Patent ID: 7244532
Filing Date: 2007-07-17
Classification: G11B

Abstract:
1. A holographic recording medium comprising a holographic recording carrier in which data can be holographically recorded, a first inorganic antireflection film formed on one surface of the holographic recording carrier and a second inorganic antireflection film formed on the other surface of the holographic recording carrier, optical characteristics of the first inorganic antireflection film and those of the second inorganic antireflection film being different from each other, wherein the holographic recording carrier includes a first light transmittable substrate, a second light transmittable substrate and a holographic recording layer sandwiched therebetween, and wherein the holographic recording carrier is constituted so that data can be recorded therein and data can be reproduced therefrom by projecting a first laser beam, and a concavo-convex pattern is formed on the second light transmittable substrate and covered by the second inorganic antireflection film so that the first laser beam can be positioned and an address of a region in which data are being recorded or from which data are being reproduced by projecting a second laser beam onto the concavo-convex pattern.