Patent ID: 6887593
Filing Date: 2005-05-03
Classification: B82Y,G11B,Y10T

Abstract:
1. A master information carrier for magnetic transfer comprising a substrate having an irregularity pattern representing information to be transferred to a slave medium and a magnetic layer formed on the irregularity pattern on the substrate, wherein the improvement comprises that formula −0.0004≦(t−d)/d≦0.1 is satisfied where d represents the depth of the recessed portions of the irregularity pattern and t represents the thickness of the magnetic layer formed on the recess portions, the magnetic layer formed on the protruding portions of the irregularity pattern and the magnetic layer formed on the recessed portions of the irregularity pattern are connected with each other; and wherein the formula 0.01δ/t≦0.5 is satisfied and wherein further, δ represents the thickness of the magnetic layer of the side wall connecting the magnetic layer on the protruding portions and the magnetic layer on the recessed portions.