein the BCA code is applied to a mastering substrate, and the mastering substrate including the BCA code is used in a process for forming the stamper.  
   
   
       3 . The method of  claim 1 , wherein the BCA code is applied to a father, and the father including the BCA code is used in a process for forming the stamper.  
   
   
       4 . The method of  claim 1 , wherein the BCA code is applied to a mother, and the mother including the BCA code is used in a process for forming the stamper.  
   
   
       5 . The method of  claim 1 , wherein the stamper is formed and then the BCA code is applied to the stamper.  
   
   
       6 . The method of  claim 1 , wherein the BCA code is included in a disc image formed in premastering, the disc image including the BCA code is used to form a mastering substrate, and the mastering substrate including the BCA code is used in a process for forming the stamper.  
   
   
       7 . The method of  claim 1 , wherein the BCA code is applied to a mastering substrate after pits are formed in the mastering substrate, and the mastering substrate including the BCA code is used in a process for forming the stamper.  
   
   
       8 . A read-only type optical disc comprising a BCA mark in a burst cutting area of the disc, wherein the BCA mark is formed using the method of  claim 1 .  
   
   
       9 . A recordable optical disc comprising a BCA mark in a burst cutting area of the disc, wherein the BCA mark is formed using the method of  claim 1 .  
   
   
       10 . A rewritable optical disc comprising a BCA mark in a burst cutting area of the disc, wherein the BCA mark is formed using the method of  claim 1 .  
   
   
       11 . A hybrid optical disc comprising a BCA mark in a burst cutting area of the disc, wherein the BCA mark is formed using the method of  claim 1 .  
   
   
       12 . An optical disc readable from both sides and comprising a BCA mark in a burst cutting area of the disc, wherein the BCA mark is formed using the method of  claim 1 .  
   
   
       13 . An optical recording disc comprising a BCA mark in a burst cutting area of the disc, wherein said burst cutting area is in an annular region of the disc at an inner radius of 21.0(+0.3/−0)mm and outer radius of 22.2(+0/−0.2)mm, and 
 wherein the BCA mark is formed using the method of  claim 1 .    
   
   
       14 . An optical recording disc comprising a BCA mark in a burst cutting area of the disc, wherein said burst cutting area is in an annular region of the disc at an inner radius of 22.3(+0/−0.4)mm and an outer radius of 23.15(+0.05/−0.05)mm, and 
 wherein the BCA mark is formed using the method of  claim 1 .    
   
   
       15 . An optical recording disc comprising a BCA mark in a burst cutting area of the disc, wherein said burst cutting area is in an annular region of the disc at an inner radius of 22.3(+0/−0.4)mm and an outer radius of 23.50(+0.05/−0.05)mm, and 
 wherein the BCA mark is formed using the method of  claim 1 .    
   
   
       16 . An optical disc comprising: 
 an information carrying area and a burst cutting area; and    an embossed BCA mark formed at said burst cutting area.    
   
   
       17 . The optical disc of  claim 16 , wherein said embossed mark is formed while molding at least a part of said disc.  
   
   
       18 . The optical disc of  claim 16 , wherein said burst cutting area is in an annular region of the disc at an inner radius of 21.0(+0.3/−0)mm and outer radius of 22.2 (+0/−0.2)mm.  
   
   
       19 . The optical disc of  claim 16 , wherein said burst cutting area is in an annular region of the disc at an inner radius of 22.3(+0/−0.4)mm and an outer radius of 23.15(+0.05/−0.05)mm.  
   
   
       20 . The optical disc of  claim 16 , wherein said burst cutting area is in an annular region of the disc at an inner radius of 22.3(+0/−0.4)mm and an outer radius of 23.50(+0.05/−0.05)mm.