Patent ID: 7193953
Filing Date: 2007-03-20
Classification: G11B

Abstract:
1. A holographic recording apparatus comprising: means for generating a reference beam and a signal beam; a mask for modulating the signal beam with data to generate a modulated signal beam; and a hologram medium for storing an interference pattern between the reference beam and the modulated signal beam, wherein the mask has a first and a second opaque film and a transparent plate inserted therebetween, the first and the second opaque film facing each other, the first and the second opaque film have a first and a second recording track group, respectively, and the first and the second recording track group have a plurality of first and second recording tracks, respectively, the first and the second recording tracks being alternately arranged, wherein the data to modulate the signal beam therewith are alternately embedded along the first and the second recording tracks such that one of two neighboring recording tracks is one of the first recording tracks and the other is one of the second recording tracks.