Patent ID: 7477463
Filing Date: 2009-01-13
Classification: B82Y,G11B

Abstract:
1. A master information carrier having on its surface a signal area where an embossed pattern formed by protruding portions and recessed portions and representing a signal pattern to be transferred has been formed, wherein the improvement comprises that the shortest bit length of the embossed pattern is 300 nm or shorter, and the embossed pattern is formed so that a total of areas of upper surfaces of the protruding portions of the embossed pattern is smaller than a total of areas of inter-protruding-portions in the signal area, wherein the signal area in which the embossed pattern has been formed and a non-signal area in which there is no embossed pattern are present on the surface of the master information carrier, an average height of the upper surfaces of the protruding portions of the embossed pattern is not smaller than 50 nm, and dispersion 3σ of heights of the upper surfaces of the protruding portions is not larger than 10 nm.