Techniques for forming burst cutting area mark
View Patent ↗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 data to a burst cutting area (BCA) prior to molding of optical recording media, said method comprising:
forming a stamper including BCA data thereon; and
using the stamper including the BCA data in the molding of optical recording discs to form optical recording discs including a BCA mark thereon,
wherein the BCA data is applied by a laser to one of a father or a mother,
where the stamper is formed using the mother, and the mother is formed using the father and the father is formed using a mastering substrate.
2. The method of claim 1 , wherein the BCA data is applied to the father, and the father including the BCA data is used in a process for forming the stamper.
3. The method of claim 1 , wherein the BCA data is applied to the mother, and the mother including the BCA data is used in a process for forming the stamper.
4. The method of claim 1 , further comprising the step of covering an information layer and the BCA mark of the optical recording discs with a reflective layer.
5. The method of claim 1 , wherein the BCA mark applied to the stamper has physical parameters that accommodate contrast and shrinkage in the molded optical recording discs.
6. The method of claim 1 , wherein the BCA data is applied by the laser in a non-continuous spiral mode that is timed with a pulse per revolution signal according to the BCA data.