OPTICAL DATA RECORDING MEDIUM, MANUFACTURING METHOD THEREFOR AND METHOD FOR CLAMPING OPTICAL DATA RECORDING MEDIUM

• Main Authors: HAYASHI KAZUHIRO, OHNO EIJI, MOHRI MASANARI
• Format: Patent
• Language: English; Korean
• Published: 11.03.2004
• Edition: 7
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; PERFORMING OPERATIONS; PHYSICS; PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

PURPOSE: An optical data recording medium, a manufacturing method therefor and a method for clamping the optical data recording medium are provided to have surface protrusions for protecting a transparent protective layer and reducing a load on a motor during disc rotation and apply a higher disc clamping force to the optical data recording medium. CONSTITUTION: A disc-shaped optical data recording medium(110) has a signal recording layer(103) for reading and writing data using light and a transparent protective layer(102) with 10μm to 200μm thickness. The transparent protective layer(102) is disposed over the signal recording layer(103). The disc-shaped optical data recording medium(110) includes a protrusion(100). The protrusion(100) is projected from the surface of the transparent protective layer(102) on a light-incidence surface side to which light is emitted to the signal recording layer(103). The protrusion(100) is disposed in an area between a center hole(101) and a clamping area(CA) where the disc-shaped optical data recording medium(110) is held when reading and writing the data in the signal recording layer(103).