Patent ID: 7641822
Filing Date: 2010-01-05
Classification: B82Y,G11B,Y10S

Abstract:
1. A method for producing a master information carrier equipped with a substrate having an irregular pattern corresponding to information to be transferred to high density slave media and a magnetic layer which is coated on the substrate, in which the track width is 0.3 μm or less, comprising: coating a disk with resist; drawing a pattern that corresponds to each recess or protrusion of the irregular pattern, by scanning an electron beam having a drawing diameter which is smaller than the track width a plurality of times along a single direction on the resist while rotating the disk; producing the substrate having the irregular pattern based on the drawing performed by the electron beam; and coating the substrate with the magnetic layer; wherein irradiation position of the electron beam is being shifted for each scanning operation among the plurality of scanning operations; and wherein the irradiation position is being shifted such that k is 0 or greater and 0.8 or less within a formula W=[n−(n−1)k]*d, wherein W is the track width in μm, n is the number of scanning operations, d is the drawing diameter of the electron beam in μm, and k is a coefficient that represents the degree of overlap of the electron beam.