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AssigneeArtience Lab Inc.
InventorAkira SHIRAKURA
Estimating the term…
[Problem] Propagation of parallel light inside thin glass or plastic material had not been considered to be feasible because of difficulties in producing parallel light with large aspect ratio and in light-guiding it into thin material. For this reason, there had been a problem that holograms of edge-lit reproduction type were not being brought to practical use. [Means for Solution] A compact, simple collimator optics has been successfully made by placing a holographic diffraction grating close to a diverging light source to propagate it at the critical angle inside the medium. By making an array of this diffraction grating it has become possible to propagate parallel light of any aspect ratio inside a thin plate. Hitherto unrealized image display devices and signal devices have become possible by using the holographic diffraction gratings as described in the foregoing, or other diffraction optical elements, to introduce light from a plurality of light sources, in combination with edge-lit reproduction type image holograms.
-27. (canceled)
An optical deflection device wherein,
An optical deflection device wherein
An image reproduction method for viewing a hologram image by attaching, without interposition of an air gap, an edge-lit hologram produced by a separate process on to the face of a transparent medium of optical refractive index 1.3 or greater that is a cylinder or a partial cylinder with curvature, by illuminating with at least two light sources and holographic diffraction gratings or refractive optical functional elements facing each light source upon preventing illumination by light from adjacent light sources,
Dependencies are inferred from the claim text.