Diffraction sheet and method for manufacturing the same, three-dimensional display device, light beam reproduction device, three-dimensional spatial display system, light beam reproduction method, and program

A method for manufacturing a diffraction sheet, comprising:

• forming a first uncured resin layer on a transparent substrate measuring 10 inches or more in diagonal;
• bringing a first diffraction pattern formed on a first surface of a first plate into contact with the first uncured resin layer, the first diffraction pattern being formed in a rectangular area measuring 10 inches or more in diagonal;
• placing a first mask having a plurality of first apertures formed based on a first array pattern on the first plate;
• irradiating the first mask with light to cure a portion of the first uncured resin layer that overlaps the first apertures;
• forming a second uncured resin layer on a surface of the transparent substrate on which the first uncured resin layer is formed;
• bringing a second diffraction pattern, which is different from the first diffraction pattern, formed on a first surface of a second plate into contact with the second uncured resin layer, the second diffraction pattern being formed in a rectangular area measuring 10 inches or more in diagonal;
• placing a second mask having a plurality of second apertures formed based on a second array pattern different from the first array pattern on the second plate;
• and
• irradiating the second mask with light to cure a portion of the second uncured resin layer that overlaps the second apertures, wherein
• the first uncured resin layer has a cured hardness of 0.5 MPa to 100 GPa at room temperature.