| 摘要 |
PURPOSE:To obtain the titled optical disk substrate having high heat resistance, impermeable to air and water, and having excellent durability by forming a tracking groove layer with a polysiloxane compd. prepared from a silicon compd. on the substrate for an optical disk. CONSTITUTION:A tracking groove layer 2 is formed on a substrate disk 2 of glass or plastics with a polysiloxane compd. obtained by heating a silicon compd. shown by the formula RnSi(OH)4-n, where R is H or alkyl and (n) is 3-1. The layer 2 has high heat resistance, and is impermeable to air and water. When an optical recording film is formed on the layer 2 by vapor deposition or sputtering, the layer is not deformed due to the heat generated in the formation, and the film is formed at high speed. The optical recording film is not deteriorated from the side of the substrate because of the impermeability of the substrate to air and water. Accordingly, a substrate for an optical disk having excellent durability is obtained. |
