Method for producing a disk-shaped substrate and method for producing an optical disk

• Main Authors: HISADA KAZUYA, HAYASHI KAZUHIRO, OHNO EIJI
• Format: Patent
• Language: English
• Published: 05.09.2006
• Subjects: APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL; CHEMISTRY; COMPOSITIONS BASED THEREON; INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PHYSICS; PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL; SPRAYING OR ATOMISING IN GENERAL; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING

A method for producing a disk-shaped substrate 10 used for producing an optical disk includes: (a) forming a protective layer 12 a that is larger in area than the disk-shaped substrate 10 on a surface of a transparent plate 11 a; and (b) cutting a portion of the plate 11 a with the protective layer 12 a formed thereon other than an outer edge portion of the protective layer 12 a to form a disk shape. According to this producing method, a thin substrate can be prevented from being damaged by forming a protective layer. Furthermore, according to this producing method, a protective layer with a uniform thickness can be formed.