Patent ID: 8743443
Filing Date: 2014-06-03
Classification: B42D,G03H

Abstract:
1. A hologram fabrication method, characterized by comprising steps of fabricating a computer-generated hologram having amplitude information and phase information recorded by computer operation on a given recording surface, irradiating said computer-generated hologram with first reconstructing illumination light to generate first diffracted light from said computer-generated hologram thereby reconstructing a first reconstruction image, simultaneously entering said first diffracted light and first reference light in a first-stage hologram recording material faced away from said first reconstructed image to record a first-stage hologram in it, irradiating the recorded first-stage hologram with second reconstructing illumination light to generate second diffracted light from said first-stage hologram thereby reconstructing a second reconstruction image, and simultaneously entering said second diffracted light and second reference light in a second-stage hologram recording material located near said second reconstructed image to record a second-stage hologram in it as a reflection or transmission type volume hologram, wherein a computer-generated hologram recorded by use of object light that spreads out from a point light source set on a recording object in a given one-dimensional direction only is used as said computer-generated hologram, and when recording said first-stage hologram, diffusing illumination light that diffuses only in a direction orthogonal to said one-dimensional direction is used as said first reconstructing illumination light.