Patent ID: 8405892

Claim:
A method for manufacturing a hologram recording medium that has an arrangement by which different original images are reproduced when observed from different positions, the hologram recording medium manufacturing method comprising: an original image preparation step of preparing a plurality N of original images, each as a set of unit light sources positioned in a three-dimensional coordinate system; a recording plane setting step of setting a predetermined recording plane in the three-dimensional coordinate system; an observation region setting step of setting a plurality N of observation regions in the three-dimensional coordinate system; a pattern computation step of computing a complex amplitude pattern formed on the recording plane by synthesis of object light components emitted from individual unit light sources from the set of unit light sources constituting the respective original images; and a pattern forming step of forming the complex amplitude pattern on a physical medium; wherein one-to-one correspondences are made between said plurality N of original images and said plurality N of observation regions, respectively; and wherein in the pattern computation step, a plurality of computation points being defined on said recording plane, at each of computation point positions, a synthetic object light is obtained by synthesizing object lights, emitted from the individual unit light sources constituting said plurality N of original images, which reach said each of computation point positions to compute a complex amplitude of said synthetic object light, wherein computations that each takes into account only light components, which, among the object light components from the unit light sources belonging to an i-th (original image, reach an i-th observation region corresponding to said i-th original image, are performed, wherein i=1, 2, . . . , N.