Method of manufacturing an optical Storage disk

Method of manufacturing a break resistant glass substrate for an optical storage disk comprising the steps:

• heating a plane glass substrate above its softening point, said substrate having exterior surfaces and interior volume;
• stamping a guide track relief into the softened glass substrate with a stamp whose temperature is lower than the temperature of the glass substrate;
• applying a high voltage between the heated glass substrate and the stamp, the substrate acting as the cathode;
• and
• cooling the stamp for quenching the exterior surfaces of the heated glass substrate and cooling the glass substrate below glass transformation temperature, a substantially parabolic temperature profile being maintained through the glass substrate, and the glass substrate being kept in contact with the cooled stamp.

Method of manufacturing a break resistant glass substrate for an optical storage disk comprising the steps:

• heating a plane glass substrate above its softening point, said substrate having exterior surfaces and interior volume;
• stamping a guide track relief into the softened glass substrate with a stamp having a stamp temperature which is lower than glass transformation temperature;
• and
• cooling the stamp for quenching the exterior surfaces of the heated glass substrate and cooling the glass substrate below glass transformation temperature, a substantially parabolic temperature profile being maintained through the glass substrate, and the glass substrate being kept in contact with the cooled stamping device, said cooling being achieved by the stamp having a chamber for a liquid entering and exiting the stamp.

Method of manufacturing a break resistant glass substrate for an optical storage disk comprising the steps:

• heating a plane glass substrate above its softening point, said substrate having exterior surfaces and interior volume;
• stamping a guide track relief into the softened glass substrate with a stamp whose temperature is lower than glass transformation temperature;
• applying a high voltage between the heated glass substrate and the stamp, the substrate acting as the cathode;
• and
• suddenly cooling the stamp for quenching the exterior surfaces of the heated glass substrate and cooling the glass substrate below glass transformation temperature, a substantially parabolic temperature profile being maintained through the glass substrate, and the glass substrate being kept in contact with the cooled stamp.