Hologram record media, the hologram record reproducing arrangement, it possesses the record area where light condensing spot is formed

摘要

In order information optical (i) and reference beam (R) to interfere, light condensing spot (sp) the record area which is formed (Ba) it possesses by the fact that it is irradiated, light condensing spot (every sp) the hologram record medium where hologram is recorded (B) it is, the record area (Ba), as the diffraction grating (Dg) is formed, this diffraction grating (Dg), light condensing spot (sp) the plural deficiency regions which become aim goal (df) is provided.