Method and system for constructing a composite hologram
AssigneeEidetic Images, Inc.
InventorKenneth A. Haines
Life of this patent
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Abstract
Techniques for making individual narrow lenticular holograms for a composite drum shaped hologram wherein the vertical and horizontal aspects of an object beam and of an image therein are optically processed independently of each other. A very narrow lenticular hologram is made preferably having a width related to the horizontal resolution element size of the reconstruct image in order to minimize undesirable lines in the reconstructed image. The image is predistorted in the hologram construction step to account for a wavelength change if one exists between construction and reconstruction. A master drum hologram is constructed with ultraviolet light utilizing photoresist holographic detector material, in one specific embodiment.
Claims5
In the method of making a composite hologram of a large number of individual lenticular holograms, said holograms having narrow widths and a common height and joined together at their sides into a drum-like shape having a radius "R" and a center axis, wherein an apparent image of a three-dimensional object is reconstructed within said drum shape by illuminating the hologram from beneath by a white light source, said source having a maximum width "W" and positioned substantially on said center axis, the improvement wherein:
- the spacing of the adjacent lenticular hologram elements is made to be substantially within a range of .sqroot..lambda.R as an upper limit and .lambda.R/W as a lower limit, wherein ".lambda." is any wavelength of visible light, thereby to minimize the effect and visibility of undesirable vertical liens that exist superimposed over the image.
A composite hologram, comprising a plurality of elongated lenticular holograms, the width of each lenticular hologram being less than about one millimeter, each hologram overlapping an adjacent hologram by no more than 50% of its width.
Dependencies are inferred from the claim text.