MASTER INFORMATION CARRIER AND METHOD FOR MANUFACTURING MAGNETIC DISK

摘要

PROBLEM TO BE SOLVED: To improve close contact between a magnetic disk and a master information carrier for transferring and recording preformat information signals to the magnetic disk by bringing it into close contact with the magnetic disk and applying a magnetic field. SOLUTION: The master information carrier 11 includes a high-level region 12 and a low-level region 13 that are formed on the surface of a non-magnetic base 20. The high-level region 12 includes a ferromagnetic thin film pattern 12p that corresponds to the preformat information signals. The master information carrier 11 is brought into close contact with the magnetic disk by exhausting a gas from the inner hole of the magnetic disk to generate negative pressure in a space between the low-level region 13 and the magnetic disk. In this case, to prevent deformation of the central portion of the master information carrier 11, an inner edge 12a of the high-level region 12 in the radial direction is extended to the vicinity of an inner hole edge 1a of the magnetic disk so that a portion of the high-level region 12 comes into contact with the vicinity of the inner hole edge 1a of the magnetic disk. COPYRIGHT: (C)2003,JPO